GW Assessment Plan_20140901

Groundwater Assessment Work Plan September 2014
L.V. Sutton Energy Complex SynTerra

TABLE OF CONTENTS
SECTION PAGE
Executive Summary
1.0 Introduction ..................................................................................................................... 1
2.0 Site History and Source Characterization .................................................................. 3
2.1 Plant Description ........................................................................................................ 3
2.2 Ash Management Area ............................................................................................. 3
2.3 Groundwater Monitoring System ........................................................................... 4
3.0 Receptor Information ..................................................................................................... 6
4.0 Regional Geology and Hydrogeology ........................................................................ 8
5.0 Site Geology and Hydrogeology ................................................................................ 10
6.0 Groundwater Monitoring Results ............................................................................. 11
6.1 Groundwater Analytical Results ........................................................................... 11
6.2 Preliminary Statistical Evaluation Results ........................................................... 11
7.0 Assessment Work Plan ................................................................................................. 13
7.1 Anticipated Ash Basin Boring Locations .............................................................. 13
7.2 Anticipated Soil Boring Locations ......................................................................... 14
7.2.1 Inside Ash Basins ............................................................................................... 14
7.2.2 Outside Ash Basins ............................................................................................ 14
7.3 Anticipated Sediment and Surface Water Locations .......................................... 14
7.4 Anticipated Groundwater Monitoring Wells and Piezometers ........................ 14
7.4.1 General Construction, Development, Aquifer Testing ................................. 15
7.4.2 Background Wells .............................................................................................. 16
7.4.3 Ash Management Area ..................................................................................... 17
7.4.4 Downgradient Assessment Areas ................................................................... 17
7.4.5 Groundwater Sampling .................................................................................... 18
7.5 Influence of Pumping Wells on Groundwater System ....................................... 18
7.6 Site Conceptual Model ............................................................................................ 18
7.7 Development of Groundwater Computer Model ............................................... 18
8.0 Implementation Schedule and Report Submittal ................................................... 20
9.0 References ....................................................................................................................... 22

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List of Figures
Figure 1 - Site Location Map
Figure 2 - Site Layout
Figure 3 - Geology Map
Figure 4 - Anticipated Sample Locations

List of Tables
Table 1 - Summary of Concentration Ranges for Constituents Detected Greater Than
2L Standards
Table 2 - Groundwater Assessment Parameter List
Table 3 - Assessment Sample Plan

List of Appendices
Appendix A - NCDENR Letter of August 13, 2014

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EXECUTIVE SUMMARY
Duke Energy Progress, Inc. (Duke Energy) owns and operates the L.V. Sutton Energy
Complex (Sutton Plant) located on approximately 3,300 acres near Wilmington, North
Carolina. The Sutton Plant is located along the east bank of the Cape Fear River
northwest of Wilmington and west of US Highway 421. The Sutton Plant started
operations in 1954 and consisted of three coal-fired boilers that primarily used
bituminous coal as fuel to produce steam. The Sutton Plant ceased burning coal in
November 2013 and switched to burning natural gas to generate power. The facility no
longer generates coal ash.
The discharges from the cooling pond and the ash basins is permitted by the North
Carolina Department of Environment and Natural Resources (NCDENR) Division of
Water Resources (DWR) under the National Pollution Discharge Elimination System
(NPDES) Permit NC0001422.
In a letter dated August 13, 2014, the DWR issued a Notice of Regulatory Requirements
(NORR) to Duke Energy pursuant to Title 15A North Carolina Administrative Code
Chapter 02L.0106. The NORR stipulates that for each coal-fueled Plant owned, Duke
Energy will conduct a comprehensive site assessment (CSA) that includes a
Groundwater Assessment Work Plan (Work Plan) and a receptor survey. This work
plan has also been prepared to fulfill the requirements stipulated in Coal Ash
Management Act 2014 – North Carolina Senate Bill 729 (August, 2014).
The following assessment plan anticipates:
• Implementation of a receptor survey to identify water supply wells, public water
supplies, surface water bodies, and wellhead protection areas (if present) within a
0.5 mile radius of the Sutton Plant waste compliance boundary;
• Installation of borings within the ash basins for chemical and geotechnical analysis
of residuals and in-place soils;
• Installation of background soil borings;
• Installation of monitoring wells and piezometers;
• Collection and analysis of groundwater samples from existing site wells and newly
installed monitoring wells;
• Statistical evaluation of groundwater analytical data; and

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• Development of a groundwater model to evaluate the long term fate and transport
of constituents of concern in groundwater associated with the ash management
units.
The information obtained through this Work Plan will be utilized to prepare a
Comprehensive Site Assessment (CSA) report in accordance with the Notice of
Regulatory Requirements (NORR). In addition to the components listed above, a
human health and ecological risk assessment will be conducted. This assessment will
include the preparation of a conceptual site model illustrating potential pathways from
the source to possible receptors.
During the CSA process if additional investigations are required, NCDENR will be
notified.

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1.0 INTRODUCTION
Duke Energy Progress, Inc. (Duke Energy) owns and operates the L.V. Sutton Energy
Complex (Sutton Plant) located on approximately 3,300 acres near Wilmington, North
Carolina. The Sutton Plant is located along the east bank of the Cape Fear River
northwest of Wilmington and west of US Highway 421. The site is shown on Figure 1.
The Sutton Plant started operations in 1954 and consisted of three coal-fired boilers that
primarily used bituminous coal as fuel to produce steam. Ash generated from the coal
combustion was stored on-site originally in the 'ash disposal area' and then in the 1971
ash basin (old ash basin) and followed by the 1984 ash basin (new ash basin) (Figure 2).
These ash storage areas are referred to as the ash management area. The Sutton Plant
ceased burning coal in November 2013 and switched to burning natural gas to generate
power. The facility no longer generates coal ash.
The discharge from the cooling pond and the ash basins is permitted by the North
Carolina Department of Environment and Natural Resources (NCDENR) Division of
Water Resources (DWR) under the National Pollution Discharge Elimination System
(NPDES) Permit NC0001422.
Groundwater monitoring has been performed in accordance with the conditions of the
NPDES Permit # NC0001422. The current groundwater monitoring program for the
Sutton Plant includes the sampling of 17 compliance monitoring wells. Two additional
wells have been added to the routine sampling on a voluntary basis since November
2013. The 19 wells comprising the current monitoring well network at Sutton include
two (2) background wells, 15 downgradient compliance wells, and two voluntarily
monitored wells. The locations of the monitoring wells, the waste boundary, and the
compliance boundary are shown on Figure 2.
The compliance boundary for the Plant is defined in accordance with NCAC Title 15A
Chapter 02L.0107(a) (T15 A NCAC 02L .0107(a)) as being established at either 500 feet
from the waste boundary or at the property boundary, whichever is closest to the waste.
In a Notice of Regulatory Requirements (NORR) letter dated August 13, 2014, the DWR
of the NCDENR requested that Duke Energy prepare a Groundwater Assessment Plan
to conduct a Comprehensive Site Assessment (CSA) in accordance with 15A NCAC 02L
.0106(g) to address groundwater constituents detected at concentrations greater than 2L
Standards at the compliance boundary. A summary of these concentrations is provided
in Table 1 and a copy of the DWR letter is provided in Appendix A.
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SynTerra has prepared this Groundwater Assessment Work Plan on behalf of Duke
Energy to fulfill the NORR and to satisfy the requirements of NC Senate Bill 729 as
ratified August 2014.
Specifically, this document describes the plans to meet the requirements of 15A NCAC
02L .0106(g) including;
• Identify the source and cause of contamination;
• Identify any imminent hazards to public health and safety and actions taken to
mitigate them in accordance to 15A NCAC 02L .0106(f);
• Identify receptors and significant exposure pathways;
• Determine the horizontal and vertical extent of soil and groundwater
contamination and significant factors affecting contaminant transport; and
• Determine geological and hydrogeological features influencing the movement,
chemical, and physical character of the contaminants.
The information obtained through this Work Plan will be utilized to prepare a CSA
report in accordance with the requirements of the NORR. In addition to the
components listed above, a human health and ecological risk assessment will be
conducted. This assessment will include the preparation of a conceptual site model
illustrating potential pathways from the source to possible receptors.
During the CSA process if additional investigations are required, NCDENR will be
notified.
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2.0 SITE HISTORY AND SOURCE CHARACTERIZATION
2.1 Plant Description
The Sutton Plant is a former coal‐fired electricity‐generating facility located in New 
Hanover County, North Carolina, near the City of Wilmington.  The location of the 
Plant is shown on Figure 1.  The Sutton Plant started operations in 1954. 
As of November 2013, all of the coal‐fired units were retired when a new, natural gas‐
fired combined‐cycle unit began operation.  The facility is located northwest of 
Wilmington on the west side of Highway 421.  The topography around the property is 
relatively gentle, generally sloping downward toward the Cape Fear River. 
The Sutton Plant utilizes an approximate 1,100‐acre cooling pond located adjacent to the 
Cape Fear River.  The ash management area is located adjacent to the cooling pond, 
north of the Plant, as shown on Figure 2.   
2.2 Ash Management Area
The Plant, cooling pond and ash management area are located on the east side of the 
Cape Fear River.  The ash management area is located adjacent to the cooling pond, 
north of the Plant, as shown on Figure 2.  The ash management area consists of: 
 A former ash disposal area located south of the ash basins, on the south side of 
the canal;  
 An ash basin built in approximately 1971 (old ash basin); and 
 A clay‐lined ash basin built in approximately 1984 (new ash basin) located 
toward the northern portion of the ash management area. 
The ash basins are impounded by an earthen dike.  The ash basin system was an 
integral part of the Plant’s wastewater treatment system which received inflows from 
the ash removal system, Plant yard drain sump, and stormwater flows.  During coal‐
fired electrical generation, inflows to the ash basins were highly variable due to the 
cyclical nature of operations.  The Sutton Plant NPDES permit authorizes the discharge 
of cooling pond blowdown, recirculation cooling water, non‐contact cooling water and 
treated wastewater from Internal Outfalls 002, 003 and 004 via Outfall 001 from the 
cooling pond to the Cape Fear River.  The 500 foot compliance boundary circles the ash 
basins and former ash disposal area (Figure 2). 
Groundwater Assessment Work Plan September 2014
L.V. Sutton Energy Complex SynTerra

