2018 CAMA Annual Report

526 South Church St.
DUKE
Charlotte, NC 28202
Mailing Address
ENEM.7r)
P.O.Box1006
Mail Code EC 13K.
IVEC
Charlotte, NC 28201-1006
980-373-5697
April 30, 2019
North Carolina Department of Environmental Quality
Division of Water Resources
Attn: Ms. Brandy Costner
Mooresville Regional Office
610 East Center Avenue, Suite 301
Mooresville, NC 28115
Attn: Ms. Brandy Costner (submitted electronically via FTP)
Re: 2018 Marshall CAMA Annual Report
Mooresville Regional Office
610 East Center Avenue, Suite 301
Mooresville, NC 28115
Dear Ms. Costner:
Enclosed you will find the 2018 CAMA Annual Report prepared by SynTerra Corporation for the Duke
Energy Marshall Steam Station. This Annual Report documents the information required by the
Department of Environmental Quality per the letter dated May 1, 2017.
If you have any questions or need any clarification regarding the information provided, feel free to contact
me at Tyler. [e-mail] or at 980-373-5697 at your convenience.
Respectfully submitted,
'6. j
'�� -PW�V�
Tyler Hardin
Duke Energy, Environmental Services
cc (via email): Mr. Eric Smith and Steve Lanter — DEQ Central Office
Ms. Elizabeth Werner - DEQ
Mr. Ed Sullivan - Duke Energy
Mr. Scott Davies — Duke Energy
Mr. Brian Wilker— SynTerra

2018 LAMA ANNUAL INTERIM
MONITORING REPORT
FOR
MARSHALL STEAM STATION
8320 EAST CAROLINA HIGHWAY 150
TERRELL� NC 28682
APRIL 3o, 2019
PREPARED FOR:
DUKE ENERGY CAROLINAS, LLC
DUKE
ENERGY,
PREPARED BY:
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synTerra
W W W. SYNTERRACORP. COM

2018 CAMA ANNUAL
INTERIM MONITORING REPORT
FOR
MARSHALL STEAM STATION
8320 EAST CAROLINA HIGHWAY 150
TERRELL, NC 28682
APRIL 30, 2019
PREPARED FOR
DUKE ENERGY CAROLINAS, LLC
('DUKE
ENERGY.
PREPARED BY
SYNTERRA CORPORATION
100
synTerra

2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
EXECUTIVE SUMMARY
ES.1 Introduction
This annual report evaluates the results of groundwater monitoring performed on a
quarterly basis during the 2018 calendar year at the Marshall Steam Station (MSS or
Site). The Site is a coal-fired electricity -generating facility owned and operated by Duke
Energy located near the town of Terrell, in Catawba County, North Carolina.
Monitoring was performed in accordance with the requirements of the Coal Ash
Management Act (CAMA) of 2014 (15A NCAC 13B .2001), in correspondence with the
North Carolina Department of Environmental Quality (NCDEQ), and based on the
Interim Monitoring Plan (IMP) developed for the Site.
A generalized Conceptual Site Model (CSM) of the Site was previously developed. The
ash basin was constructed within a former perennial stream valley, similar to other
Duke Energy facilities in the Piedmont of North Carolina. The following components of
the hydrogeologic setting limit constituent of interest (COI) transport in groundwater:
• Topographic ridges and associated groundwater divides of the Piedmont stream
valley setting inhibit lateral flow from the basin.
• Naturally occurring upward vertical groundwater gradients within former
perennial stream channels inhibit downward migration of COIs under the ash
basin with few exceptions.
• Neutral hydraulic gradients within impounded ash promote horizontal flow
within the ash basin.
• The hydraulic pressure of ponded water in the ash basin drives seepage flow of
groundwater under the ash basin dam.
• Beyond the dam, groundwater flows upward toward Lake Norman, limiting
downward migration of COIs to the area in close proximity to the dam with few
exceptions.
The distribution and concentration of COIs in groundwater within the shallow, deep,
and bedrock flow zones are discussed and evaluated with respect to historical Site
conditions. Changes to Site conditions during 2018 that may influence groundwater
flow or quality are also documented and discussed.
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
ES.2 Key Findings
Key findings of data from the 2018 CAMA monitoring include:
• The Photovoltaic (PV) structural fill, unlined structural fill beneath Industrial
Landfill No. 1, Dry Ash Landfill Phase I and II (Solid Waste Permit No. 1804) and
the access road structural fill are considered additional sources of coal
combustion residuals (CCR)-related COIs in groundwater that contribute to
same flow system as the ash basin.
• The current distribution of COIs at the MSS is contained within the Site.
• No imminent hazards to public health and safety have been identified.
• Groundwater flow direction is consistent with the slope -aquifer system model
common to the Piedmont Physiographic Province and is away from potential
water supply receptors located upgradient of the Site.
• The ash basin is a flow -through system with upward hydraulic gradients into the
former stream valleys at the upgradient ends of the basin. Hydraulic gradients
are predominantly horizontal across most of the basin. Hydraulic gradients are
downward in the vicinity of the ash basin dam due to the hydraulic head in the
basin near the dam. Upward vertical gradients are present downstream of the
dam in the vicinity of receiving water bodies (groundwater discharge areas). The
flow -through system limits downward vertical migration of COIs into
groundwater to the areas in close proximity to the dams with few exceptions.
• Boron is a key indicator of plume characteristics associated with the ash basin.
Additional COIs identified as having concentrations greater than their respective
standards are generally confined within the extent of the boron plume at the Site.
• Additional assessment of the shallow flow zone below the basin was completed
after submittal of the 2018 Comprehensive Site Assessment (CSA) Update.
Additional shallow groundwater monitoring wells have been installed beneath
the basin and sampled in 2018. The results indicate limited vertical migration of
COIs under the basin except in areas near the dam where downward vertical
gradients are observed and limited areas downgradient from the Dry Ash
Landfill (Phase II) and PV structural fill.
• Bedrock groundwater exhibits CCR-related effects primarily in areas with a
downward vertical hydraulic gradient. The effects are primarily observed near
the northern portion of the ash basin dam, beneath and downgradient of the Dry
Ash Landfill (Phase II) and a limited area downgradient of the PV structural fill.
Page ES-2

2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
• Deep bedrock wells have been installed in various areas across the Site to further
delineate the vertical extent of COIs in fractured bedrock and to characterize the
bedrock flow zone.
• Based on review and comparison with historical Site data, no significant changes
in the known COI plume were observed during evaluation of the 2018 CAMA
data.
ES.3 Interim Monitoring Plan Updates
Duke Energy submitted an optimized IMP to NCDEQ on March 20, 2019, which was
approved on April 4, 2019. The plan recommends adjusting the well and water quality
parameter lists to more efficiently monitor groundwater conditions at the Site. The
optimized 2019 IMP is designed to provide data associated with changes to the Site
groundwater occurrence, flow and quality as remedial efforts (e.g., ash basin decanting,
closure) are phased in.
Please note that the list of Site -specific COIs for inclusion into the CAP is currently
undergoing review using the COI management approach presented to the NCDEQ on
March 15, 2019. COIs proposed for management under the CAP would be based on:
• Comparing constituent concentrations to regulatory standards and/or
background values
• Evaluating each constituent's relative mobility
• Reviewing constituent distribution in groundwater based on geochemical
conditions
• Comparing each constituent's relative concentration observed in ash pore water
to the concentration observed in groundwater
• Evaluating constituent concentration trends over time
The results of this review will be presented in the CAP and may result in proposed
modifications to the monitoring program at that time.
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
TABLE OF CONTENTS
SECTION
PAGE
EXECUTIVE SUMMARY.................................................................................................... ES-1
ES.1 Introduction............................................................................................................ ES-1
ES.2 Key Findings........................................................................................................... ES-2
ES.3 Interim Monitoring Plan Updates....................................................................... ES-3
1.0 INTRODUCTION.........................................................................................................1-1
1.1
Objectives and Purpose............................................................................................1-1
1.2
Site Overview and History......................................................................................1-2
1.3
Changing Site Conditions........................................................................................1-3
1.4
Regional Hydrogeology...........................................................................................1-4
1.5
Site Hydrogeology....................................................................................................1-4
1.6
Previous Reporting...................................................................................................1-6
1.7
Overview of Findings for 2018................................................................................1-7
2.0
2018 MONITORING ACTIVITIES...........................................................................
2-1
2.1
2018 Quarterly Sampling Schedule........................................................................
2-1
2.2
Changes to the CAMA Groundwater Monitoring Network ..............................
2-1
2.3
Water Level Measurements.....................................................................................2-3
2.4
Groundwater Sampling Methods...........................................................................
2-3
2.5
Laboratory Analyses.................................................................................................
2-4
2.6
Quality Control Summary (Data Validation).......................................................2-4
3.0
2018 MONITORING RESULTS.................................................................................3-1
3.1 Site -Wide Groundwater Occurrence and Flow .................................................... 3-1
3.1.1 Horizontal Gradients..........................................................................................3-3
3.1.2 Vertical Gradients............................................................................................... 3-3
3.1.3 Groundwater Seepage Velocity........................................................................ 3-5
3.2 Data Reduction and Evaluation..............................................................................3-6
3.3 Ash Basin Water Quality........................................................................................3-11
3.3.1 Site Conditions.................................................................................................. 3-11
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
TABLE OF CONTENTS (CONTINUED)
SECTION
PAGE
3.3.2 Constituent Occurrence and Plume Status ...................................................
3-11
3.4 Dry Ash Landfill (Phase II) Water Quality..........................................................
3-16
3.4.1 Site Conditions..................................................................................................
3-16
3.4.2 Constituent Occurrence and Plume Status ...................................................
3-16
3.5 Dry Ash Landfill (Phase I) Water Quality...........................................................3-18
3.5.1 Site Conditions..................................................................................................
3-18
3.5.2 Constituent Occurrence and Plume Status ...................................................
3-19
3.6 Photovoltaic Farm Structural Fill Water Quality ...............................................
3-20
3.6.1 Site Conditions..................................................................................................
3-20
3.6.2 Constituent Occurrence and Plume Status ...................................................
3-20
3.7 Unlined Structural Fill beneath Industrial Landfill No. 1 Water Quality.......
3-22
3.7.1 Site Conditions..................................................................................................
3-22
3.7.2 Constituent Occurrence and Plume Status ...................................................
3-22
3.8 Access Road Structural Fill....................................................................................
3-23
3.8.1 Site Conditions..................................................................................................
3-23
3.8.2 Constituent Occurrence and Plume Status ...................................................
3-23
4.0 SUMMARY AND CONCLUSIONS.........................................................................4-1
4.1 Groundwater Occurrence and Flow......................................................................4-1
4.2 Groundwater Quality...............................................................................................
4-1
5.0 INTERIM MONITORING PLAN UPDATES.........................................................
5-1
5.1 Optimization of the Monitoring Program.............................................................5-1
5.2 2019 Monitoring and Reporting Schedule.............................................................5-2
6.0 REFERENCES................................................................................................................
6-1
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
LIST OF FIGURES
Figure 1-1
Site Location Map
Figure 1-2
Site Map with Monitoring Well Locations
Figure 3-1
Water Level Map - Shallow Flow Zone (November 6, 2018)
Figure 3-2
Water Level Map - Deep Flow Zone (November 6, 2018)
Figure 3-3
Water Level Map - Bedrock Flow Zone (November 6, 2018)
Figure 3-4
Hydrographs
Figure 3-5
Flow Velocity Vectors and Magnitudes - Shallow Flow Zone
Figure 3-6
Flow Velocity Vectors and Magnitudes - Deep Flow Zone
Figure 3-7
Flow Velocity Vectors and Magnitudes - Bedrock Flow Zone
Figure 3-8
Flow Velocity Vectors and Magnitudes through Dam
Figure 3-9
General Cross Section A -A'
Figure 3-10
General Cross Section B-B'
Figure 3-11
General Cross Section C-C'
Figure 3-12
Isoconcentration Map - Geomean of Boron in Shallow Flow Zone
Figure 3-13
Isoconcentration Map - Geomean of Boron in Deep Flow Zone
Figure 3-14
Isoconcentration Map - Geomean of Boron in Bedrock Flow Zone
Figure 3-15
Time Series Plots - Ash Basin (1)
Figure 3-16
Time Series Plots - Ash Basin (2)
Figure 3-17
Time Series Plots - Ash Basin (3)
Figure 3-18
Time Series Plots - Ash Basin (4)
Figure 3-19
Time Series Plots - Dry Ash Landfill Phase II (1)
Figure 3-20
Time Series Plots - Dry Ash Landfill Phase II (2)
Figure 3-21
Time Series Plots - Dry Ash Landfill Phase I
Figure 3-22
Time Series Plots - PV Structural Fill
LIST OF TABLES
Table 1-1
Monitoring Well Construction Information
Table 2-1
2018 CAMA Water Elevations
Table 3-1
Horizontal Hydraulic Gradients and Flow Velocities
Table 3-2
Vertical Hydraulic Gradients
Table 3-3
2018 Comprehensive Groundwater Quality Data
Table 3-4
Data Qualifiers and Acronyms
Table 3-5
Geometric Mean of COIs - 2018 Quarterly Data
Table 3-6 Constituents of Interest Evaluation
Table 3-7 Groundwater Background Threshold Values and Regional Background
Concentration Ranges
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
LIST OF APPENDICES
Appendix A Correspondence with NCDEQ
Appendix B Field Data and Forms
• Groundwater Sampling Forms
• Water Level Measurements
• Well Abandonment Records
• Well/boring Logs
Appendix C Approved Low Flow Sampling Plan
Appendix D Laboratory Analytical Data (Laboratory Reports)
and Data Validation Checklists
• Quarter 1-2018
• Quarter 2-2018
• Quarter 3-2018
• Quarter 4-2018
Appendix E Optimized Interim Monitoring Plans for 2019
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
LIST OF ACRONYMS
02B
NCAC Title 15A, Subchapter 02B. Surface Water and Wetland
Standards
02L
NCAC Title 15A, Subchapter 02L. Groundwater Classification and
Standards
AB
Ash Basin
BTV
Background Threshold Value
bgs
below ground surface
BR
Bedrock
°C
Degrees Celsius
CAMA
Coal Ash Management Act
CAP
Corrective Action Plan
CCR
Coal Combustion Residuals
CFR
Code of Federal Regulations
COI
Constituent of Interest
COC
Chain of Custody
CSA
Comprehensive Site Assessment
CSM
Conceptual Site Model
dh/dl
horizontal hydraulic gradient
DQO
Data Quality Objective
Duke Energy
Duke Energy Carolinas, LLC
DWQ
Division of Water Quality
EMP
Effectiveness Monitoring Program
FGD
Flue Gas Desulfurization
ft
Feet
i
Hydraulic gradient
ILF
Industrial Landfill
IMAC
Interim Maximum Allowable Concentration
IMP
Interim Monitoring Plan
k
Horizontal hydraulic conductivity
LLC
Limited Liability Company
MARLAP
Multi -Agency Radiological Laboratory Analytical Protocols
µg/L
micrograms per liter
mg/L
milligrams per liter
mm
millimeter
MSS
Marshall Steam Station
NCAC
North Carolina Administrative Code
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
LIST OF ACRONYMS (CONTINUED)
NCDENR North Carolina Department of Environment and Natural Resources
NCDEQ
North Carolina Department of Environmental Quality
ne
Effective porosity
NTU
Nephelometric Turbidity Units
Plant/Site
Marshall Steam Station
PBTV
Provisional Background Threshold Value
PV
Photovoltaic
TDS
Total Dissolved Solids
US
United States
USEPA
United States Environmental Protection Agency
Vs
Seepage flow velocity
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
1.0 INTRODUCTION
1.1 Objectives and Purpose
The purpose of this report is to evaluate the data from the 2018 Interim Monitoring Plan
(IMP) at the Marshall Steam Station (MSS or Site). The objective of the 2018 IMP was to
perform groundwater monitoring to meet the requirements of the Coal Ash
Management Act (CAMA) of 2014 (15A NCAC 13B .2001). Quarterly sampling was
performed on wells designated as part of the IMP in accordance with correspondence
from the North Carolina Department of Environmental Quality (NCDEQ), dated May 1,
2017, April 6, 2018, June 29, 2018, and September 28, 2018 (Appendix A).
An Effectiveness Monitoring Program (EMP) is required by CAMA §130A-309.209
(b)(1)e. The EMP for the MSS is anticipated to begin once basin closure and
groundwater Corrective Action Plan (CAP) have been implemented. In the interim, an
IMP has been developed at the direction of NCDEQ.
This report is prepared in accordance with NCDEQ's Division of Water Resources 2017
guidance document for the investigation of soil and groundwater contamination
(NCDEQ, 2017). Data were evaluated for groundwater quality, occurrence, and flow at
the Site. Constituents of interest (COIs) are those parameters with concentrations in
groundwater greater than one or more of the groundwater screening criteria; (NCAC
02L Groundwater Standard [02L standard], Interim Maximum Allowable Concentration
[IMAC], or approved background threshold value [BTV]).
The distribution and concentration of COIs in groundwater within the shallow, deep,
and bedrock flow zones are discussed and evaluated with respect to historical Site
conditions. Changes to Site conditions that occurred during 2018 that may affect
groundwater conditions at the Site are also documented and discussed.
Geometric means (geomeans) were calculated to support the analysis of groundwater
conditions and to provide a basis for defining the extent of the affected groundwater
plume in 2018. The geomean method was selected in order to capture the central
tendency of the data, which may vary over several orders of magnitude. Reported
geomeans were calculated using the four quarters of IMP data from 2018. A single
sample result may not be an accurate representation of the concentrations observed
over four quarters of data in 2018. Evaluating plume geometries with geomean data
minimizes the potential for incorporating occasions when COIs are reported at
concentrations outside of the typical concentration range, and potentially greater than
enforceable groundwater standards. Previous site assessments may have over-
represented areas impacted by the ash basin by posting a single data set on maps and
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
cross -sections that may have included isolated data anomalies. Rationale and
procedures for calculating geomeans are discussed in greater detail in Section 3.2.
1.2 Site Overview and History
The MSS is a four -unit coal-fired electricity -generating facility located on the west bank
of Lake Norman near the town of Terrell, Catawba County, North Carolina. The entire
Site, approximately 1,446 acres in area, is owned by Duke Energy. The Site is thought to
have been largely undeveloped prior to Duke Energy ownership.
Coal is delivered to the station by a railroad line. Operation of Unit 1 began in 1965, and
operation of Unit 2 began in 1966, with each generating 350 megawatts. Operation of
Unit 3 began in 1969, and operation of Unit 4 began in 1970, with each generating 648
megawatts. Improvements to the MSS since 1970 have increased the total electric
generating capacity to 2,090 megawatts.
The MSS ash basin, which contains ash generated from the historic and active coal
combustion at the Site, is situated with the steam station to the south, topographic
divides located along Sherrills Ford Road to the west, Island Point Road to the north,
and Duke Energy property and Lake Norman to the east (Figure 1-1). The ash basin,
approximately 394 acres in size, was constructed with an earthen dike. A 500-foot
compliance boundary encircles the ash basin and is generally co -located with the
property boundary on the western edge of the Site and Lake Norman shoreline on the
east. Fly ash and bottom ash from MSS were managed in the ash basin from
approximately 1965 until 1984. Fly ash precipitated from flue gas and bottom ash
collected in the bottom of the boilers was sluiced to the ash basin using conveyance
water drawn from Lake Norman. Since 1984, fly ash has been disposed of in the on -Site
landfills, and the sluicing of bottom ash to the ash basin continued until October 2018.
All process wastewater flows to the ash basin ceased on April 10, 2019.
Several additional coal combustion residual (CCR) source areas coincident with the ash
basin include:
• Photovoltaic (PV) Structural Fill - This structural fill was constructed of fly ash,
under the structural fill rules found in 15A North Carolina Administrative Code
(NCAC)13B .1700 et seq., and bottom ash, under Duke Energy's Distribution of
Residuals Solids Permit issued by the North Carolina Department of
Environment and Natural Resources (NCDENR) Division of Water Quality
(DWQ). The PV structural fill is located adjacent to, and partially on top of, the
northwest portion of the ash basin. The PV structural fill is unlined and was
completed and closed with a soil cover system in February 2013.
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
• Unlined structural fill beneath Industrial Landfill No. 1- This structural fill was
constructed under the same regulations as the PV structural fill as a foundation
for the double -lined Industrial Landfill No. 1 (ILF, Solid Waste Permit No. 1812-
INDUS-2008-), which is located north of the ash basin.
• Dry Ash Landfill Phase I and II (Solid Waste Permit No. 1804) - These unlined
dry ash landfills are closed. Phase I is located adjacent to the eastern portion of
the ash basin. Phase II is located partially on top of a northern portion of the ash
basin.
• Access Road Structural Fill - This structural fill access road was constructed of
fly ash, under the structural fill rules found in 15A NCAC 13B .1700 et seq. The
access road structural fill is unlined, contains approximately 128,000 cubic yards
of fly ash and coincides with a portion of the western ash basin waste boundary.
These source areas are discussed in this report to the degree that available data will
allow. Additional work to address potential influences from these sources is currently
underway, and results are to be presented in future reporting. Potential influence from
these source areas is considered coincident with the impacts from the ash basin.
Two potential additional source areas coincident with the ash basin have also been
identified by NCDEQ. Those areas include the coal pile located adjacent to the ash
basin and the gypsum pad located southeast of the ash basin. These additional sources
are not regulated under CAMA, however potential effects are considered coincident
with the ash basin. Therefore, assessment and characterization of each will be
incorporated into a CAP to be submitted at a later date.
1.3 Changing Site Conditions
Several changes to Site operations and conditions occurred in 2018 or are scheduled to
occur in 2019 that may influence groundwater occurrence, flow or quality.
The following are Site activities that may result in changes to groundwater occurrence,
flow and quality:
• Duke Energy converted to dry handling of bottom ash in October 2018. Bottom
ash is no longer sluiced to the MSS ash basin. This action is anticipated to have a
significant effect on Site conditions.
• All other process wastewater flows to the ash basin ceased on April 10, 2019, and
are now routed to a lined retention basin.
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
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• Without the operating hydraulic head at the dam, the mounding effect currently
observed in the MSS ash basin will be reduced and the vertical gradients near the
dam are expected to decrease.
• Activities associated with the Water Redirect Program, including:
o Regrading and construction activities in the area south of the Industrial
Landfill (ILF) No. 1 may be attributable to a decrease in water level of
approximately 15 feet in MW-41) during the fourth quarter 2018 when
compared with earlier 2018 events. The water levels in MW-4 also
decreased to below the dedicated pump and could not be recorded in the
fourth quarter of 2018.
o Dewatering two fingers of ponded water within the southwest portion of
the ash basin. Water elevations will continue to be monitored to assess
potential influence of construction and dewatering activities associated
with the Water Redirect Program in this area.
• Decanting of the MSS ash basin is required to begin by September 30, 2019.
1.4 Regional Hydrogeology
The Site is located in the Piedmont Physiographic Province. A conceptual model of
groundwater flow in the Piedmont, which is applicable to the Site, was developed by
LeGrand (1988, 1989) and Daniel and Harned (1992). The model describes a regolith
and bedrock drainage basin with a perennial stream valley system. Groundwater is
recharged by drainage in the highlands followed by discharge to the perennial stream.
Flow in the regolith follows porous media principals, while flow in bedrock is provided
by the presence of secondary porosity features (fractures). Rarely does groundwater
move beneath a perennial stream to another more distant stream or across drainage
divides (LeGrand, 1989).
1.5 Site Hydrogeology
The groundwater regime beneath the Site is consistent with the regolith-fractured
bedrock slope -aquifer system of LeGrand (2004). The soil/saprolite regolith and the
underlying fractured bedrock represent a composite water -table aquifer system. Three
hydrostratigraphic units were identified at the Site:
• Shallow/Surficial Zone - Composed of regolith (including residual soils, fill and
reworked soils, alluvium, and saprolite).
• Deep/Transition Zone - A relatively transmissive zone comprised mostly of
partially weathered rock that is gradational between saprolite and competent
bedrock.
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
• Bedrock Zone — Fractured competent bedrock. As described in the 2018
Comprehensive Site Assessment (CSA) update, groundwater flow in bedrock
fractures is anisotropic and difficult to predict, and velocities change as
groundwater moves between fractures of varying orientations, gradients, and
size (SynTerra 2018a).
Groundwater at the Site generally flows from northwest to southeast toward Lake
Norman. The topographically controlled flow direction provides natural hydraulic
control of potential CCR constituent migration within the former stream valley system.
The ash basin is a flow -through system with groundwater discharging upward into the
upgradient portions of the former perennial stream valleys. Hydraulic gradients are
predominantly horizontal across the central portions of the basin, and downward in the
vicinity of the ash basin dam. The migration of basin water to the underlying
groundwater near the dam is the primary mechanism for constituent transport from the
ash basin. Downstream of the dam, hydraulic gradients are upward toward
groundwater discharge zones (i.e., Lake Norman). This flow system results in limited
downward vertical migration of COIs into the groundwater beneath the ash basin.
The following presents a generalized conceptual site model (CSM) for the MSS ash
basin, which was constructed within former perennial stream valleys in the Piedmont of
North Carolina:
• Generally, the physical setting for ash basins within perennial stream valleys
limits the horizontal and vertical migration of constituents to areas near and
directly downstream of the basin dams and dikes.
• The groundwater flowpaths (the area of potential constituent migration in
groundwater from the basin) remain in the basin's stream valley system.
• Topographic ridges located in areas upgradient and sidegradient of the basin
reflect groundwater divides.
• Streams, rivers and lakes downgradient from the dams are groundwater
discharge zones that limit the horizontal migration of constituents downgradient
of the basin.
• Boron is the CCR constituent most indicative of groundwater migration from a
source area with a discernable plume pattern. Other less mobile metals such as
arsenic, chromium, cobalt, and selenium (if detected in groundwater) may be
present within the area of the boron plume but to a lesser extent.
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
• Due to the limited presence of most metals in groundwater, the groundwater
migration to downgradient surface water bodies has not caused exceedances of
surface water quality standards.
Exceptions to the typical groundwater flow pathway described in the CSM, as
described above, occur:
• When relatively thin topographic features (i.e., narrow groundwater divides) are
located adjacent to an ash basin, the hydraulic head within the basin provides a
mechanism for constituent migration toward an adjacent drainage valley; and
• In areas where additional source areas (e.g., landfills and ash storage areas)
contribute to the groundwater system.
These exceptions occur at the MSS in the vicinity of the Dry Ash Landfill Phase I,
located adjacent to the ash basin pond, and at other landfill and structural fill areas
located upgradient of the ash basin.
Wells have been installed in the shallow, deep, and bedrock flow zones as part of the
on -going assessment and groundwater monitoring activities. Figure 1-2 illustrates the
locations of the CAMA monitoring well network with respect to the ash basin and other
pertinent Site infrastructure (e.g., monitoring wells associated with other programs,
upgradient water supply well locations). Table 1-1 is a well construction table that lists
CAMA monitoring wells included in the 2018 IMP.
1.6 Previous Reporting
Detailed descriptions of the Site operational history, the Site conceptual model, physical
setting and features, geology/hydrogeology, and results of the findings of the CSA and
other CAMA-related work are documented in the following:
• Comprehensive Site Assessment Report — Marshall Steam Station Ash Basin (HDR,
2015a)
• Corrective Action Plan Part 1 — Marshall Steam Station Ash Basin (HDR, 2015b)
• Corrective Action Plan Part 2 (included CSA Supplement 1 as Appendix A) —
Marshall Steam Station Ash Basin (HDR, 2016a)
• Comprehensive Site Assessment Supplement 2 — Marshall Steam Station Ash Basin
(HDR, 2016b).
• Comprehensive Site Assessment Update — Marshall Steam Station (SynTerra, 2018a).
• Ash Basin Pumping Tests Report —Marshall Steam Station (SynTerra, 2019a)
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
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• Surface Water Evaluation to Assess 15A NCAC 02B.0200 Compliance for
Implementation of Corrective Action Under 15A NCAC 02L.0106 (k) and (l) (SynTerra,
2019b)
NCDEQ provided approval of background threshold values in a letter to Duke Energy
dated June 15, 2018 (Appendix A). Comparisons of data to BTVs in this report are in
reference to those approved values. BTVs will be further refined and updated in 2019.
In a letter dated August 17, 2018, NCDEQ indicated that assessment activities have been
sufficient to proceed with preparing a CAP, but requested additional investigation (i.e.,
characterizing shallow flow layer beneath the ash basin) be conducted in conjunction
with preparation of a CAP. Assessment activities associated with additional
investigations conducted in 2018 are described herein.
This report provides an evaluation of the groundwater data collected during the 2018
calendar year. The following sections present the 2018 CAMA monitoring data and
provide an integrated interpretation of Site conditions and plume status.
1.7 Overview of Findings for 2018
Key findings of the quarterly CAMA data for 2018 include:
• The Photovoltaic (PV) structural fill, unlined structural fill beneath Industrial
Landfill No. 1, Dry Ash Landfill Phase I and II (Solid Waste Permit No. 1804) and
the structural fill access road are considered additional sources of CCR-related
COIs in groundwater that contribute to the same flow system as the ash basin.
• No imminent hazards to public health and safety have been identified.
• Groundwater flow direction is consistent with the slope -aquifer system model
common to the Piedmont Physiographic Province and is away from potential
water supply receptors located upgradient of the Site.
• The ash basin is a flow -through system with upward hydraulic gradients into the
former stream valleys at upgradient ends of the basin. Hydraulic gradients are
predominantly horizontal across most of the basin. Hydraulic gradients are
downward in the vicinity of the ash basin dam due to the hydraulic head in the
basin near the dam. Upward vertical gradients are present downstream of the
dam in the vicinity of receiving water bodies (groundwater discharge areas). The
flow -through system limits downward vertical migration of COIs into
groundwater to the areas in close proximity to the dams with few exceptions.
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• Additional assessment shallow flow zone below the basin was identified after
submittal of the 2018 CSA Update. Additional shallow groundwater monitoring
wells have been installed beneath the basin and sampled in 2018. The results
indicate limited to no vertical migration of COIs under the basin except in areas
near the dam where downward hydraulic gradients are observed.
• Bedrock groundwater exhibits CCR-related effects primarily in areas with a
downward vertical hydraulic gradient. The effects are primarily observed near
the northern portion of the ash basin dam, beneath and downgradient of the Dry
Ash Landfill (Phase II) and a limited area downgradient of the PV structural fill.
• Deep bedrock wells have been installed below the ash basin dam in order to
further delineate the vertical extent of COIs in fractured bedrock.
• The current distribution of COIs at the MSS is contained within the Site.
• Boron is a key indicator of plume characteristics associated with the ash basin.
Additional COIs identified as having concentrations greater than their respective
standards are generally confined within the extent of the boron plume at the Site.
• Based on review and comparison with historical Site data, no significant changes
in the known COI plume were observed during evaluation of the 2018 CAMA
data.
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
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2.0 2018 MONITORING ACTIVITIES
2.1 2018 Quarterly Sampling Schedule
The monitoring well network was sampled quarterly during 2018. New wells installed
throughout the year were added to the monitoring network and quarterly sampling
program. In general, the sampling events occurred in accordance with the following
schedule:
• Quarter 1: February 7, 2018, through February 13, 2018
• Quarter 2: May 9, 2018, through May 15, 2018
• Quarter 3: August 7, 2018, through August 31, 2018
• Quarter 4: November 6 through November 12, 2018
The groundwater sampling was performed by technical personnel from Pace Analytical
who were subcontracted directly by Duke Energy. Comprehensive data submittal to
NCDEQ occurred on a monthly basis in 2018 until a quarterly submittal schedule was
approved by NCDEQ (June 06, 2018 email to Duke Energy), in accordance with the
following schedule:
• Monthly: January through July 2018
• Quarter 3: October 30, 2018
2.2 Changes to the CAMA Groundwater Monitoring Network
Following extensive review of historical boring logs, 15 transition zone monitoring
wells were reclassified to bedrock wells for consistency and quality purposes. These
wells are as follow.
• AB-31)
• AB-11D
• AB-17D
• AB-6D
• AB-12D
• AB-18D
• AB-81)
• AB-13D
• AB-20D
• AB-9D
0 AB-15D
0 GWA-12D
• AB-10D
• AB-16D
0 MW-8D
Data gaps associated with CAMA sources identified after the 2018 CSA Update include:
• Characterization of shallow groundwater underneath the ash basin.
• Delineation of COI extent in bedrock downstream of the ash basin dam (AB-1
cluster) and beneath the Dry Ash Landfill Phase II (AL-2 cluster).
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A total of 14 wells were installed at the Site in 2018 and early 2019 either to address data
gaps identified in the 2018 CSA Update (SynTerra, 2018) or to investigate additional
sources at the Site that are coincident to the ash basin. New wells were added to the
quarterly IMP monitoring schedule as they were determined to be complete and viable
for the CAMA program.
Six (6) new monitoring wells were installed in saturated saprolite directly below the ash
basin (AB). Two new monitoring wells (GWA-15D, AB-1BRLL) are dual-purpose wells
incorporated in both the IMP and CCR groundwater monitoring networks. Six (6)
additional monitoring wells were installed to characterize the bedrock flow system at
the Site. The new wells installed during 2018 and early 2019 include:
• AB-5DU
Saprolite well to characterize groundwater below AB
• AB-7DU
Saprolite well to characterize groundwater below AB
• AB-8DU
Saprolite well to characterize groundwater below AB
• AB-14DU
Saprolite well to characterize groundwater below AB
• AB-16DU
Saprolite well to characterize groundwater below AB
• AB-18DU
Saprolite well to characterize groundwater below AB
• GWA-15D
Deep/TZ well downgradient of Dry Ash Landfill (Phase I)
near unnamed tributary to Lake Norman
• AB-1BRLL
Bedrock well downgradient of AB dam (screen 195-205 ft
below ground surface [bgs])
• AB-1BRLLL
Bedrock well downgradient of AB dam (screen 403-413 ft
bgs)
• AB-2BR
Bedrock well downgradient of AB dam (screen 290-300 ft
bgs)
• AB-10BRL
Bedrock well downgradient of Dry Ash Landfill (Phase II)
(screen 250-260 ft bgs)
• AL-1BRL
Bedrock well below Dry Ash Landfill (Phase II) (screen 265-
275 ft bgs)
• AL-2BRLLL
Bedrock well below Dry Ash Landfill (Phase II) (screen 480-
490 ft bgs)
• MW-14BRL
Bedrock well downgradient of Dry Ash Landfill (Phase I)
(screen 288-298 ft bgs)
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Well installation and abandonment documentation for 2018 and early 2019 are included
in Appendix B. Well locations are shown on Figure 1-2.
Additional assessment monitoring wells associated with the coal pile, gypsum pad, PV
structural fill, and unlined structural fill beneath Industrial Landfill No. 1 have been
installed in 2019.
2.3 Water Level Measurements
During each 2018 quarterly IMP sampling event, water levels were measured for the
CAMA monitoring well network to generate water level maps of monitored flow zones.
Site topography was used to infer water level contours where groundwater level data
was not present. Water levels were recorded during a 24-hour period (prior to well
purging and sampling) using a water level indicator and referenced to a surveyed top
of well casing mark.
CCR Rule compliance monitoring well water level data are generally not included in
data evaluations for 2018 because water levels from the wells were not collected during
the 24-hour period in which CAMA IMP water levels were collected. As of Quarter 1
2019, Duke Energy has implemented an optimized program that includes selected CCR
wells to provide better water level data coverage across the Site.
Groundwater elevations calculated from water levels measured during each quarterly
2018 IMP sampling event are provided in Table 2-1. Groundwater flow direction and
velocity are discussed in Section 3.1. A copy of the water level measurements from the
CAMA monitoring well network is included in Appendix B.
2.4 Groundwater Sampling Methods
Field personnel conducted groundwater sampling following procedures outlined in the
NCDEQ-approved Low Flow Sampling Plan, Duke Energy Facilities, Ash Basin Groundwater
Assessment Program. Groundwater sampling using low flow methods helps to reduce
agitation during sampling, resulting in lower sample turbidity. A copy of the Low Flow
Sampling Plan is included as Appendix C.
Groundwater quality field parameters were measured and recorded during the
monitoring well purging process. The field parameters included the following: pH,
specific conductivity, temperature, dissolved oxygen, oxygen -reduction potential, and
turbidity.
Upon collection of a groundwater sample, the chain of custody (COC) was updated and
kept with the respective samples. Upon completion of the sampling, the sample bottles
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were packed on ice and chilled to approximately 4 degrees Celsius (°C). The sample
coolers and accompanying COCs were shipped to the analytical laboratory by
overnight express courier.
Copies of sampling logs and 24-hour water level data sheets are included in
Appendix B.
2.5 Laboratory Analyses
The groundwater samples were analyzed for the parameters listed in the 2018 IMP
(Appendix A). Groundwater quality analyses were performed by a North Carolina
certified laboratory.
2.6 Quality Control Summary (Data Validation)
Data review and validation is conducted for CAMA analytical results. Data review is a
systematic process for evaluation of data against a predefined set of criteria to provide
assurance that the data meet project analytical Data Quality Objective (DQO)
requirements. The purpose of the data review process is to evaluate whether the
usability of analytical data is affected by the overall analytical processes and sample
collection and handling procedures. If specific analytical DQOs are not met, the data
are qualified (i.e., data flags are assigned to sample results) in accordance with
guidelines established by the United States Environmental Protection Agency (USEPA).
Data review allows the data user to adequately determine whether the data can be used
for its intended purpose. The data acceptance criteria are established according to
Standard Operating Procedures and Statements of Work provided to the contracted
analytical laboratory.
Upon receipt of the groundwater analytical data from the respective laboratories, the
data was uploaded into the project -specific database. SynTerra then performed
independent quality control checks of field and laboratory procedures that were used in
collecting and analyzing the data. The steps and guidelines followed during the data
validation process were modeled on the USEPA Contract Laboratory Program National
Functional Guidelines for Organic Superfund Methods Data Review (USEPA, January
2017a), USEPA Contract Laboratory Program National Functional Guidelines for
Inorganic Superfund Methods Data Review (USEPA, January 2017b), Multi -Agency
Radiological Laboratory Analytical Protocols Manual (MARLAP), Manual Volume I:
Chapter 8, Radiochemical Data Verification and Validation (MARLAP, July 2004), and
Data Validation Standard Operating Procedures for Contract Laboratory Program
Routine Analytical Services Inorganic Analysis (USEPA, September 2011). In addition,
method -specific criteria set forth in the compendium of analytical methods found in the
Test Methods for Evaluation Solid Waste; Physical/Chemical Methods (SW-846),
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Update VI (USEPA, November 2017 [Phase I] and July 2018 [Phase II]) are also
evaluated during the validation process. This data review process has been adapted to
meet the analytical DQO requirements for generation of definitive critical data.
The quality control checks verify that the data collected are of appropriate quality for
the intended data use and that the analytical DQOs were met. Thus, all data
determined to be useable should be considered compliant and adequate for its intended
use of monitoring water quality at the Site.
Data validation checklists that were completed for each laboratory package, by quarter,
are presented in Appendix D.
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3.0 2018 MONITORING RESULTS
3.1 Site -Wide Groundwater Occurrence and Flow
Comprehensive monitoring well locations are shown on Figure 1-2. Water level
elevations for the CAMA IMP monitoring in 2018 are summarized on Table 2-1.
Water level maps (Figures 3-1, 3-2, and 3-3) for each monitoring zone were created from
water levels gauged in November 2018. General groundwater flow directions can be
inferred from the water level contours shown on the shallow, deep, and bedrock flow
zone figures. The ash basin encompasses a former dendritic drainage system where
groundwater flow direction varies locally, but generally flows from the northwest to the
southeast towards Lake Norman.
The water table at the Site is typically located within the shallow flow zone. Figure 3-4
shows hydrographs for selected wells along primary flow transects in the ash basin.
Groundwater levels were generally consistent throughout 2018. With the exceptions of
MW-4 and MW-41), which showed decreases in groundwater elevations as discussed in
Section 1.3, no other significant changes in water levels or groundwater flow directions
were noted in the fourth quarter 2018 groundwater elevation data compared to
previous measurements dating back to 2015.
Figures 3-5, 3-6, and 3-7 are plan view velocity vector maps for groundwater in the
shallow, deep, and bedrock flow zones throughout the Site. Figure 3-8 shows a cross-
section velocity vector map oriented approximately northwest -to -southeast through the
ash basin dam. These maps were created from comprehensive Site data incorporated
into the Site's flow and transport model. Arrows illustrate the direction and magnitude
of groundwater flow at thousands of individual modeled locations. Various colors
illustrate relative flow velocities in feet per day (ft/day): red, orange, and yellow areas
demonstrate the highest flow velocities (>0.2 ft/day); green areas demonstrate mid-
range flow velocities (0.05-0.2 ft/day); and blue areas demonstrate the lowest flow
velocities (<0.05 ft/day). These figures provide additional support in understanding
groundwater flow throughout the Site in three dimensions. Key conclusions from
evaluation of these figures include:
• Velocity vector maps (Figures 3-5, 3-6, and 3-7) generally align with
groundwater flow directions throughout the Site inferred from water level maps
(Figures 3-1, 3-2, and 3-3).
• Flow velocities beneath the Dry Ash Landfill Phase I are greater in the shallow
zone (Figure 3-5) than in the deep and bedrock zones (Figures 3-6 and 3-7). The
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
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majority of velocities in the shallow zone beneath the Dry Ash Landfill Phase I
are greater than 0.4 ft/day, whereas the majority of velocities in the deep and
bedrock zones in this area are less than 0.2 ft/day.
Groundwater flow velocities are generally higher in the deep and bedrock flow
zones beneath and immediately downstream of the ash basin dam, than beneath
the ash basin (Figures 3-6 and 3-7). This indicates that the areas beneath the dam
act as preferential flow and transport pathways in fractured bedrock
downgradient of the basin.
• Groundwater flow velocities along the ash basin cross-section (Figure 3-8) are
generally lower within and beneath the ash basin and increase beneath the ash
basin dam. The notable exception - the area of increased permeability
upgradient of the ash basin pond - is an effect of the model calibration to
measured hydraulic heads.
Prior studies and groundwater modeling have demonstrated that the ash basin is a
flow -through basin with groundwater discharging into the upgradient ends, flowing
laterally through the middle regions and discharging downward in the vicinity of the
dam. Figures 3-9, 3-10, and 3-11 present General Cross -Sections A -A', B-B', and C-C'
across the ash basin. These cross -sections illustrate the hydrogeology and COI
occurrence in the vicinity of the ash basin. Section A -A' (Figure 3-9) shows subsurface
conditions across the ash basin from the northwest upgradient area to the southeast
downgradient area. Section B-B' (Figure 3-10) shows subsurface conditions across the
ash basin from the west near the FGD Residue Landfill to the east at the southern
portion of the ash basin dam. Section C-C' (Figure 3-11) shows side -gradient subsurface
conditions across the ash basin from the upgradient eastern portion of the basin to the
upgradient western portion of the basin.
The ash basin water level and groundwater flow directions for the fourth quarter 2018
are illustrated on the cross -sections. The CAMA 2018 calculated geomeans for boron are
posted at the respective well locations at the screened intervals. This data provides a
representation of COI distribution with depth. This data supports the prior findings
that the flow -through system with a dominant horizontal component of flow results in
limited downward vertical migration of COIs into the underlying aquifer upgradient
from the dam. In the vicinity of the dam, groundwater flows downward out of the basin
and under the dam. Beyond the dam, the hydraulic gradient causes upward flow
discharging to Lake Norman. This limits downward vertical migration of COIs from the
ash basin to the area in close proximity to the dam.
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3.1.1 Horizontal Gradients
Horizontal hydraulic gradients were derived for the shallow, deep, and bedrock
flow zones using November 2018 water level measurements. These gradients
were derived by calculating the difference in hydraulic head over the length of a
flow path between two water level contour intervals within the same flow zone
(Table 3-1). The following equation was used to calculate horizontal hydraulic
gradients:
i=dh/dl
Where i is the hydraulic gradient; dh is the difference between two hydraulic
heads (measured in feet); and dl is the flow path length between the two water
level contours within the same flow zone (measured in feet).
Applying this equation along generalized groundwater flow paths observed at
the Site, based on contours presented in Figures 3-1, 3-2 and 3-3, yields the
following average horizontal hydraulic gradients (measured in feet/foot) as
shown on Table 3-1:
• Shallow flow zone: 0.018 feet/foot
• Deep flow zone: 0.020 feet/foot
• Bedrock flow zone: 0.016 feet/foot
These calculated horizontal hydraulic gradients generally align with
groundwater flow velocity magnitudes presented on velocity vector maps
(Figures 3-5 through 3-8). The velocity vector maps provide refined evaluations
of horizontal flow through modeled outputs.
3.1.2 Vertical Gradients
Vertical hydraulic gradients (dh/dl) were calculated at certain well clusters using
the November 2018 water level elevations and the midpoint elevations of the
well screens (Table 3-2).
Figure 3-8 illustrates groundwater velocity vectors and magnitudes on a cross-
section oriented northwest to southeast through the ash basin. As shown on the
figure, an upward vertical gradient under the basin near former stream valleys is
observed. This upward gradient acts to limit downward vertical migration of
COIs under the basin. Near impoundment features such as the ash basin dam,
the gradient from ash pore water to groundwater is downward.
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
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Natural upward vertical gradients are present under the ash basin within former
stream valleys. The upward gradients prevent downward vertical migration of
COIs to groundwater beneath the ash basin. This concept is verified by the
upward vertical gradient between the bedrock (AB-12BR) and deep (AB-12D)
flow zones (-0.08 ft/ft) at the AB-12 cluster within the former Holdsclaw Creek
footprint. The artesian conditions observed in AB-12BR (approximately 2+ feet of
hydraulic head above ground surface) exemplify the CSM.
Near impoundment features such as dams or dikes, the vertical gradient from
ash pore water to groundwater is typically downward. Immediately downstream
of the dam, upward vertical gradients within bedrock are observed at the AB-1
well cluster near Lake Norman (-0.11 ft/ft between AB-1BR and AB-11)). One
exception is observed between AB-1BR and AB-1BRL, which indicates a slightly
downward vertical gradient (0.05 ft/ft) within the upper bedrock flow zone. The
gradient calculated between AB-1BRL and AB-1BRLL (0.006 ft/ft) is considered to
be neutral based on water elevations. Artesian conditions are present in the
multiple bedrock wells at the AB-1 location, which is consistent with the CSM as
groundwater approaches a discharge zone.
Downgradient of the ash basin and Dry Ash Landfill (Phase I), vertical gradients
were calculated at well cluster GWA-11S/D/BR. A minor downward vertical
gradient is observed between the shallow flow zone and deep flow zone (0.03
ft/ft), and the vertical gradient is near neutral (0.008 ft/ft) between the deep flow
zone and bedrock flow zone (Table 3-2). The elevated hydraulic head of the
ponded water in the ash basin may be contributing to the minor downward
component of flow downgradient, however this gradient is expected to decrease
with basin decanting. This observation is consistent with flow patterns that
typically follow general Site topography outside of the ash basin.
Beneath and downgradient of the Dry Ash Landfill (Phase II), vertical gradients
were calculated at four well clusters associated with the source area. A
downward vertical gradient is observed between deep and bedrock flow zones
and between bedrock and deep bedrock flow zones in the AL-2, AL-3, and AL-4
clusters (Table 3-2). The downward vertical gradients (0.01 ft/ft to 0.08 ft/ft) are
notable for the AL-2 well cluster where boron is observed in deeper bedrock
wells, with concentrations ranging from 2,060 µg/L (AL-2BRL) to 10,169 µg/L
(AL-2BRLL). This location is outside the former perennial stream valleys which
contain the ash basin, thus is not subject to the hydraulic setting which limits
vertical migration of COIs.
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3.1.3 Groundwater Seepage Velocity
Groundwater seepage velocities were calculated using fourth quarter horizontal
hydraulic gradients (Table 3-1). Hydraulic conductivity and effective porosity
values were taken from the November 2018 updated groundwater flow and
transport model (Falta et al., 2018). Calibrated conductivity and porosity values
for each flow zone were used in an effort to align velocity calculations with
model predictions.
The groundwater flow and transport model provided a hydraulic conductivity
(k) for the shallow flow zone of 1.0 feet per day (ft/day), 1.5 ft/day for the deep
flow zone, and 0.7 ft/day for the bedrock flow zone. The flow and transport
model provided an effective porosity of 30 percent for the shallow flow zone, 30
percent for the deep flow zone, and 1 percent for the deep flow zone.
The horizontal groundwater seepage flow velocity can be estimated using a
modified form of the Darcy Equation (Table 3-1).
VS e (dh)
dl
Where v, is the seepage flow velocity; ne is the effective porosity; and k is the
horizontal hydraulic conductivity.
During the fourth quarter sampling event, the estimated horizontal groundwater
flow velocity in the vicinity of the PV structural fill was:
• 0.064 ft/day (23.4 ft/yr) in the shallow flow zone
• 0.104 ft/day (38.02 ft/yr) in the deep flow zone
• 1.5 ft/day (547.5 ft/yr) in the bedrock flow zone
In the vicinity of the ash basin, the estimated horizontal groundwater flow
velocity was:
• 0.027 ft/day (9.94 ft/yr) in the shallow flow zone
• 0.034 ft/day (12.39 ft/yr) in the deep flow zone
• 0.575 ft/day (210.0 ft/yr) in the bedrock flow zone
In the vicinity of the Dry Ash Landfill Phase II, the estimated horizontal
groundwater flow velocity was:
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• 0.034 ft/day (12.48 ft/yr) in the shallow flow zone
• 0.052 ft/day (18.81 ft/yr) in the deep flow zone
• 0.398 ft/day (145.17 ft/yr) in the bedrock flow zone
In the vicinity of the Dry Ash Landfill Phase I, the estimated horizontal
groundwater flow velocity was:
• 0.117 ft/day (42.84 ft/yr) in the shallow flow zone
• 0.205 ft/day (75.0 ft/yr) in the deep flow zone
• 1.963 ft/day (716.36 ft/yr) in the bedrock flow zone
The geometric mean of estimated horizontal groundwater flow velocities in the
shallow flow zone was 0.051 ft/day (18.8 ft/yr), 0.078 ft/day (28.6 ft/yr) in the
deep flow zone and 0.906 ft/day (330.7 ft/yr) in the bedrock flow zone (Table
3-1).
3.2 Data Reduction and Evaluation
Groundwater samples from the CAMA monitoring well network were analyzed for the
constituents listed on the IMP approval letters (Appendix A). The analytical results
from each sampling event in 2018 are summarized on Table 3-3. Data qualifiers and
acronyms specific to the data table are summarized and defined on Table 3-4. The
laboratory analytical reports and accompanying data validation checklists are presented
in Appendix D.
This annual report presents and discusses the sampling results of 2018 CAMA
monitoring. The geomean of four quarters of data was calculated for each identified
COI to support the analysis of groundwater conditions and provide a basis for defining
the extent of the plume in 2018. The geomean was selected in order to capture the
central tendency of the data, which might vary over several orders of magnitude. If four
quarters of valid data were not available, the most recent valid sample result was
reported. Four quarters of valid data may not be available for a well if the well was
recently installed or sample results from one quarter were excluded. Non -detect values
were assigned the lab reporting limit, and estimated (J-flag) values were treated as the
value reported.
Based on USEPA's National Functional Guidelines (USEPA, 2017a, 2017b), published
research upon the leaching behavior of elements from coal combustion fly ash
(Izquierdo et al., 2012) and professional judgement, sample results were excluded from
calculations for the following conditions:
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• turbidity was greater than 10 Nephelometric Turbidity Units (NTUs)
• pH was greater than 10 standard units (S.U.) (for antimony, arsenic,
molybdenum, selenium, and vanadium only)
• if the data was flagged as unusable (RO qualified)
• if the data was non -detect at a reporting limit greater than the normal laboratory
reporting limit
Table 3-5 presents the calculated geomeans of the quarterly COI data. The grey
highlighting in the table illustrates which reported values are not calculated geomeans.
When geomeans could not be calculated, the most recent valid sample was evaluated to
determine whether the sample result is an appropriate representation of the historical
dataset. Sample results with COI concentrations significantly greater or lesser than the
historical average concentration were identified as outliers. After evaluating the data,
no outliers were identified and all data on Table 3-5 have been included for use in
evaluating plume geometry.
Geomeans are used to evaluate the occurrence of COIs at the Site. A single sample
result may not be an accurate representation of the concentrations observed over four
quarters of data in 2018. Evaluating plume geometries with geomeans limits the
occurrence of isolated COIs at concentrations greater than enforceable groundwater
standards.
Data from CCR Rule compliance monitoring wells are used for evaluating plume
geometry. The 2019 IMP was optimized in March 2019 to include additional CCR wells
to more efficiently define plume extents and identify plume geometry changes. Data
from CCR wells is used in this report on isoconcentration figures and time -series plots
for a complete evaluation of COI occurrence in the vicinity of the ash basin. These
figures are discussed in Sections 3.4 through 3.9 of this report.
The BTVs, 02L standard, and or IMAC for each COI are summarized by flow layer at
the top of Table 3-3. Text, figures, and tables in this report reflect the updated BTVs
approved by NCDEQ in 2018. Per 15A NCAC 02L .0202(b)(3), Site -specific BTVs
calculated at concentrations greater than 02L standards or IMACs are the enforceable
groundwater standards.
Table 3-6 is a summary of an evaluation of COIs at the Site. The COI list from the 2018
CSA Update was evaluated to determine which COIs effectively define the plume at the
Site. Table 3-6 provides the following information:
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• Applicable comparison criteria (02L standard, IMAC, or approved background
threshold values).
• Maximum 2018 geomean concentration near or outside compliance boundary.
• Exceedance ratio of the maximum geomean divided by the comparison criteria
value.
• The number of wells above criterion near or outside of the compliance boundary.
• Rationale for not including specific COIs in isoconcentration figures or time -
series plots.
Constituents that are detected near or beyond the compliance boundary at exceedance
ratios greater than one in multiple wells may be appropriate for defining plume
geometry. A discernable plume cannot be defined for reactive COIs that occur in
limited spatial distribution. For the purposes of monitoring groundwater quality at the
Site, boron provides a good indication of the occurrence and distribution of CCR-
related COIs. COIs other than boron also occur at concentrations greater than criterion,
but are generally contained within the boron plume and do not change overall plume
geometry at the Site.
Antimony, arsenic, cadmium, hexavalent chromium, total chromium, nickel and
vanadium were included as COIs in the 2018 CSA Update. After further data
evaluation, these constituents do not occur near or outside of the compliance boundary
at concentrations greater than a comparative criterion (Table 3-6). With the exception
of hexavalent chromium due to public perception, these constituents are recommended
for removal from the COI list for the MSS moving forward. Several other COIs
identified in the 2018 CSA Update (i.e., barium, beryllium) have sporadic and limited
detections of concentrations greater than the comparative criteria (Table 3-6), and do
not have a discernable plume associated with them.
COIs are those parameters with concentrations greater than groundwater screening
criteria (02L standard, IMAC, or background threshold values). COIs that meet the
following criteria may be designated for future corrective action:
1) Occur downgradient of the ash basin in the direction of groundwater flow;
2) Exhibit concentrations in groundwater at or beyond the compliance boundary
greater than the 02L standard, IMAC, or approved background values,
whichever is greater;
3) Exhibit high to variable mobility (exhibit a discernable plume); and
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4) Demonstrate correlation with other soluble constituents associated with coal
Based on the criteria above, the following groundwater COIs are anticipated to be
evaluated in the CAP:
Barium Iron Selenium
Beryllium Lithium Strontium
Boron Manganese Sulfate
Chloride Molybdenum Thallium
Cobalt Radium Total Dissolved Solids
The groundwater COIs identified at MSS occur in CCR and are also naturally occurring
in groundwater. Certain COIs (e.g., cobalt, iron, manganese, and total radium) have
background concentrations in one or more flow zones at the Site greater than their 02L
standard or IMAC. The 2018 CSA update used site -specific Provisional BTVs (PBTVs)
for comparison. NCDEQ approved site -specific BTVs for MSS in a letter to Duke Energy
dated June 15, 2018. BTVs for the Site have been updated and were submitted to DEQ in
April 2019 to be approved for inclusion in the 2019 CAP.
Table 3-7 provides a summary of background threshold values calculated for the Site
COIs as defined in the 2018 CSA Update. The BTVs have been updated in 2019 to
include all background data collected between June 2015 and December 2018. The 2019
Updated BTVs are anticipated to be submitted to NCDEQ in May 2019. BTVs are
statistically derived upper tolerance limits (UTLs). The UTL represents an upper limit of
a range of values in which a specified proportion of the data population resides with
some level of statistical confidence. Concentrations observed in upgradient wells at the
Site may exceed BTVs but still be within the range of typical background concentration
in the North Carolina Piedmont. Table 3-7 includes constituent concentration ranges
detected in background wells at Marshall Steam Station, and regional concentration
ranges detected in background wells in the six Duke Energy facilities located in the
North Carolina Piedmont.
Plume migration is typically evaluated by means of a conservative (non -reactive)
constituent with low or well- established concentrations in the natural environment.
Cobalt and manganese are both geochemically reactive constituents with a potential for
sub -surface transport (i.e., mobility determined by laboratory and modeled sorption
coefficients) which varies orders of magnitude over the range of redox and pH
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conditions observed at the Site. Additionally, a study conducted by Polizzotto, et al.
(2015) found that roughly 50 % of wells in NC have manganese concentrations greater
than the 02L Standard (50 µg/L). This same report noted that manganese in NC is
naturally sourced. Cobalt is known to naturally associate with manganese minerals in
the Southeastern United States (Pierce, 1944). Given the geochemically reactive nature
of cobalt and manganese and their known prevalence in the Piedmont Region of NC,
they are not suitable constituents for evaluation of plume geometry.
For the purposes of monitoring Site -wide groundwater quality at the MSS, boron is the
COI that provides the most thorough representation of the overall occurrence and
distribution of CCR-related COIs. Boron was selected as an indicator for
comprehensive COI plume evaluation because:
• It is highly mobile in groundwater and relatively unaffected by changing
geochemical conditions.
• Additional COIs identified as being greater than their respective standards are
generally confined within the extents of the boron plume at the Site.
Isoconcentration maps depicting distributions of boron in the shallow, deep, and
bedrock flow zones across the Site are provided as Figures 3-12 to 3-14.
Time -series graphs were produced to provide an ongoing evaluation of change in water
quality through time for key monitoring wells and are presented in Figures 3-15 to 3-22.
COIs selected for time -series evaluations include the following:
• Boron
• Cobalt
• Manganese
These COIs were chosen to illustrate the occurrence of additional constituents that are
typically observed coincident with boron and in some instances occur beyond the boron
plume. Based on review of time series graphs (Figures 3-15 to 3-22), cobalt and
manganese concentrations in monitoring wells not screened in ash pore water appear to
be generally stable and independent with regards to increasing boron concentrations.
In some instances, most notably in ash pore water wells, increases or fluctuations in
cobalt and manganese concentrations are observed to mimic boron concentrations, as
illustrated in ash pore water well AB-1S plotted on Figure 3-15. These observations
further demonstrate that boron is a key indicator (i.e., leading edge constituent) of COI
plume status at the Site.
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3.3 Ash Basin Water Quality
3.3.1 Site Conditions
Duke Energy converted to dry handling of bottom ash at the MSS in October
2018. Bottom ash is no longer sluiced to the MSS ash basin. All other process
wastewater was rerouted to a lined retention basin in April 2019. These actions
may have a significant effect on Site conditions by eliminating loading of
additional contaminant mass to the basin. In addition, once decanting of free
water in the MSS ash basin is initiated, the mounding effect currently observed in
the basin may be reduced and the vertical gradients near the dam are expected to
decrease.
Continued construction activities associated with the Water Redirect Program
may influence groundwater flow or quality at the Site.
Decanting of the MSS ash basin is required to begin by September 30, 2019.
Transducers are planned to be deployed in wells located in and around the ash
basin to record changes in water levels during basin decanting.
Shallow monitoring wells were installed beneath the ash basin in 2018 to further
refine the groundwater plume beneath the ash pore water in the saprolite zone.
Out of the six new wells, only two (AB-8DU, AB-14DU) had a detection of boron
at a concentration greater than the reporting limit of 50 µg/L. These data further
support the limited extent of vertical COI migration beneath the ash basin and
are discussed in further detail below.
3.3.2 Constituent Occurrence and Plume Status
The geomean of the four quarters of boron data was used to evaluate the Site -
specific COIs in groundwater (Table 3-5). Boron is used to delineate the
groundwater plume beneath the ash basin because it is considered an indicator
constituent for groundwater influence from CCR.
Figures 3-12, 3-13, and 3-14 are isoconcentration maps illustrating the occurrence
of boron in the shallow, transition zone/deep, and bedrock flow zones at the Site.
Boron results for the ash pore water wells are included on shallow
isoconcentration Figure 3-12 for source concentration reference only.
The greatest concentrations of boron at the Site were detected in ash pore water
wells located in the central eastern portion of the basin (AB-10S and AB-12S)
with generally lesser concentrations in ash pore water wells located in the
northern and western portions of the basin. Six deeper saprolite wells (identified
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with "DU" nomenclature) were installed in 2018 to evaluate the vertical extent of
CCR-related effects beneath the ash basin in groundwater.
The results of the samples in the deeper saprolite (DU) wells indicate that vertical
migration of COIs to the saprolite flow zone just beneath the ash basin is limited.
For example, in ash pore water well AB-7S the geomean concentration of boron
was 15,380 µg/L, whereas in co -located saprolite well AB-7DU the boron
concentration was less than the reporting limit (<50 µg/L). The shallow flow
zone data supports the updated Site CSM which describes a shallow flow system
that is dominated by horizontal flow through the ash basin, limiting downward
COI transport to the underlying groundwater beneath the ash basin.
The current plume geometry (Figures 3-12 to 3-14) is consistent with plume
geometry presented in the 2018 CSA Update. Based on these observations, the
leading edge of the boron plume is adequately defined. Consistent with the
results of the updated CSM, plume migration towards the unnamed tributary to
Lake Norman beyond the compliance boundary is limited to the shallow flow
zone in this area. This is supported by velocity vector maps presented on
Figures 3-5 to 3-7, which depicts a greater flow velocity towards the unnamed
tributary in the shallow zone (up to 1 ft/day) when compared to the deep and
bedrock flow zones (generally <0.3 ft/day) in this area.
Boron concentrations greater than the 02L standard indicate the plume is
confined to a limited, downgradient area east of the ash basin. Boron
concentrations in this area generally decrease with depth leading to a reduced
boron plume from shallow to deep flow zones as indicated in Figures 3-12 to 3-
14. The bedrock flow zone boron plume is confined to a small area located
downgradient from the northern portion of the ash basin dam in the vicinity of
the AB-1 well cluster, and downgradient from the Dry Ash Landfill Phase II in
the vicinity of the AB-12 and AB-10 well clusters (Figure 3-14). As mentioned
above, the bedrock plume downgradient from the Dry Ash Landfill Phase II is
not considered to be associated with the ash basin and is discussed further in
Section 3.5.
Boron at concentrations greater than the 02L standard are generally confined
within the ash basin compliance boundary with the exception of shallow wells
GWA-11S and GWA-15S, and deep transition zone well GWA-11D. These wells
are located east of the Dry Ash Landfill Phase I towards Lake Norman. Based on
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review of groundwater flow paths and plume geometry, these locations are
currently considered the leading edge of the boron plume.
Transition zone well GWA-15D was installed in 2018 adjacent to GWA-15S and
downgradient of GWA-11D to further delineate the vertical extent of CCR-
related impacts observed in GWA-15S and the horizontal extent of impacts
observed in GWA-11D. The absence of boron in GWA-15D (<50 µg/L) indicate
affected groundwater has not migrated downward to the deep flow zone in the
vicinity of the leading edge of the plume. In addition, the concentration of boron
in bedrock monitoring well GWA-11BR is less than 50 µg/L.
Boron concentrations above the 02L standard attributable to the ash basin in the
bedrock flow zone are limited to monitoring wells in the AB-1 cluster located
downstream of the northern portion of the ash basin dam. The concentrations
observed in AB-1BR, AB-1BRL, and AB-1BRLL generally decrease with depth
(Figure 3-14). These results are consistent with the CSM which describes limited
downward vertical migration of COIs within the ash basin. In the vicinity of the
dam, groundwater flows downward out of the basin and under the
dam. Downstream of the dam, an upward hydraulic gradient is present.
Observations of boron occurrences beneath the ash basin that are potentially not
associated with the ash basin plume migration include the following:
• The boron plume located beneath the Dry Ash Landfill Phase II is located
mostly outside the ash basin (Figures 3-12 to 3-14). In the bedrock flow
zone, the plume appears to extend downgradient from the landfill and
encompasses the AB-10 and AB-12 monitoring well clusters. Boron
detections in the transition zone adjacent to these locations (CCR-15D) are
less than the laboratory reporting limit (<50 µg/L). Based on this
observation, the detections of boron in these bedrock wells may be
attributable to COI migration from the Dry Ash Landfill Phase II.
• Similar to bedrock detections associated with the Phase II Dry Ash
Landfill, concentrations detected downgradient from the PV structural fill
in bedrock monitoring well AB-61) (Figure 3-14), located beneath the ash
basin, are greater than concentrations detected in co -located ash pore
water well AB-6S (Figure 3-12). Boron detections observed in AB-61) may
be attributable to plume migration within the bedrock flow zone from the
additional source areas (i.e., PV structural fill, access road structural fill).
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Additional source areas with plumes coincident with the ash basin are discussed
in further detail in Sections 3.5 through 3.9.
In late 2018 and early 2019, additional deep bedrock wells were installed
downgradient and in close proximity to the dam (AB-1BRLLL and AB-2BR) to
further evaluate the extent of vertical migration of COIs in this area. These new
wells have been sampled in 2019 and the results will be incorporated in future
reporting.
COIs were detected at concentrations greater than the 02L/IMAC and
background values in the following wells beyond the extent of the boron plume:
Shallow
• AB-9S - cobalt, iron, and manganese
• AB-16S - cobalt, iron, and manganese
• MW-6S - cobalt and manganese
• MW-8S - TDS and manganese
Deep
• AB-4D - iron
• MW-7D - iron, manganese, and total radium
• MW-91) - manganese
Bedrock
• MW-81) - iron
• AB-12BR - total radium
• AL-1BR - total radium
In each of those wells, boron was detected at concentrations greater than
background levels. Those boron concentrations ranged from 51 µg/L (AB-9S) to
581 µg/L (AL-113R). Considering that these wells are coincident with boron
concentrations greater than background, these COI concentrations may be
attributable to migration from the ash basin. Additional background data
collection may help determine if some concentrations (i.e., radium in bedrock)
may be naturally occurring. The COIs in these wells will continue to be
monitored during future CAMA sampling events and the results will be
evaluated for changing conditions.
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Time series graphs of select monitoring well clusters associated with the ash
basin are provided on Figures 3-15 through 3-18. These wells were selected to
illustrate boron occurrence in locations near the leading edge of the plume and in
close proximity to the dam, and at locations within the plume where significant
boron occurrence is observed. Review of the concentration trends in these wells
provides the following observations:
Increasing trends in boron concentrations are observed in the transition
zone and upper bedrock at the AB-1 location downgradient from the ash
basin dam (AB-11), AB-1BR, and AB-1BRL; approximately 91-166 ft bgs).
Boron concentrations in lower bedrock well AB-1BRLL (195-205 ft bgs) are
relatively stable with an average concentration of 1,880 µg/L based on the
first 3 valid sampling events. A deeper bedrock well, AB-1BRLLL (403-
413 ft bgs), was recently installed to further delineate boron occurrence at
this location; results from this well will be presented at a later date. As
predicted by the CSM, upward vertical gradients in bedrock at this
location (verified by observed artesian conditions) limit further vertical
migration of COIs as groundwater nears a discharge zone (i.e., Lake
Norman).
• Concentrations of boron in GWA-11S are generally stable around 2,700
µg/L with some fluctuations observed. Boron concentrations in GWA-11D
have remained stable since September 2017. Boron concentrations in
GWA-11BR are stable and generally at or below the reporting limit of 50
µg/L. Similarly, and immediately downgradient of GWA-11, boron
concentrations have remained stable around 1,500 µg/L in GWA-15S;
boron concentrations in transition zone well GWA-15D are typically
below the reporting limit. These trends indicate that COIs have not
migrated vertically into the bedrock flow zone in the draw downgradient
of the ash basin towards the unnamed tributary.
• Boron concentrations plotted at other well cluster locations associated
with the ash basin do not indicate any significant increases or decreases in
concentrations and are generally stable.
Evaluation of the significance of trends will continue as additional groundwater
quality data from future monitoring events become available.
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3.4 Dry Ash Landfill (Phase II) Water Quality
3.4.1 Site Conditions
The Dry Ash Landfill Phase II is an unlined landfill constructed under NCDEQ
Division of Solid Waste Permit No. 1804-INDUS. The Dry Ash Landfill Phase II
partially overlaps the northeast portion of the ash basin. The approximate
boundary of the Dry Ash Landfill Phase II is shown on (Figure 1-2). Placement
of ash in the Dry Ash Landfill Phase II began around March 1986 and was
completed in 1999.
The location of the Dry Ash Landfill Phase II is primarily outside the limits of the
former perennial stream valley described in the updated CSM. Therefore, this
landfill is not subject to the lateral flow conditions restricting downward vertical
migration of COIs into the underlying aquifer. The landfill is located
sidegradient from the ash basin, and the current distribution of COIs are
generally confined to areas beneath the landfill. Therefore, the Dry Ash Landfill
Phase II is considered an additional source of COIs at the Site that is coincident
to, but not associated with, the ash basin plume geometry. The need for
additional delineation of impacts beneath the Phase II landfill were identified in
the CSA Update (SynTerra, 2018), and efforts have been underway in accordance
with NCDEQ approval.
3.4.2 Constituent Occurrence and Plume Status
The geomean of the four quarters of boron data was used to evaluate the
groundwater quality in the area. Boron is used to delineate the groundwater
plume beneath the Dry Ash Landfill Phase II because it is considered an
indicator constituent for groundwater influence from CCR.
Figures 3-12, 3-13, and 3-14 are isoconcentration maps illustrating the occurrence
of boron in the respective shallow, transition zone/deep, and bedrock flow zones
at the Site. Based on review of 2018 CAMA geomean data calculations (Table 3-
5), COIs associated with the Dry Ash Landfill Phase II that have detected
concentrations greater than their respective 02L standards are confined within
the extents of the 02L boron plume in each respective flow zone.
Due to its location primarily outside of the former perennial stream valley, the
Dry Ash Landfill Phase II is not subject to the lateral flow conditions restricting
downward vertical migration of COIs as described in the updated CSM. This is
evidenced by detections of COIs observed in all three flow zones beneath the
landfill (Table 3-5), indicating that COIs are leaching from the landfill into the
underlying aquifer.
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The current plume geometry attributable to the Dry Ash Landfill Phase II is
consistent with plume geometry presented in the 2018 CSA Update.
The distribution of boron at concentrations greater than the 02L standard
beneath the Dry Ash Landfill Phase II in the shallow and transition/deep flow
zones is confined to the extents of the landfill boundary, as shown on Figures 3-
12 and 3-13. Boron detected beneath the landfill in the bedrock flow zone is
generally confined to the extents of the landfill boundary, with potential
migration resulting in the concentrations observed in monitoring wells AB-10D
and AB-12D (Figure 3-14).
Data from CCR Rule compliance wells CCR-15S and CCR-15D indicate boron is
not detected in the shallow and deep flow zones immediately east of the AB-10
location, also downgradient of the Dry Ash Landfill Phase H. This observation
indicates the migration of COIs from the Dry Ash Landfill Phase II is limited to
areas of potential preferential flowpaths (i.e., toward AB-10). Boron
concentrations in deeper bedrock monitoring wells AB-10BR (296 µg/L) and AB-
12BR (59 µg/L), compared to boron concentrations in AB-10D (1,414 µg/L) and
AB-12D (1,191 µg/L) indicate decreasing boron concentrations (below 02L
standards) with depth. Deep bedrock monitoring well AB-10BRL (250-260 ft bgs)
was recently installed to further evaluate the vertical extent of COI occurrence
downgradient from the Dry Ash Landfill Phase II. Results from this well will be
presented at a later date.
Time series graphs for select monitoring well clusters associated with the Dry
Ash Landfill Phase II are provided on Figures 3-19 and 3-20. These wells were
selected based on their location within the Dry Ash Landfill Phase II boron
plume where significant boron occurrence is observed. Boron concentrations are
notable in the AL-2 well cluster where it is observed to increase with depth in
AL-2BRLL. Review of the concentration trends in these wells provides the
following observations:
• Boron concentrations indicate increasing trends in groundwater beneath
the Dry Ash Landfill Phase II in AL-2S, AL-2D, AL-2BR and AL-2BRL.
Concentrations in deeper bedrock well AL-2BRLL are generally
decreasing (10,500 µg/L in August 2018 to 7,880 µg/L in November 2018).
Based on the location of the AL-2 well cluster located outside the waste
boundary of the ash basin, the observed trends are attributable to
downward vertical COI migration from the Dry Ash Landfill Phase H.
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• As shown on Figure 3-20, concentrations of boron in the bedrock flow
zone downgradient of the Dry Ash Landfill Phase II in AB-10D have
increased since sampling was initiated in 2015, but have remained
relatively stable during the 2018 CAMA monitoring. Boron
concentrations in AB-10BR have increased slightly since sampling was
initiated in 2016, and were consistent during the first three quarters of
2018, ranging from 267 µg/L in May 2018 to 273 µg/L in August 2018.
The most recent sample collected from AB-10BR indicated a sharp
increase in boron concentration (from 273 µg/L in August 2018 to 383 µg/L
in November 2018); future monitoring events will help evaluate whether
this increase is a significant trend.
Evaluation of the significance of trends will continue as additional groundwater
quality data from future monitoring events become available.
3.5 Dry Ash Landfill (Phase I) Water Quality
3.5.1 Site Conditions
The Dry Ash Landfill Phase I is an unlined landfill constructed under NCDEQ
Division of Solid Waste Permit No. 1804-INDUS. The Dry Ash Landfill Phase I is
located east of the southern portion of the ash basin beyond the limits of the ash
basin waste boundary. The approximate boundary of the Dry Ash Landfill
Phase I is shown on (Figure 1-2). Placement of ash in the Dry Ash Landfill Phase
I began around September 1984 and continued until March 1986.
The Dry Ash Landfill Phase I is outside the limits of the former perennial stream
valley described in the updated CSM. Therefore, this landfill is not subject to the
lateral flow conditions restricting downward vertical migration of COIs into the
underlying aquifer. The landfill is downgradient of the ash basin between the
ash basin pond and the unnamed tributary to Lake Norman. The current
distribution of COIs attributable to the Dry Ash Landfill Phase I are indiscernible
from the COI plume attributable to the ash basin. Because the Dry Ash Landfill
Phase I boron plume comingles with the ash basin boron plume which migrates
from the basin to the west towards the adjacent drainage valley (unnamed
tributary) to Lake Norman, this landfill is considered a contributing source to the
ash basin plume in the vicinity of the landfill. The migration of the boron plume
in this area is consistent with inferred groundwater flow direction from
groundwater water level and contour maps presented in Figures 3-1 to 3-3,
which depict groundwater flow from the ash basin towards the unnamed
tributary to Lake Norman in the vicinity of the Dry Ash Landfill Phase I.
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3.5.2 Constituent Occurrence and Plume Status
The geomean of the four quarters of boron data was used to evaluate the COIs in
groundwater in the area. Boron is used to delineate the groundwater plume
beneath the Dry Ash Landfill Phase I because it is considered an indicator
constituent for groundwater influence from CCR.
Figures 3-12, 3-13, and 3-14 are isoconcentration maps illustrating the occurrence
of boron in the respective shallow, transition zone/deep, and bedrock flow zones
at the Site.
Boron detections associated with the Dry Ash Landfill Phase I are indiscernible
from boron detections attributable to the ash basin. The current plume geometry
is consistent with plume geometry presented in the 2018 CSA Update.
Because of its location outside of the lateral flow of the former perennial stream
valley, concentrations of boron in the transition/deep flow zone (MW-14D, AL-
1D, and GWA-11D) between the ash basin and the unnamed tributary to Lake
Norman are likely attributable to the Dry Ash Landfill Phase I.
Boron in the bedrock flow zone in the vicinity of the Dry Ash Landfill Phase I,
GWA-11BR, is less than 50 µg/L. Other boron detections in MW-14BR (121 µg/L)
and AL-1BR (581 µg/L) are greater than the BTV, but less than the 02L standard.
Monitoring wells AL-1BRL (265-275 ft bgs) and MW-14BRL (288-298 ft bgs) were
installed in 2018 to further evaluate the vertical extent of COI migration
downgradient from the Dry Ash Landfill Phase I. These wells are scheduled to
be sampled in 2019, and an evaluation of the results will be presented in future
reporting.
Time series graphs for select monitoring well clusters downgradient of the Dry
Ash Landfill Phase I are provided on Figure 3-21. These wells were selected to
illustrate boron occurrence adjacent to and downgradient from the Dry Ash
Landfill Phase I where boron concentrations have been observed in transition
zone/deep and bedrock flow zones. Review of the concentration trends in these
wells provides the following observations:
• Boron concentrations downgradient of the Dry Ash Landfill Phase I in the
shallow flow zone are generally consistent, with increasing concentrations
in co -located deep and bedrock flow zone wells AL-1D and AL-1BR. The
observed trends may be attributable to COI migration from the Dry Ash
Landfill Phase I.
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• Boron concentrations are decreasing in shallow and transition zone wells
MW-14S and MW-14D. Boron concentrations in MW-14BR appear to be
gradually increasing since 2016, however the highest concentration (156
µg/L in November 2018) is still less than the 02L standard. This indicates a
potential downward migration of COIs into the bedrock flow zone at
MW-14BR.
Evaluation of the significance of the trends will continue as additional
groundwater quality data from future monitoring events become available.
3.6 Photovoltaic Farm Structural Fill Water Quality
3.6.1 Site Conditions
The photovoltaic farm structural fill (PV structural fill) was constructed of fly
ash, under the structural fill rules found in 15A NCAC 13B .1700 et seq., and
bottom ash, under Duke Energy's Distribution of Residuals Solids Permit issued
by NCDENR DWQ, and is located adjacent to and partially on top of the
northwest portion of the ash basin. Placement of dry ash in the structural fill
began in October 2000. The structural fill is unlined and was completed and
closed with a soil cover system in February 2013.
The PV structural fill is partially outside the limits of the former perennial stream
valley described in the updated CSM. Therefore, the PV structural fill is not
completely subject to the lateral flow conditions limiting downward vertical
migration of COIs into the underlying aquifer.
Boron concentrations greater than the 02L standard beneath the ash basin at the
AB-6 location are greater than concentrations detected in co -located ash pore
water well AB-6S. Based on this observation, boron detections observed in AB-
6D may be attributable to COI migration from the PV structural fill.
NCDEQ requested further assessment of the PV structural fill, which is ongoing
in accordance with the approved work plan. The results of this assessment will
be presented at a later date.
3.6.2 Constituent Occurrence and Plume Status
The geomean of the four quarters of boron data was used to evaluate
groundwater in the area. Boron is used to delineate the groundwater plume
beneath the PV structural fill because it is considered an indicator constituent for
groundwater influence from CCR.
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Figures 3-12, 3-13, and 3-14 are isoconcentration maps illustrating the occurrence
of boron in the respective shallow, transition zone/deep, and bedrock flow zones
at the Site. As shown on the figures, boron concentrations above 02L standards
are only observed in the bedrock flow zone at the AB-6 monitoring well cluster.
The current boron plume geometry associated with the PV structural fill is
consistent with boron plume geometry presented in the 2018 CSA Update.
Boron concentrations greater than the 02L standard occur in one well
downgradient from the PV structural fill in the bedrock flow zone (AB-6D; 5,376
µg/L). Boron concentrations less than the 02L standard in adjacent bedrock well
AB-6BRA, and no detections of boron in lower bedrock well AB-6BRL, indicate
boron concentrations decrease with depth at this location. Limited data
currently exists to further evaluate groundwater effects that may be associated
with the PV structural fill. Additional assessment of the PV structural fill is
ongoing, and the results of these efforts will be presented in future reporting.
Time series graphs for the AB-6 monitoring well cluster associated with the PV
structural fill are provided on Figure 3-22. The AB-6 well cluster was chosen to
represent boron occurrence downgradient from the PV structural fill. Review of
the concentration trends in these wells provide the following observations:
Boron concentrations in ash pore water well AB-6S have been relatively
consistent over time leading up to the 2018 CAMA monitoring. Boron
concentrations decreased from 4,480 µg/L in February 2018 to 514 µg/L in
May 2018. Since May 2018, boron has gradually decreased to 345 µg/L in
August 2018, and 235 µg/L in November 2018.
The highest concentration of boron was detected in bedrock monitoring
well AB-6D (6,010 µg/L) in February 2018. The concentrations of boron in
AB-6D during the 2018 CAMA monitoring are consistent with historical
results, and no trends are apparent.
Boron concentrations in lower bedrock monitoring well AB-6BR have
remained below the 02L standard since monitoring began.
AB-6BRA was installed in mid-2017 to replace AB-6BR. Concentrations of
boron in AB-6BRA are generally higher than concentrations observed
historically in AB-6BR and are likely due to the screened interval in AB-
6BRA (107.93 to 112.93 ft bgs) situated above the screened interval of AB-
6BR (116.79 to 121.79 ft bgs). The greater boron concentrations observed
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in AB-6BRA when compared to AB-6BR is attributed to higher boron
concentrations observed in shallower bedrock well AB-61).
The highest concentration of boron in AB-6BRA (1,210 µg/L) was observed
in February 2018. Concentrations of boron in AB-6BRA decreased from
February 2018 to 644 µg/L in May 2018, 374 µg/L in August 2018, and 310
µg/L in November 2018.
There is currently limited data for further evaluation of groundwater migration
associated with the PV structural fill. Evaluation of the significance of trends
will continue as additional groundwater quality data from the ongoing
assessment and future monitoring events become available.
3.7 Unlined Structural Fill beneath Industrial Landfill No. 1 Water
Quality
3.7.1 Site Conditions
This structural fill was constructed under the same regulations as the PV
structural fill as a foundation for the double -lined Industrial Landfill No. 1 (ILF,
Solid Waste Permit No. 1812-INDUS-2008), which is located north of the ash
basin. This structural fill is almost entirely covered by the double -lined ILF, and
is anticipated to be completely capped with an extension of the ILF in the future.
The location of the unlined structural fill beneath Industrial Landfill No. 1 is
upgradient of the former perennial stream valley. Therefore, this structural fill is
not subject to the lateral flow conditions limiting downward vertical migration of
COIs into the underlying aquifer.
As requested by NCDEQ and in accordance with the approved work plan, a
three -well cluster downgradient of the structural fill has been installed in 2019 to
support ongoing assessment of the area. Results of data from those wells will be
presented at a later date.
3.7.2 Constituent Occurrence and Plume Status
The geomean of the four quarters of boron data was used to evaluate the Site -
specific COIs in groundwater.
Figures 3-12, 3-13, and 3-14 are isoconcentration maps illustrating the occurrence
of boron in the respective shallow, transition zone/deep, and bedrock flow zones
at the Site.
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
Boron is not detected in transition/deep flow zone monitoring well AB-17D.
There are currently no other groundwater monitoring wells are present for
further evaluation of groundwater in the vicinity of the unlined structural fill
beneath Industrial Landfill No. 1. Due to the absence of data, time series graphs
were not generated to evaluate this potential source area. The assessment of the
unlined structural fill beneath Industrial Landfill No. 1 is ongoing, and the
results of those assessment efforts will be presented in future reporting.
3.8 Access Road Structural Fill
3.8.1 Site Conditions
This structural fill was constructed of fly ash under the structural fill rules found
in 15A NCAC 13B .1700 et seq. The access road structural fill contains
approximately 128,000 cubic yards of fly ash and was completed in June 1998.
The location of the access road structural fill is adjacent to the western portion of
the ash basin and south of the PV structural fill. Groundwater flow beneath this
structural fill is typically to the east towards the ash basin.
3.8.2 Constituent Occurrence and Plume Status
The geomean of the four quarters of boron data was used to evaluate the Site -
specific COIs in groundwater.
Figures 3-12, 3-13, and 3-14 are isoconcentration maps illustrating the occurrence
of boron in the respective shallow, transition zone/deep, and bedrock flow zones
at the Site.
Boron is detected in bedrock monitoring well AB-61) (5,376 µg/L) above the 02L
standard, and in AB-6BRA (548 µg/L) above the BTV. The AB-6 well cluster is
located approximately 200 feet north of the access road structural fill. Based on
its location, the boron concentrations detected in the AB-6 well cluster may be
attributable to the access road structural fill.
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
4.0 SUMMARY AND CONCLUSIONS
4.1 Groundwater Occurrence and Flow
A common finding from predictive groundwater flow and transport modeling is that
reducing the hydraulic head in the ash basin through decanting will reduce the vertical
and horizontal hydraulic gradients that drive constituent migration, with the greatest
reduction near the dams.
The data presented in this report supports the findings that:
• The basin is a flow -through system with a dominant horizontal component of
flow and limited downward vertical migration of COIs into the underlying
aquifer upgradient from the dam.
• Near the dam, COIs flow downward out of the basin and under the dam.
• Downstream of the dam, the hydraulic gradient causes upward flow to
groundwater discharge zones (i.e., Lake Norman). This limits downward vertical
migration of COIs to the area in close proximity to the dam, as well as some
limited areas discussed below.
• Multiple years of groundwater level and quality data demonstrate that COI
transport is to the east and southeast along the impounded historical perennial
stream (Holdsclaw Creek) towards Lake Norman and an unnamed tributary.
The Dry Ash Landfill Phase I, Dry Ash Landfill Phase II, PV structural fill, unlined
structural fill beneath Industrial Landfill No. 1 and access road structural fill are located
outside the perennial stream valley described in the updated CSM, and are therefore
not subject to the lateral flow conditions associated with the ash basin.
4.2 Groundwater Quality
The following are conclusions pertaining to groundwater quality attributed to effects
from the ash basin:
• Boron concentrations define CCR influence on groundwater at the Site.
• The current boron plume geometry is consistent with plume geometry defined
during 2018 CSA update activities.
• Plume migration along the leading edge towards the unnamed tributary to Lake
Norman beyond the compliance boundary is generally confined to the shallow
flow zone.
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
• Boron occurrence in the shallow, deep, and bedrock flow zones confirm concepts
of the CSM.
• Boron concentrations in bedrock flow zone wells are greater than the 02L
standard in the northern portion of the ash basin dam.
The following are conclusions pertaining to groundwater quality beneath the additional
source areas:
• Boron concentrations define CCR influence on groundwater at the Site.
• The current plume geometry associated with each additional source is consistent
with plume geometry defined during 2018 CSA update activities.
• The plume beneath the Dry Ash Landfill Phase I is indiscernible from the plume
attributed to the ash basin. This landfill is considered an additional contributing
source of COIs to the ash basin plume.
• The plume beneath the Dry Ash Landfill Phase II is generally confined within the
borders of the landfill, with potential migration in the bedrock flow zone to
downgradient areas beneath the ash basin (e.g., AB-10D and AB-12D).
• Boron detections at the AB-6 location may be attributable to COI migration from
the PV structural fill and the access road structural fill.
• The Dry Ash Landfill Phase II and the PV structural fill are considered to be
additional sources of COIs at the Site that are coincident to the ash basin plume.
• Assessment of the additional source areas coincident to the ash basin is ongoing
in 2019, with results to be presented in the future.
Page 4-2

2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
5.0 INTERIM MONITORING PLAN UPDATES
5.1 Optimization of the Monitoring Program
Duke submitted an optimized IMP to NCDEQ on December 15, 2018. NCDEQ
approved the optimized IMP via email on December 21, 2018. The plan recommended
adjusting the well and water quality parameter lists to more efficiently monitor
groundwater conditions at the Site. After additional correspondence and discussion
with NCDEQ, Duke submitted a revised optimized IMP on March 20, 2019, which was
approved on April 4, 2019 (Appendix E).
IMP analytical parameters were reduced to include the Site COI list and the federal
CCR Rule Appendix III and IV parameter lists beginning Quarter 1 of 2019. A summary
of the rationale for reducing the IMP well counts is provided below.
Wells critical to the IMP were identified in the following locations:
• Between CCR source areas and downgradient surface water bodies.
• At the Site compliance boundary to verify plume stability.
• At existing plume boundaries to detect plume expansion or contraction.
• Along geochemical flow transects to monitor plume stability, support the
geochemical model, and confirm horizontal and vertical distribution trends.
• Adjacent to active construction activities to verify plume stability and detect
potential changing Site conditions
The IMP well list was divided into quarterly and semiannual sampling schedules for
2019. For 2019, Site wells are planned to be sampled in the following manner:
• Background wells - semiannually
• Peripheral monitoring wells - semiannually
• Wells along flow transect - semiannually
• Downgradient wells used in model simulations - semiannually
• Wells with increasing COI concentrations - quarterly
• Wells adjacent to active construction activities - quarterly
New wells installed as part of the CAMA program will be monitored quarterly for the
full suite of CAMA parameters listed in the original IMP. Additional voluntary
parameters will also be collected to facilitate geochemical modeling at the Site. After
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
four quarterly events, Duke Energy will re-evaluate the monitoring requirements for
the new wells and submit a recommendation to NCDEQ regarding future monitoring
requirements.
The data evaluation in this annual report confirms the IMP for 2019 is appropriate. No
additional changes to the IMP are recommended at this time. It is recommended that
sampling continue in accordance with the IMP.
5.2 2019 Monitoring and Reporting Schedule
Duke Energy plans to sample the monitoring well network on a quarterly and
semiannual basis during 2019 in accordance with the optimized IMP outlined above.
New wells installed throughout the year are anticipated to be added to the monitoring
network and quarterly sampling program. To maximize data available for evaluation in
the CAP, an initial sample is collected from new wells after development has been
completed and verified (i.e., turbidity <10 NTU 24 hours after development).
Depending on timing of initial sample collection, variances in quarterly sampling
schedule may be requested to avoid collection of auto -correlated data. In general, the
sampling events are anticipated to occur in accordance with the following schedule:
• Quarter 1 (wells sampled semi-annually and quarterly): February 2019
• Quarter 2 (wells sampled quarterly): May 2019
• Quarter 3 (wells sampled semi-annually and quarterly): August 2019
• Quarter 4 (wells sampled quarterly): November 2019
A quarterly, comprehensive data submittal to NCDEQ is planned to occur
approximately 60 days from data collection, in accordance with the following schedule:
• Quarter 1: April 2019
• Quarter 2: July 2019
• Quarter 3: October 2019
• Quarter 4: January 2020
(February 2019 data)
(May 2019 data)
(August 2019 data)
(November 2019 data)
Data from the IMP will support groundwater quality, occurrence, and flow evaluations
pertaining to the Site.
The list of Site -specific COIs for inclusion into the CAP is currently undergoing review
using the COI management approach presented to the NCDEQ on March 15,
2019. COIs proposed for management under the CAP would be based on:
Page 5-2

2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
• Comparing constituent concentrations to regulatory standards and/or
background values
• Evaluating each constituent's relative mobility
• Reviewing constituent distribution in groundwater based on geochemical
conditions
• Comparing each constituent's relative concentration observed in ash pore water
to the concentration observed in groundwater
• Evaluating constituent concentration trends over time
The results of this review will be presented in the CAP and may result in proposed
modifications to the monitoring program at that time.
Page 5-3

2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
6.0 REFERENCES
Daniel, C.C., III and Dahlen, P., 2002. Preliminary hydrogeologic assessment and study
plan for a regional ground -water resource investigation of the Blue Ridge and
Piedmont Provinces of North Carolina. U.S. Geological Survey; 2002:60.
Harned, D., and Daniel, C., 1992. The transition zone between bedrock and regolith:
Conduit for contamination. In Daniel, C.C., White, R., and Stone, P., eds.,
Groundwater in the Piedmont, Proceedings of a Conference on Ground Water in
the Piedmont of the Eastern United States, Charlotte, N.C., Oct. 16-18, 1989.
Clemson, SC: Clemson University (336-348).
Duke Energy, June 10, 2015. Low Flow Sampling Plan, Duke Energy Facilities, Ash
Basin Groundwater Assessment Program, North Carolina.
General Assembly of North Carolina, 2014. Coal Ash Management Act of 2014. Senate
Bill 729, Ratified Bill (Session 2013) (SB729).
Falta Environmental (2018). Preliminary Updated Groundwater Flow and Transport
Modeling Report — Marshall Steam Station — 2018. Falta Environmental, SynTerra,
and FRx, Inc.
HDR. (2015a). Comprehensive Site Assessment Report- Marshall Steam Station Ash Basin —
September 8, 2015a. HDR.
HDR. (2015b). Corrective Action Plan Part 1- Marshall Steam Station Ash Basin — December
7, 2015b. HDR.
HDR. (2016a). Corrective Action Plan Part 2 (included CSA Supplement 1 as Appendix A) -
Marshall Steam Station Ash Basin —March 3, 2016a. HDR.
HDR. (2016b). Comprehensive Site Assessment Supplement 2 - Marshall Steam Station Ash
Basin — August 4, 2016b. HDR. (U.S. Department of Agriculture, 1975)
Izquierdo, Maria and Querol, X., 2012. Leaching behaviour of elements from coal
combustion fly ash: an overview. International Journal of Coal Geology 94 (2012):
(pp. 54-66).
LeGrand, H. (1988). Region 21, Piedmont and Blue Ridge. In: J. Black, J. Rosenshein, P.
Seaber, ed. Geological Society of America, 0-2, (pp. 201-207).
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
LeGrand, H. (1989). A conceptual model of ground water settings in the Piedmont
region, in groundwater in the Piedmont. In: Daniel C., White, R., Stone, P., ed.
Ground Water in the Piedmont of the Eastern United States (pp. 317-327).
Clemson, SC: Clemson University.
LeGrand, H. E. 2004. A Master Conceptual Model for Hydrogeological Site
Characterization in the Piedmont and Mountain Region of North Carolina, A
Guidance Manual, North Carolina Department of Environment and Natural
Resources Division of Water Quality, Groundwater Section.
Multi -Agency Radiological Laboratory Analytical Protocols Manual (MARLAP), July
2004. MARLAP Manual Volume I: Chapter 8, Radiochemical Data Verification
and Validation.
NCDEQ, May 1, 2017. Correspondence to Duke Energy, Subject: Response to the
February 2, 2017 Letter from Duke Energy, Revised Interim Monitoring Plans for
14 Duke Energy Facilities.
NCDEQ, August 17, 2018. Correspondence to Duke Energy, Subject: 2018
Comprehensive Site Assessment Update Comments — Marshall Steam Station.
NCDEQ, September 28, 2018. Correspondence to Duke Energy, Subject: Revised Interim
Monitoring Plans for 14 Duke Energy Facilities, 4t11 Quarter 2018.
Pierce, W. G. (1944). Cobalt -Bearing Manganese Deposits of Alabama, Georgia, and
Tennessee. Strategic Minerals Investigations, 1943 (pp. 265-285). Washington D.C.:
United States Department of Interior -Geologic Survey.
Polizzotto, M., Amoozegar, A., Austin, R., Bolich, R., Bradley, P., Duckworth, O., &
Hesterberg, D. (2015). Surface and Subsurface Properties Regulating Manganese
Contamination of Groundwater in the North Carolina Piedmont. Raleigh, NC: UNC-
WRRI.
Schaeffer, M. F., April 2014a. Piedmont groundwater system, Part 1 - The transition
zone between regolith and bedrock: Existence. Geological Society of America,
Abstracts with Program, 46 no. 3, 26-27.
Schaeffer, M. F., April 2014b. Piedmont groundwater system, Part 2 - The Transition
zone between regolith and bedrock: Characteristics. Geological Society of
America, Abstracts with Program, 46 no. 3, 27.
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
SynTerra. (2018). Comprehensive Site Assessment Update, Marshall Steam Station —
January 31, 2018. Terrell, NC.
SynTerra. (2018). Comprehensive Site Assessment Update — Marshall Steam Station — January
2018. Terrell, NC
SynTerra. (2019a). Ash Basin Pumping Test Report —Marshall Steam Station —January
2019a. Terrell, NC
SynTerra. (2019). Surface Water Evaluation to Assess 15A NCAC 02B.0200 Compliance for
Implementation of Corrective Action Under 15A NCAC 02L.0106 W and (l) —March
2019. Terrell, NC
United States Environmental Protection Agency, November 2002, Guidance on
Environmental Data Verification and Data Validation.
United States Environmental Protection Agency, January 2017a. National Functional
Guidelines for Organic Superfund Methods Data Review.
United States Environmental Protection Agency, January 2017b. National Functional
Guidelines for Inorganic Superfund Methods Data Review.
United States Environmental Protection Agency, November 2018 (Phase I) and July
2018 (Phase II). Test Methods for Evaluating Solid Waste: Physical/Chemical
Methods (SW-846), Update VI.
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2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
FIGURES

Q
!r INDUSTRIAL
LANDFILL #1
ISLAND•POINTIRP
�J� _ _ � LANDFILL COMPLIANCE
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( LANDFILL COMPLIANCE
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SOURCE:
2016 USGS TOPOGRAPHIC MAP, TROUTMAN & LAKE NORMAN
NORTH QUADRANGLE, OBTAINED FROM THE USGS
STORE AT https://store.usgs.gov/map-locator.
10 CATAWBA
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FIGURE 1-1
SITE LOCATION MAP
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC
TERRELL NORTH CAROLINA
DRAWN BY: B. YOUNG DATE: 4/25/2019 Lao. Q Laoa
PROJECT MANAGER: B. WILKER CONTOUR INTERVAL: 20 FT
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GWA-11 S
--�--
AB-12S ----A---
AB-1BRLL
GWA-4D
- -
- AB-12SL
- - -
- AB-1 BR
- -
- GWA-4S
AB-15BR
AB-1 D
-0
MW-4
- -� -
AB-15D
- -0--
AB-1 S
- -
MW-4D
- -
AB-15S
GWA-11 BR
Notes:
1. Hydrographs are drawn from water levels measured in the field
at each monitoring well during routine monitoring events.
2. All water levels are in feet (ft), NAVD 88.

