NC0004987_Responce to letter Dated May 16, 2017_20170615

% DUKE
ENERGY,
June 15, 2017
Mr. Jay Zimmerman, P.G. Director
Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Response to letter dated May 16, 2017
Marshall Steam Station
NPDES Permit #: NC0004987
Catawba County
Dear Mr. Zimmerman:
Paul Draovitch
Senior Vice President
Environmental, Health & Safety
526 South Church Street
Charlotte, NC 28202
RECE, ama)EOJMD
3UN 15 2017
Water Quaton
Permlwtn9
Attached please find the documentation requested in accordance with your letter dated May 16,
2017. Your letter asked Duke Energy to submit an Unpermitted Discharge Corrective Action
Plan ("UDCAP") in accordance with N.C.G.S. § 130A -309.212(c). Duke Energy is not aware of
any unpermitted discharges at the subject facility. Outfall 101 and 102 were added to the
NPDES permit effective October 1, 2016 and are permitted along with outfalls 001 and 002. We
are complying with your request because we recognize the importance the Department places on
the proper management of coal ash surface impoundments. Nonetheless, our submission of the
UDCAP should not be construed as a concession that there are unpermitted discharges at
Marshall or that corrective action is required by N.C.G.S. § 130A -309.212(c).
In summary, Duke Energy has chosen to obtain NPDES coverage for previously unpermitted
discharges at Marshall. Duke made application for coverage in a submittal to the DEQ dated
October 9, 2014. The NPDES permit for the subject facility was issued with an effective date of
October 1, 2016. Specific responses addressing other requirements found in § 130A -
309.212(2)b, and § 130A -309.212(2).e can be found in the attached document.
Additionally, as requested in your May 16, 2017 letter, Duke Energy is providing historic maps,
and an additional copy of the Natural Resource Technical Report. This report contains
preliminary evaluation of jurisdictional waters and was prepared for Duke Energy by a third
party consultant.
pSincer ly,'
P aovitc
Senior Vice President
Environmental, Health & Safety

Duke Energy Carolinas, LLC
Unpermitted Discharge
Corrective Action Plan
N.C.G.S § 130A -309.212(c)(2)
Marshall Steam Station
Terrell, NC
Catawba County
NPDES Permit # NC0004987
June 15, 2017

Duke Energy Carolinas, LLC
Unpermitted Discharge
Corrective Action Plan
N.C.G.S § 130A -309.212(c)(2)
Marshall Steam Station
Terrell, NC
Catawba County
NPDES Permit # NC0004987
June 15, 2017
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Unpermitted Discharge Corrective Action Plan June 15, 2017
Marshall Steam Station
TABLE OF CONTENTS
SECTION PAGE
1.0 INTRODUCTION AND PURPOSE..............................................................................1
2.0 SITE BACKGROUND.....................................................................................................2
2.1 Plant Description..........................................................................................................2
2.2 Ash Basin Description..................................................................................................2
2.3 Identification of Unpermitted Discharges.................................................................2
3.0 CORRECTIVE ACTION PLAN.....................................................................................4
3.1 Proposed Corrective Action........................................................................................4
3.2 Detailed Explanation of the Reasons for Selecting the Method of
CorrectiveAction.........................................................................................................4
3.2.1 Option 1 — NPDES Permitting..............................................................................4
3.2.1.1 Seep Description...............................................................................................5
3.2.1.2 Discharge Sampling.........................................................................................5
3.2.1.3 Background Site Selection...............................................................................5
3.2.1.4 Results................................................................................................................6
3.2.1.5 Downstream (Lake Norman) Analytical Results.........................................7
3.2.1.6 Conclusion.........................................................................................................8
3.2.2 Option 2 — Engineered Solution............................................................................8
3.2.3 Option 3 — Basin Dewatering and Closure........................................................10
3.2.4 Selection of Preferred Option..............................................................................12
3.3 Specific Plans to Prevent the Unpermitted Discharges.........................................12
3.4 Schedule for Implementation....................................................................................12
3.5 Effectiveness Monitoring Plan..................................................................................13
3.6 Other Information Related to the Correction of Unpermitted Discharges ........13
3.6.1 Historical Status of S-1 and S-2...........................................................................13
4.0 CONCLUSIONS.............................................................................................................15
5.0 REFERENCES..................................................................................................................16
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Unpermitted Discharge Corrective Action Plan
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LIST OF FIGURES
Figure 2-1
Site Location Map
Figure 2-2
Site Layout Map
Figure 2-3
1893 USGS Topographic Map
Figure 3-1
Piper Diagram - Surface Water, Pore Water, and Background
Groundwater
Figure 3-2
pH Box Plot - Shallow Groundwater and Outfalls 101 and 102
LIST OF TABLES
Table 2-1 USGS Map Review Summary
Table 3-1 Surface Water and Outfall Analytical Results
Table 3-2 Background Groundwater Analytical Results
LIST OF APPENDICES
Appendix A
Natural Resources Technical Report
Appendix B
Jurisdictional Wetlands and Streams Preliminary Plat
Appendix C
Historical USGS Topographic Maps
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Unpermitted Discharge Corrective Action Plan June 15, 2017
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LIST OF ACRONYMS
2B Standard
NCDEQ/DWR Title 15, Subchapter 02B. Surface Water and
Wetland Standards
AMEC
AMEC Foster Wheeler Environment & Infrastructure, Inc.
AOW
Area of wetness
CAMA
Coal Ash Management Act
CAP
Corrective Action Plan
FGD
Flue gas desulfurization
IWC
Instream waste concentration
(NC) DEQ
North Carolina Department of Environmental Quality
NC WAM
North Carolina Wetland Assessment Method
NPDES
National Pollutant Discharge Elimination System
MSS
Marshall Steam Station
TDS
Total dissolved solids
USACE
United States Army Corps of Engineers
USGS
United States Geological Survey
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1.0 INTRODUCTION AND PURPOSE
The purpose of this Discharge Assessment and Corrective Action Plan is to provide the
North Carolina Department of Environmental Quality (DEQ) with requested
information to evaluate the permitted seeps (S-1 and S-2). These seeps are included as
Outfall 101 and Outfall 102 within National Pollutant Discharge Elimination System
(NPDES) Permit NC00004987 which became effective October 1, 2016. This document
meets the requirements of N.C.G.S. § 130A -309.212(c)(2) as requested in a DEQ letter
dated May 16, 2017 (Zimmerman to Draovitch).
The following requirements are contained in General Statute 130A -309.212(c)(2):
No later than 30 days from a notification pursuant to subdivision (1) of this subsection,
the owner of the coal combustion residuals surface impoundment shall submit a proposed
Unpermitted Discharge Corrective Action Plan to the Department for its review and
approval. The proposed Unpermitted Discharge Corrective Action Plan shall include, at a
minimum, all of the following:
a. One of the following methods of proposed corrective action:
1. Elimination of the unpermitted discharge.
2. Application for a National Pollutant Discharge Elimination System
(NPDES) permit amendment pursuant to G.S. 143-215.1 and Subchapter
H of Chapter 2 of Title 15A of the North Carolina Administrative Code to
bring the unpermitted discharge under permit regulations.
b. A detailed explanation of the reasons for selecting the method of corrective action.
C. Specific plans, including engineering details, to prevent the unpermitted
discharge.
d. A schedule for implementation of the Plan.
e. A monitoring plan for evaluating the effectiveness of the proposed corrective
action.
f. Any other information related to the correction of unpermitted discharges
required by the Department.
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2.0 SITE BACKGROUND
2.1 Plant Description
The Marshall Steam Station (MSS) is a four -unit, coal-fired electric generating plant
with a capacity of 2,090 megawatts located in Catawba County, North Carolina, near
the community of Terrell. The site is located north of NC Hwy 150, east of Sherrills
Ford Road and south of Island Point Road, and the surrounding area generally consists
of residential properties, undeveloped land, and Lake Norman (Figure 2-1).
2.2 Ash Basin Description
The ash basin system consists of a single cell impounded by an earthen dike located on
the southeast end of the ash basin. The ash basin system was constructed in 1965 and is
located approximately 2,000 feet northeast of the power plant. The area contained
within the ash basin waste boundary, which is shown on Figure 2-2, is approximately
382 acres in area.
The full pond elevation for the MSS ash basin is approximately 790 feet. The normal
pond elevation of Lake Norman is approximately 760 feet.
The ash basin is operated as an integral part of the station's wastewater treatment
system and receives inflows from the ash removal system, coal pile runoff, landfill
leachate, flue gas desulfurization (FGD) wastewater, the station yard drain sump,
stormwater flows, and station wastewater. Due to variability in station operations and
weather, inflows to the ash basin are highly variable. Inflows from the station to the ash
basin are discharged into the northwest portion of the ash basin.
Two active permitted landfills, the FGD Residue Landfill (Permit No. 1805) and
Industrial Landfill No. 1 (Permit No. 1812), one closed dry ash landfill consisting of two
units, dry ash landfill Phases I and II (Permit 1804), one closed demolition and
construction debris landfill, one closed asbestos landfill, and one fly ash structural fill
unit (PV structural fill) are located partially or wholly within the ash basin footprint.
2.3 Identification of Unpermitted Discharges
Pursuant to CAMA's requirement for the identification of discharges from CCR surface
impoundments (N.C. Gen. Stat. § 130A-309.210), Duke Energy Carolinas submitted on
December 31, 2014, a topographic map identifying all seeps and weeps discharging
from the MSS ash basin that were not captured by engineered channels. The
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topographic map identified two such seeps, identified as S-1 and S-2.' Since that time,
Duke Energy Carolinas has implemented procedures to identify new discharges
associated with the MSS ash basin, as set out in the Plan for Identification of New
Discharges, Marshall Steam Station Ash Basin (HDR, 2015) as required by General Statute
130A-309.210. To date, four inspections have occurred (October 22, 2015, May 27, 2016,
October 24, 2016, and May 26, 2017) with no new discharges identified.
Duke Energy Carolinas retained AMEC Foster Wheeler Environment & Infrastructure,
Inc. (AMEC) to evaluate the site for the presence of streams and wetlands. The result of
the evaluation was a Natural Resources Technical Report dated June 19, 2015.
Based on the Report, S-1 corresponds to Stream 12, identified as a potential perennial
stream that runs generally north to south and discharges to a finger of Lake Norman.
Stream 12 is approximately 1,342 linear feet, with an average width of 24 to 60 inches.
Lake Norman is a main -stem lake, therefore, the Catawba River Basin Buffer Rule
applies to Stream 12. AMEC used the United States Army Corps of Engineers (USACE)
Stream Quality Assessment Worksheets to score the quality of the stream on a scale
from 0 to 100. The stream was given a score of 67. Also based on the Report, the
channel associated with S-2 is located in the area identified as Wetland I. Wetland I is
approximately 0.37 acres and was classified as bottomland hardwood forest. The
Natural Resources Technical Report is included as Appendix A. The preliminary plat
prepared by McKim & Creed is included as Appendix B.
Duke Energy applied for NPDES permit coverage for S-1 and S-2 by application dated
October 9, 2014. Seepage areas S-1 and S-2 were permitted as Outfall 101 and Outfall
102 in the renewal of NPDES Permit NC0004987, effective October 1, 2016. As stated
above, no other discharges have been identified through regular inspections conducted
in compliance with the Plan for Identification of New Discharges. Accordingly, there are
no unpermitted discharges from the MSS ash basin.
I The labels S-1 and S-2 have not always been used consistently in discussions between Duke Energy
Carolinas and the Department. In some cases they have been used to refer to the entire wet area, while in
other cases they have been used to refer to a discrete sampling point in the wet area. For the purposes of
the topographic map the labels S-1 and S-2 referred to the entire wet area.
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3.0 CORRECTIVE ACTION PLAN
3.1 Proposed Corrective Action
Duke Energy Carolinas proposes as corrective action a combination of maintaining
NPDES permit coverage and eliminating seeps through ash basin dewatering and
closure. Dewatering and closure is expected to eliminate the discharges of wastewater
at S-1 and S-2, and will be undertaken by Duke Energy Carolinas in compliance with
other provisions of CAMA. However, because that process will not be complete for
several years, Duke Energy Carolinas also proposes the interim measure of permitting
as the preferred method of addressing seeps for the purpose of this Unpermitted
Discharge Corrective Action Plan. As explained further below, Duke Energy Carolinas
has concluded that permitting is an appropriate interim step because an analysis of
sampling data indicates these flows have a minimal impact on receiving waters and
pose no threat to the environment.
Duke Energy Carolinas also considered short-term options to eliminate the seeps.
Short-term efforts, such as engineered solutions to reroute seeps or capture
groundwater, have significant secondary environmental impacts, including removal of
forested areas and disturbance of potential wetlands to provide access to the seep
locations. These solutions also have costs that are significantly out of proportion to
their environmental benefits.
3.2 Detailed Explanation of the Reasons for Selecting the Method of
Corrective Action
In selecting a proposed corrective action, Duke Energy considered the environmental
and financial costs and benefits of several options, as well as the timing under which
those options might be implemented.
3.2.1 Option 1 — NPDES Permitting
As stated in N.C. Gen. Stat. § 130A -309.212(c)(2), application for an NPDES permit is a
statutorily approved method of corrective action for unpermitted discharges.
Permitting provides the environmental benefit that water quality in S-1 and S-2 will be
routinely and consistently monitored, allowing the Department to mandate further
action if a change in conditions leads to an adverse environmental impact.
Additionally, under a permitting approach, Duke Energy Carolinas can take steps to
affect water quality in S-1 and S-2.2 Permitting does not immediately affect the quantity
or quality of the discharges, but an analysis of sampling data indicates that the
2 For example, limestone baskets have been placed within flow channels at each seep to increase pH that
has been intermittently measured near 6.0 standard units.
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discharges do not currently cause adverse impacts to the receiving waters. The analysis
is as follows:
3.2.1.1 Seep Description
As stated above, S-1 is permitted as Outfall 101 and is described as a channel
approximately 2 feet wide and 4 inches deep with slow flow and pockets of standing
water. The channel is located in a natural depression that pre-existed the ash basin, but
flow was likely at most only intermittent prior to the construction of the ash basin (see
discussion in 3.6.1 below). Orange aerobic bacteria/floc/iron-oxidation sheen is visible
on substrate; the source of the channel was observed at two head cuts upstream of
designated location.
S-2 is formed at the confluence of seepage from an area of rip rap adjacent to former
stormwater outfall 001 and within a depression of a displaced tree root ball. S-2
discharges through a small erosional feature formed primarily by stormwater runoff
from the ash basin dam. Orange aerobic bacteria/floc/iron-oxidation is visible on
substrate.
3.2.1.2 Discharge Sampling
Samples were collected from S-1 and S-2 during the initial inspection in 2014. Monthly
sampling of Outfalls 101 and 102 was initiated once NPDES permit NC00004987 became
effective on October 1, 2016. Sampling methods and analyses that are currently used
are described in the Standard Operating Procedure for Seep Sampling (ADMP-ENV-EHS-
00002) prepared by Duke Energy (March 24, 2016).3
3.2.1.3 Background Site Selection
Implementation of the comprehensive site assessment at the MSS included sampling
numerous surface water locations across the Site. Two surface water sample locations
to the north and west of the ash basin (SW -7 and SW -8) have been determined to
represent background surface water quality through multiple lines of evidence. These
samples are considered upstream of the ash basin impoundment as required by 130A -
309.212(b)(1).
SW -7 and SW -8 are situated topographically and hydraulically up gradient of the ash
basin impoundment. Approximate elevations of SW -7 (836 feet) and SW -8 (835 feet) are
45 feet above the full pond elevation (790 feet) of the ash basin (Figure 2-2). Surface
3 Some of the earlier samples were collected before the Standard Operating Procedure was developed.
These samples should be considered less reliable, as they may reflect contributions from sediment
disturbed during the collection process.
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water and groundwater flow from these locations to the south and east toward the ash
basin.
An analysis of the major anions and cations in samples from these locations also
confirms that water quality at these locations is similar to the water quality of
groundwater found at designated background locations at the MSS site. The Piper
diagram included as Figure 3-1 demonstrates SW -7 and SW -8 are calcium -bicarbonate
type water, similar to designated background groundwater monitoring wells at the
MSS. Note the difference from SW -2 and SW -10 which represent free water within the
ash basin and are indicated by calcium -sulfate type water.
In addition to the recent assessment work conducted at the Site, the USGS has
conducted a regionally significant hydrogeologic evaluation of groundwater flow and
groundwater quality in the vicinity of the MSS. The five year study at the Langtree
Peninsula Research Station (on a nearby shore of Lake Norman) provides a reference
location to further inform background water quality conditions in the region.
Observations from this study indicate the majority of samples collected were calcium -
bicarbonate water type, consistent with findings in the CSA.
3.2.1.4 Results
On March 21, 2017, Duke Energy Carolinas submitted the report required by MSS's
NPDES permit condition A.(30). This evaluation confirmed that Outfalls 101 and 102
(and the other discharges from the station) do not cause contravention of water quality
standards for constituents listed in A.(29) of the permit.
Analytical results from background surface water locations SW -7 and SW -8 routinely
meet the 15A NCAC 02B surface water quality standards (2B Standards) for freshwater
aquatic life and water supply. A single exceedance of total dissolved solids at SW -8 is
noted on Table 3-1.
Flows in Outfall 101 have mostly been between 10 and 15.5 gallons per minute, with a
high flow of 17.95 gallons per minute recorded on May 27, 2016. Flows in Outfall 102
were too low to measure consistently and accurately prior to the use of a graduated
cylinder and stopwatch method. Measured flows since the use of this method began
have been 1 gallon per minute or less.
The 2B surface water quality standards are not directly applicable to Outfalls 101 and
102 due to their current designation as effluent channels, but for this analysis, sample
results from Outfalls 101 and 102 were also compared to existing adopted standards
found in 15A NCAC 2B 0.0200 as a measure of the level of impact from ash basin
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Marshall Steam Station
discharges. Measured pH values at both Outfall 101 and Outfall 102 are generally
within the 2B Standard range of 6.0 to 9.0 s.u. with intermittent measurements at or
below 6.0 s.u. prior to the institution of the sampling SOP. Duke Energy evaluated the
potential for natural conditions to cause non-compliance with NPDES permit conditions
for pH, total hardness, and total suspended solids at the Riverbend Steam Station
(Sideris to Poupart, July 25, 2016). This effort can be applied to the Marshall Steam
Station as both Marshall and Riverbend are located within similar geologic settings,
specifically the Piedmont region of North Carolina (Charlotte Terrane). Similar to the
case presented at Riverbend, flow from the Marshall seepage outfalls consists of a
mixture of source water and is likely influenced by naturally low pH background
groundwater conditions. Figure 3-2 illustrates the water chemistry from Outfall 101
and Outfall 102 is within the range of background pH values at the Site. Background
groundwater analytical results are presented in Table 3-2. As demonstrated by sample
results from well BG -1S, pH values ranging from 5.2 to 6.1 demonstrate the low pH
groundwater in the Marshall area and the potential background pH impacts on Outfalls
101 and 102. Total hardness is routinely detected above 100 mg/L at both Outfall 101
and Outfall 102. Like pH, total hardness observed at outfalls can represent a
contribution from groundwater conditions. Calculated total hardness values in
background monitoring wells at the MSS range from 10 mg/L to 167 mg/L.
At Outfall 101, no additional values in excess of the 2B Standards have been measured
since October 2015. High results for sulfate measured before October 2015 have not
been repeated since Duke Energy implemented the SOP and are most likely an artifact
of sediment collected with the sample.
At Outfall 102, chloride, mercury, and total dissolved solids (TDS) have been measured
above the 2B Standards. Analytical results and comparison of ionic composition
(Figure 3-1) suggest Outfall 102 reflects a larger contribution from impacted
groundwater than Outfall 101. This is consistent with its topographic setting between
larger recharge areas.
3.2.1.5 Downstream (Lake Norman) Analytical Results
As previously stated, on March 21, 2017, Duke Energy submitted the report required by
the MSS NPDES permit's condition A.(30). This evaluation confirmed that Outfalls 101
and 102 (and the other discharges from the station) do not cause contravention of water
quality standards for constituents listed in A.(29) in Lake Norman. Sample locations
SW -9 and SW -11 were collected from the receiving water (Lake Norman) near the MSS
(Figure 2-2) and are considered to be near field downstream sample locations in
accordance with 130A-309.212(b)(1)a. Surface water quality standards are not exceeded
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at either SW -9 or SW -11 (Table 3-1). A single estimated (biased high) value for copper
was reported in October 2015.
3.2.1.6 Conclusion
Based on this data, continued permitting of Outfalls 101 and 102 is appropriate. Both
Outfall 101 and Outfall 102 contain ash basin discharges based on a comparison against
background surface water samples. In particular, both outfalls have higher
concentrations of boron, calcium, total hardness, sulfate, and TDS. Outfall 102 also has
higher concentrations of chloride and mercury. Of these constituents, boron, sulfate,
and mercury are most likely attributable to ash basin impacts. Total hardness and
calcium are most likely a result of a greater groundwater input to Outfalls 1 and 2 than
to the background surface water samples.
When compared against surface water quality standards, concentrations measured at
Outfall 101 are at or below the standards for all constituents except total hardness. To
the extent total hardness reflects a natural condition, this would not be considered a
violation of a water quality standard pursuant to 15A NCAC 02B. 0205. Outfall 102 is at
or below all standards except for total hardness, chloride, mercury, sulfate, and TDS.
Neither Outfall 101 or 102 is causing adverse impacts to a jurisdictional surface water.
Outfall 101 is identified in the AMEC Natural Resources Report as a jurisdictional
stream, but constituents in the stream from the ash basin are below water quality
standards. Outfall 102 is not itself identified as a jurisdictional feature on the AMEC
Natural Resources Report. It is located in an area identified as a jurisdictional wetland,
but constituents in Outfall 102 have not caused, and are not expected to cause, adverse
impacts to the wetland. Outfall 102 is characterized by low volume, inconsistent flow.
Stormwater and groundwater flow to the erosional feature rather than to the wetland,
and flows through the erosional feature have no effect on the ability of the wetland to
support normal functions. Additionally, the volume of flow (typically less than a gallon
per minute) is not sufficient to impact Lake Norman.
3.2.2 Option 2 — Engineered Solution
Duke Energy also considered the use of engineered solutions to serve as an interim
method of eliminating the discharge. As stated below, dewatering and basin closure
will provide a long-term approach to eliminating the seeps. Until that process begins,
an engineered solution could be used to collect and reroute or treat these seep
discharges. Duke Energy has implemented engineered solutions at some of the other
Duke Energy sites.
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Prior to the implementation of an engineered solution, a significant amount of time is
required to evaluate potential designs and technical approaches to accomplish the
solutions. Where practicable, there are a range of potential solutions that generally
involve collecting and pumping the flow back to the ash basin. However, in many
cases, solutions are nearly infeasible as many low flow seeps only present themselves
within feet of the surface receiving water body.
In addition, an engineered solution would require appropriate permitting including
construction in a floodway (due to proximity to water bodies), 401/404 due to the
presence of wetlands, impacts to rare, threatened, and endangered species, evaluation
of the presence of nesting birds (for tree cutting), erosion and sediment control,
evaluation of buffer permitting requirements and potential modification of the NPDES
permit to include these redirected flows.
Construction efforts to complete the actual measure are often significant. Roads for
equipment access are required to complete construction. Access routes and platforms
are frequently required for implementing sampling safely. Finally, significant efforts to
control groundwater intrusion into the required excavations are required.
Specific obstacles at Marshall include the following:
S-1 is located in a wooded area. Installation of a capture and pump system
would involve disturbing the area, including the adjacent wetlands. A pumping
system would necessarily capture natural stormwater flow unrelated to the
basin.
• Capture of S-1 would require the construction of a permanent access road to that
location.
Both S-1 and S-2 are located in areas without current access to electricity. Use of
pumps would require extending power lines. S-1 and S-2 are not close enough
together to use the same power line.
The costs to install seep reroute systems at other Duke Energy sites (not including
operation and maintenance) are as follows:
Site 1 - $1,250,000 (once permanent power is installed)
o Two seep collection locations
o Each location involved a sump, a pump station, a valve box, and above- and
below -ground piping
o Required installation of power lines
o Permitting by USACE and NCDEQ
o Collects 30 gallons per minute
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• Site 2 - $700,000
o One seep treatment location
o Passive treatment to adjust pH
o Permitting by NCDEQ
o Treats 1 gallon per minute
• Site 3 - $1,185,000
o One seep location involving a pump station, valve box, and above -ground
piping
o Required installation of power lines
o Permitting by USACE and NCDEQ
o Collects 25 gallons per minute
Given this experience and constraints at Marshall, Duke Energy estimates the cost of a
seep reroute system to capture S-1 and S-2 at approximately $2,000,000. Combined seep
flows at Marshall are less than 20 gallons per minute. As stated above, the data
collected in and around S-1 and S-2 indicate a lack of environmental impact and
indicate low IWC (instream waste concentration) and pollutant contribution
(0.000004% IWC in the case of S-2).
Moreover, collecting and pumping back the ash basin provides a short term solution at
best and would have to be modified to support dewatering of the basin which is the
ultimate goal. Collecting and pumping directly to Lake Norman provides limited if any
benefit to the environment.
Based on this analysis, Duke Energy has concluded that an engineered solution is not
appropriate for these seep discharges that are currently addressed in the Marshall
NPDES wastewater permit.
3.2.3 Option 3 — Basin Dewatering and Closure
The third option considered by Duke Energy Carolinas consists of the following steps:
(1) Eliminate the introduction of industrial stormwater to the ash basin pursuant to
CAMA by December 31, 2019; (2) Decant and dewater the treated ash basin free water
and interstitial water from the basin through NPDES outfall 002 as authorized by the
existing NPDES permit; and (3) Cap and close the ash basin, if allowed under CAMA,
in accordance with applicable deadlines. This is a financially costly option and can be
expected to have secondary environmental impacts resulting from the work necessary
to complete the process. However, since closure is already required by CAMA, the
costs and secondary environmental impacts will be incurred regardless of the corrective
action for seep discharges, so they do not materially impact the analysis of this option.
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Decanting the free water will reduce the hydraulic head within the basin thereby
decreasing the hydraulic gradient and reducing seepage flow at outfall 101 and 102.
This is consistent with the authorization issued by the Department of Environmental
Quality and concurrence from the Federal EPA in letters dated December 14, 2015 and
December 15, 2015 respectively. Demonstrated examples of the effectiveness of this
concept are as follows:
• Twelve seep locations were observed at the Riverbend Steam Station prior to
decanting the ash basin. Currently, following basin decanting, flow is currently
observed at only two seep locations.
• Following removal of ash basin water through normal operations at Dan River,
only one seep continues to have minimal flow compared to the three previously
identified seeps prior to lowering the basin level. Flow from the remaining seep
outfall at Dan River has an average measured flow of 0.00025 MGD.
In the longer term, closure of the ash basin under CAMA, utilizing an engineered cover
system for the ash basin and breaching of the impounding dike, combined with the
CAMA required elimination of stormwater and discharges of wastewater to the basin
will significantly lessen the already negligible impact to water quality from the ash
basin influence on outfalls 101 and 102. Groundwater modeling performed for the
Corrective Action Plan Part 2, Marshall Steam Station Ash Basin (CAP Part 2) (HDR, 2016)
simulated the effects of capping source areas with an engineered cover system. The
engineered cover system will prevent direct infiltration into the covered ash basin. The
following excerpt is included as Appendix B - Groundwater Flow and Transport Model
within the CAP Part 2 and describes the model scenario and findings:
The Cap -in -Place scenario simulates the effects of covering the ash basin, dry ash
landfill Phases I and II, and the PV structural fill with an engineered cap. In the
model, recharge at the ash basin, dry ash landfills and PV structural fill, is set to
zero. Groundwater flow is affected by this scenario as the water table is lowered
and groundwater velocities are reduced beneath the capped areas. The water table
just upgradient of the earthen dam in the ash basin is reduced by approximately
10 feet, and in the ash basin between the PV structural fill and dry ash landfill
Phase II, it is reduced by approximately 1 foot.
Duke Energy's preliminary plans for closure of the ash basin at Marshall include
breaching the dike and grading the material in the basin prior to placement of the
engineered cover system. Breaching the dike and grading of the material within the
basin would likely provide additional lowering of the water table in this area.
Page 11

