_Coal Pile Assessment Work Plan TM_FINAL_20181113

,(VIP
synTerra
Date:
To:
Cc:
From:
November 13, 2018
Ryan Czop (Duke Energy)
TECHNICAL MEMORANDUM
File: 1026.103.43
John Toepfer and Andrew Shull (Duke Energy), Kathy Webb (SynTerra)
Chris Suttell
Subject: Cape Fear Steam Electric Plant Coal Pile Assessment Work Plan
Introduction
Duke Energy Progress, LLC (Duke Energy) owns and operates the Cape Fear Steam
Electric Plant (Plant or Site) in Moncure, Chatham County, North Carolina. The Site is a
former coal-fired electrical power generation facility located on approximately 900
acres. Groundwater and soil assessment activities proposed for the former coal storage
area (coal pile) are described herein.
Regulatory Background
In 2014, The North Carolina General Assembly passed the Coal Ash Management Act
(CAMA). CAMA requires owners of a coal combustion residuals (CCR) surface
impoundment to conduct detailed assessment of site groundwater within and
surrounding the CCR surface impoundments.
Primary sources of CCR-related constituents were identified during the Comprehensive
Site Assessment (CSA) for CAMA. Those sources are five ash basins, referred to by the
date of construction: 1956, 1963, 1970, 1978, and 1985. Groundwater monitoring wells
were installed north, west, and south of the coal pile during CAMA-associated
fieldwork.
Boron, an inorganic constituent, is commonly used as an indicator of CCR impacts to
groundwater. Groundwater sampling results from the wells near the coal pile did not
indicate elevated concentrations of boron. However, data indicate the former coal pile -
area soils may be a potential additional source of inorganic constituents such as sulfate
and TDS to groundwater.
Station Description
Power production began at the Cape Fear Plant in 1923. Generation units were retired
in 2012 and have been decommissioned. Coal is no longer stored on -Site. The former
coal pile was removed in approximately 2013. Aerial photographs dating back to 1950
Page 1 of 3
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Coal Pile Assessment Work Plan
November 13, 2018
Duke Energy Progress, LLC, Cape Fear Steam Electric Plant
SynTerra
indicate coal might have been stored in at least two different, but overlapping, areas
south of the 1956 ash basin. The approximate footprint of each of the two coal storage
areas is shown on Figure 1. The original pile was located west of where the coal was
stored more recently, until the plant ceased operations in 2012. Together, the combined
historical footprint of the two coal piles encompasses approximately 11 acres. The 1956
ash basin dike borders the former coal pile storage area to the north and northwest. A
flood dike is between the former coal pile areas and the Cape Fear River to the west.
South of the former coal pile areas there is a slight topographical rise. Surface water
runoff from the area is directed toward a low-lying area to the east of the former coal
pile area. Flow from the wet area is toward Shaddox Creek.
Coal Pile Area Assessment Objectives
Objectives of the coal pile area assessment include the following:
• Supplement the existing background dataset with additional background
samples from a location with similar geology that is upgradient of the former
coal pile
• Compare inorganic constituent concentrations in former coal pile area with
Site background concentrations
• Characterize inorganic constituents associated with former coal pile area soils
• Characterize inorganic constituent concentrations in soil and groundwater
along the former coal pile perimeter
Soil Assessment
Former coal pile area unsaturated soil is proposed to be sampled and analyzed for
inorganic parameters to determine whether the unsaturated soil is a potential secondary
source of CCR-related constituents that could leach into underlying groundwater.
Unsaturated soil samples are proposed to be collected at proposed monitoring well
locations (CP-BG, and CP-I through CP-9) as part of well installation activities (Figure
1), including a background location. Soil samples are proposed to be collected at
approximately 2-foot intervals to the top of the groundwater table (approximately 10
feet below ground surface). Saturated soil samples are proposed to be collected below
the water table within the new well screened intervals. Soil samples will be analyzed for
inorganic parameters listed on Table 1.