r s.
7Lalldl"Il
d
ILF ti _
structural r ` 1 No. 1 i
fill = 11
Dry Ash
Landfill
Phase II c1 S 1
f _ PV structural
fill
Dry Ashy_
Landfill Phase I
4 7 �� ti -•� '� ' `! s . J � .. aT~- �lJ S r• 5q 1 6 � J 1 �.t\: 1 y _ Y �
-. � — •. � � � r y � � l i frd - �i''�� � � r 1 � f � I r (1 S 1 l \ �" ,; t '. �..� l
�
Active Ash ,
J �_ r Basin
'.J J ' • Access road - ,�, ti - � , ' f r r f f
structural fill
Ash Basin
Dam
L ! 1 I 4 u\ I 1 `]�l ` S ti � I� � +. `� .i 1 � ti '?�` \ �• •'� � ) 7 1 t / Y~
Notes:
Velocity Magnitudes in feet per day (ft/day).
Velocity vectors are in three dimensions.
Velocity vector directions shown as black arrows.
Source: Preliminary Updated Groundwater Flow and Transport Modeling Report for Marshall Steam Station, Terrell, NC, November 2018 (Falta et al., 2018)
LEGEND
141 RIVER STREET, SUITE 220
'
0 — 0.001 ft/day 0.2 — 0.3 ft/day
GREENVILLE, SOUTH CAROLINA 29601
PHONE: [phone]
FIGURE 3-5
' 0.001 — 0.01 ft/day' 0.3 — 0.4 ft/day
synTerra
www.Y`era`orP.`om
FLOW VELOCITY
LOCITY VECTORS AND
0.01 — 0.05 ft/day 0.4 — 0.5 ft/day
SHALLOW FLOW ZONE
2018 CAMA ANNUAL INTERIM
DRAWN BY: J. EBENHACK
' 0.05 — 0.075 ft da '
/ y o.5 - l.o ft/day
MONITORING REPORT
r' DUKE
PROJECrMANAGER: B.WILKER
CHECKED BY: B.WYLIE
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC
' 0.075 — 0.1 ft/day' 1.0+ ft/day
�. ENERGY
DATE: 4/11/2019
a
TERRELL, NORTH CAROLINA
CAROLINAS
0.1 — 0.2 ft/day

r- ? Industrial ` }
ILF J _ • Landfill No. 1 ` r
structural 1 ,^ .•! ' I si'� —
_�R�
ry I f i r '�•� � \ a `` �' 1 1� � � `\\ \ \ �\ySti\\�.\.� \1� I �.J��,1� � L
Dry Ash
Landfill \ "¢ \ • �' ,
r
_`. Phase II;�
PV structural rr`I 1 s k��tti;\'\`• y' t I
1 fill ��: sj.
r ; z4� �Z ^`- - f ! a ! 11 . Dry Ash�N 1.
�F "�� f — �° y! 1•f ~ti! �y Landfill Phase I �� -- _'•
t+~r ` 4 ' J �l. T r '.��` •tF Mfw.+' w 1 r f!I � �,`k 1L { .,r� _ ,
C �� .t r l +
-2.i
af' Lr r: rr �� r, r r %j Active Ash t
Access road ' ��^ i ` rrrr Basin '{
structural fill
! {, r� • l \� ter, w' 1 � ay \ l � ;'
; Ash Basin
Dam
r ! b x�! 1 ' 1 �,��ti� � •`\l\L\ti ti Lys\1ti~'~ ' ��1��`t 1� >> ` ti i r r ; 4 �,
� � `: � 1 1 . � �' lr �t-�,•,�b� � �_�, � ',4, • ,\\\, 1\ =-ti'� `� \ �, � � ti l I t r � a
Notes:
Velocity Magnitudes in feet per day (ft/day).
Velocity vectors are in three dimensions.
Velocity vector directions shown as black arrows.
Source: Preliminary Updated Groundwater Flow and Transport Modeling Report for Marshall Steam Station, Terrell, NC, November 2018 (Falta et al., 2018)
LEGEND
'
0 - 0.001 ft/day 0.2 - 0.3 ft/day
141 RIVER STREET, SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHONE: [phone]
FIGURE 3-6
' 0.001 - 0.01 ft/day' 0.3 - 0.4 ft/day
synTerra
www. Y`erta`orP.`om
FLOW VELOCITY
LOCITY VECTORS AND
0.01 - 0.05 ft/day 0.4 - 0.5 ft/day
DEEP FLOW ZONE
2018 CAMA ANNUAL INTERIM
r'
DUKE �. ENERGY
a
DRAWN BY: J. EBENHACK
PROJECrMANAGER: B.WILKER
CHECKED BY: B.WYLIE
DATE: 4/11/2019
' 0.05 - 0.075 ft da '
/ y o.5 - l.o ft/day
' 0.075 - 0.1 ft/day' 1.0+ ft/day
MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC
TERRELL, NORTH CAROLINA
CAROLINAS
0.1 - 0.2 ft/day

'' �— 1'� Industrial S I
ILF 1 I`
r .r� struct ral 1 Landfill No 1 r.l�11
r;rittt,i
fill
aI{����r L L s 1 - .J��.'-.•'• F- y � '• I
k ♦ �� �`��- .ti , t" `1�; :,ram i.' 4 a •. i [ � , } y iLL.— •
Af ,lr -'r.. 1 � ♦ SL1 ,�,` �y r ..:�1 '.,♦♦�tisti tis ♦♦,♦�L Lit �.i�' 1 1 __} _
�p - ti s � ..�, \ �, 111, S 11 ♦�til `•`ti�`� �:,`♦♦1 \\.L\4`♦yiti � - -- '
' i yr � `�' - .c, '' 1 r 1 ! \ 1 l 1 ♦♦ \ 11 1 ♦♦ 1 :.�. 1 y 1
Dry Ash �♦ ♦. .tititi♦`♦` l♦ti 1 1 \
Landfill
" PV structural Phase II t' Y +, `111•,�L�`♦`Ly�ti r. ` 1 1
fill ��� _rt ' r/1!1 !1 L � t`: ,•'•` Y ; J
Dry Ash.
,.' ° _ _ 17^ --•\> ! r 1 lr! Landfill Phase
rLI. ~' rr "'�r rf�l`J , y •f/fJl1LI1L\�1` \
e�o- i.�_, i �' r r `l •'�� �r rll \1 ���±� 'C' 1 / ! 1 1 1, .
f `�
r; � � h� . r y�~Y r^ `'�lV �r A'�'rr"f�''.•�� f' �� � i + f l - f• � V-
'Active Ash r
! ♦ r
Basin - •r� ` ---..
1 pu Access road
f ! ! structural fill ^ ' r r rf .' 1LLe Ash Basin
~ ti
s r J 1 i 1 11 ` `` 1~♦ti, � � � ti \�ti` \ \'*, rt ti ,�. ��',� K �ti :� ^�� 1 � 7 r ". "
r r ✓ �'J Jam! 1 �♦ l 1'S•`�S♦`S�ti� `'� �1.♦ ♦♦♦♦.tip', ��.ti,� ti ti� ` •`� � ) yr-,� 11 S r � .
s f f J ! i 1 `. S 1, ~ 5`111~1~ y� � `a'y♦♦, ,♦♦LSS```ti \,, ~ ~y'~, .- ~�1,11(1Ir'®y�, � 1 r J f r �i..--4` "'
- r r .o+ 1 �."y `�1 `♦♦♦.�'�� y\~11♦i.V♦y♦L>�ti`n .sti �',��51�11�ti1 ��' �^,
y 'cobS \ "�! ` 1 t1 r �-.� \ i ` ♦ ♦ ♦ \ �\ ♦~ ♦ ��•'r` { �ti`'`�,�1 y 111 ,rTw f r�
r r ✓ f J^ .- �\�. � � � r r -� j. S ��:..ti-' -� ,. � \ i.f'�R. '�i�� ' - r L�,t
Notes:
Velocity Magnitudes in feet per day (ft/day).
Velocity vectors are in three dimensions.
Velocity vector directions shown as black arrows.
Source: Preliminary Updated Groundwater Flow and Transport Modeling Report for Marshall Steam Station, Terrell, NC, November 2018 (Falta et al., 2018)
LEGEND
148 RIVER STREET, SUITE 220
'
0 - 0.001 ft/day 0.2 - 0.3 ft/day
GREENVILLE, SOUTH CAROLINA 11101
PHONE: [phone]
FIGURE 3-7
' 0.001 - 0.01 ft/day' 0.3 - 0.4 ft/day
synTerra
www.synterracorp.com
FLOW VELOCITY
LOCITY VECTORS AND
0.01 - 0.05 ft/day 0.4 - 0.5 ft/day
BEDROCK FLOW ZONE
2018 CAMA ANNUAL INTERIM
DRAWN By: J.
0.05 - 0.075 ft da
/ y 0.5 - l.o ft/day
MONITORING REPORT
r' DUKE
B.
PROIECTMANAGER B WICKER
MANAGER
CHECKED BY: B.WYLIE
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC
0.075 - 0.1 ft/day' 1.0+ ft/day
�. ENERGY®
DATE: 4/11/2019
TERRELL, NORTH CAROLINA
CAROLINAS
0.1 - 0.2 ft/day

Ash Basin Pond Ash Basin
Dam
�I t r r r • ,
PT
�� .�`° �`++-¢���� . �. � � � /°r° J' f! ! J %' J°l' .^ P ��J'J' J° 1, �,A y y 5° s e3tpa►yy � L L�� �1.�\��°���'j".��v�,J'i° l'� PR1 ti � ® a
� --wae �`°- "-_' � � � r' � rob y � `` �' �-° _--• ��d y p ~ 4
� ��.� �� �. � gyp• ~ � 'V il_s r1 �Y�� IT
`° �. b _-��o---d-."�' �' s+�,a �o- �.�c.r r ` �r��+�sa� �o�s. ��...e.. �b � -°+r. -�, -. ro ro v ti tea.. —may '� � � • � 0. a
� ~ Y � -e. v-.-..m. rms-�Tp �-asp•- -a
LEGEND
0 - 0.001 ft/day
0.001
- 0.01 ft/day
Source: Preliminary Updated Groundwater Flow and
Transport Modeling Report for Marshall
0.01 -
0.05 ft/day
Steam Station, Terrell, NC, November 2018
(Falta et al. 2018)
0.05 -
0.075 ft/day
Notes: Velocity Magnitudes in feet per day.
.0.075
— 0.1 ft/day
Velocity vectors are in three dimensions.
Velocity vector directions shown as black arrows.
10.1 - 0.2 ft/day
0.2 —
0.3 -
0.4 -
0.5 -
0.3
0.4
0.5
1.0
ft/day
ft/day
ft/day
ft/day
'4'
synTerra
141RIVERSTREET,SUITE 220
GREENVILLE, SOUTH CAROLINA29601
PHONE: [phone]
—ynterracorp.com
FIGURE 3-8
FLOW VELOCITY VECTORS AND
MAGNITUDES THROUGH DAM
2018 CAMA ANNUAL INTERIM
MONITORING REPORT
MARSHALL STEAM STATION
�7 DUKE
DRAWN BY: J. Ebenhack DATE: 4/11/2019
PROJECTMANAGER: B.WILKER
1+
ft da
/ Y
CAROLINAS
CHECKED BY: G.BARRIER
DUKE ENERGY CAROLINAS, LLC
TERRELL, NORTH CAROLINA

A -
(NORTHWEST)
ACTIVE ASH BASIN
INDUSTRIAL LANDFILL o Lo `�� a v zoo m
ONO 00 06 O O N f0
Op do 00 00 00 CD
SAPROLITE
— — _ Z
FILL
-- �- -=-=--ASH
ASH PORE WATER= -
-
-� -_ ASH PORE WATER
TRANSITION ZONE -_-_
- - — _ _
SAPROLITE --
\I/1,
/I��li \ I-\/i \/li\li \ I-\/i \/li\li \ I-\/i \/li\li \ I-\/i \/li\li \ I-\/;�♦/li\/��♦/I-\/;�`/I�\/��♦/I-\/ice /I
BEDROCK" BE6ROCK I♦'\/\I/1//\/\I/\
\ I / 1 \ � \ / \I / 1 \ � \ / \ I / 1 \ � \ / \ I / 1 \ � \ / \ I / 1 \ � \ / \ I / 1 ♦ � \ / \I / 1 \ � \ / \I / 1 \ � \ / \ I / 1 \ � \ / \ I / 1 \ � \ / \ I / 1 \ � \ / \ I / 1 ♦ � \ / \I / 1 \ � \ / \I / 1 \ � \ / \ I / 1 \ � \ / \ I / 1 \ � \ / \ I / 1 \ � \ / \ I / 1
CROSS SECTION LOCATION
LEGEND
AV
MW-12S
WELL IN SAPROLITE MATERIAL
POW
ACTIVE ASH BASIN RER�LINE
ACTIVE ASH BASIN
(SOUTHEAST)
MW-16D
WELL IN TRANSITION ZONE
MW-16BR
WELL IN BEDROCK
ABMW-2
WELL IN ASH PORE WATER
I
GENERALIZED WATER TABLE
v F-N o cn rn
799.39'
WATER LEVEL
0)
f� N r
Eo
—o.
GENERALIZED GROUNDWATER
ul)
J O
Lo
06
FLOW DIRECTION
pp p In w
GENERALIZED ASH PORE WATER
N N N N
FLOW DIRECTIONco
m no Im m m 0
0
ASH
Q Q Q Q Q Q 00
00
ASH PORE WATER
ASH m
FILL
ASH BASIN DAM
I
r
SAPROLITE
LJ
: _-_-_-_-_-_- - — ---- - - -
®
TRANSITION ZONE
_ - -- ---------
LAKE NORMAN
BEDROCK
_ - - -- POREWA------ - -
=-ASH PORE WATER ---- ____________________________________________________________ FILL
_--_-_-_-_-_��_-=-=--ASH
---------
EL. 760
_ _ _ PORE WATER---=-_-_-_-_-_---
V
SHALLOW FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
H
Q
\ - _ _ _ _ _ _ _ _ _ _ _ _ _
DEEP FLOW LAYER GROUNDWATER
_ \' ♦ / � / - \ � _ \ � ♦ / '\ SAPROLITE Nunn*- -- --
TRANSITION ZONE
WELL WATER LEVEL ELEVATION
Ilk
BEDROCK FLOW LAYER GROUNDWATER
_ \ ♦ / , ♦ / _ _ \ . ♦ / / _ _ \ . ♦ / \ , ♦ / _ _ \ . ♦ / - \ ♦ / _ \ -
WELL WATER LEVEL ELEVATION
ASH FLOW LAYER
\- I / / - / \- l / / - l \ \- I / - / ♦ \- I / - / \- / / - / BEDROCK - / �� i \i l \ / I / \- l �� i \i l \ / I / \- l ��
\\i / I \ / I / \ / I / \ / I / \ /
i Ski\i
WATER LEVEL ELEVATION
\ _ \ ♦ /I _ I \ i \ I \ i \ I \ i \ I \ i \ . / \ \ \ �I ♦ /
/ / \ /- \ I ♦ /\ -/ . /\ \ \ �I ♦ / \ -/ ♦ / \ \ \ �I ♦ / \ -/ ♦ /\ \ \ �I ♦ /\ -/ . / \ \ \ �I ♦ / \ -/ ♦ / \ \ \ �I ♦ / \ -/ ♦ /\ \ \ �I ♦ /\ -/
\ -/ ♦ / \ \ \ �I ♦ /\ -/
\I \I \I \I \I \I \I \I
\I \I
BORON CONCENTRATION ug/L/\-
780.00'
WATER LEVEL
\/��
NM
NOT MEASURED
NOTES
HORIZONTAL GRAPHIC SCALE
1. DEPTH TO GROUNDWATER GAUGED IN MONITORING WELLS ON NOVEMBER 6, 2018. 200 0 200 400
2. CONCENTRATIONS ARE THE GEOMEAN FOR ALL SAMPLES TAKEN PER EACH SAMPLE LOCATION IN 2018. IN FEET
VERTICAL GRAPHIC SCALE
SOURCE INFORMATION: 40 0 40 80
ORIGINAL CROSS SECTION BASE OBTAINED FROM HDR, CSA SUPPLEMENT 2, DATED AUGUST 2016. IN FEET

(WEST)
ACTIVE ASH BASIN
V
co
60
V N
O
O
O
rl-
O
rl-
O
O O
00 co
O
N
V
O
W
V)
m
o
0
0
co
In
Ln
L17
L17
I
m
m
m
m
m
Q
Q
Q
Q
Q Q
Q
(n
N
N
ASH BASIN DAM —, m
m
Q
---
Q
--
-- �---��--- -----ASH-----
---
-
-------------- -
_-_-----------------
-
--- _ _
LAKE
_
----
------�r--------
---
--------------------�__�__---------------------------------
-------------
----------
-----------------------
NORMAN
-
--
-
----------------_-
--- -
- -----
--
--
--------_---
------ `-
L.7
-------
--
_
_ AS60
H PORE WATER .---_ -_
_
_ _ ------
SAPROLITE
- - - - - -___ -- - - - - - ---
---
--_---- - - ------ - --_-------
FILL
FTI
Bw
(EAST)
/\/\I/1\/ /\I\/\1/1\/ /\1 ♦�\/\1/1\/ /\I \/
TRANSITION --
ZONE SAPROLITE _
IBEDROCK,--� l i l \`/ I \ i l /�/ i l i l \\/ I \ i t \`/ i l i l �\/ I \ i t \`/ i l i l \`/ I \ i t / i l i l �\/ I:
\—\��/—l\i /1—\_♦��/—l\ice/1—\ ♦/�/—l\ice/1—\_\��/—�1—\_\/�/—ll i 1 \_ l \_ l\i /1—\—l\i /
\
HORIZONTAL GRAPHIC SCALE
200 0 200 400
IN FEET
LEGEND
VERTICAL GRAPHIC
4o oo$o
AB 2S
WELL IN SAPROLITE MATERIAL
SHALLOW FLOW LAYER GROUNDWATER
IN FEET
AB 5D
WELL IN TRANSITION ZONE
WELL WATER LEVEL ELEVATION
AB 5BR
WELL IN BEDROCK
DEEP FLOW LAYER GROUNDWATER
NOTES
AB 5S
WELL IN ASH PORE WATER
WELL WATER LEVEL ELEVATION
1. DEPTH TO WATER GAUGED IN MONITORING WELLS ON NOVEMBER 6, 2018.
•
GENERALIZED WATER TABLE
BEDROCK FLOW LAYER GROUNDWATER
2. BORON CONCENTRATIONS ARE THE GEOMEAN FOR SAMPLES COLLECTED IN 2018.
WELL WATER LEVEL ELEVATION
799.39'
WATER LEVELS
3. THE NORTH CAROLINA 2L FOR BORON IS 700 ug/L.
GENERALIZED GROUNDWATER
ASH FLOW LAYER
4. BACKGROUND THRESHOLD VALUE (BTV) FOR BORON IS 50 ug/L WITHIN THE SHALLOW,
mown
FLOW DIRECTION
WATER LEVEL ELEVATION
50Ug/LDEEP, 50Ug/LBEDROCK FLOW LAYERS.
GENERALIZED ASH PORE WATER
®1 BORON CONCENTRATION ug/L
5. ALL VERTICAL ELEVATIONS ARE MEASURED IN FEET, NORTH AMERICA VERTICAL DATUM (NAVD) OF 1988.
FLOW DIRECTION
0
ASH
780.00. WATER LEVEL
NM NOT MEASURED
- - - -
A
ASH PORE WATER
SOURCE INFORMATION:
FILL
ORIGINAL CROSS SECTION BASE OBTAINED FROM HDR, CSA SUPPLEMENT 2, DATED AUGUST 2016.
0
SAPROLITE
TRANSITION ZONE
BEDROCK
SCALE: AS SHOWN
FIGURE 3-10
CROSS SECTION LOCATION

C
(SOUTHWEST)
cn
0
co
�
c0
CD
0
co
�
0
TRANSITION ZONE
DUKEENERGY
PROPERTY
BOUNDARY
L
M V
O O
zT 'zT
00 00 '
(n ACTIVE ASH BASIN
cI cI o i� I
V r— cli
�
c cc co 0-)6 N
G G O W 0 00
M
cc
Of
Of
00 OO
cn CO
0
m
m
CO CO
CO
CO
CO
CO CO
m
CO
m
Q Q
Q
Q
Q
INNER
00 00 00
ASH
---------- -- -- --
--- --- -----
-
----
_ --
----------- ---
BASIN
Q Q Q
-
- _-
- ----- --- ASH --- -
_' -----_---
ROAD
----
-------'5�----
ASH PORE WATER
---
--------- -----
SAPROLITE
LEGEND
MW-12S
WELL IN SAPROLITE MATERIAL
MW-16D
WELL IN TRANSITION ZONE
MW-16BR
WELL IN BEDROCK
ABMW-2
WELL IN ASH PORE WATER
AB-66R
ABANDONED WELL
GENERALIZED WATER TABLE
799.39'
WATER LEVEL
GENERALIZED GROUNDWATER
N
FLOW DIRECTION
GENERALIZED ASH PORE WATER
Lu
FLOW DIRECTION
Z
0
ASH
J
0
ASH PORE WATER
=
FILL
0
SAPROLITE
a
®
TRANSITION ZONE
BEDROCK
V
SHALLOW FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
V
DEEP FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
V
BEDROCK FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
ASH FLOW LAYER
WATER LEVEL ELEVATION
®I
BORON CONCENTRATION ug/L
780.00'
WATER LEVEL
NM
NOT MEASURED
NOTES
1. DEPTH
TO WATER GAUGED IN MONITORING WELLS ON NOVEMBER 6, 2018.
2. BORON CONCENTRATIONS ARE THE GEOMEAN FOR SAMPLES COLLECTED IN 2018.
3. THE NORTH CAROLINA 2L FOR BORON IS 700 ug/L.
4. BACKGROUND THRESHOLD VALUE (BTV) FOR BORON IS 50 ug/L WITHIN THE SHALLOW,
50 ug/L DEEP, 50 ug/L BEDROCK FLOW LAYERS.
5. ALL VERTICAL ELEVATIONS ARE MEASURED IN FEET, NORTH AMERICA VERTICAL DATUM (NAVD) OF 1988.
SOURCE INFORMATION:
ORIGINAL CROSS SECTION BASE OBTAINED
FROM HDR, CSA SUPPLEMENT 2, DATED
AUGUST 2016.
HORIZONTAL GRAPHIC SCALE
200 0 200 400
IN FEET
VERTICAL GRAPHIC SCALE
40 0 40 80
IN FEET
CROSS SECTION LOCATION

■
• N •.. - { ♦ °� w '' � � � � w � � "idyl � �i
- . t-. �:. -• s Iti F
�^II III
E-\yli W- - � W �• 1} fl�� �.
0, . ti • �-
{ 1 1
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■, R ..
000Q
00
► _ �. ---
-. 4 0'm r
F r
4. ti
i a
'II'v.'r
El�
r 1
i \ III
F
,.
..■yt • y" ,•,,3 } ;.+ l : } ,'� • ` - r 5 500 0 500 1,000
- op GRAPHIC SCALE IN FEET � • �• . R . � � Y. �a .� ■ TCpI 1 ryer G 148 RIVER STREET, SUITE 220
r«_+ ,,,,,,fiIr S ♦ ..,,�� - �. f GREENVILLE, SOUTH CAROLINA 29601
PHONE[phone]
,�x!. _ ■ - (' DUKE
■ +. _y.
DRAWN BY: B. YOUNG DATE: 04/26/2019
t `� �' y _ - •' �', wf. - + ENERGY. PROJECTMANAGER: B.WILKER
41C,-' CAROLINAS CHECKED BY: E. KINSEY
r

... v • ram.. �..�. �+ � a
s ,
9
' ". n GWA 4D' ► �. GWA-5D 1�
Ap
x r •�-
'
GWA-14D GWA-3D . "��� � •
.. <50 - .
AB-18DW
<50
AL-3D
I
5138
MW-13D
+
i
F "ITT. ml
AL-41D
13909
}
i...
^•
Is
AL-21D
CCR-16D
.
r
11056
,
<50
re
GWA-7D
a
s.•4
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?
<50
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MW-12D
i
•'" �-
.� � ..
AB-14D
420
..1 ,
- _
~�
- -.
- -- -
'CCR-15D
can
215014D
• •� s
.. _
GWA-10D
�A illift"
FGWA-13DA -
<50
51
■
7�
AB-7D
A, <50
1
AB-21 D
MW-11 D <50
<50
• AB-4D
y 359
■ AB-5D
• + - CCR-10
<50
1 GWA-2DA*
• <50
- y
1 f q;.
, afi
�aMt
GWA-1 D
<50
.� CCR-31D
<50 •
.��+
FMW-9D
473
AB-2D
431
CCR-5D
<50
CCR-4D
<50
synTerra
(' DUKE
e' ENERGY.
CAROLINAS
FM
a r ,
a
500 0 500 1,000
GRAPHIC SCALE IN FEET
148 RIVER STREET, SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
www.s nterracor .com
DRAWN BY: B. YOUNG DATE: 04/26/2019
PROJECT MANAGER: B.WILKER
CHECKED BY: E. KINSEY
a*
p ,
1`
r
a �
1 � �
LEGEND
0
0
0
NOTES:
FIGURE 3-13
ISOCONCENTRATION MAP
GEOMEAN OF BORON IN DEEP FLOW ZONE
2018 CAMAANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC
TERRELL, NORTH CAROLINA

s <�c �.'�, _ + ■ 1• � GWA-8D ■ Y
.ro .. � . r i 1 <50 ■
r w BG3D
-
• ti�yt�,. MW-4D ,11 .4__ ....�♦�� <50
{ - • • • t AB-17D ~I BG-36R
''� • `" " BG-213R
GWA-6DQflloo<50
. s AB-18 D
<50
BG-1 BRA 'M1
• r
+ 1
1 �
• 1
rI
1
+
AB-16D AL-3BR -.�• <50 _ LEGEND
1 � 1165
AL-46R5L 4*
GWA-9BR ■ �• AL-4BR • AB-11D 0
<50 9185 • 56
AB-15D �y .. .. .. . , - .
�.i AB-20D 4 <50 •�
` 80 FAIL1 •x AB-15BR AL-2BR 2060 `
<50 4060
�5 AL-213RLL The •.
• 10169
X
AB-13D
<50 AB-10D r�
MW-14BR
r ♦ • • w„xi_ AB-12D 4 121
1 1191 AB-10BR
. .r 296
AB-126R
ti 59 AL-113R
AB-9D 581
AB-8D GWA-11BR
• _ A13-913R <50IL so
.
<50
•� �� ��
GWA-12DAB-6BRA* AB-6D
<50 ' 548 5376
GWA-12BR w��yy .4 • -
�-
'♦ MP
AB-1BR F
AB-1BRL �p 2558
2032
_! AB-1BRLL* r
! •� 1790 1
'. 7
MW3D �h.
1 AB-SBR
1 268
<50
I 1 ♦r
1 �, i 1 j ♦,
• ♦ �� GWA-1BR 1
t <50 IV
, •
•
500 0 500 1,000 FIGURE 3-14
.00 ► GRAPHIC SCALE IN FEET ISOCONCENTRATION MAP
1 A
�mTerrd 148 RIVER STREET, SUITE 220 GEOMEAN OF BORON IN BEDROCK FLOW ZONE
+♦ �' _,�, . r � �` ��
GHONE 64-421-rHCARouNA296o1 2018 CAMAANNUAL INTERIM MONITORING REPORT
PHONE [phone]
MARSHALL STEAM STATION
• ? - DUKE wRAW nterracor .com DUKE ENERGY CAROLINAS, LLC
• ' �� ENERGY.
DRAWN BY: B. YOUNG DATE: 04/2G/2019
1 � ENERG Iw PROJECT MANAGER: B. WICKER
CAROLINAS CHECKED BY: E.KINSEY TERRELL, NORTH CAROLINA

9000
8000
0) 7000
C: 6000
0
5000
c
4000
C
O
U 3000
2000
c 1000
0
U
40
20
0
1/1/15
2500
J
2000
C
O
AB-01 S AB-01 D i AB-01 BR
1/1/16 1/1/17 1/1/18
Time
AB-01 BRL
0 2
U
1
0
10/1/17 1/1/18 4/1/18 7/1/18 10/1/18
Time
1/1/19
1200
0 Boron
1000 -
17— Cobalt
Manganese
0)
800
0
600
�
400
(D
U
0
200
U
aa)
150
rn
0
100
U
50
0
1/1/15
2000
1900
1800
1700
O
1600
c
0
1500
O
U 1400
c
0
1300
c 2
O
U
1
0+_
8/1/18
1/1/16 1/1/17 1/1/18 1/1/19
Time
Reference
LEGEND
Boron
Cobalt
Manganese
Limits
Criteria
(ka/L)
(jig/L.)
(jig/L.)Reporting
Boron (pg/L) 50
2L
700
N/A
50
Cobalt (pg/L) 0.1
IMAC
N/A
1
N/A
Manganese (pg/L) 5
BTV (S)
50
1.2
75.3
BTV (D)
50
1.9
141
BTV (BR)
50
2.8
26.6
Notes: N/A = Not Applicable BTV =
Background Threshold Value S =
Shallow D = Deep/Transition Zone
BR = Bedrock IMAC = Interim Maximum
Allowable
Concentration
pg/L = micrograms per liter
mg/L. = milligrams per liter
AB-01 BRLL
9/1/18 10/1/18 11/1/18 12/1/18
Time
3600
3300
3000
2700
2400
0 2100
1800
1500
C
O 1200
U
c 900
600
c 300
O
U 6
4
2
0
* Boron
* Cobalt
—0--- Manganese
1/1/15 1/1/16 1/1/17
Time
148 RIVER STREET, SUITE 220
161P
GREENVILLE, SOUTH CAROLINA 29601
PHONE: [phone]
synTerrawww.synterracorp.com
DRAWN BY: H.Garrett DATE: 4/3/2019
f�
DUKE
�� DU
PROJECT MANAGER: B. Wilker
L
ENERGY-
CHECKED BY: G. Barrier
CAROLINAS
Not Applicable
1/1/18 1/1/19
FIGURE 3-15
TIME -SERIES PLOTS -
ASH BASIN (1)
2018 CAMA ANNUAL INTERIM
MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC
TERRELL, NORTH CAROLINA

10000
0)
c
0
0 10
U
1 +_
2007
MW-07S
--0— Boron
­v— Cobalt
--E]-- Manganese
2010 2013 2016 2019
Time
1600
1400
J
1200
c
O
1000
c
800
c
O
U 600
C
400
0 200 y
U 10
5
0
4/1/17
10/1/17
GWA-15S
4/1/18
Time
Boron
--V— Cobalt
--0-- Manganese
10/1/18
J
10000
c
0
C
a�
1000
0
IX
c
a�
c 100
0
U
10+_
2008
MW-06S
Boron
�— Cobalt
Manganese
2010 2012 2014
Time
■N
1uWE EI
2016 2018
MW-07D GWA-15D MW-06D
10000 1400 1000
1200 ❑ Boron
1000 ­v— Cobalt
_j —E]--- Manganese _j 100
0)
100 1000
0 o o ❑
o n
800
� 10 L L L
10 C C El(D❑
C C 600
O 0
U 1 U U
400 C 1 -4111- Boron
❑ ­v— Cobalt
0.1 a= Lp � Manganese
IVA 0
0 200 0
0 0.1
o Boron U n U
0.01 � Cobalt 0 -• •
�— Manganese
0.001 0.01
2007 2010 2013 2016 2019 8/1/18 9/1/18 10/1/18 11/1/18 12/1/18 2007 2010 2013 2016 2019
Time Time Time
Reference Boron Cobalt Manganese 148 RIVER STREET, SUITE 220
-16
LEGEND Criteria (L!q/L) (jig/L.) (jig/L.)Reporting Limits GREENVILLE, SOUTH CAROLINA 29601 FIGURE PLASH
Boron (pg/L) 5o PHONE:[phone] TIME -SERIES PLOTS -
2L 700 N/A 50 Cobalt (pg/L) 0.1 161P Terra
�m ASH BASIN 2
IMAC N/A 1 N/A Manganese (pg/L) 5 s7" www.synterracorp.com 2018 LAMA ANNUAL INTERIM
BTV (S) 50 1.2 75.3
BTV (D) 50 1.9 141 MONITORING REPORT
BTV (BR) 50 2.8 26.6 �' DUKE DRAWN BY: H.Garrett DATE: 4/3/2019 MARSHALL STEAM STATION
Notes: N/A = Not Applicable BTV = Background Threshold Value S = Shallow D = Deep/Transition Zone PROJECT MANAGER: B. Wilker
BR = Bedrock IMAC = Interim Maximum Allowable Concentration pg/L = micrograms per liter ENERGY- CHECKED BY: G. Barrier DUKE ENERGY CAROLINAS, LLC
mg/L. = milligrams per liter CAROLINAS TERRELL, NORTH CAROLINA

25000
20000
J
0)
0 15000
10000
0
U
5000
c
0
U 200
100
0
1/1/15
700
J
0) 500
c
0 400
ctf
L
300
U
C
0
U 200
c
a�
100
c
0
U 10
AB-05S
1/1/16 1/1/17 1/1/18 1/1/19
Time
0 i i iTi i iTi i 4Ti
1/1/15 1/1/16 1/1/17 1/1/18 1/1/19
Time
4500
4000
J
0) 3500
3000
L
2500
c
0
031111111111111116r
0
c
0 25
U
Reference
LEGEND
Boron
Cobalt
Manganese
Limits
Criteria
(ka/L)
(jig/L.)
(jig/L.)Reporting
Boron (pg/L) 50
2L
700
N/A
50
Cobalt (pg/L) 0.1
IMAC
N/A
1
N/A
Manganese (pg/L) 5
BTV (S)
50
1.2
75.3
BTV (D)
50
1.9
141
BTV (BR)
50
2.8
26.6
Notes: N/A = Not Applicable BTV =
Background Threshold Value S =
Shallow D = Deep/Transition Zone
BR = Bedrock IMAC = Interim Maximum
Allowable
Concentration
pg/L = micrograms per liter
mg/L. = milligrams per liter
AB-05DU
--0— Boron
--V-- Cobalt
—CF-- Manganese
9/1/18 10/1/18 11/1/18 12/1/18
Time
Not Applicable
14,
synTerra
V Af DUKE
'ENERGY
CAROLINAS
WIN
J
O7
1000
c
0
500
U
0 50
U
c 40
O
30
c
0
c) 20
10
0
1/1/15
148 RIVER STREET, SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHONE: [phone]
Boron
­v— Cobalt
—0— Manganese
1/1/16 1/1/17 1/1/18 1/1/19
Time
www.synterracorp.com
DRAWN BY: H.Garrett DATE: 4/3/2019
PROJECT MANAGER: B. Wilker
CHECKED BY: G. Barrier
Not Applicable
FIGURE 3-17
TIME -SERIES PLOTS -
ASH BASIN (3)
2018 CAMA ANNUAL INTERIM
MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC
TERRELL, NORTH CAROLINA

GWA-11 S I GWA-11 D I GWA-11 BR
3000
300
Boron
2900
1000
250 -
Cobalt
J
�
�
Manganese
2800
800
Boron
200
c
­v— Cobalt
c
0
0
Manganese
m
2700
2
600
m 150
C
c
02600
Boron
400
0
100
�— Cobalt
o
0
U
—0— Manganese
U
U
2500
a)
200
a) 50
.2
50
0
40
0
0
U
30
U
1
U 1
20
10
0
0
0
1/1/16
1/1/17
1/1/18
1/1/19
1/1/16
1/1/17 1/1/18
1/1/19 4/1/17
10/1/17 4/1/18 10/1/18
Time
Time
Time
Not Applicable
Not Applicable
Not Applicable
LEGEND
Reference
Boron Cobalt
Manganese
Limits
148 RIVER STREET, SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
FIGURE -18
Criteria
(6!cI/L) (jig/L.)
(jig/L.)Reporting
Boron (pg/L) 50
161P
PHONE:[phone]
TIME -SERIES PLOTS -
PLASH
2L
IMAC
700 N/A
N/A 1
50
N/A
Cobalt (pg/L) 0.1
�m
Terra
ASH BASIN 4
BTV (S)
50 1.2
75.3
Manganese (pg/L) 5
sT "
www.synterracorp.com
2018 LAMA ANNUAL INTERIM
BTV (D)
50 1.9
141
MONITORING REPORT
BTV (BR)
50 2.8
26.6
Af�L DUKE
DRAWN BY: H.Garrett DATE:
4/3/2019
MARSHALL STEAM STATION
Notes: N/A = Not Applicable
BTV =
Background Threshold Value S = Shallow
D = Deep/Transition Zone
ENERGY
PROJECT MANAGER: B. Wilker
CHECKED BY: G. Barrier
DUKE ENERGY CAROLINAS, LLC
BR = Bedrock
IMAC = Interim Maximum Allowable
Concentration pg/L = micrograms
per liter
mg/L = milligrams per liter
CAROLINAS
TERRELL, NORTH CAROLINA

12000
J
10000
C
° 8000
c
6000
0 1600
U
0 1200
C
0 800
U
400
2500
2000
J
1500
0 1000
M
c 500
0
U
0 30
U
(D
20
U)
C
0
U 10
0 -0—
12/1/16
AL-02S I AL-02D I AL-02BR
1/1/16 1/1/17 1/1/18 1/1/19
Time
AL-02BRL
6/1/17 12/1/17 6/1/18 12/1/18
Time
12000
J 10000
8000
0
6000
a>
U
o 4000
L WA
C
2000
C
0
U 25
0 4-
1/1/15
1/1/16 1/1/17 1/1/18 1/1/19
Time
AL-02BRLL
12000
11000
_
J
0)
10000
0
9000
12
8000
a)
U
0
2000
U
a)
1500
Boron
�— Cobalt
—0— Manganese
0
1000
U
OBOE
0
10/1/17 2/1/18 6/1/18 10/1/18
Time
Reference
LEGEND
Boron
Cobalt
Manganese
Reporting Limits
Criteria
(ka/L)
(tea/L)
(ka/L)
Boron (Ng/L) 50
2L
700
N/A
50
Cobalt (pg/L) 0.1
IMAC
N/A
1
N/A
Manganese (Ng/L) 5
BTV (S)
50
1.2
75.3
BTV (D)
50
1.9
141
BTV (BR)
50
2.8
26.6
Notes: N/A = Not Applicable BTV =
Background Threshold Value S =
Shallow D = Deep/Transition Zone
BR = Bedrock IMAC = Interim Maximum
Allowable
Concentration
pg/L = micrograms per liter
mg/L = milligrams per liter
14,
synTerra
V Af DUKE
'ENERGY
CAROLINAS
5000
0 4000
c
a�
3000
0
C
0
U)
2000
C
o 200
U
100
0+_
1/1/15
148 RIVER STREET, SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHONE: [phone]
1/1/16 1/1/17 1/1/18 1/1/19
Time
www.synterracorp.com
DRAWN BY: H.Garrett DATE: 4/3/2019
PROJECT MANAGER: B. Wilker
CHECKED BY: G. Barrier
Not Applicable
FIGURE 3-19
TIME -SERIES PLOTS -
DRY ASH LANDFILL PHASE II (1)
2018 CAMA ANNUAL INTERIM
MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC
TERRELL, NORTH CAROLINA

25000
J
20000
c
0
a�
15000
U
0 3000
U
c
0
U.
2000
c
0
U 1000
0 4-
1/1/15
400
350
J
300
c
0 250
ca
L
y-+
200
0 150
U
c
m
100
c
0
U 50
AB-1 OS
1/1/16 1/1/17 1/1/18 1/1/19
Time
--*-- Boron
—V— Cobalt
—I]-- Manganese
AB-10SL
0 1000
U 10
1/1/15 1/1/16 1/1/17
Time
Not Applicable
Boron
�— Cobalt
—0— Manganese
1/1/18 1/1/19
a 4000
0)
c
0
3000
c
a�
U
c
0
U 2000
c
0
0 1000
U 20
Boron
Cobalt
­7— Manganese
1/1/16 1/1/17 1/1/18 1/1/19
Time
Not Applicable
0
11/1/16 5/1/17
11/1/17
Time
5/1/18
11/1/18
Reference
LEGEND
Boron
Cobalt Manganese
Limits
148 RIVER STREET, SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
FIGURE 3-20
Criteria
(L!q/L)
(jig/L.) (jig/L.)Reporting
Boron ( 5o
161P
TIME -SERIES PLOTS -
IM
IMAC
N/A
N/A
N/A 50
1 N/A
Cobalt pg/L o5
� Terra
PHONE:[phone]
DRY ASH LANDFILL PHASE II 2 )
BTV (S)
50
1.2 75.3
ese (
Manganese (pg/L) 5
�T "
www.synterracorp.com
2018 CAMA ANNUAL INTERIM
BTV (D)
50
1.9 141
MONITORING REPORT
BTV (BR)
50
2.8 26.6
Af�L DUKE
DRAWN BY: H.Garrett DATE: 4/3/2019
MARSHALL STEAM STATION
Notes: N/A = Not Applicable BTV =
Background
Threshold Value S =
Shallow D = Deep/Transition Zone
ENERGY
PROJECT MANAGER: B. Wilker
CHECKED BY: G. Barrier
DUKE ENERGY CAROLINAS, LLC
BR = Bedrock IMAC = Interim Maximum
Allowable Concentration
pg/L = micrograms per liter
CAROLINAS
TERRELL, NORTH CAROLINA
mg/L = milligrams per liter

AL-01 S I AL-01 D I AL-01 BR
5000
4000
0)
0 3000
2000
m
U
0 50
U
c
a�
U)
0 25
U
0
1/1/15 1/1/16 1/1/17 1/1/18 1/1/19
Time
MW-14S
J
c
2000
0
ca
c
a) 1000
0 50
U
c
a)
0 25
U
Boron
�— Cobalt
Manganese
0
1/1/15 1/1/16 1/1/17 1/1/18 1/1/19
Time
4000
3500
4000
N;1
0)
0)
3000
c
3000
0
0
0
2500
c
c
2000
2000
0
200
0
100
U
U
m
150
0
75
0
100
0
50
U
U
50
25
0
0
2011 2012 2013 2014 2015 2016 2017 2018 2019
2011
Time
R f B C b It M
e erence
LEGEND Criteria
Oro"
(ka/L)
o a
(fig/L)
anganese
(kg/L)
Reporting Limits
Boron (Ng/L) 50
2L
700
N/A
50
Cobalt (pg/L) 0.1
IMAC
N/A
1
N/A
Manganese (Ng/L) 5
BTV (S)
50
1.2
75.3
BTV (D)
50
1.9
141
BTV (BR)
50
2.8
26.6
Notes: N/A = Not Applicable BTV =
Background Threshold Value S =
Shallow D = Deep/Transition Zone
BR = Bedrock IMAC = Interim Maximum
Allowable
Concentration
pg/L = micrograms per liter
mg/L = milligrams per liter
MW-14D
2013 2015 2017 2019
Time
14,
synTerra
V Af DUKE
'ENERGY
CAROLINAS
J
500
0
c
400
0 100
U
75
Cn
0 50
U
25
0 -17-
12/1/16
180
160
J
140
0 120
100
U
0
80
co
60
Cn
C
0 40
IR
20
0
1/1/15
148 RIVER STREET, SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHONE: [phone]
www.synterracorp.com
DRAWN BY: H.Garrett DATE: 4/3/2019
PROJECT MANAGER: B. Wilker
CHECKED BY: G. Barrier
Boron
—V— Cobalt
—0-- Manganese
12/1/17
Time
12/1/18 1
1/1/18 1/1/19
Time
FIGURE 3-21
TIME -SERIES PLOTS -
DRY ASH LANDFILL PHASE I
2018 CAMA ANNUAL INTERIM
MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC
TERRELL, NORTH CAROLINA

9000
8000
J 7000
6000
0 5000
c 4000
0
U
0 3000
U
2000
0
1000
c
0
U 15
10
5
0
1/1/15
10000
_ 1000
J
c
100
0
10
a�
U
C
0
U 1
c
a�
0.1
c
0
U
0.01
0.001
1/1/16 1/1/17 1/1/18
Time
AB-06BRA
Boron
­v— Cobalt
—0-- Manganese
1/1/19
6/1/17 12/1/17 6/1/18 12/1/18
Time
7000
J
0)
0 6000
c
aD
U
c
0
U
5000
0
600
0
U 400
200
0+_
1/1/15
250.0
200.0
c
0
c 50.0
0
U 0.2
0.0 4-
10/1/17
Boron
--0— Cobalt
�— Manganese
1/1/16 1/1/17 1/1/18
Time
AB-06BRL
Reference
LEGEND
Boron
Cobalt
Manganese
Reporting Limits
Criteria
(ka/L)
(fig/L)
(kg/L)
Boron (Ng/L) 50
2L
700
N/A
50
Cobalt (pg/L) 0.1
IMAC
N/A
1
N/A
Manganese (Ng/L) 5
BTV (S)
50
1.2
75.3
BTV (D)
50
1.9
141
BTV (BR)
50
2.8
26.6
Notes: N/A = Not Applicable BTV =
Background Threshold Value S =
Shallow D = Deep/Transition Zone
BR = Bedrock IMAC = Interim Maximum
Allowable
Concentration
pg/L = micrograms per liter
mg/L = milligrams per liter
2/1/18 6/1/18 10/1/18
Time
14,
synTerra
V Af DUKE
'ENERGY
CAROLINAS
1/1/19
100
90
J 80
70
c
0
60
50
U
c
U 40
30
c 20
0
U 10
0
7/1/15
148 RIVER STREET, SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHONE: [phone]
1/1/16 7/1/16 1/1/17
Time
www.synterracorp.com
DRAWN BY: H.Garrett DATE: 4/3/2019
PROJECT MANAGER: B. Wilker
CHECKED BY: G. Barrier
Not Applicoble
FIGURE 3-22
TIME -SERIES PLOTS -
PV STRUCTURAL FILL
2018 CAMA ANNUAL INTERIM
MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC
TERRELL, NORTH CAROLINA

2018 CAMA Annual Interim Monitoring Report April 30, 2019
Duke Energy Carolinas, LLC - Marshall Steam Station SynTerra
TABLES

TABLE 1-1
MONITORING WELL CONSTRUCTION INFORMATION
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Date
Installed
Monitoring
Zone
Material
Diameter
(Inches)
Northing
(Ft-NAD 83)
Easting
(Ft-NAD 83)
Measuring Point
TOC Elevation
(Ft-NAVD 88)
Ground Surface
Elevation
(Ft-NAVD 88)
Total Well
Depth
(Ft-BGS)
Measured
Well Depth'
(Ft-BTOC)
Screened
Interval
(Ft BTOC)
Top of Screen
Elevation
(Ft-NAVD 88)
Bottom of Screen
Elevation
(Ft-NAVD 88)
AB-10D
6/27/2015
Bedrock
PVC
6.0
683743.73
1415472.14
802.68
799.58
84.20
87.30
74.10
79.10
728.58
723.58
AB-10BR
8/25/2016
Bedrock
PVC
2.0
683738.00
1415482.00
802.54
799.53
134.00
137.01
123.01
128.01
679.53
674.53
AB-10BRL
11/8/2018
Bedrock
PVC
2.0
683732.39
1415493.29
801.59
799.35
263.00
262.24
252.24
262.24
549.35
539.35
AB-10S
3/31/2015
Shallow
PVC
2.0
683755.48
1415452.07
802.41
799.54
27.87
30.74
11.87
26.87
790.54
775.54
AB-10SL
3/31/2015
Shallow
PVC
2.0
683751.65
1415457.75
802.52
799.52
56.00
59.00
43.00
53.00
759.52
749.52
AB-11D
6/30/2015
Bedrock
PVC
5.0
685049.51
1416180.09
799.95
796.84
88.11
91.22
80.11
85.11
719.84
714.84
AB-11S
6/23/2015
Shallow
PVC
2.0
685056.24
1416188.51
800.05
796.89
19.16
22.32
9.16
19.16
790.89
780.89
AB-12BR
9/1/2016
Bedrock
PVC
2.0
683502.00
1414695.00
795.43
792.59
114.60
114.60
103.34
108.34
692.09
687.09
AB-12D
4/30/2015
Bedrock
PVC
5.0
683503.70
1414672.93
795.45
792.56
73.69
76.58
64.89
69.89
730.56
725.56
AB-12S
3/26/2015
Shallow
PVC
2.0
683503.35
1414678.32
795.61
792.70
15.91
18.82
5.91
15.91
789.70
779.70
AB-12SL
3/26/2015
Shallow
PVC
2.0
683502.36
1414682.08
795.67
792.70
54.97
57.94
42.97
52.97
752.70
742.70
AB-13D
6/19/2015
Bedrock
PVC
6.0
684196.73
1413520.32
824.55
821.59
95.96
98.92
83.96
88.96
740.59
735.59
AB-13S
4/8/2015
Shallow
PVC
2.0
684180.48
1413524.42
823.73
821.21
33.52
36.04
17.32
32.32
806.41
791.41
AB-14D
6/8/2015
Deep
PVC
5.0
683676.24
1412767.69
824.11
821.45
93.76
96.42
82.66
87.66
741.45
736.45
AB-14DU
7/12/2018
Shallow
PVC
2.0
683658.34
1412768.38
824.83
822.01
53.00
55.82
45.82
55.82
779.01
769.01
AB-14S
6/4/2015
Shallow
PVC
2.0
683679.54
1412755.12
824.71
821.73
23.68
26.66
8.68
23.68
816.03
801.03
AB-15BR
6/16/2015
Bedrock
PVC
6.0
684803.85
1413514.37
823.01
820.04
118.77
121.74
109.97
114.97
713.04
708.04
AB-15D
6/1/2315
Bedrock
PVC
6.0
684822.45
1413524.15
823.04
820.26
77.78
80.56
66.78
71.78
756.26
751.26
AB-15S
4/4/2015
Shallow
PVC
2.0
684814.88
1413521.39
823.27
820.14
23.13
26.26
8.13
23.13
815.14
800.14
AB-15SL
4/3/2015
Shallow
PVC
2.0
684808.89
1413518.56
823.17
820.02
57.15
60.30
43.15
53.15
780.02
770.02
AB-16DU
7/10/2018
Deep
PVC
2.0
685509.16
1413795.02
823.00
820.15
30.00
31.00
21.00
31.00
802.00
792.00
AB-16D
7/13/2015
Bedrock
PVC
6.0
685497.55
1413778.99
822.45
819.50
50.05
53.00
43.95
48.95
778.50
773.50
AB-16S
5/13/2015
Shallow
PVC
2.0
685490.38
1413784.53
822.08
819.02
16.66
19.72
6.26
16.26
815.82
805.82
AB-17D
6/16/2015
Bedrock
PVC
6.0
686446.33
1413066.01
833.56
830.58
123.98
126.96
108.98
113.98
724.58
719.58
AB-17S
4/6/2015
Shallow
PVC
2.0
686446.68
1413054.46
833.29
830.29
25.01
28.01
9.00
24.00
824.29
809.29
AB-18DU
4/25/2018
Deep
PVC
2.0
685642.69
1412857.79
825.21
822.50
53.00
55.71
45.71
55.71
779.50
769.50
AB-18D
7/2/2015
Bedrock
PVC
6.0
685663.31
1412917.88
825.20
822.24
83.46
86.42
74.96
79.96
750.24
745.24
AB-18S
4/7/2015
Shallow
PVC
2.0
685664.48
1412929.98
825.40
822.26
16.64
19.78
6.14
16.14
819.26
809.26
AB-1BRLLL
1/18/2019
Bedrock
PVC
2.0
681586.36
1417714.44
775.70
775.45
416.00
413.25
403.25
413.25
372.45
362.45
AB-1BRLL
8/2/2018
Bedrock
PVC
2.0
681530.34
1417683.02
774.54
774.79
205.00
205.00
195.00
205.00
579.54
569.54
Page 1 of 7

TABLE 1-1
MONITORING WELL CONSTRUCTION INFORMATION
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Date
Installed
Monitoring
Zone
Material
Diameter
(Inches)
Northing
(Ft-NAD 83)
Easting
(Ft-NAD 83)
Measuring Point
TOC Elevation
(Ft-NAVD 88)
Ground Surface
Elevation
(Ft-NAVD 88)
Total Well
Depth
(Ft-BGS)
Measured
Well Depth'
(Ft-BTOC)
Screened
Interval
(Ft BTOC)
Top of Screen
Elevation
(Ft-NAVD 88)
Bottom of Screen
Elevation
(Ft-NAVD 88)
AB-1BRL
9/28/2017
Bedrock
PVC
2.0
681543.59
1417690.50
774.78
774.77
166.00
166.02
161.01
166.01
613.77
608.77
AB-1BR
7/8/2015
Bedrock
PVC
6.0
681572.86
1417706.31
777.21^
774.83
134.38
136.76
121.38
126.38
655.83
650.83
AB-1D
7/8/2015
Deep
PVC
6.0
681567.96
1417702.65
777.09^
774.93
99.90
102.30
93.40
98.40
683.69
678.69
AB-1S
7/1/2015
Shallow
PVC
2.0
681562.00
1417700.48
777.27^
774.75
23.71
26.42
8.21
23.21
769.06
754.06
AB-20D
6/26/2015
Bedrock
PVC
6.0
684634.94
1411519.25
892.35
889.34
147.31
150.32
142.21
147.21
750.14
745.14
AB-20S
5/1/2015
Shallow
PVC
2.0
684640.86
1411523.77
892.43
889.29
72.39
75.53
56.64
71.64
835.79
820.79
AB-21D
4/7/2015
Deep
PVC
5.0
681948.98
1414935.24
810.23
807.61
83.54
86.16
62.62
67.62
747.61
742.61
AB-21S
3/24/2015
Shallow
PVC
2.0
681953.18
1414925.09
810.66
807.95
30.71
33.42
15.71
30.71
794.95
779.95
AB-2BR
12/11/2018
Bedrock
PVC
2.0
680491.42
1417106.04
781.06
778.13
300.00
302.93
292.93
302.93
488.13
478.13
AB-2D
7/8/2015
Deep
PVC
6.0
680479.38
1417087.65
781.44
778.48
104.06
107.02
93.96
98.96
687.48
682.48
AB-2S
7/2/2015
Shallow
PVC
2.0
680484.01
1417091.23
781.30
778.58
34.72
37.44
19.72
34.72
761.58
746.58
AB-3D
5/26/2015
Bedrock
PVC
5.0
680532.62
1415467.17
815.03
812.14
143.89
146.79
132.90
137.90
682.14
677.14
AB-3S
3/23/2015
Shallow
PVC
2.0
680539.34
1415469.71
815.08
812.00
26.58
29.66
11.08
26.08
804.00
789.00
AB-4D
4/14/2015
Deep
PVC
5.0
681015.22
1415006.25
810.01
807.17
87.44
90.28
74.34
79.34
735.67
730.67
AB-4S
3/20/2015
Shallow
PVC
2.0
681009.41
1415022.53
809.73
807.43
26.80
29.10
8.30
23.30
801.43
786.43
AB-4SL
3/20/2015
Shallow
PVC
2.0
681011.27
1415014.27
809.85
807.34
57.51
60.02
41.01
51.01
768.84
758.84
AB-5BR
6/20/2015
Bedrock
PVC
6.0
680719.35
1414280.82
807.55
804.45
125.60
128.70
108.10
113.10
699.45
694.45
AB-5D
6/3/2015
Deep
PVC
6.0
680714.03
1414278.89
807.52
804.47
88.05
91.10
81.05
86.05
726.47
721.47
AB-5DU
7/16/2018
Shallow
PVC
2.0
680731.63
1414285.81
807.58
804.92
65.00
67.66
57.66
67.66
749.92
739.92
AB-5S
3/24/2015
Shallow
PVC
2.0
680708.77
1414277.38
807.50
804.56
21.44
24.38
6.14
21.14
801.36
786.36
AB-6BRL
9/29/2017
Bedrock
PVC
2.0
682285.34
1412826.39
836.76
834.14
160.00
--
157.61
162.61
679.14
674.14
AB-6BR
6/23/2015
Bedrock
PVC
6.0
682246.45
1412848.99
835.77
832.84
121.93
124.86
107.93
112.93
727.84
722.84
AB-6BRA
3/10/2017
Bedrock
PVC
2.0
682267.38
1412842.78
836.70
833.77
105.00
--
100.00
105.00
733.77
731.70
AB-6D
4/22/2015
Bedrock
PVC
5.0
682239.65
1412851.32
835.36
832.90
78.26
80.72
64.96
69.96
770.40
765.40
AB-6S
4/22/2015
Shallow
PVC
2.0
682232.33
1412854.25
835.38
832.77
24.61
27.22
9.61
24.61
825.77
810.77
AB-7D
5/15/2015
Deep
PVC
5.0
682818.72
1413214.92
834.13
831.21
95.92
98.84
81.92
86.92
752.21
747.21
AB-7DU
7/16/2018
Shallow
PVC
2.0
682836.44
1413215.01
834.08
831.62
55.00
57.46
47.46
57.46
786.62
776.62
AB-7S
3/25/2015
Shallow
PVC
2.0
682815.06
1413224.11
834.29
831.43
23.86
26.72
7.86
22.86
826.43
811.43
AB-8D
5/8/2015
Bedrock
PVC
5.0
682836.10
1414032.89
800.50
797.50
104.30
107.30
98.00
103.00
702.50
697.50
AB-8DU
7/12/2018
Shallow
PVC
2.0
682835.10
1414024.95
800.38
797.53
60.20
63.05
52.85
62.85
747.53
737.53
Page 2 of 7

TABLE 1-1
MONITORING WELL CONSTRUCTION INFORMATION
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Date
Installed
Monitoring
Zone
Material
Diameter
(Inches)
Northing
(Ft-NAD 83)
Easting
(Ft-NAD 83)
Measuring Point
TOC Elevation
(Ft-NAVD 88)
Ground Surface
Elevation
(Ft-NAVD 88)
Total Well
Depth
(Ft-BGS)
Measured
Well Depth'
(Ft-BTOC)
Screened
Interval
(Ft BTOC)
Top of Screen
Elevation
(Ft-NAVD 88)
Bottom of Screen
Elevation
(Ft-NAVD 88)
AB-8S
4/8/2015
Shallow
PVC
2.0
682831.71
1414030.28
800.33
797.42
17.94
20.85
5.91
15.91
794.42
784.42
AB-9BR
7/10/2015
Bedrock
PVC
4.0
683043.55
1415269.85
797.64
794.94
112.80
115.50
80.70
85.70
716.94
711.94
AB-9D
4/28/2015
Bedrock
PVC
5.0
683050.64
1415263.19
797.26
794.76
63.00
65.50
50.50
55.50
746.76
741.76
AB-9S
4/27/2015
Shallow
PVC
2.0
683044.02
1415261.07
797.78
795.38
15.40
17.80
5.40
15.40
792.38
782.38
AL-1BRL
11/14/208
Bedrock
PVC
2.0
683171.25
1417001.00
815.41
813.29
277.00
277.12
267.12
277.12
548.29
538.29
AL-1BR
8/30/2016
Bedrock
PVC
2.0
683136.00
1417013.00
818.07
815.02
132.00
--
125.04
130.04
693.02
688.02
AL-1D
4/30/2015
Deep
PVC
5.0
683144.37
1417007.50
817.94
815.05
92.29
95.18
82.49
87.49
735.45
730.45
AL-1S
4/2/2015
Shallow
PVC
2.0
683157.68
1417002.90
817.97
814.93
50.34
53.38
34.54
49.54
783.43
768.43
AL-2BRLLL
11/12/2018
Bedrock
PVC
2.0
684635.23
1414836.03
915.81
913.01
500.00
492.80
482.81
492.81
433.00
423.00
AL-2BRLL
9/25/2017
Bedrock
PVC
2.0
684602.98
1414853.87
914.63
911.77
345.00
--
342.86
347.86
571.77
566.77
AL-2BRL
9/1/2016
Bedrock
PVC
2.0
684604.35
1414856.70
915.39
912.67
262.50
--
257.30
262.30
658.09
653.09
AL-2BR
7/8/2015
Bedrock
PVC
6.0
684615.63
1414830.04
915.10
912.78
230.82
233.14
205.92
210.92
709.18
704.18
AL-2D
5/27/2015
Deep
PVC
6.0
684620.72
1414826.75
915.33
912.83
164.50
167.00
154.50
159.50
760.83
755.83
AL-2S
4/28/2015
Shallow
PVC
2.0
684610.22
1414833.97
915.41
912.53
130.18
133.06
114.58
129.58
800.83
785.83
AL-3BR
8/30/2016
Bedrock
PVC
2.0
685509.00
1415050.00
919.02
916.03
239.30
--
231.49
236.49
687.53
682.53
AL-3D
5/29/2015
Deep
PVC
6.0
685495.15
1415062.57
918.69
915.99
189.70
192.40
181.20
186.20
737.49
732.49
AL-3S
4/28/2015
Shallow
PVC
2.0
685501.12
1415062.23
918.59
915.77
120.42
123.24
99.62
120.42
818.97
798.17
AL-4BR
8/30/2016
Bedrock
PVC
2.0
685140.00
1414559.00
918.72
915.75
211.00
--
181.97
186.97
736.75
731.75
AL-4BRL
9/27/2017
Bedrock
PVC
2.0
685158.92
1414585.85
918.74
915.85
260.00
--
252.90
262.90
665.85
655.85
AL-4D
6/28/2015
Deep
PVC
6.0
685149.26
1414565.27
918.44
916.01
159.83
162.26
150.83
155.83
767.61
762.61
BG-1BR
4/18/2015
Bedrock
PVC
6.0
687812.80
1419851.83
817.94
814.85
94.09
97.18
87.09
92.09
730.85
725.85
BG-1BRA
3/13/2017
Bedrock
PVC
2.0
687823.58
1419843.84
817.24
814.23
89.00
--
84.00
89.00
730.23
728.24
BG-1D
6/24/2015
Deep
PVC
6.0
687818.48
1419859.84
817.63
814.75
45.28
48.16
37.88
42.88
779.75
774.75
BG-1S
6/3/2015
Shallow
PVC
2.0
687816.43
1419863.84
817.35
814.79
20.06
22.62
10.06
20.06
807.29
797.29
BG-2BR
6/23/2015
Bedrock
PVC
6.0
686181.35
1418418.84
814.81
811.99
63.45
66.27
52.82
57.82
761.99
756.99
BG-2S
6/18/2015
Shallow
PVC
2.0
686177.84
1418417.96
814.33
811.82
19.53
22.04
9.51
19.51
804.82
794.82
BG-3BR
4/5/2015
Bedrock
PVC
6.0
686843.40
1418979.67
867.69
864.72
113.97
116.93
107.97
112.97
759.72
754.72
BG-3D
6/25/2015
Deep
PVC
6.0
686842.13
1419003.32
864.18
861.56
73.03
75.65
61.62
66.62
802.56
797.56
BG-3S
6/4/2015
Shallow
PVC
2.0
686842.99
1419015.34
863.03
860.75
42.09
44.37
24.48
34.48
838.55
828.55
CCR-10D
5/10/2016
Deep
PVC
1 2.0
1 682235.68
1417522.04
1 796.01
1 792.66 ❑
1 73.43
76.78
1 68.43
1 73.43
1 727.58
1 722.58
Page 3 of 7

TABLE 1-1
MONITORING WELL CONSTRUCTION INFORMATION
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Date
Installed
Monitoring
Zone
Material
Diameter
(Inches)
Northing
(Ft-NAD 83)
Easting
(Ft-NAD 83)
Measuring Point
TOC Elevation
(Ft-NAVD 88)
Ground Surface
Elevation
(Ft-NAVD 88)
Total Well
Depth
(Ft-BGS)
Measured
Well Depth'
(Ft-BTOC)
Screened
Interval
(Ft BTOC)
Top of Screen
Elevation
(Ft-NAVD 88)
Bottom of Screen
Elevation
(Ft-NAVD 88)
CCR-10S
4/28/2016
Shallow
PVC
2.0
682238.94
1417517.24
796.46
792.91
22.76
26.31
7.76
22.76
788.70
773.70
CCR-11D
4/22/2016
Deep
PVC
2.0
682078.97
1417292.17
793.86
791.27
79.87
82.46
74.87
79.87
718.99
713.99
CCR-11S
4/21/2016
Shallow
PVC
2.0
682082.49
1417288.44
794.24
791.56
22.81
25.49
7.81
22.81
786.43
771.43
CCR-12D
4/27/2016
Deep
PVC
2.0
682446.12
1416714.27
793.84
791.09
89.66
92.41
84.66
89.66
709.18
704.18
CCR-12S
4/26/2016
Shallow
PVC
2.0
682451.33
1416717.77
793.85
791.22
23.40
26.03
8.40
23.40
785.45
770.45
CCR-13D
4/27/2016
Deep
PVC
2.0
682838.47
1416772.08
800.02
797.21
84.87
87.68
79.87
84.87
720.15
715.15
CCR-13S
4/27/2016
Shallow
PVC
2.0
682830.07
1416766.19
799.68
796.75
74.11
77.04
59.11
74.11
740.57
725.57
CCR-14D
5/10/2016
Deep
PVC
2.0
683281.01
1416626.84
796.11
793.23
64.59
67.47
59.59
64.59
736.52
731.52
CCR-14S
5/4/2016
Shallow
PVC
2.0
683291.34
1416624.08
795.97
793.43
22.22
24.76
7.22
22.22
788.75
773.75
CCR-15D
4/22/2016
Deep
PVC
2.0
683867.76
1415819.89
805.14
802.42
61.23
63.95
56.23
61.23
748.91
743.91
CCR-15S
4/15/2016
Shallow
PVC
2.0
683863.39
1415815.68
804.76
802.24
21.51
24.03
6.51
21.51
798.25
783.25
CCR-16D
4/25/2016
Deep
PVC
2.0
684323.00
1416034.21
819.37
816.42
51.45
54.40
46.45
51.45
772.92
767.92
CCR-16S
4/16/2016
Shallow
PVC
2.0
684327.66
1416038.12
819.32
816.15
23.70
26.87
8.70
23.70
810.62
795.62
CCR-1D
4/21/2016
Deep
PVC
2.0
679956.53
1415048.41
809.32
807.42
90.89
92.79
85.89
90.89
723.43
718.43
CCR-1S
4/13/2016
Shallow
PVC
2.0
679962.30
1415053.47
810.31
807.34
37.91
40.88
22.91
37.91
787.40
772.40
CCR-21D
4/20/2016
Deep
PVC
2.0
680115.92
1415484.79
806.89
804.12
81.96
84.73
76.96
81.96
729.93
724.93
CCR-2S
4/14/2016
Shallow
PVC
2.0
680118.48
1415490.52
806.56
804.24
34.75
37.07
19.75
34.75
786.81
771.81
CCR-31D
5/12/2016
Deep
PVC
2.0
679259.37
1416472.78
780.44
777.10
101.36
104.70
96.36
101.36
684.08
679.08
CCR-3S
5/10/2016
Shallow
PVC
2.0
679264.24
1416475.78
780.28
777.39
36.23
39.12
21.23
36.23
759.05
744.05
CCR-41D
5/3/2016
Deep
PVC
2.0
679823.07
1416864.75
783.82
780.94
105.25
108.13
100.25
105.25
683.57
678.57
CCR-4S
4/20/2016
Shallow
PVC
2.0
679816.52
1416860.48
783.66
780.85
35.24
38.05
20.24
35.24
763.42
748.42
CCR-51D
5/5/2016
Deep
PVC
2.0
680244.25
1417133.74
776.97
774.24
85.14
87.87
80.14
85.14
696.83
691.83
CCR-5S
4/19/2016
Shallow
PVC
2.0
680250.77
1417138.33
777.25
774.23
33.34
36.36
18.34
33.34
758.91
743.91
CCR-91D
5/13/2016
Deep
PVC
2.0
681884.33
1417909.29
799.80
796.84
100.46
103.42
95.46
100.46
704.34
699.34
CCR-9DA
2/14/2017
Deep
PVC
2.0
681903.07
1417913.56
799.77
796.84
120.25
123.18
114.10
119.10
685.67
680.67
CCR-9S
4/29/2016
Shallow
PVC
2.0
681882.90
1417903.10
799.88
796.91
45.20
48.17
30.20
45.20
769.68
754.68
GWA-10D
3/24/2016
Deep
PVC
6.0
683550.78
1417401.67
778.10
775.27
122.84
125.67
116.34
120.84
661.77
657.27
GWA-10S
4/6/2016
Shallow
PVC
2.0
683558.12
1417398.84
777.65
775.32
23.34
25.67
7.34
22.34
770.32
755.32
GWA-11BR
3/8/2017
Bedrock
PVC
2.0
682799.86
1417430.69
810.03
807.00
155.00
158.02
153.02
158.02
657.00
652.00
GWA-11D
3/9/2016
Deep
PVC
6.0
682800.44
1417422.52
811.24
808.24
129.00
131.99
112.80
117.80
698.44
693.44
GWA-11S
3/11/2016
Shallow
PVC
2.0
682793.57
1417401.58
812.55
809.59
78.96
81.92
42.76
57.76
769.79
754.79
Page 4 of 7

TABLE 1-1
MONITORING WELL CONSTRUCTION INFORMATION
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Date
Installed
Monitoring
Zone
Material
Diameter
(Inches)
Northing
(Ft-NAD 83)
Easting
(Ft-NAD 83)
Measuring Point
TOC Elevation
(Ft-NAVD 88)
Ground Surface
Elevation
(Ft-NAVD 88)
Total Well
Depth
(Ft-BGS)
Measured
Well Depth'
(Ft-BTOC)
Screened
Interval
(Ft BTOC)
Top of Screen
Elevation
(Ft-NAVD 88)
Bottom of Screen
Elevation
(Ft-NAVD 88)
GWA-12BR
5/24/2016
Bedrock
PVC
6.0
682081.55
1410362.43
875.65
876.02
147.63
147.27
112.63
117.63
763.02
758.02
GWA-12D
5/13/2016
Bedrock
PVC
6.0
682092.53
1410359.68
875.83
876.29
108.54
108.08
87.54
92.54
788.29
783.29
GWA-12S
5/24/2016
Shallow
PVC
2.0
682077.92
1410362.36
887.87
888.01
25.06
24.92
9.46
24.46
878.41
863.41
GWA-13D
6/3/2016
Deep
PVC
6.0
683383.12
1410266.56
888.28
888.14
198.82
198.96
133.32
138.32
754.96
749.96
GWA-13DA
9/8/2016
Deep
PVC
2.0
683383.24
1410260.62
888.28
888.14
157.00
--
152.00
157.00
736.14
731.28
GWA-13S
5/25/2016
Shallow
PVC
2.0
683379.30
1410275.40
887.87
888.01
31.06
30.92
14.36
29.36
873.51
858.51
GWA-14D
3/13/2017
Deep
PVC
2.0
685969.66
1410111.63
911.41
911.48
110.00
109.92
104.42
109.42
806.98
801.98
GWA-14S
3/13/2017
Shallow
PVC
2.0
685968.00
1410101.56
910.69
911.24
50.00
--
34.45
49.45
876.24
861.24
GWA-15S
3/10/2017
Shallow
PVC
2.0
682858.33
1417583.58
781.39
778.53
37.00
--
23.66
38.66
757.73
742.73
GWA-15D
7/20/2018
Deep
PVC
2.0
682846.79
1417586.03
781.85
778.96
70.00
72.89
61.89
71.89
719.96
709.96
GWA-1BR
7/6/2015
Bedrock
PVC
6.0
679326.85
1416338.18
806.10
803.15
159.95
162.90
154.45
159.45
651.65
646.65
GWA-11D
7/2/2015
Deep
PVC
6.0
679331.07
1416339.79
806.05
803.27
127.28
130.06
121.78
126.78
684.27
679.27
GWA-1S
6/29/2015
Shallow
PVC
2.0
679336.11
1416341.98
805.97
803.16
55.81
58.62
40.81
55.81
765.16
750.16
GWA-2DA
3/9/2017
Deep
PVC
2.0
679263.20
1414083.88
826.59
823.79
99.00
--
96.80
101.80
729.79
724.79
GWA-21D
6/2/2015
Deep
PVC
5.0
679252.88
1414089.34
826.69
823.76
103.93
106.86
80.93
85.93
745.76
740.76
GWA-2S
5/14/2015
Shallow
PVC
2.0
679246.18
1414091.25
826.97
823.91
50.06
53.12
13.50
32.56
813.47
794.41
GWA-31D
7/15/2015
Deep
PVC
5.0
685962.19
1411086.36
839.44
836.48
54.16
57.12
38.96
43.96
800.48
795.48
GWA-3S
7/13/2015
Shallow
PVC
2.0
685961.42
1411080.72
839.24
836.42
18.02
20.84
5.82
15.82
833.42
823.42
GWA-41D
6/12/2015
Deep
PVC
5.0
686783.39
1411776.91
902.45
899.38
90.07
93.14
84.07
89.07
818.38
813.38
GWA-4S
5/19/2015
Shallow
PVC
2.0
686776.57
1411777.34
901.97
898.98
67.99
70.98
52.19
67.19
849.78
834.78
GWA-51D
7/8/2015
Deep
PVC
5.0
686811.16
1415693.60
847.17
844.36
52.31
55.12
46.31
51.31
800.86
795.86
GWA-5S
7/2/2015
Shallow
PVC
2.0
686815.49
1415696.44
847.22
844.30
37.42
40.34
27.42
37.42
819.80
809.80
GWA-61D
7/7/2015
Bedrock
PVC
6.0
686115.40
1416996.20
845.72
843.32
117.91
120.31
104.40
109.40
741.32
736.32
GWA-6S
6/22/2015
Shallow
PVC
2.0
686100.74
1416987.88
845.37
842.99
52.88
55.26
40.08
50.08
805.29
795.29
GWA-71D
6/17/2015
Deep
PVC
6.0
684227.62
1416711.93
812.50
809.55
37.99
40.94
28.45
33.45
784.05
779.05
GWA-7S
5/21/2017
Shallow
PVC
2.0
684231.64
1416725.60
810.72
807.80
21.92
24.84
11.92
21.92
798.80
788.80
GWA-81D
7/12/2015
Bedrock
PVC
5.0
687478.91
1415906.06
853.68
850.59
64.29
67.38
59.09
64.09
794.59
789.59
GWA-8S
7/12/2015
Shallow
PVC
2.0
687474.71
1415902.00
852.90
849.75
41.15
44.30
26.15
41.15
826.75
811.75
GWA-9BR
7/1/2015
Bedrock
PVC
6.0
685030.13
1410459.13
848.45
845.53
110.00
112.92
86.92
91.92
761.53
756.53
M-23
5/14/2008
Deep
PVC
1.0
--
--
840.24
837.73
22.00
24.51
14.51
24.51
825.73
815.73
M-45
5/14/2008
Deep
PVC
1.0
--
--
848.81
846.22
34.00
1 36.59
26.59
36.59
822.22
812.22
Page 5 of 7

TABLE 1-1
MONITORING WELL CONSTRUCTION INFORMATION
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Date
Installed
Monitoring
Zone
Material
Diameter
(Inches)
Northing
(Ft-NAD 83)
Easting
(Ft-NAD 83)
Measuring Point
TOC Elevation
(Ft-NAVD 88)
Ground Surface
Elevation
(Ft-NAVD 88)
Total Well
Depth
(Ft-BGS)
Measured
Well Depth'
(Ft-BTOC)
Screened
Interval
(Ft BTOC)
Top of Screen
Elevation
(Ft-NAVD 88)
Bottom of Screen
Elevation
(Ft-NAVD 88)
M-6
11/14/2007
Shallow
PVC
2.0
--
--
839.22
836.36
30.00
32.86
17.86
32.86
821.36
806.36
MS-1
12/3/2002
Shallow
PVC
2.0
680783.30
1413134.40
916.32
813.33
24.00
26.99
16.99
26.99
899.33
889.33
MS-10
7/8/2003
Shallow
PVC
2.0
681027.60
1411623.00
851.29
848.29
23.34
26.34
16.34
26.34
834.95
824.95
MS-11
7/9/2003
Shallow
PVC
2.0
680297.50
1411565.00
859.78
856.87
42.72
45.63
35.63
45.63
824.15
814.15
MS-12
2/11/2003
Shallow
PVC
2.0
679540.10
1412087.00
835.66
832.70
31.09
34.05
24.05
34.05
811.61
801.61
MS-13
12/17/2002
Shallow
PVC
2.0
679732.80
1412501.00
841.90
839.19
41.52
44.23
34.23
44.23
807.67
797.67
MS-14
1/7/2003
Shallow
PVC
2.0
679968.40
1413124.00
844.07
841.27
44.38
47.18
37.18
47.18
806.89
796.89
MS-15
12/3/2002
Shallow
PVC
2.0
680428.00
1412428.00
861.47
858.42
63.08
66.13
56.13
66.13
805.34
795.34
MS-16
9/11/2006
Transition Zone
PVC
2.0
681142.30
1412485.00
836.98
834.25
37.46
40.19
30.19
40.19
806.79
796.79
MS-2
1/6/2003
Shallow
PVC
2.0
680048.90
1413358.80
823.18
820.18
29.50
32.51
22.51
32.51
800.67
790.67
MS-3
12/3/2002
Shallow
PVC
2.0
679780.70
1413390.60
814.53
811.50
20.00
23.03
13.03
23.03
801.50
791.50
MS-4
1/8/2003
Shallow
PVC
2.0
679168.90
1412970.30
847.68
844.60
46.00
49.08
39.08
49.08
808.60
798.60
MS-5
12/18/2002
Shallow
PVC
2.0
679223.20
1412595.40
842.04
839.10
38.00
40.94
30.94
40.94
811.10
801.10
MS-6
12/17/2002
Shallow
PVC
2.0
679732.80
1412500.70
841.90
839.19
38.00
40.71
30.71
40.71
811.19
801.19
MS-7
1/3/2003
Shallow
PVC
2.0
680161.50
1412251.30
836.18
833.14
26.00
29.04
19.04
29.04
817.14
807.14
MS-8
9/12/2006
Shallow
PVC
2.0
681496.00
1412015.00
872.34
869.35
51.58
54.57
22.99
32.99
849.35
839.35
MS-9
1/16/2003
Shallow
PVC
2.0
681384.50
1412181.70
868.04
865.36
53.00
55.68
42.68
52.68
825.36
815.36
MW-1
6/27/1989
Shallow
PVC
2.0
682767.00
1417125.00
823.70
821.20
78.75
81.25
69.60
79.60
754.10
744.10
MW-10D
7/27/2010
Deep
PVC
2.0
681327.00
1418119.00
772.04
770.00
87.47
89.51
84.51
89.51
687.53
682.53
MW-10S
7/26/2010
Shallow
PVC
2.0
681328.00
1418114.00
772.05
769.74
29.21
31.52
16.52
31.52
755.53
740.53
MW-11D
7/29/2010
Deep
PVC
2.0
682060.00
1411710.00
884.67
881.95
93.10
95.82
90.82
95.82
793.85
788.85
MW-11S
7/30/2010
Shallow
PVC
2.0
682062.00
1411706.00
884.99
882.01
54.12
57.10
42.10
57.10
842.89
827.89
MW-12D
8/3/2010
Deep
PVC
2.0
683409.00
1410712.00
871.88
869.01
98.30
101.17
96.17
101.17
775.71
770.71
MW-12S
8/3/2010
Shallow
PVC
2.0
683414.00
1410714.00
871.86
869.02
25.10
27.94
12.94
27.94
858.92
843.92
MW-13D
8/4/2010
Deep
PVC
2.0
685017.00
1410464.00
847.05
844.44
48.55
51.16
46.16
51.16
800.89
795.89
MW-13S
8/6/2010
Shallow
PVC
2.0
685021.00
1410462.00
847.49
844.90
20.88
23.47
8.47
23.47
839.02
824.02
MW-14BRL
12/13/2018
Bedrock
PVC
2.0
683633.30
1416982.71
811.77
809.05
301.00
300.71
290.71
300.71
521.05
511.05
MW-14BR
7/15/2015
Bedrock
PVC
5.0
683634.61
1416992.14
810.49
807.65
107.84
110.68
101.84
106.84
708.65
703.65
MW-14D
7/28/2010
Deep
PVC
2.0
683626.00
1416999.00
811.43
808.67
62.60
65.36
60.36
65.36
751.07
746.07
MW-14S
7/30/2010
Shallow
PVC
2.0
683629.00
1416995.00
811.29
808.23
46.87
49.93
34.93
49.93
776.36
761.36
MW-2
6/28/1989
Shallow
PVC
2.0
683834.00
1415046.00
797.21
794.90
35.10
37.41
25.31
35.31
771.90
761.90
Page 6 of 7

TABLE 1-1
MONITORING WELL CONSTRUCTION INFORMATION
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Date
Installed
Monitoring
Zone
Material
Diameter
(Inches)
Northing
(Ft-NAD 83)
Easting
(Ft-NAD 83)
Measuring Point
TOC Elevation
(Ft-NAVD 88)
Ground Surface
Elevation
(Ft-NAVD 88)
Total Well
Depth
(Ft-BGS)
Measured
Well Depth'
(Ft-BTOC)
Screened
Interval
(Ft BTOC)
Top of Screen
Elevation
(Ft-NAVD 88)
Bottom of Screen
Elevation
(Ft-NAVD 88)
MW-3
6/29/1989
Shallow
PVC
2.0
685991.00
1415309.00
813.07
811.00
28.15
30.22
17.97
27.97
795.10
785.10
MW-4
6/30/1989
Shallow
PVC
2.0
686723.00
1414467.00
866.42
863.75
50.20
52.87
42.87
52.87
823.55
813.55
MW-4D
10/12/2006
Bedrock
PVC
2.0
686715.00
1414462.00
866.74
863.37
64.18
67.55
58.87
63.87
807.87
802.87
MW-5
5/22/2000
Shallow
PVC
2.0
684782.00
1415744.00
822.69
820.19
30.71
33.21
20.50
30.50
802.19
792.19
MW-6D
10/11/2006
Deep
PVC
2.0
682253.00
1417831.00
791.19
788.15
87.53
90.57
85.57
90.57
705.62
700.62
MW-6S
10/12/2006
Shallow
PVC
2.0
682250.00
1417836.00
790.35
787.46
24.88
27.77
17.77
27.77
772.58
762.58
MW-7D
10/9/2006
Deep
PVC
2.0
681379.00
1417631.00
776.85
772.90
66.44
70.39
65.39
70.39
711.46
706.46
MW-7S
10/10/2006
Shallow
PVC
2.0
681375.00
1417629.00
775.99
773.10
20.60
23.49
13.49
23.49
762.50
752.50
MW-8D
10/10/2006
Bedrock
PVC
2.0
680944.00
1417513.00
775.18
771.34
97.70
101.54
96.54
101.54
678.64
673.64
MW-8S
10/10/2006
Shallow
PVC
2.0
680948.00
1417509.00
775.34
771.54
27.12
30.92
20.92
30.92
754.42
744.42
MW-9D
10/10/2006
Deep
PVC
2.0
680637.00
1417358.00
777.38
774.34
95.20
98.24
93.24
98.24
684.14
679.14
MW-9S
10/11/2006
Shallow
PVC
2.0
680639.00
1417349.00
777.34
774.22
30.78
33.90
23.90
33.90
753.44
743.44
OB-1 (Ash Basin)
5/12/2015
Shallow
PVC
2.0
681741.34
1413327.90
850.57
847.59
72.51
75.49
42.68
58.48
807.89
792.09
OB-1 (Dry Ash Landfill)
6/28/1989
Shallow
PVC
2.0
682648.00
1417081.00
825.85
823.60
65.50
67.75
55.45
65.45
770.40
760.40
OB-2 (MW-6)
12/17/2010
Shallow
PVC
2.0
685227.10
1414675.00
919.65
917.18
122.14
124.61
104.97
119.97
814.68
799.68
OB-3 (MW-7)
12/16/2010
Shallow
PVC
2.0
685380.10
1414418.00
859.16
856.56
57.25
59.85
41.60
56.60
817.56
802.56
Notes:
(--) - Data not available
1 - Well depths initially measured during well installation and updated as new wells are installed.
Z -"Total Well Depth" is the depth to the bottom of the filter pack.
3 - Values measured during well installation
BGS - Below ground surface
BTOC - Below top of casing
Ft - Feet
IMP - Interim Monitoring Plan
NAD 83 -North American Datum of 1983
NAVD 88 -North American Vertical Datum of 1988
NM - Not measured
PVC- Polyvinyl chloride
Red font indicates abandoned well
Prepared by: ECW Checked by: BDW
Page 7 of 7

TABLE 2-1
2018 CAMA WATER ELEVATIONS
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Quarter 1
Quarter 2
Quarter 3
Quarter 4
Screened
Interval
(Ft-BGS)
Monitoring Zone
Groundwater Elevation
(Ft - NAVD-88)
02/06/2018
Groundwater Elevation
(Ft - NAVD-88)
05/09/2018
Groundwater Elevation
(Ft - NAVD-88)
08/07/2018
Groundwater Elevation
(Ft - NAVD-88)
11/06/2018
AB-1BRL
774.03
774.78
774.78
774.78
161.01
166.01
Bedrock
AB-1BRLL
DNE
DNE
774.54
774.54
194.75
204.75
Bedrock
AB-1BR
776.09
776.96
777.01
776.98
121.38
126.38
Bedrock
AB-1D
772.94
770.97
774.31
773.81
93.40
98.40
Deep
AB-1S
770.39
771.15
771.45
771.24
8.21
23.21
Shallow
AB-2D
766.87
768.16
768.11
767.84
93.96
98.96
Deep
AB-2S
760.30
761.80
761.84
761.92
19.72
34.72
Shallow
AB-3D
794.56
797.41
798.65
798.97
132.90
137.90
Bedrock
AB-3S
794.85
798.86
800.62
800.11
11.08
26.08
Shallow
AB-4D
792.24
794.33
801.48
795.49
74.34
79.34
Deep
AB-4S
796.43
800.01
801.41
801.40
8.30
23.30
Shallow
AB-4SL
796.14
799.79
795.25
801.25
41.01
51.01
Shallow
AB-5BR
798.49
799.60
799.65
797.44
108.10
113.10
Bedrock
AB-5D
798.90
800.07
800.17
797.96
81.05
86.05
Deep
AB-5DU
DNE
DNE
800.28
797.98
57.66
67.66
Deep
AB-5S
798.55
800.20
800.35
799.51
6.14
21.14
Shallow
AB-6BRA
815.87
818.46
818.35
819.72
102.93
107.93
Bedrock
AB-6BRL
815.10
817.41
817.21
818.40
157.61
162.61
Bedrock
AB-6D
816.42
819.01
819.00
820.21
64.96
69.96
Bedrock
AB-6S
818.18
821.06
821.61
822.47
9.61
24.61
Shallow
AB-7D
812.45
815.23
814.20
816.30
81.92
86.92
Deep
AB-7DU
DNE
DNE
814.16
815.89
47.46
57.46
Deep
AB-7S
814.00
816.55
815.97
818.10
7.86
22.86
Shallow
AB-8D
791.51
792.04
793.28
793.85
98.00
103.00
Bedrock
AB-8DU
DNE
DNE
793.27
793.85
53.05
63.05
Deep
AB-8S
791.81
791.40
793.15
793.34
5.91
15.91
Shallow
AB-9BR
790.32
790.56
790.84
791.06
80.70
85.70
Bedrock
AB-9D
789.65
789.84
790.11
790.31
50.50
55.50
Bedrock
AB-9S
790.37
790.55
791.01
790.94
5.40
15.40
Shallow
AB-10BR
790.85
790.83
790.92
791.89
123.01
128.01
Bedrock
AB-10D
790.85
790.84
790.93
791.33
74.10
79.10
Bedrock
AB-10S
792.64
792.57
792.58
792.69
11.87
26.87
Shallow
Page 1 of 5

TABLE 2-1
2018 CAMA WATER ELEVATIONS
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Quarter 1
Quarter 2
Quarter 3
Quarter 4
Screened
Interval
(Ft-BGS)
Monitoring Zone
Groundwater Elevation
(Ft - NAVD-88)
02/06/2018
Groundwater Elevation
(Ft - NAVD-88)
05/09/2018
Groundwater Elevation
(Ft - NAVD-88)
08/07/2018
Groundwater Elevation
(Ft - NAVD-88)
11/06/2018
AB-10SL
791.38
791.35
791.39
791.70
43.00
53.00
Shallow
AB-11D
795.34
796.30
795.71
796.25
80.11
85.11
Bedrock
AB-11S
795.16
795.41
795.20
795.57
9.16
19.16
Shallow
AB-12BR
794.01
794.67
794.72
795.43
103.34
108.34
Bedrock
AB-12D
791.33
791.68
791.87
792.17
64.89
69.89
Bedrock
AB-12S
790.39
790.21
790.55
792.44
5.91
15.91
Shallow
AB-12SL
790.59
790.51
790.87
791.25
42.97
52.97
Shallow
AB-13D
797.50
798.43
798.14
798.65
83.96
88.96
Bedrock
AB-13S
797.08
798.64
798.15
798.80
17.32
32.32
Shallow
AB-14D
809.20
812.25
810.94
812.86
82.66
87.66
Deep
AB-14DU
DNE
DNE
810.89
812.75
45.82
55.82
Deep
AB-14S
808.25
811.53
810.18
812.18
8.68
23.68
Shallow
AB-15BR
804.12
808.57
807.41
808.41
109.97
114.97
Bedrock
AB-15D
803.64
804.75
803.76
804.14
66.78
71.78
Bedrock
AB-15S
805.80
807.29
806.06
806.76
8.13
23.13
Shallow
AB-15SL
801.95
798.67
801.85
802.66
43.15
53.15
Shallow
AB-16D
815.15
817.09
815.55
816.56
43.95
48.95
Bedrock
AB-16DU
DNE
DNE
815.57
816.72
22.85
32.85
Deep
AB-16S
816.29
817.01
816.41
817.01
6.26
16.26
Deep
AB-17D
820.48
820.69
820.37
820.43
108.98
113.98
Bedrock
AB-17S
819.83
819.94
819.73
819.69
9.00
24.00
Shallow
AB-18D
819.15
819.28
819.34
817.55
74.96
79.96
Bedrock
AB-18DU
DNE
DNE
819.42
817.36
45.72
55.72
Deep
AB-18S
818.89
819.01
819.06
818.00
6.14
16.14
Shallow
AB-20D
826.55
826.51
826.63
826.92
142.21
147.21
Bedrock
AB-20S
828.18
828.18
828.35
828.85
56.64
71.64
Shallow
AB-21D
792.28
793.00
793.48
793.98
62.62
67.62
Deep
AB-21S
790.78
791.82
792.16
792.50
15.71
30.71
Shallow
AL-1BR
776.64
777.12
778.09
777.43
125.04
130.04
Bedrock
AL-11D
773.90
774.43
774.14
774.47
82.49
87.49
Deep
AL-1 S
778.99
779.68
779.47
779.69
34.54
49.54
Shallow
AL-2BR
802.67
802.81
803.00
1 802.99
1205.921
210.921
Bedrock
Page 2 of 5

TABLE 2-1
2018 CAMA WATER ELEVATIONS
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Quarter 1
Quarter 2
Quarter 3
Quarter 4
Screened
Interval
(Ft-BGS)
Monitoring Zone
Groundwater Elevation
(Ft - NAVD-88)
02/06/2018
Groundwater Elevation
(Ft - NAVD-88)
05/09/2018
Groundwater Elevation
(Ft - NAVD-88)
08/07/2018
Groundwater Elevation
(Ft - NAVD-88)
11/06/2018
AL-2BRL
806.49
797.99
797.78
798.64
257.30
262.30
Bedrock
AL-2BRLL
800.24
797.07
796.77
797.39
342.86
347.86
Bedrock
AL-21D
801.12
800.80
801.44
801.76
154.50
159.50
Deep
AL-2S
799.95
800.11
800.31
800.55
114.58
129.58
Shallow
AL-3BR
802.99
803.81
803.83
804.17
231.49
236.49
Bedrock
AL-31D
805.02
805.94
805.98
806.53
181.20
186.20
Deep
AL-3S
805.93
806.68
806.81
807.43
99.62
120.42
Shallow
AL-4BRL
796.43
797.23
796.94
797.36
252.90
262.90
Bedrock
AL-4BR
808.44
809.37
808.67
808.80
181.97
186.97
Bedrock
AL-41D
811.51
811.41
811.58
811.76
150.83
155.83
Deep
BG-1BRA
801.52
802.24
802.32
802.73
87.01
92.01
Bedrock
BG-11D
805.36
806.75
806.62
807.15
37.88
42.88
Deep
BG-1S
813.43
808.04
812.06
812.88
10.06
20.06
Shallow
BG-2BR
810.91
808.25
808.07
808.58
52.82
57.82
Bedrock
BG-2S
811.53
809.41
810.50
811.51
9.51
19.51
Shallow
BG-3BR
829.31
832.18
831.76
832.16
107.97
112.97
Bedrock
BG-31D
828.28
837.21
836.87
837.13
61.62
66.62
Bedrock
BG-3S
832.38
835.66
834.58
835.71
24.48
34.48
Shallow
GWA-1BR
764.00
764.42
764.74
764.99
154.45
159.45
Bedrock
GWA-1D
761.59
762.68
762.70
762.82
121.78
126.78
Deep
GWA-1S
760.62
761.64
761.79
761.89
40.81
55.81
Shallow
GWA-2DA
799.29
800.86
799.63
801.60
96.80
101.80
Deep
GWA-2S
798.92
800.82
798.96
801.79
13.50
32.56
Shallow
GWA-3D
832.96
833.16
833.24
833.36
38.96
43.96
Deep
GWA-3S
830.38
830.55
830.72
825.68
5.82
15.82
Shallow
GWA-4D
843.46
843.67
843.38
844.04
84.07
89.07
Deep
GWA-4S
842.93
842.94
842.78
PB
52.19
67.19
Shallow
GWA-5D
809.88
809.83
810.15
809.87
46.31
51.31
Deep
GWA-5S
NM
NM
NM
NM
27.42
37.42
Shallow
GWA-6D
801.31
802.31
802.64
803.04
104.40
109.40
Bedrock
GWA-6S
801.43
802.46
802.76
803.34
40.08
50.08
Shallow
GWA-7D
800.63
802.65
802.17
803.14
28.45
33.45
Dee
Page 3 of 5

TABLE 2-1
2018 CAMA WATER ELEVATIONS
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Quarter 1
Quarter 2
Quarter 3
Quarter 4
Screened
Interval
(Ft-BGS)
Monitoring Zone
Groundwater Elevation
(Ft - NAVD-88)
02/06/2018
Groundwater Elevation
(Ft - NAVD-88)
05/09/2018
Groundwater Elevation
(Ft - NAVD-88)
08/07/2018
Groundwater Elevation
(Ft - NAVD-88)
11/06/2018
GWA-7S
799.02
800.34
800.11
801.52
11.92
21.92
Shallow
GWA-8D
815.03
815.81
816.54
816.25
59.09
64.09
Bedrock
GWA-8S
816.18
816.69
817.62
817.28
26.15
41.15
Shallow
GWA-9BR
846.52
847.70
847.23
847.75
86.92
91.92
Bedrock
GWA-10D
767.87
767.79
767.54
767.80
116.34
120.84
Deep
GWA-10S
765.24
765.13
764.60
765.07
7.34
22.34
Shallow
GWA-11BR
763.06
764.43
764.33
763.88
153.02
158.02
Bedrock
GWA-11D
763.35
764.70
764.55
764.24
112.80
117.80
Deep
GWA-11S
765.53
766.65
766.49
766.42
42.76
57.76
Shallow
GWA-12BR
855.25
857.23
857.53
857.85
112.63
117.63
Bedrock
GWA-12D
856.11
858.50
858.49
858.50
87.54
92.54
Bedrock
GWA-12S
868.06
870.45
870.14
870.77
9.46
24.46
Shallow
GWA-13DA
857.86
860.72
861.13
862.17
152.14
157.14
Deep
GWA-13S
863.45
864.87
867.74
868.85
14.36
29.36
Shallow
GWA-14D
866.75
867.82
868.16
868.97
104.42
109.42
Deep
GWA-14S
866.85
867.64
868.11
868.86
34.45
49.45
Shallow
GWA-15D
DNE
DNE
758.81
757.41
61.89
71.89
Deep
GWA-15S
756.98
758.82
758.66
757.27
23.66
38.66
Shallow
MS-8
825.54
826.12
826.26
826.45
22.99
32.99
Shallow
MS-9
823.66
824.13
824.84
824.68
42.68
52.68
Shallow
MS-10
832.64
833.87
832.63
833.50
16.34
26.34
Shallow
MS-11
824.58
826.36
825.10
825.97
35.63
45.63
Shallow
MS-12
810.98
812.86
812.03
813.03
24.05
34.05
Shallow
MS-13
809.76
811.73
810.76
811.45
34.23
44.23
Shallow
MS-14
805.92
807.17
807.5
806.98
37.18
47.18
Shallow
MS-15
817.78
818.54
818.49
818.9
56.13
66.13
Shallow
MS-16
810.79
811.96
810.94
811.65
30.19
40.19
Shallow
MW-1
772.41
772.86
772.75
772.98
69.60
79.60
Shallow
MW-2
790.93
790.84
791.03
791.9
25.31
35.31
Shallow
MW-3
804.67
805.29
805.39
806.12
17.97
27.97
Shallow
MW-4
827.04
827.81
827.54
BP
42.87
52.87
Shallow
MW-41D
827.42
828.35
827.95
812.7
58.87
1 63.87
Bedrock
Page 4 of 5

TABLE 2-1
2018 CAMA WATER ELEVATIONS
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Quarter 1
Quarter 2
Quarter 3
Quarter 4
Screened
Interval
(Ft-BGS)
Monitoring Zone
Groundwater Elevation
(Ft - NAVD-88)
02/06/2018
Groundwater Elevation
(Ft - NAVD-88)
05/09/2018
Groundwater Elevation
(Ft - NAVD-88)
08/07/2018
Groundwater Elevation
(Ft - NAVD-88)
11/06/2018
MW-5
796.89
798.39
796.67
797.88
20.50
30.50
Shallow
MW-6D
772.13
773.78
774.9
774.39
85.57
90.57
Deep
MW-6S
769.71
771.42
772.05
772.15
17.77
27.77
Shallow
MW-7
812.37
812.16
812.55
812.65
41.60
56.60
Shallow
MW-7D
769.47
770.32
770.67
770.08
65.39
70.39
Dee
MW-7S
762.21
763.14
763.17
762.61
13.49
23.49
Shallow
MW-8D
759.91
761.51
761.5
760.51
96.54
1 101.54
Bedrock
MW-8S
758.13
759.77
759.78
758.58
20.92
1 30.92
Shallow
MW-9D
758.96
760.68
760.63
759.38
93.24
98.24
Dee
MW-9S
760.35
762.96
761.29
763.04
23.90
33.90
Shallow
MW-10D
756.19
758.12
757.61
757.04
84.51
89.51
Dee
MW-10S
756.1
757.97
757.37
756.98
16.52
31.52
Shallow
MW-11D
839.49
840.41
840.4
840.42
90.82
95.82
Dee
MW-11S
839.42
839.79
840.4
840.31
42.10
57.10
Shallow
MW-12D
855.05
859.4
857.43
859.2
96.17
101.17
Dee
MW-12S
855.54
861.45
857.48
860.46
12.94
27.94
Shallow
MW-13D
842.31
844.08
841.79
844.22
46.16
51.16
Dee
MW-13S
841.89
842.34
844.12
843.05
8.47
23.47
1 Shallow
MW-14BR
774.16
774.58
774.14
774.34
101.84
106.84
Bedrock
MW-14D
773.17
773.54
773.11
773.4
60.36
65.36
Deep
MW-14S
773.53
773.88
773.51
773.81
34.93
49.93
Shallow
OB-1 (Ash Basin)(WLO)
800.85
801.68
801.88
801.58
42.68
58.48
Shallow
013-1 (Dry Ash Landfill
779.56
780
780.01
1 780.33
1 55.45
1 65.45
Shallow
OB-2 MW16
809.66
810.45
810.55
1 810.7
1104.971
119.97
Shallow
Notes:
0 - water level identified as anamolous likely due to field transcription error
1 - Artesian conditions present
z Installed in 2018, not sampled
* Abandoned sampling location
** - Survey information incomplete/not available
Not measured/available
BGS - below ground surface
DNE - Did not exist
Ft - feet
BTP - Water Level below top of pump
Dry - Well was dry at time of Water Level check
IMP - Interim Monitoring Plan
NAVD 88 - North American Vertical Datum of 1988.
Prepared by: HEG Checked by: ECW
Page 5 of 5

TABLE 3-1
HORIZONTAL HYDRAULIC GRADIENTS AND FLOW VELOCITIES
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL NC
Shallow Flow Zone
Upgradient
Downgradient
Source Area
Groundwater
Groundwater
K
Ah (ft)
Al (ft)4
ne3
vs
v5
Gradient
Level hl (ft)t
Level ht (ft)2
3
(ft/day)
(ft/day)
(ft/yr)
(Ah/Al)
PV Structural Fill
850
825
1.000
25.00
1300
0.3
0.064
23.40
0.019
Ash Basin
810
1 760
1 1.000
50.00
6120
1 0.3
1 0.027
1 9.94
0.008
Dry Ash Landfill
805
795
1.000
10.00
975
0.3
0.034
12.48
0.010
Phase II
Dry Ash Landfill
Phase I
785
760
1.000
25.00
1 710
0.3
0.117
42.84
0.035
Shallow Flow Zone
Geometric Mean 0.051 18.8 0.02
Average 0.06 22.2 0.02
Deep Flow Zone
Upgradient
Downgradient
Source Area
Groundwater
Groundwater
K
Ah (ft)
Al (ft)4
ne3
vs
v5
Gradient
Level hl (ft)t
Level ht (ft)z
3
(ft/day)
(ft/day)
(ft/yr)
(Ah/AI)
PV Structural Fill
845
820
1.500
25.00
1200
0.3
0.104
38.02
0.021
Ash Basin
815
760
1.500
55.00
8100
0.3
0.034
12.39
0.007
Dry Ash Landfill
805
795
1.500
10.00
970
0.3
0.052
18.81
0.010
Phase II
Dry Ash Landfill
790
760
1.500
30.00
730
0.3
0.205
75.00
0.041
Phase I
Deep Flow Zone
Geometric Mean 0.078 28.6 0.02
Average 0.10 36.1 0.02
Bedrock Flow Zone
Upgradient
Downgradient
Source Area
Groundwater
Groundwater
K
Ah (ft)
Al (ft)4
3
ee
vs
vs
Gradient
Level hl (ft)
Level h, (ft)
(ft/day)
(ft/day)
(ft/yr)
(Ah/AI)
PV Structural Fill
855
825
0.700
30.00
1400
0.01
1.500
547.50
0.021
Ash Basin
820
760
0.700
60.00
7300
0.01
0.575
210.00
0.008
Dry Ash Landfill
805
800
0.700
5.00
880
0.01
0.398
145.17
0.006
Phase II
Dry Ash Landfill
790
760
0.700
30.00
1070
0.01
1.963
716.36
0.028
Phase I
Bedrock Flow Zone
Geometric Mean 0.906 330.7 0.01
Average 1.11 404.8 0.02
Prepared by : ECW Checked by: GAB
Notes:
' - Groundwater level shown corresponds to upgradient groundwater contour on Figures 3-1 through 3-3
z - Groundwater level shown corresponds to downgradient groundwater contour on Figures 3-1 through 3-3
3 - Values taken from Preliminary Updated Groundwater Flow and Transport Modeling Report for Marshall Steam Station, Terrell, INC, November 2018
4 - The length of a flow path between an upgradient and downgradient groundwater contor within the same flow zone
dh/dl - horizontal hydraulic gradient (ft/ft)
ft - feet
h - water level height in feet
K - horizontal hydraulic conductivity
I - horizontal distance between wells
ne - effective porosity
vs - horizontal seepage velocity
Ah - difference in water level height between upgradient and downgradient locations
Al - horizontal distance between upgradient and downgradient locations
Page 1 of 1