Unpermitted Discharge Corrective Action Plan June 15, 2017
Marshall Steam Station
Since the hydraulic head from the ash basin is presumed to be the primary source of the
seepage at Outfalls 101 and 102, reduction in the head from capping will contribute to
decreases, if not elimination of the flows and the associated ash related constituents at
these outfalls. This concept is supported by previous concurrence from both NCDEQ
and the US EPA in letters dated December 14, 2015 and December 15, 2015 respectively
that authorized decanting of free water in order to mitigate flows from seepage at
several Duke Energy owned facilities in North Carolina.
3.2.4 Selection of Preferred Option
Based on the information presented above, Duke Energy Carolinas proposes a
combination of Options 1 and 3. This combination will be sufficient to protect public
health, safety, and welfare; the environment; and natural resources. At the same time,
this approach, unlike Option 2, does not require the expenditure of significant amounts
of time and money to address discharges with minimal environmental impact as an
interim measure prior to the implementation of the final remedy, which is dewatering
and closure.
3.3 Specific Plans to Prevent the Unpermitted Discharges
Duke Energy Carolinas intends to implement the proposed corrective action as follows:
S-1 and S-2 are already included in NPDES permit NC00004987. Duke Energy
Carolinas will continue to monitor and report results as set out there. A detailed ash
basin closure plan meeting the requirements of CAMA shall be developed and
submitted in accordance with the schedule set out in N.C. Gen. Stat. § 130A-309-214.
3.4 Schedule for Implementation
CAMA requires elimination of stormwater discharges and discharges of wastewater to
the ash basin no later than December 31, 2019. The completion of ash basin closure will
depend on the submittal of the closure plan, review, and approval schedule developed
by DEQ and Duke Energy and has not been finalized.
CAMA requires that low-risk sites be closed no later than December 31, 2029. In order
to perform the site preparation required to properly construct the engineered cover
system, the free water in the basin will be removed or decanted, and the remaining ash
dewatered sufficiently to grade for placement of the engineered cover system. The
schedule for these activities cannot be developed prior to the approval of the closure
plan by the Department.
Page 12

Unpermitted Discharge Corrective Action Plan June 15, 2017
Marshall Steam Station
3.5 Effectiveness Monitoring Plan
In accordance with § 130A -309.212(2).e., NPDES permit conditions A.(8), A.(9) and
A.(30) require monitoring and reporting of a number of activities. Permit conditions
A.(8) and A.(9) require monthly monitoring and reporting of flow volumes and
concentrations of 24 other constituents from outfall 101 and 102. For comparison, this is
more ongoing characterization than the permit requires from discharges from the main
ash basin discharge outfall 002. Permit condition A.(30) required a demonstration that
water quality standards are not contravened. This was submitted to the NC DEQ dated
March 21, 2017.
3.6 Other Information Related to the Correction of Unpermitted
Discharges
3.6.1 Historical Status of S-1 and S-2
As requested in the Department's May 16 letter, Duke Energy Carolinas has studied the
historical status of S-1 and S-2, with the goal of determining whether they existed as
water bodies before the ash basin was placed in service. The research is inconclusive as
to whether S-1 existed as perennial surface water before the ash basin began operation.
No reference to the feature identified as S-2 is indicated on any of the historic maps. A
review of available historical United States Geological Survey (USGS) maps was
conducted to identify potential perennial streams that may have existed in the areas
where Outfall 101 and Outfall 102 are located before construction of the ash basin.
Large scale (1:250,000) maps exist for the Charlotte area including the future site of the
Marshall Steam Plant from 1953, before Lake Norman was built (Appendix Q. These
maps do not show perennial streams in the area of interest. A historical map of
Statesville, NC, dated 1893, at a scale of 1:125,000, shows a modern outline of the ash
basin and Lake Norman shoreline geo-referenced to the 1893 map (Figure 2-3). No
stream is shown on the 1893 map that coincides with the location of Outfalls 101 and
102. A small scale map has not been located for the site prior to the construction of Lake
Norman or the Marshall Plant.
The earliest map available with detail in the area of Outfall 101 and Outfall 102 is the
1970 Lake Norman North map (1:24,000). The ash basin was constructed in 1965. The
1970 map does not show perennial streams at the outfall locations, however the
drainage where Outfall 101 is located is marked with a dashed blue line which is the
USGS symbol for an intermittent stream. This map shows the intermittent stream
extending up the drainage feature to approximately elevation 795 feet. The elevation of
Page 13

(-Inpermitted Discharge C(,Vrective Action Plan
MardwIl S'tcmn Siaticin
ILHIC 1:�, 2017
the ash basin Shown oil the 1970 map is below (21evation 785 and above clevation 780,
indicating the intermittent stream was not driven entirely by groundwater omanating
from the ash basin. The full CUrrent pond elevation of the ash basin is 790 f(.,ct. No
Intermittent or Perennial streams are indicated in the area Of OL]tfilll
presents a detailed SLA.111mary cif historical maps available fOI- OLItf�ffl
102.
Page W
102. Table 2-1
101 and Outfall

Unpermitted Discharge Corrective Action Plan June 15, 2017
Marshall Steam Station
4.0 CONCLUSIONS
This Unpermitted Discharge Corrective Action Plan for Marshall Steam Station has
been produced in accordance with 130A -309.212(c) and the DEQ letter dated May 16,
2017 (Zimmerman to Draovitch). As set forth here, Duke Energy Carolinas proposes a
combination of permitting and eliminating of the discharges through basin dewatering
and closure. The analysis presented above demonstrates that permitting is an
appropriate interim solution and that basin dewatering and closure can be expected to
eliminate the discharges in the long-term.
The analysis presented here demonstrates that NPDES Outfalls 101 and 102 are not
causing a violation of water quality standards. pH and total hardness at outfall 101 are
significantly influenced by the background conditions. Permitting with requirements to
monitor and report, re-route inflows away from the basin, decanting of the free water,
dewatering of the interstitial water and closure actions are appropriate. Given the lack
of impact, substantial efforts and resources to collect, re-route or other similar corrective
actions of seeps are not warranted.
Page 15

Unpermitted Discharge Corrective Action Plan June 15, 2017
Marshall Steam Station
5.0 REFERENCES
Duke Energy. 2016. Standard Operating Procedure for Seep Sampling (ADMP-ENV-EHS-
00002), Revision 0, March 24, 2016.
Heath, R. C. 1984. Ground -water Regions of the United States. U.S. Geological Survey
Water Supply Paper 2242, 78 p.
LeGrand, Harry E., Sr. 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.
NC DEQ. 2010. North Carolina Wetland Assessment Method (NC WAM), Version 4.1,
October 2010.
HDR Engineering, Inc. 2015. Plan for Identification of New Discharges, Marshall Steam
Station Ash Basin, rev. May 19, 2015.
HDR Engineering, Inc. 2016. Corrective Action Plan Part 2, Marshall Steam Station Ash
Basin, March 3, 2016.
Page 16

tted Discharge Corrective Action Plan
Marshall Steam Station
FIGURES
June 15, 2017

Z
i,
\ IR.AND PUINT
SURFACE IMPOUNDMENT BOUNDARY
- s �
_ y e
AIOUTFALL 101
Al
SURFACE
IMPOUNDMENT I
OUT FALL 102 I i
j-7 r
n►vi �� l /'I' ,
LAKE NORMANYo \
Iso
1 MARSHALLSTEAM
PLANT PARCEL LINE
� - 1 coRnoN sr�--
is Terrell':
I \
sy -,
1, i,=�� Fag a�A �_• y.�'( �L/ ��
Ir x M
150
SOURCE:
USGS TOPOGRAPHIC MAP OBTAINED FROM THE USGS STORE AT
http://store.usgs.gov/b2c_usgs/b2c/start/%%%28xcm=r3standardpitrexyrA%%%29/.co p1 1-'t � t
FIGURE 2
DUKE
GRAPHIC SCALE SITE LOCATION
MAP
ENERGY o soon sono MARSHALL STEAM PLANT
IN FEE- 8320 NC HIGHWAY 150 E
CAROLINAS TERRELL, NORTH CAROLINA

i
I
I �
Ire
s
` A
1
SURFACE I
IMPOUNDMENT
..`BOUNDARY
1
est
(SOURCE:
SEPTEMBER 1893 USGS TOPOGRAPHIC
'DUKE
ENERGY
CAROLINAS
ED
0
STORE AT
GRAPHIC SCALE
600 0 600 1200
IN FEE-
rr
�l
_ 1 0.
1 ' *44
MARSHA L STEAM
PLANT PARCEL LINE
LAKE NORMAN
FIGURE 2-3
1893 USGS TOPOGRAPHIC MAP
MARSHALL STEAM PLANT
8320 NC HIGHWAY 150 E
TERRELL, NORTH CAROLINA

Background Locations
Outfall -102
80% 2
�O
60%
W
0
Outfall -101 00
\)
`O
o •sW-11
OSW-8
0SW-7
6
20%
SW-2/SW-10
i�---Outfall-102
X00 0 �x
Outfall -101
O\o S
/ Outfall -101
O
X R
,rV ° 60% "O
VO • Y
Il� °
° 40%`
CPO Outfall 102
0
. • - `0%
Q � O\O O�° 00 OXO
CPO. -6 Oo Oo CO �O 00 e
0 0 0 0
4 -Ca- -CI-►
Sample ID % Difference
s-1 0.51
5-2 2.01
SW 2 2.57
SWS 1.56
S 7 14.1
W
SW 9 15.9
sw-6 11.2
sU to 7.2
sW 11 6.9
5 1 3.9
BGID 14.1
BGIS 66.0
9G2BR 5.]
B 2 16.6
BG38R 10.8
BGM 9.03
8- %.
MW -4 5.80
MW -4D 8.43
A&105 3.W
A&IML 5A0
A&12S 35.6
A&12SL 0.59
A&135 3.71
AB -14S o.m
AB -15S 5.57
A&15SL 5.25
A&17S 3.16
A&195 6.08
A&21S 37.5
A&3S 820
AB -45 &3
AB -45L 142
ABSS ]0.0
ABos 0.84
A&75 1.70
A 1216
ALS 2.64
Notes:
• Surface Water
-, Background Surface Water
Background Groundwater
Ash Pore Water
# Outfall (Seep)
Retl lent intllcaies ion charp Ealance percent tli9erence Brener
man 10%.
Data inclutletl br analysis hom MarcF-ApM 2017 antl May 2 01 6
10-11, only)
FIGURE 3-1
f/, DUKE PIPER DIAGRAM
SURFACE WATER, PORE WATER, and BACKGROUND
GYP. GROUDNWATER
ENER
MARSHALL STEAM STATION
CAROLINAS DUKE ENERGY CAROLINAS, LLC
TERRELL, NORTH CAROLINA

Shallow Groundwater
Outfall 102
Outfall 101
Shallow groundwater pH values
include monitoring wells BG -1S,
BG -3S, and MW -4 (Table 4-2).
Monitoring well BG -2S excluded due
to elevated pH conditions potentially
related to monitoring well
construction.
Outfall 101 and Outfall 102 data
summarized in Table 4-1.
5.0 5.5 6.0 6.5 7.0
pH
FIGURE 3-2
DUKE
D
pH BOX PLOT
SHALLOW GROUNDWATER and
`
EN ERr'Y
�1 "v
OUTFALLS 101 and 102
MARSHALL STEAM STATION
CAROLINAS
DUKE ENERGY CAROLINAS, LLC
TERRELL, NORTH CAROLINA

Unpermitted Discharge Corrective Action Plan June 15, 2017
Marshall Steam Station
TABLES

TABLE 2-1
USGS MAP REVIEW SUMMARY
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Map Name
Date
Scale
Summary
NC Statesville 164629 (1893)
1893
1:125,000
1893 topographic map reprinted 1934, limited detail due to absence
of landmarks in area of interests. Streams are marked but unable to
determine location of outfall without geo-referencing to a modern
map.
NC Statesville 164631 (1893)
1893
1:125,000
1893 topographic map reprinted 1945, geo-referenced with modern
Lake Norman shoreline to identify pre-existing streams. See Figure
2-3 topographic map incorporating information.
NC Charlotte 164183 (1960)
1960
1:250,000
Topographic map of Charlotte and surrounding areas, large scale,
pre Lake Norman. No streams apparent in area of interest.
NC Charlotte 164184 (1953)
1967 revision
1:250,000
Topographic map of Charlotte and surrounding areas, large scale,
(1953)
with revision in 1967 to show Lake Norman. Due to large scale,
detail is unreliable but no streams drawn in area of interest.
NC Lake Norman North 162803 (1970)
1970
1:24,000
1970 USGS topographic map of northern Lake Norman area. Small
scale with good detail. Drainage feature near Outfall 101 is mapped
as an intermittent stream (dashed blue line).
NC Charlotte 164185 (1953)
1974 revision
1:250,000
Topographic map of Charlotte and surrounding areas, large scale,
(1953)
revision 1974. Ash basin is shown. No streams apparent in area of
interest.
NC Lake Norman North 161507 (1970)
1983 update
1:24,000
1970 USGS topographic map of northern Lake Norman area.
(1970)
Photoinspected/updated in 1983. Small scale with good detail.
Drainage feature near Outfall 101 is mapped as an intermittent
stream (dashed blue line). Note elevation of ash basin
impoundment approximately 760 feet.
NC Salisbury 163118 (1985)
1985
1:100,000
1985 USGS planimetric map of Salisbury, NC. The Marshall Steam
Station is located in the southwest corner of the map. No
intermittent or perenial streams are shown in the area of interest.
NC Lake Norman North 161509 (1993)
1993
1:24,000
Outline of Ash Basin on 1993 topographic map. The area of outfall
101 is shown as a dashed blue line (intermittent stream).
NC Lake Norman North 2016063
2016
1:24,000
2016 USGS topographic map of northern Lake Norman area. Small
scale with great detail. Drainage feature near Outfall 101 is mapped
as an intermittent stream (dashed blue line).

TABLE 3-1
SURFACE WATER AND OUTFALL ANALYTICAL RESULTS
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
2FIE01111
FIELD PARAMETERS
Comparative
Values
Analytical Parameter
pH
ORP
DO
Spec
Cond
Turbidity
Temp
Flow
Arsenic
Arsenic
(dis)
Barium
Beryllium
(dis)
Cadmium
( dis)
Chloride
Chromium'
(dis )
Copper
(dis )
Fluoride Lead (dis)
Mercury
Nickel
Nickel
(dis)
Nitrogen,
(NO,
+ NO3)
Oil and
Grease
Selenium
Sulfate
Total
Dissolved
Solids
Total
Suspended
Solids
Total Hardness'
(Ca + Mg)
Zinc
(dis)
15A NCAC 02B (Class
B, Water Supply) 6.0 - 9.0*
NE
5.0
NE
25
NE
NE
10
150*
1
6.5*
0.32-1.35
250*
49-231'
5.8-29'
1.8*
0.54*
0.012*
25
34-168'
10
NE
5*
250
500
NE
100
78-382'
NPDES Discharge
Limitations (Daily Maximum)
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
20
--
--
--
300'
--
--
Reporting Units
S.U.
mV
mg/L
umhos/cm
NTU
Deg C
gal/min
ug/L
ug/L
mg/L
ug/L
ug/L
mg/L
ug/L
ug/L
mg/L
ug/L
ug/L
ug/L
ug/L
mg/L
mg/L
ug/L
mg/L
mg/L
mg/L
mg/L (CaCO3)
ug/L
Fraction
N
N
N
N
N
N
N
T
D
T
D
D
N
D
D
I N I
D
T
T
D
N
N
T
N
N
N
T
D
Location IO
Sample
Collection Date
Collected
Under SOP
BACKGROUND SURFACE WATER ANALYTICAL RESULTS
10/1/2015
NA
6.6
22
5.67
70
26.4
18
--
0.27 J
0.18 J
0.044
< 0.2 U
< 0.08 U
3.00
0.52
0.33 J
--
< 0.1 U
< 0.2 U
0.223
0.21)
0.0983-
--
< 0.5 U
7.50
84.0
12.9
16.4
< IOU
4/11/2016
NA
7.2
258
7.11
83
8.1
17
--
0.12
0.078)
0.036
< 0.1 U
< 0.08 U
2.00
0.641+
0.51
--
< 0.1 U
0.00166
< 0.5 U
< 0.5 U
0.14
--
0.463
0.91)
< 25.0 U
9.00
14.7
< IOU
6/24/2016
NA
7.0
161
6.5
91
12.7
20
--
0.22
0.12
0.037
< 0.1 U
< 0.08 U
1.90
0.65
1.4
--
< 0.1 U
0.00148
< 0.5 U
0.56
0.18
--
< 0.5 U
0.873
40.0
8.50
15.4
< IOU
SW -7
9/16/2016
NA
6.4
91
6.3
68
5.7
19
--
0.22
0.18
0.039
0.024)+
< 0.08 U
2.40
0.211
1.2
--
< 0.1 U
0.001881+
< 0.5 U
< 0.5 U
0.11
--
< 0.5 U
< 1.00 U
54.0
6.00
15.9
2.63
12/6/2016
NA
6.4
91
6.45
50
37.4
15
--
0.35
0.22
0.030
0.0873
< 0.08 U
2.30
0.29)
0.96
--
0.32
0.00514
c 0.5 U
< 0.5 U
0.052
--
< 0.5 U
1.50
57.0
14.0
10.6
< IOU
3/17/2017
NA
6.8
-41
6.6
65
6.2
12
--
0.143
0.0571
0.029
0.010)
< 0.080 U
2.30
0.241
< 0.50 U
--
< 0.10 U
0.000995)
< 0.50 U
< 0.50 U
0.20
--
0.33 )
0.651
77.0
20.1
13.6
4.23
10/1/2015
NA
6.8
-96
1.17
331
19.3
18
--
1.1
0.92
0.060
< 0.2 U
< 0.08 U
4.00
0.28 J
0.41)
--
0.0541
< 0.2 U
5
4.6
0.343-
--
0.46 J
31.7
119
13.0
49.1
7.3 J
4/11/2016
NA
7.1
125
7.41
69
8.3
16
--
0.087 J
0.068)
0.032
< 0.1 U
< 0.08 U
3.00
0.21)
0.94
-
< 0.1 U
0.0004161
< 0.5 U
0.64
0.30
--
< 0.5 U
1.50
30.0
< 2.5 U
18.2
< 10 U
6/23/2016
NA
7.2
128
5.4
174
10.8
25
--
0.13
0.073)
0.032
< 0.1 U
< 0.08 U
2.60
0.261
0.58
--
< 0.1 U
0.00161
< 0.5 U
< 0.5 U
0.46
--
< 0.5 U
0.953
5680
2.80
19.9
< IOU
SW -8
9/16/2016
NA
6.5
54
4.7
68
6.7
23
--
0.091
0.065)
0.037
0.0113+
< 0.08 U
2.70
0.341
0.291
--
< 0.1 U
0.000526
< 0.5 U
< 0.5 U
0.82
--
< 0.5 U
< 1.00 U
55.0
2.80
17.6
2.53
12/6/2016
NA
6.7
79
6.9
80
12.4
13
--
0.14
0.095 J
0.032
0.0181
< 0.08 U
3.70
0.23)
0.76
--
< 0.1 U
0.00214
< 0.5 U
< 0.5 U
0.12
--
< 0.5 U
2.00
62.0
5.40
15.9
2.71
3/17/2017
NA
6.1
-23
7.1
94
6.6
10
--
0.161
0.0663
0.031
< 0.10 U
< 0.080 U
2.70
0.36 J
< 0.50 U
--
< 0.10 U
0.001261
< 0.50 U
0.441
0.39
--
< 0.50 U
15.1
52.0
< 2.5 U
16.6
c 10.0 U
Location ID
Sample
Collection Date
Collected
Under SOP •
OUTFALL ANALYTICAL RESULTS
9/4/2014
No
6.6
-
--
>2700
--
--
--
<1
--
0.098
--
--
5.10
--
--
<0.5
--
<.05
1.93
--
--
<5
4.58
290
530
18.0
291
--
4/22/2015
No
6.3
--
--
164
-
<1
--
0.070
--
--
2.08
--
--
0.137
--
0.00277
2.66
--
0.016
<5
<1
48.5
130
5.00
60.9
--
10/22/2015
No
6.4
--
--
603
--
--
1.795
<1
--
0.110
--
--
5.70
--
--
0.180
--
0.000871
9.1
--
0.036
--
3.21
270
500
110
--
11/23/2015
No
__
__
__
-_
__
__
__
__
_-
__
__
__
__
__
__
__
_
0.00139
--
__
__
__
__
__
__
-_
__
Outfall 101
5/27/2016
Yes
6.3
--
--
901
--
--
17.95
< 1
--
0.087
--
--
4.30
--
--
<0.5
--
0.00353
3.41
--
<0.01
<5
1.55
89.0
190
88.0
103
--
11/7/2016
Yes
6.1
--
--
712
4.9
--
10
<1
--
0.146
--
--
100
--
--
<0.2
--
<.0005
2.8
--
0.02
<5
<1
140
420
<5.0
244
--
12/9/2016
Yes
6.2
--
--
610
--
--
--
<1
--
0.124
<1
<1
79.0
<1
<1
<0.2
--
c.0005
2.52
2.52
<0.01
<5
<1
140
410
<5.0
241
--
1/9/2017
Yes
6.6
--
--
535
--
--
15.4
<1
--
0.107
--
--
68.0
--
--
<0.2
--
<.0005
2.37
--
<0.01
<5
1.34
130
350
<5.0
209
--
2/2/2017
Yes
6.7
--
--
456
--
--
12
<1
--
0.111
--
--
55.0
--
--
<0.2
--
.00078
2.33
--
<0.01
<5
<1
90.0
280
8.00
153
--
3/6/2017
Yes
6.4
--
--
5845
--
--
12.5
<1
--
0.117
--
--
67.0
--
--
c0.2
--
.000703
2.1
--
<0.01
<5
1.03
120
320
7.00
201
--
AOW S-1 upstream
5/9/2016
7.2
--
--
192
--
--
0.494
<1
--
0.103
--
--
3.00
--
--
0.160
--
0.00568
4.88
--
0.01
--
2.1
62.0
150
16.0
80.1
--
4/22/2015
No
5.5
--
--
782
--
--
--
<1
--
0.081
--
--
154
--
--
<0.1
--
0.0021
<1
--
0.014
<5
<1
115
520
6.00
310
--
7/10/2015
No
5.6
--
--
895
--
--
--
1.74
--
0.107
--
--
230
--
--
0.190
--
0.036
1.43
--
0.096
<5
<1
140
890
31.0
455
--
7/18/2015
No
--
--
--
--
--
--
--
87.1
--
0.990
--
--
207
--
--
--
--
0.074
51
--
--
--
25.1
130
892
20.5
--
10/22/2015
No
6.3
--
--
977
--
--
0.449
1.51
--
0.096
--
--
230
--
--
<1.0
--
0.0207
1.37
--
0.489
--
2.49
130
660
15.0
--
--
11/23/2015
No
__
__
__
__
__
__
__
__
__
__
__
__
__
__
__
__
__
0.0352
Outfall 102
5/27/2016
Yes
6.0
--
--
970
--
--
--
1.3
--
0.110
--
--
220
<0.5
--
0.000843
2.72
--
<0.01
--
<1
130
680
200
410
11/7/2016
Yes
6.2
--
--
1062
0.6
--
<5
<I
--
0.087
--
--
240
--
--
<0.5
--
0.0103
1.58
--
0.36
<5
<1
130
670
<5.0
464
--
12/9/2016
Yes
6.6
--
--
1022
--
--
--
<1
--
0.085
<1
<1
230
<1
<1
<0.5
--
0.0123
1.7
1.69
0.32
<5
<1
140
760
<5.0
475
19
1/9/2017
Yes
6.6
--
--
658
--
--
0.25
1.25
--
0.055
--
--
140
--
--
<0.5
--
0.0112
1.67
--
0.27
<5
<1
100
440
<5.0
286
--
2/2/2017
Yes
6 .0
--
--
1 023
--
--
0.2
cl
--
0.088
--
--
220
--
--
<0.5
--
0.0172
<
3/6/2017
Yes
6.1
--
--
1076
--
--
1
1.04
--
0.088
--
--
240--
2FIE01111

