Ash Basin Dam Soil Sampling Work Plan Compiled_20190814

410 S. Wilmington Street.
Raleigh, NC 27601
DUKE
ENERGY®
August 14, 2019
Ms. Elizabeth Werner
NC DEQ Solid Waste Section
1646 Mail Service Center
Raleigh, NC 27699-1646
RE: Ash Basin Dam Soil Sampling Work Plan - L.V. Sutton Energy Complex
Dear Ms. Werner:
Mailing Address
Mail Code NC 15
Raleigh, NC 27601
919-546-7863
Duke Energy (Duke) submits the Ash Basin Dam Soil Sampling Work Plan for the L.V. Sutton Energy Complex.
The majority of the soil comprising the former 1984 ash basin dam will be regraded within the footprint of
the former ash basin. However, there is excess soil and Duke proposes to use the soils from a portion of the
dam as fill in the existing transmission corridor located onsite between the former basin and existing landfill.
Per prior discussions via telephone, Duke proposes to collect 10 composite soil samples from 10 different
dam cross -sections for analysis.
If you have any questions or need any clarification regarding the information provided, feel free to contact
me at iohn.toepfer@duke-ener>;y.com or at 919-546-7863 at your convenience.
Respectfully submitted,
4o�hn Toepfer, P.E.
Lead Engineer, Duke Energy EHS CCP
Waste & Groundwater Programs
cc: Dan Atkinson — Duke Energy
Ricky Stroupe —Duke Energy
Kent Tyndall —Duke Energy
Mr. James McNash, P.E. — Geosyntec Consultants of North Carolina, P.C.
Mr. Perry Waldrep—SynTerra Corp.
Enc: Ash Basin Dam Soil Sampling Work Plan

A►Sh Basin Dam SOIL SAMPLING WORK PLAN
L.V. Sutton Energy Complex
Duke Energy Progress, LLC.
526 SOUTH CHURCH STREET
CHARLOTTE, NORTH CAROLINA 28202
� DUKE
ENERGY:
Waste & Groundwater Programs
August, 2019

Ash Basin Dam Soil Sampling Plan August, 2019
L.V. Sutton Energy Complex
TABLE OF CONTENTS
SECTION PAGE
1.0 PURPOSE..........................................................................................................................1
2.0 SOIL SAMPLING METHODOLOGY.........................................................................1
2.1 Method Summary........................................................................................................1
2.1.1 Collection of Representative Samples................................................................. 2
2.1.2 Sample Preservation, Containers, Handling and Storage ................................ 2
2.1.3 Decontamination.........................................................................................................3
3.0 SOIL SAMPLING AND ANALYSIS........................................................................... 3
3.1 Soil Sampling................................................................................................................ 3
3.2 Sample Analysis........................................................................................................... 4
4.0 DOCUMENTATION...................................................................................................... 4
5.0 TABLES/FIGURES...........................................................................................................5
TABLE 1- SOIL PARAMETERS AND ANALYTICAL METHODS ......................... 5
FIGURE 1 - SOIL STOCKPILE SAMPLING MAP ...................................................... 6
i

Ash Basin Dam Soil Sampling Plan
August, 2019
L.V. Sutton Energy Complex
1.0 PURPOSE
The purpose of this Soil Sampling Work Plan is to provide a method for collecting and analyzing soil
samples from the 1984 ash basin dam at the L.V. Sutton Energy Complex. All ash has been removed
from the 1984 ash basin and the dams are in process of decommissioning. The majority of the dams will
be regraded within the footprint of the former ash basin. However, there is approximately 120,000
cubic yards of excess soils that will be used as fill within the existing transmission corridor located
between the former 1984 ash basin and the existing landfill. As Duke Energy plans to utilize this excess
soil onsite, sampling is necessary to ensure the soil will not present secondary source contamination.
This Soil Sampling Work Plan is applicable to the collection of representative soil samples and analysis of
soil samples will be used to determine the presence or absence of constituents.
2.0 SOIL SAMPLING METHODOLOGY
2.1 Method Summary
This Soil Sampling Work Plan has been adapted from Environmental Protection Agency (EPA) Standard
Operating Procedures (SOPS) #2012 and #2006.
Soil samples are collected using a plastic trowel, spade, shovel, or scoops along with hand auger for
samples collected at depths below 6 inches. Following collection, soil is transferred from the sampling
device to a plastic bowl to be homogenized. Once homogenized, the soils (composite) will be
transferred into Duke Energy Laboratory supplied sample bottles.
Soil samples will be submitted under chain of custody for the following analyses: total metals and
Synthetic Precipitation Leaching Procedure(SPLP) metals. Analytical methods for total metals and SPLP
metals are described in Table 1.
Equipment
• Sample bottles/containers — To be supplied by Duke Energy Laboratory with
appropriate cooler(s). Estimated that up to five 8-ounce sample bottles with Teflon -
lined lids will be required for each soil sample. For return of cooler to the lab, ice will
be required.
• Gloves — used for personal protection and to prevent cross -contamination of samples —
nitrile, disposable, powderless.
• Field clothing and Personal Protective Equipment— used as specified in the site Health
and Safety Plan.
• Sampling flags— used for identifying soil sampling locations.
• Field notebook —a bound book used to record progress of sampling effort and record
any problems and field observations duringsampling.