2.3 Groundwater Monitoring System
The current groundwater compliance monitoring program for the Sutton Plant includes
the sampling of 17 wells. Two additional wells have been added to the routine
sampling on a voluntary basis since November 2013.
The 19 wells comprising the current monitoring well network at Sutton Plant include
two (2) background wells, 15 downgradient wells, and two voluntarily monitored wells.
The locations of the monitoring wells, the waste boundary, and the compliance
boundary are shown on Figure 2.
Based on water levels measured at the site, the general direction of groundwater flow is
radial, away from the ash management area. The site wells provide monitoring data for
the groundwater adjacent to and downgradient of the ash management area to the
north, east, and south.
Monitoring wells MW-4B, MW-7C, MW-28B, and MW-28C document groundwater
quality to the south of the ash management area. MW-4B is currently the designated
background well for the southern area. However, road construction associated with the
I-140 extension is ongoing in the area and MW-4B will be properly abandoned and
replaced in the near future. An alternate location to the south is being evaluated.
The compliance boundary well for the north side of the ash management area is MW-
27B, with MW-5C serving as the northern background monitoring well.
Eight wells (MW-19, MW-21C, MW-22B, MW-22C, MW-23B, MW-23C, MW-24B, and
MW-24C) are located within the eastern compliance boundary. Three wells, MW-11,
MW-12, and MW-31C, are located beyond the compliance boundary, close to the
eastern property line.
Wells MW-32C and MW-33C, which are voluntarily monitored, are also located toward
the eastern property line.
In accordance with the current NPDES permit, the monitoring wells are sampled three
times per year in March, June, and October. The analytical results for the compliance
monitoring program are compared to the 2L Standards or site-specific background
concentrations. A summary of the NPDES monitoring requirements is provided below.

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NPDES Groundwater Monitoring Requirements
Well
Nomenclature Parameter Description Frequency
Monitoring Wells
MW-4B, MW-5C, MW-
7C, MW-11, MW-12,
MW-19, MW-21C, MW-
22B, MW-22C, MW-
23B, MW-23C, MW-
24B, MW-24C, MW-
27B, MW-28B, MW-
28C, and MW-31C
Antimony Chromium Nickel Thallium
March, June,
and October
Arsenic Copper Nitrate Water Level
Barium Iron pH Zinc
Boron Lead Selenium
Cadmium Manganese Sulfate
Chloride Mercury TDS

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3.0 RECEPTOR INFORMATION
The August 13, 2014 NORR states:
No later than October 14th, 2014 as authorized pursuant to 15A NCAC 02L.0106(g),
the DWR is requesting that Duke perform a receptor survey at each of the subject
facilities and submitted to the DWR. The receptor survey is required by 15A NCAC 02L
.0106(g) and shall include identification of all receptors within a radius of 2,640 feet
(one-half mile) from the established compliance boundary identified in the respective
National Pollutant Discharge Elimination System (NPDES) permits. Receptors shall
include, but shall not be limited to, public and private water supply wells (including
irrigation wells and unused or abandoned wells) and surface water features within one-
half mile of the facility compliance boundary. For those facilities for which Duke has
already submitted a receptor survey, please update your submittals to ensure they meet
the requirements stated in this letter and referenced attachments and submit them with
the others. If they do not meet these requirements, you must modify and resubmit the
plans.
The results of the receptor survey shall be presented on a sufficiently scaled map. The
map shall show the coal ash facility location, the facility property boundary, the waste
and compliance boundaries, and all monitoring wells listed in the respective NPDES
permits. Any identified water supply wells shall be located on the map and shall have the
well owner's name and location address listed on a separate table that can be matched to
its location on the map.
In accordance with the requirements of the NORR, SynTerra is in the process of
conducting a receptor survey to identify water supply wells, public water supplies,
surface water bodies, and wellhead protection areas (if present) within a 0.5 mile radius
of the Sutton Plant compliance boundary. The compliance boundary for groundwater
quality, in relation to the ash basin, is defined in accordance with 15A NCAC 02L
.0107(a) as being established at either 500 feet from the waste boundary or at the
property boundary, whichever is closer to the source. The receptors include public and
private water supply wells (including irrigation wells and unused or abandoned wells)
and surface water features within a 0.5-mile radius of the Sutton Plant compliance
boundary.
The survey consists of a review of publicly available data from NCDENR Department
of Environmental Health (DEH), NC OneMap GeoSpatial Portal, DWR Source Water
Assessment Program (SWAP) online database, Cape Fear Public Utility Authority
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(CFPUA), Environmental Data Resources, Inc. (EDR) Records Review, the USGS
National Hydrography Dataset (NHD), as well as a vehicular survey along public roads
located within 0.5 mile radius of the compliance boundary.
Additional receptor information will be collected as part of the anticipated assessment
to comply with the CSA guidelines (NCDENR August 2014).

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4.0 REGIONAL GEOLOGY AND HYDROGEOLOGY
According to the Geologic Map of North Carolina, published by the North Carolina
Department of Natural Resources and Community Development (1985), the Sutton
Plant lies within the Coastal Plain Physiographic Province.
The North Carolina Coastal Plain is approximately 90 to 150 miles wide from the
Atlantic Ocean westward to its boundary with the Piedmont province. Two natural
subdivisions of the Coastal Plain were described by Stuckey (1965): the Tidewater
region and the Inner Coastal Plain. The Plant is located within the Tidewater region,
which consists of the coastal area where large streams and many of their tributaries are
affected by ocean tides (Winner, Jr. and Coble, 1989). The Sutton Plant is located on the
east side of the Cape Fear River within the alluvial plain between the coastal dunes and
the interior uplands (NUS Corporation, 1989).
The Coastal Plain comprises a wedge shaped sequence of stratified marine and non-
marine sedimentary rocks deposited on crystalline basement. The sedimentary
sequences range in age from recent to lower Cretaceous (Narkunas, 1980).
In the eastern part of the North Carolina Coastal Plain, groundwater is obtained from
the surficial, Castle Hayne, and Peedee aquifers (Figure 3). The Coastal Plain
groundwater system consists of aquifers comprised of permeable sands, gravels, and
limestone separated by confining units of less permeable material.
Unconformably, underlying the surficial aquifer, which has an average thickness of 35
feet, is the Castle Hayne confining unit, with an average thickness of 20 feet. The Castle
Hayne aquifer is composed of fine-grained sand interbedded with gray shell limestone
and shell fragments. Sand beds contain varying amounts of dark green weathered
glauconite. Shells are common throughout the aquifer. The average thickness of the
aquifer is 60 feet in the northern Wilmington area.
In the Wilmington area, the Peedee confining unit has an average thickness of 10 feet.
The Peedee Formation, which underlies the Upper Castle Hayne Formation, contains
fine to medium grained sand interbedded with gray to black marine clay and silt. Sand
beds are commonly gray or greenish gray and contain varying amounts of glauconite.
Thin beds of consolidated calcareous sandstone and impure limestone are interlayered
with the sands in some places.
According to Winner, Jr. and Coble (1989), the surficial aquifer consists primarily of fine
sands, clays, shells, peat beds, and scattered deposits of coarse-grained material in the
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form of relic beach ridges and floodplain alluvium. The areal extent of the surficial
aquifer in the Coastal Plain is approximately 25,000 square miles with an average
thickness of 35 feet. The average estimated hydraulic conductivity is 29 feet per day
(Winner, Jr. and Coble, 1989).
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5.0 SITE GEOLOGY AND HYDROGEOLOGY
Based on monitoring well logs, the surficial aquifer at the Plant consists generally of
brown to tan poorly graded sand; with gray, well to poorly graded sand at depth, with
indications of gray clay lenses and fine gravel. The boring logs do not indicate that the
Castle Hayne confining unit was encountered during drilling activities, indicating that
in the Sutton Plant area, the surficial aquifer is at least 50 feet thick.
The surface of groundwater at the Sutton Plant is typically located at depths of less than
2 feet below land surface (BLS) to greater than 20 feet BLS based on topography. An
average transmissivity value of 11,000 square feet per day (ft2/day) was estimated by
Heath (1989) for the surficial sand aquifer in the region. Based on the results of work
conducted by others (BBL, 2004), the average linear groundwater flow velocity near the
Sutton site area ranges from 109 to 339 feet per year.
Water level maps for the site indicate the general direction of groundwater flow
appears to be radial from the ash management area with flow toward the north, east,
and south. However, the water level elevation of the cooling pond is lower than the
groundwater elevation measured in a number of nearby monitoring wells, indicating a
component of groundwater flow from the ash management area would also be toward
the west.