TABLE 3-2
VERTICAL HYDRAULIC GRADIENTS
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Monitoring Zone
Reference
Cross -Section
Total Well
Depth "' (Ft-
BGS)
Water Level
Elevation
4Q-2018
Vertical Gradient
(dh/dl)
and Flow Direction
Dry Ash Landfill (Phase
11)
AL-2S
Shallow
N/A
130.18
800.55
-0.0346
Upward
AL-2D
Deep
164.50
801.76
AL-2D
Deep
N/A
164.50
801.76
-0.0238
Upward
AL-2BR
Bedrock
230.82
802.99
AL-2BR
Bedrock
N/A
230.82
802.99
0.0851
Downward
AL-2BRL
Bedrock
263.50
798.64
AL-2BRL
Bedrock
N/A
263.50
798.64
0.0145
Downward
AL-2BRLL
Bedrock
345.00
797.39
AL-3S
Ash Pore Water
N/A
120.42
807.43
0.0122
Downward
AL-3D
Deep
189.70
806.53
AL-3D
Deep
N/A
189.70
806.53
0.0472
Downward
AL-3BR
Bedrock
239.30
804.17
AL-4D
Deep
N/A
159.83
811.76
0.0284
Downward
AL-4BR
Bedrock
211.00
808.80
AL-4BR
Bedrock
N/A
211.00
808.8
-0.1559
Upward
AL-4BRL
Bedrock
260.00
797.36
AB-1 OS
Shallow
C-C'
27.87
792.69
0.0347
Downward
AB-10SL
Shallow
56.00
791.70
AB-10SL
Shallow
C-C'
56.00
791.70
-0.1480
Upward
AB-1 OD
Deep
84.20
791.33
AB-1 OD
Deep
C-C'
84.20
791.33
-0.0070
Upward
AB-10BR
Bedrock
134.00
791.89
Dry Ash Landfill (Phase
1)
AL-1 S
Shallow
N/A
50.34
779.69
0.1214
Downward
AL-1 D
Deep
92.29
774.47
AL-1 D
Deep
N/A
92.29
774.47
-0.0698
Upward
AL-1 BR
Bedrock
132.00
777.43
GWA-11S
Shallow
N/A
78.96
766.42
0.0329
Downward
GWA-11 D
Deep
129.00
764.24
GWA-11 D
Deep
N/A
129.00
764.24
0.0087
Downward
GWA-11 BR
Bedrock
155.00
763.88
Downgradient of Ash Basin Dam
AB-1 S
Shallow
N/A
23.71
771.24
-0.0320
Upward
AB-1 D
Deep
99.90
773.81
AB-1 D
Deep
N/A
99.90
773.81
-0.1138
Upward
AB-1 BR
Bedrock
134.38
776.98
Page 1 of 2

TABLE 3-2
VERTICAL HYDRAULIC GRADIENTS
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Monitoring Zone
Reference
Cross -Section
Total Well
Depth 1,2 (Ft-
BGS)
Water Level
Elevation
4Q-2018
Vertical Gradient
(dh/dl)
and Flow Direction
Downgradient of Ash Basin Dam (Continued)
A13-1 BR
Bedrock
N/A
134.38
776.98
0.0523
Downward
A13-1 BRL
Bedrock
166.00
774.78
A13-1 BRL
Bedrock
N/A
166.00
774.78
0.0066
Downward
A13-1 BRLL
Bedrock
205.00
774.54
PV Structural Fill
AB-6S
Ash Pore Water
C-C'
24.61
822.47
0.0449
Downward
AB-6D
Bedrock
78.26
820.21
A13-6D
Bedrock
C-C'
78.26
820.21
0.0115
Downward
A13-6BRA
Bedrock
112.93
819.72
Middle of Ash Basin
AB-12S
Ash Pore Water
A-A'/C-C'
15.91
792.44
0.0322
Downward
AB-12SL
Ash Pore Water
54.97
791.25
AB-12SL
Ash Pore Water
A-A'
54.97
791.25
-0.0468
Upward
AB-12D
Bedrock
73.69
792.17
AB-12D
Bedrock
A -A'
73.69
792.17
0.0847
Upward
AB-12BR
Bedrock
114.60
795.43
Notes
"Boring Depth" is the total depth of soil boring; "Total Well Depth" is the depth to the bottom of the filter pack.
z - Values measured during well installation
BGS - Below ground surface
NAVD 88 - North American Vertical Datum 1988
Prepared by: JYT Checked By: ECW
Page 2 of 2

