1812_DukeEnergy_Cell5_Incident_RequestConv_FID_20240206

Moutos, Sarah
From:
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Subject:
Attachments:
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Follow Up Flag:
Flag Status:
FYI
Osborn, Claire J
Tuesday, February 6, 2024 11:55 AM
Smith, Eric G; Moutos, Sarah; Werner, Elizabeth
Russ, Jordan A; Stanley, Sherri
FW: [EXTERNAL] FW: Marshall ILF Incident
Closure Plan -Appendix E.pdf
High
Follow up
Flagged
From: Healy, Ashley Lisbeth <[e-mail]>
Sent: Tuesday, February 6, 2024 11:48 AM
To: Osborn, Claire J <[e-mail]>; Witt, Kimberlee <[e-mail]>
Subject: RE: [EXTERNAL] FW: Marshall ILF Incident
CAUTION: External email. Do not click links or open attachments unless verified. Report suspicious emails with the Report Message
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Claire - To recertify clean closure Duke Energy will conduct visual inspection and PLM sampling on the 100' x 100' grid
per the Excavation Soil Sampling Plan. Visual inspection and sampling will be conducted within the stormwater channel
that is located within four grids that were previously verified closed, including L7, L8, L9, and L10.
Documentation will be included in the final CCR verification report for the site.
Please let me know of any questions or concerns with this approach. Thanks, Ashley
Ashley L. Healy, P.G.
Waste and Groundwater Programs
Mobile: [phone]
From: Osborn, Claire J <[e-mail]>
Sent: Monday, January 29, 2024 3:35 PM
To: Healy, Ashley Lisbeth <[e-mail]>; Witt, Kimberlee <[e-mail]>
Subject: [EXTERNAL] FW: Marshall ILF Incident
Good afternoon,
The message was returned undelivered due to file size to Duke Energy employees copied. Please see the initial response.
I have deleted the images you shared, Ashley, with clean closure certification to decrease the size of the email. Please

see the Department's response to the incident which occurred on January 91h and the Department's requirement to
recertify clean closure along with updated PLM data. Please let us know if you have any questions.
Regards,
Claire Osborn, P.E.
Environmental Engineer
Permitting Branch, Solid Waste Section
Division of Waste Management
North Carolina Department of Environmental Quality
828.296-4706 (Office)
claire.osbom&deq.nc. gov
Q:>
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Osborn, Claire J
Sent: Monday, January 29, 2024 3:19 PM
To: Healy, Ashley Lisbeth <[e-mail]>; [e-mail]
Cc: Smith, Eric G <[e-mail]>; Pitner, Andrew <[e-mail]>; Costner, Brandy F
<[e-mail]>; Moutos, Sarah <[e-mail]>; Mussler, Ed <[e-mail]>;
Russ, Jordan A <[e-mail]>; Stanley, Sherri <[e-mail]>; Werner, Elizabeth
<[e-mail]>; Yitbarek, Diana <[e-mail]>
Subject: Marshall ILF Incident
Good afternoon Ashley,
In response to the incident which occurred on January 9th at the Marchall Industrial Landfill (ILF) (1812-INDUS-2008)
where ash and leachate were released into a stormwater ditch which had previously been clean closed, the Department
of Environmental Quality requires recertification of this area for clean closure with updated PLM data. Please let us
know if you have any questions.
Regards,
Claire Osborn, P.E.
Environmental Engineer
Permitting Branch, Solid Waste Section
Division of Waste Management
North Carolina Department of Environmental Quality
828.296-4706 (Office)
claire.osborn a,deq.nc. og_v

DE
of Fmka+�x�lil 4oYnp��
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties by an authorized
state official.

APPENDIX E
EXCAVATION AND SAMPLING PLAN

EXCAVATION SOIL SAMPLING PLAN
MARSHALL STEAM STATION
FOR ASH BASIN EXCAVATION
NORTH CAROLINA ASH BASIN CLOSURE
DUKE ENERGY CAROLINAs, LLC.