Ash Basin Dam Soil Sampling Plan
August, 2019
L.V. Sutton Energy Complex
• Three-ring binder/book — used to store necessary forms and record and track samples
collected at the site.
• Permanent marking pen — used to label sample containers, document field logbooks,
data sheets and chain of custody.
• Plastic spoon — used for homogenizing soil samples within a plastic bowl.
• Plastic bowl —used for homogenizing soil samples, when applicable.
• Camera — used for photo -documentation of sample locations and samples.
• Trash bag — used to dispose of gloves and any other non -hazardous waste generated
during sampling.
• Decontamination supplies and equipment.
2.1.1 Collection of Representative Samples
All sampling equipment will be decontaminated prior to use. The following procedure will be
used to collect each soil sample at each of the ten proposed cross -sections:
• Locate general sampling locations and record coordinates with a GPS unit.
• Collect a soil column at each designated sampling location using a hand auger
or plastic spoon/trowel or shovel. Combine samples from each cross-section
location within a sample (Shown in Figure 1) mixing bowl and thoroughly mix.
• Transferto the sample bottles and secure sample bottles tightly.
2.1.2 Sample Preservation, Containers, Handling and Storage
Chemical preservation of soils is generally not recommended. Cooling to 4°C on wet ice is
usually the best approach, supplemented by the appropriate holding time for the analyses
requested.
The Duke Energy Laboratory will supply the appropriate sample bottles for the collected soil
samples. The sample volume is a function of the analytical requirements and the Duke Energy
Laboratory will ensure the appropriate number of bottles are supplied. Ensure chain of custody
is completed for sample bottle return to the Duke Energy Laboratory.
Table 1 contains a list of parameters to be analyzed with corresponding reporting units and
analytical methods. If a parameter or group of parameters is not included in Table 1, the
laboratory performing the analysis should be contacted to determine the appropriate sample
bottles, volumes, and preservatives.
All non -dedicated sampling devices should be decontaminated and wrapped in plastic. The
sampling device should remain in this wrapping until it is needed. Each sampling device should

Ash Basin Dam Soil Sampling Plan
L.V. Sutton Energy Complex
August, 2019
be used for only one sample and then decontaminated or disposed of. Non -dedicated sampling
devices should be cleaned in the field using the decontamination procedure described below.
2.1.3 Decontamination
Decontamination procedures can be time consuming; having a sufficient quantity of sampling
tools available is recommended. All non -dedicated sampling equipment must be
decontaminated prior to reuse. Equipment decontamination consists of:
1. Detergentwash and brush cleaning
2. Tap water rinse
3. De -ionized water rinse
4. Air dry
5. Wrap sampling tools with plastic
3.0 SOIL SAMPLING AND ANALYSIS
3.1 Soil Sampling
Sample locations will be collected in a manner similar to UST Guidelines for Sampling. At each
of the ten cross -sections, samples will be collected from the mid -point of the upstream face of
dam, the center top of dam and the mid -point of the downstream face of the dam.
The dam is approximately 16 feet in height. Samples will be collected as follows:
Mid -point upstream face (8 feet above basin floor)
0-6 inches
4-4.5 feet
7-7.5 feet
Center top of dam (16 feet above basin floor)
3-3.5 feet
6-6.5 feet
10-10.5 feet
Mid -point downstream face (8 feet above basin floor)
0-6 inches
4-4.5 feet
7-7.5 feet
Therefore, at each cross-section, nine individual samples will be collected and homogenized
together and result in one composite soil sample for laboratory analysis. There will be 10 cross -
sections total as shown in Figure 1.
3