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6.0 GROUNDWATER MONITORING RESULTS
6.1 Groundwater Analytical Results
The routine analytical data indicates that elevated concentrations of a number of metals
and inorganic constituents, including arsenic, boron, iron, manganese, and pH are
routinely detected within the ash management area wells. The concentration ranges for
these constituents are provided in Table 1. The greatest number of elevated
concentrations occurs east and southeast of the ash management area. Monitoring wells
north of the ash management area (MW-11, MW-10, and MW-8) indicate elevated
concentrations of iron, manganese, and pH only (Table 1). In addition, shallow water
table wells southeast of the ash management area (MW-22B, MW-28B) also only
indicate elevated concentrations of iron, manganese, and pH, while the paired deeper
wells (MW-22C and MW-28C) indicated a wider range of elevated metals (Table 1).
Several inorganic parameters, such as cadmium, lead, selenium, and total dissolved
solids (TDS) have been detected in at least one background or compliance boundary
well at concentrations greater than the 2L Standard. However, many of these
constituents have not been detected at an elevated concentration with regularity and are
believed to be related to sample turbidity or represent data outliers, with the exception
of selenium at well MW-27B, which has been detected at a concentration greater than
the 2L Standard during each sampling event since October 2011.
6.2 Preliminary Statistical Evaluation Results
As a preliminary evaluation tool, statistical analysis was conducted on the groundwater
analytical data. The statistical analysis was conducted in accordance with US EPA,
Statistical Training Course for Ground Water Monitoring Data Analysis, EPA530-R-93-003,
1992 and US EPA’s Statistical Analysis of Groundwater Monitoring Data at RCRA Facilities;
Unified Guidance EPA 530/R-09-007, March 2009.
An inter-well prediction interval statistical analysis was utilized to evaluate the
groundwater data. The inter-well prediction interval statistical evaluation involves
comparing background well data to the results for the most recent sample date from
compliance boundary wells.
Monitoring well MW-4B is the background well for the southern portion of the
monitoring well network and well MW-5C is considered the background well for the
northern portion of the network. Four wells (MW-7C, MW-11, MW-12, and MW-31C)
are located beyond the compliance boundary. The remaining 11 wells are considered
compliance boundary wells. Statistical analysis was performed on the inorganic
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constituents with detectable concentrations for the most recent routine sampling event
(June 2014).
The statistical analysis indicated statistically significant increases (SSIs) over
background concentrations for a number of constituents, including arsenic, barium,
boron, iron, manganese, nickel, selenium, sulfate, zinc, and TDS.
Barium was indicated to be an SSI at well MW-7C, MW-11, MW-19, MW-21C, MW-22C,
and MW-31C, but has not been detected at a concentration greater than the 2L
Standard. Likewise, nitrate has not been detected above the 2L Standard, but was
detected as an SSI at wells MW-7C, MW-11, MW-23B, MW-27B, MW-28B, and MW-28C.
Boron, which has been detected at a concentration greater than the 2L Standard, was
indicted to be an SSI at wells MW-7C, MW-12, MW-19, MW-21C, MW-22C, MW-23B,
MW-23C, MW-24B, MW-24C, MW-27B, MW-28C, and MW-31C. Iron has been detected
at concentrations greater than the 2L Standard at most of the monitoring wells, but was
only detected as an SSI at well MW-21C. Manganese has also been detected at an
elevated concentration at most of the monitoring wells, but only detected as an SSI at
wells MW-21C, MW-22C, MW-23C, MW-24C, and MW-31C.
A more robust statistical analysis will be completed as part of the CSA using data from
additional background wells.