Page 2 of 3
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Coal Pile Assessment Work Plan November 13, 2018
Duke Energy Progress, LLC, Cape Fear Steam Electric Plant SynTerra
Groundwater Assessment
Twenty (20) former coal pile (CP) assessment groundwater monitoring wells are
proposed to be installed to characterize former coal pile area groundwater in shallow
(surficial) and bedrock groundwater zones. The shallow zone is considered
groundwater within soil, alluvium, and saprolite material. The bedrock zone is
considered groundwater within competent bedrock material underlying the shallow
zone. CSA data indicate the "deep" zone of partially weathered rock is insufficiently
thick for monitoring. Ten (10) shallow ("S") and 10 bedrock ("BR") groundwater
monitoring wells (CP-BG and CP-IS/BR through CP-9S/BR) would be installed as well
pairs, including a background location. Proposed CP well installation locations are
shown on Figure 1, and proposed well details are provided as Table 2. Specific well
locations may be shifted depending on access and field conditions at the time of
installation. Groundwater samples will be analyzed for inorganic constituents listed on
Table 3.
Coal Pile Assessment Report
The former coal pile assessment report will be prepared following collection and receipt
of at least two sets of groundwater analytical data. The report will include the following
components:
1) Site History and Source Characterization
2) Site Geology and Hydrogeology
3) Sampling Results
4) Site Conceptual Model
5) Conclusions and Recommendations
ATTACHMENTS:
Table 1: Soil Analytical Methods
Table 2: Proposed Coal Pile Assessment Soil Samples and Monitoring Wells
Table 3: Groundwater Analytical Methods
Figure 1: Proposed Coal Pile Assessment Sample Locations
Page 3 of 3
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Coal Pile Assessment Work Plan
November 13, 2018
Duke Energy Progress, LLC, Cape Fear Steam Electric Plant
ATTACHMENTS
SynTerra
P:\Duke Energy Progress.1026\103. Cape Fear Ash Basin GW Assessment\43.Coal Pile Assessment\Work
Plan\Cape Fear - Coal Pile Assessment Work Plan TM_FINAL.docx

TABLE 1
SOIL ANALYTICAL METHODS
CAPE FEAR STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, MONCURE, NC
INORGANIC COMPOUNDS
UNITS
METHOD
Aluminum
mg/kg
EPA 6010D
Antimony
mg/kg
EPA 6020B
Arsenic
mg/kg
EPA 6020A
Barium
mg/kg
EPA 6010C
Beryllium
mg/kg
EPA 6020B
Boron
mg/kg
EPA 6010C
Cadmium
mg/kg
EPA 6020A
Calcium
mg/kg
EPA 6010C
Chloride
mg/kg
EPA 9056A
Chromium
mg/kg
EPA 6010C
Cobalt
mg/kg
EPA 6020A
Copper
mg/kg
EPA 6010C
Iron
mg/kg
EPA 6010C
Lead
mg/kg
EPA 6020A
Magnesium
mg/kg
EPA 6010C
Manganese
mg/kg
EPA 6010C
Mercury
mg/kg
EPA Method 7471B
Molybdenum
mg/kg
EPA 6010C
Nickel
mg/kg
EPA 6010C
Nitrate as Nitrogen
mg/kg
EPA 9056A
pH
SU
EPA 9045D
Potassium
mg/kg
EPA 6010C
Selenium
mg/kg
EPA 6020A
Sodium
mg/kg
EPA 6010C
Strontium
mg/kg
EPA 6010C
Sulfate
mg/kg
EPA 9056A
Thallium (low level) (SPLP Extract only)
mg/kg
EPA 6020A
Total Organic Carbon
mg/kg
EPA 9060
Vanadium
mg/kg
EPA 6020A
Zinc
mg/kgmg/kg
EPA 6010C
Prepared by: RBI Checked by: CIS
Notes:
1. Soil samples to be analyzed for Total Inorganics using USEPA Methods 6010/6020 and pH using USEPA Method 9045, as noted above.
2. Ash samples to be analyzed for Total Inorganics using USEPA Methods 6010/6020 and pH using USEPA Method 9045; select ash
samples will also be analyzed for leaching potential using SPLP Extraction Method 1312 in conjunction with USEPA Methods 6010/6020.