Ash Basin Dam Soil Sampling Plan
L.V. Sutton Energy Complex
August, 2019
3.2 Sample Analysis
The ten composite samples will be sent to the Duke Energy Laboratory for analysis of total
metals and SPLP metals. The lab will test for the inorganic compounds listed in Table 1. The
results will be compared to site background levels, along with the current Protection of
Groundwater Preliminary Soil Remediation Goals (PSRG) and the Industrial/Commercial PSRG
set forth by NCDEQ. If the 10 sample results for total metals do not exceed the Protection of
Groundwater PSRG and/or site background (which ever is greater), then NCDEQ Division of
Waste Management, Solid Waste Section will be notified and the soil will be used as general fill
onsite within the transmission corridor between the former ash basin and landfill.
4.0 DOCUMENTATION
A comprehensive report will be submitted to NCDEQ Division of Waste Management, Solid
Waste Section and include the associated lab reports. If an exceedance is found when data is
compared to background and/or PSRG for Protection of Groundwater, then Duke Energy will
discuss further action and/or additional sampling plans with NCDEQ.
4

Ash Basin Dam Soil Sampling Plan
L.V. Sutton Energy Complex
5.0 TABLES/FIGURES
TABLE 1- SOIL PARAMETERS AND ANALYTICAL METHODS
August, 2019
INORGANIC COMPOUNDS
UNITS
METHOD'
Aluminum
mg/kg or µg/I
EPA 6010D
Antimony
mg/kg or µg/I
EPA 6020B
Arsenic
mg/kg or µg/I
EPA 6020E
Barium
mg/kg or µg/I
EPA 6010D
Beryllium
mg/kg or µg/I
EPA 6020E
Boron
mg/kg or µg/I
EPA 6010D
Cadmium
mg/kg or µg/I
EPA 6020B
Calcium
mg/kg or µg/I
EPA 6010D
Chloride
mg/kg or µg/I
EPA 9056A
Chromium (Total)
mg/kg or µg/I
EPA 6010D
Cobalt
mg/kg or µg/I
EPA 6020B
Copper
mg/kg or µg/I
EPA 6010D
Hexavalent Chromium
mg/kg or µg/I
EPA Method
7199/218.7
Iron
mg/kg or µg/I
EPA 6010D
Lead
mg/kg or µg/I
EPA 6020B
Magnesium
mg/kg or µg/I
EPA 6010D
Manganese
mg/kg or µg/I
EPA 6010D
Mercury
mg/kg or µ
EPA Methodg/I 7470A/7471B
Molybdenum
mg/kg or µg/I
EPA 6010D
Nickel
mg/kg or µg/I
EPA 6010D
Nitrate as Nitrogen
mg/kg or µg/I
EPA 9056A
pH
SU
EPA 9045D
Potassium
mg/kg or µg/I
EPA 6010D
Selenium
mg/kg or µg/I
EPA 6020E
Silver
mg/kg or µg/I
EPA 6020E
Sodium
mg/kg or µg/I
EPA 6010D
Strontium
mg/kg or µg/I
EPA 6010D
Sulfate
mg/kg or µg/I
EPA 9056A
Thallium (low level) (SPLP Extract only)
mg/kg or µg/I
EPA 6020B
Vanadium
mg/kg or µg/I
EPA 6020E
Zinc
mg/kg or µg/I
EPA 6010D
Notes:
1. Soil samples to be analyzed for Total Inorganics using USEPA Methods 6010/6020 and pH
using USEPA Method 9045, as noted above (or similar approved methods). Soil samples will
also be analyzed for leaching potential using SPLP Extraction Method 1312 in conjunction with
USEPA Methods 6010/6020 (or similar approved methods).

Ash Basin Dam Soil Sampling Plan
August, 2019
L.V. Sutton Energy Complex
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LEGEND
Dike Cresf
(-1600 LF)
Proposed Sample
Location Cross
Section (Every -175')
-