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7.0 ASSESSMENT WORKPLAN
The scope of work discussed in this plan is designed to meet the requirements of 15A
NCAC 02L .0106(g) and to;
• Identify the source and cause of contamination;
• Identify any imminent hazards to public health and safety and actions taken to
mitigate them in accordance to 15A NCAC 02L .0106(f);
• Identify all receptors and significant exposure pathways;
• Determine the horizontal and vertical extent of soil and groundwater
contamination and all significant factors affecting contaminant transport; and
• Determine geological and hydrogeological features influencing the movement,
chemical, and physical character of the contaminants.
The following sections generally describe anticipated assessment activities to fill data
gaps associated with the source, vertical and horizontal extent, in soil and groundwater,
for the constituents with elevated groundwater concentrations. The assessment may be
iterative with possible additional assessment activities prior to the preparation of the
CSA. Groundwater samples collected will be analyzed for the constituents listed in
Table 2. The following activities are anticipated at this time.
7.1 Anticipated Ash Basin Boring Locations
Based on assessment data available from previous studies at the Sutton Plant, two
borings are anticipated within the ash management area to determine the thickness of
ash as well as to determine the current residual saturation. No additional borings are
anticipated in the new ash basin at this time since the basin has a clay liner. The
anticipated boring locations are shown on Figure 4.
The borings may be conducted using Direct Push Technology (DPT) or Roto-Sonic
drilling (or similar methods), to provide continuous soil cores through ash and into the
underlying native soil. Drilling will be extended to approximately 20 feet below the
bottom of the ash, or to the top of the confining unit, to allow for characterization of the
underlying native soil.
Ash samples will be collected for laboratory analysis of total metals and SPLP metals.
To characterize the variation in ash composition, two samples, a shallow and a deep, are
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anticipated at each location, if the ash thickness is less than 20 feet. If the thickness is
greater than 20 feet, three samples (shallow, intermediate, and deep), will be collected.
A summary of the boring details is provided in Table 3. The depths at which the
samples are collected will be noted on sample IDs.
7.2 Anticipated Soil Boring Locations
7.2.1 Inside Ash Basins
As discussed above, continuous soil sample drilling techniques may be used to
conduct borings within the active ash basin. These borings are anticipated to
extend to a depth of approximately 20 feet below the ash, or the top of the
confining unity, to characterize the native material below the ash management
area.
Soil samples are anticipated at each of the boring locations immediately below
the ash and at the bottom of the borings to provide information on the vertical
distribution of metals beneath the basin. The soil samples will be analyzed for
total metals, SPLP metals, and geotechnical parameters. A summary of the
anticipated boring details is provided in Table 3.
Following soil sample collection, the borings will be abandoned by filling with a
bentonite-grout mixture or may be converted to a piezometer to measure
groundwater fluctuations beneath the active ash basin.
7.2.2 Outside Ash Basins
Based on assessment data available from previous studies at the Sutton Plant, no
borings are anticipated outside of the ash management area. However, after a
thorough review of available data is completed, one or more borings may be
completed to address data gaps, if identified.
7.3 Anticipated Sediment and Surface Water Locations
Seeps have not been identified at the Sutton Plant. Surface water and sediment samples
are not anticipated at this time.
7.4 Anticipated Groundwater Monitoring Wells and Piezometers
A number of monitoring wells and piezometers are present at the site. These existing
wells will be supplemented with additional wells to complete the CSA.
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7.4.1 General Construction, Development, Aquifer Testing
Monitoring wells and piezometers will be constructed by North Carolina-
licensed well drillers. Drilling equipment will be decontaminated prior to use at
each location using a high pressure steam cleaner.
Monitoring wells will be constructed of 2-inch ID, National Sanitation
Foundation (NSF) grade polyvinyl chloride (PVC) (ASTM 2012a,b) schedule 40
flush-joint threaded casing and 0.010-inch machine-slotted pre-packed screens
appropriately sized sand for a gravel pack around the screen. Piezometers will
be constructed of 1-inch ID, NSF Schedule 40 PVC flush-joint threaded casing
and pre-packed screens.
Monitoring wells will be installed as nested Type II wells or as single wells.
Nested wells will consist of a shallow well installed with the top of the well
screen approximately 5 feet below the water table. The deeper well will be
installed to a depth of approximately 50 feet below land surface, which is just
above the shallow confining unit and consistent with existing deep monitoring
wells at the Plant. Additional single deep wells may be paired with existing
monitoring wells and installed below the first confining unit. This will provide
information on the vertical distribution of aquifer characteristics (chemistry and
aquifer parameters) as well was determining the magnitude of vertical hydraulic
gradients.
For nested Type II wells, the well screen intervals will typically be a 10 foot
length for the shallow well and a 5 foot length for the deeper well. The deeper of
the nested wells will be installed first. The single wells will also be installed with
5 foot screen length. The monitoring well will be constructed in accordance with
15A NCAC 02C (Well Construction Standards).
The monitoring wells will be completed with either steel above ground
protective casings with locking caps or steel flush-mount manholes with locking
expansion caps, and well tags. The protective covers will be secured and
completed in a concrete collar and 2-foot square concrete pad.
Piezometers will be installed in a similar manner, but with 1-inch ID, NSF
Schedule 40 PVC flush-joint threaded casing and pre-packed screens. A
pelletized bentonite seal will be placed above the filter pack and the remainder of
the annular space will be filled with a neat cement grout from the top of the
upper bentonite seal to near ground surface. The piezometers will be completed
with either steel above ground protective casings with locking caps or steel flush-
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mount manholes with locking expansion caps, and well tags. The protective
covers will be secured and completed in a concrete collar and 1-foot square
concrete pad.
Following installation, the monitoring wells will be developed in order to
remove drill fluids, clay, silt, sand, and other fines which may have been
introduced into the formation or sand pack during drilling and well installation,
and to establish communication of the well with the aquifer. Well development
will be performed using a portable submersible pump, which will be repeatedly
moved up and down the well screen interval until the water obtained is
relatively clear. Development will be continued by sustained pumping until
monitoring parameters (e.g., conductivity, pH, temperature) are generally
stabilized; estimated quantities of drilling fluids, if used, are removed; and,
turbidity decreases to acceptable levels.
After the wells have been developed, hydraulic conductivity tests (rising head
slug tests) will be conducted on each of the wells. The slug tests will be
performed in accordance with ASTM D4044-96 Standard Test Method (Field
Procedure) for Instantaneous Change in Head (Slug) Tests for Determining
Hydraulic Properties of Aquifers and NCDENR Performance and Analysis of
Aquifer Slug Tests and Pumping Test Policy, dated May 31, 2007.
The data obtained during the slug tests will be reduced and analyzed using
AQTESOLV™ for Windows, version 4.5, software to determine the hydraulic
conductivity of the soils in the vicinity of wells.
Data loggers may also be placed in select wells for extended periods of time to
monitor groundwater fluctuations above and below the confining unit near the
property boundary to monitor the influence of recharge from precipitation to the
aquifer system and the influence, if any, from nearby pumping wells.
7.4.2 Background Wells
Existing background wells MW-4B and MW-5C are positioned to provide
representative data for comparison with background groundwater conditions.
Therefore, no additional background wells are anticipated at this time.
However, road construction associated with the I-140 extension is ongoing in the
area and MW-4B will need to be properly abandoned and replaced. An alternate
location to the south is being evaluated.
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7.4.3 Ash Management Area
Currently, there are no piezometers installed within the ash basins to provide
residual ash saturation and the depth to groundwater information. Two
piezometer pairs (APZ-4S/D and APZ-5S/D) are anticipated to be installed, one
within the old ash basin and one within the former ash disposal area, to provide
vertical hydraulic gradient information and monitor residual saturation in the
ash. The piezometers are anticipated to be installed at the locations of ash
borings AB-4 and AB-5.
A shallow piezometer, screened at the base of the ash, will be used to monitor
residual saturation. A deeper piezometer, screened approximately 20 feet below
the basin, will be used to monitor groundwater levels below the basin.
7.4.4 Downgradient Assessment Areas
A preliminary review of site data and existing monitoring well locations indicate
that horizontal and vertical coverage around the compliance boundary is mostly
adequate to complete a CSA of the Sutton Plant with the exception of the area
along the downgradient property line.
To refine the horizontal and vertical extend to metals in the aquifer, five
additional well pairs (AW-1S/D through AW-5S/D) are anticipated to be installed
along the property line downgradient from the ash management area (Figure 4).
The wells will be installed as well pairs to also provide vertical information on
aquifer chemistry and vertical gradients. Two deep single wells (AW-6D and
AW-7D) may be installed below the first confining unit and located adjacent to
existing wells MW-12 and MW-31C, which are installed above the confining unit.
A summary of the boring details is provided in Table 3. Based on the analytical
results from AW-6D and AW-7D, additional wells may be installed below the
confining unit.
In addition to the background wells, sentinel well pairs (SW-1S/D through SW-
6S/D) are anticipated to be installed at the locations shown on Figures 4. The
sentinel wells are anticipated to be located on off-site property not owned by
Duke Energy and will require access permission for well installation and
monitoring. The sentinel wells will be used to monitor groundwater conditions
between nearby receptors and the property boundary for the Sutton Plant.
The approximate locations of the additional monitoring wells are shown on
Figure 4. A summary of the boring details is provided in Table 3.
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7.4.5 Groundwater Sampling
It is anticipated that groundwater samples will be collected using a low-flow
sampling technique consistent with compliance monitoring well sampling
protocol. The groundwater samples will be analyzed for the parameters listed in
Table 2. Total and dissolved metals analysis will be conducted. In addition to
the groundwater samples collected from the new monitoring wells, it is
anticipated that groundwater samples will be collected from one or more of the
existing site monitoring wells and on-site wells used for Sutton Plant operation.
A summary of the anticipated groundwater samples is included in Table 3.
During groundwater sampling activities, water level measurements will be made
at the existing site monitoring wells, observation wells, and piezometers, along
with the new wells. The data will be used to generate water table and
potentiometric maps of the upper and lower portions of the surficial aquifer
zones, as well as to determine the degree of residual saturation beneath the ash
basins.
7.5 Influence of Pumping Wells on Groundwater System
There are several public and private water supply wells located within a 0.5 mile radius
of the compliance boundary for the ash management area. Several of these wells are
located close to the compliance boundary. The wells appear to be located
downgradient from the ash management area. Data loggers may be installed in one or
more of the site monitoring wells/piezometers to monitor groundwater fluctuations that
may be a result of nearby pumping wells. Additional information on the potential off-
site water supply wells will also be collected as part of the assessment.
7.6 Site Conceptual Model
Existing and new hydrogeological data will be used to develop a Site Conceptual Model
(SCM). The SCM will be developed in accordance with “Evaluating Metals in
Groundwater at DWR Permitted Facilities” (July 2012) and the May 31, 2007 NCDENR
Memorandum entitled Hydrogeologic Investigation and Reporting Policy. The SCM will
define the groundwater flow systems at the site, horizontally and vertically, and
provide a better understanding of the fate and transport of constituents of concern in
groundwater. This information will be used to develop a groundwater computer
model. Figure 4 shows the proposed locations for Geologic Cross Sections anticipated
for the SCM.
7.7 Development of Groundwater Computer Model
Data from existing and new monitoring wells will be used to develop a groundwater
computer model of the system. The groundwater modeling will be conducted in
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accordance with the requirements of the May 31, 2007 NCDENR Memorandum entitled
Groundwater Modeling Policy.
At this time, it is anticipated that a numerical groundwater flow model will be
developed using the MODFLOW finite difference model that was developed by the
USGS and is one of the most widely accepted and widely used groundwater flow
models. The MODFLOW model will be created as a multi-layer flow model to better
determine the vertical flow component of the aquifer system which will allow for more
accurate fate and transport modeling. Once the model is created, it will be calibrated to
site conditions by modifying model inputs, such as hydraulic conductivity, within
established limits based on actual site data, until a reasonable match between the model
and actual site conditions is accomplished.
After the MODFLOW model is calibrated, the modeled flow data will be imported into
MT3D or RT3D and a fate and transport model will be created. MT3D and RT3D are
three-dimensional numerical solute fate and transport model, which will be used to
predict the short and long-term movement of the constituents of interest in
groundwater at the site and under the various predictive scenarios discussed above.
Due to the data requirements of the computer modelling, the computer model will be
completed after the majority of the groundwater assessment activities. The results of
the groundwater modelling are anticipated as an appendix to the CSA Report.