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
FIELD PARAMETERS
WATER QUALITY PARAMETERS
SELECTED 40CFR257 APPENDIX III CONSTITUENTS plus Sr
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
PH
Water
Level
Temp
Spec
Cond
DO
ORP
Eh
Turbidity
Alkalinity
Bi-
carbonate
Alkalinity
Sulfide
Total
Organic
Carbon
Total
Suspended
Solids
Boron
Calcium
Chloride
Strontium
Sulfate
Total
Dissolved
Solids
Aluminum
Antimony
Arsenic
Barium
Beryllium
Cadmium
Chromium
(VI)
Chromium
Cobalt
Reporting Units
S.U.
ft
Deg C
pmhos/cm
mg/L
mV
mV
NTUs
mg/L
mg/L
mg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
6.5-8.5
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
700
NE
250
NE
250
Soo
NE
1*
10
700
4*
2
10
10
1*
Background Threshold Values (Shallow Unit)
4.6-6.4
NE
NE
NE
NE
NE
NE
NE
63
63
0.1
1
NE
50
10.7
5.5
303
4.2
140
757
0.5
0.4
310
0.2
0.08
5.7
16.5
1.2
Background Threshold Values (Deep Unit)
5.7-6.9
NE
NE
NE
NE
NE
NE
NE
204
204
0.1
1
NE
50
13.1
4.7
665
17.7
183
128
0.5
0.6
127
0.1
0.08
3
7.6
1.9
Background Threshold Values (Bedrock Unit)
5.6-7.6
NE
NE
I NE
I NE
NE
NE
I NE
108
108
0.1
1
NE
50
15
1 4.5
253
1 18.4
1 216
300
0.5
0.6
435
1 0.2
0.08
3.9
1 8.3
2.8
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
AB-01BR
Bedrock
02/08/2018
6.3
0.86
14
941
0.40
5
210
0.6
41.8
41.8
<0.1
<1
<2.5
2060
90.3
218
1980
41.6
578
<100
<0.5
0.19 SI
66.6
<0.1
<0.08
<0.12
<0.5
1.3
AB-01BR
Bedrock
05/10/2018
6.2
0.25
19
973
0.20
-45
160
1.2
33.8
33.8
<0.1
<1
<2.5
2250
87
220
2080
52.8
648
<100
<0.5
0.19 SI
69.7
0.038j
<0.08
<0.025
0.5 j,S1
1.5
AB-01BR
Bedrock
08/13/2018
6.2
6.10
24
987
0.20
-2
203
5.0
39
39
<0.1
<1
3
2670
91.2
233
2160
57.2 MS
588
SOS
<0.5
0.15
75.2
0.049j
<0.08
<0.025
0.28 j,S1
3.8
AB-01BR
Bedrock
11/12/2018
6.1
0.06
15
1042
0.20
-2
203
9.7
40.9
40.9
<0.1
<1
10.6
3460
98.2
260
2400
60.9
674
419
<0.5
0.27
85.3
0.068 j
<0.08
<0.025
0.8 B,S1
3.5
AB-01BRL
Bedrock
02/08/2018
7.0
0.70
15
1132
0.30
-25
180
0.9
41.6
41.6
<0.1
<1
<2.5
1980
128
290
2040
37.7
752
<100
<0.5
0.23 SI
330
<0.1
<0.08
<0.12 D3
<0.5
<0.1
AB-01BRL
Bedrock
04/11/2018
6.3
0.60
16
1181
0.80
-12
193
1.1
40.8
40.8
<0.1
NA
<3
1840
112
283
2040
39
654
<100
<0.5
0.27
278
0.039j
0.03j
<0.025
0.65
0.082j
AB-01BRL
Bedrock
05/10/2018
6.5
0.00
20
1170
0.30
-43
163
1.5
36.1
36.1
<0.1
<1
<2.7
2080
122
277
2070
39.4
674
<100
<0.5
0.16 SI
308
<0.1
<0.08
<0.025
0.15 j,S1
0.049j
AB-01BRL
Bedrock
08/13/2018
7.0
0.00
20
1030
0.10
-150
55
9.8
51.7
51.7
<0.1
1.1
14.4
1850
108
249
1800
35.7
728
627
<0.5
0.11
218
0.04j
<0.08
<0.025
0.4 j,S1
0.064j
AB-01BRL
Bedrock
11/12/2018
6.8
0.10
13
1149
0.30
-93
113
9.4
50.2
50.2
<0.1
<1
8
2470
117
292
2160
38.2
642
296
<0.5
0.082j
272
0.04j
<0.08
<0.025
12.6
0.19
AB-01BRLL
Bedrock
08/29/2018
7.2
0
21
1148
1.30
-103
102
57.1
68.5
68.5
<0.1
0.63j
1720
148 M6
285
1720
36.5
375
2860
0.1j
0.53
329
<0.08
<0.025 MI
1.6
0.69
AB-01BRLL
Bedrock
08/31/2018
6.7
0.00
20
1147
0.40
-118
87
0.0
47.6
47.6
<0.1
<1
<3.1
1970
140
302
1760
38.5
634
56.3j
<0.5
0.12
271
0.022j
<0.08
<0.025
0.18 j,13
0.041j
AB-01BRLL
Bedrock
11/12/2018
6.8
0.00
14
1158
0.40
-42
163
5.3
64.7
64.7
<0.1
<1
5.1
1790
131
294
1850
38
718
151
<0.5
0.098j
323
0.023j
<0.08
<0.025
4
0.13
AB-01D
Transition Zone
02/08/2018
6.0
4.09
13
918
0.50
10
215
1.8
26.8
26.8
<0.1
<1
<2.6
1170
106
221
2650
31.7
554
<100
<0.5
<0.1
449
<0.1
<0.08
<0.025
0.56 S1
14.6
AB-01D
Transition Zone
05/10/2018
5.9
6.12
21
909
0.40
1
206
1.8
25.5
25.5
<0.1
<1
<2.5
1090
87.2
226
2660
37.9
578
<100
<0.5
0.24 S1
442
<0.1
0.055j
<0.025
0.49 j,S1
16.7
AB-01D
Transition Zone
08/13/2018
5.9
2.88
21
912
0.30
91
296
6.3
26.1
26.1
<0.1
<1
<2.5
1190
95.3
223
2660
40.3
584
<100
<0.5
0.085j
452
<0.1
0.056j
<0.025
1.4 S1
22.3
AB-01D
Transition Zone
11/12/2018
6.2
3.21
16
891
0.40
66
271
9.5
29.7
29.7
<0.1
<1
5.6
1230
95
232
2700
41.8
488
279
<0.5
0.26
420
0.026j
0.097
<0.025
0.65 B,S1
19.8
AB-01S
Saprolite
02/08/2018
7.3
6.71
15
349
2.30
63
268
8.0
35.6
35.6
<0.1
<1
<2.5
885
49.9
39.8
422
62.9
230 S1
583
<0.5
1
30
<0.1
<0.08
0.23
<0.5
1.4
AB-01S
Saprolite
05/10/2018
5.9
6.12
30
964
0.20
149
354
8.6
16.1
16.1
<0.1
<1
6.9
4210
97.9
181
908
109
604
406
<0.5
1 Sl
72.7
0.28
0.29
<0.025
1.4 S1
11.4
AB-01S
Saprolite
08/13/2018
5.5
5.95
31
955
0.10
46
251
9.6
7.3
7.3
<0.1
0.52 j
3.6
4840
88.2
199
805
114
680
1040
<0.5
1.9
70.8
0.99
0.39
<0.025
0.27 j,S1
23.9
AB-01S
Saprolite
11/09/2018
4.9
6.05
15
992
0.20
143
348
8.1
1.8 j
1.8 j
<0.1
<1
6.3
5480
87.1
221
785
110
630
1340
<0.5
4.2
65.6
1.9
0.3
<0.025
0.65
30.8
AB-02D
Transition Zone
02/08/2018
6.2
14.31
13
511
0.30
5
210
3.1
75.8
75.8
<0.1
<1
<2.5
472
65.1
4.7
698
149
372
<100
<0.5
0.13 S1
31.7
<0.1
<0.08
0.25
1.2 S1
0.47
AB-02D
Transition Zone
05/11/2018
6.3
13.28
21
509
0.20
101
306
2.6
68.1
68.1
<0.1
<1
<2.5
405 SI
58.4
5
694
169
369 S1
<100
<0.5
0.14 S1
26.2
0.049j
0.039j
0.23
0.68 S1
0.49
AB-02D
Transition Zone
08/07/2018
6.2
13.33
28
522
0.30
43
248
9.5
69.3
69.3
<0.1
<1
<2.5
415
64.2
5.3
710
187
385
<100
<0.5
0.25
33.3
0.046j
0.057j
0.24 S1
1 SS
0.51
AB-02D
Transition Zone
11/06/2018
6.3
13.59
19
525
0.20
-406
-201
4.4
70
70
<0.1
<1
<5
435
66.6
5.5
694
182
387
<100
<0.5
0.11
30.4
0.027j
0.052j
0.3
0.71 B,S1
0.44
AB-02S
Saprolite
02/08/2018
5.5
19.98
8
32
0.40
77
282
1.7
5.2
5.2
<0.1
<1
<2.5
<50
1.16
2.7
8.5
<1
28 S1
<100
<0.5
0.14 S1
29.9
<0.1
<0.08
<0.12 D3
0.58 S1
15.4
AB-02S
Saprolite
05/11/2018
4.9
19.50
25
32
0.20
-3
202
8.8
4.3 j
4.3 j
<0.1
<1
<2.5
<50
1.16
3
10.2
1.8
<25
50.4 j,S1
<0.5
0.16 S1
31.9
0.056 j
0.033 j
<0.025
0.58 S1
15.6
AB-02S
Saprolite
08/07/2018
5.3
19.46
26
35
0.40
-216
-11
4.6
8.8
8.8
<0.1
<1
<2.5
<50
1.24
3.1
9.5
2
41
<100
<0.5
0.17
31.6
0.066 j
0.029 j
<0.025
0.32 j,S1
16.7
AB-02S
Saprolite
11/06/2018
5.5
19.38
20
33
1.00
57
262
2.9
10.5
10.5
<0.1
0.59 j
<2.5
<50
2.31
3.7
15.8
6.7
41
<100
<0.5
0.17
36.7
0.049 j
<0.08
0.045
2.8 S1
14.7
AB-03D
Bedrock
02/07/2018
6.3
20.47
10
401
0.70
81
286
8.8
117
117
<0.1
<1
<2.5
159
31.8
4.4
1230
83.5
279
187
<0.5
0.13
118
<0.1
<0.08
<0.025
2.4 S1
0.18
AB-03D
Bedrock
05/10/2018
6.3
17.46
21
404
0.40
44
249
1.9
106
106
<0.1
<1
<2.5
158
32.4
4.4
1260
94.8
201
114
<0.5
0.096 j,S1
119
<0.1
<0.08
<0.025
0.42 j,S1
0.15
AB-03D
Bedrock
08/08/2018
6.1
16.31
23
399
1.97
379
584
3.2
107
107
<0.1
<1
4.9
175
33.6
4.9
1190
93.7
285
166
0.32j
0.16
128
<0.1
<0.08
<0.025
0.52
0.1
AB-03D
Bedrock
11/07/2018
6.0
16.21
21
410
0.50
83
288
4.4
99.2
99.2
<0.1
0.57j
3.8
161
34.8
4.2
1240
103
313
<100
<0.5
0.22 S1
104
0.016j
<0.08
0.038
1.2 S1
0.15 S1
AB-03S
Ash Pore Water
02/07/2018
4.6
20.23
15
1738
0.20
237
442
9.9
<5
<5
<0.1
<1
2.9
1700
208
25.2
3680
1010
1740
4530
<0.5
1.1
19.8
1.3
0.35
0.076 SI
5.3 S1
68.5
AB-03S
Ash Pore Water
05/10/2018
3.9
16.10
23
1269
0.30
249
454
8.5
<5
<5
<0.1
<1
2.7
687
131
5.1
3080
717
1210
35100
<0.5
2.5 S1
22.8
5.3
0.71
<0.025 P4,R0
0.99 S1
40.5
AB-03S
Ash Pore Water
08/08/2018
4.1
14.40
22
482
0.19
547
752
0.3
<5
<5
<0.1
<1
<2.5
460
49.8
5.9
970
211
424
4860
0.089j
0.26
28.4
1.5
0.12
<0.025 P4,R0
0.35j
5.9
AB-03S
Ash Pore Water
11/07/2018
4.0
15.05
21
615
0.40
306
511
7.8
<5
<5
<0.1
<1
<2.5
754
70.6
3.4
1550
256
536
3150
<0.5
0.45 SI
33.2
1.2
0.11
<0.025
0.62 S1
6.8
AB-04D
Transition Zone
02/07/2018
6.3
17.65
13
177
0.60
43
248
0.5
30.5
30.5
<0.1
<1
<2.5
344
11.5
7.8
234
32.7
142
<100
<0.5
0.19
73.7
<0.1
<0.08
0.028 SI
<0.5
0.45
AB-04D
Transition Zone
05/10/2018
6.0
15.64
24
152
2.10
395
600
0.7
23
23
<0.1
<1
<2.5
374
8.71
8.4
230
33.3
104
<100
<0.5
0.12 S1
67.5
<0.1
<0.08
<0.025
0.14 j,S1
0.2
AB-04D
Transition Zone
08/07/2018
6.1
14.52
28
169
0.66
260
465
1.5
27.9
27.9
<0.1
<1
<2.6
370
10.3
8.7
247
32.4
150
<100
<0.5
0.22
74.9
<0.1
<0.08
<0.025 Al
0.28 j,S1
0.36
AB-04D
Transition Zone
11/06/2018
5.9
14.50
22
170
0.70
10
215
1.7
30.1
30.1
<0.1
<1
<2.5
350
10.9
8.6
243
36.4
147
<100
<0.5
0.18
70.9
0.064 j
<0.08
<0.025
0.42 j,B,SI
0.4
AB-04S
Ash Pore Water
02/07/2018
6.6
13.29
17
181
0.20
93
298
4.3
55.9
55.9
<0.1
<1
<5
150
19.6
6.2 A1,R1
365
22.4 Al
124
102 S1
<0.5
6.7
138
<0.1
<0.08
<0.025 MS
<0.5
0.96
AB-04S
Ash Pore Water
05/10/2018
5.9
9.72
19
259
167.00
493
698
3.0
20.3
20.3
<0.1
<1
<2.5
316
24.8
6.1
585
84.7
157
<100
0.25j
1 S1
52.3
<0.1
0.033j
0.27 SI
0.33 j,S1
0.069j
AB-04S
Ash Pore Water
08/07/2018
5.9
8.32
29
196
0.31
393
598
4.4
22
22
<0.1
<1
<2.6
221
18.6
6.6
542
50.3
153
<100
0.29j
1.8
74.9
0.041j
0.064j
<0.025
<0.5
0.2
AB-04S
Ash Pore Water
11/06/2018
5.8
8.36
26
223
0.20
121
326
1.3
29.1
29.1
<0.1
<1
<2.5
226
25.4
5.3
644
60.5
163
<100
0.58
3.4
76.1
0.025j
0.16
<0.025
0.61 B,S1
1.1
AB-04SL
Ash Pore Water
02/07/2018
8.2
13.65
12
256
0.70
-107
98
4.1
85.8
85.8
<0.1
<1
62
717
33
7.8
752
30
155
1060
<0.5
999
95.7
<0.1
<0.08
<0.025
0.61 S1
0.3
AB-04SL
Ash Pore Water
05/10/2018
8.0
10.02
28
254
0.77
320
525
0.6
93.1
93.1
<0.1
0.56 j
<2.5
583
29.6
8.2
805
31.3
123
132
0.14 j
1050
89.6
<0.1
<0.08
<0.025 M1
<0.5
0.24
AB-04SL
Ash Pore Water
08/07/2018
8.1
8.53
32
270
0.72
167
372
1.0
78.2
78.2
0.061j
<1
<2.6
652
33
8.4
858
35.3
158
178
0.17j
1040
94.3
<0.1
<0.08
<0.025
0.16 j,S1
0.25
AB-04SL
Ash Pore Water
11/06/2018
8.2
9.64
23
254
0.30
-166
39
2.2
83.2
83.2
0.064 j
0.53 j
<2.5
588
33.7 Al
8.4 M1
797
36.3 M1
144
163
0.18 j
1040 M6
91.7
0.14
<0.08
<0.025
0.79 B,S1
0.41
AB-05BR
Bedrock
02/07/2018
5.8
8.92
11
684
1.00
77
282
0.0
SOS
SOS
<0.1
1.1
<2.5
<50
63.7
1.5
3060
197
600
<100
<0.5
0.28
99.7
<0.1
<0.08
0.087 SI
0.96 SI
1
AB-05BR
Bedrock
05/10/2018
5.6
7.96
21
826
0.81
321
526
7.3
83.7
83.7
<0.1
0.88 j
<2.5
<50
89.2
1.5
4390
367
651
<100
<0.5
0.31 S1
68.8
0.05 j
<0.08
5.5
j 7
1 1.2
AB-05BR
Bedrock
08/07/2018
6.0
7.90
32
638
1.58
343
548
4.6
157
157
<0.1
0.86j
<2.5
<50
55.9
2
2860
156
437
<100
0.18j
0.3
143
<0.1
<0.08
2.3 M6,R1
2.5
0.18
AB-05BR
Bedrock
11/06/2018
5.5
10.20
19
963
0.20
71
2761
1.0
1 83.5
1 83.5
1 <0.1
1 1.1
1 <2.5
<50
114
1.6
5020
417
371
52.1 j
<0.5
0.43
67.3
0.058 j
<0.08
<0.025
0.91 B,S1
1.8
Page 1 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
Copper
Iron
Lead
Lithium
Magnesium
Manganese
Mercury
Molybdenum
Nickel
Nitrate
+ Nitrite
Potassium
Selenium
Sodium
Thallium
Vanadium
Zinc
Aluminum
(0.45u)
Antimony
(0.45u)
Arsenic
(0.45u)
Barium
(0.45u)
Beryllium
(0.45u)
Boron
(0.45u)
Cadmium
(0.45u)
Chromium
(0.45u)
Cobalt
(0.45u)
Copper
(0.45u)
Iron
(0.45u)
Reporting Units
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
mg-N/L
mg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
1000
300
15
NE
NE
50
1
NE
100
NE
NE
20
NE
0.2*
0.3*
1000
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Shallow Unit)
3.8
744
0.3
NE
1.8
75.3
0.2
0.5
9.9
2.7
5
0.5
9.1
0.1
5.6
19.2
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Deep Unit)
2.8
272
0.1
NE
14.4
141
0.2
3.2
7.5
1.4
7.8
0.5
29.2
0.1
3.8
17
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Bedrock Unit)
4.2
792
0.2
NE
1.3.2
26.6
0.2
3
7.2
0.4
9.8
0.5
14
1 0.1
16
1 11.9
NE
NE
NE
NE
NE
NE
NE
NE
I NE
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
AB-01BR
Bedrock
02/08/2018
<0.5
6960
<0.1
23.4
33.1
444
<0.2
<0.5
0.63 SI
0.042
6.68
<0.5
23.3
<0.1
<0.3
31.8
<100
<0.5
0.22
62.2
<0.1
1740
<0.08
<0.5
1.5
<0.5
6560
AB-01BR
Bedrock
05/10/2018
0.27 j,S1
7330
<0.1
20.7
33.6
466
<0.2
0.29 j,S1
0.81
0.013 j
6.59
<0.5
22.5
<0.1
<0.3
34.3
<100
<0.5
0.23
69.9
0.049 j
2360
<0.08
<0.5
1.4
0.12 j,S1
7550
AB-01BR
Bedrock
08/13/2018
<0.5
6780
0.076 j,B
21.2
33.7
604
<0.2
0.27 j
0.86 SI
0.027
6.76
<0.5
22.2
<0.1
0.12 j,S1
69.7
<100
<0.5
0.15
64.5
0.038 j
2370
<0.08
<0.5
3.7
0.51 B
5990
AB-01BR
Bedrock
11/12/2018
0.57 51
8720
0.4
18.3
35.8
674
<0.2
0.36 j
1.7
<0.02
7.42
<0.5
21.7
<0.1
1.2
61.2
<100
<0.5
0.18
80.2
0.043 j
3220
<0.08
<0.5
3.2
0.28 j,BC,Sl
7400
AB-01BRL
Bedrock
02/08/2018
<0.5
6880
<0.1
17.9
28.8
1070
<0.2
<0.5
<0.5
<0.02
6.65
<0.5
22.7
<0.1
<0.3
<10
<100
<0.5
0.22
317
<0.1
1850
<0.08
<0.5
<0.1
<0.5
6420
AB-01BRL
Bedrock
04/11/2018
0.27 j,B
7330
0.033 j,B
16.4
31.5
859
<0.2
0.36 j
0.66
0.013 j
7.68
<0.5
24.2
<0.1
<0.3
3.5 j
<111
<1
0.15 j
286
0.042 j
1990
<0.16
0.41 j
0.072 j
14.4
7790
AB-01BRL
Bedrock
05/10/2018
<0.5
7060
<0.1
17.1
29.9
1100
<0.2
0.23 j,S1
0.82
0.011 j
6.85
<0.5
23
<0.1
<0.3
<10
<100
<0.5
0.21
302
0.046 j
2120
<0.08
<0.5
0.044 j
<0.5
7190
AB-01BRL
Bedrock
08/13/2018
0.14 j,B,51
8480
0.19 B
15.9
26
860
<0.2
4.2
0.25 j,51
0.031
7.59
<0.5
24.3
<0.1
0.41 S1
4.5 j,B
<100
<0.5
0.11
190
<0.1
1660
<0.08
<0.5
<0.1
0.25 j,B
7200
AB-01BRL
Bedrock
11/12/2018
0.8 Sl
8410
0.27
13.9
30.4
770
<0.2
2
5.8
<0.02
7.99
<0.5
23.8
<0.1
0.57
<10
<100
<0.5
<0.1
260
0.013 j
2280
<0.08
14
0.21
0.12 j,BC,SI
7630
AB-01BRLL
Bedrock
08/29/2018
3.2
8650
1.8
15.2 N2,R0
26.3
1480
0.9
0.025
8.01
<0.5
23
0.04j
11
<0.5
0.29
269
0.015j
1560
<0.08
0. 19j
0.24
3760
AB-01BRLL
Bedrock
08/31/2018
<0.5
7140
<0.1
14.4 N2,R0
26
1380
0.09 j,B
0.18 j
<0.5
0.024
7.32
<0.5
22.1
<0.1
<0.3
3.3 j,B
<100
<0.5
0.1
260
<0.1
1700
<0.08
0.1 j
0.027 j
0.12 j
6310
AB-01BRLL
Bedrock
11/12/2018
0.32 j,S1
5360
<0.1
12.1
24.2
1880
<0.2
0.2 j
1.9
<0.02
7.19
<0.5
21.9
<0.1
0.3
<10
<100
<0.5
0.067 j
309
<0.1
1690
<0.08
2.7
0.098 j
<0.5 BC
4880
AB-01D
Transition Zone
02/08/2018
0.74 Sl
432
<0.1
23.5
25.1
16.6
<0.2
<0.5
1.1 sl
<0.02
7.51
<0.5
24.2
<0.1
0.53 S3
<10
<100
<0.5
<0.1
412
<0.1
981
<0.08
0.78
11.5
0.74 SI
216
AB-01D
Transition Zone
05/10/2018
0.47 j,S1
446 S3
<0.1
20.1
23.2
15.1
0.09 j
0.092 j,S1
1
<0.02
7.01
0.27 j
21.2
<0.1
0.5 Sl
3.4 j
<100
<0.5
0.083 j
427
<0.1
1090
0.057 j
0.15 j
14.7
0.57 S1
242
AB-01D
Transition Zone
08/13/2018
0.77 B,S1
574
0.15 B
19.9
23.8
13.4
0.18 j
0.098 j
1.4 SI
<0.02
7.49
0.27 j
23.9
<0.1
0.65 S1
4.9 j,B
<100
<0.5
0.059 j
379
<0.1
1030
0.047 j
0.21 j
18.9
2.8 B
217
AB-01D
Transition Zone
11/12/2018
1.4
614
0.32
16.8
23.2
45.5
0.39
0.59
1.8
<0.02
8.12
0.47 j
23.1
<0.1
1.4
72.1
<100
<0.5
0.16
385
0.01 j
1120
0.096
0.29 j
17.7
1.4 BC,51
157 S1
AB-01S
Saprolite
02/08/2018
0.75 SI
461
0.18 SI
0.76
5.12
436
<0.2
3
<0.5
0.49
11.5
2.1
<5
0.1
3.8
11.8
<100
<0.5
0.81
31
<0.1
1020
<0.08
<0.5
1.8
<0.5
<50
AB-015
Saprolite
05/10/2018
0.62 Sl
373 S1
0.21
1.3 Sl
29.5
3580
<0.2
0.94 Sl
1.5
0.054
13.2
0.75
7.2
0.28
1.2
65.1
269
<0.5
0.79
73.3
0.25
4210
0.32
0.32 j
11.1
0.7 Sl
294
AB-01S
Saprolite
08/13/2018
0.79 B,S1
760
0.44 B
1.6
33.3
4380
<0.2
0.81
1.3 Sl
0.13
9.69
1.2
7.7
0.38
1 SS
118
499
<0.5
1.9
59.7
0.98
4300
0.36
<0.5
23.9
1 B
213
AB-01S
Saprolite
11/09/2018
1.3
1390
1.1
1.4 j
37.2
4850
<0.2
0.13 j
1.9
<0.02
7.01
1.5
7.62
0.44
1.2
49.4
1160
<0.5
3.9
64.3
1.9
5170
0.26
0.2 j,S1
29.4
1.3 S1
1060
AB-02D
Transition Zone
02/08/2018
2.2 S1
184
<0.1
7.2
17.7
43.7
<0.2
<0.5
0.92 SI
0.069
<5
<0.5
14.5
<0.1
0.36S1
<10
<100
<0.5
0.1
30.2
<0.1
409
<0.08
<0.5
0.49
1.9 S1
52.2
AB-02D
Transition Zone
05/11/2018
1.5
208
0.1 51
8.2
16.2
40.7
<0.2
0.15 j,S1
0.66
0.061
4.46 j
0.51
13.3
<0.1
0.33 B,S1
<10
<100
<0.5
0.059 j
30
0.041 j
422
0.044 j
0.35 j,S1
0.49
1.4 S1
45.8 j
AB-02D
Transition Zone
08/07/2018
2.6
804
0.12
7.7
17.4
39
<0.2
0.15 j
0.64
0.058
4.68 j
0.48 j
14.8
<0.1
0.67
71.8
<100
<0.5
0.11
31.2
0.043 j
408
0.059 j
0.53
0.5
2.3
131
AB-02D
Transition Zone
11/06/2018
1.9 51
140
<0.1
7.5
17.6
40.1
0.08 j
0.14 j
0.66
0.055
4.2 j
0.45 j
14.8
<0.1
0.45S1
2.7 j
<100
<0.5
0.089 j
29
0.019 j
398
<0.08
0.57 B,S1
0.41
1.7
42.5 j
AB-02S
Saprolite
02/08/2018
0.67 SI
1430
0.13 SI
<0.5
0.61
888
<0.2
<0.5
0.88 SI
<0.02
<5
<0.5
<5
0.19
<0.3
<10
<100
<0.5
0.21
30.4
<0.1
<50
<0.08
1.3
14.8
0.56 S1
1220
AB-02S
Saprolite
05/11/2018
0.15 j
1300
0.19 51
0.44 j
0.584
828
<0.2
<0.5
0.81
<0.02
<5
<0.5
1.53 j
0.19
0.1 j,B,SI
2.9 j
<100
<0.5
0.062 j
62.3
0.097 j
<50
0.028 j
<0.5
16
0.7 Sl
752
AB-02S
Saprolite
08/07/2018
0.23 j
1510
0.075 j
0.42 j
0.618
875
<0.2
<0.5
0.61
<0.02
<5
<0.5
1.8 j
0.2
<0.3
4.4 j,S1
<100
<0.5
0.16
62.8
0.088 j
<50
0.036 j
0.44 j
17.5
1.3 S1
1340
AB-02S
Saprolite
11/06/2018
0.68 51
1120
0.094 j
0.55 j,B
0.871
796
<0.2
<0.5
1.8
0.041
<5
<0.5
1.87 j
0.16
0.072 j,S1
6.8 j
<100
<0.5
0.15
62.8
0.1
<50
0.052 j
1.3 B
10.7
0.89 S1
776
AB-03D
Bedrock
02/07/2018
1.1 Sl
222
<0.1
12.3
16.9
90
<0.2
<0.5
4.6
0.04
5.15
<0.5
17.8
<0.1
2.3
<10
537
<0.5
0.56
112
<0.1
150
<0.08
0.53
0.21
1.4 S1
849
AB-03D
Bedrock
05/10/2018
1.9 51
119 51
0.034 j
11.4
17.5
54
<0.2
0.19 j,S1
1.2
0.062
4.95 j
<0.5
16.9
<0.1
2.6
25.9 B
<100
<0.5
0.11
100
<0.1
146
<0.08
<0.5
0.15
3.1
<50
AB-03D
Bedrock
08/08/2018
1.7
158
0.076 j
13.8
17.2
38.2
<0.2
0.25 j
3.3
0.049
5.67
<0.5
18.3
<0.1
1.8
16.4 B
<100
0.17 j
0.12 S1
109
<0.1
158
<0.08
0.33 j,S1
0.092 j
2.2 S1
<50
AB-03D
Bedrock
11/07/2018
2.3
73.1
<0.1
12.2
17.9
35
<0.2
0.25 j,S1
0.97
0.083
5.1
<0.5
18.7
<0.1
2.5
3.4 j,B
<100
<0.5
0.12
89.3
<0.1
145
<0.08
0.33 j,B,SI
0.12
2.1 S1
<50
AB-03S
Ash Pore Water
02/07/2018
65.9
176000
0.14
333
37.8
4070
<0.2
1.4
187
0.13
26.3
1.1
14.2
5.4
<0.3
234
3290
<0.5
0.86
18
1.1
1480
0.35
4.8
72.7
53.6
188000
AB-03S
Ash Pore Water
05/10/2018
69.8
6610
0.35 51
298
31.6
1070
<0.2
0.46 j,S1
119
0.86
22.6
11.1
11
5
0.28 j,S1
109
31200
<0.5
2.9 S1
18.2
5.4
632
0.75
1.8
41.2
91.2
6160
AB-03S
Ash Pore Water
08/08/2018
14.9
558
0.076 j
97.7
11.2
260
<0.2
<0.5
20.2
0.48
10.9
9.3
7.59
2.3
<0.3
20.1 B
4460
<0.5
0.26 SI
25.5
1.5
421
0.1
0.4 j,S1
6.1
16.3
524
AB-03S
Ash Pore Water
11/07/2018
15.3
728
0.16
151
13.9
285
<0.2
0.32 j,S1
24.7
1.7
13.9
7.6
8.17
2.8
0.46
19.9 B
2710
<0.5
0.32
29.2
1.3
687
0.12
0.89 B,S1
6.7
15.8
158
AB-04D
Transition Zone
02/07/2018
<0.5
1790
<0.1
12.4
5.61
73.5
<0.2
<0.5
3.6
<0.02
<5
<0.5
10.7
<0.1
<0.3
<10
<100
<0.5
0.18
65.7
<0.1
313
<0.08
<0.5
0.45
<0.5
1880
AB-04D
Transition Zone
05/10/2018
0.2 j,S1
420 S3
<0.1
13.1
4.46
24.7
<0.2
0.22 j,S1
1.8
<0.02
3.82 j
<0.5
9.87
<0.1
<0.3
5 j
<100
<0.5
0.18
65.5
0.071 j
333
<0.08
<0.5
0.36
<0.5
1390
AB-04D
Transition Zone
08/07/2018
0.15 j,B
1370
0.041 j
12.5
5.03
54.9
<0.2
0.069 j
1.6
<0.02
4.36 j
<0.5
11.6
<0.1
<0.3
3 j,B,SI
<100
<0.5
0.22
65.9
0.053 j
332
<0.08
0.24 j
0.41
<0.5
1480
AB-04D
Transition Zone
11/06/2018
0.48 j,S1
1740
<0.1
11.6
5.19
68.2
<0.2
<0.5
1.6
<0.02
3.81 j
<0.5
11.2
<0.1
0.094 j,S1
2.6 j
<100
<0.5
0.18
63.8
0.22 Sl
312 B
<0.08
0.18 j,B,SI
0.41
0.33 j,S1
1580
AB-04S
Ash Pore Water
02/07/2018
<0.5
360 S3
<0.1
20
5.58
1240
<0.2
4.2
2.8
<0.02
<5
0.66
5.63
0.26
2.1
<10
<100
<0.5
5.5
123
<0.1
140
<0.08
<0.5
1
0.58 S1
208
AB-04S
Ash Pore Water
05/10/2018
0.26 j,51
111 51
<0.1
54.5
6.4
22
<0.2
3.3
3.8
0.55
7.88
31.5
4.61 j
0.35
0.85
4.6 j
<100
0.26 j
0.36
45.2
<0.1
276
<0.08
0.34 j
0.068 j
0.44 j,S1
<50
AB-04S
Ash Pore Water
08/07/2018
0.3 j,B
58.8
0.18
64.7
4.12
73
<0.2
1.2
7
0.087
6.98
16
5.34
1.2
1.7
7.5 j,B,SI
<100
0.25 j
1.4
66.5
<0.1
208
0.04 j
<0.5
0.2
0.75 S1
<50
AB-04S
Ash Pore Water
11/06/2018
1.7 51
97.5
<0.1
63.1
5.33
183
<0.2
1.3
7.1
0.014 j
5.71
2
5.5
1
2.2
8 j
<100
0.23 j
2.6
69.7
0.047 j
215 B
0.052 j
0.34 j,B,SI
1
1.3
<50
AB-04SL
Ash Pore Water
02/07/2018
<0.5
526
<0.1
92.5
4.88
31.6
<0.2
42.6
8.5
<0.02
6.25
<0.5
8.5
<0.1
0.66
<10
512
<0.5
1070
92.6
<0.1
623
<0.08
0.51
0.35
<0.5
241
AB-04SL
Ash Pore Water
05/10/2018
<0.5
58.4 51
<0.1
90.2
5.17
32.1
<0.2
38.9
6.1
<0.02
4.91 j
0.46 j
7.63
<0.1
0.27 j,S1
<10
138
0.14 j
1100
98.8
<0.1
584
<0.08
<0.5
0.2
<0.5
40.9 j
AB-04SL
Ash Pore Water
08/07/2018
<0.5
72.7
0.09 j
86.5
5.29
30.5
<0.2
43.9
7
<0.02
6.21
0.27 j
8.56
<0.1
0.24 j,S1
<10
145
0.13 j
1050
91.4
<0.1
608
<0.08
<0.5
0.21
0.18 j,S1
48.4 j
AB-04SL
Ash Pore Water
11/06/2018
0.25 j,S1
82.2
0.21
91.8
5.18
25
0.07 j
44.5
7.7
<0.02
5.26
0.44 j
7.72
0.066 j
0.43 S3
<10
158
<0.5
985
89.1
0.021 j
664
<0.08
0.34 j,B,SI
0.22
IA SI
75.8
AB-05BR
Bedrock
02/07/2018
0.76 SI
235
<0.1
35
27.1
101
<0.2
<0.5
13
<0.02
10.7
<0.5
24.2
<0.1
<0.3
12.2
<100
<0.5
0.22
70.2
<0.1
<50
<0.08
<0.5
1
0.55 S1
125
AB-05BR
Bedrock
05/10/2018
0.31 j,S1
291 Sl
<0.1
23
38.3
136
<0.2
0.21 j,S1
16.5
<0.02
8.59
<0.5
24.3
<0.1
<0.3
1 11.2
<100
<0.5
0.19
68.6
0.051 j
<50
<0.08
9.1
0.76
1.2 S1
70.9
AB-05BR
Bedrock
08/07/2018
0.8 B
60.5
0.062 j
140
21
31
<0.2
0.33 j
7.2
0.058
32.6
0.28 j
32.6
<0.1
1 <0.3
24.5 B,S1
<100
1 0.15 j
0.26
120
<0.1
<50
<0.08
2.2
0.048 j
1.1 SS
<50
AB-05BR
Bedrock
11/06/2018
0.67 51
1 411
<0.1
23.6
46.1
187
<0.2
0.14 j
17.1
0.11
9.58
<0.5
28.9
<0.1
I 0.26 j,S1
1 16.8
1 <100
1 <0.5
0.23
59.4
0.064 j
150
<0.08
0.24 j,B,SI
1.2
0.85 S1
203
Page 2 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
RADIONUCLIDES
OTHER PARAMETERS
Lead
(0.45u)
Manganese
(0.45u)
Mercury
(0.45u)
Molybdenum
(0.45u)
Nickel
(0.45u)
Phosphorus
(0.45u)
Selenium
(0.45u)
Silver
(0.45u)
Strontium
(0.45u)
Thallium
(0.45u)
Vanadium
(0.45u)
Zinc
(0.45u)
Radium-226
Radium-228
Total
Radium
Uranium-238
Total
Uranium
Uranium-238
DIS
Carbonate
Alkalinity
Fluoride
Phosphorus
Reporting Units
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pCi/L
pCi/L
pCi/L
ug/mL
ug/mL
ug/mL
mg/L
mg/L
mg/L
15A NCAC 02L Standard
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
SA
NE
0.03A
NE
NE
2
NE
Background Threshold Values (Shallow Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
3
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Deep Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
2.8
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Bedrock Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5.7
NE
0.0005
NE
5
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
AB-OIBR
Bedrock
02/08/2018
<0.1
422
<0.2
<0.5
0.57
<0.05
<0.5
NA
1800
<0.1
<0.3
34.4
2.96
7.43
10.39
<0.0005
<0.0005
NA
<5
<0.1
<0.05
AB-01BR
Bedrock
05/10/2018
<0.1
481
<0.2
0.27j
0.71 B,SI
<0.05
<0.5
NA
1960
<0.1
0.16 j,B
34
5.23
10.7
15.9
0.000063j
0.000063j
0.000048j
<5
0.082j
0.033j
AB-OIBR
Bedrock
08/13/2018
<0.1
543
<0.2
0.32 j,B
0.81
0.035j
<0.5
NA
1940
<0.1
<0.3
63
3.93
10.9
14.8
<0.0005
<0.0005
<0.0005
<5
0.083j
0.036j
AB-01BR
Bedrock
11/12/2018
<0.1
610
<0.2
0.3 j,B
1.2
0.046 j
<0.5
NA
2080
<0.1
<0.3
52.7
6.88
7.23
14.1
NA
0.00028 j
NA
<5
0.089 j
0.067
AB-01BRL
Bedrock
02/08/2018
<0.1
1010
<0.2
<0.5
<0.5
<0.05
<0.5
NA
1920
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.11
<0.05
AB-01BRL
Bedrock
04/11/2018
<0.1
910
<0.2
0.27 j
<1
<0.05
<0.5
NA
2040
<0.1
<0.6
3.2 j
4.78
12.1
16.9
<0.0005
<0.0005
NA
<5
0.1
<0.05
AB-01BRL
Bedrock
05/1O/2018
<0.1
1020
<0.2
0.26j
0.82 B,SI
<0.05
<0.5
NA
1920
<0.1
0.072 j,B
<10
NA
NA
NA
NA
NA
NA
<5
0.091j
<0.05
AB-01BRL
Bedrock
08/13/2018
<0.1
762
<0.2
4.5
0.19j
0.052
<0.5
NA
1600
<0.1
<0.3
<10
2.41
1.23
3.64
<0.0005
<0.0005
<0.0005
<5
0.067j
0.038j
AB-01BRL
Bedrock
11/12/2018
<0.1
713
<0.2
1.6 B
10.4
0.045 j
<0.5
NA
1890
<0.1
<0.3
<10
4.88
10.3
15.2
NA
<0.0005
NA
<5
0.068 j
0.051
AB-OIBRLL
Bedrock
08/29/2018
280
1.1
0.78
<0.05
<0.5
NA
<0.1
0.31
8.2j
AB-OIBRLL
Bedrock
08/31/2018
<0.1
1250
0.11 j,B
0.13 j
<0.5
0.034 j
<0.5
NA
1600
<0.1
<0.3
4.5 j
2.82
2.47
5.29
NA
NA
NA
<5
0.05 j
0.062
AB-OIBRLL
Bedrock
11/12/2018
<0.1
1660
<0.2
0.19 j,B
2.5
0.038 j
<0.5
NA
1580
<0.1
<0.3
<10
1.23
3.15
4.38
NA
<0.0005
NA
<5
0.094 j
0.047 j
AB-01D
Transition Zone
02/08/2018
<0.1
13.2
<0.2
<0.5
1.4
<0.05
<0.5
NA
2360
<0.1
0.44
<10
0.623
0.652
1.275
<0.0005
<0.0005
NA
<5
<0.1
<0.05
AB-01D
Transition Zone
05/10/2018
<0.1
13.5
<0.2
<0.5
0.89 S3
<0.05
0.24 j
NA
2420
<0.1
0.57
3.1 j
1.27
0.794
2.06
<0.0005
<0.0005
<0.0005
<5
<0.1
0.029 j
AB-01D
Transition Zone
08/13/2018
<0.1
10.5
<0.2
0.12 j,B
0.88
0.056
0.27 j
NA
2330
<0.1
0.5
4.5 j
0.196 U
2.04
2.24
<0.0005
<0.0005
<0.0005
<5
<0.1
0.14
AB-01D
Transition Zone
11/12/2018
<0.1
33.8
<0.2
0.47 j,B
1.7
0.077
0.42 j
NA
2270
<0.1
0.6
56
1.44
1.21
2.65
NA
0.00062
NA
<5
0.072 j
0.095
AB-01S
Saprolite
02/08/2018
<0.1
540
<0.2
2.5
<0.5
<0.05
2
NA
428
0.12
3.1
11.1
0.312
0.69
1.002
0.002
0.002
NA
<5
0.21
<0.05
AB-OI5
Saprolite
05/10/2018
0.16
3420
<0.2
0.94
1.6SI
<0.05
0.66
NA
880
0.29
1.2
72.9
0.132 U
2.21
2.34
0.00056
0.00056
0.00045j
<5
0.37
0.044j
AB-01S
Saprolite
08/13/2018
0.29
3880
<0.2
0.83
1.2
0.043j
1.3
NA
724
0.4
0.71
82.8
0.338 U
2.35
2.69
0.00066
0.00066
0.00054
<5
0.69
0.046j
AB-01S
Saprolite
11/09/2018
0.78
4790
<0.2
0.12 j
2.2
<0.05
1.5
NA
709
0.42
0.57
55.4
0.59 SI
1.62
2.21
NA
0.00082
NA
<5
1.3
<0.05
AB-02D
Transition Zone
02/08/2018
<0.1
36.2
<0.2
<0.5
0.73
<0.05
0.53
NA
617
<0.1
0.32
<10
1.23
2.95
4.18
0.002
0.002
NA
<5
0.12
<0.05
AB-02D
Transition Zone
05/11/2018
0.042j
39.8
<0.2
0.15j
0.62 S3
<0.05
0.54
NA
725
<0.1
0.4 S3
<10
0.312 U
2.91
3.22
0.0021
0.0021
0.0017
<5
0.13
<0.05
AB-02D
Transition Zone
08/07/2018
0.077 j
35.1
<0.2
0.16 j
0.57
0.076
0.5
NA
624
<0.1
0.34
60.6
0.446 U
2.76
3.21
0.0023
0.0023
0.002
<5
0.13
0.039 j
AB-02D
Transition Zone
11/06/2018
<0.1
35.1
<0.2
0.14 j
0.63
0.11
0.48 j
NA
633
<0.1
0.39
<10
0.545
2.29
2.84
NA
0.002
NA
<5
0.13
0.027 j
AB-02S
Saprolite
02/08/2018
<0.1
772
<0.2
<0.5
2.6
<0.05
<0.5
NA
10.4
0.16
<0.3
<10
0.0595
1.43
1.4895
<0.0005
<0.0005
NA
<5
<0.1
<0.05
AB-02S
Saprolite
05/11/2018
<0.1
899
<0.2
<0.5
0.98 sl
<0.05
0.71
NA
44.5
0.19
<0.3
8.7 j
0.0518 U
1.09 U
1.14 U
<0.0005
<0.0005
<0.0005
<5
0.069 j
<0.05
AB-02S
Saprolite
08/07/2018
0.049 j
913
<0.2
<0.5
1
<0.05
0.92
NA
49.8
0.18
<0.3
6.2 j
0 U
1.53
1.53 U
<0.0005
<0.0005
<0.0005
<5
0.07 j
<0.05
AB-02S
Saprolite
11/06/2018
<0.1
609
<0.2
<0.5
1.5
<0.05
0.92
NA
57.9
0.13
0.072 j
7.3 j
0.175 U
0.432 U
0.607 U
NA
<0.0005
NA
<5
0.09 j
<0.05
AB-03D
Bedrock
02/07/2018
<0.1
77.8
<0.2
<0.5
4
<0.05
<0.5
NA
1150
<0.1
2.7
<10
NA
NA
NA
NA
NA
NA
<5
0.1
<0.05
AB-03D
Bedrock
05/1O/2018
<0.1
49.8
<0.2
0.2 j
I S3
<0.05
<0.5
NA
1080
<0.1
2.5
3.4 j
NA
NA
NA
NA
NA
NA
<5
0.13
0.03 j
AB-03D
Bedrock
08/08/2018
0.047 j
29.1
<0.2
0.23 j,SI
2.1 SI
0.038 j
<0.5
NA
1080
<0.1
2.7
9.8 j,B
NA
NA
NA
NA
NA
NA
<5
0.14
0.11
AB-03D
Bedrock
11/07/2018
<0.1
38.1
<0.2
0.17 j
0.92
0.03 j
<0.5
NA
1170
<0.1
2.3
<10
NA
NA
NA
NA
NA
NA
<5
0.09 j
0.03 j
AB-03S
Ash Pore Water
02/07/2018
0.11
3920
<0.2
1.5
194
<0.05
2.4
NA
3440
4.7
<0.3
226
NA
NA
NA
NA
NA
NA
<5
0.19
<0.05
AB-03S
Ash Pore Water
05/1O/2018
0.14
1020
<0.2
0.24j
125
<0.05
10.7
NA
2610
5.2
<0.3
122
NA
NA
NA
NA
NA
NA
<5
0.14
<0.05
AB-03S
Ash Pore Water
08/08/2018
0.1
241
<0.2
0.29 j,SI
20.8
<0.05
9.2
NA
888
2.3
<0.3
17.6 B
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
AB-03S
Ash Pore Water
11/07/2018
0.11
269
<0.2
<0.5
24.5
<0.05
7.7
NA
1420
2.9
0.27 j,B,S1
30.6
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
AB-04D
Transition Zone
02/07/2018
<0.1
74.2
<0.2
<0.5
3
<0.05
<0.5
NA
235
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.27
<0.05
AB-04D
Transition Zone
05/1O/2018
<0.1
57
<0.2
0.15 j
1.5 s1
<0.05
<0.5
NA
222
<0.1
0.081 j
<10
NA
NA
NA
NA
NA
NA
<5
0.36
<0.05
AB-04D
Transition Zone
08/07/2018
<0.1
60.1
<0.2
0.079 j
1.6
<0.05
<0.5
NA
217
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.33
0.031 j
AB-04D
Transition Zone
11/06/2018
0.28SI
64.6
<0.2
<0.5
2.2
<0.05
<0.5
NA
217
0.05 j
0.095 j
7.8 j
NA
NA
NA
NA
NA
NA
<5
0.31
0.07 SI
AB-04S
Ash Pore Water
02/07/2018
0.38 SI
1200
<0.2
4.2
3.1
<0.05
0.72
NA
375
0.28
1.9
<10
NA
NA
NA
NA
NA
NA
<5
<0.1 RI
<0.05
AB-04S
Ash Pore Water
05/1O/2018
<0.1
21
<0.2
2.9
4.3
<0.05
29.8
NA
513
0.38
0.55
4.2 j
NA
NA
NA
NA
NA
NA
<5
0.061 j
<0.05
AB-04S
Ash Pore Water
08/07/2018
0.12
67
<0.2
1.1
6.9
<0.05
15.6
NA
478
1.1
1.3
5.7 j,B
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
AB-04S
Ash Pore Water
11/06/2018
<0.1
184
<0.2
1.3
6.9
<0.05
2
NA
586
0.95
1.5
5.6 j
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
AB-04SL
Ash Pore Water
02/07/2018
0.11
30.6
<0.2
45.5
8.7
0.37
<0.5
NA
758
<0.1
0.95
<10
NA
NA
NA
NA
NA
NA
<5
0.4
0.43
AB-04SL
Ash Pore Water
05/10/2018
<0.1
29.8
<0.2
39.1
6.8
0.27
0.52
NA
845
<0.1
0.32
<10
NA
NA
NA
NA
NA
NA
<5
0.45
0.37
AB-04SL
Ash Pore Water
08/07/2018
<0.1
30.9
<0.2
40.2
6.7
0.51
0.26 j
NA
765
<0.1
0.14 j
3.4 j,B
NA
NA
NA
NA
NA
NA
<5
0.39
0.55
AB-04SL
Ash Pore Water
11/06/2018
<0.1
24.7
<0.2
42.5
7.2
0.25
0.41 j
NA
769
<0.1
0.29 j
<10
NA
NA
NA
NA
NA
NA
<5
0.42 M1
0.28
AB-05BR
Bedrock
02/07/2018
<0.1
III
<0.2
<0.5
16.4
<0.05
<0.5
NA
3700
<0.1
<0.3
11.3
0.511
1.92 B,SI
2.431
<0.0005
<0.0005
NA
<5
<0.1
<0.05
AB-05BR
Bedrock
05/10/2018
<0.1
89.1
<0.2
0.18 j
18.8
<0.05
0.61
NA
4070
<0.1
<1.5 D3
7.8 j
0.269 U
2.41
2.68
<0.0005
<0.0005
<0.0005
<5
0.093 j
<0.05
AB-05BR
Bedrock
08/07/2018
<0.1
<5
<0.2
0.35 j
7.1
<0.05
0.26 j
NA
2310
<0.1
<0.3
20.9
0.254 U
2.92
3.17
<0.0005
<0.0005
<0.0005
<5
0.11
<0.05
AB-05BR
Bedrock
11/06/2018
<0.1
144
<0.2
0.12 j
16.7
0.029 j
<0.5
NA
4530
0.018 j
0.17 j
13.6
0.608 U
2.9
3.51
NA
<0.0005
NA
<5
0.091 j
1 0.031 j
Page 3 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
FIELD PARAMETERS
WATER QUALITY PARAMETERS
SELECTED 40CFR257 APPENDIX III CONSTITUENTS plus Sr
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
PH
Water
Level
Temp
Spec
Cond
DO
ORP
Eh
Turbidity
Alkalinity
Bi-
carbonate
Alkalinity
Sulfide
Total
Organic
Carbon
Total
Suspended
Solids
Boron
Calcium
Chloride
Strontium
Sulfate
Total
Dissolved
Solids
Aluminum
Antimony
Arsenic
Barium
Beryllium
Cadmium
Chromium
(VI)
Chromium
Cobalt
Reporting Units
S.U.
ft
Deg C
pmhos/cm
mg/L
mV
mV
NTUs
mg/L
mg/L
mg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
6.5-8.5
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
700
NE
250
NE
250
Soo
NE
1*
10
700
4*
2
10
10
1*
Background Threshold Values (Shallow Unit)
4.6-6.4
NE
NE
NE
NE
NE
NE
NE
63
63
0.1
1
NE
50
10.7
5.5
303
4.2
140
757
0.5
0.4
310
0.2
0.08
5.7
16.5
1.2
Background Threshold Values (Deep Unit)
5.7-6.9
NE
NE
NE
NE
NE
NE
NE
204
204
0.1
1
NE
50
13.1
4.7
665
17.7
183
128
0.5
0.6
127
0.1
0.08
3
7.6
1.9
Background Threshold Values (Bedrock Unit)
5.6-7.6
NE
NE
NE
NE
I NE
NE
NE
1 108
108
0.1
1
NE
50
15
1 4.5
253
18.4
216
300
0.5
0.6
1 435
1 0.2
0.08
3.9
1 8.3
2.8
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
AB-05D
Transition Zone
02/07/2018
5.7
8.48
14
525
0.40
47
252
2.5
SOS
SOS
<0.1
1.4
<2.5
<50
45.9
2.3
3340
140
379
<100
<0.5
0.39
119
<0.1
<0.08
<0.025
<0.5
2.3
AB-05D
Transition Zone
05/10/2018
5.8
7.42
25
349
0.70
500
705
5.9
86.6
86.6
<0.1
1.3
<5.2
<50
57.4
2.4
3870
207
427
70.6j
<0.5
1 S1
106
0.041j
0.083
<0.025
0.26 j,SI
5.4
AB-05D
Transition Zone
08/07/2018
5.7
7.35
23
526
0.24
286
491
1.8
105
105
<0.1
1.4
<2.5
29.3j
50
2.6
3180
154
379
<100
<0.5
1.7
83.1
0.061j
0.031j
<0.025
0.37 j,SI
14.7
AB-05D
Transition Zone
11/06/2018
5.6
9.63
19
368
0.40
85
290
2.4
123
123
<0.1
1.1
<2.5
<50
32
3 M1
2010
67.4
260
<100
<0.5
0.68
79.6
0.053j
<0.08
<0.025
0.42 j,B,SI
7.9
AB-05DU
Saprolite
08/09/2018
5.0
6.28
21
382
0.10
19
224
1.6
111
111
<0.1
1.3
<2.6
33.4 j,B
34.7
3.6
1710
79.5
267
86.7 j
<0.5
0.36 B,SI
284
0.047 j
0.12
<0.025
0.22 j,SI
50.2
AB-05DU
Saprolite
11/06/2018
5.5
9.40
19
354
0.40
67
272
6.0
125
125
<0.1
1.7
19.8
33.8 j
32.2
3.7
1560
59.6
258
318
<0.5
0.23
241
0.04 j
1.3
<0.025
1.3 SI
25.1
AB-05S
Ash Pore Water
02/07/2018
3.3
8.90
12
1879
0.10
419
624
0.0
<5
<5
<0.1
<1
<2.5
2650
187
36.8
1070
969
1650
39500
<0.5
2.9
<5
10.2
0.44
<0.025
8.2
30.6
AB-05S
Ash Pore Water
05/10/2018
3.0
7.30
20
3733
0.48
658
863
0.7
<5
<5
<0.1
<1 M1
<2.5
1850
225
30.8
1380
2680
4330
69900
<0.5
2.5 S1
3.7j
9.6
1.2
<0.25
13.3
59.9
AB-05S
Ash Pore Water
08/07/2018
3.6
7.15
25
4010
0.30
447
652
1.1
<5 MI
<5
<0.1
<1
<2.5
2420
264
41.4
3710
2560
4340
27800
<0.5
4.9
<25
10.6
0.97
<2.5
2.7
86.4
AB-05S
Ash Pore Water
11/06/2018
3.7
7.93
20
3743
0.30
198
403
2.4
<5
<5
<0.1
<1
<2.5
2150
347
40.9
4630
2610
3880
9330
<0.5
3.6
3j
6.3
1.1
<1.2 D3
0.98 B,SI
87.1
AB-06BRA
Bedrock
02/08/2018
12.0
20.84
13
2075
0.40
-89
116
9.7
517
<5
0.75
11.6
8
1210
14
4.1
906
43.8
575
272
0.67
539
69.2
<0.1
<0.08
0.046 SI
1.6 SI
<0.1
AB-06BRA
Bedrock
05/11/2018
11.7
18.20
29
2997
0.40
-176
30
5.8
667
<5
<0.1
12.6
7.7
644 S1
7.54
3.8
1170
93.7
730
608
0.29j
662
102
<0.1
<0.08
<0.025
0.57 S1
0.021j
AB-06BRA
Bedrock
08/13/2018
8.1
18.01
24
595
0.70
-147
58
3.5
193
193
0.31
0.76j
8.8
374
76.9
2.5
3710
109
404
<100
0.099j
420
102
<0.1
<0.08
<0.025
0.28 j,SI
<0.1
AB-06BRA
Bedrock
11/12/2018
10.2
16.85
11
587
0.10
-169
36
7.8
102
82.9
0.48
2.1
<2.5
310
49.6
2.6
2520
Ill
297
104
0.17j
144
51.6
<0.1
<0.08
<0.025
0.22 j,B,SI
0.017j
AB-06BRL
Bedrock
02/08/2018
7.8
21.66
13
823
0.80
-152
54
0.9
88.6
88.6
0.25
<1
<2.6
<50
115
3.9
5720
330
496 D6
<100
<0.5
1.2
41.6
<0.1
<0.08
<0.025
<0.5
<0.1
AB-06BRL
Bedrock
05/11/2018
7.6
19.18
27
772
0.60
-77
128
2.4
101
101
0.11
<1
<2.6
<50
112
2.4
5470
274
600 SI
<100
<0.5
0.68 SI
31.8
<0.1
<0.08
<0.025
0.44 j,SI
<0.1
AB-06BRL
Bedrock
08/13/2018
7.6
19.25
24
729
0.70
-111
94
1.5
83.6
83.6
0.06 j
<1
<2.5
<250
92.2
2.3
6200
281
576
<100
<0.5
0.29
29.1
<0.1
<0.08
0.03
0.3 j,SI
<0.1
AB-06BRL
Bedrock
11/12/2018
7.7
18.29
10
680
0.60
-153
52
3.0
97.4
97.4
0.13
<1
<2.5
<50
112 Ml
2.1
6160 MI
269
527
<100
<0.5
0.25
25.4
0.014j
<0.08
<0.025
0.39 j,B,SI
0.024j
AB-06D
Bedrock
02/08/2018
6.2
18.99
15
508
0.80
-26
179
1.1
222
222
<0.1
1.8
<2.5
6010 M1
76.4
3.5
4590
40
335
<100
<0.5
0.86
68.3
0.63
<0.08
<0.12 D3
<0.5
1.3
AB-06D
Bedrock
05/11/2018
6.0
16.25
29
490
0.30
-9
196
1.8
210
210
<0.1
2
<2.5
5180
68.2
3.3
4060
38.4
322 S1
<100
<0.5
1.4
75.3
0.64
<0.08
<0.025
0.23 j,SI
1.6
AB-06D
Bedrock
08/13/2018
5.9
16.03
25
486
0.30
-100
105
2.4
205
205
<0.1
1.8
15.5
5150
68.4
3.6
3880
41.3
330
<100
<0.5
2
92.7
0.59
<0.08
<0.025
0.18 j,SI
2
AB-06D
Bedrock
11/12/2018
6.1
15.05
9
461
0.40
-3
202
2.8
223
223
<0.1
1.4
<2.5
5210
71
3.7
4030
42.8
311
<100
<0.5
2.3
Ill
0.6
<0.08
<0.025
0.25 j,B,Sl
2.3
AB-06S
Ash Pore Water
02/08/2018
7.5
17.21
14
1364
2.00
-74
131
8.9
284
284
<0.1
<1
18.9
4480
208
3.6
6360
501
1040
1160
<0.5
4140
221
0.11
<0.08
<0.12 D3
0.8 SI
<0.1
AB-06S
Ash Pore Water
05/11/2018
6.3
14.33
28
423
0.10
-34
171
9.1
137
137
<0.1
<1
5.3
514 S1
50.3
0.58j
1970
73
283 S1
219 SI
0.15j
IS70
114
0.23
0.3
<0.025
0.25 j,SI
4.2
AB-06S
Ash Pore Water
08/13/2018
5.8
13.10
29
263
0.30
55
260
2.6
67.4
67.4
<0.1
<1
<2.5
345
31.3
<1
1160
56.3
197
73.4j
0.46j
547
106
0.23
0.24
<0.025
4.9
3.9
AB-06S
Ash Pore Water
11/12/2018
6.0
12.84
9
238
0.20
-79
126
5.2
69
69
<0.1
<1
<5
235
30.6
<1
1060
50.4
194
<100
0.53
549 M1
105
0.22
0.18
<0.025
0.95 S1
4
AB-07D
Transition Zone
02/09/2018
6.3
21.63
13
161
0.60
51
256
6.3
85.8
85.8
<0.1
<1
<2.5
<50 lg
16.5
2
525
<1
129
199
<0.5
1.5
170
<0.1
<0.08
0.93
1.5 SS
0.21
AB-07D
Transition Zone
05/10/2018
6.0
18.90
19
146
0.70
21
226
0.9
75.4
75.4
<0.1
<1
<2.5
<50
13.6
2.2
485
0.93 j
95
89.9 j
0.18 j
0.6 Sl
148
<0.1
<0.08
0.96
1.1 Sl
0.19
AB-07D
Transition Zone
08/08/2018
6.1
19.93
20
139
0.70
116
321
2.6
68.2
68.2
<0.1
<1
<2.5
<50
13.7
2.3
435
0.88 j
118
73.7 j
0.13 j
0.76
129
<0.1
<0.08
1
1.2
0.12
AB-07D
Transition Zone
11/08/2018
6.0
17.85
18
120
1.00
145
350
1.0
65.1
65.1
<0.1
<1
<5
<50
11.1
2.4
425
1.1
112
51 j
0.12 j
0.52
122
0.054 j
<0.08
1.1
1.4 B,SI
0.17
AB-07DU
Saprolite
08/13/2018
5.7
23.26
22
180
0.20
55
260
5.5
87.2
87.2
<0.1
0.58 j
4.4
27.4 j
14.2
2.5
822
3.1
143
50.4 j
0.22 j
0.67
151
0.049 j
<0.08
<0.025
50.7
10.1
AB-07DU
Saprolite
11/08/2018
5.9
17.67
19
207
1.40
-8
198
6.8
109
109
<0.1
0.68 j
6.2
39.4 j
14.5
2.6
814
7.1
149
505
<0.5
2.1
156
0.057 j
<0.08
<0.025
4 51
12.9
AB-07S
Ash Pore Water
02/09/2018
6.5
20.16
7
5869
1.30
55
260
8.5
339
339
<0.1
4.4
11
20500 1g
381
6.7
5640
1480
2570
<100
1
4.6
34.5
<0.1
0.17
<0.12 P4,D3,R0
45.8
5.9
AB-07S
Ash Pore Water
05/10/2018
6.7
17.74
23
2599
0.30
131
336
1.4
217
217
<0.1
0.79j
<2.5
18300
459
2.4
5950
1340
2260
89.6j
7.6
18.4
37
<0.1
0.36
<0.025
0.69 51
2.3
AB-07S
Ash Pore Water
08/08/2018
6.7
18.22
24
2592
0.30
112
317
1.9
228
228
<0.1
<1
<2.5
13200
496
1.7
5930
1380
2440
162
11.9
65.1
42.2
<0.1
0.36
0.25
0.59
1.7
AB-07S
Ash Pore Water
11/08/2018
6.7
16.50
19
2500
0.30
115
320
0.1
264
264
<0.1 R1
0.53j
<2.5
11300
583
1.1
6420
1490
2500
127SI
14.3
81.6
46.2
<0.1
0.72
0.038 S1
0.21 j,B,SI
0.84
AB-08D
Bedrock
02/07/2018
7.8
8.30
9
390
0.40
-124
81
2.1
136
136
<0.1
<1
<2.5
<50
61.4
2.2
2190
66.7
294
<100
<0.5
0.3
53.7
<0.1
<0.08
<0.025
<0.5
0.14
AB-08D
Bedrock
05/10/2018
7.8
8.44
28
395
0.60
-50
155
4.7
130
130
<0.1
<1
<2.5
30.6j
53.7
2.4
2240
75.1
238
60.3j
<0.5
0.3 S3
50.2
<0.1
<0.08
<0.025
0.21 j,SI
0.13
AB-08D
Bedrock
08/08/2018
7.6
7.23
22
399
0.60
-143
62
2.2
127
127
<0.1
<1
<2.5
<50
62.2
2.5
2340
81.6
297
56.7j
<0.5
0.47
52.7
<0.1
<0.08
<0.025
<0.5
0.14
AB-0813
Bedrock
11/07/2018
7.7
6.65
18
394
0.40
-100
105
2.3
135
135
<0.1
<1
<2.5
<50
58.9
2.5
2220
78.9
278
<100
<0.5
0.34 SI
49
<0.1
<0.08
<0.025
0.44 j,B,SI
0.14SI
AB-08DU
Saprolite
08/09/2018
5.7
7.12
19
296
0.10
27
232
1.3
73
73
<0.1
0.63j
3.5
105
26.8
4.1
1220
68.3
215
129
0.23j
0.2 Sl
201
0.059j
<0.08
0.18
3.8
2.8
AB-08131.1
Saprolite
11/07/2018
5.9
6.41
20
260
0.80
-3
202
5.4
83.5
83.5
0.057 j
0.55 j
<5
45.3 j
22
3.8 M1
1030
54.1
197
97.4 j
0.14 j
0.74 S1
172
0.067 j
<0.08
<0.025
0.85 SS
5.3
AB-08S
Ash Pore Water
02/07/2018
5.9
8.55
10
584
0.40
27
232
5.9
89.7
89.7
<0.1
<1
<2.5
1180
51.3
4.2
1610
176
445
<100
<0.5
36.1
43.3
<0.1
<0.08
<0.025
<0.5
16.3
AB-08S
Ash Pore Water
05/10/2018
6.1
8.90
23
245
0.20
-41
164
7.8
40.3 M1
40.3
<0.1
<1
<2.6
405
15.1
1.8
720
63.6
157
64.4 j
<0.5
76.5
55.2
0.037 j
<0.08
<0.025
0.17 j,SI
6.2
AB-08S
Ash Pore Water
08/08/2018
5.8
7.13
28
353
0.30
5
210
7.3
55.6
55.6
<0.1
0.55 j
<2.5
843
29.5
2.4
1140
113
267
65.9 j
0.092 j
58.5
48.8
0.095 j
<0.08
<0.025
0.41 j,B
11.4
AB-08S
Ash Pore Water
11/07/2018
5.9
6.60
22
514
0.40
-58
147
6.4
70.9
70.9
<0.1
0.6 j
<2.5
1280
44.6
3.8
1650
165
387
58.1 j
0.11 j
55.5
57.3
0.091 j
<0.08
<0.025
0.33 j,B,Sl
20.6
AB-09BR
Bedrock
02/09/2018
7.1
7.12
17
262
0.60
-131
75
0.5
134
134
<0.1
<1
<2.5
<50
28.2
1.2
260
15.2
198
<100
<0.5
0.69
196
<0.1
<0.08
<0.025
<0.5
0.14
AB-09BR
Bedrock
05/10/2018
7.0
7.04
25
271
0.40
-92
113
3.1
118
118
<0.1
<1
<2.5
<50
29.4
1.3
251
15.8
179
<100
<0.5
0.56 Sl
196
<0.1
<0.08
0.29 SI
0.37 j,SI
0.15
AB-09BR
Bedrock
08/09/2018
7.0
7.78
25
265
0.10
-111
94
1.4
118
118
<0.1
<1
<2.5
<50
29.8
1.5
249
16.1
189
<100
<0.5
0.6
192
<0.1
<0.08
<0.025
0.25 j,SI
0.14
AB-09BR
Bedrock
11/07/2018
7.1
6.58
17
264
0.50
-104
101
1.4
130
130
<0.1
<1
<2.5
<50
30.4 M1
1.4
255
16
180
<100
<0.5
0.59 S1
195
0.061j
<0.08
<0.025
0.35 j,B,SI
0.14SI
AB-09D
Bedrock
02/09/2018
6.7
7.35
13
193
0.40
-32
173
0.5
97.9
97.9
<0.1
<1
<2.5
<50
10.3
1.6
236
7.5
140
<100
<0.5
0.46
262
<0.1
<0.08
<0.025
<0.5
2.5
AB-09D
Bedrock
05/14/2018
6.5
7.25
22
202
0.50
15
1 220
2.4
93.2
93.2
<0.1
<1
<2.6
<50
11.2
1.7
215
7.6
141
<100
<0.5
0.4
250
<0.1
<0.08
<0.025
1.1 B.S3
2.1
Page 4 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
Copper
Iron
Lead
Lithium
Magnesium
Manganese
Mercury
Molybdenum
Nickel
Nitrate
+ Nitrite
Potassium
Selenium
Sodium
Thallium
Vanadium
Zinc
Aluminum
(0.45u)
Antimony
(0.45u)
Arsenic
(0.45u)
Barium
(0.45u)
Beryllium
(0.45u)
Boron
(0.45u)
Cadmium
(0.45u)
Chromium
(0.45u)
Cobalt
(0.45u)
Copper
(0.45u)
Iron
(0.45u)
Reporting Units
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
mg-N/L
mg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
1000
300
15
NE
NE
50
1
NE
100
NE
NE
20
NE
0.2*
0.3*
1000
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Shallow Unit)
3.8
744
0.3
NE
1.8
75.3
0.2
0.5
9.9
2.7
5
0.5
9.1
0.1
5.6
19.2
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Deep Unit)
2.8
272
0.1
NE
14.4
141
0.2
3.2
7.5
1.4
7.8
0.5
29.2
0.1
3.8
17
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Bedrock Unit)
4.2
792
0.2
NE
13.2
26.6
1 0.2
3
7.2
0.4
1 9.8
1 0.5
14
1 0.1
16
1 11.9
1 NE
NE
NE
NE
NE
NE
NE
NE
I NE
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
AB-05D
Transition Zone
02/07/2018
1.2 SI
245
<0.1
13.1
19.4
470
<0.2
<0.5
11.2
<0.02
6.8
<0.5
20.5
<0.1
0.93
10.1
<100
<0.5
0.49
103
<0.1
<50
<0.08
<0.5
2.9
1.8 S1
304
AB-05D
Transition Zone
05/10/2018
1 sl
1250
0.062 j
15.4
24.6
829
<0.2
0.35 j,Sl
13.4
<0.02
7.2
0.36 j
20.6
0.033 j
0.93
15.7
<100
<0.5
1.5
91.2
0.057 j
<50
0.057 j
0.22 j
6
1.9 Sl
1080
AB-051)
Transition Zone
08/07/2018
0.52 B
1700
0.056 j
14.9
21.5
1620
<0.2
0.44 j
14.5
<0.02
7.92
0.19 j
24.5
<0.1
0.58 S3
17.5 B,Sl
<100
<0.5
1.4
69.3
<0.1
<50
<0.08
0.16 j
12.9
0.65 S1
1040
AB-05D
Transition Zone
11/06/2018
0.19 j,Sl
531
<0.1
15.5
14.6
891
<0.2
0.3 j
8.8
<0.02
6.16
<0.5
18.4
<0.1
0.48 S3
14.5
<100
<0.5
0.49
70.9
0.056 j
<50
<0.08
0.24 j,B,SI
7.6
1.6
399
AB-05DU
Saprolite
08/09/2018
0.16 j
1040
<0.1
8.4
13.6
4290
<0.2
0.16 j
12.4
<0.02
4.02 j
<0.5
17
<0.1
1.2
6.9 j,B,SI
<100
<0.5
0.4 Sl
276
0.049 j,Sl
<50
0.11
<0.5
52
0.34 j,Sl
938
AB-05DU
Saprolite
11/06/2018
0.76 S3
1240
0.18
10.8
13.4
2920
<0.2
0.15 j
11.9
0.012 j
4.18 j
<0.5
17
<0.1
2.7
7.8 j
<100
<0.5
0.16
230
0.036 j
27.2 j
0.21
0.41 j,B,SI
27.6
0.46 j,Sl
1080
AB-05S
Ash Pore Water
02/07/2018
50.8
81000
0.19
169
29.4
3260
<0.2
<0.5
74.6
0.14
9.42
1.1
12.9
0.82
1
159
36000
<0.5
4.4
5.1
10.1
2460
0.37
12.8
33.1
40.2
85400
AB-05S
Ash Pore Water
05/10/2018
51.6
830000
0.15
256
50.7
8600
<0.2
<0.5
130
<0.02 M1
5.11
1.5
13
0.8
18.2
433
71600
<0.5
2.5
3.2j
9.4
2180
1.2
12.5
60.1
49.8
733000 M6
AB-05S
Ash Pore Water
08/07/2018
13.4
665000
1.1
421
58.4
8570
<0.2
<0.5
182
0.013 j,M1
24.1j
2.8
16.2j
2.7
19.6
644
23100
0.079j
4.7
<5
10.8
1840
1
3.2
85.6
15.3
656000
AB-05S
Ash Pore Water
11/06/2018
6.4
822000
0.11
357
65.6
9730
<0.2
<0.5
161
<0.02
26.4
0.96
14
2.2
9
451
13200
<0.5
3.2
5.7
9.6 Ml
2180
1.6
1.8
85
14.1
539000
AB-06BRA
Bedrock
02/08/2018
<0.5
132
<0.1
467
0.56
13.8
<0.2
66.7
0.8 Sl
<0.02
125
<0.5
176
<0.1
1.9
<10
230
0.64
519
53.5
<0.1
1090
<0.08
<0.5
<0.1
<0.5
<50
AB-06BRA
Bedrock
05/11/2018
<0.5
36.8 j
<0.1
748
0.287 Sl
10.6
<0.2
41.3
0.86
<0.02
187
0.74
209
<0.1
4.1
<10
340
0.22 j
600
87.4
<0.1
514
<0.08
0.22 j,Sl
<0.1
<0.5
<50
AB-06BRA
Bedrock
08/13/2018
<0.5
112
<0.1
28.9
4.7
98.1
<0.2
7.3
<0.5
<0.02
24
0.16 j
28.3
<0.1
<0.3
<10
<100
<0.5
346
94.6
<0.1
305
<0.08
<0.5
<0.1
<0.5
69.1
AB-06BRA
Bedrock
11/12/2018
0.12 j,Sl
241
<0.1
118
2.33
52.5
<0.2
6
<0.5
<0.02
50.4
<0.5
51.9
<0.1
0.2 j
<10
81 j
0.12 j
124
47.7
<0.1
248
<0.08
<0.5
0.014 j
<0.5 BC
198 Sl
AB-06BRL
Bedrock
02/08/2018
<0.5
286
<0.1
3.2
6.66
68.4
<0.2
7.2
4
<0.02
6.53
<0.5
54.1
<0.1
<0.3
<10
<100
<0.5
1.1
39.3
<0.1
<50
<0.08
<0.5
<0.1
<0.5
226
AB-06BRL
Bedrock
05/11/2018
<0.5
240
<0.1
4
5.55
57.8
<0.2
5.6
0.38 j
<0.02
5.31
<0.5
40.6
<0.1
0.13 j,Sl
<10
<100
<0.5
0.46
30
<0.1
65.9
<0.08
0.26 j,Sl
<0.1
1.1 Sl
269
AB-06BRL
Bedrock
08/13/2018
0.26 j,B,SI
293
<0.1
2.5 B
6.81
64.4
<0.2
4.5
1.1 sl
<0.02
5.16
<0.5
23.7
<0.1
0.091 j,B,SI
<10
<100
<0.5
0.32
27
<0.1
<50
<0.08
0.2 j
<0.1
0.18 j,B
270
AB-06BRL
Bedrock
11/12/2018
0.27 j,Sl
260
<0.1
2.1 j,Sl
6.56
58.8
<0.2
4
<0.5
<0.02
4.92 j
<0.5
21.3 M1
<0.1
<0.3
<10
<100
<0.5
0.22
25.4
0.015 j
<50
<0.08
<0.5
0.02 j
0.25 j,BC,SI
259 Sl
AB-06D
Bedrock
02/08/2018
<0.5
6320
<0.1
16.4
8.21
383
<0.2
<0.5
39.9
<0.02
6.46
<0.5
9.9
<0.1
<0.3
<10
<100
<0.5
1.8
107
0.66
5180
<0.08
<0.5
2
<0.5
4810
AB-06D
Bedrock
05/11/2018
<0.5
5440
<0.1
17
8.63
387
<0.2
0.42 j,Sl
48.5
0.014 j
6.72
<0.5
10
<0.1
0.22 j,Sl
<10
<100
<0.5
2
100
0.65
4590
<0.08
<0.5
2.2
<0.5
4410
AB-06D
Bedrock
08/13/2018
<0.5
5480
<0.1
14.7
8.57
452
<0.2
0.47 j
54.5
0.032
6.47
<0.5
9.3
<0.1
0.3 B,Sl
4 j
<100
<0.5
2.2
111
0.63
4840
<0.08
0.27 j
2.2
<0.5
4700
AB-06D
Bedrock
11/12/2018
0.22 j,Sl
5040
<0.1
12.7
9.28
542
<0.2
0.55
56.7
<0.02
7.07
<0.5
9.48
<0.1
0.15 j
<10
<100
<0.5
2
133
0.57
4740
<0.08
0.36 j
2.4
0.32 j,BC,SI
4450
AB-06S
Ash Pore Water
02/08/2018
0.82 SI
3330
0.14 sl
660
49
1560
<0.2
39.3
6.4
<0.02
35
<0.5
14.3
<0.1
2
<10
126
<0.5
3870
170
<0.1
3790
<0.08
<0.5
<0.1
<0.5
2220
AB-06S
Ash Pore Water
05/11/2018
1.5
8720
<0.1
132
9.85
961
<0.2
7.1
11.1
0.017 j
12.9
0.34 j
3.27 j
1
1.5
15.4
112
0.13 j
1370
89.6
0.16
468
0.26
0.25 j,Sl
4.4
<0.5
7020
AB-06S
Ash Pore Water
08/13/2018
2.5
4000
<0.1
87.7
4.46
398
<0.2
3.1
14.6
0.024
10.3
2.5
2.09 j
2.8
2.5
16.4
<100
0.45 j
525
101
0.25
308
0.21
2.3
3.9
1.9
3470
AB-065
Ash Pore Water
11/12/2018
2
5360
<0.1
72.8
3.65
441
<0.2
3.4
12.4
<0.02
10.4
3.7
1.79 j
2.8
2.2
12.2
52.4 j
0.46 j
516
96.6
0.18
202
0.16
0.75
3.9
1.5 Sl
4940
AB-07D
Transition Zone
02/09/2018
0.7 Sl
279 SI
<0.1
13.1
1.91
25.4
<0.2
<0.5
14.5
0.044
<5
75
12
<0.1
7.7
<10
<100
<0.5
1.1
167
<0.1
<50
<0.08
1.4 sl
0.17
0.63 S1
<50
AB-07D
Transition Zone
05/10/2018
0.4 j,Sl
122 S3
0.032 j
10.5
2.03
25
<0.2
0.19 j,Sl
1.1
0.036
2.5 j
0.18 j
11.5
<0.1
6
<10
<100
0.21 j
0.62
132
0.037 j
<50
<0.08
1.1
0.21
0.56 SI
<50
AB-07D
Transition Zone
08/08/2018
0.42 j,Sl
78.3
<0.1
10.2
1.87
19.9
<0.2
0.19 j
4
0.041
2.56 j
0.18 j
11.8
<0.1
6.6
3.7 j,B
<100
0.13 j
0.7
120
<0.1
<50
<0.08
1 sl
0.11
0.79 B,Sl
<50
AB-07D
Transition Zone
11/08/2018
0.49 j,Sl
37.9 j
0.12
7.8
1.94
13.8
<0.2
0.56
1.2
0.043
<5
<0.5
12.2
0.047 j
6.6
3.6 j,B
<100
<0.5
0.38
105
0.029 j
<50
<0.08
1.1 sl
0.12
0.68 Sl
<50
AB-07DU
Saprolite
08/13/2018
1.6
1980
<0.1
2.7
4.85
551
<0.2
1.5
28.2
0.012 j
<5
0.21 j
13.8
<0.1
2 D3
5.7 j,B
<100
0.12 j
0.53
134
0.04 j
<50
<0.08
20.7
9.7
0.37 j,B
1380
AB-07DU
Saprolite
11/08/2018
0.9 sl
6230
0.26
2.1 j
5.27
560
<0.2
0.6
7
<0.02
<5
<0.5
18.6
<0.1
2.5
258
<100
<0.5
1.8
139
0.04 j
33.3 j
<0.08
0.25 j,Sl
12.7
0.34 j,Sl
5170
AB-07S
Ash Pore Water
02/09/2018
4.9 Sl
4080
<0.1
559
172
6440
<0.2
326
31.2
0.17
32.1
6.7
54.8
0.72
<0.3
<10
208
1.2
9.8
36
0.16
16700
<0.08
9.2
8.3
3.2
16700
AB-07S
Ash Pore Water
05/10/2018
1 sl
268 S3
0.036 j
1780
71
2060
<0.2
2130
8.9
4.8
86
31.4
31.6
3.3
12.3
5.9 j
52.2 j
12.4
47.8
34.4
0.042 j
15500
0.29
0.57
1.7
1.2 Sl
34.2 j
AB-07S
Ash Pore Water
08/08/2018
0.34 j,Sl
29.4 j
<0.1
1680
46.1
2280
<0.2
2360
19.6
8.4
84.5
98.7
24.2
5.2
75.1
4.9 j,B
171 Sl
12.7
75.1
37.8
<0.1
11800
0.37
0.51 sl
1.4
0.61 B,Sl
<50
AB-07S
Ash Pore Water
11/08/2018
0.54 Sl
<50
<0.1
787
28.1
2130
<0.2
1960
46.5
0.71 Sl
75.8
119
13.9
6.3
111
5.4 j,B
64.2 j
15.9
64.7
37.7
<0.1
10500
0.63
0.26 j,Sl
0.67
0.51 SI
<50
AB-08D
Bedrock
02/07/2018
<0.5
78
<0.1
9
7.01
345
<0.2
2
<0.5
<0.02
<5
<0.5
11.4
<0.1
<0.3
<10
<100
<0.5
0.36
47.9
<0.1
<50
<0.08
<0.5
0.13
<0.5
<50
AB-0813
Bedrock
05/10/2018
<0.5
114 S3
<0.1
6.3
6.41
306
<0.2
2
0.32 j
<0.02
4.46 j
<0.5
10.3
<0.1
0.11 j,Sl
<10
<100
<0.5
0.33
48.2
<0.1
27.7 j
<0.08
1.1
0.13
<0.5
47.1 j
AB-08D
Bedrock
08/08/2018
0.43 j,Sl
70.1 sl
0.058 j
6.9
7.19
346
<0.2
2.1
0.19 j
<0.02
4.95 j
<0.5
12.5
<0.1
<0.3
3.8 j,B
55.2 j,Sl
<0.5
0.3 Sl
45.9
<0.1
<50
<0.08
0.18 j,Sl
0.12
<0.5
50.4
AB-0813
Bedrock
11/07/2018
0.33 j,Sl
94.6
<0.1
5.8
6.65
318
<0.2
2.1
0.64
<0.02
4.61 j
<0.5
11.9
<0.1
0.16 j
3.5 j
<100
<0.5
0.34
43.5
<0.1
<50
<0.08
0.11 j,B,SI
0.12
<0.5 BC
54
AB-08DU
Saprolite
08/09/2018
0.19 j
333
0.12
3.9
10.1
550
<0.2
0.77
10.3
<0.02
2.86 j
0.25 j
14.5
<0.1
0.39
5.6 j,Sl
<100
0.16 j
0.19 sl
191
<0.1
50.4
<0.08
1 sl
2.6
0.18 j,Sl
121
AB-08DU
Saprolite
11/07/2018
1.1 sl
3150
0.13
3.3
8.4
849
<0.2
0.7 Sl
12
<0.02
2.77 j
<0.5
16.1
<0.1
0.45
6.4 j
<100
<0.5
0.61
154
0.05 j
43 j
<0.08
0.51 B,Sl
4.8
<0.5 BC
2570
AB-08S
Ash Pore Water
02/07/2018
<0.5
16900
<0.1
41.3
28.4
1520
<0.2
3.2
18.2
0.053
8.22
<0.5
16.4
0.69
0.52
19.4
<100
<0.5
38.2
41.6
<0.1
1200
<0.08
<0.5
16.5
<0.5
19200
AB-08S
Ash Pore Water
05/10/2018
<0.5
14700
<0.1
29.1
6.93
475
<0.2
2.8
5.7
0.024
5.71
<0.5
4.32 j
0.39
0.18 j,SI
7.3 j
<100
<0.5
79.9
49.9
0.042 j
376
<0.08
<0.5
6.3
<0.5
13500
AB-08S
Ash Pore Water
08/08/2018
1 sl
15600
0.071 j
46
12.9
975
<0.2
3
13.4
0.032
7.95
0.41
8.06
0.93
0.32
17.4 B
69.3 j,Sl
<0.5
55.8
42.3
<0.1
741
<0.08
<0.5
10.8
0.39 j,Sl
13400
AB-08S
Ash Pore Water
11/07/2018
0.76 S3
20700
<0.1
60.4
17
1400
<0.2
3.4
25.8
<0.02
11
1.1
9.48
1.1
0.56
26.8
<100
<0.5
39.4
49.2
0.098 j
1160
<0.08
0.24 j,B,SI
21.1
<0.5 BC
18600
AB-09BR
Bedrock
02/09/2018
<0.5
742
<0.1
26.9
7.08
96.2
<0.2
4.4
1.5 sl
<0.02
<5
<0.5
11.1
<0.1
<0.3
<10
<100
<0.5
0.67
195
<0.1
<50
<0.08
<0.5
0.14
<0.5
702
AB-09BR
Bedrock
05/10/2018
<0.5
699
<0.1
23.9
7.37
102
<0.2
4.8
1.8
<0.02
5.17
<0.5
11.5
<0.1
<0.3
<10
<100
<0.5
0.6
187
<0.1
<50
<0.08
<0.5
0.16
<0.5
679
AB-09BR
Bedrock
08/09/2018
0.15 j
729
<0.1
26.2
7.47
92.3
<0.2
4.7
1.3
0.018 j
5.24
<0.5
11.7
<0.1
<0.3
3.5 j,Sl
<100
<0.5
0.54 SI
180
0.045 j,Sl
<50
<0.08
<0.5
0.12 Sl
1.7 Sl
572
AB-09BR
Bedrock
11/07/2018
<0.5
695
0.098 j
22.5
7.51
89.9
<0.2
5.1
1.8
<0.02
5.51
<0.5
11.8
0.028 j
0.22 j
3.6 j
<100
<0.5
0.55
166
0.019 j
<50
<0.08
0.15 j,B,SI
0.13
<0.5 BC
544
AB-09D
Bedrock
02/09/2018
<0.5
1030
<0.1
1 16.6
10
56.2
<0.2
2.4
22.1
<0.02
7.35
<0.5
8.24
<0.1
<0.3
<10
<100
<0.5
0.47
1 266
<0.1
<50
<0.08
<0.5
2.7
<0.5
1 900
AB-09D
Bedrock
05/14/2018
0.42 j,Sl
1080
<0.1
1 15
11
48.6
<0.2
2.5
22
<0.02
7.78
<0.5
8.54
<0.1
<0.3
<10
<100
<0.5
0.4
1 254
<0.1
<50
1 <0.08
<0.5
2.8
<0.5
1 910
Page 5 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
RADIONUCLIDES
OTHER PARAMETERS
Lead
(0.45u)
Manganese
(0.45u)
Mercury
(0.45u)
Molybdenum
(0.45u)
Nickel
(0.45u)
Phosphorus
(0.45u)
Selenium
(0.45u)
Silver
(0.45u)
Strontium
(0.45u)
Thallium
(0.45u)
Vanadium
(0.45u)
Zinc
(0.45u)
Radium-226
Radium-228
Total
Radium
Uranium-238
Total
Uranium
Uranium-238
DIS
Carbonate
Alkalinity
Fluoride
Phosphorus
Reporting Units
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pCi/L
pCi/L
pCi/L
ug/mL
ug/mL
ug/mL
mg/L
mg/L
mg/L
15A NCAC 02L Standard
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5A
NE
0.03A
NE
NE
2
NE
Background Threshold Values (Shallow Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
3
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Deep Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
2.8
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Bedrock Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5.7
NE
0.0005
NE
5
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
AB-05D
Transition Zone
02/07/2018
<0.1
473
<0.2
<0.5
11.7
<0.05
<0.5
NA
3050
<0.1
0.91
<10
0.473
1.24 B,S1
1.713
<0.0005
<0.0005
NA
<5
<0.1
<0.05
AB-05D
Transition Zone
05/10/2018
<0.1
726
<0.2
0.21j
14.3
<0.05
0.32j
NA
3700
0.038j
0.91
16
0.39 U
1.33
1.72
0.00011j
0.00011j
0.000097j
<5
0.094j
0.0353
AB-051)
Transition Zone
08/07/2018
<0.1
1250
<0.2
0.33j
13
<0.05
0.19j
NA
2570
<0.1
0.35
14.4
1.81
1.09
2.9
<0.0005
<0.0005
<0.0005
<5
0.1
0.06
AB-05D
Transition Zone
11/06/2018
<0.1
778
<0.2
0.31 j
8.9
0.036 j
<0.5
NA
1780
0.02 j
0.29 j
27.6
0.321 U
-0.0924 U
0.321 U
NA
0.0001 j
NA
<5
0.12 M1
0.04 j
AB-05DU
Saprolite
08/09/2018
<0.1
3810
<0.2
0.18 j
13.3
0.11
<0.5
NA
1610
<0.1
1.2
5 j
0.818
0.513 U
1.33 U
<0.0005
<0.0005
<0.0005
<5
0.1
0.12
AB-05DU
Saprolite
11/06/2018
<0.1
2880
<0.2
0.13 j
11.8
0.11
<0.5
NA
1440
<0.1
1.2
6.3 j
0.429 U
0.32 U
0.749 U
NA
<0.0005
NA
<5
0.13
0.13
AB-05S
Ash Pore Water
02/07/2018
<0.1
3240
<0.2
<0.5
76.3
<0.05
5.7
NA
1070
0.66
2.6
154
0.0516
1.09
<0.0005
<0.0005
NA
<5
0.82
<0.05
AB-05S
Ash Pore Water
05/10/2018
0.14
8720
<0.2
<0.5
133
<0.05
1.4
NA
1220
0.82
17.9
446
-0.113 U
0.524 U
0.0018
0.0018
0.0017
<5
0.25
0.038j
AB-05S
Ash Pore Water
08/07/2018
0.71
5820
<0.2
<0.5
187
<0.05
2.6
NA
2390
3
22.5
460
0.537
0.412 U
E0.364
0.00079
0.00079
0.00089
<5
1.4
<0.05
AB-05S
Ash Pore Water
11/06/2018
0.093j
7160
<0.2
<0.5
173
0.04j
1.1
NA
3840
4
17.8
467
0.364 U
-0.118 U
NA
0.00027j
NA
<5
0.46
0.042j
AB-06BRA
Bedrock
02/08/2018
<0.1
<5
<0.2
62.8
0.78
0.12
<0.5
NA
843
<0.1
2.3
<10
NA
NA
NA
NA
NA
448
0.96
0.63
AB-06BRA
Bedrock
05/11/2018
<0.1
<5
<0.2
37
0.69 SI
<0.05
0.6
NA
1350
<0.1
3.6
<10
NA
NA
NA
NA
NA
NA
516
1.4
0.17
AB-06BRA
Bedrock
08/13/2018
<0.1
102
<0.2
6.2
<0.5
0.28
<0.5
NA
3520
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
1.9
0.31
AB-06BRA
Bedrock
11/12/2018
<0.1
40.6
<0.2
5.3
<0.5
0.1
<0.5
NA
2320
<0.1
0.1 j
<10
NA
NA
NA
NA
NA
NA
18.8
2.5
0.13
AB-06BRL
Bedrock
02/08/2018
<0.1
65.6
<0.2
7.6
2.2
<0.05
<0.5
NA
5400
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
2.4
<0.05
AB-06BRL
Bedrock
05/11/2018
<0.1
59.4
<0.2
4.3
0.21 j,S1
<0.05
<0.5
NA
5560
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
2.6
<0.05
AB-06BRL
Bedrock
08/13/2018
<0.1
61.6
<0.2
4.3
0.49 j
<0.05
<0.5
NA
5820
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
2.6
0.025 j
AB-06BRL
Bedrock
11/12/2018
<0.1
56.4
<0.2
3.6
<0.5
<0.05
<0.5
NA
5570 M1
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
2.7
<0.05
AB-06D
Bedrock
02/08/2018
<0.1
499
<0.2
0.51
51.1
0.054
<0.5
NA
3650
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.25
<0.05
AB-06D
Bedrock
05/11/2018
<0.1
450
<0.2
0.55
56.2
<0.05
<0.5
NA
3390
<0.1
0.26 j,S1
<10
NA
NA
NA
NA
NA
NA
<5
0.26
<0.05
AB-06D
Bedrock
08/13/2018
0.061j
465
<0.2
0.49j
54.8
0.027j
<0.5
NA
3390
<0.1
0.18j
<10
NA
NA
NA
NA
NA
NA
<5
0.26
0.069
AB-06D
Bedrock
11/12/2018
<0.1
521
<0.2
0.52 B
59.1
0.05
<0.5
NA
3370
<0.1
0.13j
<10
NA
NA
NA
NA
NA
NA
<5
0.28
0.042j
AB-06S
Ash Pore Water
02/08/2018
<0.1
1440
<0.2
42.2
7
1
<0.5
NA
5580
<0.1
0.31
<10
NA
NA
NA
NA
NA
NA
<5
2.4
1.3
AB-06S
Ash Pore Water
05/11/2018
<0.1
829
<0.2
7.3
11.4
0.22
0.24 j
NA
1690
0.96
1.1
13.2
NA
NA
NA
NA
NA
NA
<5
0.81
0.42 M1
AB-06S
Ash Pore Water
08/13/2018
<0.1
359
<0.2
3.1
14.2
0.17
2.5
NA
1050
2.8
2.4
11.3
NA
NA
NA
NA
NA
NA
<5
0.27
0.21
AB-06S
Ash Pore Water
11/12/2018
<0.1
416
<0.2
3.3
12.2
0.2
3.7
NA
996
2.6
1.6
8.9 j
NA
NA
NA
NA
NA
NA
<5
0.23
0.21
AB-07D
Transition Zone
02/09/2018
<0.1
22.8
<0.2
<0.5
11
0.19 R1
<0.5
NA
524
<0.1
7.3
<10
NA
NA
NA
NA
NA
NA
<5
0.14
0.2
AB-07D
Transition Zone
05/10/2018
<0.1
25.9
<0.2
0.21 j
2 S3
0.16
0.17 j
NA
441
<0.1
6.2
<10
NA
NA
NA
NA
NA
NA
<5
0.15
0.18
AB-07D
Transition Zone
08/08/2018
<0.1
16.8
<0.2
0.2 j,S1
6.9
0.23
0.19 j,S1
NA
406
<0.1
6.7
3.6 j,B
NA
NA
NA
NA
NA
NA
<5
0.15
0.23
AB-07D
Transition Zone
11/08/2018
<0.1
11.9
<0.2
0.16 j
1.5
0.19
<0.5
NA
376
<0.1
6
<10
NA
NA
NA
NA
NA
NA
<5
0.16
0.2
AB-07DU
Saprolite
08/13/2018
<0.1
514
<0.2
0.58 B
12.3
0.064
0.23 j
NA
726
<0.1
<0.3
3.5 j
0.57 U
0.825 U
1.4 U
<0.0005
<0.0005
<0.0005
<5
0.1
0.067
AB-07DU
Saprolite
11/08/2018
<0.1
539
<0.2
0.47 j
5.4
0.092
<0.5
NA
762
<0.1
0.32
270
0.555 U
0.286 U
0.841 U
NA
0.000072 j
NA
<5
0.11
0.13
AB-07S
Ash Pore Water
02/09/2018
0.12
6600
<0.2
351
37.6
<0.05
7.4
NA
4950
0.68
4.2
12.9
NA
NA
NA
NA
NA
NA
<5
0.8
<0.05
AB-07S
Ash Pore Water
05/10/2018
<0.1
1540
<0.2
2480
10
0.075
69.8
NA
5370
3.6
31.4
6.1j
NA
NA
NA
NA
NA
NA
<5
0.42
0.026j
AB-07S
Ash Pore Water
08/08/2018
<0.1
1680
<0.2
2220
20.2
0.19
103
NA
5320
5.1
91.4
6.2 j,B
NA
NA
NA
NA
NA
NA
<5
0.26
0.18
AB-07S
Ash Pore Water
11/08/2018
<0.1
1440
<0.2
1800
48.3
0.2
127
NA
5860
5.3
102
3.3j
NA
NA
NA
NA
NA
NA
<5
0.24
0.23
AB-08D
Bedrock
02/07/2018
<0.1
327
<0.2
1.7
<0.5
<0.05
<0.5
NA
2270
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
1.1
<0.05
AB-0813
Bedrock
05/10/2018
0.2
319
<0.2
1.9
0.69 S3
<0.05
<0.5
NA
2110
<0.1
0.13 j
<10
NA
NA
NA
NA
NA
NA
<5
1.3
<0.05
AB-08D
Bedrock
08/08/2018
<0.1
312
<0.2
1.8
0. 14 j,S1
0.048j
<0.5
NA
2130
<0.1
0.058j
<10
NA
NA
NA
NA
NA
NA
<5
1.3
<0.05
AB-0813
Bedrock
11/07/2018
<0.1
301
<0.2
1.9
0.65
<0.05
<0.5
NA
2060
<0.1
0.13 j,B,SI
<10
NA
NA
NA
NA
NA
NA
<5
1.2
<0.05
AB-08DU
Saprolite
08/09/2018
<0.1
496
<0.2
0.59
8.7
0.083
0.21 j
NA
1140
<0.1
0.41 SI
3.1 j
-0.068 U
0.381 U
0.381 U
<0.0005
<0.0005
<0.0005
<5
<0.1
0.084
AB-08DU
Saprolite
11/07/2018
<0.1
749
<0.2
0.54
12.6
0.064
<0.5
NA
968
<0.1
0.26 j,B,SI
2.6 j,S1
0.632 U
0.978 U
1.61 U
NA
<0.0005
NA
<5
0.13 M1
0.072
AB-08S
Ash Pore Water
02/07/2018
<0.1
1590
<0.2
3.2
18.8
<0.05
0.51
NA
1800
0.69
0.44
19.4
NA
NA
NA
NA
NA
NA
<5
0.18
<0.05
AB-08S
Ash Pore Water
05/10/2018
<0.1
453
<0.2
2.7
6
<0.05
<0.5
NA
648
0.39
0.16 j
9.9 j
NA
NA
NA
NA
NA
NA
<5
0.18
<0.05
AB-08S
Ash Pore Water
08/08/2018
<0.1
853
<0.2
2.8
12.4
<0.05
0.15 j,S1
NA
959
0.86
0.2 j
14.1 B
NA
NA
NA
NA
NA
NA
<5
0.2
<0.05
AB-08S
Ash Pore Water
11/07/2018
<0.1
1310
<0.2
3
27
<0.05
0.91
NA
1520
1.2
0.5 B,S1
25.4 S1
NA
NA
NA
NA
NA
NA
<5
0.2
<0.05
AB-09BR
Bedrock
02/09/2018
<0.1
93.3
<0.2
5.4
1.5 SS
<0.05
<0.5
NA
256
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.43
<0.05
AB-09BR
Bedrock
05/10/2018
<0.1
90.6
<0.2
5.1
1.9 51
<0.05
<0.5
NA
235
<0.1
0.15 j,B
<10
NA
NA
NA
NA
NA
NA
<5
0.42
<0.05
AB-09BR
Bedrock
08/09/2018
<0.1
75.5
<0.2
4.7
1.2 SI
<0.05
<0.5
NA
233
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.42
<0.05
AB-09BR
Bedrock
11/07/2018
<0.1
73.8
<0.2
5.3
1.9
<0.05
<0.5
NA
227
<0.1
0.23 j,B,SI
<10
NA
NA
NA
NA
NA
NA
<5
0.43
<0.05
AB-09D
Bedrock
02/09/2018
<0.1
56.2
<0.2
2.6
22.6
<0.05
<0.5
NA
229
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.37
<0.05
AB-09D
Bedrock
05/14/2018
<0.1
50.2
<0.2
2.4
22.1
<0.05
<0.5
NA
222
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.32 S1
0.03 j
Page 6 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
FIELD PARAMETERS
WATER QUALITY PARAMETERS
SELECTED 40CFR257 APPENDIX III CONSTITUENTS plus Sr
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
PH
Water
Level
Temp
Spec
Cond
DO
ORP
Eh
Turbidity
Alkalinity
Bi-
carbonate
Alkalinity
Sulfide
Total
Organic
Carbon
Total
Suspended
Solids
Boron
Calcium
Chloride
Strontium
Sulfate
Total
Dissolved
Solids
Aluminum
Antimony
Arsenic
Barium
Beryllium
Cadmium
Chromium
(VI)
Chromium
Cobalt
Reporting Units
S.U.
ft
Deg C
pmhos/cm
mg/L
mV
mV
NTUs
mg/L
mg/L
mg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
6.5-8.5
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
700
NE
250
NE
250
Soo
NE
1*
10
700
4*
2
10
10
1*
Background Threshold Values (Shallow Unit)
4.6-6.4
NE
NE
NE
NE
NE
NE
NE
63
63
0.1
1
NE
50
10.7
5.5
303
4.2
140
757
0.5
0.4
310
0.2
0.08
5.7
16.5
1.2
Background Threshold Values (Deep Unit)
5.7-6.9
NE
NE
NE
NE
NE
NE
NE
204
204
0.1
1
NE
50
13.1
4.7
665
17.7
183
128
0.5
0.6
127
0.1
0.08
3
7.6
1.9
Background Threshold Values (Bedrock Unit)
5.6-7.6
NE
NE
NE
NE
NE
I NE
NE
108
108
1 0.1
1 1
NE
50
15
1 4.5
1 253
1 18.4
216
300
0.5
0.6
435
1 0.2
0.08
3.9
1 8.3
2.8
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
AB-09D
Bedrock
08/08/2018
6.5
7.16
23
198
0.70
-23
182
0.7
88.3
88.3
<0.1
<1
<5
<50
11.1
1.8
225
8.8 Ml
150
<100
<0.5
0.31
258
<0.1
<0.08
<0.025
0.34 j,B
2.8
AB-09D
Bedrock
11/07/2018
6.6
6.95
17
196
0.50
-55
150
1.3
96.2
96.2
<0.1
<1
<2.5
<50
10.6
1.8
220
8.5
151
<100
<0.5
0.37 Sl
242
<0.1
<0.08
<0.025
0.56 SI
2.3
AB-09S
Saprolite
02/09/2018
5.7
7.05
14
130
1.60
39
244
2.5
45.6
45.6
<0.1
2.6
<2.5
53.4 SI
7.07
1.8
79.4
9.1
77
<100
<0.5
0.24
27.4
<0.1
<0.08
0.064 S1
3.7 SI
5.5
AB-09S
Saprolite
05/10/2018
5.6
7.04
25
96
0.50
140
345
9.5
21.4
21.4
<0.1
3.1
2.6
45.6 j
4.87
1.3
64.3
11.5
66 D6
574
<0.5
0.31 SI
30.9
0.037 j
<0.08
1.2
1.6 SI
0.52
AB-09S
Saprolite
08/09/2018
5.3
6.69
26
99
0.70
-100
105
9.7
28.3
28.3
<0.1
4.8
<2.5
55.6 B
4.58
2.1
70.9
11.1
98
1940
<0.5
0.76 B
44.6
0.06 j
<0.08
0.17
2.8
1.2
AB-09S
Saprolite
11/07/2018
5.6
6.69
20
110
0.80
134
339
7.9
29.6
29.6
<0.1
4
5.3
49.6j
5.88
2
79
13.1
81
297
<0.5
0.56 SI
40
0.052j
<0.08
2.5
11.6
1.3
AB-IOBR
Bedrock
02/08/2018
7.0
11.60
13
606
0.40
-99
106
8.8
340 MI
340
<0.1
<1
<2.5
274 SI
114 MI
2.9
4880
17.7
384
<100
<0.5
0.39 SI
226
<0.1
<0.08
<0.025
<0.5
0.15
AB-30BR
Bedrock
05/11/2018
6.9
11.80
19
598
1.10
-24
181
5.3
355
355
<0.1
1.2
<2.5
267 SI
95.3
3
5050
20.7
393 S1
122 S1
<0.5
0.53 S1
234
<0.1
<0.08
<0.025
0.32 j,SI
0.15
AB-IOBR
Bedrock
08/07/2018
7.0
11.61
27
634
0.60
-265
-60
1.0
318
318
<0.1
0.95j
<2.5
273
95.5
3.2
5250
22.5
383
64j
<0.5
0.44
242
<0.1
<0.08
<0.025
<0.5
0.13
AB-IOBR
Bedrock
11/06/2018
6.9
10.60
18
636
0.60
-11
194
1.3
326
326
<0.1
0.88j
<2.5
383
105
3.2
5030
23
389
<100
<0.5
0.3
228
<0.1
<0.08
<0.025
0.22 j,B,S1
0.085j
AB -SOD
Bedrock
02/08/2018
6.3
11.73
13
528
0.40
-10
195
3.8
273
273
<0.1
2
<2.6
1450
74.2
5.1
2780
8.6
319
<100
<0.5
0.82
421
<0.1
<0.08
<0.12 D3
<0.5
9.6
AB-101)
Bedrock
05/11/2018
6.2
11.97
19
531
0.60
-34
171
0.2
294
294
<0.1
2.5
2.8
1360
68.8
5
2790
7.7
322 S1
71.9 j,SI
<0.5
0.84
412
<0.1
<0.08
<0.025
<0.5
11
AB-IOD
Bedrock
08/07/2018
6.2
11.75
28
558
0.50
-220
-15
0.6
273
273
<0.1
2
<2.5
1400
78.4
5.3
3020
10.5
330
<100
<0.5
0.82
442
<0.1
<0.08
<0.025
0.16 j,SI
11.7
AB-10D
Bedrock
11/06/2018
6.2
11.40
19
559
0.50
-4
202
1.2
292
292
<0.1
1.7
<2.5
1450
74
5.2
2830
10.4
338
<100
<0.5
0.75
411
0.019j
<0.08
<0.025
0.25 j,B,S1
10.6
AB-10S
Ash Pore Water
02/08/2018
7.1
9.61
14
2273
0.30
-77
128
8.7
242
242
<0.1
<1
22.3
27000
290
8.2
7210
885 M6
1940
378
<0.5
472
59.7
<0.1
0.22
<0.12 D3
<0.5
1.8
AB-10S
Ash Pore Water
05/11/2018
6.9
9.84
21
1821
0.70
-114
92
6.3
198
198
<0.1
0.91j
13
27000
192
6.6
6010
739
1400
159 SI
0.26j
397
50.3
0.038j
0.12
<0.025
0.2 j,SI
1.2
AB-10S
Ash Pore Water
08/07/2018
6.9
9.85
31
2093
0.30
-117
88
6.7
193
193
<0.1
0.9j
8.1
22900 M6
242 M6
8.8
7130
958
1710
201 S1
0.22j
466
67.2
0.044j
<1.6 D3
<0.025
0.21 j,B,S1
1.4
AB-30S
Ash Pore Water
11/06/2018
6.9
9.63
18
2234
0.40
-121
85
3.2
227
227
<0.1
1.1
11.1
25100
262
8.8
7200
966
1870
183
0.26j
495
68.6
0.04j
0.15
<0.025
0.33 j,B,S1
1.4
AB-10SL
Ash Pore Water
02/08/2018
8.5
10.99
14
1551
0.20
-178
27
4.4
254
254
<0.1
1.7
<2.5
10700
397
7.1
5910
641
1180
285
1.2
1300
453
<0.1
0.19
<0.025
<0.5
2.4
AB-IOSL
Ash Pore Water
05/11/2018
8.2
11.30
21
1550
0.80
-90
115
3.5
239
239
<0.1
1.7
2.8
14100
175
7.1
6190
602
1270
259 SI
1.4
1390
437
0.049j
0.44
<0.025
0.42 j,SI
2.4
AB-IOSL
Ash Pore Water
08/07/2018
8.1
11.13
32
1626
0.50
31
236
1.8
236
236
<0.1
1.7
<2.5
10500
187
7.5
6420
685
1250
229
1.2
1550
478
0.037j
<1.6 D3
<0.025
0.35 j,B,SI
2.3
AB-IOSL
Ash Pore Water
11/06/2018
8.2
10.80
18
1636
0.50
-6
200
3.0
254
254
<0.1
1.7
<2.5
11400
200
7.4
6010
629
1270
311
1.3
1290
415
0.024j
0.22
<0.025
0.62 B,S1
2.4
AB-11D
Bedrock
02/08/2018
6.7
4.65
13
148
2.40
14
219
5.0
70.7
70.7
<0.1
<1
<2.5
77.4 S1
17.7
1.6
1270
3.3
104SI
114 S1
<0.5
0.18 S1
17.2
<0.1
<0.08
0.075 S1
<0.5
<0.1
AB-11D
Bedrock
05/09/2018
6.6
3.65
21
148
1.90
0
205
5.3
68.6
68.6
<0.1
<1
2.7
<50
18.5
1.8
1180
3
95
167
<0.5
0.16
18.8
<0.1
<0.08
0.094
0.3 j,SI
0.11
AB-11D
Bedrock
08/07/2018
6.5
4.22
25
152
2.53
336
541
2.7
67.6
67.6
<0.1
<1
<2.5
<50
17.4
1.7
1200
3.1
122
<100
<0.5
0.15
17.4
<0.1
<0.08
0.096 SI
0.39 j,SI
<0.1
AB-11D
Bedrock
11/12/2018
6.7
3.60
12
148
2.10
-53
152
3.1
76.9
76.9
<0.1
<1
<2.5
<50
17.1
1.8
1140
3.2
103 D6
<100
<0.5
0.11
16.2
<0.1
<0.08
0.064
0.23 j,B,Sl
0.019 j
AB-11S
Saprolite
02/08/2018
5.4
4.61
14
49
0.10
198
403
3.2
20.3
20.3
<0.1
<1
<2.6
<50
1.09
1.7
45.8
<1
<25
<100
<0.5
0.32 Sl
12.9
<0.1
<0.08
0.24
<0.5
0.86
AB-11S
Saprolite
05/09/2018
5.4
4.64
26
50
1.10
-95
111
4.3
17.4
17.4
<0.1
<1
<5
<50
1.05
1.9
38.8
0.62 j
38
<100
<0.5
0.18
10.9
<0.1
<0.08
0.46
0.66 SI
0.62
AB-IIS
Saprolite
08/07/2018
5.6
4.84
26
55
1.39
348
553
4.9
20.5
20.5
<0.1
<1
<2.7
<50
1.22
1.8
49.6
0.61 j
42 D6
166
0.09 j
0.24
13.8
<0.1
<0.08
0.4
0.89 Sl
0.55
AB-11S
Saprolite
11/12/2018
5.7
4.45
30
48
1.00
88
293
1.4
21.5
21.5
<0.1
<1
<2.5
<50
0.967
2.1
38
0.71 j
36
<100
<0.5
0.2
9.9
0.028 j
<0.08
0.24
0.49 j,B,S1
0.6
AB-12BR
Bedrock
02/09/2018
7.9
1.42
12
507
0.40
-187
18
0.3
91.8
91.8
0.16
<1
<2.5
94.6 B,lg,SI
81.7
1.5
9680
157
385
<100
<0.5
0.77
34.5
<0.1
<0.08
<0.025
<0.5
<0.1
AB-12BR
Bedrock
05/11/2018
7.9
0.78
19
538
0.30
-100
105
2.7
93.6
93.6
0.37
1
<2.5
<50
82.4
1.5
8720
158
389 S3
<100
<0.5
1.3
32
<0.1
<0.08
<0.025
0.14 j,SI
<0.1
AB-12BR
Bedrock
08/08/2018
7.7
0.90
28
513
0.50
-156
49
0.6
88.3
88.3
<0.1
<1
<2.5
<50
83.4
1.4
9790
164 M1
387
58 j
<0.5
0.82
31.8
<0.1
<0.08
<0.025
0.18 j,B
<0.1
AB-12BR
Bedrock
11/06/2018
7.8
Top of Column
19
502
0.50
-128
77
1.7
90.9
90.9
<0.1
<1
<2.5
<50
82
1.3
9830
153
368
<100
<0.5
0.62
30.3
<0.1
<0.08
0.053
0.64 B,Sl
<0.1
AB-12D
Bedrock
02/09/2018
7.5
4.11
10
1129
0.60
-225
-20
1.2
116
116
1
10
<5
1530 M1
128 M6
186
10500 M6
164
772
162
<0.5
2.7
56.8
<0.1
<0.08
0.43
10.1
<0.1
AB-12D
Bedrock
05/11/2018
7.3
3.68
22
1005
0.40
-78
127
5.7
111
111
0.36
4.5
<2.5
1160
108
143
11000
168
774
58.4j,Sl
0.22j
3.3
50.5
<0.1
<0.08
0.49
4.1
0.094j
AB-12D
Bedrock
08/08/2018
7.3
3.53
33
989
0.50
-153
52
4.0
104
104
<0.1
4.4
<2.5
1080
114
131
9880
179
678
79.4j
1.2
3.4
49
<0.1
<0.08
0.33 Ml,RI
2.6
0.06j
AB-12D
Bedrock
11/06/2018
7.5
3.28
19
994
0.50
-172
33
2.0
109
109
0.7 M1,R1
3.8
10.6 D6
1050
119
Ill
10300
176
644
<100
0.91
2.9
49.7
<0.1
<0.08
0.25 M1
2.8 S1
0.05j
AB-12S
Ash Pore Water
02/09/2018
7.1
5.22
17
9335
0.10
-141
64
8.8
115
115
<0.1
2.1
23.2
79600 1g
1030
2940
4890
836
6580
128
<0.5
181
223
0.14
<0.08
<0.12 D3
1.4 Sl
0.16
AB-12S
Ash Pore Water
05/11/2018
6.9
5.35
24
10363
0.40
-126
80
8.7
93.1
93.1
<0.1
2.7
17.9
94600
1070
3230
5370
916
7860
161 S1
<0.5
194
241
0.13
<0.08
<0.025
0.4 j,SI
0.18
AB-12S
Ash Pore Water
08/09/2018
7.0
5.05
23
11005
0.50
-112
94
2.7
99.6
99.6
<0.1
2.6
12.5
92900 M6
1120 M6
<1
5810 MI
890
7470
283
<0.5
164
274
0.11
<0.08
<0.025
4.3
0.24
AB-12S
Ash Pore Water
11/06/2018
6.9
4.23
20
11431
0.80
-138
67
3.0
103
103
<0.1
2.5
26.7
103000
1270
3510
6190
1070
7780
<100
0.13j
185
298
0.041j
<0.08
<0.025
2.8 S1
0.21
AB-12SL
Ash Pore Water
02/09/2018
7.4
4.87
14
857
0.20
-180
25
1.2
378
378
<0.1
1.8
12.8
3100 1g
226
72.2
4230
1.8
462
<100
<0.5
1130
896
<0.1
<0.08
<0.12 D3
<0.5
<0.1
AB-12SL
Ash Pore Water
05/11/2018
7.3
5.05
26
904
0.30
-187
18
5.3
390
390
0.12
1.8
12.1
3000
101
81.8
4190
2.6
500 Sl
302 S1
<0.5
1120
878
<0.1
<0.08
<0.025
0.18 j,SI
0.02j
AB-12SL
Ash Pore Water
08/08/2018
6.5
4.83
29
1997
0.20
-148
57
1.7
90.5
90.5
0.066j
1.5
97.2
4200
140
251
4680
<1
952
110
<0.5
824
1460
0.037j
<0.08
<0.025
0.23 j,B
0.14
AB-12SL
Ash Pore Water
11/06/2018
6.4
4.42
19
1980
0.50
-151
54
2.2
68.7
68.7
<0.1
3.3
26
3380
130 M6
451 M6
3900 MI
<1 MI
968
<100
<0.5
377 M1
1020
0.05j
<0.08
<0.025
0.92 B,S1
0.12
AB-13D
Bedrock
02/07/2018
7.6
26.83
9
309
0.40
-120
85
2.4
162
162
<0.1
<1
<2.5
<50
42.4
1.6
688
12.4
221
<100
<0.5
0.3
229
<0.1
<0.08
<0.025
<0.5
2
AB-13D
Bedrock
O5/10/2018
7.4
26.12
21
322
1.00
-97
108
3.9
157
157
<0.1
<1
<5
<50
38.2
1.8
686
14.4
198
<100
<0.5
0.67 S1
209
<0.1
<0.08
0.14 S1
2.7 S1
2.6
AB-13D
Bedrock
08/07/2018
7.5
26.41
23
329
0.40
-162
43
3.8
154
154
<0.1
<1
<2.5
26.2j
42.4
1.9
707
14.5
251
<100
<0.5
0.63
221
<0.1
<0.08
<0.025
0.75 SI
1.9
AB-13D
Bedrock
11/07/2018
7.5
25.80
19
317
0.40
-76
130
1.8
1 164
1 164
1 <0.1
<1
<2.5
<50
42
1.8
682
14.5
218
<100
<0.5
0.63 S1
212
0.017j
<0.08
<0.025 MI,R1
0.87 B,S1
2
AB-13S
Ash Pore Water
02/07/2018
6.9
26.54
10
545
0.60
-58
148
3.9
313
313
<0.1
<1
6.3
758
103
<1
2520
24
376
<100
15.3
730
306
<0.1
0.1
<0.025
<2.5 D3
4.5
AB-13S
Ash Pore Water
05/10/2018
6.8
25.09
23
655
0.40
-85
121
8.2
326
326
<0.1
0.81j
20.9
869
101
1.4
2840
45.2
383
<100
18
559
261
<0.1
0.11
<0.025 P4,R0
0.18 j,51
3.5
Page 7 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
Copper
Iron
Lead
Lithium
Magnesium
Manganese
Mercury
Molybdenum
Nickel
Nitrate
+ Nitrite
Potassium
Selenium
Sodium
Thallium
Vanadium
Zinc
Aluminum
(0.45u)
Antimony
(0.45u)
Arsenic
(0.45u)
Barium
(0.45u)
Beryllium
(0.45u)
Boron
(0.45u)
Cadmium
(0.45u)
Chromium
(0.45u)
Cobalt
(0.45u)
Copper
(0.45u)
Iron
(0.45u)
Reporting Units
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
mg-N/L
mg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
1000
300
15
NE
NE
50
1
NE
100
NE
NE
20
NE
0.2*
0.3*
1000
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Shallow Unit)
3.8
744
0.3
NE
1.8
75.3
0.2
0.5
9.9
2.7
5
0.5
9.1
0.1
5.6
19.2
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Deep Unit)
2.8
272
0.1
NE
14.4
141
0.2
3.2
7.5
1.4
7.8
0.5
29.2
0.1
3.8
17
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Bedrock Unit)
4.2
792
0.2
NE
1 13.2
26.6
0.2
3
7.2
0.4
9.8
0.5
14
1 0.1
16
11.9
NE
NE
NE
I NE
I NE
I NE
I NE
NE
I NE
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
AB-09D
Bedrock
08/08/2018
0.4 j,S1
887
<0.1
16.2
10.6
51
<0.2
2.7
24.3
<0.02
7.82
<0.5
8.58
<0.1
<0.3
5.6 j,B
<100
<0.5
0.24 Sl
231
<0.1
<50
<0.08
<0.5
2.4
0.11 j,S1
838
AB-09D
Bedrock
11/07/2018
0.2 j,S1
1070
<0.1
13.3
10.4
46.2
<0.2
2.6
25.5
<0.02
7.66
<O.5
8.21
<0.1
0.14 j
5.3 j,B
<100
<0.5
0.41
215
0.018 j
<50
<0.08
0.13 j,B,SI
2.1
0.98 SS
975
AB-09S
Saprolite
02/09/2018
1.7 Sl
907
<0.1
<0.5
7.73
788
<0.2
<0.5
5.2
1.7
<5
<0.5
<5
<0.1
<0.3
<10
<100
<0.5
0.18
27.6
<0.1
53.8
<0.08
1.9 sl
5.2
2.4
532
AB-09S
Saprolite
05/10/2018
1.1 S3
1530
0.14
0.32 j,S1
4.87
109
<0.2
<0.5
2.3
1.5
<5
0.25 j
4.41 j
0.11
0.75 S3
<10
70 j
<0.5
0.19
23.7
0.053 j
29.6 j
<0.08
1.1
0.68
1.1 SS
83.5
AB-09S
Saprolite
08/09/2018
1.6
1990
0.45
0.57
4.38
186
<0.2
0.11 j
3.1
1.1
<5
0.35 j
6.33
0.17
1.8
6 j,B,SI
175
0.079 j
0.65
27
0.045 j,S1
53.2
<0.08
1.6 SI
1.1
2 S1
173
AB-09S
Saprolite
11/07/2018
2.1
487
0.23
0.46 j
5.44
227
<0.2
0.24 j,S1
9.4
1.8
<5
<0.5
5.54
0.19
1.3
7.2 j,B
58.1 j
<0.5
0.41
30.1
0.032 j
44 j
<0.08
7.9
1.4
1.6S1
88.8
AB-10BR
Bedrock
02/08/2018
0.72 SI
373
<0.1
25.3
12
35.4
<0.2
<0.5
2.2
<0.02
<5
<0.5
13.4
<0.1
<0.3
<10
<100
<0.5
0.4
214
<0.1
242
<0.08
<0.5
0.13
<0.5
275
AB-10BR
Bedrock
05/11/2018
0.33 j
393
0.046 j,S1
23.6
10.9
28
<0.2
4.7
2.2
<0.02
4.5 j
<0.5
12.6
<0.1
0.27 j,S1
<10
<100
<0.5
0.39
214
<0.1
360
<0.08
<0.5
0.13
<0.5
243
AB-10BR
Bedrock
08/07/2018
0.25 j
361
<0.1
20.8
11.9
26.7
<0.2
0.27 j
2
<0.02
4.74 j
<0.5
14.2
<0.1
<0.3
<10
<100
<0.5
0.42
115
<0.1
49.1 j
<0.08
<0.5
0.12
0.4 j,S1
79.4
AB-10BR
Bedrock
11/06/2018
0.22 j,S1
162
<0.1
20
12.1
32.9
<0.2
0.64
2
<0.02
4.21 j
<0.5
13.5
<0.1
<0.3
<10
<100
<0.5
0.26
210
<0.1
285
<0.08
0.16 j,B,SI
0.079 j
0.11 j,S1
131
AB -SOD
Bedrock
02/08/2018
<0.5
4200
<0.1
8.3
16.2
4000
<0.2
1.6 S1
24.6
<0.02
<5
<0.5
9.46
<0.1
0.68S1
<10
<100
<0.5
0.68
413
<0.1
1340
<0.08
<0.5
9.5
<0.5
3840
AB-10D
Bedrock
05/11/2018
0.42 j
4840
0.036 j,S1
7.9
15.2
4320
<0.2
2.5 S1
26.1
0.011 j
4.64 j
<0.5
8.69
<0.1
0.66 S1
94.7
<100
<0.5
0.72
374
<0.1
1220
<0.08
<0.5
9
0.19 j,S1
3950
AB -SOD
Bedrock
08/07/2018
0.21 j
4780
0.084 j
7.6
17
43SO
<0.2
1.2
25.8
<0.02
4.96 j
<0.5
10.1
<0.1
0.79
3.1 j,S1
<100
<0.5
0.84
398
<0.1
1380
<0.08
0.16 j
10.7
0.33 j,S1
4210
AB-10D
Bedrock
11/06/2018
0.36 j,51
4200
<0.1
7.6
16.5
4280
0.073 j
1.3
25.4
<0.02
4.48 j
<0.5
9.68
<0.1
0.6 S1
<10
<100
<0.5
0.72
386
0.017 j
1350
<0.08
0.17 j,B,SI
10.7
0.21 j,S1
4030
AB-10S
Ash Pore Water
02/08/2018
0.75 Sl
8000
<0.1
3180
70
1770
<0.2
3370
2.3
0.042
127
0.53
109
0.13
0.74 S1
<10
<100
<0.5
480
53.6
<0.1
23400
0.11
<0.5
1.7
1.6 S1
7040
AB-105
Ash Pore Water
05/11/2018
0.13j
5930
0.057 j,S1
2130
50.5
1180
<0.2
2360
1.6
0.011j
97.6
0.17j
72
0.092j
0.55 S1
6.7j
<100
0. 14j
355
43.6
0.045j
18700
0.1
0.16 j,S1
1.1
<0.5
5010
AB -SOS
Ash Pore Water
08/07/2018
0.16 j,B
6560
<0.1
3030
60.5
1250
<0.2
3970
1.7 B
<0.02
109 M6
<0.5
98.7 M6
0.11
0.54 S1
6.4 j,S1
<100
0. 14j
435
SOS SS
0.047j
<50 RO
<0.08
<0.5
1.4
0.41 j,S1
1230 RO
AB-105
Ash Pore Water
11/06/2018
0.72 S1
7130
0.16 S1
2570
64
1660
<0.2
3220
1.7
<0.02
125
<0.5
101
0.17
0.86 S1
7.2j
<100
0.17j
470
62.6
0.023j
23400
0.099
0.14 j,B,SI
1.2
0.67 S1
5480
AB-10SL
Ash Pore Water
02/08/2018
<0.5
314
<0.1
666
64.2
616
<0.2
4140
25.1
<0.02
34.4
0.9
65.9
<0.1
9.2
<10
148
1.3
1330
425
<0.1
10900 M6
0.32
<0.5
2.3
IA S1
226
AB-10SL
Ash Pore Water
05/11/2018
0.12j
287
0.039 j,S1
685
59.7
584
<0.2
4070
27.7
0.058
34.8
0.92
63.5
0.052j
9.6
3.1j
157
1.5
1320
410
0.043j
9830
0.091
0.18 j,S1
2.1
<0.5
200
AB-10SL
Ash Pore Water
08/07/2018
0.22 j,B
287
<0.1
714
65.4
622
<0.2
5010
24.8
<0.02
38.4
0.77
72.5
0.039j
8.9
4.6 j,S1
99.1j
1.2
1370
409
0.038j
10300
0.04j
0.22j
2.5
<0.5
243
AB-10SL
Ash Pore Water
11/06/2018
0.75 S1
359
0.14
653
63.4
616
<0.2
4230
25
<0.02
35.2
0.89
67.3
0.056j
9.3
5j
82.3j
1.2
1310
404
0.015j
10200
0.15
0.36 j,B,SI
2.3
0.89 S1
232
AB-11D
Bedrock
02/08/2018
0.84 S1
169 SI
<0.1
5.4
3.18
<5
<0.2
0.76 SI
<0.5
0.29
<5
<0.5
8.41
<0.1
0.75 S1
<10
<100
<0.5
0.14
13.4
<0.1
85.6 SI
<0.08
<0.5
<0.1
<0.5
<50
AB-11D
Bedrock
05/09/2018
0.47 j,B
203
0.086 j
6.2
2.82
6.2
<0.2
0.65
0.48 j
0.25
<5
<0.5
8.44
<0.1
0.8 S1
56.8
<100
<0.5
0.14
12.6
<0.1
<50
<0.08
0.16 j
0.023 j
0.8 B
<50
AB-11D
Bedrock
08/07/2018
0.19 j,B
<50
<0.1
5.3
2.99
<5
<0.2
0.58
0.48 j
0.25
<5
<0.5
8.82
<0.1
0.32S1
50.6
<100
<0.5
0.14
15.3
<0.1
<50
<0.08
0.18 j
<0.1
0.44 j,S1
<50
AB-11D
Bedrock
11/12/2018
0.19 j,S1
<50
<0.1
4.4
3.14
<5
<0.2
0.71
<0.5
0.24
<5
<0.5
8.14
<0.1
0.53
<10
<100
<0.5
0.1
15
<0.1
27.6 j
<0.08
0.22 j
0.013 j
0.38 j,BC,Sl
<50
AB-11S
Saprolite
02/08/2018
0.72 SI
150
<0.1
<0.5
0.473
88
<0.2
<0.5
0.56 SI
0.038
<5
<0.5
6.88
<0.1
0.s8 SS
<10
<100
<0.5
0.19
10.8
<0.1
<50
<0.08
<0.5
0.8
IA SI
<50
AB-11S
Saprolite
05/09/2018
1.5 B
134
0.062 j
<0.5
0.476
55
<0.2
<0.5
0.32 j
0.064
3.39 j
<0.5
6.84
<0.1
0.41 S1
<10
<100
<0.5
0.16
8.4
<0.1
<50
<0.08
0.44 j
0.64
0.54 B
<50
AB-11S
Saprolite
08/07/2018
0.13 j,B
299
0.042 j
0.38 j,B
0.527
56.3
<0.2
0.076 j
0.51
0.099
3.43 j
0.17 j
7.39
<0.1
0.74
3.2 j,B,SI
<100
<0.5
0.19
9.3
<0.1
<50
<0.08
0.39 j
0.57
0.53 Sl
<50
AB-11S
Saprolite
11/12/2018
0.47 j,S1
79.5
<0.1
<2.5
0.44
49.8
<0.2
<0.5
<0.5
0.05
3.7 j
<0.5
6.48
<0.1
0.6
<10
<100
<0.5
0.17
9.5
0.013 j
<50
<0.08
0.5 j
0.56
0.46 j,BC,S1
<50
AB-12BR
Bedrock
02/09/2018
<0.5
125 SI
<0.1
6.6
3.13
32.8
<0.2
2.2
<0.5
<0.02
<5
<0.5
16.3
<0.1
<0.3
<10
<100
<0.5
0.48
34
<0.1
<50
<0.08
<0.5
<0.1
2.1 S1
126
AB-12BR
Bedrock
05/11/2018
<0.5
97.1
<0.1
4.9
3
34.8
<0.2
2.6
<0.5
<0.02
3.52 j
<0.5
21.3
<0.1
0.086 j,S1
<10
69.8 j
<0.5
0.59
30
<0.1
<50
<0.08
0.25 j,S1
<0.1
<0.5
134
AB-12BR
Bedrock
08/08/2018
0.7 Sl
143
<0.1
5.8
3.09
29.9
<0.2
2.1
<0.5
<0.02
3.51 j
<0.5
13.7
<0.1
<0.3
4 j,B
<100
<0.5
0.56 Sl
28.4
<0.1
<50
<0.08
<0.5
<0.1
0.21 j,S1
121
AB-12BR
Bedrock
11/06/2018
0.84 S1
161
<0.1
5.7
3.07
27.7
<0.2
2.1
1.2
<0.02
3.23 j
<0.5
12.7
<0.1
<0.3
3.2 j
<100
<0.5
0.56
28.4
<0.1
<50
<0.08
0.23 j,B,SI
<0.1
0.35 j,S1
134
AB-12D
Bedrock
02/09/2018
<0.5
174 SI
<0.1
8.1
4.6
116
<0.2
<0.5
4.9
<0.02
<5
<0.5
90.4
<0.1
<0.3
<10
<100
<0.5
3.1
55.7
<0.1
1280
<0.08
2.7 S1
<0.1
<0.5
63.7
AB-12D
Bedrock
05/11/2018
0.34 j
126
0.041 j,S1
5.9
4.16
120
<0.2
0.78 S1
3.5
<0.02
4.82 j
<0.5
76.6
<0.1
0.23 j,S1
<10
<100
0.22 j
3.2
48.2
<0.1
1120
<0.08
1.7 S1
0.072 j
<0.5
93.2
AB-12D
Bedrock
08/08/2018
0.25 j,S1
122
0.12
6
3.95
121
<0.2
0.42 j
1.9
<0.02
4.47 j
<0.5
66.5
<0.1
0.1 j
3.9 j,B
56.4 j,S1
1.1
3.3
44.6
<0.1
997
<0.08
1.5 sl
0.044 j
<0.5
80.5
AB-12D
Bedrock
11/06/2018
0.51 S1
116
<0.1
5.5
4.21
115
0.098 j
0.43 j
4
<0.02
4.18 j
<0.5
63.3
<0.1
0.26 j,S1
2.6 j
<100
0.62
2.6
44.7
<0.1
958
<0.08
1.4 B
0.034 j
0.17 j,S1
99.3
AB-12S
Ash Pore Water
02/09/2018
<0.5
13300
<0.1
92.1
643
7000
<0.2
3.4
0.91 SI
<0.02
14.6
1.3
28.4
<0.1
0.33S1
<10
140
<0.5
153
212
0.54
91500
<0.08
<0.5
0.16
<0.5
11800
AB-12S
Ash Pore Water
05/11/2018
<0.5
13300
<0.1
91.2
683
7440
<0.2
4
1.2
0.012j
16.3
1.3
31
0.059j
0.9 Sl
4.2j
134
<0.5
173
222
0.16
91700
<0.08
0.2 j,S1
0.15
0.76 SI
11800
AB-12S
Ash Pore Water
08/09/2018
0.25 j
14500
0.067 j
93.6
723 M6
7750 M1
<0.2
6.8
2.5
<0.02
17
1.4
31.8 M1
0.097 j
0.2 j
11.1 sl
<100
<0.5
145
261
0.092 j,S1
84400
<0.08
0.75 SI
0.19 S1
0.15 j,51
14300
AB-12S
Ash Pore Water
11/06/2018
0.34 j,S1
19500
<0.1
88.2
804
8860
<0.2
9.2
1.9
<0.02
17.1
0.71
36.9
0.29
0.77 Sl
47
<100
<0.5
170
267
0.033 j
88200
<0.08
0.44 j,B,SI
0.16
0.33 j,S1
16900
AB-12SL
Ash Pore Water
02/09/2018
<0.5
7420
<0.1
134
35.7
1030
<0.2
322
1.5 sl
<0.02
10.2
<0.5
<5
<0.1
0.81
<10
<100
<0.5
1250
911
<0.1
2980
<0.4 D3
<0.5
<0.1
<0.5
6650
AB-12SL
Ash Pore Water
05/11/2018
<0.5
6290
<0.1
126
36.8
1010
<0.2
345
1.6
<0.02
10.4
<0.5
2.56 j
<0.1
0.73 S3
<10
<100
<0.5
1250
834
<0.1
2850
<0.08
<0.5
<0.1
<0.5
5890
AB-12SL
Ash Pore Water
08/08/2018
<0.5
87100
<0.1
84.7
53.8
6970
<0.2
90.7
0.89
0.056
8.6
0.15 j
6.29
<0.1
0.68
<10
55 j,S1
<0.5
916
1220
<0.1
3540
<0.08
<0.5
0.11
0.24 j,S1
62000
AB-12SL
Ash Pore Water
11/06/2018
0.41 j,S1
173000 M6
<0.1
13.9
49.8 M1
8950 M1
0.073j
18
2
<0.02
<25
<0.5
10.3
<0.1
0.8 51
5.2j
<100
<0.5
486
1030
0.035j
3130
<0.08
0.21 j,B,SI
0.081j
0.12 j,S1
143000
AB-13D
Bedrock
02/07/2018
<0.5
804
<0.1
7.5
8.8
221
<0.2
1.2
<0.5
<0.02
<5
<0.5
10.4
<0.1
<0.3
<10
<100
<0.5
0.27
185
<0.1
<50
<0.08
<0.5
2
<0.5
597
AB-13D
Bedrock
05/10/2018
0.33 j,S1
1040
<0.1
8.5
8.62
212
<0.2
1.5
0.36 j
<0.02
5.54
<0.5
9.46
<0.1
<0.3
28.3 B
<100
<0.5
1.5 S1
175
<0.1
<50
<0.08
<0.5
1.7
0.21 j,S1
510
AB-13D
Bedrock
08/07/2018
0.42 j,B
1060
<0.1
8.8
8.74
223
<0.2
1.5
1.6
<0.02
6.16
<0.5
11
<0.1
<0.3
3.5 j,B,SI
<100
<0.5
0.29
191
<0.1
<50
<0.08
<0.5
1.8
0.28 j,S1
576
AB-13D
Bedrock
11/07/2018
1.5 SI
904
<0.1
7.6
8.94
251
<0.2
1.4
<0.5
<0.02
5.21
<0.5
10.2
<0.1
0.22 j
4.1 j
<100
<0.5
0.22
181
<0.1
<50
<0.08
0.4 j,B,SI
1.3
0.29 j,BC,Sl
549
AB-13S
Ash Pore Water
02/07/2018
<2.5 D3
40SO
<0.1
59.4
13.2
253
<0.2
51.4
7.4
0.021
6.07
<2.5 D3
1 <5
0.66
10.7
<10
<100
15.5
661
263
<0.1
683
1 0.09
1 <2.5 D3
4.2
<2.5 D3
3720
AB-13S
Ash Pore Water
05/10/2018
0.14 j,S1
2570
<0.1
58
15.5
217
<0.2
47
5.6
<0.02
6.68
4.2
4.7 j
1
16.3
3.4 j,B,PB
<100
17.5
419
228
<0.1
770
0.095
0.19 j
3.5
0.33 j,S1
2040
Page 8 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
RADIONUCLIDES
OTHER PARAMETERS
Lead
(0.45u)
Manganese
(0.45u)
Mercury
(0.45u)
Molybdenum
(0.45u)
Nickel
(0.45u)
Phosphorus
(0.45u)
Selenium
(0.45u)
Silver
(0.45u)
Strontium
(0.45u)
Thallium
(0.45u)
Vanadium
(0.45u)
Zinc
(0.45u)
Radium-226
Radium-228
Total
Radium
Uranium-238
Total
Uranium
Uranium-238
DIS
Carbonate
Alkalinity
Fluoride
Phosphorus
Reporting Units
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pCi/L
pCi/L
pCi/L
ug/mL
ug/mL
ug/mL
mg/L
mg/L
mg/L
15A NCAC 02L Standard
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5A
NE
0.03A
NE
NE
2
NE
Background Threshold Values (Shallow Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
3
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Deep Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
2.8
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Bedrock Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5.7
NE
0.0005
NE
5
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
AB-09D
Bedrock
08/08/2018
<0.1
44
<0.2
2.4
23.6
0.059
0.27 j,S1
NA
204
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.42
0.035 j
AB-09D
Bedrock
11/07/2018
<0.1
41.7
<0.2
2.5
23.3
0.03 j
<0.5
NA
206
<0.1
0.14 j,B,SI
6.2 j,S1
NA
NA
NA
NA
NA
NA
<5
0.36
0.032 j
AB-09S
Saprolite
02/09/2018
<0.1
727
<0.2
<0.5
5.1
<0.05
<0.5
NA
76.5
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.13
<0.05
AB-09S
Saprolite
O5/10/2018
0.03 j
109
<0.2
<0.5
2.2 SI
<0.05
0.22 j
NA
54.8
0.11
0.22 j
<10
NA
NA
NA
NA
NA
NA
<5
0.1
0.054
AB-09S
Saprolite
08/09/2018
0.18
151
<0.2
0.12 j
2.4 S1
0.081
0.24 j
NA
55.7
0.18
1.1
<10
NA
NA
NA
NA
NA
NA
<5
0.14
0.14
AB-09S
Saprolite
11/07/2018
<0.1
212
<0.2
0.15 j
10.5
0.05 j
<0.5
NA
67.8
0.19
0.57 B,S1
4.3 j,S1
NA
NA
NA
NA
NA
NA
<5
0.1
0.075
AB-10BR
Bedrock
02/08/2018
<0.1
35.5
<0.2
0.62
2.1
<0.05
<0.5
NA
4400
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.52
<0.05
AB-10BR
Bedrock
05/11/2018
<0.1
30.4
<0.2
0.2 j
2.1 S1
<0.05
<0.5
NA
4640
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.58
<0.05
AB-10BR
Bedrock
08/07/2018
<0.1
4810
<0.2
0.75
2.4
<0.05
<0.5
NA
28.9
<0.1
<0.3
14.7
NA
NA
NA
NA
NA
NA
<5
0.59
0.031 j
AB-10BR
Bedrock
11/06/2018
<0.1
35
<0.2
0.74
2
0.03 j
<0.5
NA
4390
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.56
<0.05
AB -SOD
Bedrock
02/08/2018
<0.1
3810
<0.2
1.2
25.5
0.074
<0.5
NA
2660
<0.1
0.7
<10
NA
NA
NA
NA
NA
NA
<5
0.23
0.055
AB-10D
Bedrock
05/11/2018
<0.1
3740
<0.2
2.8 SI
23.1
0.06
<0.5
NA
2510
<0.1
0.66 SI
60.6
NA
NA
NA
NA
NA
NA
<5
0.26
0.06
AB -SOD
Bedrock
08/07/2018
0.049j
3950
<0.2
1.8
29
0.05j
<0.5
NA
2530
<0.1
0.67
3.3j
NA
NA
NA
NA
NA
NA
<5
0.26
0.081
AB-10D
Bedrock
11/06/2018
<0.1
3930
<0.2
1.4
25.4
0.066
<0.5
NA
2580
<0.1
0.59
<10
NA
NA
NA
NA
NA
NA
<5
0.27
0.065
AB -SOS
Ash Pore Water
02/08/2018
<0.1
1600
<0.2
3310
2.2
0.4
<0.5
NA
6630
0.12
0.43
10.1
NA
NA
NA
NA
NA
NA
<5
1
0.44
AB-105
Ash Pore Water
05/11/2018
<0.1
1020
<0.2
2300
1.5 S1
0.28
<0.5
NA
5160
0.089j
0.36 S1
3.9j
NA
NA
NA
NA
NA
NA
<5
0.91
0.29
AB -SOS
Ash Pore Water
08/07/2018
0.044j
6050 RO
<0.2
3060
1.7
0.44
0.26j
NA
26.6 RO
0.12
0.45
12 RO
NA
NA
NA
NA
NA
NA
<5
1.1
0.46
AB-105
Ash Pore Water
11/06/2018
<0.1
1540
<0.2
3500
1.8
0.4
<0.5
NA
6920
0.14
0.43
6.6 j
NA
NA
NA
NA
NA
NA
<5
1.1
0.42
AB-10SL
Ash Pore Water
02/08/2018
<0.1
585
<0.2
4180
24.5
0.47
0.81
NA
5380
<0.1
9.2
<10 MI
NA
NA
NA
NA
NA
NA
<5
4.7
0.47
AB-10SL
Ash Pore Water
05/11/2018
<0.1
565
<0.2
4150
23.5
0.39
0.85
NA
5500
0.054j
8.5
3.3j
NA
NA
NA
NA
NA
NA
<5
5
0.41
AB-10SL
Ash Pore Water
08/07/2018
<0.1
585
<0.2
4270
26.3
0.68
0.9
NA
4920
0.05j
9.5
3.3j
NA
NA
NA
NA
NA
NA
<5
5.1
0.73
AB-10SL
Ash Pore Water
11/06/2018
<0.1
587
<0.2
4260
24.8
0.43
0.74
NA
5310
0.044j
8.5
<10
NA
NA
NA
NA
NA
NA
<5
4.9
0.44
AB-11D
Bedrock
02/08/2018
<0.1
<5
<0.2
0.75
<0.5
<0.05
<0.5
NA
1040
<0.1
0.55
<10
NA
NA
NA
NA
NA
NA
<5
0.57
<0.05
AB-11D
Bedrock
05/09/2018
<0.1
<5
<0.2
0.71
0.4 j
<0.05
<0.5
NA
985
<0.1
0.6
50
NA
NA
NA
NA
NA
NA
<5
0.56
1 <0.05
AB-11D
Bedrock
08/07/2018
<0.1
<5
<0.2
0.57
0.81
<0.05
<0.5
NA
1030
<0.1
0.42
2.8 j,B
NA
NA
NA
NA
NA
NA
<5
0.67
<0.05
AB-11D
Bedrock
11/12/2018
<0.1
<5
<0.2
0.64 B
<0.5
0.032 j
<0.5
NA
1010
<0.1
0.48
2.7 j
NA
NA
NA
NA
NA
NA
<5
0.64
0.03 j
AB-11S
Saprolite
02/08/2018
<0.1
73.7
<0.2
<0.5
<0.5
0.085
<0.5
NA
39.1
<0.1
0.49
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.1
AB-115
Saprolite
05/09/2018
<0.1
46.2
<0.2
<0.5
0.96
0.071
<0.5
NA
30.5
<0.1
0.52
<10
NA
NA
NA
NA
NA
NA
<5
0.055 j
0.12
AB-11S
Saprolite
08/07/2018
<0.1
43.1
<0.2
<0.5
0.48 j
0.073
<0.5
NA
31.8
<0.1
0.32
<10
NA
NA
NA
NA
NA
NA
<5
0.076 j,M1
0.15
AB-11S
Saprolite
11/12/2018
<0.1
43.7
<0.2
<0.5
0.52
0.1
<0.5
NA
34.6 S1
<0.1
0.51
5.5 j
NA
NA
NA
NA
NA
NA
<5
0.066 j
0.12
AB-12BR
Bedrock
02/09/2018
<0.1
28.2
<0.2
2.3
<0.5
<0.05
<0.5
NA
9640
<0.1
<0.3
<10
1.17
5.34
6.51
0.0014
0.0014
NA
<5
2.3
<0.05
AB-12BR
Bedrock
05/11/2018
<0.1
25.7
<0.2
2.1
<0.5
<0.05
<0.5
NA
9060
<0.1
<0.3
<10
0.857
5.15
6.01
0.0015
0.0015
0.0017
<5
2.7
<0.05
AB-12BR
Bedrock
08/08/2018
<0.1
26.2
<0.2
2.2
<0.5
<0.05
0.17 j,S1
NA
8940
<0.1
<0.3
<10
0.656
5.4
6.06
0.0017
0.0017
0.0018
<5
2.7 M1
<0.05
AB-12BR
Bedrock
11/06/2018
<0.1
25.1
<0.2
1.9
1.2
<0.05
<0.5
NA
8980
<0.1
<0.3
<10
0.687 U
4.11
4.8
NA
0.0017
NA
<5
2.7
<0.05
AB-12D
Bedrock
02/09/2018
<0.1
120
<0.2
0.73
2.4
<0.05
<0.5
NA
11200
<0.1
<0.3
<10
1.29
6.01
7.3
<0.0005
<0.0005
NA
<5
1.7
<0.05
AB-12D
Bedrock
05/11/2018
<0.1
114
<0.2
0.65
2.2 S1
<0.05
<0.5
NA
9760
<0.1
0.091 j,S1
<10
0.824
5.72
6.54
0.0004 j
0.0004 j
0.00038 j
<5
2.1
<0.05
AB-12D
Bedrock
08/08/2018
<0.1
113
<0.2
0.36 j,S1
1.1 Sl
<0.05
0.16j,S1
NA
9540
<0.1
0.06j
<10
0.639 U
6.77
7.41
0.00032j
0.00032j
0.00032j
<5
2.2
<0.05
AB-12D
Bedrock
11/06/2018
<0.1
106
<0.2
0.34 j
2.3
0.034 j
0.35 j
NA
9320 M1
<0.1
0.21 j
<10
1.53
6.3
7.83
NA
0.00028 j
NA
<5
2.2
0.04 j
AB-12S
Ash Pore Water
02/09/2018
<0.1
6620
<0.2
3.8
<0.5
0.51
0.69
NA
4600
<0.1
0.32
<10
0.512
1.23
1.742
<0.0005
<0.0005
NA
<5
4.8
0.58
AB-12S
Ash Pore Water
05/11/2018
<0.1
7000
<0.2
3.8
1.3 SI
0.46
1.3
NA
5040
<0.1
0.26 j,S1
2.8 j
0.82
-0.0974 U
0.82 U
0.00046 j
0.00046 j
0.00042 j
<5
6.1
0.47
AB-12S
Ash Pore Water
08/09/2018
<0.1
7960
<0.2
5.9
IA SI
0.49
1.4
NA
4930
0.034j
0.32 SI
3.4j
0.676 U
1.4
2.08
0.00048j
0.00048j
0.00044j
<5
3.2
0.54
AB-12S
Ash Pore Water
11/06/2018
<0.1
8180
<0.2
8.8
1.3
0.52
0.77
NA
5310
<0.1
0.39
4.4j
0.851
1.51
2.36
NA
0.00056
NA
<5
2.8
0.55
AB-12SL
Ash Pore Water
02/09/2018
<0.1
995
<0.2
398
1.6 S1
0.38
<0.5
NA
4240
<0.1
0.65
<10
0.536
0.76
1.296
<0.0005
<0.0005
NA
<5
2.8
0.39
AB-12SL
Ash Pore Water
05/11/2018
<0.1
956
<0.2
375
1.5 S1
0.33
0.18j
NA
4000
<0.1
0.66 SI
<10
0.0606 U
1.66
1.72 U
0.0001j
0.0001j
0.000085j
<5
3.3
0.34
AB-12SL
Ash Pore Water
08/08/2018
<0.1
5120
<0.2
139
0.96 S1
0.46
<0.5
NA
4150
<0.1
0.66
2.7 j
1.03
1.25
2.28
<0.0005
<0.0005
<0.0005
<5
1.7
0.41
AB-12SL
Ash Pore Water
11/06/2018
<0.1
7650
<0.2
28.3
1.3
0.16
<0.5
NA
3600
<0.1
0.63
5.6 j
0.986
2.07 D6
3.06
NA
<0.0005
NA
<5
1.1 M1
0.15
AB-13D
Bedrock
02/07/2018
<0.1
187
<0.2
1.4
<0.5
<0.05
<0.5
NA
650
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.55
<0.05
AB-13D
Bedrock
05/10/2018
<0.1
175
<0.2
1.6
0.31 j,S1
<0.05
<0.5
NA
572
<0.1
<0.3
34.6
NA
NA
NA
NA
NA
NA
<5
0.65
0.033 j
AB-13D
Bedrock
08/07/2018
<0.1
194
<0.2
1.5
3
<0.05
<0.5
NA
618
<0.1
<0.3
12.7 B
NA
NA
NA
NA
NA
NA
<5
0.58
<0.05
AB-13D
Bedrock
11/07/2018
<0.1
180
<0.2
1.3
<0.5
<0.05
<0.5
NA
615
<0.1
0.14 j,B,S1
<10
NA
NA
NA
NA
NA
NA
<5
0.58
<0.05
AB-13S
Ash Pore Water
1 02/07/2018
<0.1
234
<0.2
1 51.5
1 6.8
1 0.41
1 4.1
1 NA
2510
1 0.68
1 10.8
1 <10
I NA
NA
NA
NA
NA
NA
1 <5
1 0.17
1 0.46
AB-13S
Ash Pore Water
1 05/10/2018
<0.1
201
<0.2
1 46.8
1 5.9
1 0.34
1 3.7
1 NA
2530
1 1
1 14.8
1 3.4 j
I NA
NA
NA
NA
NA
NA
1 <5
1 0.2
1 0.33
Page 9 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
FIELD PARAMETERS
WATER QUALITY PARAMETERS
SELECTED 40CFR257 APPENDIX III CONSTITUENTS plus Sr
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
PH
Water
Level
Temp
Spec
Cond
DO
ORP
Eh
Turbidity
Alkalinity
Bi-
carbonate
Alkalinity
Sulfide
Total
Organic
Carbon
Total
Suspended
Solids
Boron
Calcium
Chloride
Strontium
Sulfate
Total
Dissolved
Solids
Aluminum
Antimony
Arsenic
Barium
Beryllium
Cadmium
Chromium
(VI)
Chromium
Cobalt
Reporting Units
S.U.
ft
Deg C
Nmhos/cm
mg/L
mV
mV
NTUs
mg/L
mg/L
mg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
pg/L
pg/L
Ng/L
pg/L
Ng/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
6.5-8.5
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
700
NE
250
NE
250
Soo
NE
1*
10
700
4*
2
10
10
1*
Background Threshold Values (Shallow Unit)
4.6-6.4
NE
NE
NE
NE
NE
NE
NE
63
63
0.1
1
NE
5o
10.7
5.5
303
4.2
140
757
0.5
0.4
310
0.2
0.08
5.7
16.5
1.2
Background Threshold Values (Deep Unit)
5.7-6.9
NE
NE
NE
NE
NE
NE
NE
204
204
0.1
1
NE
50
13.1
4.7
665
17.7
183
128
0.5
0.6
127
0.1
0.08
3
7.6
1.9
Background Threshold Values (Bedrock Unit)
5.6-7.6
NE
NE
NE
NE
NE
I NE
NE
1 108
1 108
1 0.1
1
NE
50
15
1 4.5
253
18.4
216
1 300
1 0.5
1 0.6
1 435
1 0.2
t0.08
3.9
1 8.3
2.8
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
AB-13S
Ash Pore Water
08/07/2018
6.7
25.58
30
694
0.50
-55
150
8.4
321
321
<0.1
0.66j
8.3
936
116
1.5
3270
47.1
430
<100
19
606
299
<0.1
0.11
<0.025
0.21 j,S1
4.3
AB-13S
Ash Pore Water
11/07/2018
6.8
24.82
19
708
0.40
-50
155
8.5
345
345
<0.1
0.54j
5.3
958
113
1.5
3310
62.4
455
<100
18.8
607
282
<0.1
0.11
<0.025
0.5 j,B,Sl
4.7
AB-14D
Transition Zone
02/09/2018
5.9
14.54
17
197
1.60
106
311
1.2
43.4
43.4
<0.1
<1
<2.6
394 S1
17.9
1.7
498
45.3
145
<100
<0.5
0.12
177
<0.1
<0.08
2
2.4 SI
<0.1
AB-14D
Transition Zone
05/10/2018
5.8
11.86
20
210
1.10
102
307
0.6
42.4
42.4
<0.1
<1
<5
404
19.4
1.9
514
52.3
115
73.2j
<0.5
0.36 S1
180
<0.1
0.033j
2.1
2.8 S1
0.055j
AB-14D
Transition Zone
08/08/2018
5.7
13.14
23
217
1.00
116
321
1.4
43.5
43.5
0.071 j
<1
<2.5
423
21.6
1.9
526
58.1
157
65.4 j
<0.5
0.24
176
<0.1
<0.08
2
0.17 j,B
0.021 j
AB-14D
Transition Zone
11/12/2018
5.9
11.04
13
217
1.30
57
262
0.4
47.2
47.2
<0.1
<1
<5
462
22.6
1.9
565
58.5
162
<100
<0.5
0.078j
180
0.027j
<0.08
2
2.3
0.035j
AB-14DU
Saprolite
08/13/2018
5.9
14.45
22
111
2.30
117
322
6.6
42
42
<0.1
<1
<2.5
61.4
8.63
1.8
229
10.4
107
62 j
0.31 j
0.17
97.2
0.037 j
0.037 j
0.22
38.3
1.6
AB-14DU
Saprolite
11/12/2018
5.8
11.85
13
129
1.90
5
210
9.3
48.3
48.3
<0.1
<1
2.7
99.9
9.95
1.9
272
14.2
99
125
<0.5
0.19
114
0.018 j
<0.08
0.87
IA SI
1.1
AB-14S
Ash Pore Water
02/09/2018
6.6
16.46
16
2548
0.20
-23
182
7.4
336
336
<0.1
2.1
49.9
15800
198
9.4
4110
1040
2230
365
<0.5
856
42.9
<0.1
<0.08
<0.25 D3
0.51 SS
<0.1
AB-14S
Ash Pore Water
05/10/2018
6.6
13.18
22
2075
0.20
-59
146
5.1
295
295
<0.1
1.4
32.6
11600
157
7.2
3320
816
1520
371
0.16j
918
36.4
0.057j
<0.08
<0.025
1 SI
0.041j
AB-14S
Ash Pore Water
08/08/2018
6.6
14.53
22
1514
0.20
-121
84
5.2
258
258
<0.1 MI,R1
0.94j
30.2
6160
132
4.6
2400
555
1160
314
0.087j
753
35.1
0.067j
<0.08
<0.025
0.41 j,B
0.077j
AB-14S
Ash Pore Water
11/12/2018
6.7
12.25
14
1884
0.20
-93
112
1.9
285
285
<0.1
0.96j
9.8 D6
9490
166
6.2
3450
808
1560
62.3j
0.26j
786
45.3
0.035j
<0.08
<0.025
0.25 j,B,S1
0.082j
AB-15BR
Bedrock
02/07/2018
7.4
15.65
12
429
0.40
-151
54
5.4
156
156
<0.1
<1
5.3
<50
63.4
2
1030
59.4
298
<100
<0.5
<0.1
108
<0.1
<0.08
<0.025
<0.5
<0.1
AB-15BR
Bedrock
05/10/2018
7.3
14.47
22
441
0.46
188
393
1.0
153
153
<0.1
<1
5.9
<50
57.5
2.2
1030
63.8
231
<100
<0.5
0.11 SS
99
<0.1
<0.08
<0.025
0.16 j,S1
<0.1
AB-15BR
Bedrock
08/08/2018
7.4
15.58
25
423
0.50
-333
-128
1.0
146
146
<0.1
<1
6.3
<50
63.6 M1
2.2
1150
74.8
299
52.8j
<0.5
0.12
108
<0.1
0.034j
<0.025 M1,R1
2.3
0.043j
AB-15BR
Bedrock
11/09/2018
7.3
14.66
10
416
0.60
-67
138
0.8
158
158
<0.1
<1
5.8
<50
66.9
2.2
1050
72.8
302
<100
<0.5
0.081j
110
0.012j
<0.08
<0.025
0.19j
0.024j
AB-15D
Bedrock
02/07/2018
7.0
19.28
11
410
0.30
-35
170
1.4
197
197
<0.1
<1
5.2 S1
<50
56.7 M1
2.4
640
29.2
284
<100
<0.5
<0.1
260
<0.1
<0.08
0.035 S1
<0.5
<0.1
AB-15D
Bedrock
05/10/2018
6.7
18.26
18
407
0.30
-60
145
2.2
185
185
<0.1
0.57 j
6.8
29.9 j,S1
58.1
2.7
622
31.1
234 D6
55.4 j
<0.5
0.1 SS
241
0.06 j
<0.08
<0.025
2.3 S1
0.071 j
AB-15D
Bedrock
08/08/2018
7.0
19.22
24
433
0.40
-110
95
2.0
182
182
<0.1
<1
6.4
27.1j
62
2.7
654
36.5
283
74j
<0.5
0.1
251
0.072j
<0.08
<0.025
0.19j
0.024j
AB-15D
Bedrock
11/09/2018
6.9
18.44
11
413
0.30
73
278
0.8
195
195
<0.1
<1
<5
28.6j
68.8
2.7
668
35.1
272
<100
<0.5
0.12
266
0.058j
<0.08
<0.025
0.46j
0.035j
AB-15S
Ash Pore Water
02/07/2018
6.8
17.41
11
1029
0.20
-105
100
5.3
432 MI
432
<0.1
1.5
44.6
3400
138
42.4
4980
70.6
606
106
<0.5
2120
571
<0.1
<0.08
<0.025
<2.5 D3
2.9
AB-15S
Ash Pore Water
05/10/2018
6.7
16.02
19
947
0.48
229
434
2.2
401
401
<0.1
1.1
34
2720
106
32.5
4200
63.6
502
55.3j
0.45j
2010
420
<0.1
0.12
<0.025
6
3
AB-15S
Ash Pore Water
08/08/2018
6.9
17.21
24
964
0.30
-162
43
1.2
368
368
<0.1
0.61j
43.9
3070
116
34.5
4350
53.5 M1
568
72.2j
<0.5
2050
455
<0.1
<0.08
<0.025
0.19j
1.3
AB-15S
Ash Pore Water
11/09/2018
6.8
16.53
10
959
0.40
-156
50
1.1
460
460
<0.1
0.94j
46.9
2980
116
38.5
4600
58
558
<100
<0.5
2330
512
0.01j
<0.08
<0.025
0.14j
3.2
AB-15SL
Ash Pore Water
02/07/2018
7.2
21.09
10
703
0.20
-144
61
4.7
284
284
<0.1
1.3
33
1910
93.4
3.6
2840
85.7
465
132
<0.5
1050
672
<0.1
<0.08
<0.025
<0.5
3.7
AB-15SL
Ash Pore Water
05/10/2018
6.9
20.50
23
640
0.20
-135
70
3.8
270
270
<0.1
1.1
29.8
1430
76.5
3.6
2250
94
395
96.8j
<0.5
862
478
<0.1
<0.08
<0.025
0.32 j,S1
5.3
AB-15SL
Ash Pore Water
08/08/2018
7.0
21.33
24
580
0.40
-331
-126
3.5
229
229
<0.1
0.64j
35.9
1220
74.4
3.9
2070
93.9
398
271
<0.5
748
489
<0.1
<0.08
<0.025
0.29j
4.7
AB-15SL
Ash Pore Water
11/09/2018
6.8
20.53
10
485
0.40
-96
109
3.2
205
205
<0.1
0.97j
27.6
993
66.8
3.3
1770
88.2
378
121
<0.5
493
390
0.022j
<0.08
<0.025
0.24j
7.3
AB-16D
Bedrock
02/08/2018
6.9
6.11
16
272
0.50
-98
107
9.1
115
115
<0.1
<1
<2.5
<50
25.9
3.3
393
24.5
186 S1
<100
<0.5
0.78
185
<0.1
<0.08
<0.025
<0.5
0.21
AB-16D
Bedrock
05/10/2018
6.9
5.40
26
297
0.70
-94
111
2.6
108
108
<0.1
1.6
3.2
<50
22
3.3
397
23.9
154
<100
<0.5
1 S1
186
<0.1
<0.08
0.028 SI
0.31 j,S1
0.26
AB-16D
Bedrock
08/08/2018
6.9
6.93
28
350
0.60
-91
115
0.6
121
121
<0.1
1.7
<2.5
<50
21.7
3.4
394
26.3
231
<100
<0.5
0.74
167
<0.1
<0.08
<0.025
0.69
0.19
AB-16D
Bedrock
11/08/2018
7.1
5.91
18
324
0.40
-60
145
2.7
145
145
<0.1
0.73j
<2.5
<50
26.1
3.4
433
25.1
226
<100
<0.5
0.91
192
0.013j
<0.08
<0.025
0.63 B,SI
0.33
AB-16DU
Saprolite
08/09/2018
6.0
7.38
30
329
0.20
9
214
3.1
143
143
<0.1
0.92 j
<2.6
<50
25.4
8.3
702
18.3
225
168
0.22 j
0.37 B,SI
183
<0.1
<0.08
0.033
1.2 S1
22.3
AB-16DU
Saprolite
11/08/2018
6.1
6.42
18
315
0.20
3
208
9.5
156
156
<0.1
0.92 j
4.8
<50
27.2
7.8
846
17.9
230
679
<0.5
1.4
189
0.11
<0.08
<0.025
2 BC,SI
12.2
AB-16S
Saprolite
02/08/2018
6.3
4.91
12
352
0.10
-38
167
9.5
103
103
<0.1
31.3
28.4
64 SI
14.1
2.3
302
20.5
167 SI
<100
<0.5
4.2
90.9
<0.1
<0.08
<1.2 D3
<0.5
12.8
AB-16S
Saprolite
05/10/2018
6.4
5.11
21
375
0.15
271
476
9.8
114
114
<0.1
5.2
29.2
35.3j
12.8
2.1
302
19.6
156
<100
<0.5
7 SI
96.6
<0.1
<0.08
0.027 SI
0.62 S1
33.7
AB-16S
Saprolite
08/08/2018
6.2
5.78
34
384
0.20
-83
122
9.8
106
106
<0.1
6.6
45.3
166
14.8
2.6
291
20.8
155
52.6j
<0.5
11.1
120
0.043j
<0.08
<0.025
0.51
6.4
AB-16S
Saprolite
11/08/2018
6.3
5.10
20
400
0.20
-64
141
8.5
164 M1
164
<0.1
5.4
28.7
132
15.9
2.3
315
23.7
237
<100
NA
NA
121
NA
NA
0.031
NA
NA
AB-17D
Bedrock
02/12/2018
6.6
12.65
17
105
3.30
118
323
1.3
54.8
54.8
<0.1
<1
<2.5
<50
8.89
1.1
SOS
<1
91
<100
<0.5
0.16
26.5
<0.1
<0.08
1.1
1.6 S1
0.12
AB-17D
Bedrock
05/10/2018
6.6
12.87
22
103
3.00
86
291
1.0
47.5
47.5
<0.1
<1
<2.5
<50
8.81
1.1
108
0.56 j
91
<100
<0.5
0.16 S1
25.2
<0.1
<0.08
1.1
1.2 S1
0.089 j
AB-17D
Bedrock
08/07/2018
6.6
13.19
21
107
2.80
57
262
0.9
55
55
<0.1
<1
<2.5
<50
9.5
1.2
114
0.6 j
91
<100
<0.5
<0.1
27.4
<0.1
<0.08
0.58 S1
1.2 B,SI
0.11 SI
AB-17D
Bedrock
11/06/2018
6.6
13.19
18
115
3.60
-4
201
1.3
53.4
53.4
<0.1
<1
<2.5
<50
8.82
1.2
106
0.55 j
84
<100
<0.5
0.22
24.8
<0.1
<0.08
1.2
1.5 Sl
0.13
AB-17S
Ash Pore Water
02/12/2018
6.6
13.10
17
1357
0.30
-66
139
9.7
139
139
<0.1
1.1
52.6
18600
105
12.3
1840
394 M6
972
<100
<0.5
318
63.1
0.12
<0.08
<1.2 D3
<0.5
1.3
AB-17S
Ash Pore Water
05/10/2018
6.5
13.35
21
1811
0.30
-93
112
9.5
162
162
<0.1
1.2
87
27600
135 MI
14.7
2440
653
1350
113
<0.5
412
41.6
0.12
<0.08
<0.025
0.43 j,S1
0.92
AB-17S
Ash Pore Water
08/07/2018
6.6
13.56
22
1673
0.20
-138
67
9.5
205
205
<0.1
0.95j
45.9
22100
118
15
2310
610
1230
183
<0.5
365
41.2
0.13
<0.08
<0.025
1.4 S1
0.71
AB-17S
Ash Pore Water
11/06/2018
6.5
14.50
19
1510
0.20
-105
100
9.2
246
246
<0.1
0.68j
57.9
22500
113
14.1
2000
423
1130
307
<0.5
407
52
0.11
<0.08
<0.025
0.68 B,SI
0.67
AB-18D
Bedrock
02/12/2018
6.3
5.81
16
123
1.20
221
426
1.5
58.6
58.6
<0.1
<1
<2.5
<50
11.6
1.6
174
4.2
103
<100
<0.5
0.29
37.8
<0.1
<0.08
0.14
0.98 S1
0.11
AB-18D
Bedrock
05/10/2018
6.3
5.92
27
127
0.40
77
282
1.2
56.1
56.1
<0.1
<1
<2.6
<50
11
1.7
185
5
81
57.8j
<0.5
0.36 S1
36
<0.1
0.042j
0.12 S1
0.31 j,S1
0.11
AB-18D
Bedrock
08/08/2018
6.3
5.89
24
128
0.80
-338
-133
2.1
55.6
55.6
<0.1
<1
<2.5
<50
12.5
1.7
196
4.8
109
71.3 j
<0.5
0.31
37.6
<0.1
0.06 j
0.18 M1
0.44 j
0.11
AB-18D
Bedrock
11/08/2018
6.2
8.96
17
125
0.20
-2
203
1.5
61.6
61.6
<0.1
<1
<2.5
<50
11.6
1.8
186
5.3
102
<100
<0.5
0.41
37.6
0.019 j
<0.08
0.25
0.49 j,B,Sl
0.086 j
AB-18DU
Transition Zone
08/13/2018
6.3
7.56
18
185
0.20
-94
111
0.8
72.7
72.7
<0.1
0.65 j
5.3
<50
8.19
2.1
149
1.5
118
<100
<0.5
2.8
89.2
<0.1
<0.08
<0.025
0.29 j,SI
5.8
AB-18DU
Transition Zone
11/08/2018
6.5
8.80
16
149
0.40
-74
131
8.9
71.8
71.8
<0.1
0.57 j
2.8
<50
8.52
1.6
133
0.69 j
125
267
0.1 j
2.8
92.9
0.019 j
<0.08
<0.025
0.66 BC,S1
3.8
Page 10 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
Copper
Iron
Lead
Lithium
Magnesium
Manganese
Mercury
Molybdenum
Nickel
Nitrate
+ Nitrite
Potassium
Selenium
Sodium
Thallium
Vanadium
Zinc
Aluminum
(0.45u)
Antimony
(0.45u)
Arsenic
(0.45u)
Barium
(0.45u)
Beryllium
(0.45u)
Boron
(0.45u)
Cadmium
(0.45u)
Chromium
(0.45u)
Cobalt
(0.45u)
Copper
(0.45u)
Iron
(0.45u)
Reporting Units
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
mg-N/L
mg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
1000
300
15
NE
NE
50
1
NE
100
NE
NE
20
NE
0.2*
0.3*
1000
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Shallow Unit)
3.8
744
0.3
NE
1.8
75.3
0.2
0.5
9.9
2.7
5
0.5
9.1
0.1
5.6
19.2
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Deep Unit)
2.8
272
0.1
NE
14.4
141
0.2
3.2
7.5
1.4
7.8
0.5
29.2
0.1
3.8
17
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Bedrock Unit)
4.2
792
0.2
NE
13.2
26.6
0.2
3
7.2
1 0.4
9.8
0.5
14
1 0.1
16
11.9
NE
NE
NE
NE
NE
NE
NE
I NE
I NE
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
AB-13S
Ash Pore Water
08/07/2018
0.11 j,B
3500
<0.1
57
16.2
242
<0.2
47.9
6.5
0.014 j
7.62
0.65
5.69
0.85
8.5
5 j,B,SI
<100
18.7
548
264
<0.1
877
0.1
<0.5
4.4
0.36 j,S1
2850
AB-13S
Ash Pore Water
11/07/2018
0.26 j,S1
3120
<0.1
61.4
17.7
221
<0.2
47.1
8
<0.02
7.55
6.3
5.35
0.99
10.9
5.1 j
<100
17.7
552
245
<0.1
828
0.11
0.33 j,B,SI
4.7
0.26 j,B,BC,SI
2760
AB-14D
Transition Zone
02/09/2018
3 SI
<50
<0.1
3.3
5.11
<5
<0.2
<0.5
1 sl
0.15
<5
0.61
8.63
<0.1
1.3
<10
<100
<0.5
0.12
180
<0.1
397
<0.08
2.5 SI
<0.1
2.9
<50
AB-14D
Transition Zone
05/10/2018
3.4
72 SI
0.062 j
2.4
5.71
8.6
<0.2
<0.5
0.86
0.15
<5
0.62
8.54
<0.1
1.3
<10
<100
<0.5
0.24
166
<0.1
378
0.036 j
2.5
0.034 j
3 Sl
<50
AB-14D
Transition Zone
08/08/2018
0.11 j,S1
47.4 j
<0.1
6.2
6.14
6
<0.2
1.2
<0.5
0.16
<5
<0.5
9.58
<0.1
<0.3
5.4 j,B
<100
<0.5
0.077 j,S1
160
0.042 j
383
0.052 j
2.2 SI
0.041 j
2.8
<50
AB-14D
Transition Zone
11/12/2018
2.9
42 j
<0.1
1.4 j,B,SI
6.25
4.9 j
<0.2
<0.5
0.65
0.18
2.58 j
0.8
9.4
<0.1
1.3
<10
<100
<0.5
0.041 j
166
0.024 j
434
<0.08
2.3
0.043 j
3.1 BC,S1
<50
AB-14DU
Saprolite
08/13/2018
1.4 SI
982
0.059 j,B
2.3
2.68
153
<0.2 M1,R1
1.2
20.8
0.035
<5
0.32 j
9.31
<0.1
1.1 SS
4.5 j,B
<100
0.3 j
0.12
80.6
0.043 j
52.6
0.034 j
5.3
1.2
0.35 j,B
147
AB-14DU
Saprolite
11/12/2018
0.37 j,S1
406
<0.1
2.4 j,51
3.08
263
<0.2
0.28 j
0.55
0.1
<5
<0.5
10.1
<0.1
2
31.6
<100
<0.5
0.13
108
<0.1
103
<0.08
1.3
1
0.25 j,BC,S1
126 SI
AB-14S
Ash Pore Water
02/09/2018
<0.5
53100
<0.1
2140
157
12500
0.2 SI
3.5
<0.5
0.038
71
0.94
98.1
<0.1
5
<10
<100
<0.5
784
39.4
0.14
14500
<0.08
<0.5
0.13
<0.5
52200
AB-14S
Ash Pore Water
05/10/2018
0.12 j,S1
37300
0.043j
1640
120
8610
<0.2
4.1
0.22j
0.039
55.2
0.58
69
<0.1
7.8
2.7j
<100
0.19j
906
29.4
0.047j
11400
<0.08
<0.5
0.045j
<0.5
34800
AB-14S
Ash Pore Water
08/08/2018
0.36 j,S1
30600
0.054 j
1150
87.8
6980
<0.2
4.8
0.26 j
0.048
40.8
0.34 j
42.6
<0.1
3.9
2.6 j,B
70.6 j,S1
0.11 j
726
29.2
<0.1
5580
<0.08
0.28 j,S1
0.066 j
0.18 j,S1
28100
AB-14S
Ash Pore Water
11/12/2018
12.1
40600
0.35
1210
117
$930
<0.2
3.9
<0.5
<0.02
49.2
1.1
61.3
0.021j
6.7
<10
<100
3.1
635
69.8
0.022j
7450
<0.08
0.15j
0.12
<0.5 BC
32100
AB-15BR
Bedrock
02/07/2018
<0.5
2540
<0.1
5.4
7.96
276
<0.2 M1
1.1
<0.5
<0.02
<5
<0.5
11.8
<0.1
<0.3
<10
<100
<0.5
<0.1
97.8
<0.1
<50
<0.08
<0.5
<0.1
<0.5
2760
AB-15BR
Bedrock
05/10/2018
<0.5
2320
<0.1
5.4
7.58
262
<0.2
IA SI
0.18 j
<0.02
4.17 j
<0.5
10.7
<0.1
<0.3
<10 P8
<100
<0.5
0.063 j
92.4
<0.1
<50
<0.08
<0.5
0.021 j
0.11 j,S1
2260
AB-15BR
Bedrock
08/08/2018
2.9
2410
<0.1
2 SI
7.87
279
<0.2
<0.5
6.6
<0.02
4.49 j
0.73
12.2
<0.1
1.3
2.8 j,B
<100
<0.5
0.081 j,S1
96.1
<0.1
<50
<0.08
<0.5
<0.1
<0.5 B
2310
AB-15BR
Bedrock
11/09/2018
0.12 j
2350
<0.1
4.7
7.97
268
<0.2
1.1
<0.5
<0.02
4.7 j
<0.5
12.4
<0.1
0.083 j
3.7 j
<100
<0.5
0.053 j
109
0.014 j
<50
<0.08
0.17 j,S1
0.031 j
0.33 j,S1
2150
AB-15D
Bedrock
02/07/2018
<0.5
2550
<0.1
5
7.55
264
<0.2
0.74
<0.5
<0.02
<5
<0.5
9.35
<0.1
<0.3
<10
<100
<0.5
0.11
234
<0.1
<50
<0.08
<0.5
<0.1
0.51 SI
2460
AB-15D
Bedrock
05/10/2018
0.93 Sl
2650
<0.1
5
7.95
258
<0.2
0.74S1
2 Sl
<0.02
4.36 j
<0.5
8.66
<0.1
0.11 j,S1
<10 P8
<100
<0.5
0.47S1
219
0.063 j
41.1 j
<0.08
0.34 j
0.051 j
0.12 j,S1
2600
AB-15D
Bedrock
08/08/2018
0.23 j,S1
2600
0.068 j
5.8
8.01
264
<0.2
0.72
0.17 j
<0.02
4.58 j
<0.5
9.55
<0.1
<0.3
2.6 j,B
<100
<0.5
0.095 j,S1
230
0.07 j
30.8 j
<0.08
<0.5
0.021 j
0.12 j,B,SI
2400
AB-15D
Bedrock
11/09/2018
0.64
2610
<0.1
4.4
8.64
265
<0.2
0.84
<0.5
<0.02
4.98 j
<0.5
10.2
<0.1
0.12 j
2.6 j
<100
<0.5
0.062 j
247
0.047 j
34.5 j
<0.08
<0.5
0.034 j
0.28 j,S1
2310
AB-15S
Ash Pore Water
02/07/2018
<2.5 D3
30500
<0.1
539
37.1
3700
<0.2
55.9
<2.5 D3
0.064
15.3
<2.5 D3
14.4
0.13
<1.5 D3
<10
<100
<0.5
2070
488
<0.1
3020
<0.08
<2.5 D3
2.8
<2.5 D3
29500
AB-15S
Ash Pore Water
05/10/2018
0.21 j,S1
18600
<0.1
443
32.4
2520
<0.2
29.1
4.2
0.03
14.6
0.5
12.6
0.91
7.9
2.9 j,B,P8
<100
0.37 j
1890
389
<0.1
2540
0.083
1.7
3
<0.5
17500
AB-15S
Ash Pore Water
08/08/2018
0.21 j,S1
20100
<0.1
479
34.3
3030
<0.2
22.5
0.9
<0.02 M1
13.8
0.15 j
13.5
0.094 j
0.94
3.6 j,B
56.9 j,Sl
<0.5
965
395
<0.1
2730
<0.08
<0.5
4
<0.5
17300
AB-15S
Ash Pore Water
11/09/2018
0. 13j
30200
<0.1
342
34
3520
<0.2
54.1
1.9
<0.02
14.3
<0.5
12
0.13
1
3.9j
<100
<0.5
2270
492
<0.1
2720
<0.08
<0.5
3.3
0.2 j,S1
28400
AB-15SL
Ash Pore Water
02/07/2018
<0.5
17600
<0.1
169
24.9
1770
<0.2
25.3
0.55 S1
0.051
7.98
<0.5
13.3
<0.1
0.58
<10
<100
<0.5
1160
606
<0.1
1900
<0.08
<0.5
3.2
<0.5
15800
AB-15SL
Ash Pore Water
05/10/2018
<0.5
16100
0.041j
143
21.9
1980
<0.2
20.1
0.62
0.025
7
<0.5
11.8
0.05j
0.62 S1
<10 P8
<100
<0.5
1040
488
<0.1
1540
<0.08
0.16j
4.7
<0.5
14800
AB-15SL
Ash Pore Water
08/08/2018
0.14 j,S1
17300
0.041 j
143
20.1
1980
<0.2
17.1
0.53
0.037
6.7
<0.5
12.2
0.047 j
0.79
3.1 j,B
56 j,S1
<0.5
2060
526
<0.1
1540
<0.08
<0.5
1.2
<0.5
15800
AB-15SL
Ash Pore Water
11/09/2018
0.61
16000
0.12
91.5
18.1
2380
<0.2
15.9
1.1
<0.02
6.1
<0.5
11.6
0.057 j
0.7
<10
<100
<0.5
643
443
<0.1
1270
<0.08
0.16 j,S1
6.4
0.21 j,S1
14600
AB-16D
Bedrock
02/08/2018
IA Sl
1030
<0.1
8.7
6.7
145
<0.2
IA Sl
2.5
0.081
<5
<0.5
18.9
<0.1
<0.3
<10
<100
<0.5
0.69
182
<0.1
<50
<0.08
<0.5
0.21
<0.5
1310
AB-16D
Bedrock
05/10/2018
0.19 j,S1
1960
<0.1
16.7
6.46
243
<0.2
0.8 S1
1
0.024
10.1
<0.5
18.3
<0.1
0.084 j,S1
<10
<100
<0.5
0.72
104
<0.1
<50
<0.08
0.96
0.12
0.36 j,S1
715
AB-16D
Bedrock
08/08/2018
0.6 S1
1500
<0.1
39.4
6.68
173
<0.2
0.95
1.4
0.08
23.4
<0.5
19.8
<0.1
<0.3
4.3 j,B
<100
<0.5
0.59 S1
147
<0.1
<50
<0.08
0.34 j,S1
0.17
0.27 j,B,SI
1210
AB-16D
Bedrock
11/08/2018
1.6 S1
1070 BC
<0.1
26.3
6.58
244
<0.2
1.3
2.3
<0.02
14.9
<0.5
20.4
<0.1
0.31 S3
6.7 j,B
<100
<0.5
0.52
170
<0.1
<50
<0.08
<0.5
0.31
0.2 j,S1
659
AB-16DU
Saprolite
08/09/2018
0.22 j
294
0.066 j
5.8
12.8
748
<0.2
2.2
8.6
<0.02
<5
<0.5
20.4
0.047 j
1.3
4.4 j,B,SI
<100
0.2 j
0.34 S1
181
0.054 j,S1
<50
<0.08
0.42 SI
21.9
0.33 j,S1
90.4
AB-16DU
Saprolite
11/08/2018
1.2 Sl
3360 BC
0.49
6.2
13.5
941
<0.2
2.5
6.1
<0.02
3.73 j
<0.5
17.1
0.029 j
3.7
4.8 j,B
<100
<0.5
0.95
156
0.067 j
<50
<0.08
0.26 j,S1
12.6
<0.5
2560
AB-16S
Saprolite
02/08/2018
0.66 SI
60300
<0.1
<0.5
12.6
1870
<0.2
<0.5
2.6
0.058
<5
0.99
<5
<0.1
0.6 SS
<10
<100
<0.5
4
84.8
<0.1
<50
<0.08
<0.5
12.1
0.51 SS
54600
AB-16S
Saprolite
05/10/2018
0.9 sl
54200
0.029 j
0.4 j,Sl
12.5
2180
<0.2
0.47 j,S1
7.1
0.047
2.81 j
0.23 j
3.74 j
<0.1
0.63 S3
3.4 j,B
<100
<0.5
6.4
87.1
<0.1
39.3 j
<0.08
0.28 j
33.6
0.22 j,S1
50500
AB-16S
Saprolite
08/08/2018
0.56 Sl
63000
0.099 j
0.94 SI
11
1720
<0.2
0.62
1.3
0.065
4.67 j
0.49 j
3.93 j
<0.1
0.98
4.1 j,B
<100
<0.5
10.6
106
<0.1
147
<0.08
0.48 j,S1
6.5
0.16 j,B,SI
56500
AB-16S
Saprolite
11/08/2018
NA
66100 M1
NA
0.34j
13.4
1990
<0.2
NA
NA
<0.02
4.06j
NA
4.19j
NA
NA
3.3 j,B
<100
<0.5
7.6
104
0.014j
188
<0.08
0.36 j,S1
11.2
0.14 j,S1
61600
AB-17D
Bedrock
02/12/2018
0.6 B,S1
<50
<0.1
4.6
3.58
<5
<0.2
<0.5
2.1 S1
0.072
<5
<0.5
6.83
<0.1
4.8
<10
<100
<0.5
0.1
25.8
<0.1
<50
<0.08
1.5 S1
<0.1
<0.5
<50
AB-17D
Bedrock
05/10/2018
0.6 51
<50
0.033 j
4.9
3.34
6.1
<0.2
0.23 j,S1
0.36 j
0.079
<5
<0.5
6.81
<0.1
4.5
27.4
<100
<0.5
0.12
24.4
<0.1
<50
<0.08
1.5
0.052 j
0.97 SI
<50
AB-17D
Bedrock
08/07/2018
0.35 j,B
<50
<0.1
5.7
3.51
4.2 j,S1
<0.2
0.31 j
0.95 B
0.066
2.63 j
<0.5
7.26
<0.1
4.4
3.8 j,SI
<100
<0.5
0.14
24.4
<0.1
<50
<0.08
1.2
0.048 j
0.47 j,S1
<50
AB-17D
Bedrock
11/06/2018
0.69 S1
<50
<0.1
4.8
3.29
3.3 j
<0.2
0.34 j
<0.5
0.061
<5
<0.5
6.75
<0.1
4.4
3.3 j
<100
<0.5
0.11 BC
230
0.093 j
<50
0.057 j
2.2
0.11
0.91 SI
<50
AB-17S
Ash Pore Water
02/12/2018
<0.5 B
92400
0.13
112
38.1
20700
<0.2
6.1
0.73 Sl
0.033
19.8
0.59
68.5
<0.1
4.5
<10
<100
<0.5
368
60.5
<0.1
17200
<0.08
<0.5
1.6
<0.5
94300
AB-17S
Ash Pore Water
05/10/2018
0.18 j,S1
153000
0.31
104
51.4
27000
<0.2
8
0.44 j
0.045
25.3
0.2 j
95.5
<0.1
5.1
<10
<100
<0.5
421
44.1
0.082 j
25200
<0.08
0.13 j,B
1.2
<0.5
137000
AB-17S
Ash Pore Water
08/07/2018
0.53
125000
0.24
89.7
46.3
24700
<0.2
5.9
1.2
0.047
25.1
0.31j
87.3
<0.1
2.9
5.9 j,S1
<1000 D3
<0.5
336
38.5 j,D3
0.099j
21100
<0.08
0.33j
0.68
0.21 j,S1
120000
AB-17S
Ash Pore Water
11/06/2018
0.35 j,S1
108000
0.51
89.6
42.2
22300
<0.2
6.5
<0.5
<0.02
22.9
<0.5
73.6
<0.1
7.4
3j
<100
<0.5
417
47
0.14
37000 M6
0.059j
0.26 j,B,SI
0.64
0.19 j,S1
90500 M1
AB-18D
Bedrock
02/12/2018
<0.5 B
64 SI
<0.1
3.9
3.02
92.8
<0.2
1
2.7 SI
0.046
<5
<0.5
8.77
<0.1
2.7
<10
<100
<0.5
0.27
36.6
<0.1
<50
<0.08
0.51 S1
0.1
<0.5
<50
AB-18D
Bedrock
05/10/2018
0.76 SI
51.9 sl
0.042 j
3.8
2.88
81.6
<0.2
1 S1
1.7
0.05
<5
0.18 j
8.04
<0.1
2.8
41.4
<100
<0.5
0.32
33.9
<0.1
<50
0.039 j
0.28 j
0.087 j
0.22 j,S1
80.8
AB-18D
Bedrock
08/08/2018
0.31 j,S1
84 SI
<0.1
4.7
3.13
77.2
<0.2
1.3 S1
1.5
0.048
<5
0.2 j
9.52
<0.1
2.8
3.4 j,B
74.5 j,S1
<0.5
0.28 S1
32.3
<0.1
<50
0.056 j
0.34 j,S1
0.095 j
0.36 j,B,SI
<50
AB-18D
Bedrock
11/08/2018
1.1 s1
49.3 j,B,BC
<0.1
3.9 B
2.98
52.7
<0.2
0.74
2.1
0.053
<5
<0.5
8.88
<0.1
2.9
4.4 j,B
<100
<0.5
0.23
32
<0.1
<50
<0.08
0.4 j,S1
0.055 j
0.56 SI
<50
AB-18DU
Transition Zone
08/13/2018
0.17 j,B,SI
22100
<0.1
0.9 B
4.63
2170
<0.2
1.1
0.67 SI
0.04
<5
<0.5
7.18
<0.1
0.24 j,B,SI
<10
<100
0.087 j
2.9
83.8
<0.1
<50
<0.08
0.16 j
5.9
0.46 j,B
19500
AB-18DU
Transition Zone
11/08/2018
0.72 Sl
16100 BC
0.19
1.8 j,B
2.73
1470
<0.2
1.3
0.67
<0.02
<5
<0.5
7.53
<0.1
1
2.9 j,B
<100
<0.5
2.5
79.4
<0.1
<50
<0.08
0.23 j,S1
3.8
0.29 j,S1
15500
Page 11 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
RADIONUCLIDES
OTHER PARAMETERS
Lead
(0.45u)
Manganese
(0.45u)
Mercury
(0.45u)
Molybdenum
(0.45u)
Nickel
(0.45u)
Phosphorus
(0.45u)
Selenium
(0.45u)
Silver
(0.45u)
Strontium
(0.45u)
Thallium
(0.45u)
Vanadium
(0.45u)
Zinc
(0.45u)
Radium-226
Radium-228
Total
Radium
Uranium-238
Total
Uranium
Uranium-238
DIS
Carbonate
Alkalinity
Fluoride
Phosphorus
Reporting Units
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pCi/L
pCi/L
pCi/L
ug/mL
ug/mL
ug/mL
mg/L
mg/L
mg/L
15A NCAC 02L Standard
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5A
NE
0.03A
NE
NE
2
NE
Background Threshold Values (Shallow Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
3
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Deep Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
2.8
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Bedrock Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5.7
NE
0.0005
NE
5
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
AB-13S
Ash Pore Water
08/07/2018
<0.1
239
<0.2
48.1
6.9
0.45
0.65
NA
2690
0.83
8.1
4.6 j,B
NA
NA
NA
NA
NA
NA
<5
0.18
0.52
AB-13S
Ash Pore Water
11/07/2018
<0.1
210
<0.2
45.8
7.8
0.37
5.9
NA
2890
0.89
9.6
3.5 j,S1
NA
NA
NA
NA
NA
NA
<5
0.16
0.38
AB-14D
Transition Zone
02/09/2018
<0.1
8.2
<0.2
<0.5
0.94 SI
0.081
0.5
NA
479
<0.1
1.5
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.075
AB-14D
Transition Zone
05/10/2018
0.082j
6.2
<0.2
<0.5
0.68 SI
0.065
0.64
NA
474
<0.1
1.3
<10
NA
NA
NA
NA
NA
NA
<5
0.055 j,M1
0.069
AB-14D
Transition Zone
08/08/2018
<0.1
4.1 j
<0.2
<0.5
8.5
0.11
0.65 SI
NA
480
<0.1
1.5
2.6 j
NA
NA
NA
NA
NA
NA
<5
0.051 j
0.092
AB-14D
Transition Zone
11/12/2018
<0.1
4.5 j
<0.2
0.14 j,B
0.81
0.083
0.79
NA
496
<0.1
1.2
6 j
NA
NA
NA
NA
NA
NA
<5
0.051 j
0.089
AB-14DU
Saprolite
08/13/2018
<0.1
118
<0.2
0.74 B
9.2
0.098
0.27 j
NA
196
<0.1
1
<10
0.0731 U
-0.306 U
0.0731 U
<0.0005
<0.0005
<0.0005
<5
0.057 j
0.068
AB-14DU
Saprolite
11/12/2018
<0.1
230
<0.2
0.27 j,B
0.55
0.11
<0.5
NA
229
<0.1
1.4
3.5 j
0.797 U
0.513 U
1.31 U
NA
<0.0005
NA
<5
0.066 j
0.11
AB-14S
Ash Pore Water
02/09/2018
<0.1
11600
<0.2
3.8
<0.5
0.17
<0.5
NA
4020
<0.1
2.1
<10
NA
NA
NA
NA
NA
NA
<5
0.36
0.19
AB-14S
Ash Pore Water
05/10/2018
<0.1
8110
<0.2
4.3
0.88 sl
0.16
0.39 j
NA
3030
<0.1
2.2
<10
NA
NA
NA
NA
NA
NA
<5
0.44
0.2
AB-14S
Ash Pore Water
08/08/2018
<0.1
6410
<0.2
4.6
0.19 j,S1
0.36
0.6 Sl
NA
2180
<0.1
1.6
<10
NA
NA
NA
NA
NA
NA
<5
0.37
0.34
AB-14S
Ash Pore Water
11/12/2018
<0.1
7080
<0.2
7.1
3
0.17
14.5
NA
2910
0.37
35.2
<10
NA
NA
NA
NA
NA
NA
<5
0.36
0.19
AB-15BR
Bedrock
02/07/2018
<0.1
272
<0.2
1.2
<0.5
<0.05
<0.5
NA
970
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.26
<0.05
AB-15BR
Bedrock
05/10/2018
<0.1
247
<0.2
1.1
0.5 s1
<0.05
<0.5
NA
911
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.32
<0.05
AB-15BR
Bedrock
08/08/2018
<0.1
253
<0.2
1.1 sl
0.11 j,S1
<0.05
<0.5
NA
934
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.31
<0.05
AB-15BR
Bedrock
11/09/2018
0.51
258
<0.2
1.1
0.56
<0.05
<0.5
NA
976
<0.1
<0.3
9.6 j,S1
NA
NA
NA
NA
NA
NA
<5
0.27
<0.05
AB-15D
Bedrock
02/07/2018
<0.1
251
<0.2
0.76
<0.5
<0.05
<0.5
NA
608
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.15
<0.05
AB-15D
Bedrock
05/10/2018
<0.1
236
<0.2
0.66
0.28 j,S1
<0.05
<0.5
NA
543
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.17
0.032 j
AB-15D
Bedrock
08/08/2018
<0.1
242
<0.2
0.7 Sl
0.11 j,S1
<0.05
<0.5
NA
600
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.2
<0.05
AB-15D
Bedrock
11/09/2018
<0.1
244
<0.2
0.68
<0.5
<0.05
<0.5
NA
608
<0.1
<0.3
6.7 j,S1
NA
NA
NA
NA
NA
NA
<5
0.17
<0.05
AB-15S
Ash Pore Water
02/07/2018
<0.1
3440
<0.2
55.9
<2.5 D3
0.62
<2.5 D3
NA
4800
0.12
<1.5 D3
<10
NA
NA
NA
NA
NA
NA
<5
0.41
0.76
AB-15S
Ash Pore Water
05/10/2018
<0.1
2370
<0.2
31.5
5.4
0.55
0.47j
NA
3900
0.85
7
<10
NA
NA
NA
NA
NA
NA
<5
0.51
0.55 M1
AB-15S
Ash Pore Water
08/08/2018
<0.1
2690
<0.2
19.5
0.45 j,S1
1.2
<0.5
NA
3770
0.031 j
0.65
<10
NA
NA
NA
NA
NA
NA
<5
0.63
1.1
AB-15S
Ash Pore Water
11/09/2018
<0.1
3380
<0.2
49.4
2
0.6
<0.5
NA
4320
0.15 sl
0.94
<10
NA
NA
NA
NA
NA
NA
<5
0.49
0.6
AB-15SL
Ash Pore Water
02/07/2018
<0.1
1410
<0.2
27.4
0.53
0.32
<0.5
NA
2960
<0.1
0.56
<10
NA
NA
NA
NA
NA
NA
<5
0.72
0.32
AB-15SL
Ash Pore Water
05/10/2018
<0.1
1650
<0.2
22.9
0.53 sl
0.23
<0.5
NA
2300
0.043j
0.59
<10
NA
NA
NA
NA
NA
NA
<5
0.69
0.2
AB-15SL
Ash Pore Water
08/08/2018
<0.1
1670
<0.2
22.5
0.76 SI
0.5
0.15 j,S1
NA
2300
0.073j
0.94
<10
NA
NA
NA
NA
NA
NA
<5
0.73
0.38
AB-15SL
Ash Pore Water
11/09/2018
<0.1
2070
<0.2
16.2
1.2
0.16
<0.5
NA
1900
0.034 j
0.39
<10
NA
NA
NA
NA
NA
NA
<5
0.5
0.14
AB-16D
Bedrock
02/08/2018
<0.1
173
<0.2
1
1.9
<0.05
<0.5
NA
368
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.25
<0.05
AB-16D
Bedrock
05/10/2018
<0.1
85.7
<0.2
1.2
IA SI
<0.05
<0.5
NA
298
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.28
<0.05
AB-16D
Bedrock
08/08/2018
<0.1
154
<0.2
1.2 Sl
1.2 S1
0.032j
<0.5
NA
344
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.28
0.028j
AB-16D
Bedrock
11/08/2018
<0.1
229
<0.2
1.1
2.4
<0.05
<0.5
NA
384
<0.1
0.19 j
4 j
NA
NA
NA
NA
NA
NA
<5
0.27
<0.05
AB-16DU
Saprolite
08/09/2018
0.079j
679
<0.2
2.3
8.6
0.13
<0.5
NA
683
0.044j
1.3
2.8j
0.328 U
0.359 U
0.687 U
0.00017j
0.00017j
0.00016j
<5
0.19
0.13
AB-16DU
Saprolite
11/08/2018
<0.1
765
<0.2
2.1
5
0.18
<0.5
NA
724
<0.1
0.5
<10
0.351 U
0.278 U
0.629 U
NA
0.00018 j
NA
<5
0.2
0.19
AB-16S
Saprolite
02/08/2018
<0.1
1740
<0.2
<0.5
2.4
<0.05
0.92
NA
272
<0.1
0.67
<10
NA
NA
NA
NA
NA
NA
<5
0.28
<0.05
AB-16S
Saprolite
05/10/2018
<0.1
2050
<0.2
0.47j
7
<0.05
0.22j
NA
270
<0.1
0.57
2.8j
NA
NA
NA
NA
NA
NA
<5
0.29
0.03j
AB-16S
Saprolite
08/08/2018
<0.1
1560
<0.2
0.64 S1
1.2 SI
<0.05
0.43 j,S1
NA
266
<0.1
0.87
<10
NA
NA
NA
NA
NA
NA
<5
0.31
0.029 j
AB-16S
Saprolite
11/08/2018
<0.1
1840
<0.2
0.63
2.9
0.043 j
<0.5
NA
284
<0.1
0.69
<10
NA
NA
NA
NA
NA
NA
<5
0.29
0.065
AB-17D
Bedrock
02/12/2018
<0.1
<5
<0.2
<0.5
1.3 Sl
0.074
<0.5
NA
103
<0.1
4.8
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.078
AB-17D
Bedrock
05/10/2018
<0.1
2.8 j
<0.2 R1
0.26 j
0.34 j,S1
0.061
<0.5
NA
102
<0.1
4.8
26
NA
NA
NA
NA
NA
NA
<5
0.055 j
0.066
AB-17D
Bedrock
08/07/2018
<0.1
<5
<0.2
0.28 j
0.78
0.065
<0.5
NA
98
<0.1
4.8
<10
NA
NA
NA
NA
NA
NA
<5
0.064 j
0.058
AB-17D
Bedrock
11/06/2018
0.18
24.5
<0.2
0.78
0.7
0.073
0.5 j
NA
1030
0.086 j
1.7
4.7 j
NA
NA
NA
NA
NA
NA
<5
0.062 j
0.075
AB-17S
Ash Pore Water
02/12/2018
<0.1
19200
<0.2
5.7
1.1 sl
0.066
0.6
NA
1900
<0.1
2.7
<10
NA
NA
NA
NA
NA
NA
<5
0.19 M1
0.088
AB-17S
Ash Pore Water
05/10/2018
<0.1
24300
<0.2
8
0.36 j,B,Sl
0.054
0.46 j
NA
2260
<0.1
1.9
2.5 j
NA
NA
NA
NA
NA
NA
<5
0.25
0.1
AB-17S
Ash Pore Water
08/07/2018
0.077j
23700
<0.2
5.8
0.96
0.12
0.35j
NA
1980
<0.1
2.3
<100 D3
NA
NA
NA
NA
NA
NA
<5
0.28
0.11
AB-17S
Ash Pore Water
11/06/2018
0.38
37400 M6
<0.2 M1
6.4
0.73
0.085
0.81
NA
1800
0.056j
2.9
3j
NA
NA
NA
NA
NA
NA
<5
0.25
0.099
AB-18D
Bedrock
02/12/2018
<0.1
89.2
<0.2
1.1
2.3 S1
0.071
<0.5
NA
179
<0.1
2.8
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.076
AB-18D
Bedrock
05/10/2018
<0.1
80.4
<0.2
0.95
2 SI
0.058
<0.5
NA
174
<0.1
2.7
37
NA
NA
NA
NA
NA
NA
<5
0.085j
0.066
AB-18D
Bedrock
08/08/2018
<0.1
66.8
<0.2
0.96 SI
1.6 SI
0.063 S1
0.2 j,S1
NA
169
0.033 j
2.8
6.5 j,B
NA
NA
NA
NA
NA
NA
<5
0.077 j
0.074
AB-18D
Bedrock
11/08/2018
<0.1
43
<0.2
0.65
1.7
0.073
<0.5
NA
162
<0.1
2.6
<10
NA
NA
NA
NA
NA
NA
<5
0.082j
0.074
AB-18DU
Transition Zone
1 08/13/2018
<0.1
1970
<0.2
1.1
0.79
0.34
<0.5
NA
134
<0.1
0.14j
<10
0.253 U
0.856 U
1.11 U
<0.0005
<0.0005
1 <0.0005
<5
0.11
0.32
AB-18131.1
Transition Zone
11/08/2018
<0.1
1420
<0.2
1.2
0.88
0.41
<0.5
NA
122
<0.1
0.13j
I <10
0.266 U
0.747
1.01 U
NA
<0.0005
NA
<5
0.08j
0.44
Page 12 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
FIELD PARAMETERS
WATER QUALITY PARAMETERS
SELECTED 40CFR257 APPENDIX III CONSTITUENTS plus Sr
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
PH
Water
Level
Temp
Spec
Cond
DO
ORP
Eh
Turbidity
Alkalinity
Bi-
carbonate
Alkalinity
Sulfide
Total
Organic
Carbon
Total
Suspended
Solids
Boron
Calcium
Chloride
Strontium
Sulfate
Total
Dissolved
Solids
Aluminum
Antimony
Arsenic
Barium
Beryllium
Cadmium
Chromium
(VI)
Chromium
Cobalt
Reporting Units
S.U.
ft
Deg C
Nmhos/cm
mg/L
mV
mV
NTUs
mg/L
mg/L
mg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
pg/L
pg/L
Ng/L
pg/L
Ng/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
6.5-8.5
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
700
NE
250
NE
250
Soo
NE
1*
10
700
4*
2
10
10
1*
Background Threshold Values (Shallow Unit)
4.6-6.4
NE
NE
NE
NE
NE
NE
NE
63
63
0.1
1
NE
50
10.7
5.5
303
4.2
140
757
0.5
0.4
310
0.2
0.08
5.7
16.5
1.2
Background Threshold Values (Deep Unit)
5.7-6.9
NE
NE
NE
NE
NE
NE
NE
204
204
0.1
1
NE
50
13.1
4.7
665
17.7
183
128
0.5
0.6
127
0.1
0.08
3
7.6
1.9
Background Threshold Values (Bedrock Unit)
5.6-7.6
NE
NE
NE
NE
NE
I NE
I NE
108
108
0.1
1 1
NE
50
15
1 4.5
1 253
18.4
216
1 300
1 0.5
1 0.6
1 435
1 0.2
t0.08
3.9
1 8.3
2.8
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
AB-18S
Ash Pore Water
02/12/2018
7.0
6.31
17
493
0.30
-83
122
9.5
229
229
<0.1
1.2
21.1
1550
52
5.4
1780
39.9
295
<100
0.64
1070
295
<0.1
<0.08
<0.12 D3
0.9 SI
3.1
AB-18S
Ash Pore Water
05/10/2018
7.1
6.41
26
491
0.60
-119
86
4.5
240
240
0.11
1.5
9.5
2050
45.1
3.9
1710
23.8
245
<100
<0.5
831
224
<0.1
<0.08
<0.025
0.37 j,S1
0.21
AB-18S
Ash Pore Water
08/08/2018
7.0
6.41
25
518
0.50
-412
-207
0.8
240
240
<0.1
0.93j
4.5
2220
59.3
6.1
2040
10.8
313
62.1j
<0.5
441
300
<0.1
<0.08
<0.025
0.34j
0.46
AB-18S
Ash Pore Water
11/08/2018
7.1
8.22
18
631
0.40
-163
42
0.9
314
314
<0.1
1.4
24.1
2120
80.5 M1
6.5
2720
33.9
374
<100
0.9
849 M6
384
0.01j
<0.08
<0.025
0.59 B,S1
0.38
AB-20D
Bedrock
02/12/2018
8.5
65.68
16
198
0.80
-10
195
9.9
85.6
85.6
<0.1
<1
<2.5
<50
23.3
1.6
468
17.4
121
245
<0.5
1.5
59.4
<0.1
<0.08
0.041
1.7 SI
<0.1
AB-20D
Bedrock
05/14/2018
8.4
65.78
30
1016
0.80
-64
141
8.7
73.9
73.9
<0.1
<1
<2.5
<50
22.1
1.7
462
20.4
120
227 SI
0.42j
0.42
46.9
<0.1
<0.08
0.025 S1
1.3 B,S3
0.066j
AB-20D
Bedrock
08/13/2018
8.1
65.63
20
208
0.50
-11
194
9.2
81.1
81.1
<0.1
<1
<2.5
125
23.3
2
503
19.2
135
160
0.62
0.33
55.2
<0.1
<0.08
0.063
0.33 j,S1
0.09j
AB-20D
Bedrock
11/08/2018
8.2
65.56
17
209
0.60
-130
75
1.6
95.5
95.5
<0.1
<1
3.1
129
23.6
2.1
546
18.9
138
51.9j
0.14j
0.25
57.5
<0.1
<0.08
0.028
0.47 j,B,S1
0.059j
AB-20S
Ash Pore Water
02/12/2018
6.8
64.15
16
5448
0.10
183
388
9.7
83.7
83.7
<0.1
<1
1390
67300
456 M6
53.3
7620
2680
4600
594
26.3
42.1
30.1
0.34
11.6
15.6
30.6
391
AB-20S
Ash Pore Water
05/14/2018
6.8
64.18
35
5399
0.50
-54
151
9.7
80.8
80.8
<0.1
1.5
15.7
69400 M6
472
55.8
9050 MI
2700
5260
780
25.8
42.8
42.8
0.28
10.3
<0.025
1.3 B,S1
363
AB-20S
Ash Pore Water
08/13/2018
6.5
64.01
24
5117
0.80
6
211
1.2
86.5
86.5
<0.1
<1
<2.5
78900
464
56.2
8990
2880
5120
328
24.4
38.2
26.2
0.33
11.8
<0.025
1.3 S1
398
AB-20S
Ash Pore Water
11/08/2018
6.3
63.75
17
4942
2.40
481
686
1.0
72.6
72.6
<0.1
<1 M1
<2.6
80600
470
51.8 M6
8780
2680 M6
3910 D6
167j
20
25
25.9
0.38
12.4
<0.025
1.5 B,SI
200 M1
AB-21D
Transition Zone
02/07/2018
6.1
17.68
14
259
0.20
7
212
9.8
109
109
0.11
<1
4.4
<50
17.5
7.9
604
19.2
193
179
<0.5
0.15
191
<0.1
<0.08
<0.025
9.7
1.5
AB-21D
Transition Zone
05/10/2018
6.1
17.05
22
223
0.40
0
205
9.0
79
79
<0.1
<1
3
<50
11.8
14.5 M1
413
9.7 M1
146
530
<0.5
0.087 j,S1
175
<0.1
<0.08
<0.025
0.84 S1
0.32
AB-21D
Transition Zone
08/08/2018
6.1
16.70
24
214
0.96
244
449
2.0
73.2
73.2
<0.1
<1
<2.6
28.3 j
12.5
14.5
404
10.7
166
54.4 j
<0.5
<0.1
167
<0.1
<0.08
<0.025
0.2 j,B
0.25
AB-21D
Transition Zone
11/07/2018
6.0
16.45
19
215
0.50
-29
176
2.6
91.5
91.5
<0.1
<1
<2.5
<50
13.7
12.4
451
16.7
172
<100
<0.5
0.2 SI
175
0.024j
<0.08
<0.025
1.2 SI
0.43
AB-21S
Ash Pore Water
02/07/2018
6.3
19.88
13
2571
0.50
-56
149
9.8
115
115
<0.1
3.5
98.6
3130
69.6
410
1040
325
1240
<100
<0.5
3230
193
<0.1
<0.08
<0.025
3.1 SI
1.4
AB-21S
Ash Pore Water
05/10/2018
6.3
18.75
25
2850
0.20
-102
103
7.5
112
112
<0.1
2.2
194
3560
84.9
SIB
949
361
1510
132
<0.5
4240
44.8
<0.1
<0.08
<0.025 P4,R0
0.74 S1
1.8
AB-21S
Ash Pore Water
08/08/2018
6.1
18.48
21
2831
0.22
128
333
4.9
211 MI
211
<0.1
2.1
117
4280
91.6
497
1400
285
1500
<100
<0.5
3650
118
<0.1
<0.08
<1.2 P4,D3,R0
0.38 j,B
3.9
AB-21S
Ash Pore Water
11/07/2018
6.1
18.31
18
3094
0.20
-111
95
9.7
215
215
<0.1
2.2
86.8
5060
110
599
1370
306
1630
<100
<0.5
4950
55.3
0.018j
<0.08
<0.5 D3
0.77 SI
1.6
AL-OIBR
Bedrock
02/08/2018
6.2
41.30
15
704
0.20
88
293
5.0
63.4
63.4
<0.1
<1
<2.5
609
61.4
157
3480
6.3
418
<100
<0.5
<0.1
391
<0.1
<0.08
0.032 S1
4.6
<0.1
AL-01BR
Bedrock
05/10/2018
6.1
40.94
19
707
0.40
-94
111
2.4
60.7
60.7
<0.1
<1
<2.5
521
57.3
167
2920
7.2
504
<100
<0.5
0.11 SI
339
<0.1
<0.08
0.083 S1
1.5 S1
0.053j
AL-01BR
Bedrock
08/1O/2018
6.2
39.95
20
783
0.30
69
274
7.4
60.1
60.1
<0.1
<1
<2.5
566
63.5
172
3200
7.4
454
<100
<0.5
0.048j
357
<0.1
<0.08
0.1
0.44 j,S1
0.09j
AL-01BR
Bedrock
11/09/2018
6.1
40.61
13
752
0.30
21
226
3.5
66.3
66.3
<0.1
<1
<2.5
633
67.8
178
3460
9.4
481
<100
<0.5
0.089j
392
0.01j
<0.08
0.091 S1
5.3
0.11
AL-01D
Transition Zone
02/08/2018
5.6
44.00
16
1015
0.30
105
310
5.7
17.4
17.4
<0.1
<1
<2.5
3110
212
267
6140
11.9
668
<100
<0.5
<0.1
966
<0.1
<0.08
0.036 SI
3 SI
0.23
AL-011)
Transition Zone
05/10/2018
5.6
43.50
19
1019
0.10
-52
154
2.9
22.2
22.2
<0.1
<1
<2.5
2850
99.4
260
5550
14.8
593
105
<0.5
0.095 j,S1
872
<0.1
0.033j
0.025 S1
2.6 S1
0.2
AL-01D
Transition Zone
08/1O/2018
5.4
43.70
21
1023
0.30
-91
114
2.8
21.1
21.1
<0.1
<1
<2.5
3000
99.8
269
5520
15.7
640
<100
<0.5
<0.1
865
0.052j
0.047j
0.076
0.62 SI
0.3
AL-01D
Transition Zone
11/09/2018
5.6
43.47
12
1009
0.70
89
294
2.8
21.2
21.2
<0.1
<1
<2.6
3340
98.7
276
5910
16.4
546
<100
<0.5
0.1
944
0.022j
0.075j
0.028 S1
2.4
0.34
AL-01S
Saprolite
02/08/2018
4.5
39.03
17
968
0.40
577
782
8.0
<5
<5
<0.1 M1
<1
<2.5
5570
60.5
233
2750
48.7
552
1140
<0.5
0.92
92.3
6.3
0.61
0.15
4.3 S1
7.8
AL-01S
Saprolite
05/10/2018
4.6
38.24
22
876
1.70
569
774
5.7
<5
<5
<0.1
<1
5.2
3720
62.7
180
2100
118
492
1150
<0.5
2.7 S1
60.3
4.5
0.43
0.16 S1
2.6 S1
5.2
AL-01S
Saprolite
08/13/2018
4.7
38.58
19
1022
0.80
480
685
8.9
<5
<5
<0.1 M1
<1
5.1
4520
73.4
236
2470
119
560
1640
<0.5
2.7
73.3
5.2
0.52
0.18
14.6
7.4
AL-01S
Saprolite
11/09/2018
4.7
38.20
15
973
1.20
543
748
8.9
<5
<5
<0.1
<1
5.8
4450
75
218
2150
113
594
1520
<0.5
4.8
63.7
4.3
0.4
0.2 M1,S1
30
6
AL-02BR
Bedrock
02/12/2018
6.6
112.25
17
554
1.30
-99
106
3.8
83.8
83.8
<0.1
<1
<2.5
3220
61.8
<1
2440
191
417
<100
0.62
0.42
144
<0.1
<0.08
1.3
4.4 S1
0.98
AL-02BR
Bedrock
05/14/2018
6.7
112.08
23
648
2.80
-58
147
3.2
95.6
95.6
<0.1
0.83j
<2.5
3760
79.6
0.82j
2800
217
500
<100
0.36j
0.38
140
<0.1
<0.08
0.088 S1
26.3
1.4
AL-02BR
Bedrock
08/1O/2018
7.3
112.08
28
7
1.80
-145
60
2.1
123
123
<0.1
0.57j
<2.5
4180
94.4
0.88j
3240
248
578
61.7j
0.23j
0.56
145
<0.1
<0.08
0.24 M1
0.55 S1
0.35
AL-02BR
Bedrock
11/12/2018
6.7
112.32
14
700
1.00
-30
175
0.3
93.8
93.8
<0.1
<1
<2.5
5370
86
1
3350
282
540
<100
0.11j
0.28
143
0.01j
<0.08
0.57
0.86 B,S1
0.82
AL-02BRL
Bedrock
02/12/2018
7.7
117.36
19
624
0.30
35
240
9.2
NA
NA
NA
NA
NA
2100
NA
NA
NA
179
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
AL-02BRL
Bedrock
04/10/2018
7.5
117.55
20
633
0.79
-6
199
4.1
115
115
<0.1
NA
<2.9
2010
95.8
0.99j
1530
215
477
<100
<0.5
0.18
121
<0.1
0.025j
0.15
0.73
0.021j
AL-02BRL
Bedrock
05/14/2018
8.5
117.42
24
605
0.20
-3
202
2.6
91
91
<0.1
0.75j
5.1
1780
74.8
0.99j
1460
188
413
<100
<0.5
0.24
SOS
<0.1
<0.08
0.12 M1,SI
3.3 S1
0.093j
AL-02BRL
Bedrock
08/10/2018
8.9
117.58
18
658
0.50
-29
176
9.8
92.3
92.3
<0.1
0.68j
29.2
1960
80.7
1
1690
209
447
<100
<0.5
0.14
123
0.04j
<0.08
0.24
1 S1
0.042j
AL-02BRL
Bedrock
11/12/2018
8.4
117.02
15
546
1.30
8
213
2.4
48.9
48.9
<0.1
<1
3
2520
59.2
1.3
1700
225
418
<100
<0.5
0.25
80.7
<0.1
<0.08
1.5
1.9 S1
0.033j
AL-02BRLL
Bedrock
02/12/2018
7.7
118.18
19
1277
0.10
-113
92
7.7
183
183
<0.1
<1
5.4
10500
215
4.5
3560
543
1080
119
<0.5
0.2
73.6
<0.1
<0.08
<0.12 D3
2.6 S1
0.1
AL-02BRLL
Bedrock
04/10/2018
7.3
117.84
18
1260
0.67
-10
195
9.3
180
180
<0.1
NA
21.8
11700
211
4.4
3840
538
1060
1040
<0.5
0.35
102
0.045j
0.074j
<0.025
2.2
0.19
AL-02BRLL
Bedrock
05/15/2018
8.0
117.54
20
1265
0.20
-227
-22
9.4
173
173
<0.1
0.93j
19 D6
10700
194
4.7
3640
529 M6
1060
97j
0.12j
0.21
80.6
<0.1
<0.08
<0.025 MI
0.79 SI
0.048j
AL-02BRLL
Bedrock
08/13/2018
8.3
117.67
22
1247
0.10
-279
-74
7.5
156
156
<0.1
0.69j
21.2
10500 M6
174 M6
5
3730
584
1040
<100
<0.5
0.16
57
<0.1
<0.08
<0.025
0.22 j,B
0.048j
AL-02BRLL
Bedrock
11/12/2018
8.4
117.21
15
1107
0.60
-116
89
9.6
208
208
<0.1
0.73j
46.8
7880
158
3.1
3750
472
854
154
<0.5
0.26
86.5
<0.1
<0.08
<0.025 M1
0.49 j,S1
0.066j
AL-02D
Transition Zone
02/08/2018
5.7
114.24
16
1639
1.80
141
346
8.4
43.2
43.2
<0.1
<1
<2.5
11500
237
2.3
9550
711
1540
104
<0.5
0.29 S1
49.4
<0.1
<0.08
0.79
3.3 51
3.9
AL-02D
Transition Zone
05/14/2018
5.7
113.96
24
1665
1.40
45
250
8.0
41.8
41.8
<0.1
<1
11.2 D6
10400
219
2.3
<5
786
1440
259 S1
0.3j
0.24
52.7
0.046j
0.075j
0.24 P4,R0
2.3 S1
5
AL-02D
Transition Zone
08/1O/2018
5.6
113.97
30
1808
2.50
138
343
7.1
38.6
38.6
<0.1
0.56j
<2.5
11900
257
2.4
10100
1040
1650
308
0.088j
0.19
47.3
<0.1
0.033j
0.48
1.1 SI
2
AL-02D
Transition Zone
11/12/2018
5.8
114.07
13
18
2.30
110
315
7.3
43.7
43.7
<0.1
<1
<2.5
10500
236
2.5
9290
939
1490
137
<0.5
0.19
43.3
0.037j
<0.08
0.38 M1,R1
1.4 S1
3.5
AL-02S
Saprolite
02/08/2018
5.3
115.51
18
2340
2.40
240
1 445
8.5
21.3
21.3
1 <0.1
<1
25.4
12900
370
1.6
1
5620
1160
1 2210 D6
620
<0.5
0.45 S1
50.7
1
0.77
1.8
99.1
1.4
AL-02S
Saprolite
05/14/2018
5.3
115.18
26
2461
2.50
227
1 4321
5.9
1 16.4
1 16.4
1 <0.1
0.66 j
4.8
12500
359 M6
1.8 M1
1 5510
1 1400 M61
2430
1 618
<0.5
0.23
1 47.4
0.98
0.89
1.9
3.8 S1
0.31
Page 13 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
Copper
Iron
Lead
Lithium
Magnesium
Manganese
Mercury
Molybdenum
Nickel
Nitrate
+ Nitrite
Potassium
Selenium
Sodium
Thallium
Vanadium
Zinc
Aluminum
(0.45u)
Antimony
(0.45u)
Arsenic
(0.45u)
Barium
(0.45u)
Beryllium
(0.45u)
Boron
(0.45u)
Cadmium
(0.45u)
Chromium
(0.45u)
Cobalt
(0.45u)
Copper
(0.45u)
Iron
(0.45u)
Reporting Units
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
mg-N/L
mg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
1000
300
15
NE
NE
50
1
NE
100
NE
NE
20
NE
0.2*
0.3*
1000
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Shallow Unit)
3.8
744
0.3
NE
1.8
75.3
0.2
0.5
9.9
2.7
5
0.5
9.1
0.1
5.6
19.2
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Deep Unit)
2.8
272
0.1
NE
14.4
141
0.2
3.2
7.5
1.4
7.8
0.5
29.2
0.1
3.8
17
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Bedrock Unit)
4.2
792
0.2
NE
1 13.2
26.6
0.2
3
7.2
0.4
9.8
0.5
14
1 0.1
16
11.9
NE
I NE
I NE
NE
I NE
I NE
NE
NE
I NE
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
AB-18S
Ash Pore Water
02/12/2018
<0.5 B
9940
<0.1
107
15.1
935
<0.2
135
2.2 SI
<0.02
8.66
14.8
22.5
0.1
3.4
<10
<100
0.59
1020
268
<0.1
1490
<0.08
<0.5
3.1
<0.5
9390
AB-18S
Ash Pore Water
05/10/2018
0.16 j,S1
4170
<0.1
102
13.4
475
<0.2
121
1.9
<0.02
9.6
3
26
<0.1
1.6
14.4 B
<100
<0.5
773
197
<0.1
1840
<0.08
0.24 j
0.22
<0.5
3940
AB-18S
Ash Pore Water
08/08/2018
0.2 j,S1
4060
<0.1
134
17.2
614
<0.2
46.3
2
<0.02
9.12
1.5
16.2
0.041 j
1.6
3 j,B
<100
0.077 j
544
281
0.042 j
2040
<0.08
0.27 j,S1
0.43
<0.5
3940
AB-18S
Ash Pore Water
11/08/2018
0.21 j,S1
13900 BC
<0.1
133
18.8
1280
<0.2
134
2.5
<0.02
11
<0.5
21.6
0.046j
2.5
3j,B
<100
1.2
759
326
<0.1
1910
<0.08
0.16 j,S1
0.3
<0.5
11500
AB-20D
Bedrock
02/12/2018
1.5 SS
320
0.16
1.4
2.29
7.7
<0.2
3.9
0.9 S1
<0.02
<5
<0.5
14.7
<0.1
0.79
<10
<100
<0.5
1.2
54.9
<0.1
<50
<0.08
<0.5
<0.1
<0.5 B
<50
AB-20D
Bedrock
05/14/2018
1 51
263
0.14 B,S1
1.6 SI
2.05
9
<0.2
4.2
0.74
<0.02
4.07 j
<0.5
15.3
<0.1
0.78 S1
5.1 j,S1
99.6 j
0.51
0.41
45.5
<0.1
<50
<0.08
0.16 j,S1
0.021 j
0.16 j,S1
<50
AB-20D
Bedrock
08/13/2018
2.8
267
0.11
1.2 B
2.24
10.7
<0.2
31.7
2.2
0.013 j
4.44 j
<0.5
15.1
<0.1
0.97 B,S1
7.8 j
<100
0.34 j
0.2
52.8
<0.1
<50
<0.08
<0.5
0.034 j
1.3
38.1 j
AB-20D
Bedrock
11/08/2018
1.1 S1
95.5 B,BC
<0.1
1.2 j,B
2.44
11
<0.2
20.4
1.2
<0.02
3.78 j
<0.5
14.6
<0.1
0.4 S1
4.1 j,B
<100
<0.5
0.14
50.7
<0.1
180
<0.08
0.14 j,S1
0.017 j
0.24 j,S1
49.5 j
AB-20S
Ash Pore Water
02/12/2018
2.2 S1
264 SI
0.41
16000
227 M6
6700
<0.2
2390
334
69.9
392 M6
626
293 M6
33.8
124
285
<2000
28.3
40.5
<100
0.19
65600
9.1
19
409
0.78 B,S1
<1000
AB-20S
Ash Pore Water
05/14/2018
1.8 S1
319
0.44 B,S1
15200
225
8370 M1
<0.2 M1
2350
285
66.9
391
580
302
30.5
115
305
71.9j
26.9
45.1
17.7
0.28 j,133
61000
9.1
0.21 j,S1
378
2.9
<50
AB-20S
Ash Pore Water
08/13/2018
2.1
77.7
0.095j
13500
225
7260
<0.2
2170
304
57.2
380
568
287
30.3
115
366
<2000
25.2
48.7
<100
0.27
60400
8.9
2
447
1.6
<1000
AB-20S
Ash Pore Water
11/08/2018
1.5 S1
<50 BC
0.1
8590 M6
193
6290
<0.2
1650 M6
242
45.7
351
481 M6
272
25.8
80.7
418
81.6j
22.4
30.5
19.7
0.31
71300
11.9
0.5 S1
298 M1
1.7 S1
<50
AB-21D
Transition Zone
02/07/2018
1.4 S1
13SO
0.13
10.7
12.7
142
<0.2
1.2
9.6
<0.02
<5
<0.5
11.4
<0.1
0.88
<10
<100
<0.5
0.19
169
<0.1
<50
<0.08
4.6
1.6
<0.5
1040
AB-21D
Transition Zone
05/10/2018
0.76 SI
1580
0.16
12.3
10.4
64.8
<0.2
1.3
2.4
<0.02
5.73
<0.5
8.97
<0.1
0.93
14.2 B
<100
<0.5
0.1
159
<0.1
<50
<0.08
0.24 j
0.42
0.34 j,S1
1170
AB-21D
Transition Zone
08/08/2018
0.24 j,S1
962
0.062 j
14.4
10.7
56.2
<0.2
1.4
1.6
<0.02
6.35
<0.5
9.93
<0.1
0.16 j
9.1 j,B
<100
<0.5
0.074 j,S1
159
<0.1
25.4 j
<0.08
<0.5
0.38
0.12 j,S1
861
AB-21D
Transition Zone
11/07/2018
0.56 SI
878
0.096 j
12.6
11.2
60.1
<0.2
1.3
2.3
<0.02
6.01
<0.5
10.1
<0.1
0.36
4.3 j,B
<100
<0.5
0.2
163
0.015 j
<50
<0.08
0.46 j,B,SI
0.7
0.2 j,S1
771
AB-21S
Ash Pore Water
02/07/2018
1 SS
341000
<0.1
9.3
114
11000
<0.2
1
2.9
0.044
41
<0.5
17.9
<0.1
<0.3
<10
<100
<0.5
3070
309
<0.1
2470
<0.08
<0.5
1.6
<0.5
327000
AB-21S
Ash Pore Water
05/10/2018
0.27 j,S1
378000
0.076j
7.9
124
12900
<0.2
IA S1
2.8
0.026
45
0.21j
17.3
0.082j
0.53 S1
<10 P8
<100
<0.5
3920
35.3
<0.1
3440
<0.08
0.17j
1.8
0.32 j,S1
354000 M1
AB-21S
Ash Pore Water
08/08/2018
0.13 j,S1
298000
<0.1
9.8
137
10900
<0.2
1.2
5.2
0.038
36.7
<0.5
20.1
0.053j
0.095j
<10
<100
<0.5
3470
60.5
<0.1
3950
<0.08
0.17 j,S1
7
<0.5
232000
AB-21S
Ash Pore Water
11/07/2018
0.35 j,S1
351000
<0.1
7.4
158
13800
<0.2
1.2 S1
2.3
<0.02
43.5
<0.5
19.9
0.016 j
0.3 j
<10
<100
<0.5
4380
46.4
0.019 j
4600
<0.08
0.28 j,B,SI
1.5
0.28 j,S1
311000
AL-01BR
Bedrock
02/08/2018
2.1 S1
132
<0.1
19.2
23.8
13.2
<0.2
<0.5
5.1
<0.02
7.01
<0.5
19.5
<0.1
0.98
<10
<100
<0.5
<0.1
329
<0.1
529
<0.08
3
<0.1
1.1 SS
<50
AL-01BR
Bedrock
05/10/2018
0.56 SI
61.5 SI
0.036 j
18.5
23.4
13.6
<0.2
0.098 j,S1
3.5
<0.02
6.48
0.18 j
17.4
<0.1
0.76 S1
<10
<100
<0.5
0.063 j
316
<0.1
506
<0.08
0.44 j
0.032 j
0.36 j,S1
<50
AL-01BR
Bedrock
08/10/2018
0.83 SI
36.9 j
0.055 j
18.9
24.4
11.6
<0.2
0.93
5.3
0.011 j
6.88
0.14 j
19.1
<0.1
0.76
4.7 j,B,SI
<100
<0.5
<0.1
312
<0.1
497
<0.08
0.3 j
0.085 j
1.3 S1
<50
AL-01BR
Bedrock
11/09/2018
1
65.1
<0.1
15.4
25.7
7.1
<0.2
0.59
4.8
0.01 j
7.54
<0.5
20
<0.1
0.82
<10
<100
0.13 j
0.052 j
352
<0.1
569
<0.08
0.25 j,S1
0.05 j
1.2 S1
<50
AL-01D
Transition Zone
02/08/2018
1.5 SS
153
<0.1
12.6
23.8
24.9
<0.2
<0.5
1.9 SS
<0.02
9.07
<0.5
29.3
<0.1
0.89
<10
<100
<0.5
<0.1
847
<0.1
2770
<0.08
1.5
0.2
0.89 SI
<50
AL-01D
Transition Zone
05/10/2018
1.2 S1
133 SI
0.051 j
11.3
23.6
21.9
<0.2
<0.5
2.3
0.091
9.07
<0.5
29.2
<0.1
0.65 Sl
4.6 j
<100
<0.5
0.08 j
830
<0.1
2860
0.032 j
0.49 j
0.18
0.17 j,S1
44.1 j
AL-01D
Transition Zone
08/10/2018
0.99 SI
57.8
0.068 j
12.3
22.9
24.8
<0.2
2.9
4
0.011 j
8.9
<0.5
28.1
<0.1
0.7
11.6 B,S1
<100
<0.5
<0.1
774
<0.1
2690
0.058 j
0.28 j
0.19
0.86 SI
<50
AL-01D
Transition Zone
11/09/2018
1.7
135
0.16
10.4
24.1
24.5
<0.2
1.1
6.4
<0.02
9.63
<0.5
29
<0.1
0.97
4.6 j
<100
<0.5
0.063 j
891
0.021 j
3060
0.055 j
0.49 j,S1
0.22
1.6
42.5 j
AL-01S
Saprolite
02/08/2018
1 S1
145
<0.1
6.9
48.2
2520
<0.2
<0.5
2.7
0.021
18
1.8
9.05
0.21
<0.3
14
871
<0.5
0.71
80.3
6.5
4990
0.56
2.8
7.3
1.2 S1
<50
AL-01S
Saprolite
05/10/2018
0.93 SI
289 SI
0.09 j
7.9
41.4
1700
0.07 j
<0.5
1.7
0.11
19
1.6
8.23
0.2
0.093 j,SI
15.3
731
<0.5
2.8
52.3
4.5
3750
0.44
1.5
5.7
1.3 S1
<50
AL-01S
Saprolite
08/13/2018
0.66 B,S1
623
0.12 B
6.6
47.8
2440
0.11 j
0.5
6.7
0.087
21.8
1.6
9.17
0.24
<0.3
16.2 B
702
<0.5
2.9
53
5.4
3910
0.5
14.3
7
1.4 B
91
AL-01S
Saprolite
11/09/2018
0.79
441
0.33
8.2
40.3
1610
0.15 j
0.35 j
5.1
0.096
23.7
2.6
8.38
0.24
1.1
12.2
814
<0.5
4.6
53.6
4.4
4060
0.38
9.1
6
3.5
44.4 j
AL-02BR
Bedrock
02/12/2018
5.6
187 SI
0.14
19.7
17.4
62.2
<0.2
6.2
7.1 S1
0.3
8.5
18.2
21.4
<0.1
2.6
17.6
<100
0.56
0.37
136
<0.1
3020
<0.08
3.2 S1
0.78
2.6 S1
115
AL-02BR
Bedrock
05/14/2018
1.5 S3
216
0.12 SI
17.4
20.7
71.6
<0.2
10.2
38.4
0.21
6.59
19.3
24
<0.1
2.3
7 j,S1
<100
0.14 j
0.29
121
<0.1
3510
<0.08
1 S3
1.2
<0.5
67.1
AL-02BR
Bedrock
08/10/2018
0.34 j,S1
52.2
<0.1
18.2
21.8
44.2
<0.2
4.3
3.4
0.13
7.01
13.4
26.4
<0.1
2.8
3.4 j,B,SI
<100
0.13 j
0.45
124
<0.1
3770
<0.08
0.46 j
0.45
0.54 B,S1
<50
AL-02BR
Bedrock
11/12/2018
0.27 j,S1
<50
<0.1
14.6
23
37.2
<0.2
2.8
4.7
0.31
6.75
21.1
23.3
<0.1
3
<10
<100
<0.5
0.23
129
<0.1
5100
<0.08
0.8
0.82
0.6 BC,SI
<50
AL-02BRL
Bedrock
02/12/2018
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
AL-02BRL
Bedrock
04/10/2018
0.13 j,B
32.8 j
0.12 B
14.8
16.3
21.8
<0.2
0.42 j
0.62
0.2
6.6
7.5
17.1
<0.1
0.32
<10
<111
<0.5
0.095 j
88.9
<0.1
1390
<0.08
0.27 j
<0.1
<0.5
<55.6
AL-02BRL
Bedrock
05/14/2018
0.22 j,S1
<50
0.27 B,S1
50.7
14.2
8.3
<0.2
1.2
2.6
0.11 SI
21.9
5.3
23.1
<0.1
0.14 j,SI
4 j,S1
<100
<0.5
0.24
104
<0.1
1770
<0.08
0.83 SI
0.055 j
0.41 j,S1
<50
AL-02BRL
Bedrock
08/10/2018
0.99 S3
31.4 j
1
76.9
14.5
22.2
<0.2
0.44 j
0.2 j
0.13
27.6
5.7
24.4
<0.1
0.33S1
5.4 j,B,SI
<100
<0.5
0.074 j
97.2
<0.1
1760
<0.08
0.3 j
<0.1
0.34 j,S1
<50
AL-02BRL
Bedrock
11/12/2018
0.58 SI
35.6 j
0.24
30.3
16.9
6.5
<0.2
3.7
<0.5
0.067
15.8
3.5
20.7
<0.1
0.37
<10
<100
<0.5
0.21
71
<0.1
2310
<0.08
1.7
0.022 j
0.31 j,BC,SI
<50
AL-02BRLL
Bedrock
02/12/2018
<0.5
813
<0.1
23.5
39.8
867
<0.2
0.93
1.6 S1
<0.02
9.96
<0.5
31.3
<0.1
0.36S1
<10
<1000
<0.5
0.19
72.6
<0.1
9930
<0.08
0.76 SI
<0.1
<0.5 B
743
AL-02BRLL
Bedrock
04/10/2018
1.7 B
1360
0.36
17.6
38.5
961
<0.2
0.72
1.3
<0.02
8.82
<0.5
31.2
<0.1
1.3
3.7 j
<1110 D3
<1
<0.2
62.1
<0.2
10100
<0.16
0.28 j
0.044 j
14.3
722
AL-02BRLL
Bedrock
05/15/2018
0.24 j,S1
680
0.071 j
74.8
37.4
835
<0.2
1
0.79 SI
<0.02
23.7
<0.5
40.8
<0.1
0.16 j
<10
<100
<0.5
0.17
58.1
<0.1
9120
<0.08
<0.5
0.031 j
<0.5
432
AL-02BRLL
Bedrock
08/13/2018
<0.5
472
<0.1
68.9 N2,Ro
40.7
578
<0.2
0.92
0.47 j
<0.02
26.4
<0.5
42
0.038 j,M1
0.12 j
<10
<100
<0.5
0.13
51
<0.1
9700 M6
<0.08
0.11 j,B
0.049 j
<0.5
366
AL-02BRLL
Bedrock
11/12/2018
0.33 j,S1
100
<0.1
85.7
33.3
506
<0.2
2.5
2.4
0.46
25
14.4
39.5
<0.1
0.092 j
3.4 j
<100
<0.5
0.29
74.4
<0.1
7520
<0.08
0.12 j
0.082 j
0.61 SI
45.4 j,S1
AL-02D
Transition Zone
02/08/2018
14.5
315
<0.1
30.6
66.2
642
<0.2
1.9 S1
19.7
3.2
<25
109
58.2
<0.1
1
32.7
<100
<0.5
0.2
42.1
<0.1
9730
<0.08
1.3
5.4
9.5
<50
AL-02D
Transition Zone
05/14/2018
8.6
634
0.093 j,B,Sl
35.5
64.7
814
<0.2
1.8
22.6
3.4
10.9
106
60.1
0.029 j
1.1
22.7 SI
190
0.28 j
0.18
42.8
0.044 j
9420
0.073 j
0.58 S1
5.9
8
<50
AL-02D
Transition Zone
08/10/2018
9.5
482
0.058 j
30.4
73.1
170
<0.2
1.5
15.4
3
10.6
98
68.8
0.03 j
1 0.95
21.3 B,S1
<100
0.089 j
0.14
35.9
<0.1
9780
0.034 j
0.63
3.2
7.9
<50
AL-02D
Transition Zone
11/12/2018
3.3
283
<0.1
25.6
68.6
535
<0.2
1.2
18.5
3.4
11.1
89.8
63.7
0.016 j
1
11.3
<100
<0.5
0.086 j
37.2
0.022 j
9830
0.056 j
0.96
4.9
2.3 BC,S1
<50
AL-02S
Saprolite
02/08/2018
3.8 SI
1300
0.14 S1
5.6
125
208
0.84
3.3
67.6
1.8
<50
99.2
106
<0.1
<3 D3
15
<100
<0.5
0.32
37.9
0.98
11000
0.76
11.6
1.1
1.4 S1
250
AL-02S
Saprolite
05/14/2018
0.91 SI
626
0.1S1
I 6 SI
126 M6
223
1
0.09 j
9.7
2
10.9
97.9
104
<0.1
0.85 S1
17.1 S1
78 j
<0.5
0.24
35.5
1
11500
0.85
3
0.33
1.1 S1
52.8
Page 14 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
RADIONUCLIDES
OTHER PARAMETERS
Lead
(0.45u)
Manganese
(0.45u)
Mercury
(0.45u)
Molybdenum
(0.45u)
Nickel
(0.45u)
Phosphorus
(0.45u)
Selenium
(0.45u)
Silver
(0.45u)
Strontium
(0.45u)
Thallium
(0.45u)
Vanadium
(0.45u)
Zinc
(0.45u)
Radium-226
Radium-228
Total
Radium
Uranium-238
Total
Uranium
Uranium-238
DIS
Carbonate
Alkalinity
Fluoride
Phosphorus
Reporting Units
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pCi/L
pCi/L
pCi/L
ug/mL
ug/mL
ug/mL
mg/L
mg/L
mg/L
15A NCAC 02L Standard
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5A
NE
0.03A
NE
NE
2
NE
Background Threshold Values (Shallow Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
3
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Deep Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
2.8
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Bedrock Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5.7
NE
0.0005
NE
5
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
AB-18S
Ash Pore Water
02/12/2018
0.33
905
<0.2
131
2.2 SI
0.18
18
NA
1760
0.11
2.7
<10
NA
NA
NA
NA
NA
NA
<5
0.99
0.25
AB-18S
Ash Pore Water
05/10/2018
0.057j
448
<0.2
113
2 S1
0.41
0.82
NA
1500
<0.1
1.4
<10
NA
NA
NA
NA
NA
NA
<5
1.7
0.48
AB-18S
Ash Pore Water
08/08/2018
<0.1
595
<0.2
51
1.9 SS
0.5
IA SI
NA
1920
0.037j
1.6
<10
NA
NA
NA
NA
NA
NA
<5
1.4
0.46
AB-18S
Ash Pore Water
11/08/2018
<0.1
1110
<0.2
112
2.1
0.3
<0.5
NA
2490
<0.1
2.2
<10
NA
NA
NA
NA
NA
NA
<5
1.7
0.31
AB-20D
Bedrock
02/12/2018
<0.1
<5
<0.2
3.7
<0.5
<0.05
<0.5
NA
511
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.17
<0.05
AB-20D
Bedrock
05/14/2018
<0.1
4.2 j
<0.2
4.8
0.43 j
<0.05
<0.5
NA
460
<0.1
0.68
<10
NA
NA
NA
NA
NA
NA
<5
0.19 SI
<0.05
AB-20D
Bedrock
08/13/2018
<0.1
7.3
<0.2
40.8
0.84
0.038 j
<0.5
NA
477
<0.1
0.2 j
<10
NA
NA
NA
NA
NA
NA
<5
0.2
0.044 j
AB-20D
Bedrock
11/08/2018
<0.1
8.4
<0.2
18.8
0.51
<0.05
<0.5
NA
483
<0.1
0.08 j
<10
NA
NA
NA
NA
NA
NA
<5
0.21
<0.05
AB-20S
Ash Pore Water
02/12/2018
<0.1
8610
<0.2
2620
311
0.073
659
NA
9800
30.4
109
<200
NA
NA
NA
NA
NA
NA
<5
1.2
0.062
AB-20S
Ash Pore Water
05/14/2018
<0.5 D3
6630
<0.2
2110
282
0.065
618
NA
8940
28.2
116
200
NA
NA
NA
NA
NA
NA
<5
1.7
0.07
AB-20S
Ash Pore Water
08/13/2018
0.058j
7710
<0.2
2410
280
0.097
562
NA
8710
28.3
120
236
NA
NA
NA
NA
NA
NA
<5
1.6
0.084
AB-20S
Ash Pore Water
11/08/2018
<0.1
6040
<0.2
2090 M6
265 M1
0.046j
516 M6
NA
7930
27.9
92.7
343
NA
NA
NA
NA
NA
NA
<5
1.1 M1
0.041j
AB-21D
Transition Zone
02/07/2018
<0.1
146
<0.2
1.2
6.1
0.078
<0.5
NA
599
<0.1
0.55
<10
NA
NA
NA
NA
NA
NA
<5
0.18
0.054
AB-21D
Transition Zone
05/10/2018
<0.1
69.6
<0.2
1.3
1.5 SS
<0.05
<0.5
NA
401
<0.1
0.24 j
3.1 j
NA
NA
NA
NA
NA
NA
<5
0.26 M1,R1
0.027 j
AB-21D
Transition Zone
08/08/2018
<0.1
55.9
<0.2
IA SI
1.7 SI
0.039 j
0.33 j,S1
NA
399
<0.1
<0.3
4.6 j
NA
NA
NA
NA
NA
NA
<5
0.26
0.054
AB-21D
Transition Zone
11/07/2018
<0.1
74.5
<0.2
1.2
2.7
0.038 j
<0.5
NA
495
<0.1
0.3 j,B,SI
9.1 j,S1
NA
NA
NA
NA
NA
NA
<5
0.24
0.031 j
AB-21S
Ash Pore Water
02/07/2018
<0.1
9020
<0.2
1.1
2.4
0.14
<0.5
NA
910
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.12
0.32
AB-21S
Ash Pore Water
05/10/2018
<0.1
12600 M1
<0.2
1.1
2.4 S1
0.24
0.19 j
NA
956
<0.1
0.23 j
<10
NA
NA
NA
NA
NA
NA
<5
0.16
0.25
AB-21S
Ash Pore Water
08/08/2018
<0.1
9370
<0.2
1.2 SI
10.4
0.94
0.15 j,S1
NA
1100
0.074 j
0.14 j
<10
NA
NA
NA
NA
NA
NA
<5
0.17
0.86
AB-21S
Ash Pore Water
11/07/2018
<0.1
12200
<0.2
1.1
2.3
0.16
<0.5
NA
1290
0.021 j
0.2 j,B,SI
<10
NA
NA
NA
NA
NA
NA
<5
0.17
0.2
AL-01BR
Bedrock
02/08/2018
<0.1
<5
<0.2
<0.5
3.9
<0.05
<0.5
NA
2970
<0.1
0.83
<10
1.27 D6
9.41
10.68
<0.0005
<0.0005
NA
<5
<0.1
<0.05
AL-01BR
Bedrock
05/10/2018
<0.1
<5
<0.2
<0.5
2.9
<0.05
0.18 j
NA
2700
<0.1
0.79
<10
0.941
10.6
11.5
0.00027 j
0.00027 j
0.00022 j
<5
0.12
<0.05
AL-01BR
Bedrock
08/10/2018
<0.1
7.3
<0.2
0.62
4.9
<0.05
0.18 j
NA
2830
0.042 j
0.76
<10
1.74
9.45
11.2
0.00021 j
0.00021 j
0.0002 j
<5
0.11
<0.05
AL-01BR
Bedrock
11/09/2018
<0.1
<5
<0.2
0.2 j
3.2
<0.05
<0.5
NA
2920
<0.1
0.65
3.7 j,SI
1.73 SI
9
10.7
NA
0.00032 j
NA
<5
0.1
<0.05
AL-01D
Transition Zone
02/08/2018
<0.1
20.2
<0.2
<0.5
2.1
0.056
<0.5
NA
5340
<0.1
0.69
<10
1.07
10.1
11.17
<0.0005
<0.0005
NA
<5
<0.1
<0.05
AL-01D
Transition Zone
05/10/2018
<0.1
19.7
<0.2
<0.5
2.2 S1
<0.05
<0.5
NA
4860 M1
<0.1
0.58
4.6 j
0.867 D6
8.91
9.78
<0.0005
<0.0005
<0.0005
<5
<0.1
0.044 j
AL-01D
Transition Zone
08/10/2018
0.067 j
17.3
<0.2
1
2.6
0.039 j
<0.5
NA
4960
<0.1
0.72
5.4 j
2.08
8.77
10.9
<0.0005
<0.0005
<0.0005
<5
<0.1
0.037 j
AL-OSD
Transition Zone
11/09/2018
0.17
21.7
<0.2
0.56
3.3
0.041 j
<0.5
NA
5180
<0.1
0.75
9.1 j,S1
1.52 S1
8.51
10
NA
<0.0005
NA
<5
<0.1
0.047 j
AL-01S
Saprolite
02/08/2018
<0.1
2420
<0.2
<0.5
2.1
<0.05
<0.5
NA
2390
0.22
<0.3
13.3
0.508
1.54
2.048
<0.0005
<0.0005
NA
<5
0.66
<0.05
AL-01S
Saprolite
05/10/2018
0.04 j
1780
<0.2
<0.5
1 Sl
<0.05
1.6
NA
1870
0.24
0.11 j
10 j
0.136 U
2.07
2.21
<0.0005
<0.0005
<0.0005
<5
0.5
<0.05
AL-01S
Saprolite
08/13/2018
0.061 j
2120
<0.2
0.49 j,B
7.6
<0.05
2
NA
2140
0.22
0.28 j
12.2
0.358 U
2.45
2.81
<0.0005
<0.0005
<0.0005
<5
0.56
<0.05
AL-01S
Saprolite
11/09/2018
<0.1
1620
<0.2
0.38 j
6.6
<0.05
2.6
NA
1870
0.22
0.076 j
17.8 SI
0 U
1.44
1.44 U
NA
0.000083 j
NA
<5
0.47
0.043 j
AL-02BR
Bedrock
02/12/2018
<0.1
61.4
<0.2
7
7.1
0.086
17.2
NA
2450
<0.1
2.4
18.3
NA
NA
NA
NA
NA
NA
<5
<0.1
0.086
AL-02BR
Bedrock
05/14/2018
<0.1
62.5
<0.2
8.7
30.9
0.053
19.2
NA
2570
<0.1
2.7
2.5 j
NA
NA
NA
NA
NA
NA
<5
0.1 Sl
0.065
AL-02BR
Bedrock
08/10/2018
<0.1
37.3
<0.2
3.4
3.4
0.046 j
20.5
NA
2740
<0.1
3.4
2.6 j,B
NA
NA
NA
NA
NA
NA
<5
0.13
0.045 j
AL-02BR
Bedrock
11/12/2018
<0.1
31.6
<0.2
2.5
4.9
0.055
21.3
NA
3020
<0.1
2.8
4.9 j
NA
NA
NA
NA
NA
NA
<5
0.12
0.064
AL-02BRL
Bedrock
02/12/2018
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
AL-02BRL
Bedrock
04/10/2018
<0.1
11.4
<0.2
0.39 j
<0.5
<0.05
7
NA
1030
<0.1
<0.3
<11.1
0.567 U
-0.00171 U
0.567 U
0.0017
0.0017
NA
<5
0.49
<0.05
AL-02BRL
Bedrock
05/14/2018
0.078 j,S1
6.5
<0.2
1.2
1.9
<0.05
5.6
NA
1440
<0.1
0.28 j
39.2
NA
NA
NA
NA
NA
NA
<5
0.5 S1
<0.05
AL-02BRL
Bedrock
08/10/2018
0.076 j
10.6
<0.2
0.39 j
<0.5
<0.05
5.9
NA
1460
<0.1
0.18 j
<10
NA
NA
NA
NA
NA
NA
<5
0.51
<0.05
AL-02BRL
Bedrock
11/12/2018
<0.1
<5
<0.2
3.6
<0.5
<0.05
3.3
NA
1480
<0.1
0.26 j
<10
NA
NA
NA
NA
NA
NA
<5
0.48
0.027 j
AL-02BRLL
Bedrock
02/12/2018
<0.1
913
<0.2
1
1.3 S1
<0.05
<0.5
NA
3710
<0.1
<0.3
<100
NA
NA
NA
NA
NA
NA
<5
0.6
<0.05
AL-02BRLL
Bedrock
04/10/2018
<0.1
953
<0.2
0.55j
<1
<0.05
<0.5
NA
3630
<0.1
<0.6
<111 D3
0.526 U
5.3
5.83
0.00042j
0.00042j
NA
<5
0.62
0.041j
AL-02BRLL
Bedrock
05/15/2018
<0.1
707
<0.2
0.94
0.49j
<0.05
<0.5
NA
3320
<0.1
0.13j
<10
NA
NA
NA
NA
NA
NA
<5
0.52 M1
<0.05
AL-02BRLL
Bedrock
08/13/2018
<0.1
561
<0.2
0.77
0.61
<0.05
<0.5
NA
3120
0.025 j,B
<0.3
4.2 j,M 1,R1
NA
NA
NA
NA
NA
NA
<5
0.57
<0.05
AL-02BRLL
Bedrock
11/12/2018
<0.1
478
<0.2
2.2
2.6
<0.05
13.9
NA
3370
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.49
0.0263
AL-02D
Transition Zone
02/08/2018
<0.1
764
<0.2
4
22.4
<0.05
110
NA
7910
<0.1
0.66
28.3
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
AL-02D
Transition Zone
05/14/2018
<0.1
810
<0.2
1.6
24.8
<0.05
108
NA
8720
<0.1
0.7
22.9
NA
NA
NA
NA
NA
NA
<5
0.062 j,S1
<0.05
AL-02D
Transition Zone
08/10/2018
0.05j
376
<0.2
1.4
18.4
<0.05
97.7
NA
8560
0.027j
0.54
16.8 B
NA
NA
NA
NA
NA
NA
<5
0.065j
<0.05
AL-02D
Transition Zone
11/12/2018
<0.1
663
<0.2
1.3 B
22.7
0.029j
85.2
NA
8560
<0.1
0.61
13.8
NA
NA
NA
NA
NA
NA
<5
0.073j
0.055
AL-02S
Saprolite
02/08/2018
<0.1
172
0.26
2.8
51.1
0.097
99.5
NA
4890
<0.1
0.35
13.1
NA
NA
NA
NA
NA
NA
<5
<0.1
0.12
AL-02S
Saprolite
05/14/2018
0.04 j,S1
188
1
<o.5
10.3
o.11
92.3
NA
5000
<0.1
0.88
12.9
NA
NA
NA
NA
NA
NA
<5
<0.1 M1
0.13 M1
Page 15 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
FIELD PARAMETERS
WATER QUALITY PARAMETERS
SELECTED 40CFR257 APPENDIX III CONSTITUENTS plus Sr
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
PH
Water
Level
Temp
Spec
Cond
DO
ORP
Eh
Turbidity
Alkalinity
Bi-
carbonate
Alkalinity
Sulfide
Total
Organic
Carbon
Total
Suspended
Solids
Boron
Calcium
Chloride
Strontium
Sulfate
Total
Dissolved
Solids
Aluminum
Antimony
Arsenic
Barium
Beryllium
Cadmium
Chromium
(VI)
Chromium
Cobalt
Reporting Units
S.U.
ft
Deg C
pmhos/cm
mg/L
mV
mV
NTUs
mg/L
mg/L
mg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
6.5-8.5
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
700
NE
250
NE
250
Soo
NE
1*
10
700
4*
2
10
10
1*
Background Threshold Values (Shallow Unit)
4.6-6.4
NE
NE
NE
NE
NE
NE
NE
63
63
0.1
1
NE
50
10.7
5.5
303
4.2
140
757
0.5
0.4
310
0.2
0.08
5.7
16.5
1.2
Background Threshold Values (Deep Unit)
5.7-6.9
NE
NE
NE
NE
NE
NE
NE
204
204
0.1
1
NE
50
13.1
4.7
665
17.7
183
128
0.5
0.6
127
0.1
0.08
3
7.6
1.9
Background Threshold Values (Bedrock Unit)
5.6-7.6
NE
NE
NE
NE
NE
NE
I NE
108
108
0.1
1
NE
50
15
1 4.5
253
18.4
216
300
0.5
0.6
1 435
1 0.2
t0.08
3.9
1 8.3
2.8
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
AL-02S
Saprolite
08/1O/2018
5.2
115.10
25
2437
4.00
189
394
1.1
16.6
16.6
<0.1
0.65j
<2.5
12400
330
1.8
5300
1500
2500
147
<0.5
0.18
36.5
1
0.86
0.7
0.86 SI
0.11
AL-02S
Saprolite
11/12/2018
5.4
115.31
15
2470
3.50
206
411
0.8
20.3
20.3
<0.1
0.54j
<2.6
11900
331
1.9
5550
1580
2470
68.9j
<0.5
0.34
39
1.1
0.98
0.5
0.85 B,S1
0.18
AL-03BR
Bedrock
02/09/2018
9.8
116.07
17
542
0.50
-81
124
9.1
36.9
36.6
<0.1
1.2
3.4
1170
34.3
1.9
1090
168
367
<100
<0.5
0.49
95.6
<0.1
<0.08
0.048 S1
11.5
0.27
AL-03BR
Bedrock
05/11/2018
8.5
115.61
28
566
0.10
0
205
9.9
76.3
76.3
0.14
0.77j
9.1
1070
54.1
2
1040
177
397 SI
<100
<0.5
0.64 SI
105
<0.1
<0.08
<0.025
9.7
0.43
AL-03BR
Bedrock
08/13/2018
1.1
115.25
26
1179
0.60
-191
14
7.9
170
13
0.18
2.3
3.6
1140
26.2
2.5
1290
179
492
<100
0.093j
0.66
135
<0.1
<0.08
<0.025
0.71 SI
0.021j
AL-03BR
Bedrock
11/09/2018
8.3
114.91
17
578
1.00
-55
150
2.3
101
101
<0.1
<1
16.9
1290
80.7
1.9
1220
189
432
<100
<0.5
0.28
119
<0.1
<0.08
0.18 S1
0.4j
0.03j
AL-03D
Transition Zone
02/08/2018
6.5
113.68
12
966
0.80
-31
774
8.0
76.3
76.3
<0.1
<1
2.7
5370
128
2.7
2610
366
766
<100
1.2
0.18 S1
76.1
<0.1
<0.08
<0.025
6
1.7
AL-03D
Transition Zone
05/11/2018
6.1
112.67
23
987
0.70
58
263
6.4
66.3
66.3
<0.1
<1
4.2
5070
119 M6
2.9
2770
424 M6
794
263 S1
0.81
0.26 S1
74.3
<0.1
<0.08
0.2 M1
12.2
0.8
AL-03D
Transition Zone
08/13/2018
6.3
112.78
23
1003
4.00
31
236
9.0
65.6
65.6
<0.1
<1
4.7
5020
117
2.9
2800
457
820
149
0.4j
0.2
71.8
<0.1
<0.08
<0.025
2.2 SI
0.2
AL-03D
Transition Zone
11/09/2018
6.7
11.30
15
1002
1.80
-40
165
1.7
72.7
72.7
<0.1
<1
<2.6
5100
136
3
2900
467
832
76.8j
0.52
0.11
63.4
<0.1
<0.08
0.072 S1
1.8
0.2
AL-03S
Ash Pore Water
02/08/2018
8.2
112.63
7
4719
1.00
11
216
8.7
131
128
<0.1
<1
3
81700
500
22.1
16400
2370
4480
529
19.2
247
26.7
0.1
1.9
2.5
6.4
0.28
AL-03S
Ash Pore Water
05/11/2018
8.1
111.84
32
4732
0.20
84
289
9.8
128
128
<0.1
<1
23.4
76700
485
23
16200
2670
4790
5260
15.7
240
97.5
0.38
2.8
<0.025
3.8
1
AL-03S
Ash Pore Water
08/13/2018
8.2
11.81
22
4716
0.60
113
318
1.4
122
122
<0.1
<1
14.7
71200
486
23.9
15200
2910
4890
430
21
258
22.9
0.099j
<16 D3,S1
<0.025
0.46 j,S1
0.18
AL-03S
Ash Pore Water
11/09/2018
8.3
111.31
16
47
2.40
65
270
2.1
134
134
<0.1
<1
<5
68400
935
24.5
29500
957
4960
<1000
21.2
233
19.8
0.012j
6.4
<0.025
1.9
0.22
AL-04BR
Bedrock
02/08/2018
6.6
110.30
14
543
3.40
141
346
5.4
55.7
55.7
<0.1
<1
<2.5
8560 MI
48.8
1.5
2690 M1
174
432
<100
<0.5
<0.1
138
0.14
<0.08
0.2 M1
3.9 S1
0.32
AL-04BR
Bedrock
05/11/2018
6.3
110.10
25
609
2.00
71
276
5.5
47.7
47.7
<0.1
<1
3.6
$720
51.7
1.7
2840
228
465 S1
<100
0.21j
0.84
95.7
<0.1
<0.08
0.74
2.3
0.15
AL-04BR
Bedrock
08/13/2018
6.8
110.10
26
643
2.00
39
244
2.0
45.4
45.4
<0.1
<1
<2.7
9800
58
1.7
3020
251
510
<100
0.084j
0.076j
105
<0.1
<0.08
0.44
1.3 SI
0.081j
AL-04BR
Bedrock
11/12/2018
6.4
109.91
12
604
2.10
-2
203
1.3
43.9
43.9
<0.1
<1
<2.6
9730
59.1
1.8
2880
271
482
<100
<0.5
0.082 j
94.8
<0.1
0.091
0.36
2.4
0.11
AL-04BRL
Bedrock
02/12/2018
9.0
122.36
18
120
0.10
-375
-170
2.4
81.9
81.9
<0.1
<1
<2.5
<50
12.8
2.2
333
5
136
<100
<0.5
0.32
93.8
<0.1
<0.08
<0.025
0.64 SI
<0.1
AL-04BRL
Bedrock
05/14/2018
10.3
121.48
21
255
0.10
6
211
9.8
115
60
<0.1
0.95j
30.9
<50
16.4
2.4
453
5.4
127
147 S1
<0.5
0.47
122
<0.1
<0.08
<0.025
2.7 S1
0.08j
AL-04BRL
Bedrock
08/13/2018
11.4
121.74
23
935
1.40
-161
44
7.6
224
<5
<0.1
1.7
30.4
67.4
25.6
3
1090
6.1 MI
278
154
0.1j
0.41
270
<0.1
<0.08
<0.025 RI
1.6 SI
<0.1
AL-04BRL
Bedrock
11/12/2018
10.0
121.27
16
187
4.90
-128
77
8.0
110
62.9
<0.1
0.5j
23.8
<50
17.8
2.3
492
6.1
131
152
<0.5
0.36
154
<0.1
<0.08
<0.025
0.99 S1
0.063j
AL-04D
Transition Zone
02/08/2018
5.9
106.85
14
1725
0.10
203
408
7.3
43.9
43.9
<0.1
<1
3.8
30900
267
3.1
7750
798 M6
1580
214
<0.5
0.17 S1
102
0.19
0.12
0.71
5
0.53
AL-04D
Transition Zone
05/11/2018
6.1
106.95
26
214
1.70
68
273
5.1
40.7
40.7
<0.1
<1
3.6
2570
13.6
2.6
813
247
221 S1
137 S1
0.55
0.36 S1
114
<0.1
<0.08
1.2 P4,R0
6
0.67
AL-04D
Transition Zone
08/13/2018
5.9
106.95
24
1331
0.90
84
289
8.3
37.2
37.2
<0.1
0.58j
9.2
25200
194
3.2
5710
853
1440
494
0.28j
0.25
115
0.066j
0.13
0.29
1.3 S1
0.83
AL-04D
Transition Zone
11/12/2018
6.2
106.94
10
1013
2.80
-4
201
4.3
41.1
41.1
<0.1
0.61j
4.9
18700
136
2.9
4290
525
998
65.6j
0.21j
0.17
78
0.02j
0.077j
0.76
1.7 S1
0.74
BG-01BRA
Bedrock
02/09/2018
7.1
15.64
9
177
2.30
45
250
9.6
91.1
91.1
<0.1 MI
<1
6.3
<50 1g
15.1
2.4
189
2.4
142
1090
<0.5
1
410
<0.1
<0.08
1.9 M6
3 S1
0.53
BG-01BRA
Bedrock
05/11/2018
6.6
14.98
18
175
2.60
54
259
7.0
83.8
83.8
<0.1
<1
5.1
<50
13.3
2.3
178
2.2
145 S1
346 S1
0.29j
0.19 S1
394
<0.1
<0.08
1.5
3.5
0.44
BG-01BRA
Bedrock
08/1O/2018
6.9
14.89
25
188
1.90
76
281
4.0
84.2
84.2
<0.1
<1
<2.5
<50
19.8 M1
2.4
256
2
153
138
<0.5
0.13
567 M1
<0.1
<0.08
2.8
2.5
0.062j
BG-01BRA
Bedrock
11/08/2018
6.9
14.45
16
173
1.80
85
290
2.2
91.9
91.9
<0.1
<1
<2.5
<50
14.5
2.5
184
1.9
146
79.5 j
0.11 j
0.13
432
<0.1
<0.08
2.5
3.2 BC,S1
0.16
BG-01D
Transition Zone
02/09/2018
6.3
12.14
8
175
2.60
217
422
6.8
72.3
72.3
<0.1
<1
<2.5
<50 1g
12.3
2.9
676
8.9
130
213
<0.5
0.37
120
<0.1
<0.08
1.7
2.9 S1
1.1
BG-01D
Transition Zone
05/11/2018
6.0
10.92
22
179
2.40
53
258
1.7
73.2
73.2
<0.1
<1
<5
<50
12
3
648
9
137 SI
<100
<0.5
0.14 S1
120
<0.1
<0.08
3.3 M6,R1
2.7
0.2
BG-01D
Transition Zone
08/1O/2018
5.7
11.02
22
183
2.60
-61
144
3.9
74.1
74.1
<0.1
0.98 j
<2.5
<50
12.6
3.1
718
9.3
144
<100
<0.5
0.12
138
<0.1
<0.08
2.7
3.1
0.12
BG-011)
Transition Zone
11/08/2018
6.2
10.46
16
183
2.60
-76
130
2.4
79.8
79.8
<0.1
<1
<2.5
<50
12.8
3.2
718
9
138
<100
<0.5
0.11
142
<0.1
<0.08
2.6
3 BC,SI
0.2
BG-01S
Saprolite
02/09/2018
5.4
3.62
9
169
7.40
256
461
3.2
<5
<5
<0.1
2.9
<2.5
<50 Ig
7.86
4
163
7.5
126
136
<0.5
0.11
80
<0.1
<0.08
1.7
2.3 S1
0.17
BG-01S
Saprolite
05/11/2018
5.3
9.83
18
120
4.30
215
420
4.5
8.8
8.8
<0.1
1.2
<2.5
<50
5.09
2.1
115
8
89 SS
184 S1
<0.5
0.082 j,S1
43.9
0.046 j
<0.08
2.9
3.6
0.18
BG-01S
Saprolite
08/1O/2018
5.0
5.70
22
83
2.60
-56
149
7.4
12.2
12.2
<0.1
1.4
<2.5
30.9 j
3.77
5.2
81.7
10.5
62
752
<0.5
0.087 j
35.4
<0.1
<0.08
5.7
5.2
0.18
BG-01S
Saprolite
11/08/2018
5.4
4.47
17
112
2.60
-60
145
4.1
10.9
10.9
<0.1
1.5
<2.5
31.5 j
5.19
2.6
108
8.5
86
102
<0.5
0.075 j
48.6
0.047 j
<0.08
3
3.8 BC,SI
0.19
BG-02BR
Bedrock
02/09/2018
6.8
6.75
14
197
3.40
150
355
0.6
99.4
99.4
<0.1
<1
5.3
<50
13.4
2.3
240
3.2
151
<100
<0.5
0.19
446
<0.1
<0.08
7
7.3
<0.1
BG-02BR
Bedrock
05/11/2018
6.8
6.60
17
192
3.60
108
313
3.1
88
88
<0.1
<1
<2.5
<50
13.1
2.5
246
3.2
152 S1
<100
<0.5
0.18 S1
470
<0.1
<0.08
10
7.8
0.026j
BG-02BR
Bedrock
08/1O/2018
6.8
6.78
20
196
3.00
59
264
1.2
96.3
96.3
<0.1
0.61 j
<2.5
<50
14.5
2.4
240
2.7
153
51.3 j
<0.5
0.17
458
<0.1
<0.08
7.8
7.5
0.0261
BG-02BR
Bedrock
11/08/2018
6.4
6.25
17
192
3.20
66
271
0.4
104
104
<0.1
<1
<2.5
<50
15
2.7
249
3.2
158
<100
<0.5
0.18
523
<0.1
<0.08
6.8
6.7 BC,S1
0.03j
BG-02S
Saprolite
02/09/2018
6.2
2.68
13
SOS
4.80
112
317
9.7
43.5
43.5
<0.1
<1
<2.5
<50
6.34
1.3
152
5.5
102
1870
<0.5
0.2
261
<0.1
<0.08
3.3
6.2 S1
0.21
BG-02S
Saprolite
05/11/2018
6.3
5.16
15
136
4.10
62
267
2.7
57.2
57.2
<0.1
<1
<2.5
<50
8.27
1.9
195
6
122 S1
374 S1
<0.5
0.15 S1
303
0.048 j
<0.08
4.8
5.6
0.072 j
BG-02S
Saprolite
08/1O/2018
6.3
3.77
20
136
3.40
144
349
5.5
57
57
<0.1
0.57 j
11.2
<50
8.49
1.8
183
5.8
120
530
<0.5
0.13
309
<0.1
<0.08
5.6
5.5
0.067 j
BG-02S
Saprolite
11/08/2018
6.3
2.95
17
130
3.70
146
351
6.4
59
59
<0.1
<1
<2.5
<50
8.28
1.9
182
5.8
111
493
<0.5
0.14
313
0.028j
<0.08
4.1
6.5 BC,S1
0.11
BG-03BR
Bedrock
02/09/2018
6.6
38.24
14
232
4.40
165
370
8.5
106
106
<0.1
<1
3.5
<50 1g
11.3
2.4
184
10.5
175
150
<0.5
0.42
61
<0.1
<0.08
3.6
4.4 S1
0.16
BG-03BR
Bedrock
05/11/2018
6.5
35.47
21
238
3.40
113
318
7.2
105
105
<0.1
<1
<2.5
<50
11.8
2.5
182
10.7
173 S1
97.8 j,S1
<0.5
0.69 S1
57.7
<0.1
<0.08
5.1
4.7
0.21
BG-03BR
Bedrock
08/1O/2018
6.6
35.88
31
245
3.90
81
286
9.8
105
105
<0.1
0.6j
15.6 D6
<50
12.4
2.5
180
11.3
181
601
<0.5
0.4
68
<0.1
<0.08
2.9
5.1
0.47
BG-03BR
Bedrock
11/08/2018
6.4
35.44
16
232
3.80
55
260
2.5
114
114
<0.1
<1
31.4
<50
13.3
2.5
188
10.9
195
992
<0.5
0.45
83
0.021j
<0.08
3.6
7.3 BC,S1
0.94
BG-03D
Bedrock
02/09/2018
6.6
30.47
13
231
5.10
169
374
7.7
105
105
<0.1
<1
<2.5
<50 1g
11
2.5
158
10.4
180
<100
<0.5
0.55
799
<0.1
<0.08
5.1
5.7 SI
0.11
BG-03D
Bedrock
05/11/2018
6.4
26.90
24
234
3.80
99
304
3.7
106 M1
106
<0.1
<1
<5
<50
9.74
2.6 M1
159
11 MS
176 S1
<100
<0.5
0.35 SS
780
<0.1
<0.08
5.8 M6,R1
5.5
0.048j
Page 16 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
Copper
Iron
Lead
Lithium
Magnesium
Manganese
Mercury
Molybdenum
Nickel
Nitrate
+ Nitrite
Potassium
Selenium
Sodium
Thallium
Vanadium
Zinc
Aluminum
(0.45u)
Antimony
(0.45u)
Arsenic
(0.45u)
Barium
(0.45u)
Beryllium
(0.45u)
Boron
(0.45u)
Cadmium
(0.45u)
Chromium
(0.45u)
Cobalt
(0.45u)
Copper
(0.45u)
Iron
(0.45u)
Reporting Units
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
mg-N/L
mg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
1000
300
15
NE
NE
50
1
NE
100
NE
NE
20
NE
0.2*
0.3*
1000
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Shallow Unit)
3.8
744
0.3
NE
1.8
75.3
0.2
0.5
9.9
2.7
5
0.5
9.1
0.1
5.6
19.2
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Deep Unit)
2.8
272
0.1
NE
14.4
141
0.2
3.2
7.5
1.4
7.8
0.5
29.2
0.1
3.8
17
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Bedrock Unit)
4.2
792
0.2
NE
13.2
26.6
0.2
3
7.2
1 0.4
9.8
0.5
14
1 0.1
16
11.9
NE
NE
NE
NE
NE
NE
NE
NE
I NE
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
AL-02S
Saprolite
08/10/2018
0.77 Sl
46 j
<0.1
4.3
133
268
0.9
<0.5
8.1
2.1
10.3
90.6
104
<0.1
0.71
15.3 B,S1
<100
<0.5
0.21
32.6
0.95
10600
0.95
1
0.1
1.5 B,S1
<50
AL-02S
Saprolite
11/12/2018
1.5
39.4 j
<0.1
5.1
131
318
1.4
<0.5
8.4
2.2
10.8
83.4
103
<0.1
0.85
11.9
<100
<0.5
0.16
34.6
0.94
10500
0.91
0.74
0.15
1.1 BC,S1
<50
AL-03BR
Bedrock
02/09/2018
0.7 Sl
64.2 SI
<0.1
114
7.33
30.1
<0.2
4.4
7.6
0.037
33
6.4
41.2
<0.1
<0.3
<10
<100
<0.5
0.47
85.9
<0.1
1080
<0.08
1.4 SI
<0.1
<0.5
<50
AL-03BR
Bedrock
05/11/2018
0.31 i
51.2
0.028 j,S1
59.3
9.01
50
<0.2
3.9
6.7
0.077
19.5
9.4
30.5
<0.1
0.21 j,B,SI
<10
<100
0.13 j
0.57
100
<0.1
1130
<0.08
0.74 Sl
0.13
<0.5
26.2 j
AL-03BR
Bedrock
08/13/2018
2.1
33.7 j
0.058 j
266
1.56
8.2
<0.2
4.9
1 sl
<0.02
77.6
3.9
85.9
<0.1
0.17 j,B,SI
2.6 j
<100
0.086 j
0.6
127
<0.1
1050
<0.08
0.17 j
<0.1
2.5
<50
AL-03BR
Bedrock
11/09/2018
0.16 j
<50
<0.1
38
12.7
127
<0.2
2.6
<0.5
0.082
13
9.4
22.2
<0.1
0.073 j
<10
<100
<0.5
0.32
106
<0.1
1030
<0.08
0.48 j,S1
0.026 j
<0.5
<50
AL-03D
Transition Zone
02/08/2018
1.3 S1
442
0.11 SI
18.7
42.4
124
<0.2
2 S1
12.1
0.081
9.77
45.4
30.4
<0.1
0.31 S3
24.5
<100
0.59
0.1
66.9
<0.1
4740
<0.08
0.59
0.87
<0.5
<50
AL-03D
Transition Zone
05/11/2018
5.9
1060
0.21 Sl
16.8
40.4
71.5
<0.2
1.5
10.3
0.069
8.56
51
29
<0.1
0.95 S3
20.3
<100
0.46 j
0.17
65
<0.1
4580
<0.08
0.74 S3
0.52
0.55 SI
134
AL-03D
Transition Zone
08/13/2018
2.4
479
0.22
16.3
43.2
26.9
<0.2
0.67
2.6
0.073
8.04
51.1
30
<0.1
0.75 B,S1
11.6
<500
0.18 j
0.14
65
<0.1
4760
<0.08
0.21 j
0.16
1.8
<250
AL-03D
Transition Zone
11/09/2018
1.7
SOS
<0.1
18.4
44.6
23.1
<0.2
1.1
2.7
0.11
7.87
56.7
30.9
<0.1
0.37
13.4
<100
0.21 j
0.08 j
60.2
<0.1
4840
<0.08
0.4 j,S1
0.12
0.65 SI
<50
AL-03S
Ash Pore Water
02/08/2018
1.8 Sl
199
0.17 SI
14600
291
118
<0.2
41800
3.9
0.22
287
66.7
205
3.4
234
10.6
197
16.7
229
21.7
<0.5 D3
66900
1.3
3.4
0.25
<0.5
<50
AL-03S
Ash Pore Water
05/11/2018
4
1680
1.4
12700
279
128
<0.2
39700
3
0.069
298
44.5
204
2.9
219
25.1
396
16.1
223
20.4
0.089j
67000
1.1
<0.5
0.16
0.18 j,S1
<50
AL-03S
Ash Pore Water
08/13/2018
0.99 B,S1
<50
<0.1
15100
297
109
<0.2
43500
0.52 SI
0.082
296
68
222
3.8
235
10.8
<5000
17.6
235
<250
0.096j
62600
<16 D3,S1
0.22j
0.19
1.7
<2500
AL-03S
Ash Pore Water
11/09/2018
1.2
25.7j
3.2
12600
562
86.6
<0.2
41900
0.72
0.14
566
68.8
445
5.2
208
150
<100
19.6
229
21.8
<0.1
61400
7.8
0.25 j,S1
0.2
0.52 S1
<50
AL-04BR
Bedrock
02/08/2018
49.8
177
0.2 S1
37.2
23
11.5
<0.2
1.3 S1
6.4
0.93
14
6.1
24.2
<0.1
2.9
18.4
<100
<0.5
0.11
96.8
<0.1
8480
<0.08
1.1
<0.1
13.3
<50
AL-04BR
Bedrock
05/11/2018
2
345
0.16 Sl
31.9
23.7
7.9
<0.2
1.3
5.6
1.2
9.9
6.5
21.9
0.035 j
4.3
4.2 j
<100
<0.5
0.39
86.3
<0.1
8680 M1
<0.08
1.2 Sl
0.063 j
0.69 Sl
25.6 j
AL-04BR
Bedrock
08/13/2018
1.2S1
62.7
0.094 j,B
36.3
27
2.8 j
<0.2
0.2 j
4.8
1.2
12.7
6.4
25.4
<0.1
3
3 j,B
<100
<0.5
0.078 j
74.5
<0.1
8480
<0.08
0.61
0.042 j
0.86 B
<50
AL-04BR
Bedrock
11/12/2018
1 sl
43.1 j
<0.1
34.8
26.7
<5
<0.2
0.16 j
5.9
1.4
10.2
6.2
24.4
<0.1
3
3.7 j
<100
<0.5
0.049 j
79.3
<0.1
8900
<0.08
0.57
0.047 j
1 BC,S1
<50
AL-04BRL
Bedrock
02/12/2018
<0.5
559
<0.1
15.1
3.96
58.4
<0.2
1.9
0.57 Sl
<0.02
6.1
<0.5
15.6
<0.1
<0.3
<10
<100
<0.5
0.32
85.2
<0.1
<50
<0.08
<0.5
<0.1
<0.5 B
510
AL-04BRL
Bedrock
05/14/2018
0.22 j,S1
252
1
42.3
3.12
31.2
<0.2
2.6
1.3
<0.02
10.6
<0.5
28.5
<0.1
0.6 S1
<10
55.9 j
<0.5
0.44
110
<0.1
<50
<0.08
0.88 51
0.027 j
<0.5
56.8
AL-04BRL
Bedrock
08/13/2018
0.77 B,S1
103
1.2
119
0.972
10.8
<0.2
2.8
0.44 j,S1
<0.02
28
<0.5
61.6
<0.1
0.47 S3
3.1 j,B
<100
0.097 j
0.4
219
<0.1
25.2 j
<0.08
0.87
<0.1
0.32 j,B
25.2 j
AL-04BRL
Bedrock
11/12/2018
0.56 S3
605
0.55
39.5
4.11
53.2
<0.2
1.5
<0.5
<0.02
9.64
<0.5
22.9
<0.1
0.45
3.5 j
<100
<0.5
0.29
112
0.019 j
<50
<0.08
0.29 j
0.021 j
1.4 BC,S1
254 SI
AL-04D
Transition Zone
02/08/2018
0.75 Sl
422
<0.1
420
95.4
85.9
<0.2
1.9 S1
15.1
6.3
9.63
11.5
50.4
<0.1
3.5
<10
<100
<0.5
0.24
74.6
<0.1
29200
0.11
3.3
0.37
0.64 SI
55.1
AL-04D
Transition Zone
05/11/2018
0.94
262
0.098 j,S1
15.2
4.96
56.8
<0.2
3.5
5.8
0.22
4.2 j
3
15.3
<0.1
3.4
8.2 j
<100
0.34 j
0.34
91
<0.1
14500
0.086
0.97 S3
0.25
0.71 SI
34.4 j
AL-04D
Transition Zone
08/13/2018
IA Sl
1170
0.19 B
288
74.3
104
<0.2
1.7
11.2
5.8
8.83
11.2
44.3
0.032j
4.1
14.7 B
<5000
0.13j
0.19
<250
0.053j
26000
0.1
0.54
0.17
2.9 B
<2500
AL-04D
Transition Zone
11/12/2018
1.1
179
0.14
145
51.5
54.2
<0.2
1.5
7.9
3.8
7.23
9.4
34.5
<0.1
3.2
5.9 j
<100
0.14 j
0.1
80.3
0.028 j
19300
0.079 j
0.57
0.15
1.8 BC,S1
<50
BG-01BRA
Bedrock
02/09/2018
2.4 Sl
757
0.46
7.1
7.99
42.2
<0.2
1
3.4 S1
0.57
6.37
<0.5
8.12
<0.1
19.3
<10
<100
<0.5
0.46
397
<0.1
<50
<0.08
2.6 S1
0.25
3.2
82.1 B
BG-01BRA
Bedrock
05/11/2018
1.6
174
0.33 sl
6.5
7.16
60.6
<0.2
0.99
3.5
0.55
5.88
0.32 j
7.18
<0.1
20.2
<10
<100
<0.5
0.15
365
<0.1
<50
<0.08
2
0.035 j
0.55S1
<50
BG-01BRA
Bedrock
08/10/2018
0.64 Sl
46.3 j
<0.1
6.3
10.7 M1
16.8
<0.2
0.43 j
1.5
0.56
8.05 M1
0.26 j
10.4 MI
<0.1
18
4.9 j,B,SI
<100
<0.5
0.13
363
<0.1
<50
<0.08
2.5
0.023 j
0.54 B,S1
<50
BG-01BRA
Bedrock
11/08/2018
1.1 sl
52.8 B,BC
0.11
6.3
8
23.8
<0.2
0.32 j
1.9
0.56
6.13
<0.5
7.7
0.016 j
17.9
4.2 j,B
<100
<0.5
0.13
357
<0.1
<50
<0.08
2.6
0.017 j
0.86 Sl
<50
BG-01D
Transition Zone
02/09/2018
5.1 Sl
225 SI
<0.1
10.9
7.68
25.6
<0.2 M1,R1
<0.5
7
1.6
5.12
2.9
10.6
<0.1
4
<10
<100
<0.5
0.22
125
<0.1
<50
<0.08
2.4 S1
0.35
0.54 S1
65.4 B
BG-OSD
Transition Zone
05/11/2018
2.4
<50
0.047 j,S1
10
7.44
8.3
<0.2
0.26 j,S1
5.4
1.5
4.83 j
2.1
10.7
<0.1
3.6
<10
<100
<0.5
0.13
106
<0.1
<50
<0.08
2.4
0.12
2.3 S1
<50
BG-01D
Transition Zone
08/10/2018
3.1
<50
<0.1
9.6
7.51
9.5
<0.2
0.19 j
4.5
1.5
4.85 j
2.2
11.1
<0.1
3.4
4.4 j,B,SI
<100
<0.5
0.12
315
<0.1
<50
<0.08
2.5
0.14
4.6
<50
BG-OSD
Transition Zone
11/08/2018
3 Sl
30.4 j,B,BC
<0.1
9.6
7.69
8.9
<0.2
0.21 j
4.9
1.5
5.16
2.3
10.8
<0.1
3.6
4.1 j,B
<100
<0.5
0.11
112
<0.1
<50
<0.08
2.5
0.16
2.9
<50
BG-01S
Saprolite
02/09/2018
0.96 SI
114 SI
<0.1
<0.5
11.4
7.6
<0.2
<0.5
6.5
16.7
<5
<0.5
<5
<0.1
<0.3
<10
<100
<0.5
0.14
75.1
<0.1
<50
<0.08
2.4 S1
0.18
0.67 S1
<50
BG-01S
Saprolite
05/11/2018
0.57
142
0.073 j,S1
0.21 j
7.46
5.8
<0.2
0.084 j,S1
3.6
9.1
<5
<0.5
1.62 j
<0.1
0.58 S1
2.7 j
82.4 j
<0.5
0.067 j
45
0.054 j
54.5
<0.08
2.9
0.14
0.7 S1
37.2 j
BG-01S
Saprolite
08/10/2018
0.62 SI
529
0.089 j
<0.5
5.37
8.9
<0.2
<0.5
2.5
1.5
<5
<0.5
2.13 j
<0.1
0.47 S3
3.7 j,B,SI
<100
<0.5
0.061 j
28.3
<0.1
26.8 j
<0.08
4.6
0.14
0.73 B,S1
<50
BG-01S
Saprolite
11/08/2018
0.58 sl
86.8 B,BC
<0.1
0.19 j,B
7.53
9.3
<0.2
<0.5
3.1
6.3
<5
<0.5
2.02 j
<0.1
0.67 S3
3.9 j,B
<100
<0.5
0.075 j
38.7
0.04 j
27.1 j
<0.08
3.2
0.16
0.86 Sl
<50
BG-02BR
Bedrock
02/09/2018
0.74 Sl
<50
<0.1
9.1
9.49
<5
<0.2
<0.5
IA Sl
0.25
5.39
<0.5
7.71
<0.1
14
<10
<100
<0.5
0.19
492
<0.1
<50
<0.08
6.9
<0.1
0.58 51
<50
BG-02BR
Bedrock
05/11/2018
0.32 j
<50
0.032 j,S1
8.2
9.36
<5
<0.2
0.33 j,S1
0.98
0.26
5.69
<0.5
7.48
<0.1
14.2
<10
<100
<0.5
0.14
511
0.039 j
<50
<0.08
6.8
0.025 j
1.2 SI
<50
BG-02BR
Bedrock
08/10/2018
0.56 SI
<50
<0.1
8
9.85
<5
<0.2
0.28 j
0.9
0.33
5.85
<0.5
8.39
<0.1
13.9
3 j,B,SI
<100
<0.5
0.16
417
<0.1
<50
<0.08
7.2
<0.1
0.78 B,S1
<50
BG-02BR
Bedrock
11/08/2018
4.6
<50 BC
<0.1
7.8
10.7
<5
<0.2
0.16 j
1.3
0.24
5.96
<0.5
8.18
<0.1
13.8
3.3 j,B
<100
<0.5
0.18
440
<0.1
<50
<0.08
5.9
0.019 j
1 Sl
<50
BG-02S
Saprolite
02/09/2018
0.99 SI
2380
0.46
3.8
4.72
7.7
<0.2 M1
<0.5
4.5
0.32
<5
<0.5
5.33
<0.1
8.4
<10
<100
<0.5
0.16
219
<0.1
<50
<0.08
3.9 S1
<0.1
<0.5
<50
BG-02S
Saprolite
05/11/2018
0.32 j
198
0.12 51
4.7
6.04
<5
<0.2
0.14 j,S1
4
0.36
2.87 j
0.24 j
7.16
<0.1
9.6
<10
<100
<0.5
0.12
297
0.067 j
<50
<0.08
5.1
0.039 j
0.29 j,S1
<50
BG-02S
Saprolite
08/10/2018
0.42 j,S1
353
0.1
4.8
6.53
<5
<0.2
0.076 j
3.9
0.37
2.95 j
0.24 j
7.61
<0.1
8.5
3.9 j,B,SI
<100
<0.5
0.12
270
<0.1
<50
<0.08
4.8
<0.1
0.35 j,B,SI
<50
BG-02S
Saprolite
11/08/2018
0.48 j,S1
356 BC
0.15
4.8 B
6.42
<5
<0.2
<0.5
4
0.39
3.06 j
<0.5
7.53
<0.1
8.5
4.2 j,B
<100
<0.5
0.12
256
0.014 j
<50
<0.08
4.5
0.033 j
0.97 Sl
28.8 j
BG-03BR
Bedrock
02/09/2018
1.5 sl
241 Sl
<0.1
10.4
12
5.3
<0.2
1.8
3.3 S1
0.3
7.05
<0.5
12.5
<0.1
1s
<10
<100
<0.5
0.4
55.2
<0.1
<50
<0.08
4 Sl
<0.1
1.1 SS
<50
BG-03BR
Bedrock
05/11/2018
1.5
153
<0.1
9.7
12.2
8.5
<0.2
1.8
3.5
0.27
7.54
0.21 j
12.4
<0.1
16
2.7 j
<100
<0.5
0.63
50.6
<0.1
<50
<0.08
4.1
0.079 j
0.98 SI
<50
BG-03BR
Bedrock
08/10/2018
2.7 S1
997
0.13
10.4
13.1
15.8
<0.2
1.7
4.8
0.26
7.63
0.19 j
12.7
<0.1
16.1
19.4 B,S1
<100
<0.5
0.34
51.2
<0.1
<50
<0.08
3.5
0.09 j
1.2 S1
51.1
BG-03BR
Bedrock
11/08/2018
5.2
1.500 BC
0.28
10
14
20
<0.2
1.8
7.7
0.28
8.39
<0.5
13.7
<0.1
17.9
8 j,B
76.6 j
<0.5
0.36
49.1
0.03 j
<50
<0.08
3.9
0.17
2.7 Sl
101
BG-03D
Bedrock
02/09/2018
0.68 S1
60.6 SI
<0.1
7.8
14.3
<5
<0.2
<0.5
5.1
0.39
7.65
<0.5
13.4
<0.1
25.8
<10
<100
<0.5
1 0.45
808
<0.1
<50
<0.08
5.4
<0.1
0.52 S1
<50
BG-03D
Bedrock
05/11/2018
0.45 j
<50
<0.1
6.9
12.9
<5
<0.2
0.21 j,S1
5
0.35
7.51
<0.5
12.6
<0.1
25.9
<10
<100
<0.5
1 0.38
753
1 <0.1
<50
<0.08
5.2
0.021 j
0.39 j,S1
<50
Page 17 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
RADIONUCLIDES
OTHER PARAMETERS
Lead
(0.45u)
Manganese
(0.45u)
Mercury
(0.45u)
Molybdenum
(0.45u)
Nickel
(0.45u)
Phosphorus
(0.45u)
Selenium
(0.45u)
Silver
(0.45u)
Strontium
(0.45u)
Thallium
(0.45u)
Vanadium
(0.45u)
Zinc
(0.45u)
Radium-226
Radium-228
Total
Radium
Uranium-238
Total
Uranium
Uranium-238
DIS
Carbonate
Alkalinity
Fluoride
Phosphorus
Reporting Units
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pCi/L
pCi/L
pCi/L
ug/mL
ug/mL
ug/mL
mg/L
mg/L
mg/L
15A NCAC 02L Standard
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5A
NE
0.03A
NE
NE
2
NE
Background Threshold Values (Shallow Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
3
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Deep Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
2.8
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Bedrock Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5.7
NE
0.0005
NE
5
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
AL-02S
Saprolite
08/10/2018
<0.1
227
0.5
<0.5
7.9
0.12
95.4
NA
4820
<0.1
0.76
12.6 B
NA
NA
NA
NA
NA
NA
<5
<0.1
0.11
AL-02S
Saprolite
11/12/2018
<0.1
278
0.15 j
<0.5
8.4
0.13
74
NA
5030
<0.1
0.71
21.9
NA
NA
NA
NA
NA
NA
<5
0.051 j
0.15
AL-03BR
Bedrock
02/09/2018
<0.1
27.1
<0.2
4.4
3.4
<0.05
6.7
NA
1010
<0.1
0.32
<10
NA
NA
NA
NA
NA
NA
<5
1.2
<0.05
AL-03BR
Bedrock
05/11/2018
<0.1
39
<0.2
3.9
3.8
<0.05
9.6
NA
990
<0.1
0.35 SI
<10
NA
NA
NA
NA
NA
NA
<5
1.3
<0.05
AL-03BR
Bedrock
08/13/2018
<0.1
<5
<0.2
5.2
0.51
<0.05
3.9
NA
1160
<0.1
0.2 j
<10
NA
NA
NA
NA
NA
NA
157
0.9
<0.05
AL-03BR
Bedrock
11/09/2018
<0.1
89.3
<0.2
0.86
<0.5
<0.05
9.2
NA
1030
<0.1
0.14 j
<10
NA
NA
NA
NA
NA
NA
<5
1.1
<0.05
AL-03D
Transition Zone
02/08/2018
<0.1
65.6
<0.2
1
6.2
<0.05
58.6
NA
2420
<0.1
<0.3
15.1
NA
NA
NA
NA
NA
NA
<5
0.15
<0.05
AL-03D
Transition Zone
05/11/2018
<0.1
60.6
<0.2
1.3
4
<0.05
42.1
NA
2570
<0.1
0.32 SI
16.8
NA
NA
NA
NA
NA
NA
<5
0.16
<0.05
AL-03D
Transition Zone
08/13/2018
<0.1
27.1
<0.2
0.82
1.8
<0.05
52.5
NA
2560
<0.1
0.31
<50
NA
NA
NA
NA
NA
NA
<5
0.16
<0.05
AL-03D
Transition Zone
11/09/2018
<0.1
19.1
<0.2
1.7
1.9
0.036 j
46.9
NA
2610
<0.1
0.28 j
9.5 j,S1
NA
NA
NA
NA
NA
NA
<5
0.15
<0.05
AL-03S
Ash Pore Water
02/08/2018
<0.1
III
<0.2
38400
3.7
<0.05
55.9
NA
13600
3
212
<10
NA
NA
NA
NA
NA
NA
<5
0.39
<0.05
AL-03S
Ash Pore Water
05/11/2018
<0.1
107
<0.2
40900
0.49 j,S1
<0.05
37.6
NA
14400
2.3
209
8.2j
NA
NA
NA
NA
NA
NA
<5
0.44
0.026j
AL-03S
Ash Pore Water
08/13/2018
0.046j
<250
<0.2
39900
0.59
<0.05
52.8
NA
13500
3.1
208
<500
NA
NA
NA
NA
NA
NA
<5
0.45
0.033j
AL-03S
Ash Pore Water
11/09/2018
<0.1
89.1
<0.2
40400
0.63
0.032 j,M1
59.6
NA
13900
4.1
193
9.8 j,S1
NA
NA
NA
NA
NA
NA
<5
0.46
0.026j
AL-04BR
Bedrock
02/08/2018
<0.1
<5
<0.2
<0.5
4.7
0.058
6.4
NA
2610
<0.1
3
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
AL-04BR
Bedrock
05/11/2018
<0.1
7.7
<0.2
0.61
4.4
<0.05
6.6
NA
2750
<0.1
3.3
3.6 j
NA
NA
NA
NA
NA
NA
<5
0.11
0.065
AL-04BR
Bedrock
08/13/2018
<0.1
<5
<0.2
0.11 j,B
4.2
0.044 j
6.6
NA
2610
<0.1
3.2
<10
NA
NA
NA
NA
NA
NA
<5
0.1
0.038 j
AL-04BR
Bedrock
11/12/2018
<0.1
<5
<0.2
<0.5
4.1
0.057
6.5
NA
2640
<0.1
2.6
3.6 j
NA
NA
NA
NA
NA
NA
<5
0.12
0.058
AL-04BRL
Bedrock
02/12/2018
<0.1
55.5
<0.2
2
<0.5
<0.05
<0.5
NA
338
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.33
<0.05
AL-04BRL
Bedrock
05/14/2018
<0.1
13.6
<0.2
3.2
1.2
<0.05
<0.5
NA
428
<0.1
0.45
<10
NA
NA
NA
NA
NA
NA
54.7
0.35 SI
0.025 j
AL-04BRL
Bedrock
08/13/2018
0.049j
<5
<0.2
2.8
0.38j
<0.05
<0.5
NA
873
<0.1
0.34
<10
NA
NA
NA
NA
NA
NA
173
0.33
<0.05
AL-04BRL
Bedrock
11/12/2018
<0.1
18.6
<0.2
1.3 B
<0.5
0.03 j
<0.5
NA
377
<0.1
<0.3
2.5 j
NA
NA
NA
NA
NA
NA
47.1
0.36
0.063
AL-04D
Transition Zone
02/08/2018
<0.1
64.2
<0.2
1.7
12.2
0.054
13.5
NA
7050
<0.1
3
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
AL-04D
Transition Zone
05/11/2018
<0.1
1 52.6
<0.2
2.5
8.4
<0.05
7.6
NA
3600
0.045 j
3.4
10.2
NA
NA
NA
NA
NA
NA
<5
0.14
0.025 j
AL-04D
Transition Zone
08/13/2018
<0.1
<250
<0.2
1.4
11.4
0.037j
13.1
NA
5640
0.029j
3
<500
NA
NA
NA
NA
NA
NA
<5
0.098j
0.046j
AL-04D
Transition Zone
11/12/2018
<0.1
26.8
<0.2
1.3 B
7.5
0.042 j
9.9
NA
4050
<0.1
2.6
8.6 j
NA
NA
NA
NA
NA
NA
<5
0.11
0.04 j
BG-01BRA
Bedrock
02/09/2018
0.18
30
<0.2
1.2
2.8
0.12
<0.5
NA
187
<0.1
19.4
<10
0.423
1.94
2.363
<0.0005
<0.0005
NA
<5
0.27
0.13
BG-0IBRA
Bedrock
05/11/2018
0.18
12.7
<0.2
0.75
1.8 S1
0.096
0.26j
NA
168
<0.1
18
<10
0.583 U
1.68
2.26
0.00013j
0.00013j
0.000084j
<5
0.31
0.099
BG-01BRA
Bedrock
08/10/2018
<0.1
7.7
<0.2
0.45j
1.3
0.11
0.29j
NA
161
<0.1
17.7
<10
0.687
1.94
2.63
<0.0005
<0.0005
<0.0005
<5
0.29
0.13
BG-01BRA
Bedrock
11/08/2018
<0.1
2.8 j
<0.2
0.31 j
1.3
0.11
<0.5
NA
167
<0.1
16.5
2.6 j
0.225 U
1.23
1.46 U
NA
<0.0005
NA
<5
0.28
0.11
BG-01D
Transition Zone
02/09/2018
<0.1
14.4
<0.2
<0.5
5.8
0.11
2
NA
696
<0.1
3.6
<10
0.58
0.983
1.563
<0.0005
<0.0005
NA
<5
0.26
0.1
BG-OSD
Transition Zone
05/11/2018
<0.1
6.3
<0.2
0.2 j
5.8
0.053
2.5
NA
585
<0.1
3.4
<10
1.1
1.57
2.67
0.0002 j
0.0002 j
0.00014 j
<5
0.28 M1
0.056
BG-01D
Transition Zone
08/10/2018
<0.1
<5
<0.2
0.2j
5
0.069
2.4
NA
170
<0.1
3.4
<10
0.925
1.34
2.27
0.00017j
0.00017j
0.00016j
<5
0.28
0.08
BG-OSD
Transition Zone
11/08/2018
<0.1
6.9
<0.2
0.19 j
5.1
0.063
1.9
NA
628
<0.1
3.4
4.4 j
0.902 U
1.1
2
NA
0.00016 j
NA
<5
0.23
0.065
BG-01S
Saprolite
02/09/2018
<0.1
6.2
<0.2
<0.5
5.9
<0.05
<0.5
NA
161
<0.1
<0.3
<10
-0.122
0.242
0.12
<0.0005
<0.0005
NA
<5
<0.1
<0.05
BG-01S
Saprolite
05/11/2018
0.029 j
5.1
<0.2
<0.5
3 SI
<0.05
<0.5
NA
108
<0.1
0.15 j,SI
<10
-0.061 U
0.32 U
0.32 U
<0.0005
<0.0005
<0.0005
<5
0.051 j
<0.05
BG-01S
Saprolite
08/10/2018
<0.1
5.7
<0.2
<0.5
2.2
0.027 j
<0.5
NA
68.8
<0.1
<0.3
1 <10
0.169 U
0.558 U
0.727 U
<0.0005
<0.0005
<0.0005
<5
0.06 j
0.04 j
BG-01S
Saprolite
11/08/2018
<0.1
7.7
<0.2
<0.5
3
<0.05
<0.5
NA
96
<0.1
0.39
<10
0.575 S3
0.766
1.34
NA
<0.0005
NA
<5
<0.1
<0.05
BG-02BR
Bedrock
02/09/2018
<0.1
<5
<0.2
<0.5
0.94 SI
0.2
<0.5
NA
244
<0.1
14.4
<10
1.26
3.87
5.13
<0.0005
<0.0005
NA
<5
0.28
0.2
BG-02BR
Bedrock
05/11/2018
<0.1
<5
<0.2
0.17j
0.98 S3
0.2
0.18j
NA
251
<0.1
14.4
<10
1.18
3.98
5.16
0.000065j
0.000065j
0.000054j
<5
0.28
0.21
BG-02BR
Bedrock
08/10/2018
<0.1
<5
<0.2
0.22 j
0.94
0.18
<0.5
NA
210
<0.1
13.9
<10
1.15
5.28
6.43
<0.0005
<0.0005
<0.0005
<5
0.27
0.18
BG-02BR
Bedrock
11/08/2018
<0.1
<5
<0.2
0.17 j
0.96
0.2
<0.5
NA
225
<0.1
13.2
3.4 j
0.901 SI
2.56
3.46
NA
0.000062 j
NA
<5
0.27
0.2
BG-02S
Saprolite
02/09/2018
0.1
<5
<0.2
<0.5
2.9
0.15
<0.5
NA
136
<0.1
6.4
<10
0.186
0.579
0.765
<0.0005
<0.0005
NA
<5
0.32
0.18
BG-02S
Saprolite
05/11/2018
<0.1
<5
<0.2
0.13 j
3.8
0.16
0.26 j
NA
196
<0.1
8.9
<10
0.502 U
0.6 U
1.1 U
0.000046 j
0.000046 j
0.000035 j
<5
0.46
0.16
BG-02S
Saprolite
08/10/2018
<0.1
<5
<0.2
0.07 j
3.4
0.17
0.2 j
NA
159
<0.1
7.8
<10
0.163 U
0.928
1.09 U
<0.0005
<0.0005
<0.0005
<5
0.45
0.17
BG-02S
Saprolite
11/08/2018
<0.1
<5
<0.2
<0.5
3.7
0.17
<0.5
NA
162
<0.1
7.4
5 j
0.629 S1
1.26
1.89
NA
<0.0005
NA
<5
0.41
0.18
BG-03BR
Bedrock
02/09/2018
<0.1
<5
<0.2
1.9
3.1
0.54
<0.5
NA
181
<0.1
14.7
<10
0.0664
0.486
0.5524
<0.0005
<0.0005
NA
<5
1
0.56
BG-03BR
Bedrock
05/11/2018
<0.1
<5
<0.2
1.9
3.1 S1
0.51
0.18j
NA
166
<0.1
15.2
<10
0.0615 U
0.828
0.89 U
0.000098j
0.000098j
0.000096j
<5
1.1
0.58
BG-03BR
Bedrock
08/10/2018
<0.1
<5
<0.2
1.7
3
0.54
0.23j
NA
168
<0.1
15.1
<10
0.479 U
1.74
2.22
0.00012j
0.00012j
<0.0005
<5
1.1
0.59
BG-03BR
Bedrock
11/08/2018
<0.1
<5
<0.2
1.7
3.4
0.59
<0.5
NA
164
<0.1
14.9
<10
0.367 U
0.703
1.07 U
NA
0.00015 j
NA
<5
1.1
0.64
BG-03D
Bedrock
02/09/2018
<0.1
<5
<0.2
<0.5
4.9
1.1
<0.5
NA
163
<0.1
25.5
<10
0.379
-0.0073
0.3717
<0.0005
<0.0005
NA
<5
1.7
1.1
BG-03D
Bedrock
1 05/11/2018
<0.1
<5
<0.2
0.21 j
4.8
1
<0.5
NA
151
<0.1
25.4
<10
0.429 U
0.839
1.27
1 0.000046 j
0.000046 j
0.000041 j
<5
1.8 M1
1.1
Page 18 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
FIELD PARAMETERS
WATER QUALITY PARAMETERS
SELECTED 40CFR257 APPENDIX III CONSTITUENTS plus Sr
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
PH
Water
Level
Temp
Spec
Cond
DO
ORP
Eh
Turbidity
Alkalinity
Bi-
carbonate
Alkalinity
Sulfide
Total
Organic
Carbon
Total
Suspended
Solids
Boron
Calcium
Chloride
Strontium
Sulfate
Total
Dissolved
Solids
Aluminum
Antimony
Arsenic
Barium
Beryllium
Cadmium
Chromium
(VI)
Chromium
Cobalt
Reporting Units
S.U.
ft
Deg C
pmhos/cm
mg/L
mV
mV
NTUs
mg/L
mg/L
mg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
6.5-8.5
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
700
NE
250
NE
250
Soo
NE
1*
10
700
4*
2
10
10
1*
Background Threshold Values (Shallow Unit)
4.6-6.4
NE
NE
NE
NE
NE
NE
NE
63
63
0.1
1
NE
50
10.7
5.5
303
4.2
140
757
0.5
0.4
310
0.2
0.08
5.7
16.5
1.2
Background Threshold Values (Deep Unit)
5.7-6.9
NE
NE
NE
NE
NE
NE
NE
204
204
0.1
1
NE
50
13.1
4.7
665
17.7
183
128
0.5
0.6
127
0.1
0.08
3
7.6
1.9
Background Threshold Values (Bedrock Unit)
5.6-7.6
NE
NE
NE
NE
NE
NE
I NE
1 108
1 108
1 0.1
1
NE
50
15
1 4.5
253
18.4
216
300
0.5
0.6
435
1 0.2
0.08
3.9
1 8.3
2.8
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
BG-03D
Bedrock
08/10/2018
6.5
27.25
26
230
3.10
70
275
1.2
102
102
<0.1
0.52j
<2.5
<50
10.6
2.6
160
11.3
180
<100
<0.5
0.36
802
<0.1
<0.08
4.9
5.4
0.047j
BG-03D
Bedrock
11/08/2018
6.6
27.06
16
233
4.90
127
332
0.8
108
108
<0.1
<1
<2.5
<50
10.6
2.6
160
10.6
181
<100
<0.5
0.34
821
<0.1
<0.08
5.3
4.9 BC,S1
0.027j
BG-03S
Saprolite
02/09/2018
6.2
30.30
8
164
3.20
77
282
9.4
65.7
65.7
<0.1
<1
<2.5
<501g
5.97
2.3
138
10.2
137
696
<0.5
0.46
605
<0.1
<0.08
3.3
9.9
0.5
BG-03S
Saprolite
05/11/2018
6.3
27.36
27
125
3.90
114
319
2.4
53.3
53.3
<0.1
<1
<2.5
<50
4.64
1.5
127
7.2
104 S3
189 S3
<0.5
0.2 S3
316
<0.1
<0.08
7
9.4
0.23
BG-03S
Saprolite
08/10/2018
6.2
28.43
27
125
4.40
150
355
2.5
50.4
50.4
<0.1
0.57 j
<2.5
<50
4.86
1.4
126
7.4
122
582
<0.5
0.15
329
<0.1
<0.08
6.8
9.8
0.27
BG-03S
Saprolite
11/08/2018
6.3
27.23
14
128
4.20
79
284
2.7
59.6
59.6
<0.1
<1
<5
<50
5.51
1.8
124
8.5
125
138
<0.5
0.18
462
<0.1
<0.08
5.5 M6
6.8 BC,SI
0.13
GWA-01BR
Bedrock
02/07/2018
6.3
41.92
9
202
5.10
17
222
1.1
38.6
38.6
<0.1
<1
<2.6
<50
15.4
2.9
265
43.1
153
<100
<0.5
0.1
38.3
<0.1
<0.08
2.3 M6
2.6 S1
0.79
GWA-01BR
Bedrock
05/14/2018
6.2
41.62
19
202
4.20
51
256
2.7
37.3
37.3
<0.1
<1
<5
<50
16.1
3
271
48.4
152
<100
<0.5
0.1
35.7
<0.1
<0.08
2.5
3.7 SI
0.88
GWA-01BR
Bedrock
08/08/2018
6.3
41.21
30
211
3.20
122
327
3.6
37.2
37.2
<0.1
<1
<2.5
<50
17.3
3.2
273
53.4
159
76.1 j
<0.5
<0.1
37
<0.1
<0.08
2
3.1
0.83
GWA-01BR
Bedrock
11/06/2018
6.4
41.09
18
201
4.70
-99
106
3.1
38.6
38.6
<0.1
<1
<2.5
<50
16.9
3
271
50.2
155
<100
<0.5
0.095 j
37.1
<0.1
<0.08
2.6
2.5 SI
0.8
GWA-01D
Transition Zone
02/07/2018
6.6
44.46
9
549
0.80
56
261
9.6
52.4
52.4
<0.1
<1
4.2
<50
56.5
2.2
972
192
436
270
<0.5
0.15
56.6
<0.1
<0.08
<0.025
5.5
0.35
GWA-011)
Transition Zone
05/14/2018
6.3
43.52
22
575
0.10
45
250
9.5
44.4
44.4
<0.1
<1
5.6
<50
58.5
2.2
869
215
439
254 Sl
<0.5
0.15
54
<0.1
<0.08
<0.025
0.61 Sl
0.39
GWA-01D
Transition Zone
08/14/2018
6.5
43.20
23
575
0.40
34
239
3.4
44.3
44.3
<0.1
<1
<5
<50
65.2
2.4
881
217
444
<100
0.22 j
0.27
47.6
<0.1
<0.08
<0.025
0.85
0.3
GWA-01D
Transition Zone
11/06/2018
6.7
43.23
18
575
1.60
-68
137
7.3
46.1
46.1
<0.1
<1
8.2 D6
<50
62.9
2.4
875
221
429
354
0.32j
0.6
47.6
0.035j
<0.08
<0.025
0.81 B,S1
0.38
GWA-01S
Saprolite
02/07/2018
5.4
45.26
9
64
4.90
152
357
7.5
9.3
9.3
<0.1
<1
4.8
<50
1.11
2.9
33.6
7
59
464
0.61
0.16
49.1
0.67
<0.08
0.38 SI
1.7 S1
0.62
GWA-01S
Saprolite
05/14/2018
5.3
44.25
24
68
4.10
78
283
9.3
7.9
7.9
<0.1
0.5 j
3
<50
1.08
2.8
32.6 Sl
9.5
56
328 Sl
<0.5
0.092 j
47
0.68
<0.08
0.62 MI
1.1 Sl
0.7
GWA-01S
Saprolite
08/08/2018
5.2
44.14
26
65
4.10
215
420
9.8
9.9
9.9
<0.1
<1
<2.5
<50
1.17
3
35.2
8.9
60
166
<0.5
0.09 j
47.7
0.82
<0.08
0.34
0.7 B
0.59
GWA-01S
Saprolite
11/06/2018
5.4
44.07
18
67
4.80
-51
154
2.8
7.2
7.2
<0.1
<1
<5
<50
1.25
2.9
33
9
54
<100
<0.5
<0.1
52
0.69
<0.08
0.48 Ml
0.76 B,S3
0.49
GWA-02DA
Transition Zone
02/08/2018
11.1
27.33
8
370
0.70
-334
7129
3.1
131
<5
3.7 M6
2.2
3.3
<50
12.6
2.9
535
21.4
206 Sl
133
<0.5
0.42 SI
49.4
<0.1
<0.08
<0.025
1.6 S1
<0.1
GWA-02DA
Transition Zone
05/14/2018
11.9
25.88
25
3208
0.40
-249
-44
1.1
672
<5
0.38
13.2
4.3
40.2 j, Sl
41.4
3.4
2250
28.1
690
1880
<0.5
0.62
206
<0.1
<0.08
0.18 S1
0.83 Sl
0.047j
GWA-02DA
Transition Zone
08/08/2018
10.3
41.38
20
263
4.36
301
506
2.6
95.6
41.3
<0.1
0.96 j
9.4
<50
9.27
1.6
429
12.8
179
203
0.7
<0.1
46.2
<0.1
<0.08
3.6
4.1
0.043 j
GWA-02DA
Transition Zone
11/07/2018
10.3
24.96
18
228
4.60
-34
172
6.0
124
<5
<0.1
1.4
4.8
<50
8.99
1.7
466
12
169
200
0.66
0.27 Sl
49.4
<0.1
<0.08
4.7
5
0.045 j,S1
GWA-02S
Saprolite
02/08/2018
5.3
28.13
7
58
5.90
53
258
4.6
<5
<5
<0.1
<1
<2.5
<50
2.84
<1
11.9
13.8
36 S1
<100
<0.5
<0.1
47.3
0.11
<0.08
1.4
1.7 S1
<0.1
GWA-02S
Saprolite
05/14/2018
5.1
26.32
23
102
6.40
-48
157
2.7
1.8 j
1.8 j
<0.1
<1
<2.5
<50
5.03
0.56 j,MI
29.3 Sl
30.1 Ml
67
304 Sl
<0.5
0.062 j
107
0.14
<0.08
2.6
7.3
0.68
GWA-02S
Saprolite
08/08/2018
5.7
27.82
22
37
7.29
392
597
2.9
6.2
6.2
<0.1
<1
<2.5
<50
1.6
0.63 j
8.6
7.8
32
<100
<0.5
<0.1
32.5
0.12
<0.08
1.1
1.2 B
0.04 j
GWA-02S
Saprolite
11/07/2018
5.0
25.10
18
317
6.90
115
320
8.5
2.9j
2.9j
<0.1
0.73j
<2.5
<50
20.2
3.6
68.4
117
203
222
<0.5
0.33 SI
120
0.25
0.082
4.2
4.6
4
GWA-03D
Transition Zone
02/09/2018
6.3
6.37
14
97
5.70
170
375
3.5
47.2
47.2
<0.1
<1
<5
<50 1g
8.39
1.8
69
2.2
88
<100
<0.5
<0.1
30.4
<0.1
<0.08
0.33
0.62 S1
<0.1
GWA-03D
Transition Zone
05/15/2018
6.2
6.36
22
99
4.30
184
389
1.4
45.3
45.3
<0.1
<1
<2.5
<50
9.07
1.9
65.7
2
92
79 j
<0.5
0.074 j
30.5
<0.1
<0.08
0.34
0.45 j,S1
0.058 j
GWA-03D
Transition Zone
08/09/2018
6.1
615.00
19
99
4.60
46
251
2.4
45.4
45.4
<0.1
<1
<2.5
<50
8.86
2.1
65.4
2.3
105
<100
<0.5
0.081 j,S1
29.4
<0.1
<0.08
0.34
0.44 j,SI
<0.1
GWA-03D
Transition Zone
11/07/2018
6.3
6.02
17
103
4.90
96
301
2.3
47.7
47.7
<0.1
<1
<2.5
1 <50
8.82
2.1
67.2
2.5
103
<100
1 <0.5
0.1 Sl
30.9
<0.1
<0.08
0.35 Sl
0.78 Sl
0.12 Sl
GWA-03S
Saprolite
02/09/2018
5.3
8.70
14
46
5.00
141
346
3.6
21.4
21.4
<0.1
<1
<2.5
<501g
2.81
2
39.7
1.1
52
<100
<0.5
<0.1
28
0.11
<0.08
0.26
<0.5
<0.1
GWA-03S
Saprolite
05/15/2018
5.6
8.76
19
69
5.40
-46
159
2.4
28.7
28.7
<0.1
<1
<2.6
<50
4.21
1.8
46.8
0.53 j
77
62.6 j
<0.5
0.049 j
34.7
<0.1
<0.08
0.32
0.43 j,S1
<0.1
GWA-03S
Saprolite
08/09/2018
5.6
8.48
21
57
3.80
221
426
2.8
23.4 M1
23.4
<0.1
<1
3.2
<50
3.29
2.3
38.3
0.65 j
70
207
<0.5
0.071 j,S1
33.6
0.1
0.035 j
0.31
0.43 j,S1
0.098 j
GWA-03S
Saprolite
11/07/2018
5.6
8.38
18
56
4.00
93
298
5.8
24.6
24.6
<0.1
<1
3.3
<50
3.4
2.2
40.7
0.78 j
69
124
<0.5
0.081 j,S1
31.9
0.1
<0.08
0.42
0.83 S3
0.064 j,S1
GWA-04D
Transition Zone
02/06/2018
7.4
58.99
15
278
0.40
-80
125
1.1
140
140
<0.1
1.9
<2.7
<50
31
3.1
145
8.5
189
<100
<0.5
0.78
26
<0.1
<0.08
<0.025
<0.5
<0.1
GWA-04D
Transition Zone
05/10/2018
7.5
62.92
27
289
1.00
-10
195
1.4
139
139
<0.1
2.6
<2.5
43j
31.3
3.2
146
8.9
179
<100
<0.5
0.77 S1
29.8
<0.1
<0.08
0.26 S1
0.84 S1
0.066j
GWA-04D
Transition Zone
08/09/2018
7.5
59.00
30
295
0.80
-52
153
0.5
134
134
<0.1
1.1
<2.5
<50
32.7
3.4
136
7.6
174
<100
0.14 j
0.96
27.5
<0.1
<0.08
0.083
0.26 j,S1
0.022 j
GWA-04D
Transition Zone
11/07/2018
7.4
58.32
14
277
2.00
56
261
0.6
149
149
<0.1
1.2
<2.5
<50
31.9
3.3
137
7.2
180
<100
<0.5
0.8 S1
28.3
0.014j
<0.08
0.17
0.48 j,S1
0.031 j,S1
GWA-04S
Saprolite
02/06/2018
5.8
59.04
14
57
4.80
54
259
6.4
12.9
12.9
<0.1
<1
<2.5
<50
3.03
3.5
39.8
<1
59
152
<0.5
<0.1
33.1
<0.1
<0.08
0.83
1.3
<0.1
GWA-04S
Saprolite
05/10/2018
5.7
58.98
26
57
7.97
478
683
4.7
13.2
13.2
<0.1
<1
3.3
56.7
3.14
3.5
39
<1
57
295
<0.5
0.049 j,S1
31.4
<0.1
<0.08
1.2
IA SI
0.041 j
GWA-04S
Saprolite
08/09/2018
5.6
59.15
28
58
4.90
59
264
8.1
13
13
<0.1
<1
5.2
<50
3.11
4
39.3
<1
58
348
<0.5
0.1 B,S1
36.3
0.081 j
<0.08
1 M6
1.2 S1
0.053 j
GWA-04S
Saprolite
11/07/2018
5.8
Below Pump
18
62
5.50
49
254
5.0
13.6
13.6
<0.1
<1
<2.5
<50
3.2
3.9
42.2
<1
66
59.9 j
<0.5
1.7
31.5
0.03 j
<0.08
1.1
1.6 S1
0.057 j,S1
GWA-05D
Transition Zone
02/06/2018
6.5
37.29
14
47
6.40
31
236
0.0
14
14
<0.1
<1
<2.5
<50
2.44
1.3
81
2.4
75
<100
<0.5
0.11
15.1
<0.1
<0.08
0.41 MI
0.55
<0.1
GWA-05D
Transition Zone
05/14/2018
6.2
37.27
23
51
4.40
91
296
0.1
12.4
12.4
<0.1
<1
<2.5
<50
2.54
1.7
81.9 S3
2.6
58
<100
<0.5
0.13
17.5
<0.1
<0.08
0.45
0.64 Sl
<0.1
GWA-05D
Transition Zone
08/07/2018
6.0
37.06
27
48
5.00
-47
158
0.6
12.8
12.8
<0.1
<1
<5
<50
2.54
1.5
86.1
2.5
68
<100
<0.5
0.1
17.8
<0.1
<0.08
0.46
0.56 S1
<0.1
GWA-05D
Transition Zone
11/09/2018
6.4
37.25
14
48
5.50
155
360
0.6
14
14
<0.1
<1
<2.5
<50
2.6
1.5
90
2.7
65
<100
<0.5
0.1
19.7
<0.1
<0.08
0.38 SI
0.59
<0.1
GWA-06D
Bedrock
02/09/2018
6.4
44.32
15
131
1.50
15
220
4.4
53.2
53.2
<0.1
<1
<5
<50
8.33
3.1
246
9.4
105
185
<0.5
0.18
28.4
<0.1
<0.08
0.7
IA Sl
1.4
GWA-06D
Bedrock
05/14/2018
6.2
43.39
17
173
1.10
-21
184
0.4
56.7
56.7
<0.1
0.66 j
<2.5
<50
9.32
3.1
254
9.8
108
<100
<0.5
0.18
25.2
<0.1
<0.08
0.18 S1
0.4 j,S1
3.9
GWA-06D
Bedrock
08/13/2018
6.4
44.06
19
124
2.40
57
262
1.7
49.8
49.8
<0.1
<1
<2.5
<50
9.38
3.1
226
7.1
103
50.3 j
0.11 j
0.16
26.4
<0.1
<0.08
0.8
IA SI
0.33
GWA-06D
Bedrock
11/08/2018
6.1
43.60
16
128
2.10
64
269
0.6
57.3
57.3
<0.1
<1
<2.5
<50
10
3.4
223
8.9
105
<100
<0.5
0.16
24.1
<0.1
<0.08
1.2
1.3 B,S3
0.19
GWA-065
Saprolite
02/09/2018
5.9
43.86
16
48
5.00
264
469
9.1
17.2
17.2
<0.1
<1
4.8
<50
2.34
2.8
54.4
<1
48
334
<0.5
0.62
59.2
<0.1
<0.08
0.49
1.1 sl
<0.1
GWA-06S
I Saprolite
05/14/2018
5.8
42.87
20
49
5.70
101
1 306
8.6
14.8
14.8
<0.1
<1
<2.5
<50
2.48
2.8
55.6 S3
<1
51
339 S3
<0.5
0.25
59
0.12
<0.08
0.31
0.54 Sl
0.053 j
Page 19 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
Copper
Iron
Lead
Lithium
Magnesium
Manganese
Mercury
Molybdenum
Nickel
Nitrate
+ Nitrite
Potassium
Selenium
Sodium
Thallium
Vanadium
Zinc
Aluminum
(0.45u)
Antimony
(0.45u)
Arsenic
(0.45u)
Barium
(0.45u)
Beryllium
(0.45u)
Boron
(0.45u)
Cadmium
(0.45u)
Chromium
(0.45u)
Cobalt
(0.45u)
Copper
(0.45u)
Iron
(0.45u)
Reporting Units
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
mg-N/L
mg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
1000
300
15
NE
NE
50
1
NE
100
NE
NE
20
NE
0.2*
0.3*
1000
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Shallow Unit)
3.8
744
0.3
NE
1.8
75.3
0.2
0.5
9.9
2.7
5
0.5
9.1
0.1
5.6
19.2
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Deep Unit)
2.8
272
0.1
NE
14.4
141
0.2
3.2
7.5
1.4
7.8
0.5
29.2
0.1
3.8
17
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Bedrock Unit)
4.2
792
0.2
NE
1 13.2
26.6
0.2
3
7.2
1 0.4
9.8
0.5
14
1 0.1
16
11.9
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
BG-03D
Bedrock
08/1O/2018
0.26 j,S1
<50
<0.1
7.3
13.7
<5
<0.2
0.16 j
4.6
0.39
7.54
0.19 j
13.7
<0.1
25.3
2.8 j,B,SI
<100
<0.5
0.34
702
<0.1
26.6 j
<0.08
5.1
0.026 j
1.3 S1
<50
BG-03D
Bedrock
11/08/2018
0.29 j,S1
<50 BC
<0.1
7.1
14
<5
<0.2
0.2 j
4.6
0.36
7.71
<O.5
13.6
<0.1
23.6
6.2 j,B
<100
<0.5
0.33
696
<0.1
<50
<0.08
4.6
0.023 j
0.7 SI
<50
BG-03S
Saprolite
02/09/2018
1.5 SS
858
0.1
5.6
9.72
12.4
<0.2
<0.5
13.7
0.19
<5
<0.5
7.76
<0.1
9.1
<10
<100
<0.5
0.23
562
<0.1
<50
<0.08
5
<0.1
0.75 SI
<50
BG-03S
Saprolite
05/11/2018
0.81
216
0.047 j,SI
3.5
7.23
3.6 j
<0.2
0.13 j,S1
10.3
0.027
3.87 j
<0.5
6.37
<0.1
5.5
2.8 j
<100
<0.5
0.23
420
<0.1
<50
<0.08
6.2
0.027 j
1.1 SI
<50
BG-03S
Saprolite
08/1O/2018
1.2 SI
710
0.093 j
3.6
7.81
7.6
<0.2
<0.5
10.3
0.088
3.82 j
<0.5
7.06
<0.1
4.6
31.6 SI
<100
<0.5
0.1
413
<0.1
<50
<0.08
8.4
0.089 j
1.6 SI
<50
BG-03S
Saprolite
11/08/2018
0.64 SI
150 B,BC
<0.1
4.4 B
8.46
<5
<0.2
<0.5
9.9
0.095
4.05 j
<0.5
7.72
<0.1
6.5
5.2 j,B
<100
<0.5
0.21
408
<0.1
<50
<0.08
6
0.043 j
1.3 S1
<50
GWA-OIBR
Bedrock
02/07/2018
0.52 SI
<50
<0.1
6.4
5.54
<5
<0.2
<0.5
<0.5
0.62
<5
<0.5
10.1
<0.1
4.1
<10
<100
<0.5
0.14
35.1
<0.1
<50
<0.08
2.6
0.87
<0.5
<50
GWA-01BR
Bedrock
05/14/2018
0.71 SI
60.8
<0.1
5.9 sl
5.92
3.2 j
<0.2
0.13 j
1.1 SI
0.65
2.63 j
0.46 j
10.6
<0.1
4
<10
<100
<0.5
0.12
31.2
<0.1
<50
<0.08
2.5
0.84
0.4 j,S1
<50
GWA-OIBR
Bedrock
08/08/2018
0.73 SI
151
0.041 j
6.7
5.82
3.9 j
<0.2
0.62
0.43 j
0.67
2.63 j
0.75
10.1
<0.1
4.2
3.4 j,B
<100
<0.5
<0.1
34.3
<0.1
<50
<0.08
2.6 S1
0.89
0.51 SS
<50
GWA-01BR
Bedrock
11/06/2018
0.38 j,S1
48.8 j
<0.1
5.7
5.72
<5
<0.2
<0.5
<0.5
0.64
2.56 j
0.41 j
10.3
<0.1
4
<10
<100
<0.5
0.076 j
34.4
<0.1
<50
<0.08
2.3
0.77
0.68 S1
<50
GWA-01D
Transition Zone
02/07/2018
1.4 SI
290
0.16
29
19.7
47.7
<0.2
9.3
6.7
<0.02
10.1
<0.5
17.5
<0.1
0.54
<10
<100
<0.5
0.12
42.2
<0.1
<50
<0.08
<0.5
0.32
<0.5
69.5
GWA-01D
Transition Zone
05/14/2018
0.47 j,S1
395
0.1 SI
13.8
22.7
60.5
<0.2
7.7
3.4 SI
<0.02
5.84
<0.5
17.6
<0.1
0.43SI
5.4 j,S1
<100
<0.5
0.13
38.3
<0.1
<50
<0.08
0.13 j,S1
0.31
0.14 j,S1
61.1
GWA-01D
Transition Zone
08/14/2018
0.26 j
91.1
<0.1
15.9
21.6
49.2
<0.2
13.9
3.8
<0.02
6.06
<0.5
17.5
<0.1
0.5
4 j
<100
0.093 j
0.26
44.5
<0.1
<50
<0.08
0.26 j
0.32
0.22 j
53.7
GWA-01D
Transition Zone
11/06/2018
1.7 SI
410
0.23
16.4
21.6
47.5
<0.2
14.4
3.8
<0.02
6.51
<0.5
17.4
<0.1
1 Si
11.3
<100
<0.5
0.11
38.6
0.021 j
<50
<0.08
0.24 j,B,SI
0.26
0.26 j,SI
61.6
GWA-01S
Saprolite
02/07/2018
2 SI
426
0.24
1.4
0.301
23.1
<0.2
<0.5
1.2 SI
0.6
<5
1.3
9.54
<0.1
0.48
<SO
<100
<0.5
0.12
42.2
0.73
<50
<0.08
1.3
0.63
0.94 SI
69
GWA-01S
Saprolite
05/14/2018
0.87 SI
586
0.21 SI
1.1 SI
0.335
29.9
<0.2
<0.5
0.63 SI
0.62
<5
1.5
10.2
<0.1
0.51 Si
6.2 j,S1
<100
<0.5
0.08 j
37.5
0.6
<50
<0.08
0.76 SI
0.62
1.7 S1
<50
GWA-01S
Saprolite
08/08/2018
0.61 SI
242
0.14
1.3 S1
0.341
18
<0.2
<0.5
0.36 j
0.66
<5
1.6
9.79
<0.1
0.3 j
6.8 j,B
<100
<0.5
<0.1
41.9
0.74
<50
<0.08
0.46 j,S1
0.56
2 S1
<50
GWA-01S
Saprolite
11/06/2018
1.1 SI
34.8 j
<0.1
1.2 j
0.338 B,BC
11.5
<0.2
<0.5
<0.5
0.63
<5
1.3
10.1
<0.1
0.2 j,S1
5.2 j
<100
<0.5
<0.1
43.8
0.7
<50
<0.08
0.73 B,S1
0.48
2
<50
GWA-02DA
Transition Zone
02/08/2018
<0.5
91.1
<0.1
77.1
0.565
7.8
<0.2
2.4 S1
1.3 S1
<0.02
21.6
<0.5
41.2
<0.1
1.6
<10
<100
<0.5
0.5
41.6
<0.1
<50
<0.08
<0.5
<0.1
<0.5
<50
GWA-02DA
Transition Zone
05/14/2018
0.63SI
52.8
0.048 j,SI
651
0.169
4.2 j
<0.2
5.1
1.3SI
<0.02
162
0.47 j
181
<0.1
8.4
2.6 j,S1
1520
<0.5
0.7
155
<0.1
29.1 j
<0.08
0.42 j,S1
<0.1
0.19 j,S1
<50
GWA-02DA
Transition Zone
08/08/2018
0.47 j,S1
59.2
0.12
81.4
0.427
5.8
<0.2
2.1
0.55
0.084
21.4
0.34 j
26.6
0.038 j
12
3.1 j,B
57.8 j,S1
0.72
OA SI
43.1
<0.1
<50
<0.08
3.8 S1
0.024 j
0.23 j,S1
<50
GWA-02DA
Transition Zone
11/07/2018
0.52 SI
66
0.12
86
0.508
5.9
<0.2
1.2 SI
0.65
0.099
26.9
<0.5
30.2
<0.1
10.5
<10
78 j
0.49 j
0.22
39.1
<0.1
<50
<0.08
4.2
0.017 j
0.28 j,BC,SI
<50
GWA-02S
Saprolite
02/08/2018
0.74 SI
<50
<0.1
0.6
2.92
11.4
<0.2
<0.5
<0.5
0.021
<5
<0.5
<5
<0.1
<0.3
<10
<100
<0.5
<0.1
45.7
0.12
<50
<0.08
1.7
<0.1
0.61 SI
<50
GWA-02S
Saprolite
05/14/2018
0.6 51
III
<0.1
0.48 j,S1
4.64
39.7
<0.2
<0.5
5
<0.02
<5
0.59
1.92 j
0.14
<0.3
4.5 j,S1
<100
<0.5
0.052 j
79.6
0.12
<50
<0.08
6.5
0.44
0.7 S1
<50
GWA-02S
Saprolite
08/08/2018
1.4
34.4 j
<0.1
0.61 S1
1.47
5.6
<0.2
<0.5
0.28 j
<0.02
<5
0.17 j
2.04 j
0.089 j
<0.3
4.6 j,B
<100
<0.5
0.047 j,S1
33.4
0.079 j
<50
<0.08
1.4 SI
0.022 j
0.24 j,S1
<50
GWA-02S
Saprolite
11/07/2018
0.84 SI
144
<0.1
1.1 j
19.4
219
<0.2
<0.5
2.4
2
3.53 j
2.7
1.38 j
0.11
0.53
12.4
75.7 j
<0.5
0.34
108
0.25
<50
0.073 j
3.8
3.5
1.5 BC,SI
<50
GWA-03D
Transition Zone
02/09/2018
<0.5
<50
<0.1
3.7
1.73
5.5
<0.2
2.4
<0.5
0.2
<5
<0.5
7.41
<0.1
1
<10
<100
<0.5
<0.1
32.3
<0.1
<50
<0.08
0.62 SI
<0.1
<0.5
<50
GWA-03D
Transition Zone
05/15/2018
0.43 j,S1
54.8
0.055 j
4
1.93
23.9
<0.2
2.4
0.32 j,SI
0.19
<5
<0.5
7.95
<0.1
1.1
<10
<100
<0.5
<0.1
27.4
<0.1
<50
<0.08
0.48 j
0.029 j
0.23 j
<50
GWA-03D
Transition Zone
08/09/2018
0.14 j
<50
<0.1
4.3
1.84
3.4 j
<0.2
2.4
0.16 j
0.18
<5
<0.5
7.59
<0.1
1.1
3.1 j,S1
<100
<0.5
0.065 j,SI
30
<0.1
<50
<0.08
0.45 j,S1
<0.1
0.62 SI
<50
GWA-03D
Transition Zone
11/07/2018
0.81 SI
72.1
<0.1
3.6
1.87
16.2
<0.2
2.6
0.57 SI
0.17
<5
<0.5
7.69
<0.1
1.1
4.3 j,B
<100
<0.5
0.53 SI
27.3
<0.1
<50
<0.08
0.88 B,SI
0.012 j
0.29 j,S1
<50
GWA-03S
Saprolite
02/09/2018
<0.5
117 SI
<0.1
1.1
1.25
7
<0.2
<0.5
<0.5
0.22
<5
<0.5
<5
<0.1
0.32S1
<10
<100
<0.5
<0.1
29
<0.1
55.5
<0.08
<0.5
<0.1
<0.5
<50
GWA-03S
Saprolite
05/15/2018
<0.5
69.1
<0.1
1.8
1.12
3.3 j
<0.2
0.31 j
<0.5
0.5
<5
<0.5
7.82
<0.1
0.61
<10
<100
<0.5
<0.1
29.1
<0.1
<50
<0.08
0.44 j
<0.1
0.47 j
<50
GWA-03S
Saprolite
08/09/2018
0.38 j
217
0.1
1.8 B
1.2
27.1
<0.2
0.19 j
0.19 j
0.29
<5
<0.5
5.88
<0.1
0.51
4.8 j,S1
<100
<0.5
0.06 j,S1
29
0.091 j,S1
<50
0.036 j
0.47 j,S1
0.087 j,S1
0.54 SI
<50
GWA-03S
Saprolite
11/07/2018
0.92 SI
190
0.12
1.5 j
1.21
11
<0.2
0.3 j,SI
<0.5
0.34
<5
<0.5
6.19
<0.1
0.9
5.6 j,B
<100
<0.5
0.17
26
0.085 j
<50
<0.08
0.61 B,SI
0.029 j
0.72 SI
<50
GWA-04D
Transition Zone
02/06/2018
<0.5
<50
<0.1
3.6
5.24
110
<0.2
4.3
<0.5
<0.02
<5
<0.5
18.9
<0.1
0.8
<10
<100
<0.5
0.89
26.2
<0.1
<50
<0.08
<0.5
<0.1
0.71
<50
GWA-04D
Transition Zone
05/1O/2018
0.17 j,S1
53.9 SI
<0.1
3.4
5.21
133
<0.2
4.3
0.45 j
0.057
3.49 j
0.17 j
21.8
<0.1
1.1
<10
<100
<0.5
0.83
28.3
<0.1
26.5 j
<0.08
<0.5
0.051 j
<0.5
<50
GWA-04D
Transition Zone
08/09/2018
0.63
<50
<0.1
4.1
5.49
28.2
<0.2
4.4
0.51
0.018 j
3.35 j
<0.5
16.6
<0.1
1.8
5.21. B,SI
<100
0.15 j
0.86
26.6
<0.1
<50
<0.08
1.5 SI
0.072 j,S1
0.47 j,S1
<50
GWA-04D
Transition Zone
11/07/2018
0.82 SI
<50
<0.1
3.6
5.28
42.7
<0.2
4.4
1
<0.02
3.44 j
<0.5
17
<0.1
1.1
3.1 j,B
<100
<0.5
0.7
24.6
<0.1
<50
<0.08
0.95 B,S1
0.036 j
0.26 j,S1
80.2
GWA-04S
Saprolite
02/06/2018
1.2
345
<0.1
0.82
0.878
9.4
<0.2
<0.5
<0.5
1.8
<5
<0.5
5.16
<0.1
<0.3
<10
<100
<0.5
<0.1
30.8
<0.1
<50
<0.08
1
<0.1
0.53
<50
GWA-04S
Saprolite
05/1O/2018
0.45 j,S1
431 S3
0.034 j
0.96 SI
0.885
11.8
<0.2
0.14 j,S1
0.3 j
1.4
<5
<0.5
5.3
<0.1
0.28 j,S1
2.7 j
<100
<0.5
<0.1
28.2
<0.1
60.8
<0.08
1.2
0.032 j
2.7 SI
<50
GWA-04S
Saprolite
08/09/2018
0.42 j
612
<0.1
0.74
1
15.8
<0.2
0.093 j
0.26 j
1.8
<5
<0.5
5.24
<0.1
0.29 j
5.2 j,B,SI
<100
<0.5
0.092 j,S1
31.3
0.043 j,S1
<50
<0.08
IA SI
<0.1
0.3 j,S1
<50
GWA-04S
Saprolite
11/07/2018
0.76 SI
123
<0.1
0.79 j
0.889
6.4
<0.2
0.32 j,S1
2.5
1.5
<5
<0.5
5.26
<0.1
0.51
3.6 j,B
<100
<0.5
<0.1
26.6
0.034 j
<50
<0.08
IA SI
0.014 j
0.44 j,S1
<50
GWA-0513
Transition Zone
02/06/2018
<0.5
<50
<0.1
3.1
0.75
<5
<0.2
<0.5
<0.5
0.72
<5
<0.5
<5
<0.1
1.4
<10
<100
<0.5
0.13
16.5
<0.1
<50
<0.08
0.63
<0.1
0.59
<50
GWA-05D
Transition Zone
05/14/2018
0.3 j,S1
<50
0.05 j,51
3.2 SI
0.775
<5
<0.2
0.3 j
<0.5
0.71
<5
<0.5
4.95 j
<0.1
1.6
<10
404
<0.5
0.097 j
17.8
<0.1
62.3
<0.08
0.58 SI
<0.1
1.2 SI
<50
GWA-0513
Transition Zone
08/07/2018
0.32 j,B,SI
<50
<0.1
3 B
0.74
<5
<0.2
0.33 j
<0.5
0.76
<5
<0.5
5.17
<0.1
1.5
3.4 j,B,SI
<100
<0.5
0.11
16
<0.1
<50
<0.08
0.56
<0.1
1.8 S1
<50
GWA-05D
Transition Zone
11/09/2018
0.32 j
<50
<0.1
2.5
0.765
<5
<0.2
0.33 j
<0.5
0.74
<5
<0.5
4.97 j
<0.1
1.5
<10
<100
<0.5
0.086 j
20.6
<0.1
<50
<0.08
0.56 SI
<0.1
0.51 SI
<50
GWA-06D
Bedrock
02/09/2018
1 S1
348
<0.1
7.4
2.19
53.4
<0.2
<0.5
1 S1
0.18
<5
<0.5
12.1
<0.1
1.8
<10
<100
<0.5
0.16
25.4
<0.1
<50
<0.08
0.82 S1
0.25
<0.5
<50
GWA-06D
Bedrock
05/14/2018
0.3 j,S1
50.2
0.27 51
5.7 SI
2.59
208
<0.2
0.8
1.2 SI
0.13 S1
<5
<0.5
13.1
<0.1
1.5
2.5 j,S1
<100
<0.5
0.2
20.7
<0.1
<50
<0.08
0.27 j,S1
3.8
<0.5
<50
GWA-06D
Bedrock
08/13/2018
0.65 B,S1
91
<0.1
6
2.25
16
<0.2
0.75
0.77 SI
0.16
2.55 j
<0.5
12.3
<0.1
1.5
3.2 j,B
<100
<0.5
0.17
20
<0.1
<50
<0.08
1.2
0.2
0.53 B
<50
GWA-06D
Bedrock
11/08/2018
0.52 SI
39 j
<0.1
5.4
2.27
12.7
<0.2
0.76
0.89
0.14
<5
<0.5
13
<0.1
1.5
3.4 j,B
<100
<0.5
0.13
21.3
<0.1
<50
<0.08
1.2 SI
0.24
0.31 j,S1
<50
GWA-06S
Saprolite
02/09/2018
741
438
196
0.67 B
0.532
12.3
<0.2
<0.5
2.4 S1
0.11
<5
<0.5
5.18
<0.1
0.57 S3
<10 B
<100
<0.5
0.5
58.4
<0.1
<50
<0.08
0.9 S1
<0.1
<0.5
<50
GWA-06S
Saprolite
OS/14/2018
0.36 j,S1
362
0.2 SI
0.6 SI
0.598
9.8
<0.2
<0.5
0.28 j,51
0.1 S1
<5
<0.5
5.66
<0.1
0.5 Si
3.7 j,S1
<100
<0.5
0.21
50.3
0.096 j
<50
<0.08
0.44 j,Sl
0.031 j
0.4 j,51
<50
Page 20 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
RADIONUCLIDES
OTHER PARAMETERS
Lead
(0.45u)
Manganese
(0.45u)
Mercury
(0.45u)
Molybdenum
(0.45u)
Nickel
(0.45u)
Phosphorus
(0.45u)
Selenium
(0.45u)
Silver
(0.45u)
Strontium
(0.45u)
Thallium
(0.45u)
Vanadium
(0.45u)
Zinc
(0.45u)
Radium-226
Radium-228
Total
Radium
Uranium-238
Total
Uranium
Uranium-238
DIS
Carbonate
Alkalinity
Fluoride
Phosphorus
Reporting Units
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pCi/L
pCi/L
pCi/L
ug/mL
ug/mL
ug/mL
mg/L
mg/L
mg/L
15A NCAC 02L Standard
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5A
NE
0.03A
NE
NE
2
NE
Background Threshold Values (Shallow Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
3
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Deep Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
2.8
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Bedrock Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5.7
NE
0.0005
NE
5
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
BG-03D
Bedrock
08/10/2018
<0.1
<5
<0.2
0.16 j
4.6
1.1
<0.5
NA
140
<0.1
25.8
<10
0.702
0.913 U
1.62
<0.0005
<0.0005
<0.0005
<5
1.8
1.1
BG-03D
Bedrock
11/08/2018
<0.1
<5
<0.2
0.21 j
4.6
1.1
<0.5
NA
145
<0.1
23
4.1 j
0.418 U
0.31 U
0.728 U
NA
<0.0005
NA
<5
1.8
1.1
BG-03S
Saprolite
02/09/2018
<0.1
<5
<0.2
<0.5
9.9
0.36
<0.5
NA
131
<0.1
8.4
<10
0.308
0.236
0.544
<0.0005
<0.0005
NA
<5
0.65
0.35
BG-03S
Saprolite
05/11/2018
<0.1
<5
<0.2
0.11 j
12.5
0.22
<0.5
NA
116
<0.1
7.1
3.8 j
0.448 U
0.637
1.09
<0.0005
<0.0005
<0.0005
<5
0.48
0.17
BG-03S
Saprolite
08/10/2018
0.049 j
<5
<0.2
<0.5
12.6
0.23
<0.5
NA
109
<0.1
7
3.2 j,B
0.244 U
0.998 U
1.24 U
<0.0005
<0.0005
<0.0005
<5
0.44
0.27
BG-03S
Saprolite
11/08/2018
<0.1
<5
<0.2
<0.5
9.9
0.27
<0.5
NA
112
<0.1
7
8.9 j
0.667 U
0.431 U
1.1 U
NA
<0.0005
NA
<5
0.51
0.3
GWA-01BR
Bedrock
02/07/2018
<0.1
<5
<0.2
<0.5
<0.5
0.1
<0.5
NA
254
<0.1
4.2
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.086
GWA-01BR
Bedrock
05/14/2018
<0.1
<5
<0.2
0.092j
1.1
0.079
0.43j
NA
242
<0.1
4
<10
0 U
0.672 U
0.672 U
0.00012j
0.00012j
0.00004j
<5
0.08 j,S1
0.11
GWA-01BR
Bedrock
08/08/2018
<0.1
<5
<0.2
0.25 j,S1
0.26 j,S1
0.08
0.7 S1
NA
253
<0.1
4.3
<10
0.133 U
1.27
1.4
0.00013j
0.00013j
0.00011j
<5
0.096j
0.086
GWA-01BR
Bedrock
11/06/2018
<0.1
<5
<0.2
<0.5
<0.5
0.091
0.36 j
NA
252
<0.1
3.8
3 j
0.301 U
0.401 U
0.702 U
NA
0.00011 j
NA
<5
0.097 j
0.093
GWA-01D
Transition Zone
02/07/2018
<0.1
51.6
<0.2
8.7
3.6
<0.05
<0.5
NA
808
<0.1
<0.3
<10
1.36
1.99 B,S1
3.35
<0.0005
<0.0005
NA
<5
0.15
<0.05
GWA-01D
Transition Zone
05/14/2018
<0.1
47.8
<0.2
7.5
3
<0.05
<0.5
NA
766
<0.1
0.25 j
<10
1.46
0.653 U
2.11
0.0001 j
0.0001 j
0.000043 j
<5
0.16 S3
0.027 j
GWA-01D
Transition Zone
08/14/2018
<0.1
46.5
<0.2
12.5
3.5
0.041 j
<0.5
NA
799
<0.1
0.4
<10
1.03
1.29 B
2.32
0.0001 j
0.0001 j
<0.0005
<5
0.17
0.056
GWA-01D
Transition Zone
11/06/2018
<0.1
42.3
<0.2
11
3.1
0.029 j
<0.5
NA
768
<0.1
0.18 j
3.6 j
0.648
0.563 U
1.21 U
NA
0.00014 j
NA
<5
0.2
0.035 j
GWA-01S
Saprolite
02/07/2018
<0.1
20.8
<0.2
<0.5
0.89
<0.05
1.3
NA
31.3
<0.1
<0.3
<10
-0.11
0.845
0.735
<0.0005
<0.0005
NA
<5
<0.1
<0.05
GWA-01S
Saprolite
05/14/2018
<0.1
22.9
<0.2
<0.5
0.66
<0.05
1.3
NA
31.7
<0.1
0.066 j
5.2 j
-0.3 U
0.534 U
0.534 U
0.00005 j
0.00005 j
<0.0005
<5
<0.1
<0.05
GWA-01S
Saprolite
08/08/2018
0.04 j
14.9
<0.2
<0.5
0.44 j,SI
<0.05
1.2 SI
NA
31
<0.1
0.058 j
6.4 j
0.336 U
0.729 U
1.07 U
<0.0005
<0.0005
<0.0005
<5
<0.1
<0.05
GWA-01S
Saprolite
11/06/2018
<0.1
11.2
<0.2
<0.5
0.76
<0.05
1.3
NA
32.4
<0.1
0.15 j
10.8
1.02
0.62 U
1.64 U
NA
<0.0005
NA
<5
<0.1
<0.05
GWA-02DA
Transition Zone
02/08/2018
<0.1
<5
<0.2
2.9
0.76
0.15
<0.5
NA
443
<0.1
1.6
<10
NA
NA
NA
NA
NA
NA
130
0.14
0.13
GWA-02DA
Transition Zone
05/14/2018
<0.1
<5
<0.2
6
1.1
<0.05
0.38 j
NA
1760
<0.1
10.3
<10
NA
NA
NA
NA
NA
NA
446
0.17 S1
0.0443
GWA-02DA
Transition Zone
08/08/2018
<0.1
<5
<0.2
2
0.29 j,S1
0.23
0.25 j,S1
NA
405
0.029j
12.2
<10
NA
NA
NA
NA
NA
NA
54.3
0.17
0.24
GWA-02DA
Transition Zone
11/07/2018
<0.1
3.1 j
<0.2
1
<0.5
0.15
<0.5
NA
392
<0.1
9.7
<10
NA
NA
NA
NA
NA
NA
106
0.14
0.15
GWA-02S
Saprolite
02/08/2018
<0.1
8.7
<0.2
<0.5
0.72
<0.05
<0.5
NA
11.4
<0.1
<0.3
<10
-0.06
0.475
0.415
<0.0005
<0.0005
NA
<5
<0.1
<0.05
GWA-02S
Saprolite
05/14/2018
<0.1
24.8
<0.2
<0.5
5
<0.05
0.46 j
NA
22.5
0.12
<0.3
3.3 j
0 U
0.446 U
0.446 U
<0.0005
<0.0005
<0.0005
<5
<0.1 M1
<0.05
GWA-02S
Saprolite
08/08/2018
<0.1
4.7 j
<0.2
<0.5
0.18 j,S1
<0.05
0.35 j,S1
NA
8.6
0.093 j
<0.3
4.9 j
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
GWA-02S
Saprolite
11/07/2018
<0.1
198
<0.2
<0.5
2
<0.05
2.7
NA
63.1
0.12
0.16 j,B,SI
13 S1
NA
NA
NA
NA
NA
NA
<5
0.062 j
<0.05
GWA-03D
Transition Zone
02/09/2018
<0.1
<5
<0.2
2.5
<0.5
0.065
<0.5
NA
72.4
<0.1
1.2
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.065
GWA-03D
Transition Zone
05/15/2018
<0.1
4.4 j
<0.2
2.5
0.26 j
0.064
<0.5
NA
62.4
<0.1
1.1
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.065
GWA-03D
Transition Zone
08/09/2018
<0.1
<5
<0.2
2.2
0.13 j,S1
0.089
<0.5
NA
65.8
<0.1
0.87
<10
NA
NA
NA
NA
NA
NA
<5
0.05 j
0.087
GWA-03D
Transition Zone
11/07/2018
<0.1
<5
<0.2
2.3
<0.5
0.073
<0.5
NA
65.2
<0.1
1.1
<10
NA
NA
NA
NA
NA
NA
<5
0.05 j
0.07
GWA-03S
Saprolite
02/09/2018
<0.1
5.6
<0.2
<0.5
<0.5
<0.05
<0.5
NA
43.3
<0.1
0.32
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
GWA-03S
Saprolite
05/15/2018
<0.1
<5
<0.2
0.28 j
0.18 j
<0.05
<0.5
NA
41.4
<0.1
0.48
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.048 j
GWA-03S
Saprolite
08/09/2018
<0.1
23.6
<0.2
0.17 j
0.18 j,S1
0.053
<0.5
NA
36.6
<0.1
0.21 j,S1
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.061
GWA-03S
Saprolite
11/07/2018
<0.1
6.7
<0.2
0.26 j
<0.5
0.046 j
<0.5
NA
37.2
<0.1
0.63 B,S1
3.6 S1
NA
NA
NA
NA
NA
NA
<5
<0.1
0.0473
GWA-04D
Transition Zone
02/06/2018
<0.1
63
<0.2
4.8
0.81
<0.05
<0.5
NA
126
<0.1
1.3
<10
NA
NA
NA
NA
NA
NA
<5
0.12
<0.05
GWA-04D
Transition Zone
05/10/2018
<0.1
71.5
<0.2
4.9
0.85 B,S1
<0.05
<0.5
NA
133
<0.1
1.4 B
<10
NA
NA
NA
NA
NA
NA
<5
0.12
<0.05
GWA-04D
Transition Zone
08/09/2018
<0.1
13.7
<0.2
4.4
3.8
0.026 j
<0.5
NA
125
<0.1
1.9
3.4 j
NA
NA
NA
NA
NA
NA
<5
0.11
0.035 j
GWA-04D
Transition Zone
11/07/2018
<0.1
30.1
<0.2
4.2
1.5
<0.05
<0.5
NA
128
<0.1
1.1
4.3 S3
NA
NA
NA
NA
NA
NA
<5
0.12
<0.05
GWA-04S
Saprolite
02/06/2018
<0.1
<5
<0.2
<0.5
<0.5
<0.05
<0.5
NA
37.5
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
GWA-04S
Saprolite
05/10/2018
<0.1
3.1 j
<0.2
0.16 j
1.2 S1
<0.05
<0.5
NA
36.2
<0.1
0.11 j
3.9 j
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
GWA-04S
Saprolite
08/09/2018
<0.1
<5
<0.2
0.12 j
0.16 j,S1
0.037 j
<0.5
NA
36.3
<0.1
0.14 j,S1
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.041 j
GWA-04S
Saprolite
11/07/2018
<0.1
<5
<0.2
0.12 j
<0.5
<0.05
<0.5
NA
35.8
<0.1
0.3 j,B,S1
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.025 j
GWA-05D
Transition Zone
02/06/2018
<0.1
<5
<0.2
<0.5
<0.5
0.12
<0.5
NA
72.9
<0.1
1.5
<10
NA
NA
NA
NA
NA
NA
<5
0.14
0.11
GWA-05D
Transition Zone
05/14/2018
<0.1
<5
<0.2
0.33 j
<0.5
0.12
<0.5
NA
87.4
<0.1
1.5
10
NA
NA
NA
NA
NA
NA
<5
0.17 S1
0.11
GWA-05D
Transition Zone
08/07/2018
<0.1
<5
<0.2
0.32 j
<0.5
0.12
<0.5
NA
75.4
<0.1
1.4
2.7 j,B
NA
NA
NA
NA
NA
NA
<5
0.16
0.11
GWA-05D
Transition Zone
11/09/2018
<0.1
<5
<0.2
0.3 j
<0.5
0.12 M1
<0.5
NA
81.6
<0.1
1.3
3.6 j,S1
NA
NA
NA
NA
NA
NA
<5
0.15
0.12
GWA-06D
Bedrock
02/09/2018
<0.1
12.9
<0.2
0.68
151
<0.05
<0.5
NA
238
<0.1
1.4
<10
0.398
0.617
1.015
<0.0005
<0.0005
NA
<5
<0.1
0.054
GWA-06D
Bedrock
05/14/2018
<0.1
161
<0.2
0.88
1.2
<0.05
<0.5
NA
223
<0.1
1.4
3j
0.556 U
0.556 U
1.11 U
0.000083j
0.000083j
0.000044j
<5
0.086 j,S1
0.034j
GWA-06D
Bedrock
08/13/2018
<0.1
9.4
<0.2
0.82
0.81
0.041 j
<0.5
NA
198
<0.1
1.3
<10
0.133 U
-0.102 U
0.133 U
<0.0005
<0.0005
<0.0005
<5
0.077 j
0.026 j
GWA-06D
Bedrock
11/08/2018
<0.1
13.3
<0.2
0.64
0.82
0.042 j
<0.5
NA
203
<0.1
1.5
<10
0.103 U
-0.0681 U
0.103 U
NA
0.0000873
NA
<5
0.08 j
0.04 j
GWA-06S
Saprolite
02/09/2018
<0.1
7.6
<0.2
<0.5
0.62 SI
<0.05
<0.5
NA
54.4
<0.1
0.43
<10
0.203
0.0251
1 0.2281
1 <0.0005
<0.0005
NA
<5
<0.1
<0.05
GWA-06S
Saprolite
25/14/2018
<0.1
5 j
<0.2
<0.5
0.5 j
<0.05
<0.5
NA
49.9
<0.1
0.35
2.7 j
0.135 U
0.595 U
1 0.73 U
1 0.000094 j
0.000094 j
<0.0005
<5
<0.1
<0.05
Page 21 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
FIELD PARAMETERS
WATER QUALITY PARAMETERS
SELECTED 40CFR257 APPENDIX III CONSTITUENTS plus Sr
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
PH
Water
Level
Temp
Spec
Cond
DO
ORP
Eh
Turbidity
Alkalinity
Bi-
carbonate
Alkalinity
Sulfide
Total
Organic
Carbon
Total
Suspended
Solids
Boron
Calcium
Chloride
Strontium
Sulfate
Total
Dissolved
Solids
Aluminum
Antimony
Arsenic
Barium
Beryllium
Cadmium
Chromium
(VI)
Chromium
Cobalt
Reporting Units
S.U.
ft
Deg C
Nmhos/cm
mg/L
mV
mV
NTUs
mg/L
mg/L
mg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
pg/L
pg/L
Ng/L
pg/L
Ng/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
6.5-8.5
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
700
NE
250
NE
250
Soo
NE
1*
10
700
4*
2
10
10
1*
Background Threshold Values (Shallow Unit)
4.6-6.4
NE
NE
NE
NE
NE
NE
NE
63
63
0.1
1
NE
50
10.7
5.5
303
4.2
140
757
0.5
0.4
310
0.2
0.08
5.7
16.5
1.2
Background Threshold Values (Deep Unit)
5.7-6.9
NE
NE
NE
NE
NE
NE
NE
204
204
0.1
1
NE
50
13.1
4.7
665
17.7
183
128
0.5
0.6
127
0.1
0.08
3
7.6
1.9
Background Threshold Values (Bedrock Unit)
5.6-7.6
NE
NE
I NE
I NE
NE
NE
NE
108
108
0.1
1
NE
50
15
1 4.5
253
18.4
1 216
1 300
1 0.5
0.6
435
1 0.2
t0.08
3.9
1 8.3
2.8
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
GWA-06S
Saprolite
08/13/2018
5.5
43.55
25
51
6.40
-47
159
6.9
16.8
16.8
<0.1
<1
3.1
<50
2.7
2.9
57.6
<1
57
185
<0.5
0.073 j
63.8
0.11
<0.08
0.98
5.9
0.13
GWA-06S
Saprolite
11/08/2018
5.9
43.08
16
48
6.80
170
375
9.0
20.9
20.9
<0.1
<1
<2.5
<50
2.64
2.9
57.2
<1
53
306
<0.5
0.074 j
61.5
0.11
<0.08
0.2
0.42 j,B,S1
0.06 j
GWA-07D
Transition Zone
02/12/2018
6.5
11.52
16
184
4.50
50
255
3.1
83.7
83.7
<0.1
<1
<2.5
<50
8.41
2.6
186
8.3
137 D6
<100
<0.5
0.16
370
<0.1
<0.08
5.4
6
0.1
GWA-07D
Transition Zone
05/14/2018
6.4
9.85
22
188
2.80
77
282
6.7
77.4
77.4
<0.1
<1
<2.5
<50
8.75
2.6
188
9
129
214 Sl
<0.5
0.2
348
<0.1
<0.08
6.8
6.2
0.48
GWA-07D
Transition Zone
08/10/2018
6.4
10.21
21
187
3.60
-196
9
2.8
79.3
79.3
<0.1
<1
<2.5
<50
8.72
2.6
193
9.1
139
99.2 j
<0.5
0.14
356
<0.1
<0.08
6.4
6.1
0.12
GWA-07D
Transition Zone
11/07/2018
6.5
9.41
18
182
3.20
122
327
2.1
84.5
84.5
<0.1
<1
<2.5
<50
8.31
2.7 M1
183
9.1 Ml
134
<100
<0.5
0.19 Sl
337
<0.1
<0.08
6.1
5.4
0.22
GWA-07S
Saprolite
02/12/2018
6.5
11.10
16
158
4.10
147
352
7.8
66.3
66.3
<0.1
<1
<2.5
<50
7.17
4.6
156
7.9
110
<100
<0.5
0.15
166
<0.1
<0.08
1.3
2.9 Sl
5.7
GWA-07S
Saprolite
05/14/2018
6.3
10.35
21
191
1.50
75
280
9.5
75.9
75.9
<0.1
0.74 j
<2.5
30.9 j,S1
9.64
3.7
191
12.2
126
<100
<0.5
0.22
223
<0.1
<0.08
2.5
4.7
7.2
GWA-07S
Saprolite
08/10/2018
6.3
10.57
24
202
0.40
100
305
8.1
83.2
83.2
<0.1
<1
<2.5
<50
10.3
3.5
228
14.2
131
<100
<0.5
0.12
288
<0.1
<0.08
2.3
5.1
11.5
GWA-07S
Saprolite
11/07/2018
6.4
9.20
19
206
0.70
-42
163
6.2
83.6
83.6
<0.1
<1
<2.5
<50
9.61
3.9
215
11.5
125
<100
<0.5
0.17 SI
271
<0.1
<0.08
0.088
2.9 SI
30
GWA-08D
Bedrock
02/08/2018
6.5
38.66
15
85
5.80
66
271
3.4
39.9
39.9
<0.1
<1
9.2
<50
6.4
2.9
177
<1
74 Sl
204
<0.5
0.38 Sl
33.4
<0.1
<0.08
0.49
0.84 Sl
<0.1
GWA-081)
Bedrock
05/14/2018
6.4
37.71
26
89
4.00
93
298
4.8
34
34
<0.1
<1
<2.5
<50
6.12
2.7
174
<1
77
215 SI
<0.5
0.19
32.4
0.047 j
<0.08
0.39
1.2 SI
0.09 j
GWA-08D
Bedrock
08/07/2018
6.2
37.14
29
97
3.80
121
326
5.1
36.8
36.8
<0.1
<1
<2.5
<50
6.47
2.7
177
<1
84
145
<0.5
0.16
29.9
<0.1
<0.08
0.4
0.73 51
0.075 j
GWA-0813
Bedrock
11/09/2018
6.1
37.37
11
85
5.20
76
281
2.5
41
41
<0.1
<1
<2.5
<50
6.33
2.7
182
<1
97
61.6 j
<0.5
0.14
30.8
<0.1
<0.08
0.38 S1
0.88
0.062 j
GWA-08S
Saprolite
02/08/2018
6.3
36.73
16
77
6.10
220
425
9.5
32.8
32.8
<0.1
<1
10.4
<50
6.13
4.1
165
<1
65 SI
678
<0.5
<0.1
26.8
<0.1
<0.08
0.72
IA SI
0.11
GWA-08S
Saprolite
05/14/2018
5.8
36.01
22
93
6.40
-45
160
3.2
29
29
<0.1
<1
<2.5
<50
7.3
5.4
205
4.1
76
109 SI
<0.5
0.057 j
25.8
<0.1
<0.08
0.97
13.1
0.15
GWA-08S
Saprolite
08/07/2018
5.8
35.28
28
92
6.00
-31
175
1.1
32.4
32.4
<0.1
<1
<2.5
<50
7.41
4.7
209
4.6
73
<100
<0.5
<0.1
24.1
<0.1
<0.08
1.5
4 B
0.068 j
GWA-08S
Saprolite
11/09/2018
6.2
35.57
11
86
6.50
146
351
1.5
35.5
35.5
<0.1
<1
7.4
<50
6.62
4.7
196
2.2
83
399
<0.5
0.13
27.3
0.04 j
<0.08
0.88 Sl
2.1
0.19
GWA-09BR
Bedrock
02/12/2018
6.5
1.52
14
106
4.30
49
254
1.5
40.3
40.3
<0.1
<1
<2.5
<50
9.04
4.1
47.4
<1
86
<100
<0.5
<0.1
16
<0.1
<0.08
0.61
0.98 S1
<0.1
GWA-09BR
Bedrock
05/14/2018
6.3
0.87
17
107
5.90
-72
134
1.3
38.2
38.2
<0.1
<1
<2.6
<50
9.01
4.2
52.7 Sl
0.54 j
92
<100
<0.5
0.065 j
15.5
<0.1
<0.08
0.68 MI
0.75 SI
<0.1
GWA-09BR
Bedrock
08/09/2018
6.5
1.15
22
108
3.80
118
323
1.8
40.3
40.3
<0.1
<1
<2.5
<50
8.78
4.5
52.2
0.61 j
105
<100
<0.5
0.075 j,S1
15.7
<0.1
<0.08
0.67 MI
0.81 Sl
<0.1
GWA-09BR
Bedrock
11/08/2018
6.5
0.70
16
107
4.60
110
315
1.0
43.4
43.4
<0.1
0.65 j
<2.5
<50
9.03
4.3
53.6
0.55 j
102
<100
<0.5
0.041 j
18
<0.1
<0.08
0.6
0.77 B,S1
<0.1
GWA-SOD
Transition Zone
02/12/2018
6.8
10.53
15
560
0.40
-46
159
2.0
64.1
64.1
<0.1
<1
<2.5
<50
51
1.3
1630
211
415
<100
<0.5
<0.1
67.4
<0.1
<0.08
<0.025
0.57 Sl
0.27
GWA-lOD
Transition Zone
05/14/2018
6.8
10.36
17
569
0.40
-25
180
5.2
59.8
59.8
<0.1
<1
<2.5
<50
52.4
1.3 M1
1670
207
415
<100
<0.5
0.078 j
62.4
<0.1
<0.08
<0.025 P4,R0
0.37 j,B,SI
0.32
GWA-10D
Transition Zone
08/13/2018
6.8
10.55
19
580
0.50
-15
190
1.0
61.1
61.1
<0.1
<1
<2.5
<50
54
1.4
1830
220
435
<100
<0.5
0.079 j
67
<0.1
<0.08
<0.025
0.28 j,S1
0.29
GWA-lOD
Transition Zone
11/08/2018
6.8
10.32
17
559
0.40
-80
125
0.8
65
65
<0.1
<1
<2.5
<50
52.1
1.4
1730
235
423
<100
0.18 j
0.36
61.2
0.11
<0.08
<0.025
0.5 j,B,Sl
0.28
GWA-10S
Saprolite
02/12/2018
5.8
12.73
15
207
2.30
176
381
9.7
26.9
26.9
<0.1
<1
7.3
73.8
13.3
1.5
802
57.3
153
621
<0.5
0.39
66.2
0.11
<0.08
1.3
3 S1
0.18
GWA-10S
Saprolite
05/14/2018
5.7
12.61
18
195
1.90
3
208
8.4
25
25
<0.1
<1
5.5
88.8 SS
13
1.6
767
58.5
140
497 S1
<0.5
0.25
55.4
0.11
<0.08
1.3
1.8 S1
0.084 j
GWA-10S
Saprolite
08/13/2018
5.8
13.06
19
187
1.30
-39
166
8.5
26.4
26.4
<0.1
<1
4.3
92
12.5
1.7
769
57.2
146
293
<0.5
0.23
56.8
0.13
<0.08
1.7
2.3
0.11
GWA-10S
Saprolite
11/08/2018
5.7
12.55
17
195
1.00
94
299
8.7
29.1
29.1
<0.1
<1
4.9
126
13.5
1.8
817
59.8
159
354
<0.5
0.26
62.2
0.12
<0.08
1.5
2 S1
0.24
GWA-11BR
Bedrock
02/07/2018
7.8
46.90
13
280
0.60
-132
73
8.2
98.9
98.9
0.14
<1
2.9
<50
28.9
3.2
542
39.9
206
209
0.95
0.12
52.2
<0.1
<0.08
<0.025
1.5 SS
<0.1
GWA-11BR
Bedrock
05/11/2018
7.5
45.66
20
281
0.50
-98
107
5.8
92.6
92.6
0.18
<1
3.1
<50
24.6
3.7
569
45.9
179 SI
169 SI
1.6
0.17 S1
49.2
<0.1
<0.08
<0.025
2.1
0.058j
GWA-11BR
Bedrock
08/08/2018
7.5
45.67
24
310
0.70
-250
-45
9.7
104
104
<0.1
<1
18.3
<50
32.5
3.7
592
53
212
264
0.39j
0.14
56.4
<0.1
<0.08
<0.025
2.1
0.14
GWA-11BR
Bedrock
11/07/2018
7.6
46.15
15
301
0.70
-85
121
2.7
110
110
<0.1
<1
7.1
<50
29.4
3.9
572
51.7
206
99.2j
0.5
0.12 S1
51.5
<0.1
<0.08
<0.025
2.4 S1
0.076 j,S1
GWA-11D
Transition Zone
02/07/2018
5.9
47.86
12
363
1.00
67
272
9.6
48.7
48.7
<0.1
<1
<2.5
1140
36.8
4.3
1670
96.4
271
163
<0.5
<0.1
120
<0.1
<0.08
1.9
2.4 S1
0.16
GWA-11D
Transition Zone
05/11/2018
5.9
46.58
22
359
0.80
107
312
7.6
45.2
45.2
<0.1
<1
4.1
997
32.8
5
1610
114
265 Sl
281 Sl
0.14j
0.17 S1
106
0.059j
<0.08
2.4
2.7
0.22
GWA-11D
Transition Zone
08/08/2018
5.9
46.69
19
364
1.40
69
274
9.7
44.3
44.3
<0.1
<1
46.1
1070
35.4
5.4
1660
118
282
544
<0.5
0.16
105
0.053j
<0.08
1.7
2.9
0.18
GWA-111)
Transition Zone
11/07/2018
6.0
47.00
16
358
1.30
15
220
2.1
47.6
47.6
<0.1
<1
<2.5
1070
35.1
5.6
1670
114
279
<100
<0.5
0.074 j,S1
90.7
0.035j
<0.08
1.9
2.3 S1
0.087 j,S1
GWA-11S
Saprolite
02/07/2018
5.4
46.98
12
640
1.40
77
282
9.2
22.2
22.2
<0.1
<1
3.7
2910
64.5
4.5
1080
223
499
719
<0.5
0.17
64.1
0.19
0.25
0.23 S1
0.69 S1
0.28
GWA-11S
Saprolite
05/11/2018
5.3
45.86
25
637
1.40
-75
130
4.0
20.5
20.5
<0.1
<1
<2.5
2740
59
5.1
1110
261
478 S1
84.3 j,S1
<0.5
0.23 S1
52.6
0.18
0.23
0.23
1.1 S1
0.24
GWA-11S
Saprolite
08/08/2018
5.3
46.06
22
646
2.60
136
341
5.2
22
22
<0.1 R1
<1
2.7
2740
63
6.1
1070
284
489
194
<0.5
0.17
52
0.17
0.23
0.2
0.41j
0.27
GWA-11S
Saprolite
11/07/2018
5.4
46.13
15
646
2.10
80
285
7.5
21.9
21.9
<0.1
<1
<2.6
2730
63.5
6.7
1090
286
500
88 j
<0.5
0.12 S1
50.2
0.16
0.25
0.2
0.57 S1
0.24
GWA-12BR
Bedrock
02/08/2018
6.7
20.50
14
126
0.30
58
263
5.0
37.5
37.5
<0.1
<1
<2.5
<50
6.43
1.4
187
19.4
107 SI
<100
<0.5
0.53
30.1
<0.1
<0.08
0.094
0.67 S1
1.2
GWA-12BR
Bedrock
05/10/2018
6.5
18.14
19
126
0.30
37
242
9.4
31.7
31.7
<0.1
<1
22.8
<50
6.18
1.5
180
20
116
322
<0.5
0.68 Sl
31.4
<0.1
<0.08
<0.025
0.46 j,S1
1.8
GWA-12BR
Bedrock
08/09/2018
6.4
18.27
20
125
0.50
87
292
6.1
31.5
31.5
<0.1
<1
<5
25.9 j,B
6.54
1.6
168
22.1
117
<100
<0.5
0.21 B,S1
25.6
<0.1
<0.08
0.026
0.31 j,S1
0.79
GWA-12BR
Bedrock
11/08/2018
6.5
17.76
17
127
0.40
3
208
8.6
35.5
35.5
<0.1
<1
<2.5
<50
6.72
1.6
185
22.3
109
<100
<0.5
0.18
31.6
<0.1
<0.08
<0.025
0.23 j,B,Sl
1.7
GWA-12D
Bedrock
02/08/2018
10.5
12.40
12
254
1.60
55
260
8.0
NA
NA
NA
NA
NA
<50
NA
NA
NA
12.2
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-12D
Bedrock
05/10/2018
9.6
17.30
30
241
0.60
22
227
9.2
NA
NA
NA
NA
NA
<50
NA
NA
NA
10.5
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-12D
Bedrock
08/09/2018
10.2
16.43
29
301
2.50
-51
154
8.8
NA
NA
NA
NA
NA
<50
NA
NA
NA
10.3
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-12D
Bedrock
11/08/2018
10.1
17.08
18
283
0.40
7
212
8.1
NA
1
NA
NA
NA
NA
<50
NA
NA
NA
11
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-12S
Saprolite
02/08/2018
5.4
19.71
14
43
2.60
179
384
4.3
<5
<5
<0.1
<1
<2.5
<50
0.287
2.4
10.7
8
37 51
102 S1
<0.5
0.16 S1
51.4
<0.1
<0.08
0.83
IA S1
0.71
GWA-12S
Saprolite
05/10/2018
5.3
17.41
22
34
3.60
79
1 284
0.3
2.5 j
2.5 j
<0.1
<1
<2.5
<50
0.246
2.1
11.5
3.4
10
66.6 j
<0.5
0.065 j,S1
49.4
0.052 j
F <0.08
0.51 Sl
0.73 Sl
0.26
Page 22 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
Copper
Iron
Lead
Lithium
Magnesium
Manganese
Mercury
Molybdenum
Nickel
Nitrate
+ Nitrite
Potassium
Selenium
Sodium
Thallium
Vanadium
Zinc
Aluminum
(0.45u)
Antimony
(0.45u)
Arsenic
(0.45u)
Barium
(0.45u)
Beryllium
(0.45u)
Boron
(0.45u)
Cadmium
(0.45u)
Chromium
(0.45u)
Cobalt
(0.45u)
Copper
(0.45u)
Iron
(0.45u)
Reporting Units
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
mg-N/L
mg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
1000
300
15
NE
NE
50
1
NE
100
NE
NE
20
NE
0.2*
0.3*
1000
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Shallow Unit)
3.8
744
0.3
NE
1.8
75.3
0.2
0.5
9.9
2.7
5
0.5
9.1
0.1
5.6
19.2
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Deep Unit)
2.8
272
0.1
NE
14.4
141
0.2
3.2
7.5
1.4
7.8
0.5
29.2
0.1
3.8
17
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Bedrock Unit)
4.2
792
0.2
NE
13.2
26.6
0.2
3
7.2
1 0.4
1 9.8
1 0.5
14
1 0.1
16
11.9
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
GWA-06S
Saprolite
08/13/2018
0.54 B,S1
283
0.16 B
0.62
0.619
10
<0.2
0.15 j
3.7
0.1
<5
<0.5
5.74
<0.1
0.29 j,S1
4.5 j,B
<100
<0.5
0.06 j
53.4
0.084 j
<50
<0.08
2
0.13
1.5 B
35.1 j
GWA-06S
Saprolite
11/08/2018
0.64 Sl
279
0.22
0.64 j
0.607
8.3
<0.2
<0.5
<0.5
0.12
<5
<0.5
5.78
<0.1
0.66 B,S1
5.7 j,B
<100
<0.5
<0.1
51.7
0.08 j
<50
<0.08
0.22 j,S1
0.026 j
1.8 Sl
<50
GWA-07D
Transition Zone
02/12/2018
<0.5 B
83.8 SI
<0.1
8.1
13.2
<5
<0.2
0.62
5.4 SI
0.34
7.16
<0.5
6.14
<0.1
4.6
<10
<100
<0.5
0.19
354
<0.1
<50
<0.08
7.7 SI
<0.1
0.51 S1
<50
GWA-07D
Transition Zone
05/14/2018
0.51 Sl
452
0.11 B,51
7.7 Sl
12.7
12.3
<0.2
0.64
4.9
0.34
6.84
0.26 j
6.42
<0.1
4.5
<10
<100
<0.5
0.15
338
<0.1
<50
<0.08
6.2
0.043 j
0.26 j,S1
<50
GWA-07D
Transition Zone
08/10/2018
0.3 j,S1
132
0.043 j
7.6
12.3
5.4
<0.2
0.58
4.2
0.34
6.76
0.28 j
6.35
<0.1
4.4
3.3 j,B,SI
<100
<0.5
0.15
18.2
<0.1
<50
<0.08
5.7
0.027 j
0.51 B,S1
<50
GWA-07D
Transition Zone
11/07/2018
0.33 j,S1
84.2
<0.1
6.5
12
3.5 j
<0.2
0.67 Sl
4.1
0.34
6.5
<0.5
5.94
<0.1
4.5
3.5 j
<100
<0.5
0.13
304
<0.1
<50
<0.08
5.2
0.057 j
1.4 BC,S1
<50
GWA-07S
Saprolite
02/12/2018
0.78 B,S1
1000
<0.1
3.6
11.1
78
<0.2
1
11.3
0.062
<5
<0.5
6.39
<0.1
<0.3
<10
<100
<0.5
<0.1
147
<0.1
<50
<0.08
2.8 SI
3.3
0.54 S1
<50
GWA-07S
Saprolite
05/14/2018
0.51 Sl
1370
<0.1
5.3 Sl
13.6
264
<0.2
0.74
6
0.098 Sl
3.98 j
<0.5
7.11
<0.1
0.44 Si
<10
<100
<0.5
0.079 j
221
<0.1
119
<0.08
3.5
4.6
0.66 S1
<50
GWA-07S
Saprolite
08/10/2018
0.35 j,S1
1150
<0.1
6.4
13.9
326
<0.2
0.98
4.4
0.07
3.69 j
<0.5
6.98
<0.1
0.38S1
11.3 B,S1
3890
<0.5
0.05 j
68.1
<0.1
38 j
<0.08
3.4
5
0.29 j,B,SI
<50
GWA-07S
Saprolite
11/07/2018
0.3 j,S1
1660
<0.1
5.2
13.6
551
<0.2
1.3
4.3
<0.02
3.42 j
<0.5
6.69
<0.1
0.61
11.6
<100
<0.5
0.089 j
200
<0.1
<50
<0.08
2.5
16.4
0.62 BC,S1
411
GWA-08D
Bedrock
02/08/2018
<0.5
280
<0.1
6.5
1.66
10.2
<0.2
<0.5
0.52 SI
0.29
<5
<0.5
8.46
<0.1
3.2
<10
<100
<0.5
0.31
29.6
<0.1
<50
<0.08
0.59
<0.1
0.61 SI
<50
GWA-08D
Bedrock
05/14/2018
0.51 Sl
291
0.09 j,S1
5.8 Sl
1.62
13
<0.2
0.28 j
0.58 Sl
0.27
<5
<0.5
7.85
0.045 j
3.3
2.7 j,S1
551
<0.5
0.17
29.3
<0.1
81
<0.08
0.63 Sl
0.022 j
0.35 j,S1
<50
GWA-08D
Bedrock
08/07/2018
1.6
229
0.052 j
5.6
1.67
19.2
<0.2
0.33 j
0.63
0.24
<5
<0.5
8.21
<0.1
3.6
3.9 j,S1
<100
<0.5
0.13
26.8
<0.1
<50
<0.08
0.57
0.02 j
1.5 S1
<50
GWA-08D
Bedrock
11/09/2018
0.86
99.6
<0.1
5
1.6
9.3
<0.2
0.25 j
0.53
0.25
<5
<0.5
7.93
<0.1
3.3
<10
<100
<0.5
0.12
30.5
<0.1
<50
<0.08
0.46 j,S1
0.012 j
0.52 S1
<50
GWA-08S
Saprolite
02/08/2018
<0.5
799
0.14 SI
3.1
1.47
12.3
<0.2
<0.5
<0.5
<0.02
<5
<0.5
7.61
<0.1
4.1
<10
<100
<0.5
<0.1
20.5
<0.1
<50
<0.08
0.93
<0.1
1.3 S1
<50
GWA-08S
Saprolite
05/14/2018
0.59 Sl
183
0.034 j,S1
3.1S1
1.61
5.2
<0.2
0.38 j
6.6
<0.02
<5
0.63
7.99
<0.1
3.3
<10
142
<0.5
<0.1
24
<0.1
29.7 j
<0.08
2.1
0.062 j
0.21 j,S1
31.1 j
GWA-08S
Saprolite
08/07/2018
0.68 B
45.7 j
<0.1
3.1
1.56
<5
<0.2
0.18 j
2.6
<0.02
<5
0.67
8.33
<0.1
2.9
2.9 j,S1
<100
<0.5
0.067 j
21
<0.1
<50
<0.08
2.6
0.033 j
1.3 S1
<50
GWA-08S
Saprolite
11/09/2018
2.4
510
0.16
3
1.56
8.7
<0.2
0.2 j
0.89
<0.02
<5
<0.5
7.54
<0.1
4
<10
<100
<0.5
0.059 j
23.4
0.014 j
<50
<0.08
2
0.034 j
0.83 S1
<50
GWA-09BR
Bedrock
02/12/2018
0.52 Sl
<50
<0.1
3.9
2.85
<5
<0.2
<0.5
0.72 SI
1.9
<5
<0.5
7.41
<0.1
3.2
<10
<100
<0.5
<0.1
16.4
<0.1
<50
<0.08
1 S1
<0.1
<0.5 B
<50
GWA-09BR
Bedrock
05/14/2018
0.4 j,S1
<50
<0.1
3.8 Sl
2.84
3.1 j
<0.2
0.39 j
<0.5
1.8
<5
<0.5
7.52
<0.1
3.3
<10
<100
<0.5
0.068 j
13.9
<0.1
<50
<0.08
0.7 Sl
<0.1
0.32 j,S1
<50
GWA-09BR
Bedrock
08/09/2018
0.29 j
27.7 j
0.042 j
4.1
2.81
<5
<0.2
0.41 j
0.53
1.9
<5
<0.5
7.14
<0.1
3.1
2.9 j,S1
<100
<0.5
0.071 j,S1
15.6
<0.1
<50
<0.08
0.73 SI
<0.1
0.55 S1
<50
GWA-09BR
Bedrock
11/08/2018
0.17 j,S1
<50
<0.1
3.3
2.86
<5
<0.2
0.42 j
<0.5
1.9
<5
<0.5
7.53
<0.1
3.1
4.8 j,B
<100
<0.5
0.04 j
15.1
<0.1
<50
<0.08
0.73 Sl
<0.1
0.22 j,S1
<50
GWA-10D
Transition Zone
02/12/2018
1.7 B,S1
652
<0.1
8.7
30
16.4
<0.2
<0.5
3 SI
0.035
6.58
<0.5
15.1
<0.1
0.87
<10
<100
<0.5
<0.1
65.4
<0.1
<50
<0.08
0.51 SI
0.24
<0.5
615
GWA-10D
Transition Zone
05/14/2018
0.2 j,S1
848
0.035 j,B,SI
9.3
30.7
18.1
<0.2
0.52
0.82
<0.02
6.59
<0.5
15.5
<0.1
0.99 Sl
<10
<100
<0.5
0.075 j
61.8
<0.1
<50
<0.08
0.14 j,S1
0.26
0.26 j,51
439
GWA-10D
Transition Zone
08/13/2018
<0.5
829
<0.1
8.3
31.3
14.5
<0.2
0.54
0.42 j,S1
<0.02
6.82
<0.5
15.5
<0.1
0.73 S3
2.6 j,B
<100
<0.5
0.076 j
56
<0.1
<50
<0.08
0.21 j
0.23
<0.5
431
GWA-SOD
Transition Zone
11/08/2018
0.34 j,S1
836
0.24
10
30.2
12.3
<0.2
2.3
0.7
<0.02
6.52
<0.5
14.8
0.086 j
1 B
3.1 j,B
<100
<0.5
0.056 j
56.1
<0.1
<50
<0.08
0.27 j,S1
0.2
<0.5
345
GWA-10S
Saprolite
02/12/2018
0.72 B,S1
789
0.19
0.88
6.24
61.3
<0.2
<0.5
14
0.021
<5
2.2
14.3
<0.1
2.4
<10
<100
<0.5
0.2
56.4
0.11
69.7
<0.08
3.3 S1
0.15
0.79 SI
<50
GWA-SOS
Saprolite
05/14/2018
0.52 SI
548
0.11 B,51
0.72 SI
6.07
28.6
<0.2
0.11 j
3.3
<0.02
<5
2.2
14.3
<0.1
2.3
5 j,S1
<100
<0.5
0.2
51.2
0.12
83.5
<0.08
1.4 S1
0.066 j
0.95 SI
<50
GWA-10S
Saprolite
08/13/2018
0.36 j,B,SI
386
0.11 B
0.8
5.77
34.6
<0.2
0.12 j
1.8 SI
<0.02
<5
2.3
13.5
<0.1
2.7
5.3 j,B
<100
<0.5
0.22
45.4
0.11
77.4
<0.08
1.8
0.096 j
0.3 j,B
<50
GWA-SOS
Saprolite
11/08/2018
0.65 Sl
408
0.24
0.74 j
6.27
58.4
<0.2
0.14 j
2.3
<0.02
<5
2
14.4
<0.1
3.5
8.3 j,B
<100
<0.5
0.17
49.2
0.11
104
<0.08
1.4
0.21
0.4 j,S1
65.3
GWA-11BR
Bedrock
02/07/2018
<0.5
273
0.11
5.3
11.7
18.1
<0.2
0.82
1 sl
<0.02
<5
<0.5
11.5
<0.1
1.7
<10
<100
1.1
<0.1
45.5
<0.1
<50
<0.08
<0.5
<0.1
<0.5
55.9
GWA-11BR
Bedrock
05/11/2018
0.32 j
228
0.13 51
5.8
10.3
6.6
<0.2
0.98
1.1
<0.02
5.28
<0.5
11
<0.1
2.7
<10
<100
2.2
0.12
45.2
<0.1
<50
<0.08
0.13 j,S1
0.024 j
<0.5
<50
GWA-11BR
Bedrock
08/08/2018
0.52 Sl
345
0.16
5.7
12.8
8.5
<0.2
1.6
5.3
<0.02
4.56 j
0.15 j
10.3
<0.1
2.4
5.4 j,B
<100
0.12 j
0.12 S1
48.2
<0.1
31.9 j
<0.08
0.2 j,S1
0.067 j
0.3 j,B,SI
28.8 j
GWA-11BR
Bedrock
11/07/2018
1.6 S1
141
0.25
4.9
11.8
4.1 j
<0.2
1.3
2.2
<0.02
4.62 j
<0.5
10.2
<0.1
2.4
4 j,B
<100
0.13 j
0.12
46.1
<0.1
32.8 j
<0.08
0.4 j,B,SI
0.036 j
0.55 SI
27.2 j
GWA-11D
Transition Zone
02/07/2018
<0.5
103
0.11
7.8
11.4
117
<0.2
<0.5
0.84 SI
0.17
<5
11.1
16.2
<0.1
1.8
<10
<100
<0.5
<0.1
105
<0.1
991
<0.08
2.4
0.16
1.6 S1
<50
GWA-SSD
Transition Zone
05/11/2018
0.66
268
0.46 SI
8.5
10.4
108
<0.2
0.4 j,S1
1.2
0.19
4.76 j
10.6
15.2
<0.1
2.3
4.9 j
<100
<0.5
0.066 j
97.8
0.042 j
1010
<0.08
2.1
0.13
0.89 Sl
<50
GWA-11D
Transition Zone
08/08/2018
1.3
585
0.62
8.7
11.3
79.6
<0.2
0.47 j
0.85
0.2
4.74 j
10.7
16.2
<0.1
2.4
8.3 j,B
<100
<0.5
0.1 SS
85.4
<0.1
964
<0.08
2.2 S1
0.093 j
0.56 B,S1
<50
GWA-SSD
Transition Zone
11/07/2018
0.77 SI
45.6 j
<0.1
7.5
11
59.2
<0.2
0.42 j,S1
0.83
0.21
4.38 j
8.7
15.8
<0.1
2
4.4 j,B
<100
<0.5
0.1
77.3
0.032 j
968
<0.08
2.2
0.078 j
0.44 j,S1
<50
GWA-11S
Saprolite
02/07/2018
1.3 S1
854
0.28
2
24.1
21.8
<0.2
<0.5
1.5 sl
0.31
7.82
23.8
28.4
<0.1
0.59
25.1
<100
<0.5
0.15
50.5
0.16
2620
0.25
<0.5
0.25
1.2 S1
60.2
GWA-11S
Saprolite
05/11/2018
0.64
98.8
0.096 j,S1
2.2
22.2
16
<0.2
<0.5
1.8
0.33
7.96
23.3
26.7
<0.1
0.23 j,B,SI
20.4
<100
<0.5
0.087 j
49.8
0.14
2630
0.23
0.62 S1
0.24
1 S1
<50
GWA-11S
Saprolite
08/08/2018
4.8
296
0.23
2.3 Sl
23.5
21
<0.2
2.4
1.7
0.37
7.94
22.1
27.7
<0.1
0.19 j
28.4 B
<100
<0.5
0.14 Sl
45.4
0.17
2460
0.23
0.52 sl
0.22
2 Sl
<50
GWA-11S
Saprolite
11/07/2018
1.5 S3
157
0.17
2 j
23.8
15.8
<0.2
<0.5
1.4
0.42
7.91
18.2
26.7
<0.1
0.42
23.6 B
<100
<0.5
0.17
43
0.15
2460
0.24
0.48 j,B,SI
0.21
IA Sl
<50
GWA-12BR
Bedrock
02/08/2018
<0.5
593
0.15 sl
11
1.75
279
0.22
2.8
2.3
0.29
7.45
<0.5
11.7
<0.1
<0.3
<10
<100
<0.5
0.38
28.9
<0.1
<50
<0.08
<0.5
1.3
0.7 Sl
307
GWA-12BR
Bedrock
05/10/2018
0.4 j,S1
898
0.25
9.3
1.76
275
<0.2
2.1
1.9
0.22
6.37
0.18 j
10.4
<0.1
0.16 j,S1
5.6 j
<100
<0.5
0.44
23.9
<0.1
<50
<0.08
0.3 j
0.95
0.13 j,S1
246
GWA-12BR
Bedrock
08/09/2018
0.27 j
262
0.058 j
8.2
1.86
198
<0.2
1.9
1.7
0.32
6.2
0.21 j
10.7
<0.1
0.11 j
6.3 j,B,SI
<100
<0.5
0.16 S1
24.6
<0.1
<50
<0.08
<0.5
0.98
0.15 j,S1
98.6
GWA-12BR
Bedrock
11/08/2018
0.44 j,S1
505
0.16
7.7
1.87
385
<0.2
2.4
2.5
0.28
6.59
<0.5
11.6
<0.1
0.12 j,B,SI
6.7 j,B
<100
<0.5
0.12
24.6
<0.1
<50
<0.08
<0.5
0.84
0.75 SI
113
GWA-12D
Bedrock
02/08/2018
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-12D
Bedrock
05/10/2018
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-12D
Bedrock
08/09/2018
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-12D
Bedrock
11/08/2018
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
T NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-12S
Saprolite
02/08/2018
0.5 sl
131 SI
<0.1
0.56
0.403
26.2
<0.2
<0.5
IA SI
0.85
<5
<0.5
6.05
<0.1
<0.3
<10
<100
<0.5
<0.1
49.3
<0.1
<50
<0.08
1.2
0.94
<0.5
<50
GWA-12S
Saprolite
05/10/2018
0.42 j,S1
80.8 Sl
0.038 j
0.79 Sl
0.382
16.4
<0.2
<0.5
2.1
0.94
<5
0.24 j
3.76 j
0.04 j
<0.3
6.4 j
<100
<0.5
0.063 i
45.8
0.063 j
<50
<0.08
0.76
0.4
0.74 S1
<50
Page 23 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
RADIONUCLIDES
OTHER PARAMETERS
Lead
(0.45u)
Manganese
(0.45u)
Mercury
(0.45u)
Molybdenum
(0.45u)
Nickel
(0.45u)
Phosphorus
(0.45u)
Selenium
(0.45u)
Silver
(0.45u)
Strontium
(0.45u)
Thallium
(0.45u)
Vanadium
(0.45u)
Zinc
(0.45u)
Radium-226
Radium-228
Total
Radium
Uranium-238
Total
Uranium
Uranium-238
DIS
Carbonate
Alkalinity
Fluoride
Phosphorus
Reporting Units
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pCi/L
pCi/L
pCi/L
ug/mL
ug/mL
ug/mL
mg/L
mg/L
mg/L
15A NCAC 02L Standard
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5A
NE
0.03A
NE
NE
2
NE
Background Threshold Values (Shallow Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
3
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Deep Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
2.8
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Bedrock Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5.7
NE
0.0005
NE
5
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
GWA-06S
Saprolite
08/13/2018
<0.1
6.2
<0.2
0.11 j,B
4.9
0.03 j
<0.5
NA
49.4
<0.1
0.24 j
2.8 j
0.662 U
0.248 U
0.91 U
<0.0005
<0.0005
<0.0005
<5
<0.1
0.034 j
GWA-06S
Saprolite
11/08/2018
<0.1
4.7 j
<0.2
<0.5
<0.5
0.03 j
<0.5
NA
49.6
<0.1
0.31
7.1 j
0.654 S1
0.27 U
0.924 U
NA
0.00012 j
NA
<5
<0.1
0.031 j
GWA-07D
Transition Zone
02/12/2018
<0.1
<5
<0.2
0.85
7.1
0.21
<0.5
NA
188
<0.1
5.8
<10
NA
NA
NA
NA
NA
NA
<5
0.33
0.21
GWA-07D
Transition Zone
05/14/2018
0.06 j,S1
<5
<0.2
0.65
4.9
0.2
0.32 j
NA
185
<0.1
4.7
<10
NA
NA
NA
NA
NA
NA
<5
0.34 Sl
0.2
GWA-07D
Transition Zone
08/10/2018
<0.1
<5
<0.2
0.66
4.3
0.21
0.33 j
NA
186
<0.1
4.1
<10
NA
NA
NA
NA
NA
NA
<5
0.37
0.21
GWA-07D
Transition Zone
11/07/2018
<0.1
<5
<0.2
0.62
4.6
0.2
<0.5
NA
173
<0.1
4.3
3.3 j,S1
NA
NA
NA
NA
NA
NA
<5
0.36
0.2
GWA-07S
Saprolite
02/12/2018
<0.1
33
<0.2
1
12.5
<0.05
<0.5
NA
148
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
0.19
<0.05
GWA-07S
Saprolite
05/14/2018
<0.1
160
<0.2
0.81
6.1
<0.05
<0.5
NA
201
<0.1
0.077j
<10
NA
NA
NA
NA
NA
NA
<5
0.22 Sl
0.043j
GWA-07S
Saprolite
08/10/2018
<0.1
<5
<0.2
0.79
4.3
0.046 j
<0.5
NA
800
<0.1
<0.3
6.1 j,B
NA
NA
NA
NA
NA
NA
<5
0.25
0.061
GWA-07S
Saprolite
11/07/2018
<0.1
268
<0.2
0.79
4.5
0.031 j
<0.5
NA
168
<0.1
0.35 B,S1
12.6 Sl
NA
NA
NA
NA
NA
NA
<5
0.22
0.08
GWA-08D
Bedrock
02/08/2018
0.13
<5
<0.2
<0.5
0.56
0.15
<0.5
NA
166
<0.1
3.1
<10
NA
NA
NA
NA
NA
NA
<5
0.11
0.056
GWA-08D
Bedrock
05/14/2018
<0.1
3.8 j
<0.2
0.2 j
0.63
0.055
<0.5
NA
174
<0.1
3.2
13.2
NA
NA
NA
NA
NA
NA
<5
0.1 Sl
0.055
GWA-08D
Bedrock
08/07/2018
0.057 j
5
<0.2
0.24 j
0.69
0.082
<0.5
NA
155
<0.1
3.4
2.6 j
NA
NA
NA
NA
NA
NA
<5
0.12
0.081
GWA-08D
Bedrock
11/09/2018
<0.1
<5
<0.2
0.18 j
<0.5
0.064
<0.5
NA
158
<0.1
3
<10
NA
NA
NA
NA
NA
NA
<5
0.11
0.067
GWA-08S
Saprolite
02/08/2018
<0.1
<5
<0.2
<0.5
<0.5
0.11
<0.5
NA
154
<0.1
3.5
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.11
GWA-08S
Saprolite
05/14/2018
<0.1
<5
<0.2
0.24 j
3
0.095
0.61
NA
200
<0.1
2.8
3.4 j
NA
NA
NA
NA
NA
NA
<5
0.069 j,S1
0.11
GWA-08S
Saprolite
08/07/2018
<0.1
<5
<0.2
0.15 j
1.5
0.096
0.54
NA
179
<0.1
3
<10
NA
NA
NA
NA
NA
NA
<5
0.087 j
0.11
GWA-08S
Saprolite
11/09/2018
<0.1
<5
<0.2
0.17 j
0.68
0.099
<0.5
NA
171
<0.1
2.7
5.7 j,S1
NA
NA
NA
NA
NA
NA
<5
0.085 j
0.12
GWA-09BR
Bedrock
02/12/2018
<0.1
<5
<0.2
<0.5
<0.5
0.057
<0.5
NA
53.1
<0.1
3.1
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.061
GWA-09BR
Bedrock
05/14/2018
<0.1
<5
<0.2
0.41 j
<0.5
<0.05
<0.5
NA
48.5
<0.1
3.1
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.049 j
GWA-09BR
Bedrock
08/09/2018
<0.1
<5
<0.2
0.37 j
0.38 j,S1
0.077
<0.5
NA
49.9
<0.1
2.9
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.078
GWA-09BR
Bedrock
11/08/2018
<0.1
<5
<0.2
0.43 j
<0.5
0.06
<0.5
NA
49.7
<0.1
3.3
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.06
GWA-10D
Transition Zone
02/12/2018
<0.1
17.3
<0.2
<0.5
2.6 S1
<0.05
<0.5
NA
1680
<0.1
0.76
<10
NA
NA
NA
NA
NA
NA
<5
0.12
<0.05
GWA-10D
Transition Zone
05/14/2018
<0.1
13.7
<0.2
0.5 j
0.91
<0.05
<0.5
NA
1670
<0.1
0.86
<10
NA
NA
NA
NA
NA
NA
<5
0.15 S1
<0.05 M1
GWA-10D
Transition Zone
08/13/2018
<0.1
11.6
<0.2
0.53 B
0.56
0.028 j
<0.5
NA
1550
<0.1
0.76
<10
NA
NA
NA
NA
NA
NA
<5
0.16
<0.05
GWA-SOD
Transition Zone
11/08/2018
<0.1
9.3
<0.2
0.46 j
0.51
<0.05
<0.5
NA
1600
<0.1
0.84
<10
NA
NA
NA
NA
NA
NA
<5
0.16
<0.05
GWA-10S
Saprolite
02/12/2018
<0.1
52.1
<0.2
<0.5
15.4
0.094
2.2
NA
786
<0.1
2
<10
NA
NA
NA
NA
NA
NA
<5
0.14
0.11
GWA-10S
Saprolite
05/14/2018
<0.1
22
<0.2
0.1 j
3.2
0.09
2.2
NA
754
<0.1
1.8
3.7 j
NA
NA
NA
NA
NA
NA
<5
0.17 Sl
0.1
GWA-10S
Saprolite
08/13/2018
<0.1
38
<0.2
0.16 j,B
1.7
0.15
2.1
NA
663
<0.1
2.1
2.5 j
NA
NA
NA
NA
NA
NA
<5
0.19
0.12
GWA-10S
Saprolite
11/08/2018
<0.1
67.4
<0.2
0.13 j
2
0.099
1.9
NA
703
<0.1
2.3
4.2 j
NA
NA
NA
NA
NA
NA
<5
0.2
1 0.12
GWA-11BR
Bedrock
02/07/2018
<0.1
16.8
<0.2
0.82
<0.5
<0.05
<0.5
NA
552
<0.1
1.2
<10
0.642
1.42 B,S1
0.918
2.062
0.0033
0.0033
NA
<5
0.29
<0.05
GWA-11BR
Bedrock
05/11/2018
<0.1
7.7
<0.2
0.95
0.37 j,S1
<0.05
<0.5
NA
531
<0.1
1.6
<10
0.125 U
1.04 U
0.0035
0.0035
0.003
<5
0.34
<0.05
GWA-11BR
Bedrock
08/08/2018
<0.1
6.6
<0.2
0.96 SI
3.3
<0.05
0.21 j,S1
NA
530
<0.1
1.7
<10
0.237 U
1.62
1.86
0.004
0.004
0.0036
<5
0.34
<0.05
GWA-11BR
Bedrock
11/07/2018
<0.1
6.9
<0.2
0.64
1.8
<0.05
<0.5
NA
543
<0.1
1.9
4.3 S1
0 U
0.357 U
0.357 U
NA
0.0039
NA
<5
0.31
<0.05
GWA-11D
Transition Zone
02/07/2018
<0.1
84.6
<0.2
<0.5
1.2
0.079
10.8
NA
1610
<0.1
1.7
<10
0.609
1 B,S1
1.609
<0.0005
<0.0005
NA
<5
<0.1
0.066
GWA-SSD
Transition Zone
05/11/2018
0.043 j
79.2
<0.2
0.32 j
IA S3
0.055
10.2
NA
1580
<0.1
1.8
5.5 j
0.327 U
0.951
1.28 U
0.000092 j
0.000092 j
<0.0005
<5
0.08 j
0.073
GWA-11D
Transition Zone
08/08/2018
0.11
64.6
<0.2
0.33 j,S1
0.76 Sl
0.091
10.5
NA
1500
<0.1
1.8
3.8 j,B
0.682
1.31
1.99
<0.0005
<0.0005
<0.0005
<5
0.085 j
0.078
GWA-SSD
Transition Zone
11/07/2018
<0.1
59.5
<0.2
0.19 j
0.57
0.067
9.2
NA
1520
<0.1
1.8
<10
0 U
1.05
1.05 U
NA
<0.0005
NA
<5
0.073 j
0.076
GWA-11S
Saprolite
02/07/2018
0.1
15.6
<0.2
<0.5
1.8
<0.05
23.9
NA
1050
<0.1
<0.3
21.2
0.0553
0.833 B,S1
0.8883
<0.0005
<0.0005
NA
<5
<0.1
<0.05
GWA-11S
Saprolite
05/11/2018
0.076 j
15.9
<0.2
<0.5
2 S3
<0.05
22.4
NA
1030
<0.1
0.2 j,S1
22.8
0.261 U
-0.706 U
0.261 U
0.00022 j
0.00022 j
0.00019 j
<5
<0.1
<0.05
GWA-11S
Saprolite
08/08/2018
0.059 j
13.6
<0.2
0.98 Sl
1.5 sl
<0.05
22.3
NA
961
<0.1
<0.3
20.9 B
0.467
0.0181 U
0.485 U
0.00021 j
0.00021 j
0.0002 j
<5
<0.1
<0.05
GWA-11S
Saprolite
11/07/2018
<0.1
13
<0.2
<0.5
1.5
<0.05
19.9
NA
990
<0.1
0.2 j,B,S1
20.6 j,S1
0.649
0.767
1.42
NA
0.00022 j
NA
<5
<0.1
<0.05
GWA-12BR
Bedrock
02/08/2018
<0.1
254
<0.2
2.4
2.3
<0.05
<0.5
NA
173
<0.1
<0.3
<10
0.498
0.789
1.287
<0.0005
<0.0005
NA
<5
0.12
<0.05
GWA-12BR
Bedrock
05/10/2018
<0.1
153
<0.2
2.2
1.8 s1
<0.05
0.17 j
NA
161
<0.1
0.11 j
3.2 j
0.512 U
1.09
1.6
0.000045 j
0.000045 j
<0.0005
<5
0.13
<0.05
GWA-12BR
Bedrock
08/09/2018
<0.1
123
<0.2
2.2
1.7 S1
<0.05
0.16 j
NA
j 163
<0.1
0.14 j,S1
3.3 j
1
0.192 U
1.19
<0.0005
<0.0005
<0.0005
<5
0.11
0.029 j
GWA-12BR
Bedrock
11/08/2018
<0.1
244
<0.2
2.1
2.5
<0.05
<0.5
NA
161
<0.1
0.072 j
4.5 j
0.661 S1
0.405 U
1.07 U
NA
0.00014 j
NA
<5
0.11
<0.05
GWA-12D
Bedrock
02/08/2018
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-12D
Bedrock
05/10/2018
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-12D
Bedrock
08/09/2018
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-12D
Bedrock
11/08/2018
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-12S
Saprolite
02/08/2018
<0.1
25
0.36
<0.5
0.98
<0.05
<0.5
NA
9.8
<0.1
<0.3
<10
0.188
0.531
0.719
<0.0005
<0.0005
NA
<5
<0.1
<0.05
GWA-12S
Saprolite
05/10/2018
<0.1
14.9
0.2
<0.5
2 S3
<0.05
0.26 j
NA
9.6
0.04 j
0.079 j
5.1 j
0.379 U
0.265 U
0.644 U
<0.0005
<0.0005
<0.0005
<5
<0.1
<0.05
Page 24 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
FIELD PARAMETERS
WATER QUALITY PARAMETERS
SELECTED 40CFR257 APPENDIX III CONSTITUENTS plus Sr
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
PH
Water
Level
Temp
Spec
Cond
DO
ORP
Eh
Turbidity
Alkalinity
Bi-
carbonate
Alkalinity
Sulfide
Total
Organic
Carbon
Total
Suspended
Solids
Boron
Calcium
Chloride
Strontium
Sulfate
Total
Dissolved
Solids
Aluminum
Antimony
Arsenic
Barium
Beryllium
Cadmium
Chromium
(VI)
Chromium
Cobalt
Reporting Units
S.U.
ft
Deg C
Nmhos/cm
mg/L
mV
mV
NTUs
mg/L
mg/L
mg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
pg/L
pg/L
Ng/L
pg/L
Ng/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
6.5-8.5
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
700
NE
250
NE
250
Soo
NE
1*
10
700
4*
2
10
10
1*
Background Threshold Values (Shallow Unit)
4.6-6.4
NE
NE
NE
NE
NE
NE
NE
63
63
0.1
1
NE
50
10.7
5.5
303
4.2
140
757
0.5
0.4
310
0.2
0.08
5.7
16.5
1.2
Background Threshold Values (Deep Unit)
5.7-6.9
NE
NE
NE
NE
NE
NE
NE
204
204
0.1
1
NE
50
13.1
4.7
665
17.7
183
128
0.5
0.6
127
0.1
0.08
3
7.6
1.9
Background Threshold Values (Bedrock Unit)
5.6-7.6
NE
NE
I NE
I NE
NE
NE
NE
108
108
0.1
1
NE
50
15
1 4.5
253
18.4
216
300
0.5
0.6
435
1 0.2
0.08
3.9
1 8.3
2.8
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
GWA-12S
Saprolite
08/09/2018
5.3
17.43
27
34
5.30
176
381
0.1
2 j
2 j
<0.1 MI,R1
<1
<5
<50
0.247
2.3
9
3.2
33 D6
55.7 j
<0.5
0.12 B,S1
44.2
0.059 j
<0.08
0.58 M1,RI
0.74 S1
0.18
GWA-12S
Saprolite
11/08/2018
5.3
16.98
18
34
3.40
-17
188
2.8
1.9 j
1.9 j
<0.1
<1
<2.5
<50
0.262
2.1
10.6
2.6
29
<100
<0.5
<0.1
51.4
0.062 j
<0.08
0.66
0.82 B,SI
0.47
GWA-13DA
Transition Zone
02/08/2018
9.0
30.40
13
183
1.50
41
246
5.1
NA
NA
NA
NA
NA
<50
NA
NA
NA
2.9
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-13DA
Transition Zone
05/10/2018
8.3
27.50
26
192
1.60
157
362
6.6
NA
NA
NA
NA
NA
<50
NA
NA
NA
2.9
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-13DA
Transition Zone
08/09/2018
8.0
27.13
28
204
1.70
63
268
4.9
NA
NA
NA
NA
NA
<50
NA
NA
NA
2.9
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-13DA
Transition Zone
11/09/2018
7.7
26.05
14
202
1.10
-20
185
1.0
106
106
<0.1
<1
<2.5
<50
19.1
2.2
107
2.8
136
<100
1.7
1.1
13.8
0.032j
<0.08
0.53 M1,S1
1.4
0.037j
GWA-13S
Saprolite
02/08/2018
5.3
24.38
15
22
4.40
195
400
0.0
<5
<5
<0.1
<1
<5
<50
0.34
1.3
5.1
<1
<25
<100
<0.5
<0.1
97.4
<0.1
<0.08
0.73
2.8 SI
0.43
GWA-13S
Saprolite
05/14/2018
4.7
20.02
25
35
4.50
161
366
0.0
2.7 j
2.7 j
<0.1
<1
<2.5
<50
1.17
2.1
12.3 SI
1.1
<25
73.3 j,S1
<0.5
<0.1
97.9
0.051 j
0.039 j
0.69 Ml
0.86 Sl
0.071 j
GWA-13S
Saprolite
08/09/2018
5.3
20.13
33
26
3.30
-7
199
1.6
3.5 j
3.5 j
<0.1
<1
<2.5
<50
0.56
2.2
6
0.77 j
<25
<100
<0.5
0.12 B,SI
74.4
<0.1
0.037 j
0.9
1 SS
0.1
GWA-13S
Saprolite
11/09/2018
5.4
18.88
13
28
4.10
70
275
2.6
4.4 j
4.4 j
<0.1
<1
<5
<50
1.01
2.4
8.6
0.81 j
30
104
<0.5
0.11
84.3
0.042 j
<0.08
0.67 Sl
1
0.13
GWA-14D
Transition Zone
02/08/2018
6.6
44.63
15
67
5.90
178
383
0.0
31.8
31.8
<0.1
<1
<2.5
<50
5
1.2
58.8
<1
59 SI
<100
<0.5
0.32 SI
21.6
<0.1
<0.08
0.71
2.1 SI
<0.1
GWA-14D
Transition Zone
05/14/2018
6.1
43.53
26
77
4.70
101
306
0.0
31
31
<0.1
<1
<2.5
<50
5.1
1.4
59.9 sl
1.1
188
105 Sl
0.26 j
0.44
20
<0.1
<0.08
0.84
1.2 B,SI
0.042 j
GWA-14D
Transition Zone
08/09/2018
6.6
43.18
35
101
2.60
-64
141
8.2
42.2
42.2
<0.1
0.7 j
8.3
<50
7.23
2.1
78.6
2.3
88
579
1.3
0.83
27.2
<0.1
0.081
0.073
1.3 Sl
0.28
GWA-14D
Transition Zone
11/08/2018
6.1
42.35
17
84
2.00
33
238
8.5
41.1
41.1
<0.1
<1
7.7
<50
6.49
1.6
72.2
1.6
89
314
0.73
0.63
26.8
0.022j
0.097
0.29
2 Sl
0.25
GWA-14S
Saprolite
02/08/2018
5.5
43.84
10
27
6.80
56
261
5.1
<5
<5
<0.1
<1
2.8
<50
0.916
1
13.1
<1
<25
208
<0.5
0.56
36.2
<0.1
<0.08
0.47
1.2 SI
0.25
GWA-14S
Saprolite
05/14/2018
5.3
42.94
27
28
4.30
141
346
2.0
5.8
5.8
<0.1
<1
<2.5
<50
0.969
1.1
12.5 SI
<1
<25
<100
<0.5
<0.1
33.2
0.069 j
<0.08
0.23 Sl
0.42 j,B,Sl
0.1
GWA-14S
Saprolite
08/09/2018
5.1
42.56
24
29
5.50
186
391
2.5
5.9
5.9
<0.1
<1
12.3
<50
0.873
1.2
12.9
<1
27
385
<0.5
0.078 j,B,SI
34.8
0.069 j
<0.08
0.28
0.46 j,SI
0.17
GWA-14S
Saprolite
11/08/2018
5.5
41.78
17
29
5.40
182
387
0.5
6.7
6.7
<0.1
<1
<2.5
<50
1.12
1.3
13.8
<1
28
<100
<0.5
<0.1
38.2
0.054 j
<0.08
0.36
0.59 B,SI
0.12
GWA-15D
Transition Zone
08/09/2018
6.5
23.04
21
430
0.20
-103
102
0.6
67.6
67.6
<0.1
<1
<2.5
118 B
35.6
43.2
898
80.5
294
<100
0.095j
0.18 B,SI
136
<0.1
<0.08
<0.025
0.22 j,S1
3.6
GWA-15D
Transition Zone
11/07/2018
6.7
24.44
16
486
0.50
-90
115
0.6
77.5
77.5
<0.1
<1
4.5
44.6j
46.8
32
1040
117
344
194
<0.5
0.17 S1
83.2
<0.1
<0.08
<0.025
1.5 S1
1.1
GWA-15S
Saprolite
02/12/2018
5.5
23.42
16
716
1.70
9
214
6.5
14.4
14.4
<0.1
<1
<2.5
1490
51.4
135
1540
75.9 M1
427
184
<0.5
0.13
144
0.17
0.31
0.19
1.2 S1
1.2
GWA-15S
Saprolite
05/11/2018
5.4
39.11
18
770
1.70
-81
124
6.4
14.7 M1
14.7
<0.1
<1
<2.6
1640
53.1
159
1630
93.7
483 S1
81.9 j,S1
<0.5
0.22 S1
144
0.18
0.32
0.13 M1,R1
0.5 j,S1
2.2
GWA-15S
Saprolite
08/08/2018
5.4
22.73
20
723
1.40
-203
2
4.5
15.4
15.4
<0.1
<1
<2.5
1490
53.6
152
1700
84.4
529
114
<0.5
0.14
146
0.13
0.22
0.16
0.86
1.2
GWA-15S
Saprolite
11/07/2018
5.5
24.12
16
751
1.30
171
376
7.0
14.2
14.2
<0.1
<1
4.3
1640
55.7
161
1750
86.7
452
55.9j
<0.5
0.076j,S1
163
0.13
0.29
0.17
0.63 S1
1.4
MS-08
Saprolite
02/12/2018
6.0
46.83
17
44
6.20
185
390
9.7
20.3
20.3
<0.1
<1
<5
<50
2.71
1
85.3
<1
53
187
<0.5
<0.1
31.3
<0.1
<0.08
3
4.1 S1
<0.1
MS-08
Saprolite
05/15/2018
6.2
46.12
22
47
4.90
221
426
1.7
20.6
20.6
<0.1
<1
5.1 SI
<50
2.83
1.1
94.8
<1
57
730 S1
<0.5
0.086 j
38.7
0.067 j
<0.08
3.3
5 Sl
0.14 SI
MS-08
Saprolite
08/13/2018
6.1
45.00
25
44
6.59
454
659
7.6
20.6
20.6
<0.1
<1
<2.7
<50
2.75
1.1
97
<1
55
1810
<0.5
0.17
57.3
0.051 j
<0.08
3.1
7.6
0.43
MS-08
Saprolite
11/09/2018
5.6
45.89
13
43
5.70
148
353
5.2
21.3
21.3
<0.1
<1
10.5
<50
2.97
1.1
100
<1
46
332
<0.5
0.1
33.4
0.062 j
<0.08
2.9
5
0.2
MS-10
Saprolite
02/12/2018
5.1
18.48
17
19
4.10
113
318
7.9
<5
<5
<0.1
<1
<2.5
<50
0.204
<1
15.9
<1
<25
155
<0.5
<0.1
113
0.12
<0.08
0.67
1.2 SI
0.53
MS-10
Saprolite
05/15/2018
5.0
17.61
17
19
4.40
295
500
6.2
<5
<5
<0.1
<1
3.4
<50
0.209
1.2
16.9
<1
27 D6
570
<0.5
<0.1
110
0.12
<0.08
0.67
1.3 Sl
0.53
MS-10
Saprolite
08/13/2018
5.0
18.44
20
18
4.87
395
600
3.2
3 j
3 j
<0.1
<1
<2.5
<50
0.209
0.97 j
17.2
<1
<25
54.6 j
<0.5
<0.1
111
0.084 j
<0.08
0.77
1 SS
0.46
MS-10
Saprolite
11/07/2018
4.4
17.78
17
18
4.90
168
373
7.3
3 j
3 j
<0.1
<1
5.4
<50
0.211
1.1
15.7
<1
35
201
<0.5
0.068 j,S1
105
0.12
<0.08
0.69
IA Sl
0.6
MS-11
Saprolite
02/12/2018
5.5
35.04
15
44
6.40
123
328
2.4
16.2
16.2
<0.1
<1
<2.5
<50
2.59
2.2
92.5
<1
36
<100
<0.5
0.12
75.6
<0.1
<0.08
2.3
3.2 S1
0.11
MS-11
Saprolite
05/15/2018
5.3
33.41
27
57
5.00
180
385
1.3
9.7
9.7
<0.1
0.52 j
<2.5
<50
1.74
6.9
69.4
2.1
48
84.5 j
<0.5
<0.1
87.6
0.096 j
<0.08
<0.025
3.4 Sl
0.44
MS-11
Saprolite
08/13/2018
5.3
34.36
23
42
8.12
374
579
2.2
10.6
10.6
<0.1
<1
<2.5
29.8 j
1.76
3.7
68.4
<1 M1
38
<100
<0.5
<0.1
71.9
<0.1
<0.08
2.2 M6,R1
2.6
0.14
MS-11
Saprolite
11/09/2018
4.9
33.73
9
52
4.70
119
324
2.5
15.9
15.9
<0.1
<1
<2.5
<50
2.34
3.6
90.9
0.56 j
47
<100
<0.5
0.095 j
87.1
0.055 j
<0.08
0.38 SI
1.9
0.32
MS-13
Saprolite
05/15/2018
5.4
30.13
22
63
2.20
206
411
1.3
15.8
15.8
<0.1
0.73 j
<2.5
<50
5.15
2.5
340
<1
55
<100
<0.5
0.071 j
85.8
0.23
<0.08
0.19
1.8 Sl
0.048 j
MS-13
Saprolite
08/13/2018
5.4
31.00
26
68
4.80
477
682
0.6
11.6
11.6
<0.1
<1
<2.6
<50
5.58
2.7
383
<1
54
<100
<0.5
0.1
96.5
0.17
<0.08
0.28
0.48 j,S1
0.054 j
MS-13
Saprolite
11/09/2018
5.0
30.42
10
66
3.40
169
374
0.1
22.5
22.5
<0.1
0.57 j
<5
<50
5.64
<1
404
<1
40
52.5 j
<0.5
0.074 j
99.5
0.21
<0.08
0.18 S1
0.38 j
0.049 j
MW-01
Saprolite
02/07/2018
5.7
51.32
12
569
1.10
99
304
1.3
8.7
8.7
<0.1
<1
<2.5
223
56.7
140
2430
13.1
346
<100
<0.5
0.11
370
0.17
0.16
3.2
3.4 Sl
<0.1
MW-01
Saprolite
05/09/2018
5.5
50.84
18
593
0.80
106
311
6.4
4.1j
4.1j
<0.1
<1
11.1
187
56.9
158
2310
14.8
317
566
<0.5
0.08j
355
0.18
0.14
4
4.7
0.11
MW-01
Saprolite
08/07/2018
5.6
50.88
22
608
1.90
184
389
9.4
8.2
8.2
<0.1
<1
19.8
192
58.2
154
2680
15.3
361
1280
<0.5
0.12
396
0.22
0.16
3.6
5.4
0.27
MW-01
Saprolite
11/08/2018
5.5
50.78
16
611
0.40
121
326
8.2
9.1
9.1
<0.1
<1
13.7
193
59.2
171
2610
14.4
346
479
<0.5
0.13
397
0.19
0.16
3.9
4.1 S1
0.28
MW-02
Saprolite
02/08/2018
5.6
5.95
15
408
0.80
114
319
4.5
26
26
<0.1
<1
<2.5
3290
30.2
4.6
1790
152
297
<100
<0.5
<0.1
57.1
0.14
0.084
0.12
<0.5
<0.1
MW-02
Saprolite
05/09/2018
5.4
6.38
19
412
0.60
26
231
0.6
26.4
26.4
<0.1
<1
<2.5
2900
29.8
4.9
1550
153
297
<100
<0.5
0.077j
45.7
0.18
0.084
0.097
0.24 j,S1
0.036j
MW-02
Saprolite
08/07/2018
5.5
6.21
20
410
0.52
382
587
0.7
25
25
<0.1
<1
<2.5
3030
30
4.8
1730
140
291
<100
<0.5
0.11
49.6
0.15
0.091
0.084 S1
0.3 j,S1
0.034j
MW-02
Saprolite
11/07/2018
5.4
5.64
17
410
0.60
204
409
1.0
28.2
28.2
<0.1
<1
<2.5
2930
28.2
4.7
1580
144
302
<100
<0.5
0.43 S1
42.5
0.14
0.11
0.086
0.28 j,B,SI
0.14 S1
MW-03 CAMA
Saprolite
02/12/2018
5.0
8.20
16
84
2.20
225
430
8.1
<5
<5
<0.1
<1
16.3
<50
1.01
9.2
56.1
<1
52
873
<0.5
<0.1
294
0.55
<0.08
1.2
2 SI
8.5
MW-03
Saprolite
05/14/2018
4.6
8.15
20
82
2.50
178
383
2.7
1 j
1 j
<0.1
<1
3.2
<50
0.874
9
46.2 SI
<1
41
183 SI
<0.5
<0.1
242
0.59
0.042 j
1.2
1.6 Sl
8.9
MW-03
Saprolite
08/13/2018
4.7
7.55
21
85
1.40
104
309
8.0
<5
<5
<0.1
<1
4.1
<50
1.21
9.5
63.2
<1
59
425
<0.5
<0.1
278
0.54
0.039 j
1.4
1.7 SI
8.5
MW-03
Saprolite
11/09/2018
4.9
6.45
16
85
2.00
160
1 3651
9.6
1 1.2 j
1.2 j
<0.1
<1
31.1
<50
1.22
9.7 MI
71.8
<1 MS
1 53
1010
<0.5
0.043 j
298
0.62
<0.08
0.24 SI
2.8
1 8.9
Page 25 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
Copper
Iron
Lead
Lithium
Magnesium
Manganese
Mercury
Molybdenum
Nickel
Nitrate
+ Nitrite
Potassium
Selenium
Sodium
Thallium
Vanadium
Zinc
Aluminum
(0.45u)
Antimony
(0.45u)
Arsenic
(0.45u)
Barium
(0.45u)
Beryllium
(0.45u)
Boron
(0.45u)
Cadmium
(0.45u)
Chromium
(0.45u)
Cobalt
(0.45u)
Copper
(0.45u)
Iron
(0.45u)
Reporting Units
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
mg-N/L
mg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
1000
300
15
NE
NE
50
1
NE
100
NE
NE
20
NE
0.2*
0.3*
1000
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Shallow Unit)
3.8
744
0.3
NE
1.8
75.3
0.2
0.5
9.9
2.7
5
0.5
9.1
0.1
5.6
19.2
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Deep Unit)
2.8
272
0.1
NE
14.4
141
0.2
3.2
7.5
1.4
7.8
0.5
29.2
0.1
3.8
17
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Bedrock Unit)
4.2
792
0.2
NE
13.2
26.6
0.2
3
7.2
0.4
9.8
0.5
14
1 0.1
16
11.9
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
GWA-12S
Saprolite
08/09/2018
0.44 j
42.7 j
<0.1
0.48 j
0.392
12.4
0.2
<0.5
1.1
0.94
<5
0.15 j
3.82 j
0.047 j
0.11 j
7.7 j,B,SI
<100
<0.5
<0.1
43.8
0.085 j,S1
<50
<0.08
0.84 SI
0.3 S1
0.92 S1
<50
GWA-12S
Saprolite
11/08/2018
0.47 j,51
<50
<0.1
0.52 j
0.425
17.1
0.51
<0.5
0.83
1.1
<5
<0.5
4.14 j
0.036 j
0.093 j,B,SI
6.4 j,B
<100
<0.5
<0.1
43.5
0.059 i
<50
<0.08
0.8 sl
0.49
0.96 Sl
<50
GWA-13DA
Transition Zone
02/08/2018
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-13DA
Transition Zone
05/10/2018
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-13DA
Transition Zone
08/09/2018
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-13DA
Transition Zone
11/09/2018
2.9
81.3
0.12
30.4
2.33
3.4 j
<0.2
2
0.81
0.12
11.9
<0.5
13.4
<0.1
7
9 j
<100
1.6
1.1
11.7
<0.1
<50
<0.08
0.68 Sl
0.014 j
0.76 Sl
<50
GWA-13S
Saprolite
02/08/2018
0.95 SI
148
<0.1
2
0.854
91
<0.2
<0.5
7.8
0.39
<5
<0.5
<5
<0.1
<0.3
<10
<100
<0.5
<0.1
82.2
<0.1
<50
<0.08
1.1
0.27
0.94 SI
62.1
GWA-13S
Saprolite
05/14/2018
0.49 j,S1
186
0.031 j,S1
2 B,S1
1.04
37.9
<0.2
<0.5
3.1 sl
0.94
<5
<0.5
1.3 j
0.055 j
0.069 j,S1
41.7 S1
73 j
<0.5
0.056 j
92.9
0.047 j
<50
0.035 j
1.6
0.039 j
0.5 S1
57.8
GWA-13S
Saprolite
08/09/2018
0.34 j
62.6
<0.1
1.4
0.774
27
<0.2
<0.5
1.4
0.36
<5
<0.5
1.2 j
0.039 j
<0.3
23.5 B,S1
<100
<0.5
0.12 S1
71.3
0.067 j,S1
<50
0.058 j
1.1 S1
0.022 j,S1
1.8 S1
<50
GWA-13S
Saprolite
11/09/2018
1
156
0.094 j
1.2 j
0.947
18.8
<0.2
<0.5
1.4
0.4
<5
<0.5
1.47 j
0.028 j
0.42
44
<100
<0.5
0.051 j
80.4
0.033 j
<50
<0.08
0.76 Sl
0.024 j
0.81 Sl
26.8 j
GWA-14D
Transition Zone
02/08/2018
0.73 SI
<50
<0.1
2.3
1.14
7.8
<0.2
IA SI
1 S1
0.38
<5
<0.5
7.14
<0.1
3.2
<10
<100
<0.5
0.29
20.6
<0.1
<50
<0.08
1.1
<0.1
<0.5
<50
GWA-14D
Transition Zone
05/14/2018
0.66 SI
55.8
0.056 j,B,SI
2.4 S1
1.17
8.3
<0.2
0.42 j
0.49 j
0.46
<5
<0.5
7.76
<0.1
3
7.4 j,S1
<100
0.17 j
0.37
21.1
<0.1
28.4 j
<0.08
1 s1
<0.1
0.84 SI
<50
GWA-14D
Transition Zone
08/09/2018
2.9
492
0.3
4
1.63
45.6
<0.2
1.6
1.7
0.095
<5
<0.5
8.78
<0.1
2.4
23.5 B,S1
<100
0.97
0.72
20.1
<0.1
<50
0.11
0.55 n
0.08 j,S1
1.3 S1
<50
GWA-14D
Transition Zone
11/08/2018
2.6 sl
327
0.45
2.9
1.45
31.2
<0.2
1.1
1.5
0.23
<5
<0.5
8.66
<0.1
2.9
15.6 B
<100
0.41 j
0.43
18.7
0.024 j
<50
0.087
0.48 j,S1
0.031 j
2.4 SI
<50
GWA-14S
Saprolite
02/08/2018
1 S1
284
<0.1
1.5
0.644
33.4
<0.2
3.2
1.3 S1
0.62
<5
<0.5
<5
<0.1
<0.3
<10
<100
<0.5
0.34
31.8
<0.1
<50
<0.08
0.96
0.2
0.87 SI
<50
GWA-145
Saprolite
05/14/2018
0.35 j,S1
55.5
<0.1
1.2 Sl
0.679
19.1
<0.2
<0.5
0.2 j,S1
0.69
<5
<0.5
2.15 j
0.058 j
0.086 j,S1
4 j,S1
<100
<0.5
<0.1
33.6
0.067 j
36.7 j
<0.08
0.32 j,S1
0.084 j
0.41 j,S1
<50
GWA-14S
Saprolite
08/09/2018
0.5
606
0.061 j
1.5
0.695
48.5
<0.2
<0.5
0.27 j
0.73
<5
<0.5
1.88 j
0.057 j
0.17 j
5.2 j,B,SI
<100
<0.5
0.067 j,S1
33.4
0.054 j,S1
<50
<0.08
0.37 j,S1
0.097 j,S1
0.92 SI
<50
GWA-145
Saprolite
11/08/2018
0.65 sl
<50
<0.1
1.6 j
0.697
48.1
<0.2
<0.5
<0.5
0.79
<5
<0.5
2.05 j
0.047 j
0.12 j,B,SI
9.3 j,B
<100
<0.5
<0.1
32.9
0.075 j
<50
<0.08
0.81 Sl
0.12
3.1
<50
GWA-15D
Transition Zone
08/09/2018
<0.5
1670
<0.1
9.4
15.5
1210
<0.2
3.1
8.1
0.025
6.52
0.49 j
13.5
<0.1
0.22 j
3.6 j,B,SI
<100
0.095 j
0.24 S1
135
<0.1
SOS
<0.08
0.4 j,S1
3.6
0.14 j,S1
1750
GWA-15D
Transition Zone
11/07/2018
0.92 SI
1190
0.17
8.4
20.3
338
<0.2
2.8
5.3
<0.02
6.55
<0.5
13.6
<0.1
1.5
74.1
<100
<0.5
0.14
70.2
<0.1
41.5 j
<0.08
0.21 j,B,SI
0.86
<0.5
916
GWA-15S
Saprolite
02/12/2018
0.65 B,S1
388
0.12
5.6
25.6
519
<0.2
<0.5
1.8 sl
0.56
8.22
6.9
30.8
<0.1
0.38 S3
<10
<100
<0.5
<0.1
136
0.15
1450
0.31
0.52 SI
1.4
1.1 SS
<50
GWA-15S
Saprolite
05/11/2018
0.49 j
324
0.056 j,S1
5.5
28.8
698
<0.2
0.45 j,S1
1.8
0.49
9.03
7.7
31.3
<0.1
0.35 B,S1
8.8 j
<100
<0.5
0.081 j
142
0.18
1660
0.31
0.25 j,S1
2.1
1.2 n
<50
GWA-15S
Saprolite
08/08/2018
0.51 Sl
484
0.064 j
6.3
25.8
887
<0.2
0.31 j
1.7
0.43
8.1
6
30.8
<0.1
0.23 j
7.7 j,B
53.9 j,Sl
<0.5
0.18 SI
126
0.13
1350
0.26
0.24 j,S1
1.1
2.5
44.9 j
GWA-15S
Saprolite
11/07/2018
0.58 sl
706
<0.1
5.9
27.7
681
<0.2
0.3 j,S1
2.2
0.45
8.37
5.5
31.1
<0.1
0.52
8.1 j,B
<100
<0.5
0.086 j
136
0.14
1470
0.28
0.47 j,B,SI
1.2
1.9 sl
337
MS-08
Saprolite
02/12/2018
<0.5 B
246 Sl
0.11
0.68
1.28
<5
<0.2
<0.5
0.98 Sl
0.14
<5
<0.5
<5
<0.1
3.8
<10
<100
<0.5
0.21
28.3
<0.1
<50
<0.08
3.8 SI
<0.1
0.65 SI
<50
MS-08
Saprolite
05/15/2018
0.96 SI
784 S1
0.16
0.49 j
1.31
9.2 SI
<0.2
0.087 j
1.8 sl
0.13
<5
<0.5
4.27 j
<0.1
4.4
3.2 j
<100
<0.5
0.064 j
23.6
<0.1
<50
<0.08
4
0.037 j
3 Sl
<50
MS-08
Saprolite
08/13/2018
1.5 Sl
2440
0.48
0.62 B
2.17
23.6
<0.2
<0.5
3.2
0.14
<5
<0.5
4.03 j
<0.1
6.9
8.5 j
<100
<0.5
0.076 j
25.8
0.039 j
<50
<0.08
3.5
<0.1
0.54 B
<50
MS-08
Saprolite
11/09/2018
1.1
398
0.17
3.3
1.32
4.8 j
<0.2
0.4 j
1.7
0.13
<5
<0.5
4.13 j
<0.1
4.7
4.2 j
394
<0.5
0.068 j
26.6
0.034 j
<50
<0.08
3.1
0.016 j
0.36 j,S1
273
MS-10
Saprolite
02/12/2018
0.76 B,S1
183 SI
<0.1
2.3
0.316
19.1
<0.2
<0.5
1.4 SI
0.57
<5
<0.5
<5
<0.1
<0.3
<10
<100
<0.5
<0.1
103
0.11
<50
<0.08
0.94 SI
0.42
0.68 S1
<50
MS-10
Saprolite
05/15/2018
0.4 j,S1
598
0.13
2.3
0.329
28
<0.2
<0.5
1.7 Sl
0.51
<5
<0.5
1.85 j
<0.1
0.16 j
5.2 j
<100
<0.5
<0.1
92.6
<0.1
<50
<0.08
<0.5
<0.1
<0.5
<50
MS-10
Saprolite
08/13/2018
0.62 B,S1
76.9
0.063 j
2.1 B
0.326
16.7
<0.2
<0.5
1.4 S1
0.51
<5
<0.5
1.66 j
<0.1
0.39 B,S1
5.9 j
<100
<0.5
<0.1
108
0.14
<50
<0.08
0.82
0.46
0.68 B
<50
MS-10
Saprolite
11/07/2018
0.59 sl
238
0.18
2.3 j
0.329
19.6
<0.2
<0.5
1.3
0.42
<5
<0.5
1.65 j
<0.1
0.73
7.7 j
<100
<0.5
<0.1
89.6
0.12
<50
<0.08
0.82 B,S1
0.41
0.58 SI
<50
MS-11
Saprolite
02/12/2018
0.89 B,S1
240 SI
<0.1
0.83
1.34
10.4
<0.2
<0.5
1.5 sl
0.1
<5
<0.5
<5
<0.1
<0.3
<10
<100
<0.5
<0.1
70.7
<0.1
<50
<0.08
2.9 SI
<0.1
0.95 SI
84.5
MS-11
Saprolite
05/15/2018
2.1
377
0.21
0.83
1.17
29
<0.2
<0.5
1.7 Sl
0.019 j
<5
<0.5
5.07
0.036 j
0.2 j
4.6 j
<100
<0.5
<0.1
78.6
0.093 j
<50
<0.08
3.2
0.24
2.1
98.7
MS-11
Saprolite
08/13/2018
1 sl
213
0.055 j
0.61 B
1.03
10.8
<0.2
<0.5
1.6 SI
0.019 j
<5
<0.5
2.87 j
<0.1
0.62 B,S1
5.6 j
<100
<0.5
<0.1
69.1
0.077 j
<50
<0.08
2.6
0.1
1.1 B
80
MS-11
Saprolite
11/09/2018
0.9
1280
<0.1
0.68 j
1.24
33.4
<0.2
<0.5
1.4
<0.02
<5
<0.5
3.19 j
0.015 j
0.28 j
<10
<100
<0.5
0.063 j
83.7
0.06 j
<50
<0.08
2.7
0.28
1.9
600
MS-13
Saprolite
05/15/2018
0.2 j,S1
<50
<0.1
0.78
1.2
11.8
<0.2
<0.5
1.1 sl
1.3
<5
<0.5
3.06 j
<0.1
0.47
2.5 j
<100
<0.5
0.07 j
77.9
0.21
<50
0.03 j
0.37 j
0.023 j
1.8
<50
MS-13
Saprolite
08/13/2018
0.31 j,B,SI
<50
<0.1
0.53 B
1.27
13.6
<0.2
<0.5
0.59 sl
1.3
<5
<0.5
3.3 j
<0.1
0.84 B,S1
4.6 j
<100
<0.5
0.087 j
91.1
0.26
<50
<0.08
0.32 j
0.028 j
1.6
<50
MS-13
Saprolite
11/09/2018
0.5 j
<50
<0.1
1.5 j
1.26
14
<0.2
<0.5
<0.5
1.4
2.55 j
<0.5
3.62 j
<0.1
0.48
4.8 j
<100
<0.5
0.071 j
87.6
0.26
<50
0.059 j
0.59 SI
0.082 j
2
38.3 j
MW-01
Saprolite
02/07/2018
<0.5
<50
<0.1
2
14.6
32
<0.2
<0.5
3.2
0.18
6.38
0.98
16
<0.1
0.71
14.6
<100
<0.5
0.14
308
0.18
196
0.15
3.7
<0.1
0.88 SS
<50
MW-01
Saprolite
05/09/2018
0.65 B
860
0.17
2.2
15.1
38.7
<0.2
<0.5
2.5
0.18
6.66
1.1
16.3
<0.1
1.3 S3
14.5
<100
<0.5
0.058 j
298
0.17
167
0.16
4.2
0.05 j
0.24 j,B
<50
MW-01
Saprolite
08/07/2018
0.75 B
2120
0.36
2.4 B
15.6
57.7
<0.2
<0.5
2.4
0.17
7.78
1
17.4
<0.1
2.5
19.6 B,S1
<100
<0.5
0.066 j
323
0.11
171
0.14
4.6
0.062 j
2.5
<50
MW-01
Saprolite
11/08/2018
0.62 SI
706
0.32
2.2 j
15.9
50.6
<0.2
<0.5
2.4
0.16
7.03
0.86
16.9
<0.1
2.4
18.3 B
<100
<0.5
0.051 j
343
0.17
178
0.16
3.6
0.11
0.26 j,S1
47.7 j
MW-02
Saprolite
02/08/2018
<0.5
<50
<0.1
1.2
13.4
15.4
<0.2
<0.5
0.56
0.64
<5
31.8
31.5
<0.1
0.94
<10
<100
<0.5
0.17
42
0.14
2750
0.091
<0.5
<0.1
IA SI
<50
MW-02
Saprolite
05/09/2018
0.15 j,B
<50
<0.1
1.3
13.1
14.7
<0.2
<0.5
0.32 j
0.63
2.86 j
28.6
30.2
<0.1
1.1 51
2.7 j
<100
<0.5
0.1
37.6
0.14
2620
0.088
0.29 j
0.034 j
1.9 B
<50
MW-02
Saprolite
08/07/2018
<0.5
<50
<0.1
1.6 B
12.7
14.8
<0.2
<0.5
0.27 j
0.64
2.94 j
29.3
31.4
<0.1
0.92
4.9 j,B,SI
<100
<0.5
0.1
41.4
0.12
2840
0.079 j
0.28 j
0.03 j
0.39 j,S1
<50
MW-02
Saprolite
11/07/2018
0.18 j,51
<50
<0.1
1.3 j
12.6
14.5
<0.2
0.35 j,51
0.45 j
0.56
2.71 j
23.9
28.5
<0.1
1.1
5.1 j
<100
<0.5
0.12
37.4
0.13
2680
0.079 j
0.15 j,B,SI
0.037 j
0.18 j,BC,S1
<50
MW-03 CAMA
Saprolite
02/12/2018
0.9 SI
645
0.61
1.4
3.7
49.1
<0.2
<0.5
2.4 S1
4.9 M1,113
<5
<0.5
5.6
<0.1
<0.3
14.3
<100
<0.5
<0.1
253
0.58
<50
<0.08
1.9 sl
8.6
1.3 B,S1
<50
MW-03
Saprolite
05/14/2018
0.78 SI
102
0.16 SI
1.3 Sl
3.59
48.9
<0.2
<0.5
2.1 S1
4.9
<5
<0.5
5.57
0.062 j
<0.3
15.1 Sl
53.3 j
<0.5
<0.1
235
0.53
<50
0.033 j
1.4 S1
8.3
2.4
<50
MW-03
Saprolite
08/13/2018
0.33 j,B,SI
205
0.22 B
1.1
3.84
42.4
<0.2
<0.5
2
4.8
<5
<0.5
5.51
0.048 j
<0.3
15.8 B
<100
<0.5
<0.1
227
0.54
<50
0.028 j
1.7
8.6
4.8
<50
MW-03
Saprolite
11/09/2018
0.89
823
1.5
2.1 j
3.95
54.4
<0.2
<0.5
3
4.9
2.6 j
<0.5
1 5.5
0.043 j
1 1.5
18.3
<100
<0.5
<0.1
259
0.55
<50
1 <0.08
1.4
1 7.5
0.81 SS
<50
Page 26 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
RADIONUCLIDES
OTHER PARAMETERS
Lead
(0.45u)
Manganese
(0.45u)
Mercury
(0.45u)
Molybdenum
(0.45u)
Nickel
(0.45u)
Phosphorus
(0.45u)
Selenium
(0.45u)
Silver
(0.45u)
Strontium
(0.45u)
Thallium
(0.45u)
Vanadium
(0.45u)
Zinc
(0.45u)
Radium-226
Radium-228
Total
Radium
Uranium-238
Total
Uranium
Uranium-238
DIS
Carbonate
Alkalinity
Fluoride
Phosphorus
Reporting Units
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pCi/L
pCi/L
pCi/L
ug/mL
ug/mL
ug/mL
mg/L
mg/L
mg/L
15A NCAC 02L Standard
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5A
NE
0.03A
NE
NE
2
NE
Background Threshold Values (Shallow Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
3
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Deep Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
2.8
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Bedrock Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5.7
NE
0.0005
NE
5
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
GWA-12S
Saprolite
08/09/2018
0.047 j
11.5
0.17 j
<0.5
1.3 SI
<0.05
0.2 j
NA
9.5
0.046 j
0.082 j,S1
5.9 j
1.69
0.235 U
1.93
<0.0005
<0.0005
<0.0005
<5
<0.1
<0.05
GWA-12S
Saprolite
11/08/2018
<0.1
14.9
0.34
<0.5
1.1
<0.05
<0.5
NA
9.8
0.042 j
0.088 j
11.1
0.354 U
0.288 U
0.642 U
NA
<0.0005
NA
<5
<0.1
<0.05
GWA-13DA
Transition Zone
02/08/2018
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-13DA
Transition Zone
05/10/2018
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-13DA
Transition Zone
08/09/2018
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
GWA-13DA
Transition Zone
11/09/2018
<0.1
<5
<0.2
2.1
0.54
0.092
<0.5
NA
95.4
<0.1
6.5
5.3 j,S1
NA
NA
NA
NA
NA
NA
<5
0.089 j
0.094
GWA-13S
Saprolite
02/08/2018
<0.1
47.2
<0.2
<0.5
7.9
<0.05
<0.5
NA
<5
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
GWA-13S
Saprolite
05/14/2018
<0.1
15.4
<0.2
<0.5
6.3
<0.05
<0.5
NA
12.1
0.048 j
0.16 j,B
35.2
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
GWA-13S
Saprolite
08/09/2018
<0.1
7.9
<0.2
<0.5
1.6 SI
0.025 j
<0.5
NA
6.7
0.036 j
<0.3
22.6
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
GWA-13S
Saprolite
11/09/2018
<0.1
6.2
<0.2
<0.5
1.3
<0.05 MI
<0.5
NA
8.6
0.015 j
0.12 j
40.2
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
GWA-14D
Transition Zone
02/08/2018
<0.1
5.8
<0.2
<0.5
0.53
0.095
<0.5
NA
54.4
<0.1
3.2
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.079
GWA-14D
Transition Zone
05/14/2018
0.08 j,S1
5.5
<0.2
0.31 j
0.32 j
0.086
<0.5
NA
62
<0.1
3
5.5 j
NA
NA
NA
NA
NA
NA
<5
0.052 j,S1
0.079 M1
GWA-14D
Transition Zone
08/09/2018
0.075 j
14.9
<0.2
1.2
1.3 SI
0.061
<0.5
NA
67.4
<0.1
2.7
13.8
NA
NA
NA
NA
NA
NA
<5
0.082 j
0.076
GWA-14D
Transition Zone
11/08/2018
<0.1
8.3
<0.2
0.72
0.54
0.066
<0.5
NA
60.3
<0.1
2.8
9.8 j
NA
NA
NA
NA
NA
NA
<5
0.06 j
0.075
GWA-14S
Saprolite
02/08/2018
<0.1
26.7
<0.2
<0.5
1.1
<0.05
<0.5
NA
11
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
GWA-14S
Saprolite
05/14/2018
<0.1
16.4
<0.2
<0.5
0.21 j
<0.05
<0.5
NA
14
0.056 j
<0.3
3.7 j
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
GWA-14S
Saprolite
08/09/2018
<0.1
27.4
<0.2
<0.5
0.2 j,S1
0.027 j
<0.5
NA
12.2
0.052 j
0.12 j,S1
2.5 j
NA
NA
NA
NA
NA
NA
<5
<0.1
0.025 j
GWA-14S
Saprolite
11/08/2018
<0.1
31.9
<0.2
<0.5
0.91
<0.05
<0.5
NA
14
0.049 j
0.14 j
16.4
NA
NA
NA
NA
NA
NA
<5
<0.1
0.031 j
GWA-15D
Transition Zone
08/09/2018
<0.1
1090
<0.2
3.2
7.6
0.044 j
0.49 j
NA
884
<0.1
0.23 j,S1
<10
0.88
2.9
3.78
0.00028 j
0.00028 j
0.00022 j
<5
0.3
<0.05
GWA-15D
Transition Zone
11/07/2018
<0.1
311
<0.2
2.6
4.2
0.029 j
<0.5
NA
953
<0.1
0.48 B,S1
41.5
1.02
4.03
5.05
NA
0.0006
NA
<5
0.48
0.038 j
GWA-15S
Saprolite
02/12/2018
<0.1
480
<0.2
<0.5
2 SI
<0.05
7.3
NA
1560
<0.1
<0.3
<10
0.627
0.922
1.549
<0.0005
<0.0005
NA
<5
<0.1
<0.05
GWA-15S
Saprolite
05/11/2018
<0.1
667
<0.2
0.34 j
1.7 Sl
<0.05
7.8
NA
1610
<0.1
0.22 j,S1
7.2 j
0.294 U
1.55
1.84
<0.0005
<0.0005
<0.0005
<5
0.051 j
<0.05
GWA-15S
Saprolite
08/08/2018
0.065 j
686
<0.2
0.24 j,S1
1.8 sl
<0.05
6
NA
1500
<0.1
0.11 j
8.3 j,B
0.293 U
2.6
2.89
<0.0005
<0.0005
<0.0005
<5
0.051 j
0.029 j
GWA-15S
Saprolite
11/07/2018
<0.1
524
<0.2
0.2 j
2.4
0.035 j
6.1
NA
1570
<0.1
0.35 B,S1
7.9 j,S1
0.59 U
1.92
2.51
NA
<0.0005
NA
<5
<0.1
0.058
MS-08
Saprolite
02/12/2018
<0.1
<5
<0.2
<0.5
0.75 S1
0.18
<0.5
NA
88.4
<0.1
3.9
<10
NA
NA
NA
NA
NA
NA
<5
0.1
0.18
MS-08
Saprolite
05/15/2018
<0.1
<5
<0.2
<0.5
2.1
0.17
<0.5
NA
77.4
<0.1
3.6
4.5 j
NA
NA
NA
NA
NA
NA
<5
0.11
0.18 M1,R1
MS-08
Saprolite
08/13/2018
<0.1
<5
<0.2
<0.5
0.79
0.18
<0.5
NA
81.2
<0.1
3.8
52.3
NA
NA
NA
NA
NA
NA
<5
0.11
0.2
MS-08
Saprolite
11/09/2018
<0.1
<5
<0.2
0.71
0.89
0.18
<0.5
NA
79.8
<0.1
3.5
9.3 j,S1
NA
NA
NA
NA
NA
NA
<5
0.11
0.18
MS-10
Saprolite
02/12/2018
<0.1
14.2
<0.2
<0.5
1.4 sl
<0.05
<0.5
NA
15.6
<0.1
<0.3
<10
0.194
0.747
0.941
NA
NA
NA
<5
<0.1
<0.05
MS-10
Saprolite
05/15/2018
<0.1
14.1
<0.2
<0.5
<0.5
<0.05 M1,R1
<0.5
NA
14.8
<0.1
<0.3
6.5 j
0.204 U
0.335 U
0.539 U
<0.0005
<0.0005
<0.0005
<5
<0.1
<0.05
MS-10
Saprolite
08/13/2018
<0.1
14.8
<0.2
<0.5
1.2
<0.05
<0.5
NA
15.9
<0.1
<0.3
4.9 j
0.138 U
6.59
6.73
<0.0005
<0.0005
<0.0005
<5
<0.1
<0.05
MS-10
Saprolite
11/07/2018
<0.1
13.8
<0.2
<0.5
1.1
<0.05
<0.5
NA
15.2
<0.1
0.19 j,B,SI
8.3 j,S1
0.443 U
1.2
1.64 U
NA
<0.0005
NA
<5
<0.1
<0.05
MS-11
Saprolite
02/12/2018
<0.1
5.4
<0.2
<0.5
1.3 sl
<0.05
<0.5
NA
90.9
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
MS-11
Saprolite
05/15/2018
0.065 j
11.9
<0.2
<0.5
1.8
<0.05
<0.5
NA
64.5
0.036 j
<0.3
5.1 j
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
MS-11
Saprolite
08/13/2018
<0.1
7.1
<0.2
<0.5
1.3
<0.05
<0.5
NA
61.8
<0.1
<0.3
3.8 j
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
MS-11
Saprolite
11/09/2018
<0.1
20
<0.2
<0.5
2.1
<0.05
<0.5
NA
71.2
<0.1
0.18 j
15.9 SI
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05 M1,113
MS-13
Saprolite
05/15/2018
0.32
7.6
<0.2
<0.5
0.35 j
0.15
<0.5
NA
315
<0.1
0.4
5.2 j
NA
NA
NA
NA
NA
NA
<5
0.056 j
0.15
MS-13
Saprolite
08/13/2018
<0.1
8.1
<0.2
<0.5
0.49 j
0.17
<0.5
NA
337
<0.1
0.5
3.4 j
NA
NA
NA
NA
NA
NA
<5
0.077 j
0.17
MS-13
Saprolite
11/09/2018
<0.1
16.4
<0.2
<0.5
1
0.16 MI
<0.5
NA
337
<0.1
0.49
5.7 j,S1
NA
NA
NA
NA
NA
NA
<5
<0.1
0.15
MW-01
Saprolite
02/07/2018
<0.1
29.3
<0.2
<0.5
2.5
0.11
0.99
NA
2310
<0.1
0.81
13.8
NA
NA
NA
NA
NA
NA
<5
<0.1
0.087
MW-01
Saprolite
05/09/2018
<0.1
21.7
<0.2
<0.5
2.2
0.081
0.98
NA
2060
<0.1
0.89
11.8
NA
NA
NA
NA
NA
NA
<5
<0.1
0.1
MW-01
Saprolite
08/07/2018
<0.1
18.8
<0.2
<0.5
2.3
0.084
0.97
NA
2130
<0.1
0.63
15.2 B
NA
NA
NA
NA
NA
NA
<5
<0.1
0.14
MW-01
Saprolite
11/08/2018
<0.1
34.8
<0.2
<0.5
2.2
0.09
0.76
NA
2340
<0.1
0.97
13.5
NA
NA
NA
NA
NA
NA
<5
<0.1
0.095
MW-02
Saprolite
02/08/2018
<0.1
14.1
<0.2
<0.5
0.66
0.14
32.4
NA
1520
<0.1
1
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.12
MW-02
Saprolite
05/09/2018
<0.1
12.7
<0.2
<0.5
0.35 j
0.12
30.1
NA
1380
<0.1
1.1
5.5 j
NA
NA
NA
NA
NA
NA
<5
<0.1
0.13
MW-02
Saprolite
08/07/2018
<0.1
14.3
<0.2
<0.5
0.45 j
0.12 M1,R1
29.2
NA
1470
<0.1
0.81
3.9 j,B
NA
NA
NA
NA
NA
NA
<5
<0.1
0.12
MW-02
Saprolite
11/07/2018
<0.1
13.6
<0.2
<0.5
<0.5
0.13
25.7
NA
1470
<0.1
1 B,S1
3.2 j,S1
NA
NA
NA
NA
NA
NA
<5
0.053 j
0.13
MW-03 CAMA
Saprolite
02/12/2018
<0.1
41.6
<0.2
<0.5
2.2 SI
<0.05
<0.5
NA
51.8
<0.1
<0.3
12.8
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
MW-03
Saprolite
05/14/2018
0.031 j,S1
42.5
<0.2
<0.5
1.9
<0.05
<0.5
NA
45
0.051 j
<0.3
15.7
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
MW-03
Saprolite
08/13/2018
0.043 j
34.9
<0.2
<0.5
2.2
0.032 j
<0.5
NA
50.5
0.052 j
<0.3
16.7
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
MW-03
Saprolite
11/ 99/2018
<0.11
36.5
<0.2
<0.5
1.9
<0.05
<0.5
NA
1 53.2
0.049 j
0.086 j
13 Sl
NA
NA
NA
NA
NA
NA
<5
<0.1 M1,R1
0.041 j
Page 27 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
FIELD PARAMETERS
WATER QUALITY PARAMETERS
SELECTED 40CFR257 APPENDIX III CONSTITUENTS plus Sr
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
PH
Water
Level
Temp
Spec
Cond
DO
ORP
Eh
Turbidity
Alkalinity
Bi-
carbonate
Alkalinity
Sulfide
Total
Organic
Carbon
Total
Suspended
Solids
Boron
Calcium
Chloride
Strontium
Sulfate
Total
Dissolved
Solids
Aluminum
Antimony
Arsenic
Barium
Beryllium
Cadmium
Chromium
(VI)
Chromium
Cobalt
Reporting Units
S.U.
ft
Deg C
pmhos/cm
mg/L
mV
mV
NTUs
mg/L
mg/L
mg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
6.5-8.5
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
700
NE
250
NE
250
Soo
NE
1*
10
700
4*
2
10
10
1*
Background Threshold Values (Shallow Unit)
4.6-6.4
NE
NE
NE
NE
NE
NE
NE
63
63
0.1
1
NE
50
10.7
5.5
303
4.2
140
757
0.5
0.4
310
0.2
0.08
5.7
16.5
1.2
Background Threshold Values (Deep Unit)
5.7-6.9
NE
NE
NE
NE
NE
NE
NE
204
204
0.1
1
NE
50
13.1
4.7
665
17.7
183
128
0.5
0.6
127
0.1
0.08
3
7.6
1.9
Background Threshold Values (Bedrock Unit)
5.6-7.6
NE
NE
NE
I NE
NE
NE
NE
1 108
108
0.1
1
NE
50
15
1 4.5
253
18.4
216
300
0.5
0.6
435
1 0.2
0.08
3.9
1 8.3
2.8
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
MW-04
Saprolite
02/09/2018
5.0
39.35
18
45
5.10
185
390
2.5
21.8
21.8
<0.1
<1
<2.5
<50
3.99
1.7
99.2
<1
53
<100
<0.5
<0.1
47.8
<0.1
<0.08
1.6
2 S1
<0.1
MW-04
Saprolite
05/14/2018
5.5
38.35
32
54
5.60
67
272
6.2
22.2
22.2
<0.1
<1
<2.5
<50
3.93
1.7
95.4
<1
45
312 SI
<0.5
0.058 j
49.8
0.056 j
<0.08
1.6
1.8 Sl
0.044 j
MW-04
Saprolite
08/07/2018
5.9
38.88
33
62
0.90
121
326
1.4
23.3
23.3
<0.1
<1
<2.5
<50
4.04
1.9
102
<1
52
99.5 j
<0.5
0.11
53
0.046 j
<0.08
1.8
1.8 B
<0.1
MW-04
Saprolite
11/07/2018
6.0
39.40
21
64
5.80
163
368
3.0
25.7
25.7
<0.1
<1
2.6
<50
4.53
1.8
113
<1
59 D6
76.7 j
<0.5
0.34 S1
52.9
0.031 j
<0.08
1.9
5
0.051 j,SI
MW-04D
Bedrock
02/09/2018
6.2
39.28
15
77
5.70
169
374
2.1
38.3
38.3
<0.1
<1
<2.5
<50
6.1
1.2
191
1.1
80
<100
<0.5
<0.1
40.1
<0.1
<0.08
0.39 M1
<0.5
<0.1
MW-04D
Bedrock
05/14/2018
6.2
38.32
27
82
4.80
156
361
0.2
35.5
35.5
<0.1
<1
<5
<50
6.06
1.3
181
1.2
66
<100
<0.5
0.071 j
38
<0.1
<0.08
0.44
0.54 B,S3
<0.1
MW-04D
Bedrock
08/07/2018
6.2
38.75
24
80
3.70
-82
123
0.9
37
37
<0.1
<1
<2.5
<50
6.15
1.4
200
1.3
82
<100
<0.5
<0.1
43
<0.1
<0.08
0.39
0.6 B,SI
<0.1
MW-04D
Bedrock
11/07/2018
6.2
39.34
21
81
4.80
83
288
0.9
41
41
<0.1
<1
<2.5
<50
6.04
1.4
191
1.3
93
<100
<0.5
0.2 S3
40.3
<0.1
<0.08
0.38
0.61 B,S3
0.03 j,S1
MW-05 LAMA
Saprolite
02/12/2018
5.3
25.36
15
40
2.80
1
206
9.8
11.9
11.9
<0.1
<1
7.1
<50
0.907
2.1
89.5
1.7
53
458
<0.5
0.24
41.4
0.36
<0.08
0.37
11
0.27
MW-05
Saprolite
05/15/2018
5.4
24.30
17
38
1.90
293
498
9.7
11.7
11.7
<0.1
<1
10.3
<50
1.09
2.3
123
0.89 j
55
584
<0.5
0.14
46.5
0.25
<0.08
0.16
0.34 j,SI
0.077 j
MW-05 LAMA
Saprolite
08/07/2018
5.5
26.02
17
37
2.98
338
543
7.0
13.4
13.4
<0.1
<1
8.2
<50
1.44
2.5
185
<1
52
1930
<0.5
0.25
87.3
0.34
<0.08
0.23 Sl
0.75 Sl
0.09 j
MW-05
Saprolite
11/12/2018
5.5
24.50
8
37
1.50
83
288
6.7
12.5
12.5
<0.1
0.59 j
9.8 D6
31.4 j
1.41
2.6
160
<1
75
984
<0.5
0.35
60
0.43
<0.08
0.31
0.87 Sl
0.21
MW-06D
Transition Zone
02/08/2018
6.0
18.93
13
515
0.30
104
309
9.4
29.3
29.3
<0.1
<1
<2.5
173 Sl
45.4
124
1770
4.9
354
110
<0.5
<0.1
347
<0.1
0.14
0.073 M1,S1
0.74 Sl
0.18
MW-06D
Transition Zone
05/15/2018
5.9
17.42
20
560
0.50
50
255
6.6
25.9
25.9
<0.1
<1
3.7
172
47.8
141
1630
5.4
394
575
<0.5
0.15
343
<0.1
0.13
0.1
5.4 S1
0.28
MW-06D
Transition Zone
08/10/2018
6.0
16.15
24
580
0.60
-101
104
6.0
28.7
28.7
<0.1
<1
<2.5
174
51.2
153
1850
5.7
355
229
<0.5
0.067j
372
<0.1
0.16
0.12
3.4
0.21
MW-06D
Transition Zone
11/07/2018
6.0
16.79
21
598
0.40
-133
72
5.5
29.9
29.9
<0.1
<1
<2.5
158
48.8
144
1800
5.5
374
<100
<0.5
0.045 j,S1
356
<0.1
0.15
0.089
0.54 B,S1
0.19 S1
MW-06S
Saprolite
02/08/2018
4.3
20.43
15
366
2.90
150
355
5.4
<5
<5
<0.1
<1
<2.6
1680
25.1
83.2
57.6
40.9
254 SI
1440
<0.5
1.3
68.4
0.9
0.45
0.19
<0.5
76.9
MW-06S
Saprolite
05/15/2018
4.6
18.87
20
114
2.90
195
400
4.7
<5
<5
<0.1
0.87 j
5.1
285
4.67
9.2
16.4
23.6
77
764
<0.5
0.16
54.4
0.25
0.14
0.088
0.27 j,SI
23.3
MW-06S
Saprolite
08/10/2018
4.5
18.08
24
106
3.80
72
277
1.5
<5
<5
<0.1
<1
<2.5
331
5.7
17.2
14.9
22.6
72
286
<0.5
0.22
53.8
0.22
0.15
0.067
0.31 j,S1
18.8
MW-06S
Saprolite
11/07/2018
4.7
18.18
19
125
2.90
109
314
1.1
<5
<5
<0.1
0.56 j
<5
426
6.53
16.6
17.9
13.4
68
312
<0.5
0.25 S1
63.5
0.3
0.13
<0.025
0.46 j,B,Sl
22
MW-07D
Transition Zone
02/06/2018
7.3
7.38
15
651
0.70
-11
195
2.2
90
90
<0.1
<1
<2.5
329
85.3
103
1490
67.5
443
<100
<0.5
0.17
74.4
<0.1
<0.08
<0.025
<0.5
<0.1
MW-07D
Transition Zone
05/11/2018
7.2
6.48
25
690
0.40
-127
78
0.8
92.7
92.7
<0.1
<1
2.7
353 S1
89
109
1450
73
467 S1
<100
<0.5
0.19 S1
82.2
<0.1
<0.08
<0.025
0.21 j,S1
<0.1
MW-07D
Transition Zone
08/09/2018
7.2
6.15
27
688
0.70
-65
140
1.5
89.6
89.6
<0.1
<1
<2.5
436
98.4
112
1480
75.4
452
63.5 j
<0.5
0.18 S1
85.2
<0.1
<0.08
<0.025
<0.5
0.02 j
MW-07D
Transition Zone
11/06/2018
7.3
6.77
13
703
0.80
-114
91
0.3
94
94
<0.1
<1
<2.5
386
99.6
113
1510
74.5
462
<100
<0.5
0.18
86.7
<0.1
<0.08
0.043
0. 14 j,B,S1
0.019j
MW-07S
Saprolite
02/06/2018
4.5
13.75
14
906
0.90
250
455
4.2
<5
<5
<0.1
<1
20.1
3860
63.9
189
449
98
528
1440
<0.5
4.1
59.2
1.2
0.17
<0.025
15.6
38.1
MW-07S
Saprolite
05/11/2018
4.3
12.89
20
885
0.80
-36
169
0.2
<5
<5
<0.1
<1
<2.5
3520
59.4
182
416
93.8
477 S1
1440
<0.5
2.8
128
1.1
0.18
0.028
0.45 j,S1
40.5
MW-07S
Saprolite
08/09/2018
4.3
12.78
23
824
1.00
-117
88
1.3
<5
<5
<0.1
<1
<2.5
4840
61.9
196
385
88.9
460
1490
<0.5
3.3
149
1.3
0.16
<0.025
0.32 j,S1
40.1
MW-07S
Saprolite
11/06/2018
4.3
13.42
20
850
0.40
271
476
3.1
<5
<5
<0.1
<1
<2.5
4830
65.3
186
395
87.8
437
1440
<0.5
3
92.6
1.3
0.15
0.046
2.2 S1
46.6
MW-08D
Bedrock
02/06/2018
6.5
15.27
15
473
0.40
-42
163
0.4
137
137
<0.1
<1
<2.5
248
74.1 M1
7.8
1680
98.9
351
<100
<0.5
<0.1
11.9
0.11
<0.08
<0.025
<0.5
0.28
MW-08D
Bedrock
05/11/2018
6.5
13.78
21
467
0.30
-127
78
6.0
130
130
<0.1
<1
<5
258 SI
81.8 1g
8.6
1700
98.2
601 S1
421 S1
<0.5
0.11 SI
15.2
0.12
<0.08
<0.025
0.26 j,S1
0.31
MW-08D
Bedrock
08/07/2018
6.4
13.68
34
484
0.50
-236
-31
1.0
132
132
<0.1
<1
<2.5
279
85.8
8.4
1860
105
344
<100
<0.5
0.1
15
0.11
<0.08
<0.025
<0.5
0.29
MW-08D
Bedrock
11/06/2018
6.5
14.85
20
470
0.40
-227
-22
0.7
132
132
<0.1
<1
<2.6
290
85.7
8.2
1740
99.8
349
<100
<0.5
0.087j
14.6
0.095j
<0.08
<0.025
0.31 j,B,SI
0.28
MW-08S
Saprolite
02/06/2018
6.5
17.15
15
798
1.10
20
225
8.0
479
479
<0.1
3.1
2.8
224
129
1.7
1700
39.5
506
<100
<0.5
0.31
168
<0.1
<0.08
<0.025
<0.5
1.2
MW-08S
Saprolite
05/11/2018
6.6
15.71
21
796
0.30
-127
78
5.5
407
407
<0.1
2.6
<2.5
220 S1
111
2
1730
38.1
748
<100
<0.5
0.36 S1
142
<0.1
<0.08
<0.025
0.39 j,S1
0.82
MW-08S
Saprolite
08/07/2018
6.5
15.56
37
546
2.70
-26
180
1.5
427
427
<0.1
3
<2.7
258
129
1.9
2220
37.9
503
<100
<0.5
0.16
141
<0.1
0.032j
0.085 SI
0.2 j,S1
0.63
MW-08S
Saprolite
11/06/2018
6.6
16.75
20
777
1.00
-17
188
0.6
433
433
<0.1
2.9
<2.5
292
117
1.4
1610
35.6
488
<100
<0.5
0.26
150
<0.1
<0.08
0.079
0.91 B,S1
1
MW-09D
Transition Zone
02/06/2018
5.9
18.40
18
462
0.50
79
284
5.2
36.3
36.3
<0.1
<1
<5
447
60
6
1170
167
348
<100
<0.5
<0.1
81.1
<0.1
0.14
0.027
<0.5
1.3
MW-09D
Transition Zone
05/11/2018
5.6
16.76
28
468
0.80
-141
64
0.4
36.1
36.1
<0.1
<1
<5
466 S1
57
6.4
1180
162
327 S1
<100
<0.5
0.085 j,S1
89.2
0.058j
0.14
<0.025
0.3 j,SI
1.5
MW-09D
Transition Zone
08/07/2018
5.7
16.75
35
471
0.30
32
237
1.1
35
35
<0.1
<1
<2.5
497
64.7
6.7
1240
181
348
<100
<0.5
<0.1
93.2
<0.1
0.12
0.035 S1
0.17 j,B,Sl
1.4
MW-09D
Transition Zone
11/06/2018
5.9
17.98
20
462
0.90
-65
140
0.5
36.1
36.1
<0.1
0.59j
<2.5
484
61
6.7
1140
174
349
<100
<0.5
0.053j
82.2
0.05j
0.12
0.044
0.23 j,B,SI
1.5
MW-09S
Saprolite
02/06/2018
6.9
16.97
16
609
2.50
-14
191
1.0
217
217
<0.1
1.4
<2.5
<50
72.3
14
1050
62.1
425
<100
<0.5
<0.1
244
<0.1
<0.08
0.19
0.75
<0.1
MW-09S
Saprolite
05/11/2018
6.7
14.33
32
650
1.90
-132
73
0.8
210
210
<0.1
1.2
<5
<50
71.3 M1
13.8
1130
75.9
530 S1
<100
<0.5
0.086 j,S1
276
<0.1
<0.08
0.42 M1
0.77 S1
0.039j
MW-09S
Saprolite
08/07/2018
6.6
16.05
36
651
0.90
-194
11
3.9
196
196
<0.1
0.89j
<2.5
<50
78.2
14.4
1120
86.5
422
<100
<0.5
0.053j
276
0.039j
0.033j
0.21 S1
0.42 j,B,SI
0.026j
MW-09S
Saprolite
11/06/2018
6.6
14.35
19
640
1.30
161
366
1.0
205
205
<0.1
1.4
<2.6
<50
78.7
14.1
1100
88.2
415
<100
<0.5
0.074j
251
0.011j
<0.08
0.5
0.66 B,S1
0.019j
MW-SOD
Transition Zone
02/09/2018
6.4
15.40
13
59
2.60
6
211
0.4
22.1
22.1
<0.1
<1
<2.5
<50 1g
8.1
1.2
96.4
3.4
67
<100
<0.5
<0.1
18
<0.1
<0.08
0.34
0.63 S1
<0.1
MW-lOD
Transition Zone
05/11/2018
6.4
13.92
25
59
3.40
123
328
1.1
21.3
21.3
<0.1
<1
<2.5
<50
3.68
1.2
93.5
3.6
64 D6,S1
<100
<0.5
0.058 j,S1
17
<0.1
<0.08
0.52
0.6 S1
<0.1
MW-SOD
Transition Zone
08/10/2018
6.4
14.35
26
61
2.30
143
348
0.8
22.3
22.3
<0.1
<1
<2.5
<50
4.15
1.4
99
3.8
75
<100
<0.5
0.055 j
18.2
<0.1
<0.08
0.4
0.56 Sl
<0.1
MW-101D
Transition Zone
11/07/2018
6.4
15.15
16
58
2.40
33
238
1.0
23.1
23.1
<0.1
<1
<2.5
<50
3.99
1.3
95.7
3.7
75
<100
<0.5
0.069 j,S1
18.2
<0.1
<0.08
0.4
0.55 B,SI
<0.1
MW-SOS
Saprolite
02/09/2018
5.2
15.60
14
18
7.50
275
480
0.9
1 <5
<5
<0.1
<1
<2.5
<50
0.119
<1
<5
<1
<25
<100
<0.5
<0.1
42.7
<0.1
<0.08
0.16
<0.5
<0.1
MW-30S
Saprolite
05/11/2018
4.6
14.08
24
20
4.70
105
310
5.9
6.5
6.5
<0.1
<1
<2.5
<50
0.158 S3
0.99 j
4.5 j
<1
<25
331 SI
<0.5
<0.1
42.7
0.11
0.029 j
0.17 P4, R0
0.58 SI
0.065 j
MW-SOS
Saprolite
08/10/2018
5.2
14.68
25
19
1 7.00
53 j
258
1.0
1 5.7
5.7
<0.1
<1
<2.5
<50
0.106
0.99 j
3.8 j
<1
<25
<100
<0.5
<0.1
43.8
0.071 j
0.03 j
0.16
0.25 j,S1
0.047 j
MW-30S
Saprolite
11/07/2018
5.2
15.23
17
19
4.30
-15
191
5.4
5.1
5.1
<0.1
<1
<2.5
<50
0.13
0.96 j
4.2 j
<1
25
<100
<0.5
1 <0.1
1 43.8
0.084 j
<0.08
0.12
0.25 j,B,Sl
0.076 j,SI
Page 28 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
Copper
Iron
Lead
Lithium
Magnesium
Manganese
Mercury
Molybdenum
Nickel
Nitrate
+ Nitrite
Potassium
Selenium
Sodium
Thallium
Vanadium
Zinc
Aluminum
(0.45u)
Antimony
(0.45u)
Arsenic
(0.45u)
Barium
(0.45u)
Beryllium
(0.45u)
Boron
(0.45u)
Cadmium
(0.45u)
Chromium
(0.45u)
Cobalt
(0.45u)
Copper
(0.45u)
Iron
(0.45u)
Reporting Units
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
mg-N/L
mg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
1000
300
15
NE
NE
50
1
NE
100
NE
NE
20
NE
0.2*
0.3*
1000
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Shallow Unit)
3.8
744
0.3
NE
1.8
75.3
0.2
0.5
9.9
2.7
5
0.5
9.1
0.1
5.6
19.2
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Deep Unit)
2.8
272
0.1
NE
14.4
141
0.2
3.2
7.5
1.4
7.8
0.5
29.2
0.1
3.8
17
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Bedrock Unit)
4.2
792
0.2
NE
13.2
26.6
0.2
3
7.2
0.4
9.8
0.5
14
1 0.1
16
1 11.9
1 NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
MW-04
Saprolite
02/09/2018
<0.5
<50
<0.1
0.76 B
0.787
<5
<0.2
<0.5
0.57 SI
0.03
<5
<0.5
<5
<0.1
0.87
<10
<100
<0.5
<0.1
48.8
<0.1
<50
<0.08
1.8S1
<0.1
0.7 S1
52.6
MW-04
Saprolite
05/14/2018
0.17 j,S1
386
0.095 j,B,SI
0.89 Sl
0.765
7.5
<0.2
0.1 j
0.34 j,S1
0.031 Sl
<5
<0.5
4.5 j
<0.1
1.2
<10
<100
<0.5
0.056 j
46.5
0.043 j
<50
<0.08
1.7
<0.1
0.42 j,S1
<50
MW-04
Saprolite
08/07/2018
0.44 j,B
107
0.044 j,B
0.84
0.787
2.9 j
<0.2
<0.5
0.36 j,B
0.046
<5
<0.5
4.75 j
<0.1
0.94
6.7 j,S1
<100
<0.5
0.078 j
44.7
0.041 j
<50
<0.08
1.6
<0.1
1.3 S1
<50
MW-04
Saprolite
11/07/2018
0.26 j,S1
131
<0.1
0.96 j
0.881
3.4 j
<0.2
0.41 j,S1
2.2
0.025
<5
<0.5
4.95 j
<0.1
1.4
3.6 j
<100
<0.5
0.13
42.6
0.032 j
<50
<0.08
1.7
0.026 j
0.72 BC,S1
<50
MW-04D
Bedrock
02/09/2018
0.59 S1
97.3 SI
<0.1
4.6
1.41
<5
<0.2
<0.5
<0.5
0.026
<5
<0.5
8.2
<0.1
2.5
<10
<100
<0.5
<0.1
41.2
<0.1
<50
<0.08
<0.5
<0.1
<0.5
<50
MW-04D
Bedrock
05/14/2018
0.15 j,S1
50.4
<0.1
4.2 SI
1.37
<5
<0.2
0.31 j
0.33 j,S1
0.022 Sl
<5
<0.5
8.01
<0.1
2.6
<10
<100
<0.5
0.061 j
38.3
<0.1
<50
<0.08
0.4 j,S1
<0.1
0.55S1
<50
MW-04D
Bedrock
08/07/2018
0.28 j,B
88.6
<0.1
4.7
1.36
2.8 j
<0.2
0.29 j
0.33 j,B
0.021
<5
<0.5
8.27
<0.1
2.5
31 ,S1
<100
<0.5
0.065 j
37.2
<0.1
<50
<0.08
0.69
<0.1
0.44 j,S1
<50
MW-04D
Bedrock
11/07/2018
0.22 j,S1
<50
<0.1
3.8
1.33
<5
<0.2
0.41 j,S1
<0.5
0.02 j
<5
<0.5
7.82
<0.1
2.7
<10
<100
<0.5
0.092 j
34.6
<0.1
<50
<0.08
0.44 j,B,SI
<0.1
0.68 BC,S1
<50
MW-05 LAMA
Saprolite
02/12/2018
0.96 SI
356
0.5
0.63
0.647
15.7
<0.2
<0.5
9.2 S1
<0.02
<5
<0.5
5.94
<0.1
<0.3
<10
<100
<0.5
<0.1
33.2
0.23
<50
<0.08
4.7 S1
0.22
1.5 B,S1
<50
MW-05
Saprolite
05/15/2018
0.76 SI
366
0.36
0.34 j
0.728
17.7
<0.2
<0.5
0.58 sl
<0.02
<5
<0.5
5.25
<0.1
0.56
3.2 j
<100
<0.5
<0.1
35
0.21
<50
<0.08
1.8
0.053 j
0.71
<50
MW-05 LAMA
Saprolite
08/07/2018
0.64 B
1550
0.83
0.79 B
0.952
19.2
<0.2
<0.5
0.36 j
0.017 j
<5
<0.5
5.04
<0.1
0.5 51
5.9 j,B,SI
<100
<0.5
0.056 j
41.5
0.18
<50
<0.08
0.44 j
<0.1
0.62 SI
<50
MW-05
Saprolite
11/12/2018
1.3
667
0.93
1.4 j,S1
0.866
12.9
<0.2
1.1
0.98
<0.02
<5
<0.5
4.84 j
0.033 j
1.5
5.9 j
220
<0.5
0.084 j
41.8
0.22
<50
<0.08
0.42 j
0.044 j
0.76 S1
69.5 S1
MW-06D
Transition Zone
02/08/2018
1.5 Sl
153
<0.1
3.2
15.5
6.5
<0.2
<0.5
2 SI
<0.02
5.1
<0.5
16.8
<0.1
0.38S1
14.1
<100
<0.5
<0.1
319
<0.1
164
0.14
0.65
0.17
1.7 S1
<50
MW-06D
Transition Zone
05/15/2018
2.4
719
0.27
3.1
16.8
14.8
0.25
0.21 j
19.7
0.18
5.33
0.29 j
17.3
<0.1
0.71
17.9
<100
<0.5
<0.1
307
0.13
146
<0.08
1.3
0.41
1.4
25.2 j
MW-06D
Transition Zone
08/10/2018
1.5 Sl
239
0.11
3.2
17.3
10.1
<0.2
0.16 j
3.4
<0.02
5.43
0.23 j
17.8
<0.1
0.2 j,S1
17.5 B,S1
<100
<0.5
<0.1
336
<0.1
154
0.16
1.2
0.19
1.8 S1
<50
MW-06D
Transition Zone
11/07/2018
1.4 S1
39.7 j
<0.1
2.8
17.2
5.8
0.079 j
<0.5
1.7
<0.02
5.21
<0.5
17.2
<0.1
0.28 j
18.2 B
<100
<0.5
0.056 j
333
<0.1
150
0.15
0.17 j,B,SI
0.2
2.5 BC,S1
<50
MW-06S
Saprolite
02/08/2018
18.8
<50
0.27 Sl
3.6
16.6
3300
0.26
<0.5
8.4
1.2
<5
3.5
<5
0.22
<0.3
88.2
1290
<0.5
0.87
63.2
0.97
1530
0.46
0.51
72.3
18.2
<50
MW-065
Saprolite
05/15/2018
6.3
768
0.22
1.8
3.69
628
<0.2
<0.5
2.3 Sl
0.48
<5
<0.5
2.4 j
0.11
<0.3
24.1
295
0.24 j
0.23
44.6
0.26
408
0.12
1.6
16.5
5.8
<50
MW-06S
Saprolite
08/10/2018
5.9
27.3 j
0.18
1.6
4.1
733
<0.2
<0.5
1.4
0.62
<5
<0.5
2.87 j
0.098 j
<0.3
27.2 S1
204
<0.5
0.13
48.4
0.2
251
0.11
0.41 j
17.3
5.6
53.5 B,2g
MW-065
Saprolite
11/07/2018
6
462
0.16
1.9 j
4.46
844
<0.2
<0.5
1.5
0.59
<5
<0.5
2.94 j
0.1
0.14 j
28.7 B
243
<0.5
0.25
51.2
0.26
319
0.1
0.69 B,S1
17.1
6.4 BC
346
MW-07D
Transition Zone
02/06/2018
<0.5
1020
<0.1
8.6
8.99
721
<0.2
<0.5
<0.5
<0.02
<5
<0.5
13.7
<0.1
<0.3
<10
<100
<0.5
<0.1
75.8
<0.1
305
<0.08
<0.5
<0.1
<0.5
873
MW-07D
Transition Zone
05/11/2018
<0.5
917
<0.1
8.5
9
676
<0.2
0.29 j,S1
0.14 j
<0.02
4.16 j
<0.5
13.3
<0.1
<0.3
<10
<100
<0.5
0.2
78.6
<0.1
324
<0.08
<0.5
<0.1
<0.5
931
MW-07D
Transition Zone
08/09/2018
0.13 j
974
<0.1
9.2
10.1
775
<0.2
0.28 j
0.27 j
<0.02
4.12 j
<0.5
14.2
<0.1
<0.3
2.6 j,S1
<100
<0.5
0.2 S1
81.7
<0.1
359
<0.08
<0.5
0.02 j,S1
0.21 j,S1
941
MW-07D
Transition Zone
11/06/2018
0.12 j,S1
1010
<0.1
8.4
10
772
<0.2
0.31 j
<0.5
<0.02
4.18 j
<0.5
14.6
<0.1
0.078 j,Sl
<10
<100
<0.5
0.14
81
0.024 j
364
<0.08
0.44 j,B,SI
0.023 j
3.1
949
MW-07S
Saprolite
02/06/2018
0.92
138
0.36
3
31.2
4240
<0.2
<0.5
7.2
0.48
<5
1.9
6.36
0.4
<1.5 D3
22.4
1380
<0.5
6.2
75.6
1.2
3570
0.16
3.9
41.7
1.6
<50
MW-075
Saprolite
05/11/2018
0.44 j
<50
0.43 Sl
2.8
30
4060
0.28
<0.5
1.3
0.71
4.62 j
1.8
6.26
0.36
0.097 j,S1
19
1390
<0.5
3.3
115
1.2
3570
0.17
0.17 j,S1
38.5
5.2
<50
MW-07S
Saprolite
08/09/2018
0.49 j
27.6 j
0.52
3.6
31.9
4410
0.14 j
<0.5
1.2
0.45
5.09
2.3
6.35
0.46
<0.3
21.7 S1
1380
<0.5
3.4
141
1.3
4560
0.16
0.46 j,S1
40
1.9 SS
<50
MW-075
Saprolite
11/06/2018
2.8 sl
31.2 j
0.5
3.3
32.8
4480
0.17 j
<0.5
2.3
0.45
4.5 j
0.96
6.44
0.58
0.16 j,S1
22.8
1340
<0.5
2.4
87.7
1.2
4580
0.44
3.4
42.9
1.6
<50
MW-08D
Bedrock
02/06/2018
<0.5
756
<0.1
6.6
4.68
114
<0.2
<0.5
<0.5
<0.02
<5
<0.5
10.6
<0.1
<0.3
<10
<100
<0.5
0.13
13.8
0.11
242
<0.08
<0.5
0.35
<0.5
664
MW-08D
Bedrock
05/11/2018
0.46 j
1040
0.14 sl
6.6
4.94
112
<0.2
0.14 j,S1
0.33 j
<0.02
2.99 j
<0.5
11
<0.1
0.43 B,Sl
<10
<100
<0.5
0.098 j
13.3
0.11
309
<0.08
<0.5
0.32
0.51S1
709
MW-08D
Bedrock
08/07/2018
0.42 j,B
770
<0.1
6.5
5.08
111
<0.2
0.14 j
0.14 j
<0.02
3.32 j
<0.5
11.8
<0.1
<0.3
3.21 B,SI
<100
<0.5
0.1
13.3
0.053 j
247
<0.08
<0.5
0.3
0.38 j,S1
707
MW-08D
Bedrock
11/06/2018
0.25 j,S1
880
<0.1
6.5
4.93
109
0.077 j
0.18 j
<0.5
<0.02
2.92 j
<0.5
11.6
<0.1
0.13 j,S1
<10
<100
<0.5
0.068 j,BC
13.1
0.077 j
248 B
<0.08
0.7 B,S1
0.33
0.29 j,S1
735
MW-08S
Saprolite
02/06/2018
0.85
2590
<0.1
0.55
24.3
3610
<0.2
0.54
0.92
0.3
12.4
43.3
12.7
<0.1
1.1
<10
<100
<0.5
0.1
142
<0.1
207
<0.08
<0.5
1.4
1
735
MW-085
Saprolite
05/11/2018
0.51
1070
<0.1
0.56
25.6
2650
<0.2
1.7
1.2
<0.02
11.2
2.5
12.9
<0.1
1.1
<10
<100
<0.5
0.15
111
<0.1
337
<0.08
0.51 Sl
0.36
5.5
<50
MW-08S
Saprolite
08/07/2018
0.36 j,B
58.8
<0.1
0.67 B
26.7
3040
<0.2
2.5
1.4
<0.02
13.4
0.48 j
16.2
<0.1
0.11 j,S1
3.6 j,B,SI
<100
<0.5
0.16
115
<0.1
223
<0.08
<0.5
0.6
0.87 SI
30.6 j
MW-08S
Saprolite
11/06/2018
0.72 SI
247
<0.1
0.86 j,B
23.4
1320
0.078 j
4.2
1.7
<0.02
15.5 j
<0.5
13.2
<0.1
0.28 j,S1
2.8 j
<100
<0.5
0.28
140
<0.1
254 B
<0.08
0.2 j,B,SI
0.97
1 S1
199
MW-09D
Transition Zone
02/06/2018
3.1
<50
<0.1
5.1
9.49
958
<0.2 M1
<0.5
4.4
<0.02
<5
<0.5
11.4
<0.1
0.55
<10
<100
<0.5
0.1
82.9
<0.1
415
0.15
<0.5
1.4
3.1
<50
MW-09D
Transition Zone
05/11/2018
2.5
<50
0.035 j,S1
5.3
8.84
932
<0.2
0.11 j,S1
5
0.012 j
3.62 j
<0.5
11.4
<0.1
0.64 B,Sl
6.3 j
<100
<0.5
0.079 j
85.3
0.049 j
442
0.16
0.17 j,S1
1.4
2.9 S1
<50
MW-09D
Transition Zone
08/07/2018
2.6
<50
0.043 j,B
5.6
9.82
986
<0.2
0.12 j
4.4
<0.02
3.86 j
0.15 j
12.9
<0.1
0.48S1
8.9 j,S1
<100
<0.5
0.079 j
81.2
0.052 j
450
0.14
<0.5
1.4
0.86 SI
<50
MW-09D
Transition Zone
11/06/2018
2.7 sl
63.9
<0.1
4.8
9.42
989
<0.2
0.12 j
4.6
<0.02
3.33 j
<0.5
11.9
<0.1
0.48S1
6.4 j
<100
<0.5
0.074 j
79.2
0.04 j
441
0.066 j
0.37 j,B,SI
1.5
0.87 S1
<50
MW-09S
Saprolite
02/06/2018
<0.5
<50
0.37
1.3
15.8
<5
<0.2
<0.5
<0.5
12.3
5.01
<0.5
29.5
<0.1
1.9
<10
<100
<0.5
<0.1
256
<0.1
<50
<0.08
<0.5
<0.1
<0.5
<50
MW-09S
Saprolite
05/11/2018
0.38 j
<50
0.22 SI
1.2
15.3
<5
<0.2
0.19 j,S1
0.31 j
11
5.33
0.37 j
29.4
0.032 j
1.8
<10
<100
<0.5
0.076 j
248
<0.1
64.4
<0.08
0.51 S1
<0.1
1.7 S1
<50
MW-09S
Saprolite
08/07/2018
0.49 j,B
<50
<0.1
1.1
16.5
41.9
<0.2
0.19 j
0.27 j,B
11.4
5.22
0.59
29.6
<0.1
1.8
3.3 j,S1
<100
<0.5
0.098 j
237
<0.1
<50
0.043 j
0.49 j
0.025 j
1.5 Sl
<50
MW-09S
Saprolite
11/06/2018
1 sl
<50
<0.1
0.87 j
16.9
9.8
<0.2
0.2 j
<0.5
10
5.08
0.45 j
29.4
<0.1
1.9
2.6 j
<100
<0.5
0.12
24.3
0.012 j
<50
<0.08
1.2 B
0.084 j
0.98 SI
<50
MW-10D
Transition Zone
02/09/2018
<0.5
<50
<0.1
2.1
0.632
<5
<0.2
<0.5
<0.5
0.34
<5
<0.5
5.91
<0.1
2.8
<10
<100
<0.5
<0.1
18.1
<0.1
<50
<0.08
0.51 SI
<0.1
<0.5
<50
MW-101)
Transition Zone
05/11/2018
0.22 j
<50
<0.1
2.2
0.686
<5
<0.2
0.38 j,S1
0.35 j
0.32
<5
0.48 j
6.43
<0.1
2.8
3.1 j
<100
<0.5
0.068 j
17.6
<0.1
<50
<0.08
0.51 S1
<0.1
0.38 j,S1
<50
MW-SOD
Transition Zone
08/10/2018
0.28 j,S1
<50
<0.1
2.1
0.707
<5
<0.2
0.46 j
0.43 j
0.3
<5
0.46 j
6.53
<0.1
2.8
4.5 j,B,SI
<100
<0.5
0.055 j
16.2
<0.1
<50
<0.08
0.56
<0.1
1.3 B,S1
<50
MW-lOD
Transition Zone
11/07/2018
0.43 j,S1
26.4 j
<0.1
2.1 j
0.689
<5
<0.2
0.35 j,S1
<0.5
0.31
<5
0.4 j
6.3
<0.1
3
5 j
<100
<0.5
0.068 j
15.9
<0.1
<50
<0.08
0.48 j,B,SI
<0.1
0.59 BC,SI
<50
MW-SOS
Saprolite
02/09/2018
<0.5
<50
<0.1
0.92
1.08
6.7
<0.2
<0.5
1.2 Sl
<0.02
<5
<0.5
<5
<0.1
<0.3
<10
<100
<0.5
<0.1
43.8
<0.1
<50
<0.08
0.52 SI
<0.1
<0.5
<50
MW-10S
Saprolite
05/11/2018
0.48 j
104
0.096 j,S1
0.76
1.03
8.3
<0.2
<0.5
1.5
<0.02
<5
<0.5
0.906 j
<0.1
0.22 j,S1
7 j
<100
<0.5
<0.1
38.9
0.1
<50
<0.08
0.68 Sl
0.061 j
1.7S1
<50
MW-SOS
Saprolite
08/10/2018
0.31 j,S1
<50
0.044 j
0.8
1.1
6.7
<0.2
<0.5
1.2
0.019 j
<5
<0.5
0.674 j
<0.1
<0.3
9.1 j,B,S11
<100
1 <0.5
<0.1
38.4
0.054 j
<50
0.046 j
0.29 j
0.044 j
0.64 B,SI
<50
MW-105
Saprolite
11/07/2018
0.44 j,S1
29.1 j
<0.1
0.97 j
1.12
7.6
<0.2
<0.5
1.2
0.011 j
<5
<0.5
0.839 j
<0.1
0.16 j
8.4 j
I <100
<0.5
<0.1
35.8
0.09 j
<50
<0.08
0.29j,B,S11
0.074 j
1 0.66 BC,S1
1 <50
Page 29 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
RADIONUCLIDES
OTHER PARAMETERS
Lead
(0.45u)
Manganese
(0.45u)
Mercury
(0.45u)
Molybdenum
(0.45u)
Nickel
(0.45u)
Phosphorus
(0.45u)
Selenium
(0.45u)
Silver
(0.45u)
Strontium
(0.45u)
Thallium
(0.45u)
Vanadium
(0.45u)
Zinc
(0.45u)
Radium-226
Radium-228
Total
Radium
Uranium-238
Total
Uranium
Uranium-238
DIS
Carbonate
Alkalinity
Fluoride
Phosphorus
Reporting Units
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pCi/L
pCi/L
pCi/L
ug/mL
ug/mL
ug/mL
mg/L
mg/L
mg/L
15A NCAC 02L Standard
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5A
NE
0.03A
NE
NE
2
NE
Background Threshold Values (Shallow Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
3
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Deep Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
2.8
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Bedrock Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5.7
NE
0.0005
NE
5
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
MW-04
Saprolite
02/09/2018
<0.1
<5
<0.2
<0.5
0.5 sl
0.06
<0.5
NA
89.6
<0.1
0.84
<10
0.501
0.44
0.941
<0.0005
<0.0005
NA
<5
<0.1
0.074
MW-04
Saprolite
05/14/2018
<0.1
<5
<0.2
<0.5
0.29 j
0.055
<0.5
NA
87.9
<0.1
0.69
<10
0.512 U
0.569 U
1.08 U
<0.0005
<0.0005
<0.0005
<5
0.054 j,S1
0.073
MW-04
Saprolite
08/07/2018
<0.1
<5
<0.2
0.076 j
0.14 j
0.052
<0.5
NA
81.9
<0.1
0.53
<10
0.222 U
0.64 U
0.862 U
<0.0005
<0.0005
<0.0005
<5
0.056 j
0.089
MW-04
Saprolite
11/07/2018
<0.1
<5
<0.2
0.14 j
0.81
0.077
<0.5
NA
89.7
<0.1
0.93 B,S1
13 S1
0.127 U
0.865 U
0.992 U
NA
<0.0005
NA
<5
0.058 j
0.1
MW-04D
Bedrock
02/09/2018
<0.1
<5
<0.2
<0.5
<0.5
0.1
<0.5
NA
186
<0.1
2.6
<10
0.528
0.0591
0.5871
<0.0005
<0.0005
NA
<5
<0.1
0.1
MW-04D
Bedrock
05/14/2018
<0.1
<5
<0.2
0.27 j
0.15 j
0.11
<0.5
NA
182
<0.1
2.5
<10
0 U
0.555 U
0.555 U
<0.0005
<0.0005
<0.0005
<5
0.062 j,S1
0.1
MW-04D
Bedrock
08/07/2018
<0.1
<5
<0.2
0.27 j
<0.5
0.1
<0.5
NA
171
<0.1
2.6
<10
0.315 U
-0.433 U
0.315 U
<0.0005
<0.0005
<0.0005
<5
0.067 j
0.1
MW-04D
Bedrock
11/07/2018
<0.1
<5
<0.2
0.29 j
<0.5
0.11
<0.5
NA
173
<0.1
2.5
3.5 j,S1
0.508 U
1.08 U
1.59 U
NA
<0.0005
NA
<5
0.065 j
0.11
MW-05 LAMA
Saprolite
02/12/2018
<0.1
13
<0.2
<0.5
8
<0.05
<0.5
NA
86
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
MW-05
Saprolite
05/15/2018
<0.1
12.1
<0.2
<0.5
1.2
<0.05
<0.5
NA
106
<0.1
<0.3
2.7 j
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
MW-05 LAMA
Saprolite
08/07/2018
<0.1
6.1
<0.2
<0.5
0.31 j
<0.05
<0.5
NA
134
<0.1
<0.3
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
MW-05
Saprolite
11/12/2018
0.1
6.8
<0.2
<0.5
0.86
<0.05
<0.5
NA
119
<0.1
0.16 j
6.4 j
NA
NA
NA
NA
NA
NA
<5
<0.1
0.034 j
MW-06D
Transition Zone
02/08/2018
<0.1
<5
<0.2
<0.5
2
0.055
<0.5
NA
1620
<0.1
<0.3
12.2
1.78
0.0353
1.8153
<0.0005
<0.0005
NA
<5
<0.1
<0.05
MW-06D
Transition Zone
05/15/2018
<0.1
4.9 j
<0.2
<0.5
2.2
<0.05
<0.5
NA
1540
<0.1
0.093 j
13.8
1.66
1.17 B
2.83
0.000075 j
0.000075 j
<0.0005
<5
<0.1
0.056
MW-06D
Transition Zone
08/10/2018
<0.1
5 j
<0.2
0.11 j
2.4
0.04 j
0.2 j
NA
1630
<0.1
0.19 j
13.3 B
2.24
0.275 U
2.52
<0.0005
<0.0005
<0.0005
<5
<0.1
0.042 j
MW-06D
Transition Zone
11/07/2018
<0.1
4.4 j
<0.2
<0.5
2.4
0.052
<0.5
NA
1710
<0.1
0.27 j,B,SI
23.1 S1
2.79
1.95
4.74
NA
<0.0005
NA
<5
<0.1
0.046 j
MW-06S
Saprolite
02/08/2018
0.28
2990
<0.2
<0.5
8.1
<0.05
0.52
NA
52.6
0.23
<0.3
79.1
0.329
1.2
1.529
0.0012
0.0012
NA
<5
0.45
<0.05
MW-06S
Saprolite
05/15/2018
0.5
893
<0.2
<0.5
2.4
<0.05
<0.5
NA
16.9
0.093 j
0.41
28
0.756
0.604 U
1.36 U
0.00023 j
0.00023 j
0.00029 j
<5
0.053 j
<0.05
MW-06S
Saprolite
08/10/2018
0.19
569
<0.2
<0.5
1.5
<0.05
<0.5
NA
11.1
0.088 j
<0.3
19 B
0.291 U
0.357 U
0.648 U
0.00027 j
0.00027 j
0.00023 j
<5
0.071 j
<0.05
MW-06S
Saprolite
11/07/2018
0.18
622
<0.2
<0.5
1.9
<0.05
<0.5
NA
13.7
0.1
0.19 j,B,SI
23.5 S1
0.361 U
1.51
1.87
NA
0.00035 j
NA
<5
0.06 j
<0.05 M1,111
MW-07D
Transition Zone
02/06/2018
<0.1
691
<0.2
<0.5
<0.5
<0.05
<0.5
NA
1320
<0.1 B
<0.3
<10
0.676
3.53
4.206
<0.0005
<0.0005
NA
<5
0.73
<0.05
MW-07D
Transition Zone
05/11/2018
<0.1
695
<0.2
0.28 j
0.19 j,S1
<0.05
<0.5
NA
1360
<0.1
<0.3
<10
2.66
3.34
6
<0.0005
<0.0005
<0.0005
<5
0.96
<0.05
MW-07D
Transition Zone
08/09/2018
0.069 j
711
<0.2
0.28 j
0.26 j,S1
0.042 j
<0.5
NA
1360
<0.1
<0.3
<10
1.63
4.36
5.99
<0.0005
<0.0005
<0.0005
<5
0.62
<0.05
MW-07D
Transition Zone
11/06/2018
<0.1
716
<0.2
0.28 j
0.61
<0.05
<0.5
NA
1390
<0.1
<0.3
<10
1.32
3.92
5.24
NA
<0.0005
NA
<5
0.98
<0.05
MW-07S
Saprolite
02/06/2018
<0.5 D3
4220
<0.2
<0.5
3.3
<0.05
11.6
NA
417
<0.5 D3,B
<0.3
22.1
0.805
1.87 B
2.675
<0.0005
<0.0005
NA
<5
0.47
<0.05
MW-07S
Saprolite
05/11/2018
0.42
4260
<0.2
<0.5
1.2 Sl
<0.05
2
NA
400
0.35
0.099 j,S1
21.9
0.617 U
0.665
1.28
0.00019 j
0.00019 j
0.00018 j
<5
0.55
<0.05
MW-07S
Saprolite
08/09/2018
0.54
3990
<0.2
<0.5
1.4 SI
<0.05
2.3
NA
357
0.46
<0.3
19.2
0.303 U
0.671 U
0.974 U
0.0002 j
0.0002 j
0.00018 j
<5
0.4
<0.05
MW-07S
Saprolite
11/06/2018
0.42
4070
<0.2
<0.5
3
<0.05
0.98
NA
367
0.54
<0.3
19.8
0.653
1.83
2.48
NA
0.00022 j
NA
<5
0.56
<0.05
MW-08D
Bedrock
02/06/2018
<0.1
108
<0.2
<0.5
<0.5
<0.05
<0.5
NA
1560
<0.1
<0.3
<10
1.17
1.58 B
2.75
<0.0005
<0.0005
NA
<5
0.56
<0.05
MW-08D
Bedrock
05/11/2018
<0.1
110
<0.2
0.16j
0.29 j,S1
<0.05
<0.5
NA
1590
<0.1
0.11 j,S1
<10
0.672
1.3
1.97
0.00041j
0.00041j
0.00043j
<5
0.68
<0.05
MW-08D
Bedrock
08/07/2018
<0.1
110
<0.2
0.15j
0.35j
<0.05
<0.5
NA
1500
<0.1
0.071j
I <10
0.281 U
0.44 U
0.721 U
0.00039j
0.00039j
0.00039j
<5
0.67
<0.05
MW-08D
Bedrock
11/06/2018
<0.1
104
<0.2
0.67
<0.5
<0.05
<0.5
NA
1530
<0.1
0.18 j
<10
0.373 U
1.23 U
1.6 U
NA
0.00037 j
NA
<5
0.65
0.0283
MW-08S
Saprolite
02/06/2018
<0.1
1600
<0.2
0.63
1
<0.05
39.1
NA
1530
<0.1
0.3
<10
0.107
0.769 B,D6
0.876
0.0061
0.0061
NA
<5
0.27
<0.05
MW-08S
Saprolite
05/11/2018
<0.1
2270
<0.2
2
1.3 S1
<0.05
2
NA
1560
<0.1
0.36 S1
7.1 j
0.269 U
1.2
1.47 U
0.0049
0.0049
0.0046
<5
0.34
<0.05
MW-08S
Saprolite
08/07/2018
<0.1
3560
<0.2
2.5
1.5
<0.05
0.43 j
NA
1690
<0.1
0.14 j
2.7 j,B
0.0588 U
0.516 U
0.575 U
0.0028
0.0028
0.0025
<5
0.32
<0.05
MW-08S
Saprolite
11/06/2018
<0.1
1350
<0.2
3.8
1.5
<0.05
<0.5
NA
1500
<0.1
0.26 j
<10
0.461
1.26
1.72
NA
0.0057
NA
<5
0.41
<0.05
MW-09D
Transition Zone
02/06/2018
<0.1
944
<0.2
<0.5
4.9
<0.05
<0.5
NA
1060
<0.1
0.57
<10
0.272
0.715
0.987
<0.0005
<0.0005
NA
<5
<0.1
<0.05
MW-09D
Transition Zone
05/11/2018
0.069 j
901
<0.2
0.13 j
5
<0.05
<0.5
NA
1140
<0.1
0.64 Sl
6.4 j
1
0.346 U
1.35 U
0.00014 j
0.00014 j
0.0001 j
<5
0.068 j
0.035 j
MW-09D
Transition Zone
08/07/2018
0.066 j
917
<0.2
0.14 j
4.6
<0.05
<0.5
NA
1030
<0.1
0.44
5.1 j
0.422 U
0.215 U
0.637
0.00012 j
0.00012 j
0.00012 j
<5
0.067 j
0.029 j
MW-09D
Transition Zone
11/06/2018
<0.1
905
<0.2
0.15 j
5.2
0.041 j
<0.5
NA
1050
<0.1
0.53
9.3 j
0.384 U
0.519 U
0.903 U
NA
0.00011 j
NA
<5
0.09 j
0.044 j
MW-09S
Saprolite
02/06/2018
<0.1
<5
<0.2
<0.5
<0.5
<0.05
<0.5
NA
971
<0.1 B
1.9
<10
0
0.452
0.452
<0.0005
<0.0005
NA
<5
<0.1
<0.05
MW-09S
Saprolite
05/11/2018
<0.1
<5
<0.2
0.18 j
0.18 j,S1
<0.05
0.38 j
NA
999
<0.1
1.8
2.6 j
0.182 U
0.499 U
0.681 U
0.00044 j
0.00044 j
0.00041 j
<5
0.12
0.025 j
MW-09S
Saprolite
08/07/2018
0.059 j
9.5
<0.2
0.22 j
0.22 j
<0.05
0.49 j
NA
985
<0.1
1.7
6.3 j
0.121 U
0.299 U
0.42 U
0.00043 j
0.00043 j
0.00039 j
<5
0.11
<0.05
MW-09S
Saprolite
11/06/2018
<0.1
<5
<0.2
0.25 j
0.75
0.041 j
<0.5
NA
99.8
<0.1
4.2
7.5 j
0.458 U
0.463 U
0.921 U
NA
0.00039 j
NA
<5
0.12
0.042 j
MW-10D
Transition Zone
02/09/2018
<0.1
<5
<0.2
<0.5
<0.5
0.13
<0.5
NA
95.1
<0.1
2.9
<10
0
-0.128
-0.128
<0.0005
<0.0005
NA
<5
<0.1
0.13
MW-101)
Transition Zone
05/11/2018
<0.1
<5
<0.2
0.38 j
0.29 j,S1
0.11
0.43 j
NA
94.6
<0.1
2.9
2.8 j
0.277 U
0.211 U
0.488 U
<0.0005
<0.0005
<0.0005
<5
0.086 j
0.12
MW-SOD
Transition Zone
08/10/2018
<0.1
<5
<0.2
0.35 j
0.47 j
0.12
0.41 j
NA
84.4
<0.1
2.9
4.1 j,B
0.233 U
0.66 U
0.893 U
<0.0005
<0.0005
<0.0005
<5
0.085 j
0.11
MW-lOD
Transition Zone
11/07/2018
<0.1
<5
<0.2
0.31 j
<0.5
0.13
0.37 j
NA
88.4
<0.1
2.8
4.6 j,S1
0.161 U
0.355 U
0.516 U
NA
<0.0005
NA
<5
0.081 j
0.13
MW-SOS
Saprolite
02/09/2018
<0.1
6.5
<0.2
1 <0.5
1.3 SI
<0.05
<0.5
NA
<5
<0.1
<0.3
17.2
0.362
0.493
0.855
<0.0005
<0.0005
NA
<5
<0.1
<0.05
MW-10S
Saprolite
05/11/2018
0.04 j
7.9
<0.2
<0.5
1.9 S3
<0.05
<0.5
NA
3.8 j
<0.1
<0.3
8.2 j
0.235 U
1.22
1.46
<0.0005
<0.0005
<0.0005
<5
<0.1
<0.05
MW-SOS
Saprolite
08/10/2018
<0.1
5.8
<0.2
<0.5
1.1
<0.05
<0.5
NA
4 j
<0.1
<0.3
6 j,B
-0.145 U
0.616 U,Sl
0.616 U
<0.0005
<0.0005
<0.0005
<5
<0.1
<0.05
MW-10S
Saprolite
11/07/2018
<0.1
6.5
<0.2
<0.5
1.6
<0.05
<0.5
NA
4.2 j
<0.1
0.15 j,B,Sl
15.1 Sl
0.355 U
-0.305 U
0.355 U
NA
<0.0005
NA
<5
<0.1
<0.05
Page 30 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
FIELD PARAMETERS
WATER QUALITY PARAMETERS
SELECTED 40CFR257 APPENDIX III CONSTITUENTS plus Sr
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
PH
Water
Level
Temp
Spec
Cond
DO
ORP
Eh
Turbidity
Alkalinity
Bi-
carbonate
Alkalinity
Sulfide
Total
Organic
Carbon
Total
Suspended
Solids
Boron
Calcium
Chloride
Strontium
Sulfate
Total
Dissolved
Solids
Aluminum
Antimony
Arsenic
Barium
Beryllium
Cadmium
Chromium
(VI)
Chromium
Cobalt
Reporting Units
S.U.
ft
Deg C
Nmhos/cm
mg/L
mV
mV
NTUs
mg/L
mg/L
mg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
mg/L
mg/L
pg/L
pg/L
pg/L
Ng/L
pg/L
Ng/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
6.5-8.5
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
700
NE
250
NE
250
Soo
NE
1*
10
700
4*
2
10
10
1*
Background Threshold Values (Shallow Unit)
4.6-6.4
NE
NE
NE
NE
NE
NE
NE
63
63
0.1
1
NE
50
10.7
5.5
303
4.2
140
757
0.5
0.4
310
0.2
0.08
5.7
16.5
1.2
Background Threshold Values (Deep Unit)
5.7-6.9
NE
NE
NE
NE
NE
NE
NE
204
204
0.1
1
NE
50
13.1
4.7
665
17.7
183
128
0.5
0.6
127
0.1
0.08
3
7.6
1.9
Background Threshold Values (Bedrock Unit)
5.6-7.6
NE
NE
NE
NE
NE
NE
NE
108
108
1 0.1
1
NE
50
15
1 4.5
253
1 18.4
1 216
300
0.5
1 0.6
1 435
1 0.2
0.08
3.9
1 8.3
2.8
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
MW-11D
Transition Zone
02/07/2018
6.7
45.18
9
51
6.20
84
289
1.4
20.9
20.9
<0.1
<1
<2.5
<50
2.77
1.8
87.3
<1
72
<100
<0.5
0.15
57.5
<0.1
<0.08
8.8
9.3
<0.1
MW-11D
Transition Zone
05/10/2018
6.8
44.76
23
52
5.00
74
279
0.0
21.3
21.3
<0.1
<1
<2.5
<50
3.01
1.8
97.2
<1
65
<100
<0.5
0.12 SI
60
<0.1
<0.08
10.6
8.3
<0.1
MW-11D
Transition Zone
08/09/2018
6.7
44.25
22
53
4.90
98
303
1.5
20.8
20.8
<0.1
<1
<2.5
<50
2.98
2
87.2
0.52 j
66
<100
<0.5
0.28 B,S1
52.1
<0.1
<0.08
8.2
8.7
<0.1
MW-11D
Transition Zone
11/12/2018
6.9
44.32
15
52
5.60
20
225
1.2
22.4
22.4
<0.1
<1
<2.5
<50
3.24
2
96
<1
68
<100
<0.5
0.24
59.6
<0.1
<0.08
5.8
8.6
0.011 j
MW-11S
Saprolite
02/07/2018
5.9
45.57
9
61
6.10
66
271
0.0
25.8
25.8
<0.1
<1
<2.5
<50
2.87
2.6
78.5
<1
52
124
<0.5
0.12
60.7
<0.1
<0.08
5.2
5.8
<0.1
MW-11S
Saprolite
05/10/2018
6.0
45.20
22
64
4.20
42
247
0.0
25
25
<0.1
<1
<2.5
<50
3.16
2.6
80.3
<1
46
59.5 j
<0.5
0.12 SI
56.4
<0.1
<0.08
6.6
5.3
<0.1
MW-11S
Saprolite
08/09/2018
6.0
44.56
21
68
5.90
113
318
1.4
27.2
27.2
<0.1
<1
<2.5
<50
3.39
2.9
82.6
<1
57
<100
<0.5
0.17 B,S1
58.8
<0.1
<0.08
5.8
5.7
<0.1
MW-11S
Saprolite
11/12/2018
5.6
44.60
13
69
5.20
72
277
0.7
30.4
30.4
<0.1
<1
<2.5
<50
3.84
2.9
89.9
<1
48
<100
<0.5
0.14
69.4
0.013 j
<0.08
5.3
6.2
0.01 j
MW-12D
Transition Zone
02/09/2018
6.3
16.22
15
55
4.60
140
345
1.1
21.1
21.1
<0.1
<1
<2.5
<50
2.77
<1
167
4
74
<100
<0.5
0.12
17.3
<0.1
<0.08
0.44
0.76 SI
0.16
MW-12D
Transition Zone
05/14/2018
6.3
12.65
23
58
4.10
108
313
0.6
20.6
20.6
<0.1
<1
<2.7
<50
3.18
0.89 j
158
4.3
61
<100
<0.5
0.11
16.3
<0.1
<0.08
0.58
0.56 SI
0.13
MW-12D
Transition Zone
08/13/2018
6.4
13.94
19
62
4.40
23
228
9.3
21.2
21.2
<0.1
<1
<2.5
54.9 SI
3.16
0.95 j
167
4.2
71
SOS
<0.5
0.13
18.1
<0.1
<0.08
0.46
0.74 SI
0.12
MW-12D
Transition Zone
11/08/2018
6.3
12.78
18
59
4.00
7
212
3.9
23.6
23.6
<0.1
0.69 j
9.7
<50
2.98
1
165
4.2
70
75.3 j
<0.5
0.16
16.7
<0.1
<0.08
<0.12
0.56 B,S1
0.87
MW-12S
Saprolite
02/09/2018
5.9
15.64
15
28
5.30
48
253
0.0
8.9
8.9
<0.1
<1
<2.5
<50
0.752
<1
52.5
<1
38
<100
<0.5
<0.1
53.1
<0.1
<0.08
0.69 M1
0.99 SS
<0.1
MW-12S
Saprolite
05/14/2018
4.8
10.72
20
20
6.40
-73
132
3.4
2.9 j
2.9 j
<0.1
<1
<2.5
<50
0.317
1.6
19.4 S3
0.55 j
<25
<100
<0.5
0.048 j
46.4
0.066 j
<0.08
0.18 P4, RO
0.43 j,S1
3.6
MW-12S
Saprolite
08/13/2018
5.8
13.43
19
27
6.20
8
213
6.8
7.2
7.2
<0.1
<1
9.2
27.1 j
0.622
1.1
38.5
0.76 j
39
105
<0.5
<0.1
53.3
<0.1
<0.08
0.66
0.8 S1
0.22
MW-12S
Saprolite
11/08/2018
5.3
11.41
17
28
5.20
132
337
8.3
5.5
5.5
<0.1
<1
9
<50
0.371
2.1
22.4
1.3
26
144
<0.5
0.081 j
39.9
0.061 j
<0.08
0.5
0.6 B,S1
11.1
MW-13D
Transition Zone
02/12/2018
6.5
3.43
14
94
6.30
144
349
0.5
35.6
35.6
<0.1
<1
<2.5
<50
7.37
4.3
67.4
<1
74
<100
<0.5
<0.1
50.6
<0.1
<0.08
0.92
2.4 SI
<0.1
MW-13D
Transition Zone
05/14/2018
6.4
3.06
18
95
4.90
102
307
0.8
32.8
32.8
<0.1
<1
<2.7
<50
7.33
4.3
68 S3
0.51 j
87
<100
<0.5
0.077 j
46.6
<0.1
<0.08
1.3
1.2 SI
<0.1
MW-13D
Transition Zone
08/09/2018
6.4
4.35
17
96
4.70
127
332
1.2
34.2
34.2
<0.1
<1
<2.5
<50
7.18
4.6
66.6
0.53 j
95
<100
<0.5
0.078 j,S1
45.2
<0.1
<0.08
0.89
IA SI
<0.1
MW-13D
Transition Zone
11/08/2018
6.4
2.91
16
95
4.70
97
302
0.9
36.7
36.7
<0.1
<1
<2.5
<50
7.53
4.4
69.2
0.51 j
96
<100
<0.5
0.057 j
49.9
<0.1
<0.08
0.98
1.1 B,S1
<0.1
MW-13S LAMA
Saprolite
02/13/2018
5.9
5.28
13
74
4.60
37
242
9.9
24.3
24.3
<0.1
1.4
<2.5
<50
4.41
3.9
43.5
1.6
136 D6
422
<0.5
0.13
32.7
<0.1
<0.08
0.42
1.2 SI
0.61
MW-13S
Saprolite
05/14/2018
6.2
5.92
18
88
5.90
-80
125
9.3
30.5
30.5
<0.1
<1
<5
<50
6.68
3.9
59.6 S3
<1
84
378 SI
<0.5
0.092 j
39.1
<0.1
<0.08
0.82
0.93 SI
0.052 j
MW-13S
Saprolite
08/09/2018
5.8
5.25
20
73
3.40
121
326
9.0
24.6
24.6
<0.1
2.5
<5
<50
4.39
4
39.6
2.1
84
630
<0.5
0.18 SI
30.6
0.046j
<0.08
0.42
0.88 SI
0.52
MW-13S
Saprolite
11/12/2018
6.5
5.04
14
86
5.40
45
250
9.5
34.5
34.5
<0.1
<1
2.5
<50
6.62
4.4
62.6
0.55 j
71
298
<0.5
0.099 j
38.4
0.027 j
<0.08
0.56
1.8 SI
0.11
MW-14BR
Bedrock
02/08/2018
6.2
36.25
15
282
0.90
97
302
2.5
61.1
61.1
<0.1
<1
<5
137 SI
23
49.8
768
8
201 S1
<100
<0.5
0.16 S1
41.4
<0.1
<0.08
0.26
1 S1
<0.1
MW-14BR
Bedrock
05/10/2018
6.1
35.88
20
310
0.80
-104
101
2.8
56
56
<0.1
<1
<2.5
126
23
57.3
783
8.2
246
<100
<0.5
0.12 S1
41.3
<0.1
<0.08
0.22 S1
0.68 S1
<0.1
MW-14BR
Bedrock
08/10/2018
6.2
36.32
24
259
1.30
-231
-26
9.8
60.4
60.4
<0.1
<1
4.4
78.7
20.2
35.7
660
8.7
207
324
<0.5
0.13
38
<0.1
<0.08
0.25
1.7 S1
0.11
MW-14BR
Bedrock
11/09/2018
6.3
34.98
12
1
2.30
7
212
2.3
63
63
<0.1
<1
<2.5
156
27
62.7
942
8.3
228
<100
<0.5
0.12
44.4
<0.1
<0.08
0.18 S1
1.8
0.055j
MW-14D
Transition Zone
02/08/2018
5.6
38.20
12
591
0.60
197
402
4.4
31
31
<0.1
<1
<2.5
2310
58.8
54.2
2150
171
416
<100
<0.5
<0.1
35.2
0.39
<0.08
0.069 S1
<0.5
1.9
MW-14D
Transition Zone
05/10/2018
5.6
37.82
23
605
0.90
-111
94
0.2
28.1
28.1
<0.1
<1
<2.5
2030
55.7
55.7
1960
157
443
<100
<0.5
0.05 j,S1
33.2
0.38
0.033j
0.07 S1
0. 17 j,S1
2
MW-14D
Transition Zone
08/10/2018
5.5
38.30
19
610
0.50
-246
-41
1.9
31.7
31.7
<0.1
<1
<2.5
2100
59.4
58.6
2110
168
411
<100
<0.5
<0.1
33.5
0.3
0.031 j
0.069
0.22 j,S1
1.8
MW-14D
Transition Zone
11/09/2018
5.6
37.92
13
605
0.40
-243
-38
2.3
33.5
33.5
<0.1
<1
<2.5
2170
61.1
59.8
2270
135
402
<100
<0.5
0.18
38
0.32
<0.08
0.072 SI
0.22j
1.8
MW-14S
Saprolite
02/08/2018
5.4
37.77
15
817
1.90
300
505
9.3
17.3
17.3
<0.1
<1
13.8
2590
80.6
109
2300
213
482
736
<0.5
<0.1
32.1
0.62
0.1
0.61
1.3 S1
4.5
MW-14S
Saprolite
05/10/2018
5.3
37.35
18
816
1.80
146
351
8.2
15.7
15.7
<0.1
<1
4.4
2430
75.3
104
2230
207
602
1550
<0.5
0.1 S1
43.7
0.61
0.14
0.58 M1,111,S1
18.7
5
MW-14S
Saprolite
08/10/2018
5.3
37.75
22
826
2.10
140
345
7.5
17
17
<0.1
0.52j
<2.5
2470
84.4
109
2330
219
557
1180
<0.5
0.062j
32.8
0.61
0.13
0.78 M1
2.1
4.2
MW-14S
Saprolite
11/09/2018
5.4
37.43
15
830
2.10
120
325
7.4
20.3
20.3
<0.1
<1
11.2
2590
86.2
103
2500
221
565
899
<0.5
0.087j
34.3
0.6
0.12
0.68 S1
2.6
4.2
OB-01 (Ash Basin)
Saprolite
02/12/2018
5.5
49.76
18
21
8.10
193
398
9.8
5.8
5.8
<0.1
<1
12.7
<50
0.808
1.7
16.7
<1
31
348
<0.5
0.13
38.1
0.1
<0.08
0.32
2.3 S1
0.64
OB-01 (Ash Basin)
Saprolite
05/15/2018
5.1
48.61
22
22
5.30
-38
167
9.9
6.1
6.1
<0.1
<1
63.5
<50
0.945
1.7
22.1
<1
<25
2220
0.23 j
0.11
46
0.084 j
0.028 j
0.15
3.2 S1
1.1
OB-01 (Ash Basin)
Saprolite
08/13/2018
5.3
48.62
20
21
7.80
212
417
2.6
4.9 j
4.9 j
<0.1
<1
<2.5
25 j
0.725
1.7
18
<1
<25
<100
<0.5
<0.1
40.4
0.045 j
<0.08
<0.025
0.74 S1
0.59
OB-01 (Ash Basin)
Saprolite
11/07/2018
5.5
48.96
16
22
7.50
179
384
5.8
5.1
5.1
<0.1
<1
<2.5
<50
0.827
1.8
17.8
<1
25
132
<0.5
0.043 j,S1
36.9
0.068 j
<0.08
0.8
1.3 S1
0.57
OB-01 (Dry Ash Landfill)
Saprolite
11/09/2018
5.5
45.52
14
940
0.70
150
355
4.8
6.3
6.3
<0.1
<1
5.5
2720
90.5
242 M6
3230
10.5 M1
606
188
<0.5
0.1
1080
0.18
0.22
1.2 S1
12.6
0.69
OB-03
saprolite
02/OS/2018
5.6
46.74
17
47
4.20
131
336
8.7
20.9
20.9
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
I NA
NA
NA
NA
Page 31 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (TOTAL CONCENTRATION)
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
Copper
Iron
Lead
Lithium
Magnesium
Manganese
Mercury
Molybdenum
Nickel
Nitrate
+ Nitrite
Potassium
Selenium
Sodium
Thallium
Vanadium
Zinc
Aluminum
(0.45u)
Antimony
(0.45u)
Arsenic
(0.45u)
Barium
(0.45u)
Beryllium
(0.45u)
Boron
(0.45u)
Cadmium
(0.45u)
Chromium
(0.45u)
Cobalt
(0.45u)
Copper
(0.45u)
Iron
(0.45u)
Reporting Units
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
mg-N/L
mg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
15A NCAC 02L Standard
1000
300
15
NE
NE
5o
1
NE
100
NE
NE
20
NE
0.2*
0.3*
1000
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Shallow Unit)
3.8
744
0.3
NE
1.8
75.3
0.2
0.5
9.9
2.7
5
0.5
9.1
0.1
5.6
19.2
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Deep Unit)
2.8
272
0.1
NE
14.4
141
0.2
3.2
7.5
1.4
7.8
0.5
29.2
0.1
3.8
17
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Background Threshold Values (Bedrock Unit)
4.2
792
0.2
NE
13.2
26.6
0.2
3
7.2
0.4
9.8
0.5
14
1 0.1
16
1 11.9
1 NE
NE
I NE
I NE
NE
I NE
NE
NE
I NE
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
MW-11D
Transition Zone
02/07/2018
<0.5
<50
<0.1
3.6
1.41
<5
<0.2
<0.5
0.54 SI
0.33
<5
<0.5
<5
<0.1
14.1
<10
<100
<0.5
0.22
50.3
<0.1
<50
<0.08
8.7
<0.1
0.52 SI
<50
MW-11D
Transition Zone
05/10/2018
0.34 j,S1
29.1 j,S1
0.028 j
3.4
1.48
<5
<0.2
0.26 j,S1
0.49 j
0.33
<5
<0.5
3.66 j
<0.1
13.2
<10
<100
<0.5
0.14
52.7
<0.1
<50
<0.08
9.1
<0.1
0.38 j,S1
<50
MW-11D
Transition Zone
08/09/2018
0.91
29.1 j
0.04 j
3.5
1.46
<5
<0.2
0.3 j
0.75
0.33
<5
<0.5
3.5 j
<0.1
13.9
2.9 j,B,SI
<100
<0.5
0.25 S1
52.7
<0.1
<50
<0.08
8.6
<0.1
0.8 S1
<50
MW-111)
Transition Zone
11/12/2018
0.89 sl
32.3 j
<0.1
3.3
1.48
<5
<0.2
0.27 j
0.58
0.35
<5
<0.5
3.86 j
<0.1
13.4
3.4 j
<100
<0.5
0.25
55.4
0.011 j
<50
<0.08
7.9
<0.1
0.93 SI
<50
MW-11S
Saprolite
02/07/2018
<0.5
64.6
<0.1
<0.5
1.71
<5
<0.2
<0.5
<0.5
0.62
<5
<0.5
6.29
<0.1
2
<10
<100
<0.5
0.13
50.1
<0.1
<50
<0.08
5.5
<0.1
0.58 SI
<50
MW-11S
Saprolite
05/10/2018
0.12 j,S1
<50
<0.1
0.28 j,S1
1.79
<5
<0.2
0.082 j,S1
0.32 j
0.61
<5
<0.5
6.41
<0.1
1.8
<10
<100
<0.5
0.1
53.8
0.053 j
<50
<0.08
5.5
<0.1
0.62 SI
<50
MW-11S
Saprolite
08/09/2018
0.12 j
27.8 j
<0.1
0.17 j
1.96
<5
<0.2
0.081 j
0.35 j
0.6
<5
<0.5
6.32
<0.1
2
4 j,B,SI
<100
<0.5
0.11 S1
55.2
<0.1
<50
<0.08
5.8
<0.1
1.4 S1
<50
MW-11S
Saprolite
11/12/2018
0.24 j,S1
<50
<0.1
0.23 j,S1
2.08
<5
<0.2
<0.5
0.55
0.6
<5
<0.5
6.97
<0.1
2.4
4.3 j
<100
<0.5
0.14
63.7
0.013 j
<50
<0.08
5.5
0.01 j
0.71 S1
126 S1
MW-12D
Transition Zone
02/09/2018
<0.5
<50
<0.1
3.7
0.774
<5
<0.2
0.66
0.97 SI
<0.02
<5
<0.5
5.65
<0.1
0.54S1
<10
<100
<0.5
0.13
17.2
<0.1
<50
<0.08
0.5 51
0.15
0.51 SI
<50
MW-12D
Transition Zone
05/14/2018
0.45 j,S1
30.1 j
0.028 j,S1
3.551
0.868
<5
<0.2
0.72
0.75 SI
0.012 j,S1
<5
<0.5
6.08
<0.1
0.55 Sl
<10
<100
<0.5
0.14
14.8
<0.1
<50
<0.08
0.46 j,S1
0.12
0.31 j,S1
<50
MW-12D
Transition Zone
08/13/2018
0.39 j,B,SI
195
0.064 j
2.8
0.859
3.4 j
<0.2
0.75
1.2 SI
0.011 j
<5
<0.5
6.01
<0.1
1.1 B,51
2.6 j
<100
<0.5
0.12
16.6
<0.1
<50
<0.08
0.47 j
0.15
0.72 B,S1
<50
MW-12D
Transition Zone
11/08/2018
0.85 51
141 B,BC
0.14
2.8 B
0.788
13.4
<0.2
0.77
0.95
0.031
<5
<0.5
5.77
<0.1
1.1
4.3 j,B
<100
<0.5
0.13
15
<0.1
<50
<0.08
2.6
0.47
1.4 S1
34.1 j
MW-12S
Saprolite
02/09/2018
<0.5
<50
<0.1
<0.5 B
0.359
<5
<0.2
<0.5
0.57 SI
0.029
<5
<0.5
<5
<0.1
<0.3
<10
<100
<0.5
<0.1
51
<0.1
<50
<0.08
1.3 S1
<0.1
0.51 SI
<50
MW-12S
Saprolite
05/14/2018
0.49 j,S1
37.1 j
0.049 j,S1
1.2 SI
0.403
45.7
<0.2
<0.5
2.1 S1
<0.02
<5
<0.5
1.84 j
0.037 j
0.073 j,S1
7.3 j,S1
<100
<0.5
<0.1
44.5
0.072 j
<50
<0.08
0.33 j,S1
3.6
2.7
<50
MW-12S
Saprolite
08/13/2018
0.22 j,B,SI
239
0.061 j
0.2 j,B
0.363
7
<0.2
<0.5
0.83 SI
0.019 j
<5
<0.5
2.91 j
<0.1
0.72 B,S1
3.3 j
<100
<0.5
<0.1
47.2
0.053 j
<50
<0.08
0.79
0.16
1.4
<50
MW-12S
Saprolite
11/08/2018
1.4 S1
232 B,BC
0.16
0.94 j,B
0.31
130
<0.2
<0.5
1.7
<0.02
<5
<0.5
3.37 j
0.048 j
0.64 S1
7.3 j,B
<100
<0.5
<0.1
40.2
0.041 j
<50
<0.08
0.36 j,S1
10.1
0.46 j,S1
<50
MW-13D
Transition Zone
02/12/2018
<0.5
<50
<0.1
2.5
2.25
<5
<0.2
0.68
0.82 SI
1.7
<5
<0.5
7.63
<0.1
4.9
<10
<100
<0.5
<0.1
45.8
<0.1
<50
<0.08
1.3 S1
<0.1
<0.5 B
<50
MW-13D
Transition Zone
05/14/2018
0.84 SI
<50
0.041 j,S1
2.4 S1
2.24
<5
<0.2
0.7
0.29 j,S1
1.7
<5
<0.5
7.74
<0.1
5.2
<10
<100
<0.5
0.077 j
40.9
<0.1
<50
<0.08
1 s1
<0.1
0.15 j,S1
<50
MW-13D
Transition Zone
08/09/2018
<0.5
27.6 j
<0.1
2.5
2.22
<5
<0.2
0.57
<0.5
1.7
<5
<0.5
7.34
<0.1
4.7
2.7 j,S1
<100
<0.5
0.069 j,S1
44.4
<0.1
<50
<0.08
0.97 SI
<0.1
0.46 j,S1
<50
MW-13D
Transition Zone
11/08/2018
0.14 j,S1
<50
<0.1
2 j
2.28
<5
<0.2
0.62
<0.5
1.7
<5
<0.5
7.82
<0.1
4.8
2.6 j,B
<100
<0.5
0.064 j
42.5
<0.1
<50
<0.08
1 51
0.015 j
0.41 j,S1
<50
MW-13S CAMA
Saprolite
02/13/2018
1
573
0.38
1.3
2.07
15.9
<0.2
<0.5
0.55
1.1
<5
<0.5
6.46
<0.1
3.6
<10
<100
<0.5
0.12
32
<0.1
<50
<0.08
0.71
0.52
0.73
<50
MW-135
Saprolite
05/14/2018
0.29 j,S1
528
0.16 SI
1.6 SI
2.08
5.9
<0.2
0.69
0.13 j,S1
1.5
<5
<0.5
7.35
<0.1
4.3
<10
<100
<0.5
0.094 j
32.8
<0.1
<50
<0.08
0.78 SI
<0.1
0.58 SI
<50
MW-13S
Saprolite
08/09/2018
1.8
891
0.38
1.4 B
1.82
13.4
<0.2
0.29 j
0.49 j
0.79
<5
<0.5
6
<0.1
3.1
4.3 j,S1
51.6 j
<0.5
0.14 SI
29.1
<0.1
<50
<0.08
0.6 SI
0.39
2 SI
59.8
MW-135
Saprolite
11/12/2018
0.81 S1
482
0.26
1.6 j,B,SI
2.1
4.4 j
<0.2
0.73
0.74
1.7
<5
<0.5
7.33
<0.1
4.9
<10
<100
<0.5
0.067 j
37
0.012 j
<50
<0.08
0.92
0.029 j
0.78 BC,SI
35.1 j,S1
MW-14BR
Bedrock
02/08/2018
0.84 SI
<50
<0.1
12.6
9.54
<5
<0.2
<0.5
IA SI
0.18
<5
1.1
15.5
<0.1
3.1
<10
<100
<0.5
0.17
40.2
<0.1
135
<0.08
0.6
<0.1
0.69 SI
<50
MW-14BR
Bedrock
05/10/2018
0.51 S1
30.6 j,S1
<0.1
12.9
9.74
<5
<0.2
0.2 j,S1
0.58
0.16
4.19 j
1.1
14.5
<0.1
3.3
<10
<100
<0.5
0.099 j
40.4
<0.1
129
<0.08
0.59
<0.1
1.3 S1
<50
MW-14BR
Bedrock
08/10/2018
1.4 SI
284
0.084 j
11.1
8.12
8.2
<0.2
1
10
0.18
4.19 j
1.3
14.2
<0.1
3.3
9.2 j,B,SI
<100
<0.5
0.1
37.7
<0.1
112
<0.08
0.58
<0.1
1.1 B,S1
<50
MW-14BR
Bedrock
11/09/2018
0.87
<50
<0.1
11.5
11
3.1 j
<0.2
0.33 j
1.7
0.15
4.71 j
0.93
16.4
<0.1
3
3.6 j
<100
<0.5
0.1
45.3
<0.1
170 SI
<0.08
0.39 j,S1
0.034 j
1.2 S1
<50
MW-14D
Transition Zone
02/08/2018
0.86 SI
<50
<0.1
4.8
17.4
37.7
<0.2
<0.5
20.3
0.09
<5
3.3
26.2
<0.1
<0.3
<10
<100
<0.5
<0.1
32.8
0.32
2160
<0.08
<0.5
1.6
0.9 S1
<50
MW-14D
Transition Zone
05/10/2018
0.9 S1
28.8 j,S1
<0.1
4.6
17.3
34.2
<0.2
0.34 j,S1
20.5
0.085
4.66 j
3.1
23.4
<0.1
0.077 S1
3.6 j
<100
<0.5
0.078 j
32.9
0.33
2050
0.05 j
0.29 j,B
1.7
6.2
<50
MW-14D
Transition Zone
08/10/2018
1.1 51
56.9
<0.1
4.7
17
54.1
<0.2
0.32 j
19.5
0.085
4.74 j
3.1
26
<0.1
<0.3
5.7 j,B,SI
<100
<0.5
<0.1
29.9
0.31
1870
<0.08
0.27 j
1.7
1.8 S1
36.4 j,B,2g
MW-14D
Transition Zone
11/09/2018
1
66.2
<0.1
3.7
17.2
50.5
<0.2
0.35 j
19.6
0.09
5.2
2.9
26
<0.1
0.13 j
<10
<100
<0.5
0.13
36.5
0.32
1960
<0.08
0.21 j,S1
1.7
2.2
170
MW-14S
Saprolite
02/08/2018
8.4
671
<0.1
2.4
33.4
31.8
<0.2
<0.5
48.4
0.096
5.49
6.8
22.9
<0.1
0.44 S3
10.6
152
<0.5
<0.1
22.8
0.51
2420
0.099
0.72
4.3
6.9
<50
MW-14S
Saprolite
05/10/2018
9.5
1640
0.18
2.6
32.3
43.6
<0.2
0.72 SI
60.2
0.092
5.23
6.6
20.5
0.055 j
0.33 S1
11.9
184
<0.5
0.1
22.9
0.58
2320
0.13
16.6
4.6
8.9
91.9
MW-14S
Saprolite
08/10/2018
8.8
983
0.12
2.3
34.3
32.4
<0.2
0.38 j
47.2
0.095
5.66
6.9
23.3
0.052 j
0.16 j,S1
15.1 B,S1
148
<0.5
0.055 j
20.5
0.54
2140
0.12
1.9
4.2
8.8
31.1 j,B,2g
MW-14S
Saprolite
11/09/2018
8.7
761
0.25
2 j
34.8
30.7
<0.2
0.56
47
0.094
6.09
7
22.8
0.053 j
2.8
9.3 j
184
<0.5
0.04 j
24.8
0.54
2360
0.12
1
4.1
8.5
<50
OB-01 (Ash Basin)
Saprolite
02/12/2018
0.75 B,51
241 SI
0.21
0.54
0.268
16.4
<0.2
<0.5
1.9 51
0.027
<5
<0.5
<5
<0.1
<0.3
<10
<100
<0.5
<0.1
38.3
<0.1
<50
<0.08
2 SI
0.61
0.6 S1
<50
OB-01 (Ash Basin)
Saprolite
05/15/2018
0.37 j,S1
1440
0.39
0.56
0.273
55.4
<0.2
0.15 j
2.4 S1
0.013 j
<5
<0.5
1.5 j
0.087 j
0.36
7.8 j
<100
0.22 j
0.051 j
31.9
0.085 j
<50
<0.08
0.9
0.89
0.29 j
53.9
OB-01 (Ash Basin)
Saprolite
j 08/13/2018
0.95 B,S1
58.8
0.056 j,B
0.38 j
0.256
14
<0.2
<0.5
0.43 j,S1
<0.02
<5
<0.5
1.44 j
0.062 j
0.31S1
4.1 j,B
<100
<0.5
<0.1
37.3
0.091 jA25000.2j
0.49 j
0.55
1.1 B
<50
OB-01 (Ash Basin)
Saprolite
11/07/2018
0.58 sl
75.8
0.13
0.56 j
0.263
15.9
<0.2
<0.5
0.57
0.01 j
<5
<0.5
1.5 j
0.047 j
0.21 j
5.3 j,B
<100
<0.5
<0.1
32.9
0.068 j
jNA
1.6
0.49
1.4 BC,SI
<50
OB-Ol (Dry Ash Landfill)
Saprolite
11/09/2018
1.2
262
0.32
1.4 j
21
16.3
<0.2
1.6
16.5
0.54
6.34
0.58
24.4
<0.1
1.2
5.1 j
53.6 j
<0.5
0.049 j
1020
0.16
2.4
0.76
0.76 SI
<50
OB-03
Saprolite
02/08/2018
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Page 32 of 33