526 SOUTH CHURCH STREET/ECI3K
CHARLOTTE, NORTH CAROLINA 28202
� DUKE
ENERGY
Waste & Groundwater Programs
Revision 2
December 2019

Excavation Soil Sampling Plan December 2019
Marshall Steam Station Revision 2
TABLE OF CONTENTS
SECTION PAGE
1.0 PURPOSE..........................................................................................................................1
2.0 DOCUMENTATION SUMMARY...............................................................................1
TABLE 1 - Post Ash Basin Excavation Soil Data Collection......................................1
3.0 SOIL SAMPLING METHODOLOGY......................................................................... 2
3.1 Method Summary........................................................................................................ 2
3.1.1 Equipment...............................................................................................................2
3.1.2 Sample Locations................................................................................................... 3
3.1.3 Collection of Representative Samples................................................................. 3
3.1.4 Sample Preservation, Containers, Handling and Storage ................................ 4
3.1.5 Decontamination.................................................................................................... 4
4.0 VISUAL CONFIRMATION OF ASH REMOVAL .................................................... 5
4.1 Pre -Excavation Documentation................................................................................. 5
4.2 Ash Removal Verification Protocol........................................................................... 5
4.2.1 Field Documentation............................................................................................. 5
4.2.2 Fill Evaluation Criteria.......................................................................................... 6
4.3 Visual Removal Not Applicable................................................................................ 6
5.0 SOIL SAMPLING AND ANALYSIS........................................................................... 7
5.1 Soil Sampling................................................................................................................ 7
5.1.1 Scenario 1................................................................................................................ 8
5.1.2 Scenario 2................................................................................................................ 8
5.2 Fate and Transport Modeling..................................................................................... 8
TABLE 2 - Soil Parameters and Analytical Methods Totals and SPLP Analysis
North Carolina Ash Basins to be Closed Via Excavation ........................................... 9
FIGURE 1— Marshall Steam Station Sample Grid....................................................10
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Excavation Soil Sampling Plan December 2019
Marshall Steam Station
1.0 PURPOSE
Revision 2
The purpose of this Excavation Soil Sampling Plan is to provide a standardized method for collecting soil
samples at Duke Energy North Carolina ash basins where areas of excavation are included in the
approved Closure Plan.. Soil samples described in this Excavation Soil Sampling Plan will be collected
following visible ash removal from excavation areas identified in the approved Closure Plan.
This Excavation Soil Sampling Plan is applicable to the collection of representative soil samples. Analysis
of soil samples may be chemical or physical in nature and may be used to determine the following:
• Extent and magnitude of constituent occurrence
• Input concentrations for groundwater fate and transport model
The methodologies discussed in this Excavation Soil Sampling Plan are applicable to the sampling of soil
in ash basin excavation areas. For the purposes of this plan, soils are those mineral and organic
materials remaining after all visible ash has been removed.
2.0 DOCUMENTATION SUMMARY
TABLE 1 - Post Ash Basin Excavation Soil Data Collection
Task
Description
Test
Depth
Visual Inspection on 100' X 100' grid
Visually confirm primary source
node
removal at nodes (Figure 1) and
N/A
N/A
document with photographs.
Soil sample analysis on 100' X 100'
Collect representative samples at
0 - 6 inches'
grid node
nodes (Figure 1) the appropriate
PLM
2 2 5'
depths.
0 - 6 inches'
Soil Sample Analysis on an acre grid
Collect representative samples at the
Total Metals
2 2.5
7 7.5
systemz
appropriate depths.
SPLP
12' - 12.5'
17' - 17.5'
Notes:
'If a certain six-inch sample interval does not yield sufficient soil volume to fill five 8-ounce sample bottles, the
sample interval may be expanded to twelve inches to allow for sufficient soil sample volume. The revised sample
interval should be appropriately documented.
2Excavation is complete once confirmed by visual inspection and PLM analysis per Section 4.0.
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Excavation Soil Sampling Plan
December 2019
Marshall Steam Station
3.0 SOIL SAMPLING METHODOLOGY
3.1 Method Summary
Revision 2
This Excavation Soil Sampling Plan has been adapted from Environmental Protection Agency (EPA)
Standard Operating Procedures (SOPs) #2012 and #2006 and North Carolina Department of
Environmental Quality (NC DEQ) Attachment 1 Coal Combustion Residuals Surface Impoundment
Closure Guidelines for Protection of Groundwater, November 4, 2016.
Soil samples are collected directly using stainless steel or plastic trowel, spade, shovel, or scoops.
Following collection, soil is transferred from the sampling device to a stainless steel or plastic bowl to be
homogenized. Once homogenized, the soil is 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 2. Ash presence is quantitatively determined by polarized light
microscopy (PLM) by Duke Lab or state approved vendor. PLM analysis passes visible light through a
pair of polarizing filters to create optical effects used in identifying unknown materials. This method is
commonly used in asbestos and coal ash identification.
3.1.1 Equipment
• Stainless steel or plastic trowel, scoop, spade or shovel — Used for collecting soil samples
from surface locations.
• Sample containers — To be supplied by Duke Energy Laboratory with appropriate
cooler(s). Estimated that five 8-ounce sample bottles with Teflon -lined lids will be
required for each sample location and sample depth. 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 during sampling.
• 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.
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Excavation Soil Sampling Plan
December 2019
Marshall Steam Station
Revision 2
• Stainless steel or plastic spoon — Used for homogenizing soil samples within a stainless
steel or plastic bowl.
• Stainless steel or plastic bowl — Used for homogenizing soil samples, when applicable.
• Camera — Used for photo -documentation of sample locations and samples.
• GPS — Device used to obtain elevation, latitude and longitude of sample location.
• Trash bag — Used to dispose of gloves and any other non -hazardous waste generated
during sampling.
• Decontamination supplies and equipment.
3.1.2 Sample Locations
General locations for soil sampling are determined by the soil scientist in the field at a rate of
one soil sample for every 1 acre of ash basin area excavated. Actual sampling locations on site
may vary to account for site conditions and to allow collection of representative samples.
Representative samples reflect areas where all ash has been visually excavated and natural soil
is observed.