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8.0 IMPLEMENTATION SCHEDULE AND REPORT SUBMITTAL
Implementation will take place immediately following approval of this Groundwater
Assessment Plan by DWR. The anticipated schedule of activities and project
completion following plan approval is provided below.
• 10 days to begin field activities upon approval of plan
(Including, but not limited to, notification of public utility locate services,
road access clearing, container requests from laboratories for the soil and
groundwater samples, assemble information on existing site wells and
piezometers in addition to compliance boundary well information)
• 60 days to complete field activities
• Complete drilling activities
• Conduct slug tests
• Survey soil borings, wells, and other assessment locations
• Collect groundwater and other assessment samples
• Collect site-wide water levels
• Setup groundwater computer model
• 30 days after completion of field activities receive analytical data
• 60 days after receipt of analytical data evaluate results, conduct statistical
evaluation, prepare summary tables, develop CSM, and calibrate computer
model.
• 20 days to complete Assessment Report, per NC Senate Bill 729, August 2014.
• 90 days (up to 180 days) to complete computer modeling and Corrective Action
Plan.
• Conduct additional work as may be required to complete the CSA.
• 90 days to complete CSA preparation, review, and submittal, in accordance with
NCDENR guidance (August 2014).
Project Assumptions Include:
• No more than one iterative assessment step will be required;
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• Off-site assessment or access agreements are anticipated for the property located
to the east of the ash management area;
• Duke Energy will make a diligent effort to collect all receptor information in
accordance with NCDENR guidance (August 2014); however, it is anticipated
that all such information may not be available;
• If off-site water supply wells sampling is deemed necessary, NCDENR staff may
be requested to assist with access;
• No special permitting is anticipated;
• Data may not reflect all seasonal or extreme hydrologic conditions; and
• During the CSA process if additional investigations are required NCDENR, will
be notified;
• In addition to the components listed above, a human health and ecological risk
assessment will be conducted.

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9.0 REFERENCES
ASTM D4044-96 Standard Test Method (Field Procedure) for Instantaneous Change in
Head (Slug) Tests for Determining Hydraulic Properties of Aquifers.
BBL, 2004. Phase I Remedial Investigation Report for the Former Ash Disposal Area,
L.V. Sutton Steam Electric Plant, Wilmington, North Carolina.
Catlin Engineers and Scientists, Phase I Groundwater Quality Assessment for Ash Pond
Impacts at the L.V. Sutton Electric Plant, Wilmington, North Carolina. Catlin Project
No. 209-100, February 11, 2011.
Catlin Engineers and Scientists, Phase II Groundwater Quality Assessment for Ash Pond
Impacts at the L.V. Sutton Electric Plant, Wilmington, North Carolina. Catlin Project
No. 209-100, July 2012.
Heath, R.C., 1989. Preliminary Summary of Hydrogeologic Conditions in Vicinity of
Lake Sutton, New Hanover County, North Carolina.
Horton, J. W. and Zullo, V. A., 1991, The Geology of the Carolinas, Carolina Geological
Society Fiftieth Anniversary Volume, 406 pp.
Narkunas, J., 1980, Groundwater Evaluation in the Central Coastal Plain of North
Carolina, North Carolina Department of Natural Resources and Community
Development, 119 pp.
NCDENR Document, “Hydrogeologic Investigation and Reporting Policy
Memorandum”, dated May 31, 2007.
NCDENR Document, “Groundwater Modeling Policy Memorandum”, dated May 31,
2007.
NCDENR Document, “Performance and Analysis of Aquifer Slug Tests and Pumping
Test Policy”, dated May 31, 2007.
North Carolina Geological Survey, 1985, Geologic map of North Carolina: North Carolina
Geological Survey, General Geologic Map , scale 1:500000.
NUS Corporation 1989. Screening Site Inspection Phase I, Carolina Power and Lighting,
Sutton Steam Plant, Wilmington, New Hanover County, North Carolina, EPA
I.D. NCD000830646.
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Stuckey, J.L., 1965, North Carolina: Its Geology and Mineral Resources, Raleigh, North
Carolina Department of Conservation and Development, 550p.
Winner, M.D., Jr., and Coble, R.W., 1989, Hydrogeologic Framework of the North
Carolina Coastal Plain Aquifer System: U.S. Geological Survey Open-File
Report.
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FIGURES

PROJECT MANAGER:
LAYOUT:
DRAWN BY:
KATHY WEBB
DATE:S. ARLEDGE
FIG 1 (USGS SITE LOCATION)
2014-09-25
CONTOUR INTERVAL:
MAP DATE:
10ft
1999
APPROXIMATE ROUTE OF THE
NEW WILLMINGTON BYPASS (I-140)
148 RIVER STREET, SUITE 220
GREENVILLE, SOUTH CAROLINA
PHONE [phone]
www.synterracorp.com
SOURCE:
USGS TOPOGRAPHIC MAP OBTAINED FROM THE NRCS GEOSPATIAL DATA GATEWAY AT
http://datagateway.nrcs.usda.gov/
FIGURE 1
SITE LOCATION MAP
L.V. SUTTON ENERGY COMPLEX
801 SUTTON POWER PLANT RD
WILMINGTON, NORTH CAROLINA
LELAND AND CASTLE HAYNE
NC QUADRANGLES
RALEIGH
WILMINGTON
GREENVILLE
GREENSBORO
3000
GRAPHIC SCALE
1500
IN FEET
15000US H
IGHWAY
421
PROPERTY BOUNDARY
500' COMPLIANCE
BOUNDARY
WASTE
BOUNDARY
L.V. SUTTON ENERGY COMPLEX
NEW HANOVER COUNTY EXISTING I-140
MW-11MW-5C6000 600 1200GRAPHIC SCALEIN FEETFIG 2 (SITE LAYOUT)2014-09-25H. FRANKS. ARLEDGEPROJECT MANAGER:LAYOUT NAME:DRAWN BY:CHECKED BY:K. WEBBDATE:DATE:FIGURE 2SITE LAYOUTwww.synterracorp.com148 River Street, Suite 220Greenville, South Carolina 29601864-421-9999LEGEND2014-09-25500 ft COMPLIANCE BOUNDARYDUKE ENERGY PROGRESS SUTTON PLANTWASTE BOUNDARYBACKGROUND MONITORING WELL (SURVEYED)COMPLIANCE MONITORING WELL (SURVEYED)MW-11MW-5CL.V. SUTTON ENERGY COMPLEX801 SUTTON POWER PLANT RDWILMINGTON, NORTH CAROLINASOURCES:1. 2014 AERIAL PHOTOGRAPH WAS OBTAINED FROM WSPFLOWN ON APRIL 17, 20142. 2013 AERIAL PHOTOGRAPH WAS OBTAINED FROM THENRCS GEOSPATIAL DATA GATEWAY AThttp://datagateway.nrcs.usda.gov/3. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTHCAROLINA STATE PLANE COORDINATE SYSTEM FIPS 3200(NAD 83).4. WELL LOCATIONS AND MEASURING POINTS WERE BASEDON A SURVEY BY JAMES L. HAINES & ASSOCIATES FOR ISH,INC. DATED DECEMBER 23, 2008. ISH DRAWING IS TITLED"POTENTIAL LOCATIONS FOR PROPOSED GEOPROBE ANDWELL INSTALLATIONS", DATED FEBRUARY 25, 2009 WITH ACAD FILE NAME Figure 22.dwg5. NEW WELL LOCATIONS AND MEASURING POINTS WEREBASED ON A TABLE BY PARAMOUNTE ENGINEERING,WILMINGTON NC DATED 2012-03-05 SUPPLIED BYPROGRESS ENERGY. HORIZONTAL DATUM ISNAD83(NSRS2007) AND THE VERTICAL DATUM IS NGVD29.6. THE PROPERTY BOUNDARY FOR THE L.V. SUTTON STEAMELECTRIC PLANT WAS BASED ON A COMPOSITE MAPPREPARED BY DAVIS-MARTIN-POWELL & ASSOC., INC. THEDRAWINGS ARE DATED JUNE, 1995 WITH REVISION NOTEFOR MARCH 4, 2004. FILE NAME IS L-D-9022-7.DWG.HORIZONTAL DATUM IS NAD83 AND THE VERTICAL DATUMIS NGV 29.7. THE LOCATION OF THE FORMER ASH DISPOSAL AREASWAS BASED ON A FIGURE 2-2 PREPARED BY BLASLAND,BOUCK & LEE, INC. THE FIGURE IS TITLED "HORIZONTALEXTENT OF THE ASH WITHIN THE FORMER DISPOSALAREA".NC WILDLIFELAKE ACCESSSUTTON
LAKE
RDOLD ASHBASIN AREANEW ASHBASIN AREAFORMER ASHDISPOSAL AREAFORMER ASHDISPOSAL AREACANALCANALSOLARFARMASTCONCRETEPADCAPE FEAR RIVERSUTTON STEAM PLANT RDSUTTON LAKE RDRAILROADCOOLING POND WATER LEVEL = 9.58 ftPROVIDED BY DUKE ENERGY 04-08-2014FREDRICKSON RDMETRO
C
IRC
LECOOLING PONDCOOLING PONDNC HIGHWAY 421IN
T
E
R
S
T
A
T
E

1
4
0

(
U
S

H
I
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H
W
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Y