TABLE 3-3
2018 COMPREHENSIVE GROUNDWATER QUALITY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
INORGANIC PARAMETERS (DISSOLVED CONCENTRATION WITH FILTER SIZE)
RADIONUCLIDES
OTHER PARAMETERS
Lead
(0.45u)
Manganese
(0.45u)
Mercury
(0.45u)
Molybdenum
(0.45u)
Nickel
(0.45u)
Phosphorus
(0.45u)
Selenium
(0.45u)
Silver
(0.45u)
Strontium
(0.45u)
Thallium
(0.45u)
Vanadium
(0.45u)
Zinc
(0.45u)
Radium-226
Radium-228
Total
Radium
Uranium-238
Total
Uranium
Uranium-238
DIS
Carbonate
Alkalinity
Fluoride
Phosphorus
Reporting Units
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pCi/L
pCi/L
pCi/L
ug/mL
ug/mL
ug/mL
mg/L
mg/L
mg/L
15A NCAC 02L Standard
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5A
NE
0.03A
NE
NE
2
NE
Background Threshold Values (Shallow Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
3
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Deep Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
2.8
NE
0.0005
NE
5
NE
NE
Background Threshold Values (Bedrock Unit)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
5.7
NE
0.0005
NE
5
NE
NE
Sample ID
Well Screen
Location
Sample
Collection Date
Analytical Results
MW-11D
Transition Zone
02/07/2018
<0.1
<5
<0.2
<0.5
<0.5
0.079
<0.5
NA
81.4
<0.1
13.7
<10
NA
NA
NA
NA
NA
NA
<5
0.12
0.077
MW-11D
Transition Zone
05/10/2018
0.034 j
<5
<0.2
0.28 j
0.5 sl
0.06
<0.5
NA
88.2
<0.1
13.8
<10
NA
NA
NA
NA
NA
NA
<5
0.14
0.066
MW-11D
Transition Zone
08/09/2018
<0.1
<5
<0.2
0.28 j
0.5 j,S1
0.091
<0.5
NA
83.9
<0.1
14.2
3.3 j
NA
NA
NA
NA
NA
NA
<5
0.15
0.093
MW-11D
Transition Zone
11/12/2018
<0.1
<5
<0.2
0.29 j
0.47 j
0.082
<0.5
NA
88.8
<0.1
12.9
<10
NA
NA
NA
NA
NA
NA
<5
0.16
0.083
MW-11S
Saprolite
02/07/2018
<0.1
<5
<0.2
<0.5
0.66
0.21
<0.5
NA
70.3
<0.1
2.1
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.21
MW-115
Saprolite
05/10/2018
0.053 j
<5
<0.2
0.13 j
0.38 j,S1
0.18
<0.5
NA
75.7
0.035 j
2.2
<10
NA
NA
NA
NA
NA
NA
<5
0.11
0.2
MW-11S
Saprolite
08/09/2018
<0.1
<5
<0.2
0.079 j
0.53 SI
0.21
<0.5
NA
76.2
<0.1
2.1
3.4 j
NA
NA
NA
NA
NA
NA
<5
0.12
0.21
MW-115
Saprolite
11/12/2018
<0.1
<5
<0.2
0.12 j
0.63
0.21
<0.5
NA
81.2
<0.1
1.9
3.5 j
NA
NA
NA
NA
NA
NA
<5
0.14
0.21
MW-12D
Transition Zone
02/09/2018
<0.1
<5
<0.2
0.76
1.1 SS
0.22
<0.5
NA
162
<0.1
0.62
<10
NA
NA
NA
NA
NA
NA
<5
0.11
0.22
MW-12D
Transition Zone
05/14/2018
<0.1
<5
<0.2
0.8
1.1
0.19
<0.5
NA
145
<0.1
0.52
<10
NA
NA
NA
NA
NA
NA
<5
0.11 S3
0.22
MW-12D
Transition Zone
08/13/2018
<0.1
<5
<0.2
0.73
0.69
0.26
0.21 j
NA
154
<0.1
0.4
<10
NA
NA
NA
NA
NA
NA
<5
0.12
0.25
MW-12D
Transition Zone
11/08/2018
0.11
6.3
<0.2
1
2.6
0.22
<0.5
NA
149
<0.1
0.81
2.7 j
NA
NA
NA
NA
NA
NA
<5
0.097 j
0.25
MW-12S
Saprolite
02/09/2018
<0.1
<5
<0.2
<0.5
0.76 SI
0.063
<0.5
NA
49.4
<0.1
0.44
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.065
MW-12S
Saprolite
05/14/2018
<0.1
33.5
<0.2
<0.5
2.4
<0.05
<0.5
NA
19.9
0.037 j
0.075 j
8.9 j
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
MW-12S
Saprolite
08/13/2018
<0.1
3.1 j
<0.2
<0.5
0.44 j
0.072
<0.5
NA
33.4
<0.1
0.26 j
3 j
NA
NA
NA
NA
NA
NA
<5
<0.1
0.073
MW-12S
Saprolite
11/08/2018
<0.1
116
<0.2
<0.5
1.7
<0.05
<0.5
NA
24.1
0.026 j
0.21 j
5.2 j
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
MW-13D
Transition Zone
02/12/2018
<0.1
<5
<0.2
0.64
<0.5
0.11
<0.5
NA
66.5
<0.1
5
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.1
MW-13D
Transition Zone
05/14/2018
<0.1
<5
<0.2
0.64
<0.5
0.088
<0.5
NA
60.8
<0.1
4.9
<10
NA
NA
NA
NA
NA
NA
<5
0.051 j,S1
0.092
MW-13D
Transition Zone
08/09/2018
<0.1
<5
<0.2
0.52
<0.5
0.12
<0.5
NA
64
<0.1
4.5
<10
NA
NA
NA
NA
NA
NA
<5
0.056 j
0.12
MW-13D
Transition Zone
11/08/2018
<0.1
<5
<0.2
0.55
0.56
0.097
<0.5
NA
62.2
<0.1
4.9
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.1
MW-13S CAMA
Saprolite
02/13/2018
<0.1
11.2
<0.2
0.51
<0.5
0.067
<0.5
NA
46.3
<0.1
2.7
<10
NA
NA
NA
NA
NA
NA
<5
<0.1
0.062
MW-13S
Saprolite
05/14/2018
0.1 sl
<5
<0.2
0.76
0.14 j
0.092
<0.5
NA
54.8
<0.1
3.9
<10
NA
NA
NA
NA
NA
NA
<5
0.053 j,S1
0.1
MW-13S
Saprolite
08/09/2018
0.095 j
9.1
<0.2
0.28 j
0.58 SI
0.07
<0.5
NA
38.7
<0.1
1.9
2.6 j
NA
NA
NA
NA
NA
NA
<5
0.056 j
0.079
MW-13S
Saprolite
11/12/2018
<0.1
<5
<0.2
0.76 B
0.54
0.1
<0.5
NA
54.9 S1
<0.1
3.5
<10
NA
NA
NA
NA
NA
NA
<5
0.079 j
0.12
MW-14BR
Bedrock
02/08/2018
<0.1
<5
<0.2
<0.5
0.94
0.056
1.2
NA
748
<0.1
3.2
<10
0.318
1.85
2.168
<0.0005
<0.0005
NA
<5
<0.1
<0.05
MW-14BR
Bedrock
05/10/2018
<0.1
<5
<0.2
0.23j
0.7 S1
<0.05
1.2
NA
783
<0.1
3.5
<10
0.724 U
2.51 SI
3.23
0.000097j
0.000097j
0.000094j
<5
0.11
0.047j
MW-14BR
Bedrock
08/10/2018
<0.1
<5
<0.2
0.28j
1.7
0.043j
1.2
NA
711
<0.1
3
<10
0.386 U
2.66
3.05
0.0001j
0.0001j
<0.0005
<5
0.1
0.054 M1
MW-14BR
Bedrock
11/09/2018
<0.1
<5
<0.2
0.19 j
1.3
0.042 j
0.86
NA
865
<0.1
2.8
2.9 j,S1
0.899 S1
1.86
2.76
NA
0.00012 j
NA
<5
0.094 j
0.047 j,MI
MW-14D
Transition Zone
02/08/2018
<0.1
48.1
<0.2
<0.5
18.3
0.07
3.1
NA
1980
<0.1
<0.3
<10
0.0527
0.427
0.4797
<0.0005
<0.0005
NA
<5
<0.1
0.053
MW-14D
Transition Zone
05/10/2018
<0.1
33.2
<0.2
0.41j
20.1
<0.05
3.3
NA
1930
<0.1
0.36 B
10.1
0.621
0.122 U
0.743 U
0.000035j
0.000035j
<0.0005
<5
0.061j
0.049j
MW-14D
Transition Zone
08/10/2018
<0.1
37.9
<0.2
0.35 j
19.3
0.062
3.2
NA
1890
<0.1
<0.3
4.4 j,B
-0.07 U
0.443 U
0.443 U
<0.0005
<0.0005
<0.0005
<5
<0.1
0.076
MW-14D
Transition Zone
11/09/2018
<0.1
44.7
<0.2
0.31 j
19.4
0.061
2.9
NA
1960
<0.1
0.11 j
23.3 SI
0.527 U
0.0584 U
0.585 U
NA
<0.0005
NA
<5
0.051 j
0.062
MW-14S
Saprolite
02/08/2018
<0.1
26.5
<0.2
<0.5
44.2
<0.05
6.4
NA
2110
<0.1
<0.3
<10
0.68
0.314
0.994
<0.0005
<0.0005
NA
<5
<0.1
<0.05
MW-14S
Saprolite
05/10/2018
0.083j
27.8
<0.2
0.62
61.7
<0.05
6.8
NA
2040
0.059j
0.39 B
9.3j
0.477 U
0.0692 U
0.546 U
0.000049j
0.000049j
0.000039j
<5
0.053j
0.035j
MW-14S
Saprolite
08/10/2018
0.049 j
22.5
<0.2
0.38 j
47.9
0.025 j
7
NA
2020
0.053 j
<0.3
9.6 j,B
0.181 U
1.04
1.22 U
<0.0005
<0.0005
<0.0005
<5
<0.1
0.036 j
MW-145
Saprolite
11/09/2018
<0.1
24.4
<0.2
0.3 j
46.9
0.031 j
6.7
NA
2190
0.034 j
0.11 j
17.4 SI
IA SI
0.154 U
1.25 U
NA
<0.0005
NA
<5
<0.1
0.052
OB-01 (Ash Basin)
Saprolite
02/12/2018
<0.1
14.1
<0.2
<0.5
2 SI
<0.05
<0.5
NA
17.2
<0.1
<0.3
10
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
OB-01 (Ash Basin)
Saprolite
05/15/2018
0.16
36
<0.2
<0.5
1
<0.05
<0.5
NA
17.1
0.083 j
0.24 j
4 j
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
OB-01 (Ash Basin)
Saprolite
08/13/2018
0.041 j
10.5
<0.2
<0.5
0.31 j
<0.05
<0.5
NA
16.2
0.071 j
<0.3
7 j
]4.1
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
OB-01 (Ash Basin)
Saprolite
11/07/2018
<0.1
11.2
<0.2
<0.5
0.94
<0.05
<0.5
NA
16.6
0.058 j
0.15 j,B,Sl
j,S1
NA
NA
NA
NA
NA
NA
<5
<0.1
<0.05
OB-01 (Dry Ash Landfill)
Saprolite
11/09/2018
<0.1
10.8
<0.2
0.76
20.8
0.054
0.55
NA
2860
<0.1
0.54
6.6 j,Sl
NA
NA
NA
NA
NA
NA
<5
<0.1
0.067
OB-03
Saprolite
02/08/2018
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
<5
NA
NA
Page 33 of 33