TABLE 3-1
SURFACE WATER AND OUTFALL ANALYTICAL RESULTS
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Notes:
- - Bold and highlighted results Indicate value equal to or greater than current respective standard or critena [15A NCAC 028(Class B, WS -N), NPDES permit value]. Values for I5A NCAC 028, Class B, WS -W effective January 1, 2015.
< -rcentration not detected at or above Me adjusted reporting limit.
-- . Not Analyzed N - Normal *Value is the current 15A NCAC 02B Surface Water Quality Standard for Freshwater Aquatic Life
D - Dissolved NE - Not Established NA - Not Applicable Note the following from 15A NCAC 028 .0211 (11) Amended Eff. January 1, 2015:
Deg C - Degrees Celsius NTU - Nephelometric turbidity unit (e) Compliance with acute im ream metals standards shall only be evaluated using an average of two or more samples collected' within one hour. Compliance with ch ­
this - dissolved ORP - Oxidation -Reduction Potential instream metals standards shall only be evaluated using an average of a minimum of four samples taken on consecutive days, or as a 96 -hour average,
DO - Dissolved oxygen S.U. - Standard Unit (f) Metals criteria shall be used for proactive environmental management. An instream exntedence of the numeric criterion for metals shall not be considered to have mused an
gal/min - gallons per minute Spec Cond - Specific Conductance adverse impact to the instream aquatic community without biological confirmation and a comparison of all available monitoring data and applicable water quality standards. This
J- - Estimated concentration, biased low. T - Total weight of evidence evaluation shall take into account data quality and the overall confidence in how representative Ne sampling a of conditions in the waterbody segment
J - Laboratory estimated concentration. Temp - Temperature before an assessment of aquatic lire use attainment, or non -attainment, shall be made by the Division. Recognizing the syneryaric and antagonistic mmplaXIbes of other water
J+ - Estimated concentration, biased high. U - Results not detected at concentrations which equal the laboratory's method reporting limit. quality variables on the actual toxicity of metals, with the exception of mercury and selenium, biological monimrmg will be used to validate, by direct measurement, whether
mg/L - Milligrams per liter ug/L - Micrograms per liter or not the aquatic life use a supported,
mV - Millivolts umhos/cm - Micro mhos per centimeter
I- Hardness dependant metals standards for cadmium, chromium (111). wooer, nickel, and zinc have been calculated for the range of nstream hardness values at Outfall 101 and 102 at the MSS (60.9 mq/L - 475 ma/LI. Per ISA NCAC 02B .0211 (111(6fil a maximum applicable hardness of 400 malL was used to calculate the upoer ranoe.
2- Chromium results represent total chromium. The calculated standard is epecifc to chromium fill).
3 - Total Hardness values for surface water (SW) locations were calclulated using calcium and magnesium tractions (Ref: hUp://www.water.nm,.edu/watemhedss/info/hardness.htmi, accessed on July 12, 2016)
4 - Duke Energy, Standard Operating procedure For Seep Sampling, Rev 0, 3/24/2016 (ADMP-ENV-EHS-00002)
5 - Results obtained at SW -10 may represent a disproportionate level of wastewater and is not considered a valid surface water sampling location. Due to the proximity to the ash basin discharge, mixing and assimilation would not be expected to have occurred at this location.
FIELD PARAMETERS
Comparative Values
Analytical Parameter
y
pH
ORP
DO
Spec
Cond
Turbidity
Temp
Flow
Arsenic
Arsenic
(dis)
Barium
Beryllium
y
(di.)
Cadmium
(dis)
Chloride
Chromium
(dis)
Co Peer
(dis)
Fluoride Lead (dis)
Mercury
Nickel
Nickel
(dis)
Nitrogen,
(N0
+ NO3)
Oil and
Grease
Selenium
Sulfate
Total
Dissolved
Solids
Total
Suspended
Solids
Total Hardness'
(Ca + Mg)
Zinc
(dis)
15A NCAC 02B (Class
B, Water Supply) 6.0-9.0-
NE
5.0
NE
25
NE
NE
10
150*
1
6.5*
0.32-1.35'
250*
49-231'
5.8-29'
I.S. 0.54*
0.012*
25
34-168'
10
NE
S*
250
500
NE
100
78-382'
NPDES Discharge
Limitations
(Daily Maximum)
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
-- --
--
--
--
--
20 a
--
--
--
1001
--
--
Reporting Units
S.U.
my
mg/L
umhos/cm
NTU
Deg C
gal/min
ug/L
ug/L
mg/L
ug/L
ug/L
mg/L
ug/L
ug/L
mg/L ug/L
ug/L
ug/L
ug/L
mg/L
mg/L
ug/L
mg/L
mg/L
mg/L
mg/L (CaCO3)
ug/L
Fraction
N
N
N
N
N
N
N
T
D
T
D
D
N
D
D
N D
T
T
D
N
N
T
N
N
N
T
D
Location ID
Sample
Collection Date
Collected
Under SOP 4
SURFACE WATER ANALYTICAL RESULTS
7/20/2015
NA
6.2
-3
1.4
680
7.8
21
--
0.473
0.54
0.140
< 0.2 U
< 0.08 U
81.6
0.43
< 1 UJ
-- 0.047 J
0.0004391
2.9
3
< 0.02 U
--
0.383
129
466
12.3
234
< IOU
10/1/2015
NA
6.4
-37
1.5
827
6.0
19
--
0.261
0.293
0.110
< 0.2 U
0.0413
7.90
0.353
0.383
-- < 0.1 U
< 0.2 U
12.7
12.8
0.025
--
1.8
3763+
674
7.80
364
8.53
SW -6
4/11/2016
NA6.5
69
4.77
428
9.5
19
--
0.18
0.13
0.106
0.0263
< 0.08 U
48.1
0.463+
1.8
-- < 0.1 U
0.000618
2.2
2.2
< 0.02 U
--
1.1
99.9
246
5.70
160
5.31
6/24/2016
NA
--
--
--
--
--
--
--
0.43
0.35
0.109
0.0263
< 0.08 U
56.8
0.51
0.22 J
-- < 0.1 U
0.00101
4.83
2.6
< 0.02 U
--
< 5 U
114
358
9.60
195
2.7 J
9/16/2016
NA
6.7
-120
3.4
87
8.3
29
--
0.58
0.47
0.035
0.0143+
< 0.08 U
11.0
0.223
0.84
-- 0.0913
0.00154
< 0.5 U
< 0.5 U
0.038
--
< 0.5 U
8.00
58.0
12.0
28.4
< 10 U
3/17/2017
NA
6.6
-36
5.6
516
5.4
11
--
0.203
0.16
0.105
< 0.10 U
0.057 J
67.1
1.2 J
< 0.50 U
-- < 0.10 U
0.0004983
2.4
2.7
0.042
--
1.3
149
365
4.70
187
2.73
10/21/2015
NA
--
--
--
--
--
--
--
0.441
0.43
0.014
< 0.2 U
< 0.08 U
6.90
0.291
1.63+
-- 0.25
0.000665 J+
0.243
0.283
0.18
--
< 0.5 U
4.00
59.0
< 2.5 U
19.9
< IOU
4/11/2016
NA
6.7
334
6.4
120
10.5
19
--
0.23
0.17
0.041
0,0253
0.081
12.8
0.373+
2.1
-- < 0.1 U
0.0066
< 0.5 U
0.86
0.29
--
1.2
5.10
55.0
5.40
28.5
7 3
SW -9
6/24/2016
NA
--
--
--
--
--
--
--
0.43
0.34
0.030
< 0.1 U
< 0.08 U
16.4
0.343
1.2
-- < 0.1 U
0.001951
0.72
0.83
0.20
--
< 0.5 U
11.1
77.0
< 3.3 U
38.4
3.33
12/6/2016
NA
7.0
81
6.04
84
6.3
17
--
0.45
0.29
0.028
0.0313
< 0.08 U
11.8
0.373
1.3
-- < 0.1 U
0.00106
< 0.5 U
0.51
0.15
--
< 0.5 U
5.20
56.0
3.20
23.9
4.13
3/17/2017
NA
7.6
-79
5.5
124
12.5
14
--
0.47
0.33
0.039
0.075 J
0.0723
15.3
0.38)
0.98
-- < 0.10 U
0.0082
0.69
1.1
0.24
--
0.37 J
5.40
67.0
13.3
31.2
8.41
10/21/2015
NA
--
--
--
--
--
--
--
0.493
0.56
0.013
< 0.2 U
0.16
7.80
0.421
9.2
-- 0.8
0.0006683+
0.57
1
0.18
--
< 0.5 U
4.40
61.0
< 2.5 U
20.7
6.73
4/11/2016
NA
6.7
211
7.9
758
7.1
18
--
2.6
1.2
0.048
< 1 U
< 0.8 U
170
< 5 U
< 5 U
-- < 1 U
0.00227
6.3
7.6
0.37
--
5.7
99.4
420
2.60
281
8.61
s
6/24/2016
NA
--
--
--
--
--
--
--
2.6
1.2
0.045
0.0841
< 0.08 U
88.3
0.39 J
1.6
-- < 0.1 U
0.000852
4.1
4
0.20
--
0.85
57.9
296
3.20
200
8.33
SW -10
9/16/2016
NA
6.7
194
4.5
1193
8.2
30
--
10.1
4.2
0.085
0.042 J+
< 0.08 U
272
0.143
1.1
-- < 0.1 U
0.00293
3.6
3
0.19
--
2.5
96.3
788
14.3
479
3.1 J
12/6/2016
NA
6.8
82
6.5
125
8.3
13
--
0.52
0.41
0.015
< 0.1 U
< 0.08 U
14.3
< 0.5 U
0.95
-- < 0.1 U
0.000583
0.47 J
0.57
0.15
--
< 0.5 U
7.30
55.0
3.50
30.7
3.13
3/16/2017
NA
7.4
41
5.8
128
7.2
14
--
0.38
0.28
0.015
< 0.10 U
< 0.080 U
14.5
0.281
1.3
-- < 0.10 U
0.00149
0.58
0.70
0.23
--
< 0.50 U
6.80
54.0
< 2.5 U
30.1
< 10.0-U
10/21/2015
NA
--
--
--
--
--
--
--
0.421
0.421
0.014
< 0.2 U
< 0.08 U
8.10
0.263
2.9 J+
-- 0.23
0.0008623+
0.323
0.26 J
0.18
--
< 0.5 U
4.60
56.01
< 2.5 U
22.2
11
4/11/2016
NA
6.8
261
8.1
- 88
7.1
18
--
0.2
0.13
0.018
< 0.1 U
< 0.08 U
5.50
0.33+
0.93
-- < 0.1 U
0.0008
< 0.5 U
0.52
0.29
--
< 0.5 U
4.00
< 25.0 U
< 2.5 U
18.5
< 10 U
SW 11
6/24/2016
NA
6.7
356
3.87
168
4.2
24
--
0.76
0.49
0.024
< 0.1 U
< 0.08 U
23.8
0.223
1.2
-- < 0.1 U
0.000518
1.3
1.2
0.24
--
< 0.5 U
14.9
80.0
< 2.5 U
54.7
< 10 U
9/16/2016
NA
6.7
190
4.1
81
7.0
29
--
0.68 1
0.51
0.022
< 0.1 U
< 0.08 U
6.40
0.0973
1.5
-- < 0.1 U
0.000804 J+
< 0.5 U
< 0.5 U
0.12
--
< 0.5 U
2.70
34.0
4.00
19.2
< 10 U
12/6/2016
NA
7.1
86
M
77
4.7
13
--
0.44
0.33
0.014
< 0.1 U
1 < 0.08 U
8.40
0.123
1.1
-- < 0.1 U
0.000483 J
< 0.5 U
0.78
0.14
--
< 0.5 U
4.50
35.0
4.50
20.2
2.83
3/16/2017
NA
7.3
33
5.7
77
7.4
13
--
0.32
0.27
0.015
< 0.10 U
< 0.080 U
9.10
7.8
1.5
-- < 0.10 U
0.0005
< 0.50 U
0.56
0.18
--
< 0.50 U
4.40
< 25.0 U
< 2.5 U
20.5
3.03
Notes:
- - Bold and highlighted results Indicate value equal to or greater than current respective standard or critena [15A NCAC 028(Class B, WS -N), NPDES permit value]. Values for I5A NCAC 028, Class B, WS -W effective January 1, 2015.
< -rcentration not detected at or above Me adjusted reporting limit.
-- . Not Analyzed N - Normal *Value is the current 15A NCAC 02B Surface Water Quality Standard for Freshwater Aquatic Life
D - Dissolved NE - Not Established NA - Not Applicable Note the following from 15A NCAC 028 .0211 (11) Amended Eff. January 1, 2015:
Deg C - Degrees Celsius NTU - Nephelometric turbidity unit (e) Compliance with acute im ream metals standards shall only be evaluated using an average of two or more samples collected' within one hour. Compliance with ch ­
this - dissolved ORP - Oxidation -Reduction Potential instream metals standards shall only be evaluated using an average of a minimum of four samples taken on consecutive days, or as a 96 -hour average,
DO - Dissolved oxygen S.U. - Standard Unit (f) Metals criteria shall be used for proactive environmental management. An instream exntedence of the numeric criterion for metals shall not be considered to have mused an
gal/min - gallons per minute Spec Cond - Specific Conductance adverse impact to the instream aquatic community without biological confirmation and a comparison of all available monitoring data and applicable water quality standards. This
J- - Estimated concentration, biased low. T - Total weight of evidence evaluation shall take into account data quality and the overall confidence in how representative Ne sampling a of conditions in the waterbody segment
J - Laboratory estimated concentration. Temp - Temperature before an assessment of aquatic lire use attainment, or non -attainment, shall be made by the Division. Recognizing the syneryaric and antagonistic mmplaXIbes of other water
J+ - Estimated concentration, biased high. U - Results not detected at concentrations which equal the laboratory's method reporting limit. quality variables on the actual toxicity of metals, with the exception of mercury and selenium, biological monimrmg will be used to validate, by direct measurement, whether
mg/L - Milligrams per liter ug/L - Micrograms per liter or not the aquatic life use a supported,
mV - Millivolts umhos/cm - Micro mhos per centimeter
I- Hardness dependant metals standards for cadmium, chromium (111). wooer, nickel, and zinc have been calculated for the range of nstream hardness values at Outfall 101 and 102 at the MSS (60.9 mq/L - 475 ma/LI. Per ISA NCAC 02B .0211 (111(6fil a maximum applicable hardness of 400 malL was used to calculate the upoer ranoe.
2- Chromium results represent total chromium. The calculated standard is epecifc to chromium fill).
3 - Total Hardness values for surface water (SW) locations were calclulated using calcium and magnesium tractions (Ref: hUp://www.water.nm,.edu/watemhedss/info/hardness.htmi, accessed on July 12, 2016)
4 - Duke Energy, Standard Operating procedure For Seep Sampling, Rev 0, 3/24/2016 (ADMP-ENV-EHS-00002)
5 - Results obtained at SW -10 may represent a disproportionate level of wastewater and is not considered a valid surface water sampling location. Due to the proximity to the ash basin discharge, mixing and assimilation would not be expected to have occurred at this location.

TABLE 3-1
SURFACE WATER AND OUTFALL ANALYTICAL RESULTS
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Page 3 of 6
OTHER PARAMETERS
Analytical Parameter
Aluminum
Aluminum
(dis)
Antimony
Antimony
(dis)
Alkalinity
Barium
(dis)
Beryllium
Bicarbonate
Alkalinity
Boron
Boron
(dis)
Cadmium
Carbonate
Alkalinity
Calcium
Calcium
(dis)
)
Chromium
Chromium
(VI)
Cobalt
Cobalt
(dis)
Copper
Iron
Iron
(dis)
)
15A NCAC 02B (Class
B, Water Supply)
NE
NE
NE
NE
NE
NE
NE
HE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Reporting Units
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
Fraction
T
D
T
D
N
D
T
N
T
D
T
N
T
D
T
T
T
D
T
T
D
Location ID
Sample
Collection Date
Collected
Under SOP'
BACKGROUND SURFACE WATER ANALYTICAL
RESULTS
10/1/2015
NA
560
< 100 U
< 0.5 U
< 0.5 U
19400 J-
40
< 0.2 U
19400
< 50 U
< 50 U
< 0.08 U
< 5000 U
4490
--
0.64
--
0.353
0.283
0.8 J+
1100
270
4/11/2016
NA
304
< 100 U
< 0.5 U
< 0.5 U
22600
29.1
0.051+
22600
< 50 U
< 50 U
< 0.08 U
< 5000 U
4230
--
0.4 J+
--
0.21
0.11
0.243
570
96
6/24/2016
NA
264
< 100 U
< 0.5 U
< 0.5 U
27700
35.9
0.0323
27700
< 50 U
< 50 U
< 0.08 U
< 5000 U
4340
--
0.61
--
0.32
0.2
0.31
823
170
SW -7
9/16/2016
NA
82.61
< 100 U
< 0.5 U
< 0.5 U
28100
37.7
0.0253
28100
< 50 U
< 50 U
< 0.08 U
< 5000 U
4470
--
0.25 J
0.016)
0.35
0.32
0.21
925
356
12/6/2016
NA
945
325
< 0.5 U
< 0.5 U
16800
28.2
0.1
16800
< 50 U
< 50 U
< 0.08 U
< 5000 U
2830
--
0.74
0.42
0.26
1.5
1700
555
3/17/2017
NA
148
< 100 U
< 0.50 U
< 0.50 U
25600
29.0
0.0173
25600
< 50.0 U
< 50.0 U
< 0.080 U
< 5000 U
3780
--
0.45 ]
1.1
0.12
0.0681
< 0.50 U
353
46.2 J
10/1/2015
NA
240
< 100 U
< 0.5 U
< 0.5 U
29800 J-
57
< 0.2 U
29800
520
530
< 0.08 U
< 5000 U
11600
--
0.8
--
3.5
3.2
0.947+
4100
2100
4/11/2016
NA
< 100 U
< 100 U
< 0.5 U
< 0.5 U
23700
28.1
0.029 )+
23700
< 50 U
< 50 U
< 0.08 U
< 5000 U
4840
--
0.32 )+
--
1.5
1.4
0.253
683
246
SW
6/23/2016
NA
< 100 U
< 100 U
< 0.5 U
< 0.5 U
26700
30.6
0.055 J
26700
< 50 U
< 50 U
< 0.08 U
< 5000 U
5190
--
0.52
--
1.1
0.75
0.323
1270
138
-8
9/16/2016
NA
< 100 U
< 100 U
< 0.5 U
< 0.5 U
25900
37.6
0.029 1
25900
30.33
28.2 J
< 0.08 U
< 5000 U
4730
--
0.62 J+
0.087
0.62
0.65
0.19 J
1260
794
12/6/2016
NA
230
66.81
< 0.5 U
< 0.5 U
22500
31.5
0.0411
22500
< 50 U
< 50 U
< 0.08 U
< 5000 U
3930
--
0.4 )
0.64
0.5
1.1
1520
725
3/17/2017
NA
192
< 100 U
< 0.50 U
< 0.50 U
26100
26.8
0.018 J
26100
< 50.0 U
< 50.0 U
< 0.080 U
< 5000 U
4210
--
0.723
1.4
0.69
0.43
< 0.50 U
1190
173
Location ID
Sample
Collection Date
Collected
Under SOP •
OUTFALL
ANALYTICAL
RESULTS
9/4/2014
No
--
--
--
--
--
--
--
--
--
--
<1
--
--
--
1.47
--
--
--
<1
4410
--
4/22/2015
No
--
--
--
--
--
--
--
--
--
--
<1
--
--
--
4.45
--
--
--
<1
2140
--
10/22/2015
No
--
--
--
--
--
__
__
__
__
__
<1
--
--
--
2.51
__
__
--
<1
14000--
11/23/2015
No
--
--
--
--
--
--
--
--
--
Outfall 101
5/27/2016
Yes
--
--
--
--
--
--
--
--
--
--
<1
--
--
--
1.42
--
--
--
<1
2760
--
11/7/2016
Yes
--
--
--
--
--
--
--
--
--
<1
--
61400
--
<1
--
--
--
<1
3260
12/9/2016
Yes
24
10
<1
<1
28000
122
<1
28000
1920
1850
<1
<10000
53600
56000
<1
0.35
4.28
4.22
<1
4320
4220
1/9/2017.
Yes
--
--
--
--
--
-
--
-
--
--
<1
--
45300
--
<1
--
--
--
<1
4190
--
2/2/2017
Yes
--
--
--
--
--
--
--
--
--
--
<1
--
33700
--
<1
--
--
--
<1
3490
--
3/6/2017
Yes
--
--
--
--
--
--
--
--
--
--
<1
--
43200
--
<1
--
--
--
<1
3700
--
AOW S-1 upstream
5/9/2016
--
--
-
--
--
--
--
--
--
--
<1
--
--
--
4.14
--
--
--
1.6
7020
--
4/22/2015
No
--
--
--
--
--
--
--
--
--
--
<1
--
--
--
<1
--
--
--
<1
5200
--
7/10/2015
No
__
__
__
__
__
__
__
__
__
__
<1
__
__
__
<1
__
__
__
<1
249
--
7/18/2015
No
--
--
--
--
--
--
--
--
--
--
1.3
--
--
--
85.7
--
--
--
112
--
10/22/2015
No
__
__
__
__
__
__
__
__
__
__
<1
__
__
__
<1
__
__
__
1.1
332
11/23/2015
No
--
--
--
--
--
Outfall 102
5/27/2016
Yes
--
--
--
--
--
-
--
--
--
--
<1
--
--
--
3.15
--
--
--
3.58
12400
--
11/7/2016
Yes
--
--
--
--
<1
--
110000
--
<1
--
--
--
<1
<10
12/9/2016
Yes
53
36
<1
<1
<10000
85
<1
<10000
5520
5510
<1
<10000
113000
114000
<1
<0.25
71.5
73.5
<1
23
19
1/9/2017
Yes
--
--
--
--
--
--
--
--
--
--
<1
--
69000
--
<1
--
--
--
1.06
100
--
2/2/2017
Yes
--
--
--
--
--
--
--
--
--
--
<1
--
100000
--
<1
--
--
--
<1
125
--
3/6/2017
Yes
--
--
--
--
--
--
--
--
--
--
<1
--
107000
--
<1
--
--
--
<1
396
--
Page 3 of 6