1
7
)
TRANSCOM
C
T
BEVEL RDROYMAC DRFREDRICKSON RDCANALEZZELLTRUCKINGLCHHOLDINGSS. T. WOOTENCORPORATIONINVISTANEW HANOVERCOUNTYSAUNDERS &SAUNDERS, LLCROYMACBUSINESSPARKROYMACPARTNERSHIPABSOLUTEPROPERTIESHURRICANEPROPERTIES
MAOLA MILK &ICE CREAM CO.MW-4BMONITORING WELL (SURVEYED)MW-32CMW-27BMW-31CMW-24CMW-24BMW-12MW-23CMW-23BMW-22CMW-22BMW-21CMW-19MW-28BMW-28CMW-7CMW-32CMW-33C
148 RIVER STREET, SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
www.synterracorp.com
PROJECT MANAGER:
LAYOUT:
DRAWN BY:
KATHY WEBB
DATE:S. ARLEDGE
FIG 3 (GEOLOGY MAP)
2014-09-25
FIGURE 3
GEOLOGY MAP
DUKE ENERGY PROGRESS
L.V. SUTTON ENERGY COMPLEX
801 SUTTON POWER PLANT ROAD
WILMINGTON, NORTH CAROLINA
COOLING POND
DISCLAIMER AND SOURCE NOTE:
The information on this map was derived from digital databases at the NC Department of Transportation Website. Care was
taken in the creation of this map. SYNTERRA cannot accept any responsibility for errors, omissions, or positional accuracy.
There are no warranties, expressed or implied, including the warranty of merchantability or fitness for a particular purpose,
accompanying this product. However, notification of any errors will be appreciated.
GEOLOGY SOURCE NOTE:
GEOLOGY SHAPEFILES OBTAINED FROM THE USGS Preliminary integrated geologic map databases for the United
States - Alabama, Florida, Georgia, Mississippi, North Carolina, and South Carolina, DATED 2007 AT
http://pubs.usgs.gov/of/2005/1323/
500 ft COMPLIANCE BOUNDARY
DUKE ENERGY PROGRESS SUTTON PLANT
WASTE BOUNDARY
MW-7C MONITORING WELL
LEGEND
LEGEND - UNIT NAME
Kp CRETACEOUS, PEEDEE FORMATION - MARINE SAND, CLAYEY SAND AND CLAY
MW-4B
MW-7C
MW-33
C
MW-32C
MW-28B
MW-28CMW-19MW-21C
MW-22CMW-22B
MW-23CMW-23B
MW-23CMW-23B
MW-24CMW-24B
MW-12
MW-31C
MW-11MW-27B
MW-5C
Kp
Kp
Kp
Kp
OLD ASH
BASIN
AREA
NEW ASH
BASIN AREA
FORMER ASH
DISPOSAL
AREA
FORMER ASH
DISPOSAL
AREA
L.V. SUTTON ENERGY COMPLEX
801 SUTTON POWER PLANT ROAD
NEW HANOVER COUNTY
WILMINGTON, NORTH CAROLINA
0H2H2GPE-SW2PE-SW4PE-SW3PE-SW5PE-SW6APE-SW6BPE-SW6DPE-SW6E8000 800 1600GRAPHIC SCALEIN FEETFIG 4 (CROSS SECTIONS) (11X17)2014-09-25H. FRANKS. ARLEDGEPROJECT MANAGER:LAYOUT NAME:DRAWN BY:CHECKED BY:K. WEBBDATE:DATE:FIGURE 4ANTICIPATED SAMPLELOCATIONSwww.synterracorp.com148 River Street, Suite 220Greenville, South Carolina 29601864-421-99992014-09-25L.V. SUTTON ENERGY COMPLEX801 SUTTON POWER PLANT RDWILMINGTON, NORTH CAROLINASOURCES:1. 2014 AERIAL PHOTOGRAPH WAS OBTAINED FROM WSP FLOWN ON APRIL 17,20142. 2013 AERIAL PHOTOGRAPH WAS OBTAINED FROM THE NRCS GEOSPATIAL DATAGATEWAY AT http://datagateway.nrcs.usda.gov/3. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATEPLANE COORDINATE SYSTEM FIPS 3200 (NAD 83).4. PARCEL DATA WAS OBTAINED FROM THE NORTH CAROLINA STATE LIBRARIES AThttp://www.lib.ncsu.edu/gis/counties.html FOR NEW HANOVER COUNTY.5. 2ft CONTOUR INTERVALS FROM NCDOT LIDAR DATED 2007https://connect.ncdot.gov/resources/gis/pages/cont-elev_v2.aspx6. WELL LOCATIONS AND MEASURING POINTS WERE BASED ON A SURVEY BYJAMES L. HAINES & ASSOCIATES FOR ISH, INC. DATED DECEMBER 23, 2008.ISH DRAWING IS TITLED "POTENTIAL LOCATIONS FOR PROPOSED GEOPROBEAND WELL INSTALLATIONS", DATED FEBRUARY 25, 2009 WITH A CAD FILE NAMEFigure 22.dwg7. NEW WELL LOCATIONS AND MEASURING POINTS WERE BASED ON A TABLE BYPARAMOUNTE ENGINEERING, WILMINGTON NC DATED 2012-03-05 SUPPLIEDBY PROGRESS ENERGY. HORIZONTAL DATUM IS NAD83(NSRS2007) AND THEVERTICAL DATUM IS NGVD29.8. THE PROPERTY BOUNDARY FOR THE L.V. SUTTON STEAM ELECTRIC PLANT WASBASED ON A COMPOSITE MAP PREPARED BY DAVIS-MARTIN-POWELL & ASSOC.,INC. THE DRAWINGS ARE DATED JUNE, 1995 WITH REVISION NOTE FOR MARCH4, 2004. FILE NAME IS L-D-9022-7.DWG. HORIZONTAL DATUM IS NAD83 ANDTHE VERTICAL DATUM IS NGV 29.9. THE LOCATION OF THE FORMER ASH DISPOSAL AREAS WAS BASED ON A FIGURE2-2 PREPARED BY BLASLAND, BOUCK & LEE, INC. THE FIGURE IS TITLED"HORIZONTAL EXTENT OF THE ASH WITHIN THE FORMER DISPOSAL AREA".NOTE:1. CONTOUR LINES ARE USED FOR REPRESENTATIVE PURPOSES ONLY AND ARENOT TO BE USED FOR DESIGN OR CONSTRUCTION PURPOSES.DUKE ENERGY PROGRESS PRODUCTIONWELL (APPROXIMATE)PE-SW2NHC-SW4CFPUA PRODUCTION WELL (APPROXIMATE)0H2INVISTA REPORTED PRODUCTION WELLLOCATIONDUKE ENERGY PROGRESSPRODUCTION WELL (SURVEYED)PE-SW2LEGENDBACKGROUND MONITORING WELL (SURVEYED)COMPLIANCE MONITORING WELL (SURVEYED)500 ft COMPLIANCE BOUNDARYDUKE ENERGY PROGRESS SUTTON PLANTWASTE BOUNDARYMW-27BPARCEL LINE (NEW HANOVER CO GIS)MW-5CMONITORING WELL (SURVEYED)MW-32CAW-3SANTICIPATED MONITORING WELL LOCATIONANTICIPATED ASH/SOIL BORING LOCATIONANTICIPATED GEOLOGIC CROSS SECTIONGENERALIZED GROUNDWATER FLOWDIRECTION•SUPPORTED BY GROUNDWATER ELEVATION DATA ORTOPOGRAPHIC DATA2007 LiDAR CONTOUR MAJOR2007 LiDAR CONTOUR MINOR120ANTICIPATED PIEZOMETER LOCATIONNC WILDLIFELAKE ACCESSOLD ASHBASIN AREANEW ASHBASIN AREAFORMER ASHDISPOSAL AREAFORMER ASHDISPOSAL AREACANALCANALASTCONCRETEPADCAPE FEAR RIVERSUTTON LAKE RDRAILROADCOOLINGPONDSUTTON LAKE
RDSOLARFARMCOOLINGPONDCOOLINGPONDSUTTON STEAM PLANT RDTRANSCOM CTROYMAC DRFREDRICKSON RDCANALACCESS ROADNHC-SW4NHC-SW3NHC-SW2(NOT IN USE)METRO C
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)FREDRICKSON RDAPPROXIMATE ROUTE OFTHE NEW WILMINGTONBYPASS (I-140)NC HIGHWAY 421NC HIGHWAY 421FLEMMING STFLEMMING DRSAMPSON STNC HIGHWAY 421CLINTON STHALES LNRAILROADRAILROADRAILROADRAILROADSAMPSON STNHC-SW1(ABANDONED)INVISTAS.T. WOOTENCFPUAFORMER FLEMINGTONLANDFILL SUPERFUNDSITE CLOSED IN-PLACEMW-4BMW-5CMW-33CMW-32CMW-27BMW-31CMW-24CMW-24BMW-23CMW-23BMW-22CMW-22BMW-19MW-21CMW-28BMW-28CMW-7CMW-11MW-12AW-1SAW-1DAW-2SAW-2DAW-3SAW-3DAW-4SAW-4DSW-1SSW-1DAW-5SAW-5DSW-2SSW-2DSW-3SSW-3DAW-6DAW-7DSW-4SSW-4DSW-5SSW-5DSW-6SSW-6D