TABLE 3-4
DATA QUALIFIERS AND ACRONYMS
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
COLOR NOTES
Bold highlighted concentration indicates exceedance of the 15A NCAC 02L .0202 Standard or the IMAC. (Effective date for 15A NCAC 02L .0202
Standard and IMAC is April 1, 2013)
Turbidity of Sample >_ 10 NTUs
Background Threshold Values reflect the values represented in the NCDEQ letter dated 6/15/2018.
ABBREVIATION NOTES
AB - Active Basin
BGS - below ground surface
BOD - Biologic Oxygen Demand
CB - Compliance Boundary
COD - Chemical Oxygen Demand
Deg C - Degrees Celsius
DIS - Dissolved
DMAs - dimethylarsinic acid
DUP - Duplicate
Eh - Redox Potential
ft - Feet
GPM - gallons per minute
IMAC - Interim Maximum Allowable Concentrations. From the 15A NCAC 02L Standard, Appendix 1, April 1, 2013.
MDC - Minimum Detectable Concentration
McSe - Methylseleninic acid
mg/kg - milligrams per kilogram
mg/L - milligrams per liter
mg-N/L - Milligram nitrogen per liter
MMAs - monomethylarsonic acid
mV - millivolts
NA - Not available or Not Applicable
NO - Not detected
NE - Not established
NM - Not measured
NTUs - Nephelometric Turbidity Units
NW - Northwest
pCi/L - picocuries per liter
PSRG - Primary Soil Remediation Goals
RB - Retired Basin
RL - Reporting Limit
S - South
SeCN - selnocynante
SeMe (IV) - Selenomethionine
SPLP - Synthetic Precipitation Leaching Procedure
S.U. - Standard Units
TCLP - Toxicity Characteristic Leaching Procedure
pg/L - micrograms per liter
pg/mL - microgram per milliliter
pmhos/cm - micromhos per centimenter
W - West
Well Locations referenced to NAD83 and elevations referenced to NAVD88
Page 1 of 3