TABLE 3-1
SURFACE WATER AND OUTFALL ANALYTICAL RESULTS
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Notes;
- -Bold and highlighted results indicate value equal to or greater
than current respective standard or criteria [15A
NCAC 02B(Clasf B, WS -M, NPDES permit value]. Values far ISA NCAC 028, Class B, WS -W effective January 1, 2015.
<concentration not detected at or above the adjusted reporting limit.
-- - Not Analyzed
N - Normal
*Value is the current ISA NCAC 02B Surface Water Quality Standard for Freshwater Aquatic Life
D - Dissolved
OTHER PARAMETERS
NA - Not Applicable
Deg C - Degrees Celsius
NTU - Nephelometric turbidity unit
chs - dissolved
ORP - Oxidation -Reduction Potential
DO - Dissolved oxygen
S.U. - Standard Unit
Analytical Parameter
Aluminum
Aluminum
(die)
Antimony
Antimony
(die)
Alkalinity
Barium
(di.)
Beryllium
Bicarbonate
Alkalinity
Boron
Boron
(die)
Cadmium
Carbonate
Alkalinity
Calcium
Calcium
(dis)
Chromium
Chromium
(Y1
Cobalt
Cobalt
(di.)
Copper
Iron
Iron
(die)
15A NCAC 028 (Class
B, Water Supply)
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
-/L
Reporting Units
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
Ug
ug/L
u9/L
up/L
ug/L
ug/L
ug/L
up/L
ug/L
Fraction
T
O
T
D
N
D
T
N
T
D
T
N
T
D
T
T
T
D
T
T
D
Location ID
Sample
Collection Date
Collected
Under SOP'
SURFACE WATER ANALYTICAL RESULTS
7/20/2015
NA
-
--
< 0.5 U
< 0.5 U
38400
130
0.0791
38400
2200
2000
0.028)
< 5000 U
54500
0.373
--
4.5
4.7
< 1 U
--
--
10/1/2015
NA
< 100 U
< 100 U
< 0.5 U
< 0.5 U
37400
120
< 0.2 U
37400
3500
3900
0.0523
< 5000 U
74100
0,411
--
24.6
24.9
< I U
2300
2000
4/11/2016
NA
< 100 U
< 100 U
< 0.5 U
< 0.5 U
30000
91.4
< 0.1 U
30000
1280
1100
< 0.08 U
< 5000 U
35200
--
0.51+
--
3.2
3.1
0.423
2940
1930
SW -6
6/24/2016
NA
62.23
< 100 U
< 5 U
< 0.5 U
40400
117
< 1 U
40400
1510
1680
< 0.8 U
< 5000 U
44100
--
< 5 U
--
5.2
4.5
3.13
4710
3480
9/16/2016
NA
234
< 100 U
0.13 J
0.153
16000
26.9
0.0193
16000
132
139
< 0.08 U
< 5000 U
6520
--
0.293
0.0173
0.48
0.26
0.9
954
285
3/17/2017
NA
< 100 U
< 100 U
< 0.50 U
< 0.50 U
32200
107
< 0.10 U
32200
1390
1430
< 0.080 U
< 5000 U
40800
--
0.423
0.53
4.3
3.8
0.473
2950
2630
10/21/2015
NA
773
< 100 U
0.233
0.253
15700 J+
13
< 0.2 U
15700
65
68
< 0.08 U
< 5000 U
4370
--
0.31 J+
--
< 0.5 U
< 0.5 U
0.983
180
303
4/11/2016
NA
418
55.81
< 0.5 U
< 0.5 U
11700
48.7
< 0.1 U
11700
182
172
0.0681
< 5000 U
5320
--
0.433+
--
3.5
4.1
1.1
359
< 50 U
SW -9
6/24/2016
NA
57.53
52.3 J
0.11 J
< 0.5 U
19200
32
0.0313
19200
295
331
< 0.08 U
< 5000 U
8490
--
0.123
--
1.7
1.4
1.1
254
74
12/6/2016
NA
67.43
< 100 U
0.163
0.12 J
14500
28.1
0.0723
14500
143
157
< 0.08 U
< 5000 U
4910
--
0.193
--
1.1
0.82
1.7
213
< 50 U
3/17/2017
NA
413
< 100 U
0.223
0.20 J
14600
36.8
0.17
14600
268
281
0.086
< 5000 U
5900
--
0.451
0.90
8.7
8.2
2.1
428
< 50.0 U
10/21/2015
NA
573
< 100 U
0.23 J
0.43
150003+
12
< 0.2 U
15000
78
90
< 0.08 U
< 5000 U
4480
--
1.13+
--
< 0.5 U
0.211
1.4
180
< 50 U
4/11/2016
NA
204
< 100 U
< 5 U
< 5 U
12000
47.6
0.153+
12000
3950
4340
< 0.8 U
< 5000 U
56900
--
< 5 U
--
2.8
2.9
< 5 U
392
37.93
5
6/24/2016
NA
80.13
< 100 U
0.161
0.143
10600
46.1
0.084 J
10600
2740
2870
< 0.08 U
< 5000 U
44400
--
0.113
--
2.5
2.2
1.3
270
< 50 U
SW -10
9/16/2016
NA
345
68.23
0.393
0.323
19800
88.2
0.13
19800
7220
7770
< 0.08 U
< 5000 U
101000
--
0.361+
0.0193
1.7
1.1
1.6
587
62.5
12/6/2016
NA
< 100 U
< 100 U
0.161
0.143
15100
15
0.0163
15100
271
381
< 0.08 U
< 5000 U
6420
--
0.23
--
0.32
0.3
1.33
161
27.31
3/16/2017
NA
96.03
< 100 U
0.20 J
0.193
14700
16.0
0.0173
14700
234
256
< 0.080 U
< 5000 U
6690
--
0.283
0.049 J
0.45
0.36
1.5 J
167
< 50.0 U
10/21/2015
NA
< 100 U
< 100 U
0.223
0.33
151003+
13
< 0.2 U
15100
95
99
< 0.08 U
< 5000 U
4750
--
0.393+
--
< 0.5 U
< 0.5 U
1
150
263
4/11/2016
NA
171
< 100 U
< 0.5 U
0.1 J
11800
13.9
< 0.1 U
11800
79.2
71.7
< 0.08 U
< 5000 U
4280
--
0.271+
--
0.12
0.074 J
0.95
208
33.21
6/24/2016
NA
70.51
< 100 U
0.123
0.113
14200
24.2
< 0.1 U
14200
613
676
< 0.08 U
< 5000 U
12300
--
0.41 J
--
0.71
0.52
3.9
191
32.2 J
SW -11
9/16/2016
NA
53.23
< 100 U
0.151
0.131
16000
14.9
0.0133
16000
81.6
89.1
< 0.08 U
< 5000 U
4250
--
0.243+
0.023
0.15
0.0653
1.6
255
< 50 U
12/6/2016
NA
< 100 U
< 100 U
0.15 J
0.143
15000
13.1
< 0.1 U
15000
106
130
< 0.08 U
< 5000 U
4340
--
0.21 3
--
0.15
0.0563
1.3 J
148
< 50 U
3/16/2017
NA
84.11
< 100 U
0,181
0.193
15200
15.1
< 0.10 U
15200
108
115
< 0.080 U
< 5000 U
4560
--
1.51
0.060)
0.0983
0.093 3
1.6) 1
168
49.31
Notes;
- -Bold and highlighted results indicate value equal to or greater
than current respective standard or criteria [15A
NCAC 02B(Clasf B, WS -M, NPDES permit value]. Values far ISA NCAC 028, Class B, WS -W effective January 1, 2015.
<concentration not detected at or above the adjusted reporting limit.
-- - Not Analyzed
N - Normal
*Value is the current ISA NCAC 02B Surface Water Quality Standard for Freshwater Aquatic Life
D - Dissolved
NE - Not Established
NA - Not Applicable
Deg C - Degrees Celsius
NTU - Nephelometric turbidity unit
chs - dissolved
ORP - Oxidation -Reduction Potential
DO - Dissolved oxygen
S.U. - Standard Unit
gal/min - gallons per minute
Spec Cond - Specific Conductance
J- - Estimated concentration, biased low.
T - Total
3 - Laboratory estimated concentration.
Temp - Temperature
J+ - Estimated concentration, biased high.
U - Results not detected at concentrations
which equal the laboratory's method reporting limit.
mg/L - Milligrams per liter
ug/L - Micrograms per liter
mV - MillivoRs
umhos/cm - Micro mhos per centimeter
Note the following from ISA NCAC 02B .0211 (11) Amended Eff. January 1, 2015:
(e) Compliance with acure-mea , metals standards shall only be evaluated using an average of two or more samples collected within ort hour. Compliance with chronic
instream meta standards shall only be evaluated using an average of a minimum of four samples taken on consecutive days, or ds a 96 -hour average;
(n Meta criteria shat/ be used for proactive environmental management. An instmam exceedence of the numeric -hon for metab Shall not be mnsMered to have caused an
adverse impact to the inst,eann aquatic community without b,olog-1 confirmation and a compamcv, of all available monitoring data and applicable water quality standards. This
weight of evidence evaluation shall take into account data quality and the overall confidence in how representative the sampling a of conchrions n the waterbody segment
before an assessment of aquatic life use attainment, or non -attainment, shall be made by the Dlvisron. Recognizing the sy-gi,s is and antagonatic complexities of other water
quality variables on the actual toxicity of metals, with the exceprkm of mercury and selenium, bmiogical monitoring will be used to val oste, by direct measurement, whether
or not the aquatic lit use is supported;
1- Hardness deoendant metals standards for cadmium, chromium (III), cooper. nickel. and zinc have been calculated for the range of ,man am hardness values at Outfall 101 and 102 at the MSS f60.9 moll- - 475 mq/L). Per 15A NCAC 028 .0211 f11)(c)(il a maximum applicable hardness of 400 mo/L was used to calculate the wooer z-
2- Chromium results represent toll chromium. The calculated Standard is specific to chromium (III).
3 - Total Hardness values for surface water (SW) locations were calclulated using calcium and magnesium fractions (Rel http://www'.coater.ncsu.edu/watemhedss/info/hardne$S.htMi, accessed on July 12, 2016)
4 - Duke Energy, Standard Operating Procedure For Seep Sampling, Rev 0, 3/24/2016 (ADMP-ENV-EHS-00002)
5 - Results obtained at SW -10 may represent a disproportionate level of wastewater and is not considered a valid surface water sampling location. Due to the proximity to the ash basin discharge, mixing and assimilation could not be expected to have occurred at this location.
Page 4 of 6

TABLE 3-1
SURFACE WATER AND OUTFALL ANALYTICAL RESULTS
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Page 5 of 6
OTHER PARAMETERS
Analytical Parameter
Lead
Lead
(dis)
Magnesium
Magnesium
(dis)
Manganese
Manganese
(dis)
Methane
Mercury
(dis)
Molybdenum
Molybdenum
(dis)
Potascium
Potassium (dis)
Selenium
(dis)
Sodium
Sodium
(dis)
Strontium
Strontium
(dis
Sulfide
Thallium
Thallium
(dis)
Total
Organic
Carbon
Vanadium
Vanadium
(dis)
Zinc
SSA NCAC O2B (Class
B, Water Supply)
NE
HE
HE
HE
NE
HE
HE
NE
HE
HE
NE HE
NE
HE
HE
NE
NE
HE
NE
HE
HE
NE
NE
HE
Reporting Units
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
u9/L
ug/L
u9/L
u9/L u9/L
ug/L
u9/L
ug/L
ug/L
ug/L
u9/L
u9/L
u9/L
ug/L
u9/L
ug/L
ug/L
Fraction
T
D
T
D
T
D
N
D
T
D
T D
D
1 T
D
T
D
N
T
D
N
T
D
T
Location ID
Sample
Collection Date
Collected
Under SOP
BACKGROUND SURFACE WATER ANALYTICAL RESULTS
10/1/2015
NA
0.58
--
1260
--
57
52
24.2
< 0.2 U
< 0.5 U
< 0.5 U
< 5000 U --
< 0.5 U
7040
--
58
55
< 100 U
0.0233
< 0.1 U
2600
2.2
1.2
< 10 U
4/11/2016
NA
0.3
--
1010
--
28.3
16.9
5.13+
--
0.143
0.131
< 5000 U --
< 0.5 U
5930
--
54.6
46.8
< 100 U
< 0.1 U
< 0.1 U
--
1.1
0.46
< 10 U
6/24/2016
NA
0.33
--
1120
--
41.3
36.2
11.3
--
0.19 J
0.16 J
< 5000 U --
< 0.5 U
6510
--
59.4
61.1
< 100 U
0.018 J
< 0.1 U
--
1.5
0.64
< 10 U
SW -7
9/16/2016
NA
0.14
--
1140
--
54.7
51.7
22.8
--
0.16 J
0.15 J
< 5000 U --
< 0.5 U
6970
--
61.4
59.5
< 100 U
< 0.1 U
< 0.1 U
--
1.3 J.
0.69
< 10 U
12/6/2016
NA
0.93
--
859
--
53.8
42.1
< IOU
--
0.11 J
< 0.5 U
< 5000 U --
< 0.5 U
40501
--
34.3
36.9
< 100 U
< 0.1 U
0.026 J
3.2
1.1
< 10 U
3/17/2017
NA
0.20
--
1020
--
13.13
10.4
< 10.0 U
--
0.173
0.151
< 5000 U --
0.34 J
6550
--
51.3
49.0
< 100 U
< 0.10 U
< 0.10 U
7401
1.2
0.53
8.23
10/1/2015
NA
0.36
--
4890
--
270
260
159
< 0.2 U
0.26 J
0.151
41703 --
0.433
8690
--
130
120
< 100 U
0.12
0.12
5200
1.9
0.661
5.53
4/11/2016
NA
< 0.1 U
--
1490
--
123
105
4.9 J+
--
< 0.5 U
< 0.5 U
< 5000 U --
< 0.5 U
5620
--
41.5
36.2
< 100 U
< 0.1 U
< 0.1 U
--
0.31
0.15)
< IOU
6/23/2016
NA
0.093 J
--
1680
--
105
81
1 < 10 U
--
0.161
0.143
< 5000 U --
< 0.5 U
6380
--
44.4
44.2
< 100 U
< 0.1 U
< 0.1 U
--
0.59
0.243
2.63
SW -8
9/16/2016
NA
< 0.1 U
--
1400
--
63.9
75.9
80
--
0.33
0.361
< 5000 U --
< 0.5 U
5970
--
49.3
52.2
< 100 U
< 0.1 U
< 0.1 U
--
2.4
1.8
< IOU
12/6/2016
NA
0.32
--
1480
--
80.8
77.4
37
0.153
0.133
< 5000 U --
< 0.5 U
4640J
--
35.9
38.2
< 100 U
< 0.1 U
< 0.1 U
1.5
0.43
< IOU
3/17/2017
NA
0.28
--
1470
--
64.1
55.0
23.9
< 0.50 U
0.12 J
< 5000 U --
0.481
6110
--
43.2
39.2
< 100 U
< 0.10 U
< 0.10 U
1300
1.6
0.52
< 10.0 U
Location ID
Sample
Collection Date
Collected
Under SOP •
OUTFALL ANALYTICAL RESULTS
9/4/2014
No
<1
__
__
__
__
__
__
__
__
__
__ __
__
__
_
<5
4/22/2015
No
<1
__
__
__
__
__
__
__
__
__
__ __
__
__
__
__
__
__
__
__
__
__
__
<5
10/22/2015
No
<1
_
__
__
__
__
__
__
__
__
__ __
__
__
__
__
__
__
__
__
_.
__
__
7
11/23/2015
No
--
--
--
--
--
- _
__
__
__
__
__ __
__
__
_
__
_
__
__
--
--
--
Outfall 101
5/27/2016
Yes
<1
--
--
--
--
-
--
<
11/7/2016
Yes
<1
--
28400
--
829
--
--
--
--
--
--
12/9/2016
Yes
<1
<1
26000
28000
842
897
--
--
<1
<1
3510 3750
<1
2550
2610
1550
1490
<100
<0.2
<0.2
1600
<0.3
<0.3
<5
1/9/2017
Yes
<1
--
23200
--
682
--
--
--
--
--
-- --
--
--
--
-
--
--
--
--
--
--
--
<5
2/2/2017
Yes
<1
--
16600
--
575
--
--
--
--
--
3/6/2017
Yes
<1
--
22600
--
679
--
--
--
--
--
AOW S-1 upstream
5/9/2016
<1
_
__
__
-_
__
__
__
__
__
__ __
__
_
6
4/22/2015
No
<1
__
_
__
__
__
__
__
__
__
__ __
__
__
__
_
__
__
__
__
__
__
__
<5
7/10/2015
No
<1_
__
__
__
__
__
__
__
__
__ __
__
__
__
__
__
__
__
__
__
__
__
16
7/18/2015
No
227
__
__
__
__
__
__
__
__
__
__ __
__
__
__
__
__
__
__
__
__
__
_.
240
10/22/2015
No
<1
--
--
--
--
-
--20
11/23/2015
No
--
--
--
--
-
__
__
__
__
__
__ __
__
__
__
__
__
__
__
__
--
--
--
Outfall 102
5/27/2016
Yes
2.98
--
_ __
__
__
__
__
__
__
__
__
__13
--
--
11/7/2016
Yes
<1
--
45900
--
7470
--
--
--
--
--
--
12/9/2016
Yes
<1
<1
46900
48900
7570
7860
--
--
<1
<1
6100 6330
<1
8590
8540
747
696
<100
0.574
0.517
491
<0.3
<0.3
19
1/9/2017
Yes
<1
--
27600
--
4300
--
--
--
--
--
--
2/2/2017
Yes
<1
--
44400
--
7560
--
--
--
--
--
--17
3/6/2017
Yes
<1
--
47300
--
7880
--
--
--
--
--
-- --
Page 5 of 6