TABLES

TABLE 1SUMMARY OF CONCENTRATION RANGES FOR CONSTITUENTS DETECTED GREATER THAN 2L STANDARDSL.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, INC., WILMINGTON, NORTH CAROLINAPARAMETER ANTIMONY ARSENIC BORON CADMIUM CHLORIDE CHROMIUM IRON LEAD MANGANESE SELENIUM SULFATE THALLIUM TDS pH2L STANDARD (eff. 4/1/2013)110700225010300155020 250 0.2 500 6.5 - 8.5Units (ug/l) (ug/l) (ug/l) (ug/l) (mg/l) (ug/l)(ug/l) (ug/l) (ug/l) (ug/l) (mg/l) (ug/l) (mg/l) SUMW-4B Background <2L <2L <2L <2L <2L <2L 50 - 9700 <2L 14 - 62 <2L <2L <2L <2L 6.0 - 7.4MW-5C Background <2L <2L <2L <2L 12 - 295 <2L 11 - 2210 <2L 111 - 602 <2L <2L <2L 47 - 500 4.9 - 6.0MW-7C Beyond CB <2L <2L 157 - 767 0.083 - 3.34 10.9 - 446 <2L 45 - 5200 <2L 60 - 458 1 - 27 <2L <2L 64 - 897 4.6 - 6.3MW-11 Beyond CB <2L <2L <2L <2L <2L <2L 17 - 4900 <2L 60 - 117 <2L <2L <2L <2L 4.0 - 5.2MW-12 Beyond CB <2L <2L 928 - 1560 <2L <2L <2L 47 - 8000 1.32 - 17.3 55 - 281 1 - 34 <2L <2L 170 - 524 4.7 - 6.6MW-19 CB <2L 0.63 - 10 850 - 2110 <2L <2L <2L 25.1 - 725 <2L 14.3 - 539 <2L <2L 0.23 - 11 293 - 500 6.2 - 6.7MW-21C CB <2L 1.25 - 28.5 1490 - 2000 <2L <2L <2L 727 - 7680 <2L 764 -1520 <2L 96 - 814 <2L 404 -511 6.4 - 7.0MW-22B CB <2L <2L <2L <2L <2L <2L 13 - 460 <2L 16 - 116 <2L <2L <2L <2L 5.1 - 7.3MW-22C CB <2L <2L 1650 - 2500 <2L <2L <2L 171 - 628 <2L 18 - 1360 <2L <2L 0.226 - 0.35 <2L 6.2 - 7.0MW-23B CB <2L <2L 394 - 1830 <2L <2L <2L <2L <2L 13 - 354 <2L <2L <2L 140 - 1990 6.1 - 6.9MW-23C CB <2L <2L 1640 - 3000 <2L <2L <2L 53.4 - 395 <2L 970 - 1630 <2L <2L <2L 335 - 540 6.0 - 6.6MW-24B CB 1.07 - 1.1 <2L 1130 - 1500 <2L <2L <2L <2L <2L 19 - 805 21.6 - 43.3 <2L 0.23 - 0.586 <2L 6.2 - 6.8MW-24C CB <2L <2L 988 - 1240 <2L <2L <2L 515 - 7450 <2L 852 - 2360 <2L <2L <0.1 - 0.23 530 - 610 5.6 - 6.1MW-27B CB <2L <2L <2L <2L <2L <2L <2L <2L 153 - 406 22.7 - 61.7 <2L <2L <2L 4.5 - 6.5MW-28B Beyond CB <2L <2L <2L <2L <2L <2L <2L <2L 14 - 89.4 <2L <2L <2L <2L <2LMW-28C Beyond CB <2L <2L 94.9 - 1260 <2L <2L <2L <2L <2L 17 - 409 <2L <2L <2L 69 - 1240 6.0 - 6.5MW-31C Beyond CB <2L <2L 985 - 1410 <2L <2L <2L 232 - 3420 <2L 220 - 2390 <2L <2L <2L 349 - 570 5.1 - 5.8MW-32C Beyond CB <2L <2L <2L <2L <2L <2L 47 - 424 <2L <2L <2L <2L <2L <2L 5.5 - 9.2MW-33C Beyond CB <2L <2L <2L <2L <2L <2L <2L <2L <2L <2L <2L <2L <2L 5.2 - 9.7MW-2C RB <2L 5.5 - 290 1600 - 2790 0.068 - 23 <2L 0.18 - 11 50 - 8050 <2L 65 - 350 0.58 - 35 <2L 0.11 - 0.71 88 - 526 5.0 - 6.9MW-6C RB <0.5 - 3 <2L 739 - 1690 <2L <2L <2L 102 - 7140 <2L 301 - 1280 1.2 - 25 <2L <2L 116 - 798 4.1 - 7.1MW-8 Beyond CB <2L <2L <2L <2L 7.2 B - 260 <2L 50 - 13000 <2L 270 - 376 <2L <2L <2L <2L 5.1 - 6.2MW-9 Beyond CB <2L <2L <2L <2L <2L <2L 16 - 4300 <2L <2L <2L <2L <2L <2L 4.7 - 6.7MW-10 Beyond CB <2L <2L <2L <2L <2L <2L 41 - 3800 <2L 84 - 86.7 <2L <2L <2L <2L 4.5 - 6.2MW-17 RB 0.33 - 4 7.1 - 41 2000 - 3060 <2L <2L <2L 386 - 2840 <2L 162 - 455 <2L <2L 0.11 - 0.38 342 - 574 6.1 - 6.6MW-18 Between WB & RB <2L 26.9 - 169 1150 - 1550 <2L 35.2 - 407 <2L 420 - 6910 <2L 215 - 266 <2L <2L <2L 358 - 1040 6.5 - 6.7Notes:Prepared by: RBI Checked by: BER B - Data flagged due to detection in field blankCB - Compliance BoundaryRB - Review BoundaryWB - Waste Boundary< 2L - Constituent has not been detected above the 2L Standard or beyond range for pHShown concentration ranges only include concentrations detected above the laboratory's reporting limitWell IDWell Location Relative to Compliance BoundaryConcentration RangePage 1 of 1P:\Duke Energy Progress.1026\ALL NC SITES\DENR Letter Deliverables\GW Assessment Plans\Sutton\Tables\Table 1 Summary Concentration Ranges Sutton.xlsx
TABLE 2
GROUNDWATER ASSESSMENT PARAMETER LIST
L.V. SUTTON ENERGY COMLPEX
DUKE ENERGY PROGRESS, INC., WILMINGTON, NORTH CAROLINA
PARAMETER UNITS FIELD EQUIPMENT/
LAB METHOD
pH SU YSI Professional Plus or YSI 556 MPS
Specific Conductivity S/cm YSI Professional Plus or YSI 556 MPS
Temperature CYSI Professional Plus or YSI 556 MPS
ORP mV YSI Professional Plus or YSI 556 MPS
Dissolved Oxygen mg/L YSI Professional Plus or YSI 556 MPS
Turbidity NTU Hach 2100Q
Antimony g/L EPA 200.8
Arsenic g/L EPA 200.8
Barium mg/L EPA 200.7
Boron mg/L EPA 200.7
Cadmium g/L EPA 200.8
Chromium g/L EPA 200.8
Copper mg/L EPA 200.7
Iron mg/L EPA 200.7
Lead g/L EPA 200.8
Manganese mg/L EPA 200.7
Mercury g/L EPA 245.1
Molydbenum g/L EPA 200.8
Nickel g/L EPA 200.8
Selenium g/L EPA 200.8
Thallium (low level)g/L EPA 200.8
Zinc mg/L EPA 200.7
Nitrate as Nitrogen mg-N/L EPA 300.0
Ferrous Iron mg/L (Field Test Kit)
Sulfate mg/L EPA 300.0
Sulfide mg/L SM 4500 Sd
Methane mg/L RSK 175
Chloride mg/L EPA 300.0
Calcium mg/L EPA 200.7
Magnesium mg/L EPA 200.7
Sodium mg/L EPA 200.7
Potassium mg/L EPA 200.7
Bromide mg/L EPA 300.1
Total Organic Carbon mg/l EPA 5310
Alkalinity (as CaCO3)mg/L SM 2320B
Total Dissolved Solids mg/L SM 2540C
Prepared by: RBI Checked by: BER
Notes:
SU - Standard Units mg/L - milligrams per liter
S/cm - microsiemens per centimeter NTU - Nephelometric Turbidity Units
C - degrees Celsius g/L - micrograms per liter
mV - millivolts mg-N/L - milligrams nitrate (as nitrogen) per liter
Field Parameters
Lab Parameters - Inorganics (Total & Dissolved)
Lab Parameters - Anions/Cations
Page 1 of 1
P:\Duke Energy Progress.1026\ALL NC SITES\DENR Letter Deliverables\GW Assessment Plans\Sutton\Tables\Table 2 GW
Assessment Parameter List Sutton.xlsx
TABLE 3
ASSESSMENT SAMPLING PLAN
L.V. SUTTON ENERGY COMPLEX
DUKE ENERGY PROGRESS, INC., WILMINGTON, NORTH CAROLINA
ASH
MANAGEMENT
AREA
BORING /
WELL ID
ESTIMATED
BORING
DEPTH
(ft bgs)
ESTIMATED
NO. OF
SAMPLES
SAMPLE
MEDIA
SAMPLE
DEPTHS/INTERVALS/
TARGET ZONES
LAB ANALYSIS PURPOSE/NOTES
AB-4 40 4 - 5
Ash
Ash
Ash
Soil
Soil
1-2'
Intermediate (if >20' thick)
Above ash/soil contact
2' Below ash/soil contact
Bottom of boring
Total metals + SPLP
Total metals + SPLP
Total metals + SPLP
Total metals + Geotech
Total metals + Geotech
Refine ash thickness, determine residual
saturation of ash, characterize ash
chemistry and leachability, characterize
soil chemistry beneath ash, geologic
cross section, groundwater modeling
AB-5 40 4 - 5
Ash
Ash
Ash
Soil
Soil
1-2'