3. Analytical methods and reporting limits as presented were applicable at time of CSA field implementation in 2015. Analytical methods
and reporting limits are updated periodically and applied as appropriate.
meq/100g - millequivalents per 100 grams
mg/kg - Milligrams per kilogram
my - Millivolts
S.U. - Standard Unit
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Table 1 - Soil Analytical Methods Page 1 of 1

TABLE 2
PROPOSED COAL PILE ASSESSMENT SOIL SAMPLES AND MONITORING WELLS
CAPE FEAR STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, MONCURE, NC
Monitoring
Well ID
Estimated
Well Depth
(feet bgs)
Soil Sample ID
(Estimated Depth
Interval in feet bgs)
Comments
CPBG-01SB 2-3
Near -surface unsaturated soil sample, water table —10 feet bgs
CPBG-01SB 5-6
Unsaturated soil sample, water table —10 feet bgs
CPBG-01SB 8-9
Unsaturated soil sample, water table —10 feet bgs
CPBG-01S
25
CPBG-01SB (20-21)
Soil sample from shallow well screened interval
CPBG-01BR
50
CPBG-01SB (45-46)
Soil sample from bedrock well screened interval
CP-02SB 2-3
Near -surface unsaturated soil sample, water table —10 feet bgs
CP-02SB 5-6
Unsaturated soil sample, water table —10 feet bgs
CP-02SB 8-9
Unsaturated soil sample, water table —10 feet bgs
CP-02S
25
CP-02SB (20-21)
Soil sample from shallow well screened interval
CP-02BR
50
CP-02SB (45-46)
Soil sample from bedrock well screened interval
CP-03SB 2-3
Near -surface unsaturated soil sample, water table —10 feet bgs
CP-03SB 5-6
Unsaturated soil sample, water table —10 feet bgs
CP-03SB 8-9
Unsaturated soil sample, water table —10 feet bgs
CP-03S
25
CP-03SB (20-21)
Soil sample from shallow well screened interval
CP-03BR
50
CP-03SB (45-46)
Soil sample from bedrock well screened interval
CP-04SB 2-3
Near -surface unsaturated soil sample, water table —10 feet bgs
CP-04SB 5-6
Unsaturated soil sample, water table —10 feet bgs
CP-04SB 8-9
Unsaturated soil sample, water table —10 feet bgs
CP-04S
25
CP-04SB (20-21)
Soil sample from shallow well screened interval
CP-04BR
50
CP-04SB (45-46)
Soil sample from bedrock well screened interval
CP-05SB 2-3
Near -surface unsaturated soil sample, water table —10 feet bgs
CP-05SB 5-6
Unsaturated soil sample, water table —10 feet bgs
CP-05SB 8-9
Unsaturated soil sample, water table —10 feet bgs
CP-05S
25
CP-05SB (20-21)
Soil sample from shallow well screened interval
CP-05BR
50
CP-05SB (45-46)
Soil sample from bedrock well screened interval
CP-06SB 2-3
Near -surface unsaturated soil sample, water table —10 feet bgs
CP-06SB (5-6)
Unsaturated soil sample, water table —10 feet bgs
CP-06SB 8-9
Unsaturated soil sample, water table —10 feet bgs
CP-06S
25
CP-06SB (20-21)
Soil sample from shallow well screened interval
CP-06BR
50
CP-06SB (45-46)
Soil sample from bedrock well screened interval
CP-07SB 2-3
Near -surface unsaturated soil sample, water table —10 feet bgs
CP-07SB 5-6
Unsaturated soil sample, water table —10 feet bgs
CP-07SB 8-9
Unsaturated soil sample, water table —10 feet bgs
CP-07S
25
CP-07SB (20-21)
Soil sample from shallow well screened interval
CP-07BR
50
CP-07SB (45-46)
Soil sample from bedrock well screened interval
CP-08SB 2-3
Near -surface unsaturated soil sample, water table —10 feet bgs