TABLE 3-1
SURFACE WATER AND OUTFALL ANALYTICAL RESULTS
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Fe9< 1 a 4
FIELD PARAMETERS
Comparative Values
Analytical Parameter
pH
ORP
DO
Spec
Co1M
Tur6idiry
Tamp
Flaw
Anemic
llraanlc
(tlis)
Nrium
Beryllium
(die)
Cadmium
(die)
Chloride
CM1romiumr
(di.)
Ce
Copper
(die)
Fluoride lwtl (die)
Mercury
Ni<kal
Nickel
leis)
Nitrogen,
(NO,
+Nor)
Oil and
Grease
Sel°nmm
Sulfate
Total
Dissolved
Solids
Total
Suspended
5oliaF
Total Hardness'
(Ca+Mg)
iinc
(the)
I5A MGC 02B (Class B, Water Supply) 6.0-9.0*
NE
5.0
NE
25
NE
NE
10
Me
1
6.5-
0.32-1.35'
250-
49-331
5.8-29
1.8e
0.56•
0.012-
23
34-168 t
10
NE
Se
250
am
ME
100
28-362'
NPDES arpe Limitations
(Daily Maximum)--
--
-
--
--
-
._
__
__
_.
-_
__
_.
20
--
-.
-.
100'
Repertin9Units
S.U.
mV
mg/L
umM1q/On
HIM
Deal,
gal/min
ng/L
u0/L
mg/L
ug/L
ug/L
m0/L
ug/L
ug/L
mg/L
u9/L
u9/L
ug/L
ug/L
m9/L
m9/l
u0/L
mg/l
m9/L
m0/L
mg/L (CaCO3)
ug/L
Fraction
N
N
N
N
N
N
N
T
D
T
D
D
N
0
D
N
D
T
T
D
N
N
T
N
N
N
T
D
Leution 10
Semple
Callection Date
C011estad
Undax SOP'
BACKGROUND SURFACE WATER ANALYTICAL RESULTS
10/1/2015
NA
6.6
22
5.62
70
26.4
18
--
0.273
0.181
0.044
< 0.2 U
< 0.06 U
3.00
052
0.33)
-
< 0.1 U
< 0.2 U
0.221
0.211
0.0981-
--
< 0.5 U
2.50
84.0
12.9
16.4
< 10 U
4/11/2016
NA
2.2
258
7.11
83
8.1
12
--
0.12
0.0281
0.036
< 0.1 U
< 0.08 U
2.00
0.6a 3+
0.51
--
< 0.1 U
0.00166
< 0.5 U
< 0.5 U
0.14
--
0.461
0.911
< 25.0 U
9.00
14.2
< le U
6/24/2016
NA
7.0
161
6.5
91
12.2
20
--
0.22
0.12
0.037
< 0.1 U
< 0.08 U
1.90
0.65
1.4
-
< 0.1 U
0.00148
< 0.5 U
0.56
0.18
-
< 0.5 U
0.821
40.0
8.50
15.4
< 10 U
SW 7
9/16/2016
NA
6.4
91
6.3
68
SJ
19
--
0.22
0.18
0.039
0.024 J+
<O.OBU
2.40
0.211
1.2
--
<O.1U
0.00188 J+
<O.SU
<O.SU
0.11
--
<O.SU
-1.000
5/.0
6.00
15.9
3.61
12/6/2016
NA
5.4
91
6.45
50
37.4
IS
-
0.35
0.22
0.030
0.0871
< 0.08 U
2.30
0.29 J
0.96
--
0.32
0.00514
< 0.5 U
< 0.5 U
0.052
--
< 0.5 U
1.50
52.0
14.0
10.6
< 10 U
3/1]/201]
NA
6.8
-41
6.6
65
6 2
12
--
0.141
0.057 J
0.029
0.010)
< O.OSO U
2.30
0.241
< 0.50 U
--
< 0.10 U
0.0009951
< 0.50 U
< 0.50 U
0.20
--
0.33 J
0.651
72.0
20.1
13.6
4.23
10/1/2015
NA
6.8
-96
1.12
331
19.3
IB
--
Ll
0.92
0.060
< 0.2 U
< 0.08 U
4.00
0.28 J
0.411
--
0.054 J
< 0.2 U
5
4.6
0.341-
--
0.461
31.7
119
13.0
49.1
2.31
4/11/2016
NA
2.1
125
2.41
69
8.3
--
0.082 J
0.068J
0.032
< 0.1 U
< 0.08 U
3.00
0.211
0.94
--
< 0.1 U
0.0004161
< 0.5 U
0.64
0.30
--
< 0.5 U
1.50
30.0
< 2.5 U
18.2
< 10U
6/23/2016
NA
7.2
128
5.4
1]4
10.8
--
0.13
O.W31
0.032
< 0.1 U
< 0.08 U
2.60
0.26 3
0.58
--
< 0.1 U
0.00161
< 0.5 U
< 0.5 U
0.46
--
< 0.5 U
0.95)
5680
2.80
19.9
< 10U
SW -e9/16/2016
NA
6.5
54
4.2
68
6.2
d16
--
009 J
0.065J
0.037
0.0111+
< 0.08 U
2.20
0.341
0.291
--
< 0.1 U
0.000526
< 0.5 U
< O.5U
0.82
--
< 0.5 U
< 1.00 U
55.0
2.80
17.6
2.51
12/6/2016
NA
6 7
29
6.9
80
12.4
--
0.14
0.095 3
0.032
0.0181
< 0.08 U
3.10
0.23 3
0.76
--
< 0.1 U
0.00214
< 0.5 U
< 0.5 U
0.12
--
< 0.5 U
2.00
62.0
5./0
15.9
2.71
3/12/2012
NA
6.1
-23
7.1
94
6.6
--
0.161
0.0661
0.031
<0,10U
-0.0801
2.70
0.361
<0.50U
--
-0.101
0.001261
<0.50U
0.141
0.39
--
<0.50U
15.1
52.0
<2.SU
16.fi
<lO.OU
Location ID
auntie
which. Date
Co116Red
Unclear 90P'
OUTFALL ANALYTICAL 0.ESUL18
9/4/2014
No
6.6
--
--
>2700
-
--
-
13
--
0.098
--
--
5.10
-
<0.5
<.05
1.93
<5
4.58
290
530
18.0
291
4/22/2015
No
6.3
--
--
164
--
--
<1
-
0070
--
--
2.08
--
--
0.132
--
0.00227
2.66
--
0.016
<5
<1
48.5
130
5.00
60.9
-
10/22/2015
No
6.4
-
-
fiO3
--
--
1.795
<1
--
0.110
--
-
5.70
--
--
0.180
--
0.000871
9.1
--
0.036
--
3.21
2]0
500
110
--
-
11/23/2015
No
--
--
_.
..
_-
_
_
_
__
..
..
..
..
_
_
..
..
0.00139
-
_
--
_Outralll0l
Outfall 101
5/27/2016
Yes
6.3
-
-
901
-
--
17.95
<t
--
0.087
-
-
4.30
--
--
<0.5
-
0.00353
3.41
- -
<O.OI
<5
1.55
89.0
190
also
103
-
11/2/2016
Yes
6.1
-
--
712
4.9
--
10
<t
--
0.146
--
-
100
--
--
<0.2
--
c0005
2.8
--
0.02
<5
<1
140
420
<5.0
244
-
12/9/2016
Yes
6.3
--
--
610
--
--
--
<1
--
0.120
<1
cl
79.0
<1
<1
<0.2
--
c0005
2.52
2.52
<O.Dl
<5
<l
140
410
<5.0
241
-
1/9/10D
Yes
6.6
--
--
535
--
--
15.4
el
--
0.107
--
--
68.0
--
--
<0.2
--
-.0005
2.37
- -
-0.01
<5
1.34
130
350
<5.0
209
-
2/2/2012
year
6.7
--
-
456
--
--
12
<1
--
0.121
--
--
55.0
--
--
<0.2
--
.00028
2.33
-
-0.01
<5
<1
90.0
280
8.00
153
3/6/2012
Yes
6.4
--
--
5845
-
--
12.5
<1
--
0.117
--
--
67.0
-
--
<0.2
--
.000203
2.1
--
<0.01
<5
1.03
120
320
2.00
201
-
AOW 5-1 upstream
5/9/2016
7.2
--
--
192
--
--
0.494
11
--
0.103
--
--
3.00
--
--
0.160
--
0.00568
4.85
--
0.01
--
2.1
62.0
150
16.0
80.1
--
4/22/IO15
NO
5.5
-
--
282
--
--
--
<3
--
0.081
--
--
154
--
--
<0.1
-
0.0021
<1
0.014
<5
<1
115
520
6.00
310
-
7/10/2015
No
5.6
--
--
895
--
--
-
1.74
--
0.107
--
-
230
--
--
0.190
--
0.036
1.43
-
0.096
<5
<1
140
890
31.0
455
--
2/18/2015
No
--
--
--
--
--
--
--
87.1
-
0.990
--
--
202
-
--
--
--
0.074
51
-
--
--
25.1
130
892
20.5
-
-
]0/22/2015
No
6.3
-
--
9)7
--
--
0.449
1.51
--
0.096
--
--
230
--
--
<1.0
-
0.0207
1.37
--
0.s89
-
2.49
130
660
15.0
-
11/23/2015
No
_-
_.
_.
__
_
_
_
_
_
_
..
11.0353
-_
..
_
_
_
..
..
_.
_
..
OuHall 102
5/27/2016
Yes
6.0
-
-
970
--
---
1.3
--
0.110
-
-
2211
<0+5
-
0.000843
2.22
-
-0.01
-
<1
130
680
200
410
11/7/2016
Yes
6.2
-
-
1062
0.6
-
<5
<1
--
0.087
--
-
240
-
--
<0.5
--
0.0103
1.58
-
0.36
<5
<1
130
670
<5.0
464
12/9/2016
Y.
6.6
--
--
1032
--
--
-
<I
-
0.085
<3
<1
230
<I
<1
<0.5
--
0.0123
1.7
1.69
0.32
<5
<1
140
760
<5.0
475
19
1/9/2017
Y.
6.6
--
--
6%
--
--
0.25
1.25
0.055
-
--
iso
--
--
<0.5
-
0.0112
1.67
--
0.27
<5
q
100
440
<5.0
2%
2/2/2017
Ym
6.0
--
--
1023
--
--
0.2
<1
-
0.088
--
--
220
--
--
<0.5
--
0.0122
1.55
--
0.25
<5
<I
140
790
<5.0
433
3/6/2017
Yes
5.1
--
-
1076
--
--
1
1.04
--
0.088
--
--
240
Fe9< 1 a 4

TABLE 3-1
SURFACE WATER AND OUTFALL ANALYTICAL RESULTS
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Notes;
- - Bold and highlighted results indicate value equal to or greater
than current respectwe standard or criteria [15A NCAC 02B(Class B, WS -M. NPDES permit value). Values
for ISA NCAC 028, Class B, WS -IV of ectnre Ianuary 1, 2015.
<ccentration not detected at or above the adjusted reporting limit.
-- - Not Analyzed
OTHER PARAMETERS
-Value is the current 15A NCAC 02B Surface Water Quality Standard for Freshwater Aquatic Life
D - Dissolved
NE - Not Established
NA - Not Applicable
Note the following from 15A NCAC 02B .0211 (Il) Amended ER. lanuary 1, 2015:
Deg C - Degrees Celsius
NTU - Nephelometnc turbidity unit
(e) Compliane with acute instream metals standards shall only be evaluated usvig an average Of two or move samples collected wndim one hour. Compliance wind chronic
pit - dnsolved
ORP - 0,,davon-Reduction potential
Analytical Parameter
Lead
Lead
(dis
Magnesium
Magnesium
dim)
)
Manganese
Manganese
Manganese
(
Methane
Mercury
(dis )
Molybdenum
Molybdenum
dis
( )
Potassium
Potassium
(dis)
Selenium
(di.)
Sodium
Sodium
(dim
Strontium
Strontium
(tlis)
Sulfide
Thallium
Thallium
(dis)
Total
Organic
Carbon
Vanadium
Vanadium
(dis)
Zinc
mV - Millivolts
ISA NCAC 02B (Class
B, Water Supply)
HE
NE
NE
HE
HE
HE
HE
HE
HE
NE
NE
HE
HE
NE
NE
NE
NE
NE
NE
NE
NE
NE
HE
HE
Reporting Units
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
Fraction
T
D
T
D
T
D
N
D
T
D
T
D
D
T
D
T
D
IN
T
D
N
T
D
T
Location ID
Sample
Collection Date
Collected
Under SOP 4
SURFACE WATER ANALYTICAL RESULTS
7/20/2015
NA
0.053 J+
--
23800
--
680
630
126
--
0.14 J
0.1 J
3540 J
--
0.273
27100
1800
1700
< 100 U
0.0373
0.0243
1500
0.463
< 1 U
3.41
10/1/2015
NA
< 0.1 U
--
43400
--
1600
1700
52
< 0.2 U
< 0.5 U
< 0.5 U
5200
--
1.6
38300
1500
1600
c 100 UJ
0.0423
0.04)
13000
< 1 U
< 1 U
5.5)
SW -6
4/11/2016
NA
< 0.1 U
--
17600
--
531
460
32.1
--
< 0.5 U
0.13 J
27103
--
0.8
17900
--
1060
926
< 100 U
< 0.1 U
< 0.1 U
--
0.35
0.45
< IOU
6/24/2016
NA
< 1 U
--
20600
--
589
625
127
--
< 5 U
0.12 J
3180)
--
1.2
22300
--
1190
1300
< 100 U
< 1 U
0.02)
--
1.91
0.4
< IOU
9/16/2016
NA
0.14
--
2950
--
576
346
13.4
--
0.28 J
0.28 J
< 5000 U
--
< 0.5 U
5290
--
139
137
< 100 U
< 0.1 U
< 0.1 U
--
1.2 )+
0.68
< 10 U
3/17/2017
NA
< 0.10 U
--
20800
--
605
624
64.2
< 0.50 U
< 0.50 U
2720 J
--
1.6
20600
--
1300
1250
< 100 U
< 0.10 U
< 0.10 U850
J
0.32 J
0.193
< 10.0 U
10/21/2015
NA
0.0553
--
2190
--
100
34
2 J+
--
0.28 J
0.323
< 5000 U
--
< 0.5 U
4930)
--
28
30
< 100 U
0.0183+
< 0.1 U
1900
0.62 J
0.521
3.21
4/11/2016
NA
0.38
--
3690
--
277
249
3.83+
--
0.12 J
0.17 J
< 5000 U
--
0.91
3980 J
--
52.2
51.9
< 100 U
< 0.1 U
< 0.1 U
--
0.93
0.37
5.81
SW -9
6/24/2016
NA
< 1 U
--
4170
--
456
451
< IOU
--
0.34)
0.31
< 5000 U
--
< 0.5 U
41203
--
86.6
92.4
< 100 U
< 1 U
0.015)
--
0.54
0.26)
2.73
12/6/2016
NA
0.17
--
2830
--
122
101
< IOU
--
0.28)
0.233
< 5000 U
--
< 0.5 U
41103
--
59.1
63.2
< 100 U
0.0491
< 0.1 U
--
0.66
0.143
< 10 U
3/17/2017
NA
0.73
--
3990
--
342
327
< 10.0 U
--
0.29)
0.281
< 5000 U
--
0.59
49303
--
50.7
46.9
< 100 U
0.0693
< 0.10 U
1500
1.2
0.33
9.2 J
10/21/2015
NA
0.055)
--
2310
--
97
47
2.61+
--
0.34 )
0.5
< 5000 U
--
< 0.5 U
5020
--
29
31
< 100 U
0.027 )+
0.19
4200
0.72 )
0.55 )
< IOU
4/11/2016
NA
< 1 U
--
33800
--
681
658
2.11+
--
6.1
6.8
32901
--
< 5 U
6920
--
385
422
< 100 U
< 1 U
< 1 U
--
< 3 U
< 3 U
8.31
s
6/24/2016
NA
< 0.1 U
--
21600
--
828
864
< IOU
--
2.6
2.5
< 5000 U
--
0.89
5590
--
284
292
< 100 U
0.0593
0.1
--
0.65
0.241
5.53
SW -10
9/16/2016
NA
0.31
--
55200
--
870
843
< 10 U
--
8.1
7.5
34603
--
2.5
9040
--
629
650
< 100 U
0.12
0.077)
--
2.5
0.92
43
12/6/2016
NA
0.11
--
3570
--
93.4
87
< IOU
--
0.42)
0.53
< 5000 U
--
< 0.5 U
40003
--
47.8
59.4
< 100 U
< 0.1 U
< 0.1 U
--
0.75
0.3
< 10 U
3/16/2017
NA
0.097)
--
3250
--
92.4
85.8
10.2
--
0.41 )
0.45)
< 5000 U
--
< 0.50 U
4940 J
--
46.7
48.5
< 100 U
< 0.10 U
< 0.10 U
1300
0.793
0.38)
2.81
10/21/2015
NA
< 0.flu
2500
--
93
48
3.11+
--
0.35)
0.36 J
< 5000 U
--
< 0.5 U
4990)
--
30
32
< 100 U
< 0.1 U)
0.026)
2000
0.533
0.46 J
< IOU
4/11/2016
NA
< 0.
1890
--
59.8
39
3.2 J+
--
0.22 J
0.22 J
< 5000 U
--
< 0.5 U
35801
--
30.8
25.4
< 100 U
< 0.1 U
< 0.1 U
--
0.48
0.22 J
< IOU
SW -11
6/24/2016
NA
< 0.
5820
--
510
488
< IOU
--
0.74
0.71
< 5000 U
--
< 0.5 U
39103
--
88.6
91.1
< 100 U
0.031)
0.0273
--
0.39
0.11 )
2.6)
9/16/2016
NA
0.1
2080
--
511
426
< IOU
--
0.393
0.37 J
< 5000 U
--
< 0.5 U
41701
--
34.6
35.2
< 100 U
0.025 J
< 0.1 U
--
0.84
0.33
< IOU
12/6/2016
NA
0.1
2270
--
52.7
17.8
< IOU
--
0.331
0.331
< 5000 U
--
< 0.5 U
3850 ]
--
33.7
37.6
< 100 U
< 0.1 U
< 0.1 U
--
0.79
0.291
9.5 l
3/16/2017
NA
< 0.
2210
--
37.6
29.6
< 10.0 U
--
0.29 J
0.37 J
< 5000 U
--
< 0.50 U
4820 )
--
35.9
36.2
< 100 U
< 0.10 U
< 0.10 U
1500
0.76 ]
0.51 ]
2.63
Notes;
- - Bold and highlighted results indicate value equal to or greater
than current respectwe standard or criteria [15A NCAC 02B(Class B, WS -M. NPDES permit value). Values
for ISA NCAC 028, Class B, WS -IV of ectnre Ianuary 1, 2015.
<ccentration not detected at or above the adjusted reporting limit.
-- - Not Analyzed
N - Normal
-Value is the current 15A NCAC 02B Surface Water Quality Standard for Freshwater Aquatic Life
D - Dissolved
NE - Not Established
NA - Not Applicable
Note the following from 15A NCAC 02B .0211 (Il) Amended ER. lanuary 1, 2015:
Deg C - Degrees Celsius
NTU - Nephelometnc turbidity unit
(e) Compliane with acute instream metals standards shall only be evaluated usvig an average Of two or move samples collected wndim one hour. Compliance wind chronic
pit - dnsolved
ORP - 0,,davon-Reduction potential
instream metals standards shat/ only be evaluated using an average of a minimum of four samples taken oh consecutive days, ov as a 96 -Mur average;
DO - Dissolved oxygen
S.U. - Standard Unit
(f) Metals criteria shall be used for proactive environmental management. A, insm- a -dente of the numerk O hcvr for metals shall not be mnsidered to have caused an
gal/mm - gallons per minute
Spec Conti - Specific Cond,cce-
adverse impact to the ,mumsam aquatk community without biok>gi[a/ confimnation and a comparison of all available monitoring data and applicable water quality standards. This
J- - Estimated concentration, biased low.
T - Total
weight of evidene evaluation shall lake into acibunt data quality and the overall confidence, in Mw representative t/le sampling is of conditions in the waterbody segment
) -Laboratory estimated Concentration.
Temp - Temperature
before an assessment of aquatic life use attainment, or non -attainment, shall be made by the Division. Recognizing the synergisek and antagonistic zimpiexities brother water
J. - Estimated concentration, biased! high.
U - Results not detected at Concentrations which equal the laboratory's method reporting limit.
quality vdnabkts on the actual/ toxicity of metals, with the exception of mercury and selenium, biological mornorrtg will be used to validate, by chrect measurement, whether
mg/L -Milligrams per liter
ug/L - Micrograms per its,
or no/ the aquatic He use S supported;
mV - Millivolts
umhos/cm - Micro mhos per centimeter
1- Hardness dependant metals standards for cadmium, chromium (111), cooper, nickel. and zinc have been calculated for the rarae of instream hardness values at Curial 101 and 102 at the MSS (60.9 mo/L - 475 mo/Ll. Per ISA NCAC 028 .0211 (11)(00) a maximum applicable hardness of 400 nxl/L was used to calculate the under ranoe.
2- Chromium results represent total chromium. The calculated Standard is specific to chromium (111).
3 - Total Hardness values for surface water (SW) locations were caldulated using calcium and magnesium fractions (Ret: hnp://www.water.nou.edu/waterahedss/mfo/haWness.html, accessed on July 12, 2016)
4 - Duke Energy, Standard Operating procedure For Seep Sampling, Rev 0, 3/24/2016 (ADMP-ENV-EHS-0oGD2)
5 - Results attained at SW -10 may represent a disproportionate level of wastewater and is not considered a valid surface water sampling location. Due to the proximity to the ash basin discharge, mixing and assimilation would nat be expected to have occurred at this location.
page 6 of 6