TABLE 3-4
DATA QUALIFIERS AND ACRONYMS
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
LABORATORY FLAGS
< - concentration not detected at or above the adjusted reporting limit.
A - Federal MCL.
* - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013.
** - In the absence of apporved PBTVs the highest reporting limit is used for comparison pursposes.
lc - The Method Blank failed high. All data below client requested RL is acceptable w/narration.
AB - Analyte was detected in the associated instrument blank.
B - Target analyte detected in method blank at or above the reporting limit. Target analyte concentration in sample is less than 1OX the concentration
in the method blank. Analvte concentration in sample could be due to blank contamination.
Bl - Target analyte detected in method blank at or above the reporting limit. Target analyte concentration in sample was greater than 1OX the
concentration in the method blank. Analyte concentration in sample is not affected by blank contamination.
132 - Target analyte was detected in blank(s) at a concentration greater than 1/2 the reporting limit but less than the reporting limit. Analyte
concentration in sample is valid and may be used for compliance purposes.
B3 - Target analyte was detected in Continuing Calibration Blank(s) at a concentration greater than 1/2 the reporting limit but less than the reporting
limit. Analyte concentration in sample is valid and may be used for compliance purposes.
B4 - Target analyte was detected in Continuing Calibration Blank(s) at or above the reporting limit.
B5 - Target analyte was present in blank(s) above the method detection limit but less than the reporting limit. Data is valid for compliance purposes.
B6 - Target analyte was detected in Continuing Calibration Blank(s) at a concentration greater than the reporting limit.
BC - The same analyte was detected in an associated blank at a concentration above 1/2 the reporting limit but below the
laboratory reporting limit.
CC - The continuing calibration for this compound is outside of Pace Analytical acceptance limits. The result may be biased.
CH - The continuing calibration for this compound is outside of Pace Analytical acceptance limits. The results may be biased high.
CL - The continuing calibration for this compound is outside of Pace Analytical acceptance limits. The results may be biased low.
CR - The dissolved metal result was greater than the total metal result for this element. Results were confirmed by reanalysis.
CU - The continuing calibration for this compound is outside of Pace Analytical acceptance limits. Analyte presence below reporting limits in associated
samples. Results unaffected by high bias.
D3 - Sample was diluted due to the presence of high levels of non -target analytes or other matrix interference.
D4 - Sample was diluted due to the presence of high levels of target analytes.
D6 - The precision between the sample and sample duplicate exceeded laboratory control limits.
E - Analyte concentration exceeded the calibration range. The reported result is estimated.
F5 - The recovery of the analyte in the CRDL standard (also known as the reporting limit verification) did not meet the acceptance criteria.
H - Sample analyzed past the recommended holding time.
H1 - Analysis conducted outside the EPA method holding time.
H2 - Extraction of preparation conducted outside EPA method holding time.
H3 - Sample was received or analysis requested beyond the recognized method holding time.
H5 - Reanalysis conducted in excess of EPA method holding time. Results confirm original analysis performed in hold time.
H6 - Analysis initiated outside of the 15 minute EPA required holding time.
HS - Results are from sample aliquot taken from VOA vial with headspace (air bubble greater than 6 mm diameter).
j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
j- - Estimated concentration, biased low.
j+ - Estimated concentration, biased high.
Ll - Analyte recovery in the laboratory control sample (LCS) was above quality control (QC) limits. Results may be biased high.
L2 - Analyte recovery in the laboratory control sample (LCS) was below QC limits. Results for this analyte in associated samples may be biased low.
L3 - Analyte recovery in the laboratory control sample (LCS) exceeded quality control (QC) limits. Analyte presence below reporting limits in
associated samples. Results unaffected by high bias.
M - Matrix spike / matrix spike dup failure.
M1 - Matrix spike recovery was high: the associated Laboratory Control Spike (LCS) was acceptable.
M2 - Matrix spike recovery was Low: the associated Laboratory Control Spike (LCS) was acceptable.
M4 - The spike recovery value was unusable since the analyte concentration in the sample was disproportionate to the spike level.
M6 - Matrix spike and Matrix spike duplicate recovery not evaluated against control limits due to sample dilution.
N2 - The lab does not hold accreditation for this parameter.
P2 - Re -extraction or re -analysis could not be performed due to insufficient sample amount.
P4 - Sample field preservation does not meet EPA or method recommendations for this analysis.
P8 - Analyte was detected in the method blank. All associated samples had concentrations of at least ten times greater than the blank or were below
the reporting limit.
RO - The data are unusable. The sample results are rejected due to serious deficiencies in meeting QC criteria. The analyte may or may not be present
in the sample.
Rl - Relative Percent Difference (RPD) value was outside control limits.
S - Associated calibration check did not meet specified criteria.
Page 2 of 3