3.1.3 Collection of Representative Samples
For the purpose of this plan, surface soil is considered to range from 0 to 6 inches in depth,
while deeper samples will be collected at a range of 2 to 2.5 feet below ground surface (bgs), 7
to 7.5 feet bgs, 12 to 12.5 feet bgs, and 17 to 17.5 feet bgs (Table 1) unless bedrock, refusal, or
the water table are encountered. A surface soil sample and deeper samples will be collected at
each location for every 1 acre of ash basin excavated. A new pair of nitrile gloves is worn at
each sampling location and each depth. Each sampling location is recorded on the site map
prior to collecting the sample, if location is not already noted on the map. The GPS location of
each sampling location (i.e. elevation, latitude and longitude), sample descriptions, and area
photographs are also recorded. All sampling equipment is decontaminated prior to use
irrespective of depth. The following procedure will be used to collect representative soil
samples with a scoop, shovel, trowel, geoprobe, or excavator:
• Locate general sampling locations.
• Determine suitability of sampling location for a representative sample.
• If sampling location appears to reflect representative conditions that would allow
collection of a representative sample, proceed with sampling procedure. If
location is not indicative of conditions that would allow collection of a
representative sample, notify the project manager so an alternate location can
be identified.
• Using a decontaminated sampling instrument, remove the desired thickness and
volume of soil from the sampling area. The sampler must obtain enough soil to
fill five 8-ounce sample bottles. If a certain six-inch sample interval does not
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Excavation Soil Sampling Plan
December 2019
Marshall Steam Station
Revision 2
yield sufficient soil volume to fill five 8-ounce sample bottles, the sample interval
may be expanded to allow for sufficient soil sample volume. The revised sample
interval should be appropriately documented.
• Transfer the sample into an appropriate sample or homogenization bowl. Non -
dedicated containers should be adequately decontaminated. Stir for
approximately one minute until there appears to be a uniform color and
consistency.
• Transfer homogenized sample to a labeled container(s) of appropriate size and
construction for the analyses requested.
• Secure sample container tightly.
3.1.4 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 2 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 2, 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
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.
3.1.5 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. Detergent wash and brush cleaning
2. Tap water rinse
3. De -ionized water rinse
4. Air dry
5. Wrap sampling tools with plastic
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Excavation Soil Sampling Plan December 2019
Marshall Steam Station Revision 2
4.0 VISUAL CONFIRMATION OF ASH REMOVAL
4.1 Pre -Excavation Documentation
Closure by excavation is defined herein as removing the primary source (primary source of potential
constituents of interest) to the point that ash is not visible to the unaided eye at the ground surface.
Closure by Excavation in this Excavation Soil Sampling Plan, can refer to areas of excavation occurring
under any closure scenario, however Closure by Excavation might not apply to the full basin. Primary
source ash is the main body of ash that was deposited in the basin. This method is intended solely to
verify and document primary source ash removal, and is not intended to validate environmental quality
standards of the subsurface (considered the secondary source of potential constituents of interest).
Pre -excavation documentation would consist of:
• Review topographic mapping, aerial photography, construction drawings, and boring logs to
estimate the pre -ash placement topography and/or ash/soil interface
• Preparation of an ash basin figure illustrating a grid spacing of 100 feet (Figure 1). Each grid
point (node) will be assigned a unique identifier. Each node of the grid spacing (grid point) will
represent a visual verification location.
4.2 Ash Removal Verification Protocol
Ash excavation will be considered complete based on visual and PLM confirmation that all ash has been
removed. Ash removal will be based on sampling of the ash/soil interface and analysis by PLM. Soil
samples will be examined utilizing methods outlined in American Society for Testing and Materials
(ASTM) D2488, Standard Practice for Description and Identification of Soils (Visual -Manual Procedure).
Vertical and horizontal excavation of ash can terminate when the remaining material is documented
using PLM to contain less than 50% ash.
Project will excavate ash until a visible change in color or texture confirms removal of all ash. This
location shall be referred to as the ash/soil interface. If visual evaluation is inconclusive, then request
additional evaluation to confirm ash removal.
4.2.1 Field Documentation
Evaluate the excavated surface elevation relative to the pre -ash placement topography.
Periodically check bottom elevation to evaluate if fill is present above historic bottom elevation.
Visual confirmation will be performed on a 100-foot grid system (Figure 1) unless conditions
prevent such confirmation, as described in Section 4.3. Soil sampling will be performed on a
100-foot grid system and will be analyzed using PLM.
• Personnel will locate each node by GPS or survey control, determine elevation, and
evaluate whether that point is above or below the historic bottom elevation.
Personnel will then observe the surface area represented by the node, to note if visible
ash is present at the surface. If present, the location should be documented and
excavation will need to continue. If the evaluation indicates the surface soils are
residuum or bedrock, then hand auger to two feet below surface (or refusal) and
perform visual -manual classification of the soils at the surface and depth according to
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Excavation Soil Sampling Plan
December 2019
Marshall Steam Station
Revision 2
ASTM method D2488. Submit sample from surface and depth (or shallower if refusal)
for PLM analysis. The conditions shall be documented by taking photographs.