TABLE 3-2
BACKGROUND GROUNDWATER ANALYTICAL RESULTS
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Page 1 of 6
Constituent
pH
ORP
FIELD
DO
PARAMETERS
Spec
Cond
Turbidity
Temp
Alkalinity
Bi
carbonate
Alkalinity
WATER QUALITY PARAMETERS
Total 1
Methane Sulfide Hardness
(Ca and Mg)
Total
Organic
Carbon
Total
Suspended
Solids
SELECTED 40CFR257
Boron Calcium
APPENDIX
Chloride
III CONSTITUENTS + STRONTIUM
Total Dissolved
Strontium Sulfate
Solids
15A
NCAC 02L, IMAC:
6.5-8.5
NE
NE
NE
NE
NE
NE
Ir
NE
NE
NE
NE
NE
NE
700
NE
250000
NE
250000
500000
*PPBCs:
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
100
NE
3500
190
1460
85400
Reporting Units:
SU
mV
m /L
umhos/cm
NTU
De C
u /L
u /L
u /L
u /L
u /L CaCO3
u /L
u /L
u /L
ug /L
u /L
u /L
u /L
u /L
Fraction:
N
N
N
N
N
N
N
N
N
N
T
N
N
T
T
N
T
N
N
Location ID
Sample
Collection Date
Background Groundwater
Analytical Results
4/29/2016
7.1
-15
0.6
205
9.1
27
92400
< 5000 U
92400
< 10 UJ
< 100 U
74943
< 1000 U
13100
< 50 U 1
17700
2100
230
5500
150000
6/23/2016
9.4
-89
0.3
202
8.8
21
124000
18600
106000
< 10 U
< 100 U
71557
40600
< 50 U
17300
2100
298
8400
180000
BG -113R
9116/2016
9.4
154
0.6
273
4.9
19
130000
38600
91700
<-10 U
< 100 U
72770
6800
< 50 U
18000
2400
329
7900
179000
12/5/2016
9.4
-87
0.5
272
2.5
14
131000
24400
107000
< 10 U
310
78250
7000
< 50 U
19700
2200
322
7900
191000
BG-1BRA
3/15/2017
8.3
139
0.7
329
28.2
5
97000
< 5000 U
97000
< 10.0 U
< 100 U
55952
4200
22300
29.0J
15600
11300
198
42700
260000
7/17/2015
6.2
1
2.7
182
8.2
17
63000
< 5000 U
63000
3J
< 100 U
56798
1300
11300
< 50 U
11900
4800
580
11800
142000
9/29/2015
6.2
206
2.1
149
8.4
19
60400
< 5000 U
60400
1.1 1+
< 100 U
56732
17300
< 5000 U
29J+
11000
3000
600
8500
108000
11/11/2015
6.3
137
2.41
313
9.0
16
65800
< 5000 U
65800
1.5 J+
< 100 U
58142
< 1000 U
24300
< 50 U
11400 1
3200
660
11400
126000
12/11/2015
6.3
43
0.42
238
1.1
15
83400
< 5000 U
83400
2.4 J+
< 100 U
61564
2900
< 2600 U
< 50 U
13100
4500
690
24200
146000
BG -1D
3/15/2016
6.3
141
1.4
208
7.7
18
76300
< 5000 U
76300
1.4 J+
< 100 U
60343
5901
< 2500 U
< 50 U
12100
3300
657
13800
123000
6/23/2016
6.2
105
1.6
190
0.3
20
69400
< 5000 U
69400
< IOU
< 100 U
58685
< 2500 U
< 50 U
11700
2700
658
10000
152000
9/15/2016
6.2 1
72
1.8
191
0.9
30
72200
< 5000 U
72200
< 10 U
< 100 U
59017
< 2500 U
< 50 U
11800
3000
665
10100
112000
12/5/2016
6.2
201
2.2
183
0.0
14
72600
< 5000 U
72600
< 10 U
< 100 U
63320
< 2600 U
< 50 U
12600
3100
702
10100
149000
3/15/2017
6.1
152
3.1
172
3.1
8
67800
< 5000 U
67800
< 10.0 U
< 100 U
61580
< 1000 U
< 2500 U
< 50.0 U
12200
3100
732
9700
133000
7/17/2015
6.1
4
3
135
7.7
21
50800
< 5000 U
50800
2.63
< 100 U
58460
15600
83000
< 50 U
7390
3500
210
1100
114000
9/29/2015
6.1
204
3.46
114 1
9.9
20
45500
< 5000 U
45500
9.43+
< 100 U
55539
< 1000 U
4800
261+
6830 1
3500
200
1500
87000
11/11/2015
5.7
236
3.1
95
9.8
16
8800
< 5000 U
8800
1.33+
< 100 U
35674
2300
15300
321
4380
2500
99 1
10600
110000
12/11/2015
5.5
255
2
127
3.8
14
11200
< 5000 U
11200
1.41+
< 100 U
32545
1600
< 2500 U
< 50 U
4050
2200
83
11100
51000
BG -1S
3/15/2016
5.2
284
2.2
90
9.8
22
8200
< 5000 U
8200
1.41+
< 100 U
32315
1400
< 5000 U
< 50 U
3760
1000
76.9
9500
55000
6/24/2016
5.4 1
289
3.6
76
29.1
21
15500
< 5000 U
15500
< 10 U
< 100 U
33349
< 2500 U
80.2
3960
2200
87.6
5100
87000
9/15/2016
5.5
223
1.1
96
6.1
27
15400
< 5000 U
15400
< 10 U
< 100 U
37364
< 2500 U
< 50 U
4480
3500
98.7
8000
49000
12/5/2016
5.5
251
1.6
85
5.5
13
14500
< 5000 U
14500
< 10 U
< 100 U
34845
< 2600 U
< 50 U
4180
3300
90.5
5700
68000
3/15/2017
5.4
255
5
98
50.1
7
11400
< 5000 U
11400
< 10.0 U
< 100 U
38063
1300
4500
31.3] 1
4430
4700
103
10000
77000
7/18/2015
7.0
-45
1.9
223
1 413.7
24
107000
< 5000 U
107000
2.61
< 100 U
125855
1100
180000
< 50 U
32600
3400
360
8200
369000
9/29/2015
6.8
208
3.39
152
10.0
19
816001-
< 5000 U
81600
1.2 J+
< 100 U
68424
< 1000 U
< 2500 U
< 50 U
12600
2400
220
2200
131000
11/11/2015
6.9
157
3.2
183
9.4
16
87700
< 5000 U
87700
1.3 J+
< 100 U
76601
< 1000 U
10000
< 50 U
15100
2600
260
3000
182000
12/11/2015
6.8
157
3.12
204
1.1
16
89800
< 5000 U
89800
1.2 J+
< 100 U
75898
< 1000 U
< 2500 U
< 50 U
15000
2600
240
2700
137000
BG-2BR
3/28/2016
6.9
196
3.8
192
1.3
15
86300
< 5000 U
86300
< 10 U
< 100 U
75772
< 1000 U
< 2500 U
< 50 U
14900
2500
218
2200
153000
6/23/2016
82800
< 5000 U
82800
< 10 U
< 100 U
69000
< 2500U
< 50 U
12600
1900
216
2300
148000
9/15/2016
6.8
71
2.9
183
1.5
22
90900
< 5000 U 1
90900
< 10 U
< 100 U
78264
< 2500 U
< 50 U
14200
2300
241
2300
136000
12/5/2016
6.9
52
3.5
171
1.8
12
89400
< 5000 U
89400
< 10 U
< 100 U
71316
< 2500 U
< 50 U
13000
2200
226
2200
1270003
3/14/2017
7.0
142
3.3
177
1.5
13
90700
< 5000 U
90700
< 10.0 U
< 100 U
74444
< 1000 U
< 5200 U
< 50.0 U
14500
2200
228
2200
138000
7/19/2015
10.9
-21
3.5
388
9.6
24
104000
42900
61200
2.61
< 100 U
167461
8101
4900
< 50 U
60900
2700
340
9100
178000
9/28/2015
7.4
171
2
200
12.0
21
103000 1-
< 5000 U
103000
2.8 J+
< 100 U
99955
< 1000 U
7900
< 50 U
27700
3100
240
8200
174000
11/13/2015
7.2
137
10.3
187
8.9
19
78300
< 5000 U
78300
1.2 J+
< 100 U
76194
730 J
5500
< 50 U
22800
2200
170
9500
147000
12/11/2015
6.6
156
3.29
184
7.9
17
77900
< 5000 U
77900
2.11+
< 100 U
66947
6501
< 2500 U
< 50 U
17300
2300
180
6800
120000
BG -2S
3/28/2016
6.4
179
2.8
176
9.9
20
71400
< 5000 U
71400
1.61+
< 100 U
66769
< 1000 U
8900
< 50 U
15300
2500
223
6700
144000
6/23/2016
67200
1 < 5000 U
67200
< 10 U
< 100 U
55656
< 5000 U
< 50 U
10800 1
1900
202 1
6100
122000
9/15/2016
6.3
148
3.5
170
59.0
21
73600
< 5000 U
73600
< 10 U
< 100 U
63833
< 2500 U
< 50 U
11800
2500
227
5800
119000
12/5/2016
6.5
144
2.8
162
23.7
15
70200
< 5000 U
70200
< 10 U
< 100 U
1 64585
< 2500 U
< 50 U
12200
2600
213
6500
127000 J
3/14/2017
6.3
131
4.1
138
9.4
13
60900
< 5000 U
60900
< 10.0 U
< 100 U
52319
< 1000 U
< 2500 U
< 50.0 U
10700
1900
198
5800
96000
4/13/2016
6.6
-6
1.23
236
1.1
17
108000
< 5000 U
108000
343
< 100 U
87056
< 1000 U
< 2500 U
< 50 U
13600
2400
170
10500
167000
6/23/2016
6.9
294
3.3
137
3.2
23
110000
< 5000 U
110000
< 10 U
< 100 U
84721
< 2500 U
< 50 U
12500
2300
186
10900
201000
BG-3BR
9/15/2016
6.6 1
123
3.3
235
9.6
17
105000
< 5000 U
105000
< 10 U
< 100 U
93068
< 2500 U
< 50 U
13700
2700
188
10800
182000
12/5/2016
6.7
187
3.2
238
5.7
14
108000
< 5000 U
108000
< 10 U
< 100 U
88938
< 2500 U
< 50 U
13200
2600
190
11000
177000
3/14/2017
6.7
144
5.4
230
0.0
13
106000
< 5000 U
106000
< 10.0 U
< 100 U
86408
< 1000 U
< 2500 U
< 50.0 U
14000
2500
195
10300
1 175000
7/20/2015
6.5
154
4.9
255
1 6.2
25
95200
< 5000 U
95200
1.2]
< 100 U
87352
6701
15100
261+
12400
3500
180
16000
183000
9/28/2015
6.5
193
4.78
217
8.4
19
1030001-
< 5000 U
103000
1.8 J+
< 100 U
90044
< 1000 U
< 2500 U
< 50 U
11500
3000
180
12600
194000
11/11/2015
6.6
86
5
441
4.4
16
101000
< 5000 U
101000
0.73 J+
< 100 U
85988
< 1000 U
3300
< 50 U
10700
2700
180
11000
248000
12/11/2015
6.6
180
4.39
250
0.9
15
108000
< 5000 U
108000
1.5 J+
< 100 U
87399
20700
< 2500 U
< 50 U
11100
2700
170
11500
177000
BG -3D
3/15/2016
6.5
180
4.88
246
7.8
17
115000
< 5000 U
115000
1.63+
< 100 U
86076
< 1000 U
< 2500 U
< 50 U
10900
2400
159
11700
170000
6/23/2016
6.3
151
4.2
241
0.7
20
100000
< 5000 U
100000
< 10 U
< 100 U
83593
< 2500 U
< 50 U
10400
2400
169
10900
187000
9/15/2016
6.2
198
5.1
236
2.0
20
98400
1 < 5000 U
98400
< 10 U
< 100 U
90118
< 2500 U
< 50 U
11200
2700
167
10900
177000
125 2016
6.5
183
5.7
229
0.1
15
103000
< 5000 U
103000
< 10 U
< 100 U
88384
< 5000 U
< 50 U
11000
2700
169
11200
172000
3 14 2017
6.5
140
6.8
231
6.7
10
105000
< 5000 U
105000
< 10.0 U
I < 100 U
87149
< 1000 U
< 2500 U
49.11
11000
2700
160
10800
240000
7/18/2015
6.4
-33
2.9
192
53.9
24
88900
< 5000 U
88900
2.3 J+
I < 100 U
80335
2800
51000
< 50 U
9260
2700
190
11500
1610001
9/28/2015
6.6
199
1 2.58
205
149.0 1
19
847001-
< 5000 U
84700
2.2 J+
< 100 U
85685
6701
129000
< 50 U
8930
2900
180
11700
172000
11/13/2015
6.3
241
5.3
204
200.1
15
80300
< 5000 U
80300
1.23+
< 100 U
99107
5101
306000
< 50 U
9690
3000
210
12700
169000
12/21/2015
6.7
164
7.1
205
104.6
12
73300
< 5000 U
73300
2.2 J+
< 100 U
115409
1200
159000
< 50 U
9790
2700
210
12000
199000
BG -35
3/15/2016
6.3
176
3
176
22.0
26
73200
< 5000 U 1
73200
1.6 J+
< 100 U
64502
< 1000 U
< 2500 U
< 50 U
7370
2100
152
10800
116000
6/23/2016
6.0
169
3.3
1 145
7.1
24
67300
< 5000 U
67300
< 10 U
< 100 U
56330
2700
< 50 U
6240
1600
163
9200
130000
9/15/2016
6.2
48
2
144
20.6
31
59400
< 5000 U
59400
< IOU
< 100 U
62767
< 2500 U
< 50 U
6840
2500
138
11600
147000
12 5 2016
6.3
82
2.9
154
35.5
12
61800
< 5000 U
61800
< 10 U
< 100 U
67121
50700
< 50 U
7100
2600
141
11800
132000
3 14 2017
6.3
167
3
159
34.8
13
72200
< 5000 U
72200
< 10.0 U
< 100 U
63143
< 1000 U
10700
26.4 J
7650)
3700
145
9400
151000
Page 1 of 6

TABLE 3-2
BACKGROUND GROUNDWATER ANALYTICAL RESULTS
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Page 2 of 6
Constituent Aluminum
Antimony
Arsenic
Barium
Beryllium
Cadmium
Chromium
Chromium
(VI)
Cobalt
Copper
INORGANIC PARAMETERS (TOTALS)
Iron Lead Magnesium Manganese
Mercury
Molybdenum
Nickel
Nitrogen,
NO2 plus
NO3
Potassium
Selenium
Sodium
Thallium
Vanadium
Zinc
15A NCAC 02L, IMAC:
NE
1
10
700
4
2
30
10
1
1000
300
15
NE
50
1
NE
100
NE
NE
20
NE
0.2
0.3
1000
*PPBCs:
1000
2.5
5
157.3
1
1
11.3
2.8
2.5
8.6
497.1
35.9
NE
48
0.2
2.5
11.3
NE
NE
10
NE
0.5
3.9
49
Reporting Units:
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
Fraction:
T
T
T
T
T
T
T
T
T
T
T
I T
T I
T
T
T
T
N
T
T
T
T
T
T
Location ID
Sample
Collection Date
Background Groundwater Analytical Results
4/29/2016
717
< 0.5 U
0.25
332
0.0613+
< 0.08 U
60.6
1.7
2
589
0.23 1
7470
60.1
< 0.2 U
2.4
31.8
240
6450
0.74
11500
< 0.1 U
10.7
< 10 U
BG-1BR
6/23/2016
253
0.76
1.1
265
0.036 J
< 0.08 U
7.7
--
0.6
0.68
296
0.23
6890
83.7
< 0.2 U
6.2
4.3
< 20 U
27600
0.6
18000
< 0.1 U
4
< 10 U
9/16/2016
71.6 J
0.29 J
0.84
300
0.0193
< 0.06 U
1.8
0.0771+
0.13
0.141
95.1
< 0.1 U
6760
56.4
< 0.2 U
6.5
1.1
< 20 U
28300
< 0.5 U
18500
< 0.1 U
1.81+
4.83+
12/5/2016
< 100 U
0.25 J
0.64
350
< 0.1 U
< 0.08 U
1.7
0.11
< 0.5 U
91.2
< 0.1 U
7060
90.4
< 0.2 U
4.9
1.2
< 20 U
22200
< 0.5 U
17300
< 0.1-U
1.6
< 10 U
BG-1BRA
3/15/2017
1490
0.98
0.98
55.3
0.16
< 0.080 U
4.6 J
1.6
0.48
2.7
671
1.3
4130
10.9
< 0.20 U
5.9
2.8
290
7040
2.0
49700
< 0.10 U
26.4
5.8 J
7/17/2015
180
< 0.5 U
0.42 J
68
< 0.2 U
0.03 J
3.1
--
3.3
2
310
0.19
6580
54
< 0.2 U
1.3
6.8
1100 1-
4630 J
0.65
12300
0.018 J
3.5
17
9/29/2015
< 100 U
< 0.5 U
0.26 J
70
< 0.2 U
0.0543
1.5 J+
0.99
2.5
473
< 0.1 U
7110
13
< 0.2 U
0.63
7.8
1100
49803
0.71
9000
0.023 J
3.4
6.81
11/11/2015
250
< 0.5 U 1
0.26 J
89
1 < 0.2 U
0.037 J
2.3 J+
1.2
3.8
350
0.11
7210
23
< 0.2 U 1
0.58
6.7
1200
4770 ]
0.59
10000 1
< 0.1 U
3.1
141+
12112015
<1000
<0.5U
0.81
98
<0.2U
<0.08U
0.63+
3.2
0.8 J+
10001
<0.1U
7010
75
<0.2U
1.5
7.2
310 J+
4920)
0.4)
18700
<0.1U
1.4
4.5)
BG -1D
3/15/2016
< 100 U
< 0.5 U
0.56
112
0.023 J
0.053 J
2.2 J+
1.8
2
56.2
< 0.1 U
7320
30.4
< 0.2 U
0.72 J+
7.4
950
4850 J
0.75
13000
< 0.1 U
2.2
12 J+
6/23/2016
< 100 U
< 0.5 U
0.32
118
0.0151
< 0.08 U
1.6
0.78
2.8
< 50 U
< 0.1 U
7160
36.2
< 0.2 U
0.62
6.9
1300
4870 J
1.4
12900
< 0.1 U
3.3
3.9 J
9/15/2016
< 100 U
< 0.5 U
0.26
128
< 0.1 U
< 0.08 U
1.2 3+
1
1
3.2
< 50 U
< 0.1 U
7180
41.2
< 0.2 U
0.5
7.1
1300
49403
2.7
12100
< 0.1 U
3
1 4.6 3
12/5/2016
< 100 U
< 0.5 U
0.21
127
0.0143
< 0.08 U
1.5
--
0.92
2.8
< 50 U
< 0.1 U
7740
37.7
< 0.2 U
0.44)
7.5
1400
5270
2.3
12300
0.0191
3.2
61
3/15/2017
< 100 U
< 0.50 U
0.19
132
0.055 J
< 0.080 U
2.8 J
1.6
0.76
3.6
< 50.0 U < 0.10 U
7560
31.9
< 0.20 U
0.451
7.6
1300
5240
2.1
11200
0.0541
3.9
4.71
7/17/2015
390
< 0.5 U
0.17 J
26
< 0.2 U
< 0.08 U
5.7
--
1.2 1
0.65 J
480
0.3
9720
160 1
<0.2U
1.2
3.8
2400 J-
< 5000 U
< 0.5 U
3610 J
0.023 J
3.8
5.2 J
9/29/2015
91 J
< 0.5 U 1
0.121
23
1 < 0.2 U
< 0.08 U
4.8 J+
0.46 J
< 1 U
97
0.099)
9350
130
< 0.2 U
0.51
2.3
2000
< 5000 U
< 0.5 U
3990 J 1
0.018 J
2.8
< 10 U
11/11/2015
560
< 0.5 U
0.163
42
< 0.2 U
< 0.08 U
5.8
0.45 J
0.781+
690
0.24 1
6010
17
< 0.2 U
< 0.5 U
3.2
3900
< 5000 U
0.21 J
< 5000 U
< 0.1 U
1.6
7.7 J+
12/11/2015
120
< 0.5 U
< 0.5 U
30
< 0.2 U
< 0.08 U
4.3
0.29 J
0.361+
130
0.0821
5450
11
< 0.2 U
< 0.5 U
3
2900
< 5000 U
< 0.5 U
< 5000 U
< 0.1 U
0.931
< 10 U
BG -1S
3/15/2016
368
< 0.5 U
0.11
27.3
0.111+
< 0.08 U
4.3
0.23
0.46 J
495
0.18
5570
8.9
< 0.2 U
< 0.5 U
2.6
3900
< 5000 U
< 0.5 U
< 5000 U
< 0.1 U
1.4
4.43+
6/24/2016
1820
< 0.5 U
0.32
39.5
0.14
< 0.08 U
12.6
0.59
1.3
2060
0.8
5700
24.8
< 0.2 U
< 0.5 U
4.5
2100
< 5000 U
0.52
12901
0.0393 1
5.3
20.8
9/15/2016
564
< 0.5 U
0.12
35.4
0.0561+
< 0.06 U
4.3
2.1
0.3
1.4
555
0.13
6360
20.2
< 0.2 U
< 0.5 U
3.5
2700
< 5000 U
< 0.5 U
1730 3
0.015 J
1.2
6.3 J
12/5/2016
614
< 0.5 U
0.21
30.2
0.07 ]
< 0.08 U
4.8 1
--
0.33
0.21 J
614
0.26
5930
22.5
< 0.2 U I
< 0.5 U
7.9
3200
< 5000 U
< 0.5 U
1720 J
0.051 J
2.2
4.81
3/15/2017
1570
0.11 J
0.32
40.7
0.20
< 0.080 U
25.5
8.3
0.95
3.2
1960
1.0
6560
23.9
< 0.20 U
0.35 J
13.2
2600
< 5000 U
0.61
1 1710 1
0.083 J
6.4
31.0
7/18/2015
3200
< 2.5 U 1
7.5
580
1 0.761
< 0.4 U
80.4
--
11.9
137
18200
17.5
10800
380
< 0.2 U
2.5 J
41.8
130 1-
9520
1.6 J
10300
0.23 J
100
68
9/29/2015
480
< 0.5 U
0.32 J
330
< 0.2 U
< 0.08 U
6.7
0.23 J
2.5
410
1 0.28
8980
19
< 0.2 U
0.141
1.3
240
5520
< 0.5 U
7420
< 0.1 U
13.3
5.4 3+
11/11/2015
270
0.23
0.27 )
380
< 0.2 U
< 0.06 U
6.2
0.23 J
1.5 J+
270
0.19
9450
13
< 0.2 U
0.243
0.9
240
5800
0.21 J
7840
< 0.1 U
12.1
16 J+
12/11/2015
53 J
< 0.5 U
0.243
380
< 0.2 U
< 0.08 U
7.4
< 0.5 U
0.643
403
< 0.1 U
9340
< 5 U
< 0.2 U
0.26 1
0.82
250
5760
< 0.5 U
7610
< 0.1 U
14.1
6.81
BG-2BR
3/2 2016
52.43
< 0.5 U
0.23
344
< 0.1 U
< 0.08 U
8.3 J+
0.141+
0.771+
59.5
0.11
9370
7.3
< 0.2 U
0.413+
0.993+
230
6060
< 0.5 U
8030
< 0.1 U
14
3.6 J
6232016
53.41
<0.5U
0.23
372
<0.1U
<0.08U
8.2
0.18
0.92
70.1
0.11
9120
9.7 1
<0.2U
0.211
1.2
250
5110
<0.5U
7210
<0.1U
15.4
<10U
9/15/2016
< 100 U
< 0.5 U
0.18
467
0.017 J+
< 0.08 U
7
8.1
0.063 J
0.43 J
< 50 U
< 0.1 U
10400
2.8 J
< 0.2 U 1
0.13 J
0.92
2301+
5700
< 0.5 U
7740
< 0.1 U
14.7
< 10 U
12/5/2016
< 100 U
< 0.5 U
0.19
403
< 0.1 U
< 0.08 U
8.5
0.085 3
0.52
42.51
< _0._l__U
9440
4.61
< 0.2 U
0.161
0.95
240
5220
< 0.5 U
7270
< 0.1 U
14.2
3.1 J
3/14/2017
< 100 U
< 0.50 U
0.21
403
1 < 0.10 U
< 0.080 U
8.2
7.5
0.0881
0.71
32.6 )
< 0.10 U
9290
4.0 J
< 0.20 U
0.16 J
0.96
2101
5550
< 0.50 U
7170
< 0.10 U
15.3
< 10.0 U
7/19/2015
530
< 0.5 U
0.77
180
< 0.2 U
< 0.08 U
9
--
0.38 J
2
140
0.22
3740
20
< 0.2 U
4.9
1.3
250
9660
0.5 J
12400
0.021 J
44
< 10 U
9/28/2015
630
< 0.5 U
0.341
250
< 0.2 U
< 0.08 U
6.3
0.57
0.743
150
0.1
7460
25
< 0.2 U
1.3
1.4
300
46203
0.241
10600
0.017 1
14.5
3.1 1+
11/13/2015
430
< 0.5 U
0.55
130
< 0.2 U
< 0.08 U
7.6
0.86
6.9
360
0.3
4680
7
< 0.2 U
1.6
1.4
370
3070 J
0.27 J
6890
< 0.1 U
17.8
3.1 1+
12/11/2015
530
< 0.5 U
0.28 3
260
< 0.2 U
< 0.08 U
6.8
0.22 J
0.781
330
0.2
5770
6.5
< 0.2 U
0.61
2.1
400
31403
0.31 3
7830
< 0.1 U
14
20
BG -2S
3/28/2016
470
< 0.5 U
0.26
305
0.0543
< 0.08 U
6.8 J+
0.39
0.611+
311
0.22
6940
4.43
< 0.2 U
0.35 J+
2.81+
370
3530 J
0.38 J
9190
< 0.1 U
12.8
< 10 -U -
0U6
6/23/2016
23 2016
309
< 0.5 U
0.23
295
0.012 J
< 0.08 U
6.6
0.19
0.6
275
0.19
6970
3.2 3
< 0.2 U 1
0.38 J
2.2
370
32701
< 0.5 U
9120
< 0.1 U
13
< 10 U
9/15/2016
268
< 0.5 U
0.17
383
0.011+
< 0.08 U
5.9
6
0.1
0.36 1
198
< 0.1 U
8350
< 5 U
< 0.2 U
0.23 J
3.3
3401+ 1
35201
0.32 J
9540
< 0.1 U
12.5
< 10 U
12/5/2016
1120
< 0.5 U
0.3
367
1 0.051
< 0.08 U
9.5
--
0.25
1.4
1330
0.57
8290
4.81
< 0.2 U
0.31 J
4.8
430
3580 J
0.32 3
8600
< 0.1 U
15.1
3.43
3/14/2017
475
< 0.50 U
0.24
310
0.025 J
< 0.080U
7.9
5.7
0.18
0.94
1 478
0.30
6220
3.41
< 0.20 U
0.373
3.1
3803
31103
< 0.50 U
7440
0.0161
15.4
< 10.0 U
4/13/2016
< 100 U
0.12 J
0.3
125
< 0.1 U
< 0.08 U
7.3
--
2.1
0.36 J+
464
< 0.1 U
12900
157
< 0.2 U
3.5
6.4
67
8200
0.46 J
13400
0.023 J
4.7
3.7 J+
6/23/2016
96.4 1
< 0.5 U
0.42
71.6
< 0.1 U
< 0.08 U
4.3
--
0.81
1
210
< 0.1 U
13000
13.1
< 0.2 U
2.1
6.1
170
7750
0.62
13100
< 0.1 U
11.1
10.3
BG-3BR
9/15/2016
234
< 0.5 U
0.38
67.4
< 0.1 U
< 0.08 U
4.11+
3.7
0.29
2 J+
299
< 0.1 U
14300
9
< 0.2 U
2.1
3.9
220
8190
0.411
14000
< 0.1 U
12
6.7 J+
12/5/2016
116
0.141
0.39
61.7
< 0.1 U
< 0.08 U
4.8
0.36
5.5
173
< 0.1 U
13600
7.1
< 0.2 U
2
4.2
320
7920
0.41
13400 1
< 0.1 U
11.7
31.8 J
3/14/2017
78.6 J
< 0.50 U
0.44
66.9
< 0.10 U
< 0.080 U
6.7
3.0
0.46
3.3
164
< 0.10 U
12500
7.4
< 0.20 U 1
2.2
5.0 1
270 J
8040
< 0.50 U
12500
0.0191
14.6
6.01
7/20/2015
230
< 0.5 U
0.47 J
1 760
< 0.2 U
< 0.08 U
6.6
--
1.8
6.1
250
0.26 J+
13700
24
< 0.2 U
3.2
7.9
330
1 12200
0.37 3
16000
0.021 J
21.9
11
9/28/2015
72 )
< 0.5 U
0.36 3
820
< 0.2 U
< 0.08 U
4.4
0.47 J
0.45 J
401
0.051 J
14900
11
< 0.2 U
0.38 3
6.2
380
8270
< 0.5 U
15100
< 0.1 U
22.1
3 J+
11/11/2015
< 100 U
< 0.5 U
0.32 J
880
< 0.2 U
< 0.08 U
4.1
0.243
0.661+
1 60
< 0.1 U
14400
6.9
< 0.2 U
0.31 J
5.7
290
7600
< 0.5 U
13900
< 0.1 U
21.9
2.8 J+
12/11/2015
< 100 U
< 0.5 U
0.393
820
< 0.2 U
< 0.08 U
2
0.241
0.281
< 50 U
I < 0.1 U
14500
12
< 0.2 U
0.263
6.2
160
8000
< 0.5 U
15700
< 0.1 U
1 23.8
2.81
BG -3D
3/15/2016
< 100 U
< 0.5 U
0.41
768
0.0243
0.0541
4.4
0.24
0.493
56.5
14300
191
< 0.2 U
0.33 J+
6.5
230
7390
< 0.5 U
15100
0.019 ]
20.5
7.63+
6/23/2016
< 100 U
< 0.5 U
0.4
800
0.0193
< 0.08 U
5.9
0.071 J
0.241
< 50 U
14000
5.3
< 0.2 U
0.22 J
5.3
450
7470
0.38 ]
13300
< 0.1 U
25.3
22.6
9/15/2016
< 100 U
< 0.5 U
0.45
855
< 0.1 U
< 0.08 U
6.6
7.1
0.077 l+
0.373+
< 50 U
15100
< 5 U
< 0.2 U
0.22 J
6.1
430
8020
0.52
14100
< 0.1 U
24.7
4.9 J+
12/5/2016
< 100 U
< 0.5 U
0.37
840
0.0131
< 0.08 U
5.7
--
0.037 3
0.54
< 50 U
P0.48
14800
< 5 U
< 0.2 U
0.19 3
5.1
480
7760
< 0.5 U
13800
< 0.1 U
23.9
2.7 J
3/14/2017
143
< 0.50 U
0.48
797
0.028 J
< 0.080 U
11.2
5.2
0.25
1.2
150
14500
9.7
< 0.20 U
0.33 J
8.0
360
7990
< 0.50 U
13700
0.0343
26.6
10.0
7/18/2015
2800
1
0.481
660
< 0.2 U
< 0.08 U
73.7
--
5
9.4
3400
13900
180
< 0.2 U
2.4
49.6
91 J-
6450
< 0.5 U
8480
0.072 3
14.4
159
28 2015
4200
0.17 J
0.4)
750
< 0.2 U
< 0.08 U
56.7
3.8
6.1
4900
15400
77
< 0.2 U
1.2
44.2
170
6960
0.441
9040
0.064 J
12.4
13 J+
11/13/2015
8300
2.4
0.75
1100
0.111
< 0.06 U
183
10.8
23.4
9100
1.4
18200
120
< 0.2 U
0.92
116
160
7720
0.43 J
8670
0.21
30.9
170
12/21/2015
14200
0.261
1
1300
0.74
0.0291
356
17.8
87.4
16500
2
22100
190
< 0.2 U
3.5
221
110 1+
9590
0.7
8670 1
0.31
1 58.8
110
BG -3S
3/15/2016
704
< 0.5 U
1.1
518
< 0.1 U
I < 0.08 U
19.3
0.81
2.4
847
0.13
11200
12.8
< 0.2 U
0.591+
16.7
120
47201
< 0.5 U
8150 1
0.019 J
1 7.7
27.91+
6/23/2016
259
< 0.5 U
0.26
392
< 0.1 U
< 0.08 U
9.2
0.3
1.4
315
0.093
9900
7.2
< 0.2 U
0.33 J
9.1
47
45203
< 0.5 U
7120
< 0.1 U
6.2
< 10 U
9/15/2016
793
< 0.5 U
0.3
578
< 0.1 U
< 0.08 U
20.5
10.1
0.73
2 J+
895
0.11
11100
11.5
< 0.2 U
0.23 J
17
110
47903
0.47 1
8430
0.028 J
9.1
9.33+
12/5/2016
3990
0.11 ]
0.46
766
0.058 J
< 0.08 U
81.5
4.6
11.1
4630
0.55
12000
54.9
< 0.2 U
0.49 J
60.4
190
5120
0.34 1
6420
0.11
17.4
19.41
3/14/2017
1450
0.16 ]
0.40
653
0.031)
< 0.080 U
64.5
11.3
2.1
7.5
1920
0.27
10700
29.0 1
< 0.20 U
0.79
45.9
1 220
5210 J
< 0.50 U
1
0.054 1
12.4
7.1 J
Page 2 of 6