CP-08SB 5-6
Unsaturated soil sample, water table —10 feet bgs
CP-08SB 8-9
Unsaturated soil sample, water table —10 feet bgs
CP-08S
25
CP-08SB (20-21)
Soil sample from shallow well screened interval
CP-08BR
50
CP-08SB (45-46)
Soil sample from bedrock well screened interval
P:\Duke Energy Progress.1026\103. Cape Fear Ash Basin GW Assess ment\43.CoaI Pile Assessment\Work Plan\
Table 2 - CF Proposed Coal Pile Assessment Boring & Well Depths Page 1 of 2

TABLE 2
PROPOSED COAL PILE ASSESSMENT SOIL SAMPLES AND MONITORING WELLS
CAPE FEAR STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, MONCURE, NC
Monitoring
Well ID
Estimated
Well Depth
(feet bgs)
Soil Sample ID
(Estimated Depth
Interval in feet bgs)
Comments
CP-09SB 2-3
Near -surface unsaturated soil sample, water table —10 feet bgs
CP-09SB 5-6
Unsaturated soil sample, water table —10 feet bgs
CP-09SB 8-9
Unsaturated soil sample, water table —10 feet bgs
CP-09S
25
CP-09SB (20-21)
Soil sample from shallow well screened interval
CP-09BR
50
CP-09SB (45-46)
Soil sample from bedrock well screened interval
CP-10SB 2-3
Near -surface unsaturated soil sample, water table —10 feet bgs
CP-10SB (5-6)
Unsaturated soil sample, water table —10 feet bgs
CP-10SB 8-9
Unsaturated soil sample, water table —10 feet bgs
CP-10S
25
CP-10SB (20-21)
Soil sample from shallow well screened interval
CP-10BR
50
CP-10SB (45-46)
Soil sample from bedrock well screened interval
Prepared by: LWD Checked by: CJS
Notes:
bgs = below ground surface
— = Approximately
SynTerra recommends rotosonic drilling methods for boring and well installation
Continuous cores from sonic drilling provide sufficient material for soil sampling and lithologic description.
Estimated well and soil sample depths based on data from the CMW-2, CTMW-2, ABMW-5S/BR, and MW-17S/BR wells.
Number of soil samples shown is approximate. A shallower water table will result in fewer samples, and a deeper water table may result in additional
samples.
SynTerra recommends each well screen be submerged beneath the water table and have a length of at least 10 feet
SynTerra proposes soil samples be collected from well screen intervals for potential use in MNA analysis.
"S", or surficial wells, may include a surificial upper (SU) and surficial lower (SL) well installation depending on site -specific hydrogeologic conditions.
* Indicates approximate estimation of vertical exploration. Current data is insufficient to provide more accurate estimates.
Boring total depth to be determined during site activities.
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Table 2 - CF Proposed Coal Pile Assessment Boring & Well Depths Page 2 of 2

TABLE 3
GROUNDWATER ANALYTICAL METHODS
CAPE FEAR STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, MONCURE, NC
PARAMETER I RL JUNITS IMETHOD
FIELD PARAMETERS
pH
NA
SU
Field Water Quality Meter
Specific Conductance
NA
PS/Cm
Field Water Quality Meter
Temperature
NA
0C
Field Water Quality Meter
Dissolved Oxygen
NA
mg/L
Field Water Quality Meter
Oxidation Reduction Potential
NA
mV
Field Water Quality Meter
Eh
INA
IMV
IField Water Quality Meter
Turbidity
NA
INTU
IField Water Quality Meter
INORGANICS
Aluminum
0.005
mg/L