The classification indicator for fly ash will be grey to black silt -sized particles with no
plasticity. The classification indicator for bottom ash will be grey to black sand to gravel
sized particles and porous.
If the node point elevation is near the historic bottom elevation then personnel can
conclude the primary source is removed when the following criteria are met:
1. Residuum is indicated by observation
2. Soil is confirmed by visual manual classification (ASTM D2488) and PLM analysis
less than 50%
4.2.2 Fill Evaluation Criteria
The following procedure provides an approach that can be used to ascertain if the fill can remain
in place. The procedure specified is based on the fill material and depth.
If the elevation is less than eight feet above the historic bottom elevation of the ash
basin and residuum is not observed, test pits may be excavated to historic bottom
elevation or until residuum or bedrock is encountered, but no more than eight feet
below the surface.
o Personnel will evaluate existing information to determine if the test pits are
necessary. If necessary, personnel may recommend excavating test pits at a
frequency no tighter than 100 feet by 100 feet.
o If visible ash is not discovered based on information defined above, the primary
source removal may be confirmed.
o If visible ash is discovered, continue excavation.
• If the elevation is more than eight feet above historic bottom elevation of the ash basin
and residuum is not observed, discuss with CCP Closure Personnel.
o CCP Closure Personnel will confirm historic information and recommend a
drilling and sampling program at a frequency no tighter than 100 feet by 100
feet to evaluate the presence of ash below the fill in accordance with the
information defined above. If unusual features are revealed by the drilling, CCP
Closure Engineering may request/recommend additional borings. Exploration is
to be performed by continuous sampling during drilling.
o If visible ash is not discovered based on information defined above, then the
primary source removal may be confirmed.
o If visible ash is discovered, continue excavation.
4.3 Visual Removal Not Applicable
If possible, excavation of ash should continue even if groundwater is encountered. Visual
documentation is challenging to complete when removal occurs in saturated conditions. Excavation of
ash could be required in areas below the water table or ponded ash intended for removal by dredging.
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Excavation Soil Sampling Plan
December 2019
Marshall Steam Station
Revision 2
A plan will be submitted to NC DEQ by Duke Energy pertaining to the removal of ash if these conditions
or other restricting factors occur.
4.3.1 Boring Method Summary and Analysis
Boring will be conducted using a barge based on a 100-foot grid to visually determine the
ash/soil interface. Below the interface, soil samples will be collected in 1-foot increments for
PLM analysis. Ash presence is quantitatively determined by PLM by Duke Lab or other state
approved vendor. PLM analysis passes visible light through a pair of polarizing filters to create
optical effects used in identifying unknown materials. This method is commonly used in
asbestos and coal ash identification.
For boring samples were PLM results are less than 50% ash, that location will be determined to
be the visual confirmation of the bottom of the ash basin. This bottom basin elevation will be
used to prepare an updated figure showing bottom of ash basin to be used for dredge
operations. Once excavation is complete, confirmation of ash removal depths and elevation will
be submitted to NCDEQ.
4.3.2 Ash Removal
Wet excavated CCR material will be excavated from the ash basin by hydraulic dredging. The
hydraulic dredge will be placed at the water table elevation and utilize a cutting head to excavate
and sluice the CCR material to one of two rim ditches. The hydraulic dredge will excavate material
from an appropriate elevation above mean sea level (AMSL). The dredge will be equipped with
DredgePak GPS and will be loaded with the final grade machine file documenting bottom of ash
as identified in step 4.3.1 above. The dredge will take survey points during excavation to ensure
final grade requirements. GPS coordinates and depths will be provided and will be adhered to
during excavations activities.
5.0 POST EXCAVATION SOIL SAMPLING AND ANALYSIS
5.1 Soil Sampling
Analytical evaluation of s the remaining soils (less than 50% ash per PLM analysis) will be necessary to
evaluate the extent of potential secondary source impacts depending on the depth of the water table
and any proposed institutional or engineering controls that may be used in the area of excavation. Soil
sampling will not be required if refusal or the top of bedrock are encountered, or the remaining soils are
below the water table. Soil samples for laboratory analysis must be collected in a manner that will
ensure a relatively uniform distribution of particles throughout the six inch sample.
The systematic approach and design for soil sampling and analysis is dependent upon two scenarios:
• Scenario 1: Remaining soil (containing less than 50% ash per PLM analysis) is located above the
seasonal high water table and final constructed institutional and/or engineering controls will
restrict infiltration from the surface reaching the water table (e.g. installation of a liner system).
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Excavation Soil Sampling Plan
December 2019
Marshall Steam Station
Revision 2
Scenario 2: Remaining soil (containing less than 50% ash per PLM analysis) is located above the
seasonal high water table and infiltration from the surface would continue to reach the water
table.