TABLE 3-2
BACKGROUND GROUNDWATER ANALYTICAL RESULTS
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Page 3 of 6
Constituent
Aluminum
Antimony
Arsenic
Barium
Beryllium
Boron
Cadmium
Chromium
Cobalt
INORGANIC PARAMETERS (DISSOLVED)
Copper Iron Lead Manganese
Mercury
Molybdenum
Nickel
Selenium
Strontium
Thallium
Vanadium
Zinc
ISA NCAC 02L,IMAC:
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
*PPBCs:
1000
2.5
5
157.3
1
100
1
11.3
2.5
8.6
497.1
35.9
48
0.2
2.5
11.3
10
190
0.5
3.9
49
Reporting Units:
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
Fraction:
D
D
0
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
Location ID
Sample
Collection Date
Background Groundwater Anal
9 Analytical Results
4/29/2016
< 100 U
< 0.5 U
0.18
304
< 0.1 U
< 50 U
< 0.08 U
0.613+
1.4
0.161+
62.3
< 0.1 U
54.6
< 0.2 U
1.9
16.9
0.443
218
< 0.1 U
8.3
< 10 U
6/23/2016
< 100 U
0.56
1.1
235
< 0.1 U
< 50 U
< 0.08 U
1
0.0881
0.161
28.93
< 0.1 U
52.5
< 0.2 U
5.4
0.8
0.79
255
< 0.1 U
4
< 10 U
BG -IBR
9/16/2016
<1000
0.321
0.78
296
<0.1U
<50U
<0.08U
0.15 J+
0.0171
0.151+
<50U
<0.1U
41.7
<0.2U
6.2
0.54
24.6
319
<0.1 U
1.3 J+
<10U
12/5/2016
< 100 U
0.21
0.55
328
< 0.1 U
< 50 U
< 0.08 U
0.14 J
0.02 l
< 0.5 U
< 50 U
< 0.1 U
81
< 0.2 U
4.7
0.52
14.9
317
< 0.1 U
1.2
< 10 U
BG-1BRA
3/15/2017
88.0 J
0.80
0.78
37.2
0.0411
< 50.0 U
< 0.080 U
2.0
0.15
1.2
44.61
0.17
5.03
< 0.20 U
5.2
1.5
1.7
185
< 0.10 U
24.4
< 10.0 U
7/17/2015
< 100 U
0.22 1
0.28 3
62
< 0.2 U
< 50 U
0.027 1
1.4
2.9
1.1 J+
501
< 0.1 U
44
< 0.2 U
1.4
5.8
0.67
540
< 0.1 U
2.3
14
9/29/2015
< 100 U
< 0.5 U
0.23 J
74
< 0.2 U
< 50 U
0.085
1.2
0.95
2.2
< 50 U
< 0.1 U
12
< 0.2 U
0.85
7.7
0.62
620
0.018 J
3.5
5.61
11/11/2015
< 100 U
< 0.5 U
0.19 J
80
< 0.2 U
< 50 U
0.0391
1.8 J+
1.1
1 7.2
35 J
1 0.6
19
< 0.2 U
0.68
7.2
0.67
660
< 0.1 U
3.2
83+
12/11/2015
< 100 U
< 0.5 U
0.63
88
< 0.2 U
< 50 U
< 0.08 U
0.483
2.6
< I U
460
0.0483
59
< 0.2 U
1.1
8.6
0.481
640
0.0161
2.7
6.8 3
BG -1D
3/15/2016
< 100 U
< 0.5 U
0.62
82
0.023 1+
< 50 U
0.0771+
1.41+
1.3
12.8 J+
< 50 U
1.5 J+
18
< 0.2 U
0.63
7.3 J+
0.68
580
< 0.1 U
2.7
22 J+
6/23/2016
< 100 U
< 0.5 U
0.34
104
< 0.1 U
< 50 U
< 0.08 U
1.5
0.64
2.7
< 50 U
< 0.1 U
32.8
< 0.2 U
0.62
6.2
2
588
< 0.1 U
3
7.3 J
9 15 2016
< 100 U
< 0.5 U
0.25
118
< 0.1 U
< 50 U
< 0.08 U
1.2 J+
1
5
< 50 U
< 0.1 U
42.5
< 0.2 U
0.51
7.2
1.8
660
0.0171
2.9
6.83
1252016
<1000
<0.5U
0.22
118
<0.1U
<50U
<0.08U
1.4
0.85
3.4
<50U
<0.1U
39.3
<0.2U
0.38J
8.3
2
678
0.0213
3
7.13
3/15/2017
< 100 U
< 0.50 U
0,183
114
0.038 J
< 50.0 U
< 0.080 U
2.1
0.76
3.1
< 50.0 U
< 0.10 U
30.3
< 0.20 U
0.471
7.7
1.9
675
0.041 J
3.5
3.91
7/17/2015
< 100 U
< 0.5 U
< 0.5 U
22
< 0.2 U
< 50 U
< 0.08 U
3.3
0.66
0.431+
60
< 0.1 U
140
< 0.2 U
1.2
2.4
< 0.5 U
200
0.019 J
1.5
< 10 U
9/29/2015
< 100 0
< 0.5 U
0.12 3
23
< 0.2 U
461
< 0.08 U
4.5
0.39 1
0.321
61
0.0481
140
< 0.2 U
0.76
2.2
< 0.5 U
210
0.023 1
2.4
< 10 U
11112015
<1000
<0.5U
0.113
36
<0.2U
303
<0.08U
4
0.221
8.8
<50U
0.69
8
<0.2U
<0.5U
2.6
<0.5U
95
<0.1U
0.331
5.3 J+
12/11/2015
< 100 U
< 0.5 U
< 0.5 U
29
< 0.2 U
< 50 U
< 0.08 U
3.3
0.2 J
1.7
< 50 U
0.095 J
8.5
< 0.2 U
< 0.5 U
2.5
< 0.5 U
77
< 0.1 U
0.42 J 1
11
BG -1S
3/15/2016
< 100 U
< 0.5 U
0.0471
24
0.025 J+
< 50 U
< 0.08 U
2.1
0.13
0.84
< 50 U
< 0.1 U
5.8
< 0.2 U
< 0.5 U
2
< 0.5 U
73
< 0.1 U
0.283+
< 10 U
6/24/2016
71.6 J
< 0.5 U
0.14
30.3
0.033
< 50 U
< 0.08 U
5.6
0.23
1.7
67.3
0.1
10.9
< 0.2 U
< 0.5 U
3.4
< 0.5 U
80
< 0.1 U
1.5
24.8
9/15/2016
157
< 0.5 U
0.08 J
31.7
0.0583
27 J
< 0.08 U
2.4
0.23
4.7
89.2
< 0.1 U
17
< 0.2 U
< 0.5 U
3.8
< 0.5 U
92.4
0.0183
0.76
9.93
12/5/2016
94.5 ]
< 0.5 U
0.1
28.3
0.035 1
< 50 U
< 0.08 U
8.2
0.19
2.2
60.2
< 0.1 U
16.2
< 0.2 U
< 0.5 U
11.2
0.31 1
88.6
1 0.018 J
0.93
8.3 J
3/15/2017
< 100 U
< 0.50 U
0.0903
26.9
0.11 1
< 50.0 U
< O_.080_U
17.8
0.34
1.9
28.6 1
< 0.10 U
8.2
< 0.20 U
0.161
12.5
0.401
87.8
0.045 J
0.34
36.7
7/18/2015
< 100 U
--
--
280
--
< 50 U
--
--
--
--
< 50 U
--
30
0.32 J+
--
--
--
260
--
--
101
9/29/2015
< 100 U
< 0.5 U
0.23 J
360
< 0.2 U
< 50 U
< 0.08 U
7.7
< 0.5 U
0.391
< 50 U
< 0.1 U
5.1
< 0.2 U
0.181
1.2
< 0.5 U
230
< 0.1 U
14.3
< 10 U
11112015
<1000
<0.5U
0.233
400
<0.2U
<50U
<0.08U
7.3
<0.5U
2.7 J+
<50U
0.273+
5.3
<0.2U
0.213
1
<0.5U
250
<0.1U
14.3
8.31+
12/11/2015
< 100 U
< 0.5 U
0.25 J
360
< 0.2 U
< 50 U
< 0.08 U
7.4
< 0.5 U
8.3
< 50 U
1.1
< 5 U
< 0.2 U
0.241
0.91
< 0.5 U
230
< 0.1 U
14.3
3.5 J
BG-2BR
3282016
<1000
<0.5U
0.21
380
<0.1U
<50U
<0.08U
7.9
0.0371
0.471
<50U
<0.1U
2.73
<0.2U
0.253
0.86
<0.5U
230
<0.1U
14.3
<10U
6/23/2016
< 100 U
< 0.5 U
0.22
388
0.0253
< 50 U
< 0.08 U
6.6
0.037 1
1.6
< 50 U
< 0.1 U
< 5 U
< 0.2 U
0.161
1.1
0.383
216
< 0.1 U
14
< 10 U
9/15/2016
< 100 U
< 0.5 U
0.19
431
0.0123
< 50 U
< 0.08 U
6.4
0.033 1
0.56
< 50 U
< 0.1 U
< 5 U
< 0.2 U
0.13 1
0.83
0.311
233
< 0.1 U
13.8
< 10 U
12/5/2016
< 100 U
< 0.5 U
0.19
426
0.01 J
< 50 U
< 0.08 U
6.5
0.036 3
< 0.5 U
< 50 U
< 0.1 U
< 5 U
< 0.2 U
0.13 1
0.74
0.43 J
240
0.0233
13.4
< 10 U
3/14/2017
< 100 U
< 0.50 U
0.18
443
< 0.10 U
< 50.0 U
< 0.080 U
7.5
0.023 J
0.61 J
< 50.0 U
< 0.10 U
< 5.0 U
< 0.20 U
0.15 J
1.1
0.351
254
< 0.10 U
14.6
< 10.0 U
7192015
160
<0.5U
0.62
180
<0.2U
<50U
<0.08U
7
<0.5U
2.3
<50U
0.12 J+
7.4
0.141
3.4
0.56
0.491
270
0.023
23.8
2.71
9/28/2015
92 1
< 0.5 U
0.33 J
260
< 0.2 U
< 50 U
< 0.08 U
5.9
0.37 3
0.55 1
< 50 U
< 0.1 U
16
< 0.2 U
1.5
1
0.33
240
< 0.1 U
14.6
< 10 U
11/13/2015
< 100 U
< 0.5 U
0.51
130
< 0.2 U
< 50 U
< 0.08 U
6.3
0.75
1.4
< 50 U
0.0941
4.33
< 0.2 U
1.2
0.84
0.29 J
160
< 0.1 U
16.8
3.61
12112015
843
<0.5U
0.243
240
<0.2U
<50U
<0.08U
5.9
<0.5U
10
<50U
1
4.21
<0.2U
0.6
1.6
0.263 1
160
<0.1U
13.1
53
BG -2S
3/28/2016
140
0.111
0.19
1 270
0.012 J
< 50 U
< 0.08 U
5.7
0.25
0.443
1 80
< 0.1 U
3.5 J
< 0.2 U
0.283
2.5
0.391
200
< 0.1 U
10.8
181+
6232016
57.13
<0.5U
0.19
262
0.021]
<50U
<0.08U
5
0.0723
1.1
<50U
<0.1U
<5U
<0.2U 1
0.271
2.1
0.57
182
<0.1U
10.8
2.8J
9/15/2016
< 100 U
< 0.5 U
0.16
351
0.0183
< 50 U
< 0.08 U
5.4
0.064 J
1.3
< 50 U
< 0.1 U
< 5 U
< 0.2 U
0.23 J
4.5
< 0.5 U
218
<-O.1 U
11.4
31
125/2016
70.51
<0.5U
0.16
357
0.0223
<50U
<0.08U
6
0.0493
<0.5U
29.91
<0.1U
<5U
<0.2U
0.281
3.5
<0.5U
213
0.0261
1 10.9
33
3/14/2017
54.2 3
< 0.50 U
0.16
301
0.032 J
< 50.0 U
< 0.080 U
5.7
0.0671
0.75
< 50.0 U
< 0.10 U
< 5.0 U
< 0.20 U
0.36 3
2.8
< 0.50 U
194
0.0483
11.3
< 10.0 U
4/13/2016
< 100 U
< 0.5 U
0.3
131
< 0.1 U
< 50 U
< 0.08 U
3.5 J+
2.4
0.483
462
< 0.1 U
174
< 0.2 U
4
7
0.38 1
173
< 0.1 U
4.8
4.81
6/23/2016
< 100 U
< 0.5 U
0.26
57.9
0.015 1
< 50 U
< 0.08 U
2.3
0.51
1.6
< 50 U
< 0.1 U
8.5
< 0.2 U
2.1
5.4
0.441
160
< 0.1 U
9.7
13.1
BG -3 BR
9/15/2016
< 100 U
< 0.5 U
0.3
57.7
< 0.1 U
< 50 U
< 0.08 U
3.3
0.17
1.83+
< 50 U
< 0.1 U
5.2
< 0.2 U
2
3.2
< 0.5 U
180
< 0.1 U
10.8
3.5 J+
12/5/2016
< 100 U
< 0.5 U
0.35
58.4
< 0.1 U
< 50 U
< 0.08 U
3.5
0.18
2.3
< 50 U
< 0.1 U
4.31
< 0.2 U
2
3.2
< 0.5 U
187
< 0.1 U
11.6
23.3
3114/2017
< 100 U
< 0.50 U
0.39
63.7
< 0.10 U
< 50.0 U
< 0.080 U
4.3
0.42
1.3
< 50.0 U
< 0.10 U 1
5.4
< 0.20 U 1
2.1
5.5
< 0.50 U
189
0.0193
13.1
18.5
7/20/2015
< 100 U
< 0.5 U
0.45 J
690
< 0.2 U
421
< 0.08 U
2.7
1.9
1.1 J+
< 50 U
< 0.1 U
21
< 0.2 U
1.1
7.3
< 0.5 U
160
< 0.1 U
21.6 1
5.1 J
9/28/2015
< 100 U
< 0.5 U
0.43 J
810
< 0.2 U
< 50 U
< 0.08 U
5.1
0.493
0.381
< 50 U
< 0.1 U
9.3
< 0.2 U
0.421
7.1
< 0.5 U
170
< 0.1 U
25
< IOU
11112015
<1000
<0.5U
0.363
870
<0.2U
<50U
<0.08U
4.2
0.221
0.29 J+
<50U
0.0463+
6.7
<0.2U
0.363
6
<0.5U
180
<0.1U
24.5
2.73+
12111/2015
< 100 U
< 0.5 U
0.413
810
< 0.2 U
< 50 U
< 0.08 U
2.2
0.23 1
8.5
< 50 U
0.91
13
< 0.2 U
0.261
6.4
< 0.5 U
160
< 0.1 U
24.1
4.13
BG -3D
3/15/2016
< 100 0
< 0.5 U
0.38
730
< 0.1 U
I < 50 0
< 0.08 U
43+
0.25 J+
0.46 J+
< 50 U
< 0.1 U
24
< 0.2 U
0.31 J
5.8 1+
< 0.5 U
150
< 0.1 U
20.5
91+
6/23/2016
< 100 U
< 0.5 U
0.38
767
0.01 1
< 50 U
< 0.08 U
5.5
0.0793
1.5
< 50 U
< 0.1 U
4.81
< 0.2 U
0.243
6.5
< 0.5 U
156
< 0.1 U
24.4
29.8
9/15/2016
< 100 U
< 0.5 U
0.41
819
< 0.1 U
< 50 U
< 0.08 U
5.7
0.0283
2.21+
< 50 U
< 0.1 U
< 5 U
< 0.2 U
0.221
5.4
< 0.5 U
163
< 0.1 U
24
5.71+
12/5/2016
< 100 U
< 0.5 U
0.39
816
0.01 J
< 50 U
< 0.08 U
5.3
0.0353
1 0.13 J
< 50 U
< 0.1 U
< 5 U
< 0.2 U
0.211
4.9
< 0.5 U
168
< 0.1 U
23.2
< 10 U
3142017
<1000
<0.50U
0.43
814
<0.10U
<50.0U
<0.080U
5.8
0.0881
0.503
39.93
<0.10U
4.71
<0.20U
0.253
5.3
<0.50U
169
0.024J
24.9
14.9
7/18/2015
< 100 U
< 0.5 U
0.243
530
< 0.2 U
< 50 U
< 0.08 U
3.1
0.97
1.93+
< 50 U
0.0873+
120
0.261+
3.2
8.9
< 0.5 U
190
< 0.1 U
5.3
14
9/28/2015
< 100 U
0.161
0.281
550
< 0.2 U
< 50 U
< 0.08 U
5.8
0.243
< 1 U
< 50 U
< 0.1 U
25
< 0.2 U
1.6
9.4
0.32 J
170
< 0.1 U
5.9
< 10 U
11/13/2015
< 100 U
5
0.341
490
< 0.2 U
< 50 U
0.0481
7.5
0.491
9.5
< 50 U
1.2
27
< 0.2 U
0.89
8.8
0.39 J
160
0.0581
6.4
280
12/21/2015
2600
< 0.5 U
0.443
740
0.26
1 < 50 U
< 0.08 U
77.8
4.4
21.6
2400
0.5
53
< 0.2 U
1.6
54.5
0.6
190
0.086 1+
16.3
62
BG -3S
3/15/2016
< 100 U
< 0.5 U
0.81
440
< 0.1 U
< 50 U
< 0.08 U
6.3 J+
0.0653+
121+
< 50 U
1.41+
5
< 0.2 U
0.71
7.8 J+
< 0.5 U
150
< 0.1 U
5.6
53 3+
6/23/2016
< 100 U
< 0.5 U
0.27
422
< 0.1 U
< 50 U
< 0.08 U
8.2
1 0.0863
2.2
< 50 U
< 0.1 U
31
< 0.2 U
0.261
9.4
0.56
128
< 0.1 U
6.7
5J
9152016
92.41
<0.5U
0.25
518
<0.1U
<50U
<0.08U
10.3
0.16
2.7]+
81.8
<0!1U
4.13
<0.2U
0.213
10.8
<0.5U
133
<0.1U
7.1
8.3 1+
12/5/2016
102
< 0.5 U
0.29
543
0.012 J
< 50 U
< 0.08 U
6.8
0.18
3.6
74.9
< 0.1 U
6.5
< 0.2 U
0.22 J
10.2
< 0.5 U
135
< 0.1 U
7.4
14.5
3/14/2017
71.3 J
0.141
0.34
593
0.014 J
< 50.0 U
< 0.080 U
9.1
0.64
2.8
114
< 0.10 U
34.6
< 0.20 U
0.77
23.4
< 0.50 U 1
152
0.0223
1 7.8
3.8 J
Page 3 of 6