TABLE 3-4
DATA QUALIFIERS AND ACRONYMS
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
LABORATORY FLAGS (CONTINUED)
51 - Data review findings indicate result may be unreliable. Use with caution.
TP - The samples were received outside of required temperature range. Analysis was completed upon client approval.
U - Analyte was analyzed for, but not detected above the MDC.
Page 3 of 3

TABLE 3-5
GEOMETRIC MEAN OF COIs - 2018 QUARTERLY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
SELECTED
CONSTITUENTS
OF INTEREST (COIs)
Boron
Chloride
Strontium
Sulfate
Total
Dissolved
Solids
Barium
Beryllium
Cobalt
Iron
Manganese
Molybdenum
Selenium
Thallium
Total
Radium
Reporting Units
pg/L
mg/L
pg/L
mg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pCi/L
15A NCAC 02L Standard
700
250
NE
250
Soo
700
Z*
1*
JQQ
M
NE
20
0.2*
S^
Background Threshold Values (Shallow Unit)
50
5.5
303
4.2
140
310
0.2
1_2
744
75.3
0.5
0.5
0.1
3
Background Threshold Values (Deep Unit)
50
4.7
665
17.7
183
127
0.1
1.9
272
141
3.2
0.5
0.1
2.8
Background Threshold Values (Bedrock Unit)
50
4.5
253
18.4
216
435
0.2
2.8
7922
26.6
0.5
0.1
5.7
Sample ID
Location With Respect to Marshall Source Areas and Boundaries
Well Screen Location
Data Reduction Method
Analytical Results
AB-03S
Active Ash Basin, SE of saturated area
Ash Pore Water
Geomean
798
7.1
2032
445
832
25.5
1.9
18.3
4663
754
0.6
5.4
3.6
NA
AB-04S
Active Ash Basin, SE of saturated area
Ash Pore Water
Geomean
221
6.0
522
49
148
80.1
<0.1
0.3
123
138
2.2
5.1
0.6
NA
AB-04SL
Active Ash Basin, SE of saturated area
Ash Pore Water
Geomean
633
8.2
802
33.1
144
92.8
0.109
0.3
116
29.7
42.4
<0.5
<0.1
NA
AB-OSS
Active Ash Basin, SE of saturated area
Ash Pore Water
Geomean/Quarter 4 2018
2247
37
2244
2041
3312
9
60.9
437839
6953
<0.5
1.5
1.4
0.7
AB-06S
Active Ash Basin, E of saturated area
Ash Pore Water
Geomean
657
1.2
1981
101
326
129
0.2
1.6
4995
716
7.4
1.1
0.9
NA
AB-075
Active Ash Basin, E of saturated area
Ash Pore Water
Geomean
15380
2.3
5979
1421
2440
39.7
<0.1
2.1
200
2833
1339
39.6
3
NA
AB-08S
Active Ash Basin, E of saturated area
Ash Pore Water
Geomean
847
2.9
1215
120
291
50.8
<0.1
12.4
16830
996
3.1
0.
00.7
NA
AB -SOS
Active Ash Basin, center/ E side
Ash Pore Water
Geomean
25442
8.0
6868
882
1717
61
<0.1
1.4
6863
1443
3175
<0.5
0.12
NA
AB-IOSL
Active Ash Basin, center/ E side
Ash Pore Water
Geomean
11592
7.3
6129
639
1242
445
<0.1
2.4
310
609
4347
0.9
<0.1
NA
AB-125
Active Ash Basin, center/ E side
Ash Pore Water
Geomean
92133
427
5544
924
7404
257
<0.1
0.2
14955
7733
5.4
1.1
0.11
1.6
AB-12SL
Active Ash Basin, center/ E side
Ash Pore Water
Geomean
3390
161
4241
1.5
679
1040
<0.1
<0.1
28959
2838
116
<0.5
<0.1
2.0
AB-13S
Active Ash Basin, center/ NE side
Ash Pore Water
Geomean/Quarter 4 2018
877
1.3
2967
42.3
410
286
<0.1
4.2
3265
233
48.3
6.3
0.9
NA
AB-14S
Active Ash Basin, NE side in tree line
Ash Pore Water
Geomean
10174
6.6
3260
785
1574
39.7
<0.1
<0.1
39606
9050
4.0
0.7
<0.1
NA
AB-15S
Active Ash Basin, NE side, center of basin
Ash Pore Water
Geomean/Quarter 4 2018
3033
37
4523
61.1
557
486
<0.1
2.5
24224
3158
37.5
<0.5
0.2
NA
AB-15SL
Active Ash Basin, NE side, center of basin
Ash Pore Water
Geomean
1349
3.6
2200
90.4
408
497
<0.1
5.1
16735
2016
19.3
<0.5
<0.1
NA
AB-17S
Active Ash Basin, far NE side, north edge
Ash Pore Water
Geomean
22478
14
2134
508
1162
48.7
0.12
0.9
117537
23555
6.6
<0.5
<0.1
NA
AB-18S
Active Ash Basin, NE side, center of basin
Ash Pore Water
Geomean
1966
5.4
2027
24.3
303
295
<0.1
0.6
6954
769
100
2.4
<0.1
NA
AB-20S
In active ash basin, within PV Structural Fill
Ash Pore Water
Geomean
73824
54
8589
2734
4691
30.6
0.3
326
134
7114
2118
561
30
NA
AB-21S
Active Ash Basin, SE of saturated area
Ash Pore Water
Geomean
3941
501
1173
318
1463
86.7
<0.1
2
340755
12087
1.1
<0.5
<0.1
NA
AL-03S
Dry Ash Landfill (Ph 2)
Ash Pore Water
Geomean
74326
23
18578
2049
4776
33
<0.1
0.3
144
109
41703
61
3.7
NA
AB-01S
Active Ash Basin, SW edge on dam
Shallow
Geomean
3153
133
701
96.3
494
56.4
0.5
10.4
653
2400
0_7
1.3
0_3
1.9
AB-02S
Active Ash Basin, SW edge on dam
Shallow
Geomean
<50
3.1
10.7
2.2
32.9
32.4
<0.1
15.6
1332
846
<0.5
<0.5
0.2
1.1
AB-05131-1
Active Ash Basin, SE of saturated area
Shallow
Quarter 4 2018
<50
3.7
1560
59.6
258
241
<0.1
25.1
1240
2920
<0.5
<0.5
<0.1
0.7
AB-07DU
Active Ash Basin, E of saturated area
Shallow
Quarter 4 2018
<50
2.6
814
7.1
149
156
<0.1
12.9
6230
560
0.6
<0.5
<0.1
0.8
AB-08131-1
Active Ash Basin, E of saturated area
Shallow
Quarter 4 2018
<50
3.8
1030
54.1
197
172
<0.1
5_3
3150
849
0.7
<0.5
<0.1
1.6
AB-09S
Active Ash Basin, on NE edge of sat area
Shallow
Geomean
50.9
1.8
73.1
11.1
79.7
35.1
<0.1
1.5
1077
245
<0.5
<0.5
0.14
NA
AB-11S
Active Ash Basin, E side
Shallow
Geomean
<50
1.9
42.8
<1
34.6
11.8
<0.1
0.6
148
60.7
<0.5
<0.5
<0.1
NA
AB-14DU
Active Ash Basin, NE side in tree line
Shallow
Quarter 4 2018
99.9
1.9
272
14.2
99
114
<0.1
1.1
406
263 1
<0.5
<0.5
<0.1
1.3
AB-16DU
Active Ash Basin, NE side on north edge
Shallow
Quarter 4 2018
<rn
7.8
846
17.9
230
189
1 0.11
12.2
3360
941 j
2_5
<0.5
<0.1
0.6
AB-16S
Active Ash Basin, NE side on north edge
Shallow
Geomean
83.9
2.3
302
21.1
176
106
<0.1
14
60739
1933
0.53
<0.5
<0.1
NA
AL-01S
Active Ash Basin, NE side of saturated area
Shallow
Geomean
4518
216
2353
93.8
548
71.4
5
6_5
328
2025
<0.5
1.9
0_2
2.1
AL-02S
Dry Ash Landfill (Ph 2)
Shallow
Geomean
12420
1.8
5494
1401
2400
43
1
0.3
196
j Zj
0.52
92.6
<0.1
NA
BG-01S
Northeast of Ash Basin
Shallow
Geomean
<50
3.3
113
8.6
87.9
49.6
<0.1
0.2
165
7.8
<0.5
<0.5
<0.1
0.4
BG-02S
Northeast of Ash Basin
Shallow
Geomean
<50
1.7
177
5.8
113
296
<0.1
0.103
493
5.6
<0.5
<0.5
<0.1
1.1
BG-03S
Northeast of Ash Basin
Shallow
Geomean
<50
1.7
129
8.2
121
413
<0.1
0.3
375
6.4
<0.5
<0.5
<0.1
0.9
GWA-015
South of Active Ash Basin, on 5 side of dam
Shallow
Geomean
<50
2.9
33.6
8.5
57.2
48.9
0.7
0.6
214
19.4
<0.5
1.4
<0.1
0.9
GWA-02S
SE of Ash Basin
Shallow
Geomean
<50
1.1
21.3
24.8
62.9
66.7
0.147
0.3
72.4
27.3
<0.5
0.6
0.11
0.4
GWA-035
Background, NE of NE end of Active Ash Basin
Shallow
Geomean
<50
2.1
41.3
<1
66.3
31.9
0.102
<0.1
135
9.1
<0.5
<0.5
<0.1
NA
GWA-045
Background, NE of NE end of Active Ash Basin
Shallow
Geomean
51.6
3.7
40.1
<1
59.9
33
<0.1
<0.1
325
1 10.3
<0.5
<0.5
<0.1
NA
GWA-06S
Background, N of Active Ash Basin
Shallow
Geomean
<50
2.8
1 56.2
<1
52.1
60.8
0.11
<0.1
334
10
<0.5
<0.5
<0.1
0.6
GWA-07S
NW of Active Ash Basin
Shallow
Geomean
<50
3.9
195
11.2
123
232
<0.1
10.9
1272
247
1
<0.5
<0.1
NA
GWA-08S
N of Active Ash Basin, on Island Point Rd
Shallow
Geomean
<50
4.7
193
2.5
74
26
<0.1
0.121
242
7.3
<0.5
0.6
<0.1
NA
GWA-10S
Active Ash Basin, N of saturated area
Shallow
Geomean
93.4
1.6
788
58.2
149
60
0.117
0.141
511
43.4
<0.5
2.2
<0.1
NA
GWA-115
Active Ash Basin, N of saturated area
Shallow
Geomean
2779
5.5
1087
Zu
491
54.5
0.2
0.3
250
18.4
Q,Z
ZLZ
<0.1
0.6
GWA-12S
East of site, on Sherrils Ford Rd
Shallow
Geomean
<50
2.2
10.4
3.9
<25
49
<0.1
0.4
68.9
17.4
<0.5
<0.5
<0.1
0.9
GWA-135
East of site, on Steam Plant Road
Shallow
Geomean
<50
1 1.9
7.5
<1
26.2
1 87.9
<0.1
0.141
128
1 36.4
<0.5
<0.5
<0.1
NA
GWA-14S
East of site, on Sherrils Ford Rd
Shallow
Geomean
<50
1.1
13.1
<1
26.2
35.6
<0.1
0.2
148
34.9
0.8
<0.5
<0.1
NA
Page 1 of 4

TABLE 3-5
GEOMETRIC MEAN OF COIs - 2018 QUARTERLY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
SELECTED
CONSTITUENTS
OF INTEREST (COIs)
Boron
Chloride
Strontium
Sulfate
Total
Dissolved
Solids
Barium
Beryllium
Cobalt
Iron
Manganese
Molybdenum
Selenium
Thallium
Total
Radium
Reporting Units
pg/L
mg/L
pg/L
mg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pCi/L
15A NCAC 02L Standard
QO
250
NE
250
Soo
700
4*
1*
300
SQ
NE
20
0.2*
S^
Background Threshold Values (Shallow Unit)
50
5.5
303
4.2
140
310
0.2
1.2
744
75.3
9--5
0.5
0.1
3
Background Threshold Values (Deep Unit)
50
4.7
665
17.7
183
127
0.1
1.9
272
141
3.2
0.5
0.1
2.8
Background Threshold Values (Bedrock Unit)
50
4.5
253
18.4
216
435
0.2
2.8
792
26.6
0.5
0.1
5.7
Sample ID
Location With Respect to Marshall Source Areas and Boundaries
Well Screen Location
Data Reduction Method
Analytical Results
GWA-15S
Active Ash Basin, N of saturated area
Shallow
Geomean
1563
151
1653
84.9
471
149
0.2
1.5
455
684
<0.5
6.5
<0.1
2.1
MS-08
N of FGD Residue Landfill
Shallow
Geomean
<50
1.1
94.1
<1
52.6
39
<0.1
0.2
658
8.5
<0.5
<0.5
<0.1
NA
MS-10
NE of FGD Residue Landfill
Shallow
Geomean
<50
1.1
16.4
<1
27.7
110
0.11
0.5
212
20.5
<0.5
<0.5
<0.1
1.5
MS-11
E of FGD Residue Landfill
Shallow
Geomean
<50
3.8
79.5
1.04
41.9
80.2
<0.1
0.2
396
18.2
<0.5
<0.5
<0.1
NA
MS-13
S of FGD Residue Landfill
Shallow
Quarter 4 2015
1
404
<1
40
99.5
0.21
<0.1
<
14
<0.5
<0.5
<0.1
NA
MW-OS
Dry Ash Landfill (Ph 1)
Shallow
Geomean
198
155
2503
14.4
342
1 379
0.2
0.2
504
43.6
<0.5
1
<0.1
NA
MW-02
N Edge of Active Ash Basin
Shallow
Geomean
3034
4.7
1659
147
297
48.4
0.2
<0.1
<50
14.8
<0.5
28.2
<0.1
NA
MW-03
N Edge of Dry Ash Landfill (Ph 2)
Shallow
Geomean
<50
9.3
58.6
<1
50.8
277
0.6
8.7
325
48.5
<0.5
<0.5
<0.1
NA
MW-04
Near SW corner of Industrial Landfill #1
Shallow
Geomean
<50
1.8
102
<1
52
50.8
<0.1
<0.1
128
<5
<0.5
<0.5
<0.1
1
MW-05
E side of Dry Ash Landfill (Ph 2)
Shallow
Geomean
<50
2.4
134
1.1
58.1
56.4
0.3
0.141
606
16.2
0.6
<0.5
<0.1
NA
MW-06S
SW Corner of Active Ash Basin near dam
Shallow
Geomean
510
22
22.4
23.3
98.9
59.7
0.3
29.3
148
1064
<0.5
0.8
0.12
1.3
MW-07S
SW Corner of Active Ash Basin on dam
Shallow
Geomean
4222
188
1111
92
474
101
1.2
41.2
<50
4294
<0.5
1.7
Q.�
1.7
MW-08S
S of Active Ash Basin on dam
Shallow
Geomean
247
1.7
1801
37.7
552
150
<0.1
0.9
448
2489
1.8
2.3
<0.1
1.1
MW-09S
S of Active Ash Basin on dam
Shallow
Geomean
<50
14
1095
77.4
446
261
<0.1
<0.1
<50
10.1
<0.5
<0.5
<0.1
0.6
MW-10S
SE of Active Ash basin, on bank of Lake Norman
Shallow
Geomean
<50
<1
<5
<1
<25
43.2
<0.1
<0.1
52.4
7.3
<0.5
<0.5
<0.1
0.7
MW-11S
E of Active Ash Basin
Shallow
Geomean
<50
2.7
82.7
<1
50.6
61.1
<0.1
<0.1
<50
<5
<0.5
<0.5
<0.1
NA
MW-12S
E of Active Ash Basin, on Steam Plant Rd
Shallow
Geomean
<50
1.4
30.6
<1
31.3
47.8
<0.1
1
101
21.4
1 <0.5
<0.5
<0.1
NA
MW-135
NE of Ash Basin, near GWA-9BR
Shallow
Geomean
<50
4.0
50.4
1.2
90.9
35
<0.1
0.2
600
8.6
0.52
<0.5
<0.1
NA
MW-14S
N of Satruated area of Active Ash Basin
Shallow
Geomean
2519
106
2338
215
550
35.4
0.6
4.5
953
34.3
0.53
6.8
<0.1
1
OB-01 (Ash Basin)
E of Active Ash Basin
Shallow
Geomean
<50
1.7
18.5
<1
26.4
40.2
<0.1
0.7
198
21.2
<0.5
<0.5
<0.1
NA
OB-01 (Dry Ash Landfill)
In Dry Ash Landfill (Ph 1)
Shallow
Quarter 4 2018
2720
242
3230
10.5
606
1080
0.2
0.7
262
16.3
0.6
<0.1
NA
OB-03
N Edge of Dry Ash Landfill (Ph 2)
Shallow
Quarter 4 2018
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
AB-0113
Active Ash Basin, SW edge on dam
Deep
Geomean
1169
225
2667
37.7
550
441
<0.1
18.1
510
19.8
<0.5
<0.5
<0.1
2.0
AB-02D
Active Ash Basin, SW edge on dam
Deep
Geomean
431
5.1
699
171
378
30.3
<0.1
0.5
256
40.8
<0.5
<0.5
<0.1
3.3
AB-04D
Active Ash Basin, SE of saturated area
Deep
Geomean
359
8.4
238
33.7
134
71.7
<0.1
0.3
1157
51.1
<0.5
<0.5
<0.1
NA
AB-05D
Active Ash Basin, SE of saturated area
Deep
Geomean
<50
2.6
3015
132
355
95.6
<0.1
6.2
725
lu
<0.5
<0.5
<0.1
1.3
AB-07D
Active Ash Basin, E of saturated area
Deep
Geomean
<50
2.2
466
<1
113
141
<0.1
0.2
100
20.4
<0.5
<0.5
<0.1
NA
AB-14D
Active Ash Basin, NE side in tree line
Deep
Geomean
420
1.8
525
53.3
144
178
<0.1
<0.1
51.7
6
0.6
0.6
<0.1
NA
AB-18131-1
Active Ash Basin, NE side, center of basin
Deep
Quarter 4 2018
<50
1.6
133
<1
06 125
92.9
<0.1
3_8
16100
<0.5
<0.1
1
AB-21D
Active Ash Basin, SE of saturated area
Deep
Geomean
<50
12
462
13.5
168
177
<0.1
0.5
1159
74.7
1.3
<0.5
<0.1
NA
AL-01D
Active Ash Basin, NE side of saturated area
Deep
Geomean
3070
268
5774
14.6
610
911
<0.1
0.3
112
24
0.9
<0.5
<0.1
10.4
AL-02D
Dry Ash Landfill (Ph 2)
Deep
Geomean
11056
2.4
1455
860
1528
48.1
<0.1
J ¢
4O6
467
1.6
100
<0.1
NA
AL-03D
Dry Ash Landfill (Ph 2)
Deep
Geomean
5138
2.9
2768
427
803
71.2
<0.1
0.5
388
48.4
1.2
50.9
<0.1
NA
AL-04D
Dry Ash Landfill (Ph 2)
Deep
Geomean
13909
2.9
3525
545
542
101
<0.1
0.7
M
72.4
2
7.8
<0.1
NA
BG-01D
Northeast of Ash Basin
Deep
Geomean
<50
3.0
689
9
137
130
<0.1
0.3
64.3
11.6
<0.5
2.4
<0.1
2.1
GWA-01D
South of Active Ash Basin, on S side of dam
Deep
Geomean
<50
2.3
898
211
437
51.3
<0.1
0.4
256
51
10.9
<0.5
<0.1
2.1
GWA-02DA
SE of Ash Basin
Deep
Geomean
<50
2.3
700
17.4
256
69.4
<0.1
<0.1
65.8
5.8
<0.1
NA
GWA-03D
Background, NE of NE end of Active Ash Basin
Deep
Geomean
<50
2.0
66.8
2.2
96.7
30.3
<0.1
<0.1
56.1
9.2
2.4
<0.5
<0.1
NA
GWA-04D
Background, NE of NE end of Active Ash Basin
Deep
Geomean
<50
3.2
141
8
180
27.9
<0.1
<0.1
50.9
64.8
4_3
<0.5
<0.1
NA
GWA-0513
Background, N of Active Ash Basin
Deep
Geomean
<50
1.5
84.7
2.5
66.2
17.4
<0.1
<0.1
<50
<5
<0.5
<0.5
<0.1
NA
GWA-07D
NW of Active Ash Basin
Deep
Geomean
<50
2.6
187
8.9
135
353
<0.1
0.2
143
5.8
0.6
<0.5
<0.1
NA
GWA-SOD
Active Ash Basin, N of saturated area
Deep
Geomean
<50
1.3
1713
218
422
64.4
0.102
0.3
787
15.2
0.8
<0.5
<0.1
NA
GWA-11D
Active Ash Basin, N of saturated area
Deep
Geomean
1068
5.0
1652
110
274
105
<0.1
0.2
165
87.8
<0.5
10.2
<0.1
1.4
GWA-13DA
East of site, on Steam Plant Road
Deep
Geomean
<50
2.2
107
2.9
136
13.8
<0.1
<0.1
81.3
<5
2
<0.5
<0.1
NA
GWA-14D
East of site, on Sherrils Ford Rd
Deep
Geomean
<50
1.5
66.9
1.4
96.5
23.7
<0.1
0.131
146
17.4
0.9
<0.5
<0.1
NA
GWA-15D
Active Ash Basin, N of saturated area
Deep
Quarter 4 2018
<50
32
1040
117
344
83.2
<0.1
1.1
0.5
<0.1
5.05
MW-06D
SW Corner of Active Ash Basin near dam
Deep
Geomean
169
140
1761
5.4
369
354
<0.1
0.2
1S0
S.7
<0.5
<0.5
<0.1
2.8
Page 2 of 4

TABLE 3-5
GEOMETRIC MEAN OF COIs - 2018 QUARTERLY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
SELECTED
CONSTITUENTS
OF INTEREST (COIs)
Boron
Chloride
Strontium
Sulfate
Total
Dissolved
Solids
Barium
Beryllium
Cobalt
Iron
Manganese
Molybdenum
Selenium
Thallium
Total
Radium
Reporting Units
pg/L
mg/L
pg/L
mg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pCi/L
15A NCAC 02L Standard
QO
250
NE
250
5M
7700
4*
1*
300
SQ
NE
20
0.2*
S^
Background Threshold Values (Shallow Unit)
50
5.5
303
4.2
140
310
0.2
1_2
744
75.3
9--5
0.5
0.1
3
Background Threshold Values (Deep Unit)
50
4.7
665
17.7
183
127
0.1
1.9
272
141
3.2
0.5
0.1
2.8
Background Threshold Values (Bedrock Unit)
50
4.5
253
18.4
216
435
0.2
2.8
792
26.6
0.5
0.1
5_7
Sample ID
Location With Respect to Marshall Source Areas and Boundaries
Well Screen Location
Data Reduction Method
Analytical Results
MW-07D
SW Corner of Active Ash Basin on dam
Deep
Geomean
374
109
1482
72.5
456
82
<0.1
<0.1
979
735
<0.5
<0.5
<0.1
5_3
MW-09D
S of Active Ash Basin on dam
Deep
Geomean
473
6.4
1182
171
343
86.3
<0.1
1.4
53.2
966
<0.5
<0.5
<0.1
0.9
MW-10D
SE of Active Ash basin, on bank of Lake Norman
Deep
Geomean/Quarter 4 2018
<50
1.3
96.1
3.6
70.1
17.8
<0.1
<0.1
<50
<5
<0.5
<0.5
<0.1
0.5
MW-IID
E of Active Ash Basin
Deep
Geomean
<50
1.9
91.8
<1
67.7
57.2
<0.1
<0.1
<50
<5
<0.5
<0.5
<0.1
NA
MW-12D
E of Active Ash Basin, on Steam Plant Rd
Deep
Geomean
51.2
<1
164
4.2
68.8
17.1
<0.1
0.2
80.2
5.8
0.7
<0.5
<0.1
NA
MW-13D
NE of Ash Basin, near GWA-9BR
Deep
Geomean
<50
1 4.4
67.8
<1
87.5
48
<0.1
<0.1
<50
<5
0.6
<0.5
<0.1
NA
MW-14D
N of Satruated area of Active Ash Basin
Deep
Geomean
2150
57
2120
157
418
34.9
0.3
1.9
<50
43.3
<0.5
3.1
<0.1
0.6
AB-OIBR
Active Ash Basin, SW edge on dam
Bedrock
Geomean
2558
232
2150
52.6
521
73.9
<0.1
2.3
7411
539
<0.5
<0.5
<0.1
i3.6
AB-01BRL
Active Ash Basin, SW edge on dam
Bedrock
Geomean
2032
278
2018
38
689
279
<0.1
<0.1
7602
923
0.8
<0.5
<0.1
9_8
AB-01BRLL
Active Ash Basin, SW edge on dam
Bedrock
Quarter 4 2018
1790
294
1850
38
718
323
0.13
5360
1880
4.4
AB-03D
Active Ash Basin, SE of saturated area
Bedrock
Geomean
163
4.5
1230
93.5
266
117
<0.1
0.142
132
50.5
<0.5
<0.5
<0.1
NA
AB-05BR
Active Ash Basin, SE of saturated area
Bedrock
Geomean
<50
1.6
3727
262
502
90.1
<0.1
0.8
203
94.5
<0.5
<0.5
<0.1
2.9
AB-06BRA
Active Ash Basin, E of saturated area
Bedrock
Geomean/Quarter 3 2018
548
3.2
1774
83.9
474
78.1
<0.1
<0.1
107
29.5
<0.1
NA
AB-06BRL
Active Ash Basin, E of saturated area
Bedrock
Geomean/Quarter 4 2018
2.6
5879
288
549
31.4
<0.1
<0.1
269
62.2
5.2
<0.5
<0.1
NA
AB-06D
Active Ash Basin, E of saturated area
Bedrock
Geomean
5376
3.5
4132
40.6
324
85.3
0.6
1.8
5551
437
<0.5
<0.5
<0.1
NA
AB-08D
Active Ash Basin, E of saturated area
Bedrock
Geomean
<50
2.4
2247
75.4
276
51.4
<0.1
0.137
87.6
328
2
<0.5
<0.1
NA
AB-09BR
Active Ash Basin, on NE edge of sat area
Bedrock
Geomean
<50
1.3
254
15.8
186
195
<0.1
0.142
716
95
4_7
<0.5
<0.1
NA
AB-09D
Active Ash Basin, on NE edge of sat area
Bedrock
Geomean
<50
1.7
224
8.1
145
253
<0.1
2.4
1014
50.4
2.5
<0.5
<0.1
NA
AB-10BR
Active Ash Basin, center/ E side
Bedrock
Geomean
296
3.1
5051
20.9
387
232
<0.1
0.126
304
30.5
0.8
<0.5
<0.1
NA
AB -SOD
Active Ash Basin, center/ E side
Bedrock
Geomean
1414
5.1
2853
9.2
327
421
<0.1
10.7
4495
4235
1.6
<0.5
<0.1
NA
AB-11D
Active Ash Basin, E side
Bedrock
Geomean
55.8
1.7
1197
3.1
106
17.4
<0.1
<0.1
96.2
5.3
0.7
<0.5
<0.1
NA
AB-12BR
Active Ash Basin, center/ E side
Bedrock
Geomean
58.6
1.4
9494
158
382
32.1
<0.1
<0.1
129
31.2
2.2
<0.5
<0.1
5_8
AB-12D
Active Ash Basin, center/ E side
Bedrock
Geomean
1191
140
10412
172
715
51.4
<0.1
I <0.1
133
118
0.52
<0.5
<0.1
7_3
AB-13D
Active Ash Basin, center/ NE side
Bedrock
Geomean
<50
2
691
13.9
221
218
<0.1
2.1
2-M
226
1.4
<0.5
<0.1
NA
AB-15BR
Active Ash Basin, NE side, center of basin
Bedrock
Geomean
<50
2.1
1064
67.4
281
106
<0.1
<0.1
2404
271
0.9
0.55
<0.1
NA
AB-15D
Active Ash Basin, NE side, center of basin
Bedrock
Geomean
<50
2.6
646
32.8
267
254
<0.1
<0.1
2602
263
0.8
<0.5
<0.1
NA
AB-16D
Active Ash Basin, NE side on north edge
Bedrock
Geomean
<50
3.3
404
24.9
197
182
<0.1
0.2
1342
196
1
<0.5
<0.1
NA
AB-17D
Active Ash Basin, far NE side, north edge
Bedrock
Geomean
<50
1.1
107
<1
89.2
26
<0.1
0.111
<50
<5
<0.5
<0.5
<0.1
NA
AB-18D
Active Ash Basin, NE side, center of basin
Bedrock
Geomean
<50
1.7
185
4.8
98.1
37.2
<0.1
0.103
60.9
74.5
1
<0.5
<0.1
NA
AB-20D
In active ash basin, within PV Structural Fill
Bedrock
Geomean
79.7
1.8
494
18.9
128
54.5
<0.1
<0.1
215
9.5
10.1
<0.5
<0.1
NA
AL-01BR
Active Ash Basin, NE side of saturated area
Bedrock
Geomean
581
168
3257
7.5
463
369
<0.1
<0.1
66.5
11
<0.5
<0.5
<0.1
11
AL-02BR
Dry Ash Landfill (Ph 2)
Bedrock
Geomean
4RM
<1
2935
232
505
143
<0.1
0.8
101
52
5--2
17.8
<0.1
NA
AL-02BRL
Dry Ash Landfill (Ph 2)
Bedrock
Geomean
2060
1.1
1592
202
438
1 107
<0.1
<0.1
<50
12.7
1
5.3
<0.1
0.6
AL-02BRLL
Dry Ash Landfill (Ph 2)
Bedrock
Geomean
10169
4.3
3703
5J2
1015
78.5
<0.1
<0.1
513
727
1.1
1
<0.1
5_8
AL-03BR
Dry Ash Landfill (Ph 2)
Bedrock
Geomean
1165
2.1
1156
178
419
113
<0.1
<0.1
<50
35.4
3_8
6.9
<0.1
NA
AL-04BR
Dry Ash Landfill (Ph 2)
Bedrock
Geomean
9185
1.7
2855
228
471
107
0.109
0.144
113
6
<0.5
6.3
<0.1
NA
AL-04BRL
Dry Ash Landfill (Ph 2)
Bedrock
Geomean/Quarter 4 2018
53.9
2.5
533
5.6
158
148
<0.1
<0.1
306
32.0
1.5
<0.1
NA
BG-01BRA
Northeast of Ash Basin
Bedrock
Geomean
<50
2.4
200
2.1
146
446
<0.1
0.2
134
31.8
0.6
<0.5
<0.1
2.1
BG-02BR
Northeast of Ash Basin
Bedrock
Geomean
<50
2.5
244
3.1
153
473
<0.1
<0.1
<50
1 <5
<0.5
<0.5
<0.1
4.9
BG-03BR
Northeast of Ash Basin
Bedrock
Geomean
<50
2.5
183
10.8
181
66.8
<0.1
0.3
485
10.9
1.8
<0.5
<0.1
1
BG-03D
Northeast of Ash Basin
Bedrock
Geomean
<50
2.6
159
10.8
179
800
<0.1
<0.1
52.5
<5
<0.5
<0.5
<0.1
0.9
GWA-OIBR
South of Active Ash Basin, on S side of dam
Bedrock
Geomean
<50
3.0
270
48.6
155
37
<0.1
0.8
68.8
<5
<0.5
0.52
<0.1
0.9
GWA-06D
Background, N of Active Ash Basin
Bedrock
Geomean
<50
3.2
237
8.7
105
26
<0.1
0.8
88.7
38.8
0.7
<0.5
<0.1
0.4
GWA-08D
N of Active Ash Basin, on Island Point Rd
Bedrock
Geomean
<50
2.7
177
<1
82.5
31.6
<0.1
<0.1
208
12.4
<0.5
<0.5
<0.1
NA
GWA-09BR
NE of Ash Basin, near MW-13 wells
Bedrock
Geomean
<50
4.3
-91.4
<1
95.9
16.3
<0.1
<0.1
<50
<5
<0.5
<0.5
<0.1
NA
GWA-11BR
Active Ash Basin, N of saturated area
Bedrock
Geomean
<50
3.6
568
47.3
200
1 52.3
1 <0.1
<0.1
235
8
1.1
<0.5
1 <0.1
1.1
IL GWA-12BR
East of site, on Sherrils Ford Rd
Bedrock
Geomean
<50
1.5
180
20.9
1 112
1 29.6
1 <0.1
1.3
515
277
2.3
<0.5
I <0.1
1.3
Page 3 of 4

TABLE 3-5
GEOMETRIC MEAN OF COIs - 2018 QUARTERLY DATA
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
SELECTED
CONSTITUENTS
OF INTEREST (COIs)
Boron
Chloride
Strontium
Sulfate
Total
Dissolved
Solids
Barium
Beryllium
Cobalt
Iron
Manganese
Molybdenum
Selenium
Thallium
Total
Radium
Reporting Units
pg/L
mg/L
pg/L
mg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pCi/L
15A NCAC 02L Standard
700
250
NE
250
500
700
4*
1*
300
SQ
NE
20
0.2*
5^
Background Threshold Values (Shallow Unit)
50
5.5
303
4.2
140
310
0.2
1_2
744
75.3
0_5
0.5
0.1
3
Background Threshold Values (Deep Unit)
50
4.7
665
17.7
183
127
0.1
1_9
272
141
3_2
0.5
0.1
2.8
Background Threshold Values (Bedrock Unit)
50
4.5
253
18.4
216
435
0.2
2.8
792
26.6
3
0.5
0.1
5_7
Sample ID
Location With Respect to Marshall Source Areas and Boundaries
Well Screen Location
Data Reduction Method
Analytical Results
GWA-12D
East of site, on Sherrils Ford Rd
Bedrock
Geomean
<50
NA
NA
11
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
MW-04D
Near SW corner of Industrial Landfill #1
Bedrock
Geomean
<50
1.3
191
1.2
79.7
40.3
<0.1
<0.1
68.3
<5
<0.5
<0.5
<0A
0.6
MW-08D
S of Active Ash Basin on dam
Bedrock
Geomean
268
8.2
1744
100
399
14.1
0.108
0.3
854
111
<0.5
<0.5
<0.1
1.6
MW-14BR
N of Satruated area of Active Ash Basin
Bedrock
Geomean
121
50
Z,92
8.3
220
41.2
<0.1
<0.1
68.3
5.02
<0.5
1.1
<0.1
2.8
Notes:
Geometric means were calculated for wells with four or more valid sample results. Sample results were excluded from calculations:
1. if turbidity >10 NTU (for COIs other than boron)
2. if pH >10 S.U. (for molybdenum and selenium only)
3. for unusable data (RO qualified)
4. if a result was non -detect at a reporting limit (RL) greater than the normal laboratory RL
For wells with datasets containing fewer than four valid results, the most recent valid sample data was used. All data are from 2018.
Bold underlined italicized text - Constituent concentration exceeds applicable comparison criteria in wells not screened in ash pore water.
Q - Constituent concentration shown is most recent valid sample available due to insufficient dataset for geomean calculation.
12.49 - Strike -through data is suspect due to elevated pH.
* - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013.
< - concentration not detected at or above the adjusted reporting limit.
< - concentration not detected at or above the adjusted reporting limit.
mg/L - Milligrams per liter
µg/L - Micrograms per liter
NA - Not Analyzed
NE - Not established
Prepared by: HEG Checked by: ECW
Page 4 of 4

TABLE 3-6
CONSTITUENTS OF INTEREST EVALUATION
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Constituent of Interest
2)
2L Criterion
Groundwater Zone
Statistical) Derived
y 1
Maximum 2018
Geomean Concentration
Near or Outside of
Compliance Boundary
(mg/L)
ExcRatio a
Number of Wells
Above Criterion
Compliance Boundary
in Annual Report
Rationale for Exclusion from MappingUpdate
Constituents with 2L Criterion
Arsenic
10 (pg/L)
Shallow: 0.4
3.27
0.33
0
No geomeans exceed comparative criteria.
Transition Zone: 0.6
0.36
0.04
0
No geomeans exceed comparative criteria.
Bedrock: 0.6
0.20
0.02
0
No geomeans exceed comparative criteria.
Barium
700 (pg/L)
Shallow: 310
261.35
0.37
0
No geomeans exceed comparative criteria.
Transition Zone: 127
910.69
1.30
1
No discernable plume.
Bedrock: 435
369.05
0.53
0
No geomeans exceed comparative criteria.
Boron
700 (pg/L)
Shallow: 50
4518.29
6.45
6
Figure 3-12
Transition Zone: 50
3069.86
4.39
4
Figure 3-13
Bedrock: 50
2558.05
3.65
3
Figure 3-14
Cadmium
2 (pg/L)
Shallow: 0.08
0.48
0.24
0
No geomeans exceed comparative criteria.
Transition Zone: 0.08
0.10
0.05
0
No geomeans exceed comparative criteria.
Bedrock: 0.08
<0.08
0.00
0
No geomeans exceed comparative criteria.
Chloride
250 (mg/L)
Shallow: 5.5
215.53
0.86
0
No geomeans exceed comparative criteria.
Transition Zone: 4.7
267.94
1.07
1
No discernable plume.
Bedrock: 4.5
294.00
1.18
2
No discernable plume - impacts >21- confined to AB-1 location.
Chromium (Total)
SO (pg/L)
Shallow: 16.5
15.60
0.95
0
No geomeans exceed comparative criteria.
Transition Zone: 7.6
3.40
0.21
0
No geomeans exceed comparative criteria.
Bedrock: 8.3
4.94
0.49
0
No geomeans exceed comparative criteria.
Iron
300 (pg/L)
Shallow: 744
1331.58
1.79
2
No discernable plume.
Transition Zone: 272
1190.00
3.97
5
Historically high background values, occurrence coincident with boron plume.
Bedrock: 792
7602.17
9.60
3
Historically high background values occurrence coincident with boron plume.
Manganese
50 (pg/L)
Shallow: 75.3
4294.40
57.03
7
Historically high background values, occurrence coincident with boron plume.
Transition Zone: 141
965.97
6.85
3
Historically high background values, occurrence coincident with boron plume.
Bedrock: 26.6
1880.00
37.60
3
Historically high background values occurrence coincident with boron plume.
Selenium
20 (pg/L)
Shallow: 0.5
21.73
1.09
1
No discernable plume.
Transition Zone: 0.5
10.23
0.51
0
No geomeans exceed comparative criteria.
Bedrock: 0.5
1.10
0.05
0
No geomeans exceed comparative criteria.
Sulfate
250 (mg/L)
Shallow: 4.2
262.21
1.05
1
No discernable plume.
Transition Zone: 17.7
1 171.10
1 0.68
0
No geomeans exceed comparative criteria.
Bedrock: 18.4
52.59
0.21
0
No geomeans exceed comparative criteria.
Total Dissolved Solids
500 (mg/L)
Shallow: 140
552.09
1.10
3
Occurrence coincident with boron plume.
Transition Zone: 183
609.96
1.22
2
Occurrence coincident with boron plume.
Bedrock: 216
718.00
1.44
3
Occurrence coincident with boron plume.
Antimony
1 (pg/L)*
Shallow: 0.5
0.61
0.61
0
No geomeans exceed comparative criteria.
Transition Zone: 0.5
<0.50
0.00
0
No geomeans exceed comparative criteria.
Bedrock: 0.5
0.91
0.91
0
No geomeans exceed comparative criteria.
Beryllium
4 (pg/L)*
Shallow: 0.2
5.02
1.25
1
No discernable plume.
Transition Zone: 0.1
0.35
0.09
0
No geomeans exceed comparative criteria.
Bedrock: 0.2
<0.10
0.00
0
No geomeans exceed comparative criteria.
Cobalt
1 (pg/L)*
Shallow: 1.2
41.21
34.34
7
Occurrence generally coincident with boron plume. Anamolous detections do not create a discernable plume.
Transition Zone: 1.9
18.11
9.53
1
Occurrence coincident with boron plume.
Bedrock: 2.8
2.26
0.81
0
No geomeans exceed comparative criteria.
Thallium
0.2 (pg/L)*
Shallow: 0.1
0.44
2.21
3
Occurrence coincident with boron plume.
Transition Zone: 0.1
<0.10
0.00
0
No geomeans exceed comparative criteria.
Bedrock: 0.1
<0.11
0.00
0
No geomeans exceed comparative criteria.
Vanadium
0.3 (pg/L)*
Shallow: 5.6
2.80
0.50
0
No geomeans exceed comparative criteria.
Transition Zone: 3.8
2.85
0.75
0
No geomeans exceed comparative criteria.
Bedrock: 16
4.07
0.25
0
No geomeans exceed comparative criteria.
Nickel
100 (pg/L)
Shallow: 9.9
50.42
0.50
0
No geomeans exceed comparative criteria.
Transition Zone: 7.5
19.97
0.20
0
No geomeans exceed comparative criteria.
Bedrock: 7.2
4.62
0.05
0
No geomeans exceed comparative criteria.
Radium
5 (pCi/L)^
Shallow: 3
2.13
0.43
0
No geomeans exceed comparative criteria.
Transition Zone: 2.8
10.45
2.09
3
Occurrence coincident with boron plume.
Bedrock: 5.7
13.63
2.39
3
Occurrence coincident with boron plume.
Background Criterion
Chromium (Hexavalent)
10
Shallow: 5.7
1.44
0.14
0
No geomeans exceed comparative criteria.
Transition Zone: 3
1.96
0.20
0
No geomeans exceed comparative criteria.
Bedrock: 3.9
2.35
0.24
0
No geomeans exceed comparative criteria.
Molybdenum
NE
Shallow: 0.5
1.76
3.52
4
Occurrence coincident with boron plume.
Transition Zone: 3.2
10.94
3.42
1
No discernable plume.
Bedrock: 3
1.14
0.38
0
No geomeans exceed comparative criteria.
Strontium
NE
Shallow: 303
2353.27
7.77
9
Occurrence coincident with boron plume.
llLansition Zone: 665
5774.27
8.68
12
Occurrence coincident with boron plume.
Bedrock: 253
3256.84
12.87
7
Occurrence coincident with boron plume.
Notes:
1 - Background values shown reflect those accepted by NCDEQ in June 15, 2018 letter. These values are currently being updated for re -approval from NCDEQ in 2019.
2 - Constituent list reflects the COI list identified in the CSA Update (SynTerra, 2018) with radium included per NCDEQ request (per Comments to CSA Update)
3 - The following wells were used to calcuate geomean concentrations at or near the compliance boundary: GWA-10S/D, MW-14S/D/BR/BRL, AL-1S/D/BR/BRL, GWA-15S/13,13
GWA-11S/D/BR, MW-6S/D, AB-1S/D/BR/BRUBRLUBRLLL, MW-10S/D, MW-7S/D, MW-8S/D, MW-9S/D, AB-2S/D/BR, GWA-1S/D/BR.
NE - Not Established
* IMAC
^ Federal MCL
pg/L - micrograms per liter
mg/L - milligrams per liter
Highlighted value reference criterion
**Shallow background values come from transition zone
Prepared by: DAA Checked by: Blow
Page 1 of 1

TABLE 3-7
GROUNDWATER BACKGROUND THRESHOLD VALUES AND
REGIONAL BACKGROUND CONCENTRATION RANGES
2018 CAMA ANNUAL INTERIM MONITORING REPORT
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Constituent
Reporting Unit
15A NCAC 02L Standard
Background
Threshold Valuesl
Constituent Concentration
Ranges in Background Wells
Constituent Concentration Ranges in
Big 6 Piedmont Background Wells
Shallow
Flow Zone
Deep
Flow Zone
Bedrock
Flow Zone
Shallow
Flow Zone
Deep
Flow Zone
Bedrock
Flow Zone
Shallow
Flow Zone
Deep
Flow Zone
Bedrock
Flow Zone
Antimony
lag/L
1*
0.5
0.5
0.5
<0.5 - 0.87
<0.5
<0.5
<0.5 - 1.4
<0.5 - 2.56
<0.5 - 1.4
Arsenic
lag/L
10
0.4
0.6
0.6
<0.1 - 0.62
0.1 - 2.1
<0.1 - 1
<0.1 - 1.1
<0.1 - 2.1
<0.1 - 3.13
Barium
lag/L
700
310
127
435
22.2 - 730
15.1 - 146
23 - 880
9.8 - 730
<5 - 146
<5 - 880
Beryllium
lag/L
4*
0.2
0.1
0.2
<0.1 - 0.61
<0.1
<0.1
<0.1 - 1
<0.1 - 0.26
<0.1 - 0.11
Boron
lag/L
700
50
50
50
<50
<50
<50
<50
<50
<50
Cadmium
lag/L
2
0.08
0.08
0.08
<0.08 - 0.2
<0.08
<0.08
<0.08 - 0.41
<0.08 - 0.2
<0.08 - 1
Chloride
mg/L
250
5.5
4.7
4.5
<1 - 5.4
1.1 - 4.8
0.65 -4
<1 - 18.8
1.1- 190
0.65 - 150
Chromium
lag/L
10
16.5
7.6
8.3
<0.5 - 14.1
<0.5 - 3.1
<0.5 - 11.3
<0.5 -14.1
<0.5 - 19.5
<0.5 - 11.3
Chromium (VI)
lag/L
10
5.7
3
3.9
0.11 - 7.1
<0.025 - 2.7
<0.025 - 8
<0.025 - 7.1
<0.025 - 12.2
<0.025 - 8
Cobalt
lag/L
1*
1.2
1.9
2.8
<0.1 - 1.2
<0.1 - 1.2
<0.1 - 3.3
<0.1 - 17.3
<0.1 - 6.1
<0.1 - 21.7
Iron
lag/L
300
744
272
792
<50 - 913
<50 - 90
<50 - 788
<50 - 6820
<50 - 3200
<50 - 8730
Manganese
lag/L
50
75.3
141
26.6
<5- 160
<5 - 156
<5 - 385
<5 - 780
<5 - 408
<5 - 1510
Molybdenum
lag/L
NE
0.5
3.2
3
<0.5 - 1.4
<0.5 - 10.5
<0.5 - 4
<0.5 - 10.7
<0.5 - 30.2
<0.5 - 24.3
Selenium
lag/L
20
0.5
0.5
0.5
<0.5 - 0.72
<0.5 - 2.9
<0.5 - 0.62
<0.5 - 0.72
<0.5 - 2.9
<0.5 - 2.82
Strontium
lag/L
NE
303
665
253
9 - 223
81.9 - 732
140 - 333
<5 - 309
<5 - 782
<5 - 458
Sulfate
mg/L
250
4.2
17.7
18.4
<1 - 12.8
2.4 - 35.4
<1 - 23.9
<1 - 12.8
<1 - 48.1
<1 - 140
TDS
mg/L
500
140
183
216
<25 - 147
38 - 206
41 - 248
<25 -164
<25 - 750
<25 - 820
Total Radium
pCi/L
5^
3
2.8
5.7
-0.112 - 2.574
0.258 - 3.279
0.361 - 7.43
-0.438 - 2.574
-0.268 - 9.97
-0.164 - 7.43
Vanadium
lag/L
0.3*
5.6
3.8
16
<0.3 - 15.4
0.68 - 4
<0.3 - 26.6
<0.3 - 15.4
<0.3 - 24.4
<0.3 - 26.6
Notes:
Indicates that BTVs were calculated using data from background groundwater samples collected June 2015 to March 2017
* Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013
^ Federal MCL
lag/L - micrograms per liter
BTV - Background Threshold Value
BTVs represent upper tolerance limits (UTLs) calculated from background datasets
COI - Constituent of Interest
CSA - Comprehensive Site Assessment
mg/L - milligrams per liter
NCAC - North Carolina Administrative Code
NE - Not Established
S.U. - Standard Units
TDS - Total Dissolved Solids
Prepared by: HES Checked by: HEG
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