5.1.1 Scenario 1
Confirmation sampling will include discrete surface samples collected from the first six inches of
the soil. Sampling will be performed on an acre grid system. This sample collection
methodology shall be sufficient to characterize the horizontal extent of any remaining potential
secondary source impacts for comparison with the NC DEQ Preliminary Soil Remediation Goals
(PSRG). The samples shall be analyzed by a North Carolina certified laboratory for total
concentrations for the parameters defined in Table 2. No SPLP testing is required.
5.1.2 Scenario 2
Confirmation sampling will include collection of both discrete surface and subsurface soil
samples performed on an acre grid system. Discrete surface samples will be collected from the
first six inches of the soil and a subsurface soil sample will be collected at 2 to 2.5 feet below
ground surface (bgs), 7 to 7.5 feet bgs, 12 to 12.5 feet bgs, and 17 to 17.5 feet bgs unless refusal,
bedrock or the water table are encountered. The use of a geoprobe or excavator is anticipated.
This sample collection methodology shall be sufficient to characterize both the horizontal and
vertical extent of any remaining potential secondary source impacts for comparison with the NC
DEQ PSRGs and/or input into the soil leachate model. The samples shall be analyzed by a North
Carolina certified laboratory for both total concentrations and SPLP for the parameter defined
in Table 2.
5.2 Fate and Transport Modeling
Contingency for stabilization of remaining amounts of potential secondary source impacts in a manner
that will meet the intent of North Carolina Groundwater 2L Rules and closure requirements shall be
considered as site conditions dictate. Provisions to develop groundwater flow and transport models to
evaluate protection of groundwater criteria if potential secondary source material are left in place shall
be considered. In addition, the possibility of metals leaching from a potential change in pH and
geochemical conditions related to dewatering and excavation shall be considered along with plans for
groundwater models to assess resulting site conditions.
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Excavation Soil Sampling Plan
December 2019
Marshall Steam Station
Revision 2
TABLE 2 - Soil Parameters and Analytical Methods Totals and SPLP Analysis North Carolina Ash
Basins to be Closed Via Excavation
INORGANIC COMPOUNDS
UNITS
METHOD'
Aluminum
mg/kg or µg/I
EPA 6010D
Antimony
mg/kg or µg/I
EPA 6020E
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 6020E
Calcium
mg/kg or µg/I
EPA 6010D
Chloride
mg/kg or µg/I
EPA 9056A
Chromium
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 µg/I
EPA Method
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 6020B
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 6020E
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) if Scenario 2 is applicable.
Page 9

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1 ■ '-A x x x x x x x x x x '. xq lei 44
pr-, F���
Erma -awn r x A
i x x x x x x x x x x x x x x x x x x x x u � �■
JLA
- 1 _
x x
' 48 ■ �1
�� r_
�i•� .Y�■■■- 49
�� � x x x x x
_ �� ��■�a t5o
ME
-
��
51
■� '
__ 51 x x x x 52
• EL i 53
52SEE !a- �
x x
• • ��� 54
r
55
• , 54
r 7
Ir _
55 man
��� x M� J' ; 56
a
57
J � 1 56 E� on
X.
x x��
ii�■i
a 1 x �� 59
` _ _.. ■ x x x x x x x x ■� 66
x x x x
• M, �, x x x
• : : x `1 xx xx
ErLin x6�-C 62
.•�
■i■i■C■■
� 1 - _
1 62 `163
16
. 63•
fix •SH BASIN
/ • •
64
tiMEN
: it -,■,F
65 { IF x- - 66 r
t r' x x
1 � aa i x ti � 67
• ' x x z 0 , x IF WIPE OEM
. 'J •-2p in / 68
%POLF
• x • �.
f 9��� 1.
70
71
x x x { to- -
-
Ir rar
rumi • tqr
J1■�
73'
EN ir
_Wig T " ,' L
t _ � T T - • _ nI 4 h. 1
1 ;4D AE I AF A H Al AJ AK AL AM AN AO AP AO AR A AV • AW AX ,
G L R 5 T U V W JL
1 ' 1
r �
a
A. , _ - _
yam, • .r •
■L I
jr
jb1 a I. %
ZAVY i L LL ■L
LEGEND
ASH BASIN WASTE BOUNDARY (APPROXIMATE)
CCR MATERIAL EXCAVATION BOUNDARY (APPROXIMATE)
— — — — — EXISTING SITE FEATURES
SPLP AND TM - 1 PER ACRE
PLM ONLY - 10OFT GRID
NOTES
1. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE BASED ON NAVD88.
2. PLM AND SPLP SAMPLING LOCATIONS ARE APPROXIMATE AND ACTUAL PLM AND SPLP
SAMPLING LOCATIONS WILL BE DETERMINED IN THE FIELD.
REFERENCES
1. THE ASH BASIN WASTE BOUNDARY; THE PERIMETERS OF THE 1804 LANDFILL (PHASES I AND II),
STRUCTURAL FILL, FGD LANDFILL, ASBESTOS LANDFILL, AND DEMOLITION LANDFILL; PRESENTED
IN THESE DRAWINGS ARE BASED ON THE "2018 COMPREHENSIVE SITE ASSESSMENT UPDATE,"
PREPARED BY SYNTERRA FOR DUKE ENERGY AND SUBMITTED TO NCDEQ (NPDES PERMIT NO.