EPA 200.7 or 6010D
Antimony
0.001
mg/L
EPA 200.8 or 6020B
Arsenic
0.001
mg/L
EPA 200.8 or 6020B
Barium
0.005
mg/L
EPA 200.7 or 6010D
Beryllium
0.001
mg/L
EPA 200.8 or 6020B
Boron
0.05
mg/L
EPA 200.7 or 6010D
Cadmium
0.001
mg/L
EPA 200.8 or 6020B
Chromium
0.001
mg/L
EPA 200.8 or 6020B
Cobalt
0.001
mg/L
EPA 200.8 or 6020B
Copper
0.001
mg/L
EPA 200.8 or 6020B
Hexavalent Chromium
0.000025
mg/L
EPA 218.7
Iron
0.01
mg/L
EPA 200.7 or 6010D
Lithium
1
mg/L
EPA 200.7 or 6010D
Lead
0.001
mg/L
EPA 200.8 or 6020B
Manganese
0.005
mg/L
EPA 200.7 or 6010D
Mercury
0.00005
mg/L
EPA 245.1 or 7470A
Molybdenum
0.001
mg/L
EPA 200.8 or 6020B
Nickel
0.001
mg/L
EPA 200.8 or 6020B
Selenium
0.001
mg/L
EPA 200.8 or 6020B
Strontium
0.005
mg/L
EPA 200.7 or 6010D
Thallium (low level)
0.0002
mg/L
EPA 200.8 or 6020B
Vanadium (low level)
0.0003
mg/L
EPA 200.8 or 6020B
Zinc
10.005
mg/L
JEPA 200.7 or 6010D
RADIONUCLIDES
Radium 226
11
pCi/L
JEPA 903.1 Modified
Radium 228
11
pCi/L
JEPA 904.0/SW846 9320 Modified
Uranium (233, 234, 236, 238)
lVaries by isotope
µg/mL
ISW846 3010A/6020A
ANIONS/CATIONS/OTHER
Alkalinity (as CaCO3)
5
mg/L
SM 2320B
Bicarbonate
5
mg/L
SM 2320B
Calcium
0.01
mg/L
EPA 200.7
Carbonate
5
mg/L
SM 2320B
Chloride
0.1
mg/L
EPA 300.0 or 9056A
Fluoride
0.1
mg/L
EPA 300.0 or 9056A
Magnesium
0.005
mg/L
EPA 200.7 or 6010D
Potassium
0.1
mg/L
EPA 200.7
Sodium
0.05
mg/L
EPA 200.7
Sulfate
0.1
mg/L
EPA 300.0 or 9056A
Sulfide
0.1
mg/L
SM 4500 S2 D
Total Dissolved Solids
25
mg/L
SM 2540C
Total Phosphorus
10.05
mg/L
JEPA 365.1
Total Organic Carbon
10.1
mg/L
SM5310C/EPA9060A
Total Suspended Solids
15
m /L
ISM 2450D
Prepared by: HHS Checked by: CJS
Notes:
NA indicates not applicable.
°C - Degrees Celsius
mg/L - Milligrams per liter
my - Millivolts
NTU - Nephelometric turbidity unit
pCi/L - picocuries per liter
RL = reporting limit
S.U. - Standard Unit
ug/mL - micrograms per milliliter
µS/cm = micro -Siemens per centimeter
Dissolved and total metals analysis
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Table 3 - Groundwater Analytical Methods Page 1 of 1

'ABMW-5/S/BR
CTM
s
.i
COAL STOCKPILE
ASSESSMENT AREA
CP-5S/B
C P-9
CP-2S/BR
:e .
FORMER COAL PILE (REMOVED)
COAL STOCKPILE AREA
BASED ON 1965 AERIAL PHOTOGRAPH
. CP-WBR
C P-7
COAL STOCKPILE AREA BASED ON
1950 AERIAL PHOTOGRAPH
FORMER STEAM ELECTRIC PLANT
r
MW-17SUSU/BR
1�lp
synTerra
PBG-1 S/BR
� y
GRAPHIC SCALE
100 0 100 200
IN FEET
148 RIVER STREET, SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
WWW 'erraooro.00m
DRAWN BY: A. FEIGL DATE: 08/24/2018
PROJECT MANAGER: C.SUTTELL
CHECKED BY: L. DRAGO
P:\Duke Enerav Proaress.1026\00 GIS BASE DATA\Cane Fear'
LEGEND
PROPOSED COAL PILE ASSESSMENT SOIL
BORING AND MONITORING WELL
EXISTING CAMA GROUNDWATER
MONITORING WELL LOCATION
ASH BASIN WASTE BOUNDARY
DUKE ENERGY PLANT BOUNDARY
TOPOGRAPHIC CONTOURS (10' INTERVAL)
TOPOGRAPHIC CONTOURS (Z INTERVAL)
NOTES
AERIAL PHOTOGRAPHY OBTAINED FROM USDA FSA NAIP, DATED
06/19/2014 VIA ESRI WEB SERVICE.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA
STATE PLANE COORDINATE SYSTEM FIPS 3200 (NAD83/2011).
FIGURE 1
PROPOSED COAL PILE ASSESSMENT
SAMPLE LOCATIONS
CAPE FEAR STEAM POWER PLANT
DUKE ENERGY PROGRESS, LLC
MONCURE, NORTH CAROLINA