TABLE 3-2
BACKGROUND GROUNDWATER ANALYTICAL RESULTS
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Constituent
pH
ORP
FIELD
DO
PARAMETERS
Spec
Cond
Turbidity
Temp
Alkalinity
Carbonate
Alkalinity
Bi-
carbonate
Alkalinity
WATER QUALITY PARAMETERS
Total
Methane Sulfide Hardness 1
(Ca and Mg)
Total
Organic
Carbon
Total
Suspended
Solids
SELECTED 40CFR257
Boron Calcium
APPENDIX
Chloride
III CONSTITUENTS + STRONTIUM
Total Dissolved
Strontium Sulfate
Solids
15A NCAC 02L, IMAC:
6.5-8.5
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
700
NE
250000
NE
250000
500000
*PPBCs:
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
100
NE
3500
190
1460
85400
Reporting Units:
SU
mV
m /L
umhos/cm
NTU
De C
u /L
u /L
u /L
u /L
u /L
u /L CaCO3
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
Fraction:
N
N
N
N
N
N
N
N
N
N
N
T
N
N
T
T
N
T
N
N
Location ID
Sample
Collection Date
Background Groundwater
Analytical Results
2/7/2011
6.0
44
7.5
13
< 50 U
140
54000
5/1/2011
5.8
48
11.6
17
< 50 U
160
46000
10/5/2011
5.9
49
5.3
15
< 50 U
250
63000
2/8/2012
5.5
410
6.81
45
1.6
15
< 50 U
200
63000
6/6/2012
5.7
396
6.89
44
3.8
17
--
--
--
< 50 U
160
55000
10/4/2012
5.6
416
7.13
49
4.4
16
< 50 U
200
46000
2/6/2013
5.9
389
9.12
46
7.6
16
21000
11595
< 50 U
3460
120
48000
5/5/2013
5.8 1
394
8.38
46 1
5.9
17
20000
11761
< 5260 U
< 50 U
3510
230
46000
10/1/2013
5.9
376
7.88
45
5.2
17
13000
11500 1
< 50 U
3440
130
55000
2/6/2014
5.7
385
8.3
46
2.5
14
15000
11998
< 50 U
3600
130
43000
6/4/2014
5.5
379
8.08
46
12.5
16
11000
11483
< 50 U
3420
110
46000
MW -4
10/8/2014
5.7
360
7.58
45
7.9
16
16000
11648
< 50 U
3310
120
50000
2/4/2015
5.4
370
7.64
46
11.5
14
21000
12706
< 50 U
3460
110
46000
5/8/2015
5.7
408
8.63
46
1.0
16
18300
< 5000 U
18300
11699
< 3350 U
< 50 U
3490
110
53000
7/10/2015
5.7
184
4.2
71
9.9
27
15400
< 5000 U
15400
1.9 J+
< 100 U
10333
< 1000 U
127000
< 50 U
3080
1900
78
< 1000 U
420003+
9/30/2015
5.5
-96
5.34
51
29.1
23
20000
< 5000 U
20000
1.3 J+
< 100 U
12673
< 1000 U
114000
< 50 U
3740
2300
87
< 1000 U
53000
12/11/2015
5.9
254
5.38
44
1.4
14
22400
< 5000 U
22400
1.4 3+
< 100 U
13495
10600
4700
< 50 U
4160
2000 J-
100
< 1000 U
41000
3/15/2016
5.3
232
5.1
56
0.5
17
19300
< 5000 U
19300
1.5 J+
< 100 U
11455
< 1000 U
< 2500 U
< 50 U
3450
1700
78.7
6503
36000
6/22/2016
5.7
262
1.5
52
4.0
21
19600
< 5000 U
19600
< 10 U
< 100 U
12689
32900
< 50 U
3730
1500
92.4
700 J
< 25000 U
12/2/2016
5.9
192
5.4
54
2.8
15
20600
< 5000 U
20600
< 10 U
< 100 U
13360
< 5000 U
< 50 U
4020
1800
95.6
< 1000 U
49000
2/9/2017
5.8
460
7.87
48
1.7
15
20700
12430
5.7 J
3740
2110
124
50000
3/14/2017
6.0
217
7
50
0.6
11
1 22500
< 5000 U
22500
< 10.0 U
< 100 U
13120
< 1000 U
< 2500 U
< 50.0 U
3980
1700
104
< 1000 U
42000
2/7/2011
6.2
73
4.9
14
< 50 U
1200
82000
6/1/2011
6.1 1
77
0.7
17
< 50 U
1300
58000
10/5/2011
6.2
76
0.7
15
< 50 U
1200
88000
2/8/2012
6.1
378
6.04
76
7.5
15
< 50 U
1400
95000
5/6/201
6.0
383
5.92
74
1.1
16
< 50 U
1300
73000
10/4/2012
6.1
411
5.98
75
0.7
16
< 50 U
1200
76000
2/6/2013
6.0
387
5.99
75
1.9
16
35000
19127
< 50 U
5550
1300
84000
6/5/2013
6.0
391
5.75
77
0.6 1
16
34000
20289
< 5000 U
< 50 U
5900
1400
83000
10/1/2013
6.1
369
5.47
77
1.0
16
31000
20057
< 50 U
5840
1300
85000
2/6/2014
6.0
375
5.66
76
2.2
15
32000
19559
< 50 U
5690
1400
73000
MW -4D
6/4/2014
5.9
386
5.54
79
5.6
16
30000
20041
< 50 U
5850
1400
83000
10/8/2014
6.1
354
5.91
77
2.7
16
32000
19219
< 50 U
5620
1400
79000
2/4/2015
6.0 1
349
5.87
77
3.6
15
35000
19601
< 50 U
5740
1400
73000
5/8/2015
5.9
406
6.02
77
0.8
16
33000
< 5000 U
33000
20246
< 3350 U
< 50 U
5850
1400
87000
7/10/2015
6.2
159
4.3
120
1 8.9
21
31800
< 5000 U 1
31800
1.3 1+
< 100 U
19650
< 1000 U
3500
< 50 U
5710
1200
180
1000 J
82000 J+
9/30/2015
5.9
-98
8.14
81
9.6
21
34800
< 5000 U
34800
13+
< 100 U
20314
< 1000 U
56500
< 50 U
5910
1800
190 1
1700
67000
12 11 2015
6.3
208
5.82
63
1.3
14
35700
< 5000 U
35700
1.5 J+
< 100 U
21014
< 1000 U
< 5200 U
< 50 U
6240
1700
190 1
1300
1 59000
3/15/2016
5.9
206
4.1
88
1.6
18
35700
< 5000 U
35700
1.4 J+
< 100 U
20921
13700
3300
< 50 U
6120
1300
189 1
180
1 71000
6/22/2016
6.0
221
2.3
80
4.0
19
36800
< 5000 U
36800
< 10 U
< 100 U
21729
13300
< 50 U
6180
1100
193
1600
41000
12/2/2016
6.1
123
4.8
80
2.4
16
36600
< 5000 U
36600
< 10 U
< 100 U
22197
< 2500 U
< 50 U
6450
1300
201
1300
68000
3114/2017
6.4
79
6.2
73
0.2
15
36400
< 5000 U
36400
< 10.0 U
-:5-100 U
20796
< 1000 U
< 5000 U I
< 50.0 U
6070
1200
177
9601
95000
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)
-- - Not Analyzed
< - concentration not detected at or above
the adjusted reporting limit.
D - Dissolved
NTU - Nephelometric turbidity unit
Deg C - Degrees Celsius
ORP - Oxidation -Reduction Potential
DO - Dissolved oxygen
S.U. - Standard Unit
J- - Estimated concentration, biased low.
Spec Cord - Specific Conductance
J - Laboratory estimated concentration.
T - Total
J+ - Estimated concentration, biased high.
Temp - Temperature
mg/L - Milligrams per liter
U - Results not detected at concentrations which equal the laboratory's method reporting limit.
my - Millivolts
ug/L - Micrograms per liter
N- Normal
umhos/cm - Micro mhos per centimeter
NE - Not established
*PPBCs - Proposed Provisional Background
Concentrations provided are those reported in Table 2-2 of the Corrective Action Plan Part 1, Marshall Steam Station Ash Basins (HDR, 2016)
1 - Total Hardness values for background groundwater
locations were calclulated using calcium and magnesium fractions (Ref: http://www.water.ncsu.edu/watemhedss/info/hardness.html, accessed on July 12, 2016)
Prepared by: DMV Checked by: TDP
Page 4 of 6

TABLE 3-2
BACKGROUND GROUNDWATER ANALYTICAL RESULTS
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Constituent Aluminum
Antimony
Arsenic
Barium
Beryllium
Cadmium
Chromium
Chromium
(VI)
Cobalt
Copper
INORGANIC PARAMETERS (TOTALS)
Iron Lead Magnesium Manganese
Mercury
Molybdenum
Nickel
Nitrogen,
NO2 plus
NO3
Potassium
Selenium
Sodium
Thallium
Vanadium
Zinc
15A NCAC 02L, IMAC:
NE
1
10
700
4
2
30
10
1
1000
300
15
NE
50
1
NE
100
NE
NE
20
NE
0.2
0.3
1000
*PPBCs:
1000
2.5
5
157.3
1
1
11.3
2.8
2.5
8.6
497.1
35.9
NE
48
0.2
2.5
11.3
NE
NE
10
NE
0.5
3.9
49
Reporting Units:
u /L
u /L
u /L
u /L
u /L
ug/L
ug/L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
ug/L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
Fraction:
T
T
T
T
T
T
T
T
T
T
T
I T
T
T
T
T
T
N
I T
T I
T
I T
I T
T
Location ID
Sample
Collection Date
Background Groundwater Analytical Results
272011
<lU
<lU
48
<lU
<5U
<5U
128
<lU
8
<0.05U
<5U
<lU
<5U
612011
--
<lU
<lU
55
--
<lU
<SU
--
--
<SU
160
<lU
--
9
<O.OSU
-
<SU
<1U
<5U
1052011
--
<lU
<lU
53
--
<lU
<SU
--
--
<SU
109
<lU
--
5
<O.OSU
--
<SU
<1U
<5U
282012
<1U
<1U
49
<1U
<5U
<5U
70
< I U
7
<0.05U
<5U
<1U
<5U
662012
< I U
<1U
50
<lU
<5U
<5U
180
< I U
11
<0.05U
<5U
<1U
<5U
1042012
<lu
<1U
46
<lU
<5U
<5U
38
<lU
5
<0.05U
<5U
<lU
<5U
262013
<lU
<lU
45
<lU
<5U
<5U
77
<lU
718
<5U
<0.05U
<5U
1920
<lU
3820
<5U
652013
<1U
I < I U
48
<lU
<5U
<5U
164
<lU
728
<5U
<0.05U
<5U
2010
<lU
3940
<5U
1012013
<1U
<1U
46
<lU
<5U
<5U
137
<1U
707
<5U
<0.05U
<5U
1990
<1U
3910
<5U
262014
< I U
<1U
48
<lU
<5U
5
66
<1U
731
<5U
<0.05U
<5U
2050
<1U
4230
<5U
642014
<lU
<lU
48
<lU
<5U
<5U
190
< I U
715
9
<0.05U
<5U
1990
<lU
4010
<5U
MW -4
1082014
<1U
<1U
53
<1U
<5U
<5U
782
<lU
822
24
<0.05U
<5U
2120
< I U
4100
<5U
242015
<1U
<1U
59
<1U
<5U
<5U
1380
<1U
988
38
<0.05U
<5U
2340
<1U
4210
8
6/82015
33
<1U
<1U
47
<1U
<1U
<5U
<1U
<5U
33
<1U
725
<5U
<0.05U
<1U
<5U
1970
<1U
4140
<5U
7/10/2015
450
< 2.5 U
< 2.5 U
48
< 1 U
< 0.4 U
2.5 J
< 2.5 U
6.8
510
0.78
642
19
< 0.2 U
< 2.5 UJ
< 2.5 U
< 20 UJ
< 5000 U
< 2.5 U
38703
< 0.5 U
2.21
< 10 U
9/30/2015
1000
0.51
1 0.141
58
1 0.121
< 0.08 U
5.7
0.51
8.6
1 1400
0.78
810
34
< 0.2 U
0.21
3
250
< 5000 U
< 0.5 U
4370 J
0.032 J
3.9
49
12112015
180
<0.5U
<0.5U
50
<0.2U
<0.08U
2.7
<0.5U
0.341
250
0.12
755
4.71
<0.2U
0.141
0.66
15J
<5000U
<0.5U
42501
<0.1U
1.7
<10U
3/15/2016
50.3 3
< 0.5 U
0.053 3
41.7
0.1 J+
< 0.08 U
23+
0.0281
0.163
78.5
< 0.1 U
690
< 5 U
< 0.2 U
0.123
0.5
26
< 5000 U
< 0.5 U
4320 1
< 0.1 U
0.963+
< 10 U
6/22/2016
2020
< 0.5 U
0.13
71
0.046 3
< 0.08 U
2.1
0.29
0.341
2230
0.32
820
37.5
0.0963
< 0.5 U
0.6
201
< 5000 U
< 0.5 U
43201
< 0.1 U
1.8
6.61
12/2/2016
99.5 J
< 0.5 U
0.079 J
48.3
0.035 J
< 0.08 U
2
0.052 J
0.291
145
< 0.1 U
807
3.9 J
< 0.2 U
0.121
< 0.5 U
44
< 5000 U
< 0.5 U
45801
< 0.1 U
1.2
< 10 U
292017
<1U
48.5
<1U
1.413
1.561
36.9
<1U
751
1.461
<0.05U
<5U
2040
<1U
4290
<5U
3114/2017
80.3 J
< 0.50 U
0.0481
50.4
0.033 J
< 0.080 U
2.6
1.5
0.0491
0.53 J
114
< 0.10 U
773
2.6 J
< 0.20 U
0.22 J
0.54
25
< 5000 U
< 0.50 U
44601
< 0.10 U
1.4
< 10.0 U
272011
<1U
<lU
43
< I U
<5U
<5U
268
<1U
38
<0.05U
<5U
<1U
-
<5U
6/12011
<1U
<lU
43
<1U
<5U
<5U
21
<1U
<5U
<0.05U
<5U
<1U
<5U
1052011
<1U
<lU
43
<1U
<5U
<5U
26
<1U
<5U
<0.05U
<5U
<1U
<5U
2/8/2012
<1U
<1U
46
<1U
<5U
<5U
376
<1U
48
<0.05U
<5U
<1U
<5U
662012
<lU
<1U
43
<lU
<5U
<5U
88
<lU
9
<0.05U
<5U
<lU
<5U
1042012
--
< I
<1U
41
--
<1U
<5U
--
--
<5U
41
<1U
--
<5U
<0.05U
--
<5U
--
--
< I U
--
--
--
<5U
262013
< I U
<1U
41
<1U
<5U
<5U
17
<1U
1280
<5U
<0.05U
<5U
2100
<1U
7230
<5U
652013
< I U
< I U
43
<1U
<5U
<5U
18
<1U
1350
<5U
<0.05U
<5U
2230
< I U
7660
<5U
1012013
<1U
<1U
42
<1U
<5U
<5U
17
<1U
1330
<5U
<0.05U
<5U
2190
<lU
7520
<5U
262014
<1U
<1U
42
<1U
<5U
<5U
16
<1U
1300
<5U
<0.05U
<5U
2170
<1U
7480
<SU
MW -4D
6/4/2014
< 1 U
< 1 U
42
< 1 U
< 5 U
< 5 U
25
< 1 U
1320
< 5 U
< 0.05 U
< 5 U
2210
< 1 U
7660
< 5 U
1082014
<1U
<1U
41
<1U
<5U
<5U
37
<lU
1260
<5U
<0.05U
<5U
2130
<1U
7420
<5U
242015
<1U
<1U
42
<1U
<5U
<5U
<10U
<1U
1280
<5U
<0.05U
<5U
2200
<1U
7670
5
682015
23
<1U
<1U
42
<lU
<1U
<5U
<lU
<5U
24
<1U
1370
<5U
<0.05U
<1U
<5U
2190
<1U
7520
<5U
7/10/2015
56 1
0.333
0.33 3
40
< 0.2 U
< 0.08 U
1.2 J+
< 0.5 U
0.38 3
77
0.0783
1310
4.1 1
< 0.2 U
0.75 J+
0.41
12 1-
< 5000 U
< 0.5 U
7640
< 0.1 U
2.8
< 10 U
9/30/2015
75 1
0.463
< 0.5 U
41
< 0.2 U
< 0.08 U
11.3
0.3 J
2.4
210
0.073 J
1350
15
< 0.2 U
1 0.93
11.3
45
< 5000 U
< 0.5 U
7500
< 0.1 U
2.5 J+
28J+
12/11/2015
56 J
< 0.5 U
< 0.5 U
42
< 0.2 U
< 0.08 U
1.21+
< 0.5 U
0.811
88
0.065 J
1320
4.81
< 0.2 U
1 0.343
0.72
36
< 5000 U
< 0.5 U
7370
< 0.1 U
2.9
2.8 J+
3/15, 2016
190
< 0.5 U
0.078 1
41
0.0393+
< 0.08 U
0.621+
0.1
110
< 0.1 U
1370
51
< 0.2 U
0.341
0.463
34
< 5000 U
< 0.5 U
8110
< 0.1 U
2.5
< 10 U
6 22 2016
871
< 0.5 U
0.22
52.2
< 0.1 U
< 0.08 U
0.79
0.36
0.96
1120
0.19
1530
32.1
0.13
0.22 J
0.5 J
25
< 5000 U
< 0.5 U
7810
< 0.1 U
3.9
4.43
1222016
60.67
<O.SU
0.11]
42.2
0.035)
<0.08U
0.5
0.0431
0.393
92.9
<O.2U
1480
4.33
<0.2U
0.47
<O.SU
29
<SOOOU
<O.SU
8220
<0.1U
2.7
<10U
3142017
<1000
<0.50U
0.0511
37.5
<O.lOU
<O.O30U
0.537
0.377
<0.10U
0.223
<50.0U<0.10U
1370
2.71
<0.20U
0.321
<O.SOU
38
<5000U
<O.SOU
7990<10.0U
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)
-- - Not Analyzed
< - concentration not detected at or above the adjusted reporting limit.
D - Dissolved NTU - Nephelometric turbidity unit
Deg C - Degrees Celsius ORP - Oxidation -Reduction Potential
DO - Dissolved oxygen S.U. - Standard Unit
J- - Estimated concentration, biased low. Spec Cond - Specific Conductance
J - Laboratory estimated concentration. T - Total
)+ - Estimated concentration, biased high. Temp - Temperature
mg/L - Milligrams per liter U - Results not detected at concentrations which equal the laboratory's method reporting limit.
my - Millivolts ug/L - Micrograms per liter
N- Normal umhos/cm - Micro mhos per centimeter
NE - Not established
*PPBCs - Proposed Provisional Background Concentrations provided are those reported in Table 2-2 of the Corrective Action Plan Part 1, Marshall Steam Station Ash Basins (HDR, 2016)
1 - Total Hardness values for background groundwater locations were calclulated using calcium and magnesium fractions (Ref: http://www.water.ncsu.edu/watemhedss/info/hardness.html, accessed on July 12, 2016)
Prepared by: DMV Checked by: TDP
Page 5 of 6

TABLE 3-2
BACKGROUND GROUNDWATER ANALYTICAL RESULTS
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Constituent
Aluminum
Antimony
Arsenic
Barium
Beryllium
Boron
Cadmium
Chromium
Cobalt
INORGANIC PARAMETERS (DISSOLVED)
Copper Iron Lead Manganese
Mercury
Molybdenum
Nickel
Selenium
Strontium
Thallium
Vanadium
Zinc
15A NCAC 02L, IMAC:
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
*PPBCs:
1000
2.5
5
157.3
1
100
1
11.3
2.5
8.6
497.1
35.9
48
0.2
2.5
11.3
10
190
0.5
3.9
49
Reporting Units:
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
u /L
Fraction:
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
Location ID
Sample
Collection Date
Background Groundwater Analytical Results
2/7/2011
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
'-
--
--
6/1/2011
-
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
10/5/2011
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
2/8/2012
--
--
--
--
--
--
--
--
--
'-
--
--
--
--
--
--
--
--
5/6/2012
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
10/4/2012
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
2/6/2013
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
652013
<1U
<1U
46
<50U
<lU
<5U
<5U
<10U
<1U
<5U
<0.05U
<5U
<1U
<5U
10/1/2013
2/6/2014
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
6 4/2014
MW-4
10/8/2014
-
--
--
--
--
--
--
--
--
--
--
--
--
--
--
2/4/2015
-
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
6/8/2015
-
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
7/1012015
< 100 U
0.51
874
41
< 0.2 U
< 50 UJ
< 0.08 U
0.241+
< 0.5 U
< 1 UJ
< 50 U
0.0863+
9.2
< 0.2 U
2.61+
0.343
__0.461___
73
0.0721+
1.6
53+
9/30/2015
< 100 U
0.441
< 0.5 U
44
< 0.2 U
< 50 U
< 0.08 U
1.8
< 0.5 U
5.2
< 50 U
< 0.1 U
8.8
< 0.2 U
0.143
1.2
< 0.5 U
83
0.03 1
0.721
37
12/11/2015
< 100 U
< 0.5 U
< 0.5 U
45
< 0.2 U
< 50 U
< 0.08 U
1.7 J+
< 0.5 U
2.41+
< 50 U
0.18
< 5 U
< 0.2 U
< 0.5 U
0.22 J+
< 0.5 U
84
< 0.1 U
0.921
15
3/15/2016
< 100 U
< 0.5 U
< 0.1 U
39
0.0491+
< 50 U
< 0.08 U
1.4
< 0.1 U
5.5
< 50 U
0.58
< 5 U
< 0.2 U
< 0.5 U
< 0.5 U
< 0.5 U
73
< 0.1 U
0.641+
6.51
6/22/2016
< 100 U
< 0.5 U
0.057 J
41.4
0.053 J
< 50 U
< 0.08 U
1.5
0.063
3.2
< 50 U
< 0.1 U
< 5 U
< 0.2 U
< 0.5 U
2.3
< 0.5 U
77.3
< 0.1 U
1
4.83
12/2/2016
< 100 U
< 0.5 U
< 0.1 U
47.2
0.0193
< 50 U
< 0.08 U
1.5
< 0.1 U
0.351
< 50 U
< 0.1 U
< 5 U
0.091
< 0.5 U
< 0.5 U
< 0.5 U
91
< 0.1 U
0.7
< 10 U
2/9/2017
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
3142017
<1000
<0.50U
0.0521
44.3
0.0483
<50.0U
<0.080U
1.73
<0.10U
0.471
<50.0U
<0.10U
<5.0U
<0.20U
0.24)
0.52
<0.50U
86.7
<0.10U
0.681
<10.0U
2/7/2011
6/1/2011
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
-
--
10/5/2011
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
2/8/2012
--
--
--
--
--
--
--
--
--
-'
--
--
--
--
--
--
6/6/2012
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
10/4/2012
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
-'
--
2/6/2013
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
652013
<1U
<1U
43
<50U
<1U
<5U
<5U
<l0U
<1U
<5U
<0.05U
<5U
<lU
<SU
10/1/2013
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
2/6/2014
-
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
-
6/4/2014
--
--
--
--
--
--
--
--
--
--
--
--
--
10/8/2014
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
2/4/2015
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
5/8/2015
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
7/10/2015
< 100 U
0.413
0.23 J+
39
< 0.2 U
< 50 UJ
0.0311
0.64
< 0.5 U
0.791+
< 50 U
0.0671+
< 5 U
< 0.2 U
0.421+
0.421
< 0.5 U
180
0.0493+
2.6
4.11+
9/30/2015
< 100 U
0.33 3
< 0.5 U
39
< 0.2 U
< 50 U
< 0.08 U
2.8
0.22 J
0.783
271
< 0.1 U
8.8
< 0.2 U
1
8.6
< 0.5 U
190
< 0.1 U
2.5
16
12/11/2015
< 100 U
< 0.5 U
< 0.5 U
40
< 0.2 U
< 50 U
< 0.08 U
1.31+
< 0.5 U
6.61+
< 50 U
0.73
< 5 U
< 0.2 U
0.291
13+
< 0.5 U
180
< 0.1 U
2.7
4.61
3/15/2016
< 100 U
< 0.5 U
0.058 J
37
< 0.1 U
< 50 U
< 0.08 U
0.681+
< 0.1 U
0.32 ]
< 50 U
< 0.1 U
< 5 U
< 0.2 U
0.32)
< 0.5 U
< 0.5 U
170
< 0.1 U
2.3
< 10 U
6/22/2016
< 100 U
< 0.5 U
0.11
37.6
0.014 J
< 50 U
< 0.08 U
0.51
0.045 ]
1.1
36.6 J
< 0.1 U
< 5 U
< 0.2 U
0.31 ]
1.3
< 0.5 U
178
< 0.1 U
2.9
< 10 U
1222016
<1000
<0.5U
0.0651
41.5
<O.lU
<500
<0.08U
0.451
<0.1U
0.433
<50U
<0.1U
<5U
0.091)
0.341
<0.5U
<0.5U
198
<O.1U
2.5
<l0U
3 14 2017
< 100 U
< 0.50 11
0.077 ]
43.0
0.012 J
< 50.0 U
< 0.080 U
0.77
< 0.10 U
0.58 J
< 50.0 U
< 0.10 U
< 5.0 U
< 0.20 U
0.32 J
< 0.50 U
< 0.50 U
202
0.020 J
2.8
< 10.0 U
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)
-- - Not Analyzed
< - concentration not detected at or above
the adjusted reporting limit.
D - Dissolved
NTU - Nephelometric turbidity unit
Deg C - Degrees Celsius
ORP - Oxidation -Reduction Potential
DO - Dissolved oxygen
S.U. - Standard Unit
J- - Estimated concentration, biased low.
Spec Cord - Specific Conductance
J - Laboratory estimated concentration.
T - Total
J+ - Estimated concentration, biased high.
Temp - Temperature
mg/L - Milligrams per liter
U - Results not detected at concentrations which equal the laboratory's method reporting limit.
my - Millivolts
ug/L - Micrograms per liter
N- Normal
umhos/cm - Micro mhos per centimeter
NE - Not established
'PPBCs - Proposed Provisional Background
Concentrations provided are those reported in Table 2-2 of the Corrective Action Plan Part 1, Marshall Steam Station Ash Basins (HDR, 2016)
1 - Total Hardness values for background groundwater
locations were calclulated using calcium and magnesium fractions (Ref: http://www.water.ncsu.edu/watemhedss/info/hardness.htmi, accessed on July 12, 2016)
Prepared by: DMV Checked by: TDP
Page 6 of 6

Unpermitted Discharge Corrective Action Plan
Marshall Steam Station
APPENDICES
(ON CD)
Appendix A: Natural Resources Technical Report
Appendix B: Jurisdictional Wetlands and Streams
Preliminary Plat
Appendix C: Historical USGS Topographic Maps
June 15, 2017