NC0004987) ON JANUARY 31, 2018.
2. THE AERIAL PHOTOGRAPH WAS OBTAINED FROM BING (MICROSOFT CORPORATION, 2018).
200'
200'
100,
100'
APPROXIMATE
1 ACRE GRID
N
0 500 1000 1500
GRAPHIC SCALE (IN FEET)
L=com
IOR`-=
OVERALL PROPOSED BORING
LOCATION GRID MAP
MARSHALL STEAM STATION
CLOSURE BY EXCAVATION CLOSURE PLAN
CATAWBA COUNTY, NORTH CAROLINA
FOR
ISSUED FOR APPROVAL
In DUKE
SCALE: AS SHOWN
DES:
JW
DWG TYPE: .DWG
DFTR:
MW
��
ENE RGY
JOB NO: 9
DATE: 12/552 19
ENGR:
RJB
FILENAME:
Boring Locations.dwg
APPD:
JB
DWG SIZE
DRAWING NO.
REVISION
ANSI
22.0"x34.0"
FIGURE 1A
A
70
m
T
7
1

2 3 4 5 6IF 7
-♦.
�ip ♦♦♦♦♦
■
I Ilk NMI- 4m
■ y # +— — —
■
i .d' s ` * * INDUSTRIAL LANDFILL
* • T N O. 1812 ■
• PERMIT ■
Of
T
A _' -
,r
DEMOLITION LANDFILL �
ti - ♦♦ PERMIT NO. 1804 ■
T
- ■•
T ■ ', ' ' ASBESTOS LANDFILL T I T
■ *� - -I I I rI PERMIT NO. 1804
%jII I I oil
dimp_ }
- WIN 4P I jb
-
10
i ■ t - , ` Imo■■ IT m poll
IT i ♦�• ■
At-
■ •
m -9p- I T-
■ a
■
■ + ♦♦ ■ ■
F- -l- - - ----- - T
iLL
i ♦ e • ♦ ♦lift
I - - Lrr.- -L L mp 14 L
MI # 14 �":
- r #♦♦ .
i ■ T ,IT IT IT IT
At
♦ 10
10
♦♦ ♦ ■ ♦ ♦• —
lip T —1 IVF F
",00
.♦ ♦
STRUCTURAL FILL ■
6 i PERMIT NO. CCB0031 ♦ ' ` •••••"�♦ ♦♦♦
■ ■ ' 1 a , —
. • .it 9111
IF
i T ■ • '• �— i♦ * ` 1804 LANDFILL
:� :♦ (PHASE II)
` � 1 if (PHASE • ♦♦♦ ; � � �
16 PERMIT NO.
:• A i ! ♦♦ ,.♦ ♦�♦ - h ♦♦ 1804
#
� _ T
■ i, •••••�■ ■♦�♦♦
■
000
23
_` i ?♦
D ■ .�
� ■ z i
0-7 far
■ ♦ krdo
, ti.� ..♦ 4
f •
■ ♦ -_ L p -
- '
■ ' L +' - i kli
i ■ r I +' —
■ '_ I, M
■
■ ■ -' i � r
- ■ ti 1;� I
■ SOLAR r
' FARM Ir
2 3 4 5 6 7
8 REV. A
LEGEND
ASH BASIN WASTE BOUNDARY (APPROXIMATE)
CCR MATERIAL EXCAVATION BOUNDARY (APPROXIMATE)
EXISTING SITE FEATURES
SPLP AND TM - 1 PER ACRE
PLM ONLY - 10OFT GRID
NOTES
1. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE BASED ON NAVD88.
2. PLM AND SPLP SAMPLING LOCATIONS ARE APPROXIMATE AND ACTUAL PLM AND SPLP
SAMPLING LOCATIONS WILL BE DETERMINED IN THE FIELD.
REFERENCES
1. THE ASH BASIN WASTE BOUNDARY; THE PERIMETERS OF THE 1804 LANDFILL (PHASES I AND 11),
STRUCTURAL FILL, FGD LANDFILL, ASBESTOS LANDFILL, AND DEMOLITION LANDFILL; PRESENTED
IN THESE DRAWINGS ARE BASED ON THE "2018 COMPREHENSIVE SITE ASSESSMENT UPDATE,"
PREPARED BY SYNTERRA FOR DUKE ENERGY AND SUBMITTED TO NCDEQ (NPDES PERMIT NO.
NC0004987) ON JANUARY 31, 2018.
2. THE AERIAL PHOTOGRAPH WAS OBTAINED FROM BING (MICROSOFT CORPORATION, 2018).
200'
200'
100,
100'
APPROXIMATE
1 ACRE GRID
N
0 200 400 600
GRAPHIC SCALE (IN FEET)
A=COM
A�
F--C-1
PROPOSED BORING
LOCATION GRID MAP
MARSHALL STEAM STATION
CLOSURE BY EXCAVATION CLOSURE PLAN
CATAWBA COUNTY, NORTH CAROLINA
FOR
ISSUED FOR APPROVAL
DUKE
ENERGY
SCALE: AS SHOWN
DES: JW
DWG TYPE: .DWG
DFTR : MW
JOB NO: 60572849
CHKD: RJB
rDATE.7 12/5/2019
ENGR : RJB
FILENAME:
Boring Locations.dwg
APPD: JB
DWG SIZE
DRAWING NO.