Intermediate (if >20' thick)
Above ash/soil contact
2' Below ash/soil contact
Bottom of boring
Total metals + SPLP
Total metals + SPLP
Total metals + SPLP
Total metals + Geotech
Total metals + Geotech
Refine ash thickness, determine residual
saturation of ash, characterize ash
chemistry and leachability, characterize
soil chemistry beneath ash, geologic
cross section, groundwater modeling
Background Soil
AW-1S/D 20
50 4
Soil
Soil
Water
Water
Just above the water table
Within lower screen interval
15 feet
45 feet
Total metals
Total metals
Table 2 List
Table 2 List
Horizontal/vertical assessment,
groundwater modeling and statistical
evaluation
AW-2S/D 20
50 4
Soil
Soil
Water
Water
Just above the water table
Within lower screen interval
15 feet
45 feet
Total metals
Total metals
Table 2 List
Table 2 List
Horizontal/vertical assessment,
groundwater modeling and statistical
evaluation
AW-3S/D 20
50 4
Soil
Soil
Water
Water
Just above the water table
Within lower screen interval
15 feet
45 feet
Total metals
Total metals
Table 2 List
Table 2 List
Horizontal/vertical assessment,
groundwater modeling and statistical
evaluation
AW-4S/D 20
50 4
Soil
Soil
Water
Water
Just above the water table
Within lower screen interval
15 feet
45 feet
Total metals
Total metals
Table 2 List
Table 2 List
Horizontal/vertical assessment,
groundwater modeling and statistical
evaluation
AW-5S/D 20
50 4
Soil
Soil
Water
Water
Just above the water table
Within lower screen interval
15 feet
45 feet
Total metals
Total metals
Table 2 List
Table 2 List
Horizontal/vertical assessment,
groundwater modeling and statistical
evaluation
AW-6D 70 2 Soil
Water
Within lower screen interval
67 feet
Total metals
Table 2 List
Vertical assessment, groundwater
modeling
AW-7D 70 2 Soil
Water
Within lower screen interval
67 feet
Total metals
Table 2 List
Vertical assessment, groundwater
modeling
SW-1S/D 20
50 4
Soil
Soil
Water
Water
Just above the water table
Within lower screen interval
15 feet
45 feet
Total metals
Total metals
Table 2 List
Table 2 List
Sentinel Wells, horizontal/vertical
characterization, groundwater modeling
and statistical evaluation.
SW-2S/D 20
50 4
Soil
Soil
Water
Water
Just above the water table
Within lower screen interval
15 feet
45 feet
Total metals
Total metals
Table 2 List
Table 2 List
Sentinel Wells, horizontal/vertical
characterization, groundwater modeling
and statistical evaluation.
SW-3S/D 20
50 4
Soil
Soil
Water
Water
Just above the water table
Within lower screen interval
15 feet
45 feet
Total metals
Total metals
Table 2 List
Table 2 List
Sentinel Wells, horizontal/vertical
characterization, groundwater modeling
and statistical evaluation.
SW-4S/D 20
50 4
Soil
Soil
Water
Water
Just above the water table
Within lower screen interval
15 feet
45 feet
Total metals
Total metals
Table 2 List
Table 2 List
Sentinel Wells, horizontal/vertical
characterization, groundwater modeling
and statistical evaluation.
SW-5S/D 20
50 4
Soil
Soil
Water
Water
Just above the water table
Within lower screen interval
15 feet
45 feet
Total metals
Total metals
Table 2 List
Table 2 List
Sentinel Wells, horizontal/vertical
characterization, groundwater modeling
and statistical evaluation.
SW-6S/D 20
50 4
Soil
Soil
Water
Water
Just above the water table
Within lower screen interval
15 feet
45 feet
Total metals
Total metals
Table 2 List
Table 2 List
Sentinel Wells, horizontal/vertical
characterization, groundwater modeling
and statistical evaluation.
APZ-4S/D
(AB-4)
20
40 3
Soil
Water
Water
Within lower screen interval
15 feet
45 feet
Total metals
Table 2 List
Table 2 List
Determine residual saturation of ash,
characterize groundwater chemistry
beneath pond, groundwater modeling,
APZ-5S/D
(AB-5)
20
40 3
Soil
Water
Water
Within lower screen interval
15 feet
45 feet
Total metals
Table 2 List
Table 2 List
Determine residual saturation of ash,
characterize groundwater chemistry
beneath pond, groundwater modeling.
None anticipated at this time based on available data from previous assessment activities.
Ash Basin
New Monitoring
Wells
P:\Duke Energy Progress.1026\ALL NC SITES\DENR Letter Deliverables\GW Assessment Plans\Sutton\Tables\Table 3 Assessment Sampling Plan Sutton.xlsx Page 1 of 2
TABLE 3
ASSESSMENT SAMPLING PLAN
L.V. SUTTON ENERGY COMPLEX
DUKE ENERGY PROGRESS, INC., WILMINGTON, NORTH CAROLINA
ASH
MANAGEMENT
AREA
BORING /
WELL ID
ESTIMATED
BORING
DEPTH
(ft bgs)
ESTIMATED
NO. OF
SAMPLES
SAMPLE
MEDIA
SAMPLE
DEPTHS/INTERVALS/
TARGET ZONES
LAB ANALYSIS PURPOSE/NOTES
PE-SW2 60 1 Water Screened interval Table 2 List Vertical groundwater quality,
groundwater modeling.
PE-SW4 60 1 Water Screened interval Table 2 List Vertical groundwater quality,
groundwater modeling.
PE-SW5 60 1 Water Screened interval Table 2 List Vertical groundwater quality,
groundwater modeling.
PE-SW6A 60 1 Water Screened interval Table 2 List Vertical groundwater quality,
groundwater modeling.
PE-SW6B 60 1 Water Screened interval Table 2 List Vertical groundwater quality,
groundwater modeling.
PE-SW6D 40 1 Water Screened interval Table 2 List Vertical groundwater quality,
groundwater modeling.
PE-SW6E 51 1 Water Screened interval Table 2 List Vertical groundwater quality,
groundwater modeling.
Existing
Monitoring Wells TBD Variable TBD Water
Well Screen Interval
(variable)Table 2 List
Horizontal/vertical extent of
groundwater quality, groundwater
modeling.
Notes:
SPLP (Synthetic Preciptation Leaching Procedure) Metals - As, B, Ba, Cd, Cr, Cu, Fe, Hg, Mn,Mo, Ni, Pb, Sb, Se, Tl, and Zn.
Table 2 List - Parameter list presented in Table 2 of this document.
ft bgs - Feet below ground surface.
TBD - To be determined.
Geotech - Geotechnical parameters include moisture content, particle size distribution, Atterberg limits, specific gravity, and permeability.
Total Metals - As, B, Ba, Cd, Cr, Cu, Fe, Hg, Mn,Mo, Ni, Pb, Sb, Se, Tl, and Zn.
Site Production
Wells
Prepared by: HJF Checked by: KWW
P:\Duke Energy Progress.1026\ALL NC SITES\DENR Letter Deliverables\GW Assessment Plans\Sutton\Tables\Table 3 Assessment Sampling Plan Sutton.xlsx Page 2 of 2

APPENDIX A
NCDENR LETTER OF AUGUST 13, 2014