REVISION
ANSI D
22.0"x34.0"
FIGURE 113
A

ML {
IF A
4 5 6
Ilk,
qp
db AP �■
111 0 �,A
INDUSTRIAL LANDFILL ' 4f 1 .. d, 1111&%dl� so tv t x 6
PERMIT NO. 1812 ■
eq ■ i i #
} It 4 9 . . m4P
hpdW OWN— 1-1 - 0
a 1 1 1 1 1 1 1 1 F.
-
■ fAN {';
Op 4L
Ile DEMOLITION LANDFILL ♦ _ d,
PERMIT NOi 1804 :: I F
0 or
— —I A I i ♦ ■
ASBESTOS LANDFILL • ' PERMIT NO. 1804 Ll j__ _L —1— 1 _ � � L � � L � - I �—
w
' 11L ♦ ■ ♦ -1
♦ ■ ♦ ri k
so
ita
PL 'T F —1 F_ —1 T
lop, T
♦ 4146.
♦ ♦ ■
■ ♦ ♦ , r ti 4
f S■ ■ ♦ i +
All� i ♦ I; ■
4,• ■ ♦ '�`
1 ■ �' e •
IV IF
-F ee 0
`-w
L —1 L —1 Ir LI — — ". — .— I —
I man
IF -ft
F ' ■ ,
.♦'- - 1804 LANDFILL —� + k+_ —4 T
e♦♦ ■ (PHASE II) -
♦♦♦ i F PERMIT NO.
10 ilk.
1804 t _ �
jr
TOr T •
♦ dE
IF 9E
ee♦
i
ee �+ F IL
ee —
��Or
I�
» : F r
Lip
T T F_Tom' , T F_ T '.T F_T - F_ T .I T T T- T_
4. ■■♦ ■ r
,
41,
■
ri
1
7
i
■
Oki t ief ■
T T+ 'I
•� ,
At Ark
♦ , on
*" k
2 3 4 5 6 7
8 REV. A
LEGEND
ASH BASIN WASTE BOUNDARY (APPROXIMATE)
CCR MATERIAL EXCAVATION BOUNDARY (APPROXIMATE)
EXISTING SITE FEATURES
SPLP AND TM - 1 PER ACRE
PLM ONLY 10OFT GRID
NOTES
1. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE BASED ON NAVD88.
2. PLM AND SPLP SAMPLING LOCATIONS ARE APPROXIMATE AND ACTUAL PLM AND SPLP
SAMPLING LOCATIONS WILL BE DETERMINED IN THE FIELD.
REFERENCES
1. THE ASH BASIN WASTE BOUNDARY; THE PERIMETERS OF THE 1804 LANDFILL (PHASES I AND 11),
F STRUCTURAL FILL, FGD LANDFILL, ASBESTOS LANDFILL, AND DEMOLITION LANDFILL; PRESENTED
IN THESE DRAWINGS ARE BASED ON THE "2018 COMPREHENSIVE SITE ASSESSMENT UPDATE,"
PREPARED BY SYNTERRA FOR DUKE ENERGY AND SUBMITTED TO NCDEQ (NPDES PERMIT NO.
NC0004987) ON JANUARY 31, 2018.
2. THE AERIAL PHOTOGRAPH WAS OBTAINED FROM BING (MICROSOFT CORPORATION, 2018).
200'
200'
100,
100'
APPROXIMATE
1 ACRE GRID
N
0 100 200 300
GRAPHIC SCALE (IN FEET)
A=COM
A�
F__('i_1
PROPOSED BORING
LOCATION GRID MAP
MARSHALL STEAM STATION
CLOSURE BY EXCAVATION CLOSURE PLAN
CATAWBA COUNTY, NORTH CAROLINA
FOR
ISSUED FOR APPROVAL
DUKE
ENEnlo***%/JOB
SCALE: AS SHOWN
DES: JW
DWG TYPE: .DWG
DFTR : MW
N0: 60572849
CHKD: RJB
DATE: 12/5/2019
ENGR : RJB
FILENAME:
Boring Locations.dwg
APPD: JB
DWG SIZE
DRAWING NO.
REVISION
ANSI D
22.0 x34..0"
FIGURE 1 C
A

2 3 4 5
-ft♦�i i -
} i
df
IF
rr
■ , ' • -
WAIN
I T F T
• ■ ` SOLAR •
♦ FARM_L
} ♦e * 10
T+ T • T T :T� d T T T �. T T. �
♦ STRUCTURAL FILL
lk
�♦♦ PERMIT NO. CCB0031
-
4r
,too
—A ' W_
+ � I M + � --I A
be
♦ �•
i
STRUCTURAL FILL 1 '
S ROAD •rp ' — ACCESS ROAD .. F_ 1 T T 1 T ��
PERMIT NO. CCB0030 FGD CONSTRUCTED
WETLANDS T
qp TREATMENT AREA
♦ ♦4 . ` + r
♦ •f
��� �� -
1.44
&Z
♦r 4
1Miiio - + �
A *0
IL
III T
�10 ■u■ ' NJ I
+ - L11 r T
T , — �— T -
•T + T T T
ON
r * r01 —7 -
F#`
r 4ft
T L T T ♦'. T; L. J— T
*+ ♦ I FGD I ♦♦♦ -
' I I ♦
LANDFILL PERMIT I � +
• NO. 1809
� •♦ • :p I
NINE
• ♦ I •♦♦
■ I� ♦ : ♦ �
♦ ♦� ♦�
"040
1 ♦ . •♦ ♦♦♦ ♦ ♦ i -
# ■ ♦ ♦♦ -J.
IV
i
■ ♦ ♦♦ •� ~_
♦ •♦♦ � • �
i ♦♦ ♦♦♦ ' LINED I ♦� ' ' F _ _
10- RETENTION
`0 'Vol� BASINS .• ♦♦ -
• w
- IN
• u
116
1 ■
■
2 3 4 5
1 1 1
6 7 8 REV. A
• LEGEND
ASH BASIN WASTE BOUNDARY (APPROXIMATE)
CCR MATERIAL EXCAVATION BOUNDARY (APPROXIMATE)
IN
T F EXISTING SITE FEATURES
SPLP AND TM - 1 PER ACRE
PLM ONLY - 10OFT GRID
NOTES
T
•- 1. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE BASED ON NAVD88.
2. PLM AND SPLP SAMPLING LOCATIONS ARE APPROXIMATE AND ACTUAL PLM AND SPLP
SAMPLING LOCATIONS WILL BE DETERMINED IN THE FIELD.
REFERENCES
1. THE ASH BASIN WASTE BOUNDARY; THE PERIMETERS OF THE 1804 LANDFILL (PHASES I AND 11),
STRUCTURAL FILL, FGD LANDFILL, ASBESTOS LANDFILL, AND DEMOLITION LANDFILL; PRESENTED
■ IN THESE DRAWINGS ARE BASED ON THE "2018 COMPREHENSIVE SITE ASSESSMENT UPDATE,"
PREPARED BY SYNTERRA FOR DUKE ENERGY AND SUBMITTED TO NCDEQ (NPDES PERMIT NO.
NC0004987) ON JANUARY 31, 2018.
V.,CL
2. THE AERIAL PHOTOGRAPH WAS OBTAINED FROM BING (MICROSOFT CORPORATION, 2018).
r 200'
a
200'
i' 100, B
w�
� 100'
� APPROXIMATE
1 ACRE GRID
IN
� � T
N� -
---I— _T_ _F___1
N
_Np C
T T
0 200 400 600
TGRAPHIC SCALE (IN FEET)
IN m
<
7 , 71
OF
' _IN
' 4
� � t
PROPOSED BORING
LOCATION GRID MAP
MARSHALL STEAM STATION
CLOSURE BY EXCAVATION CLOSURE PLAN
CATAWBA COUNTY, NORTH CAROLINA
IF FOR
ISSUED FOR APPROVAL
OF jpd& SCALE: AS SHOWN DES: JW
COAL PILE
DUKE DWG TYPE: .DWG DFTR : MW
ENERGY JOB �DATEN012/552019 9 ENGR : RJB
AG AH AlAM AN ` • AP FILENAME: Boring Locations.dwg APPD: JB
DWG SIZE DRAWING NO. REVISION
ANSI D FIGURE 1 D A
22.0"x34.0"
I
7
L

2 3 4 5 6 7 8 REV. A
r ♦ ■
#. = ; # LEGEND
■ • II.
T - ♦ y ■ 1804 LANDFILL 1 mill,
ASH BASIN WASTE BOUNDARY (APPROXIMATE)
i ,♦
�� _ ■ # ■ (PHASE 1) PHASE I SOIL • _ CCR MATERIAL EXCAVATION BOUNDARY (APPROXIMATE)
f- —� �— + El�' PERMIT NO. 1804 BORROW
RRI
(APPROX.AREA
{ +
T � C : LOCATION) EXISTING SITE FEATURES
J '♦ � ♦ - � - ,� � ' SPLP AND TM - 1 PER ACRE
• + ♦1 F '►, '•"�� ♦♦ - _ " + �.�� PLM ONLY - 10OFT GRID
-T
.1 'T F_ —1
T-O?
- T
IRE I
mill -M------•' NOTES
4 S GS G / O S O
x x x x x x x x x x x x - 42 --
x x x x x x x x x x x x x 43 1_
xi
x x x x x x x x x x x x x x - 44
lot
9 ■
I ♦,'
T ■ 1♦-♦ ■ rT Ito
i T AUXILIARY 1
_ �' SPILZ
LLWAY
94ar
,L
1 ■
"x x mill
mill EML
JL
IL 0
_Al X111,
59
■ I. 1 a, ASH BASIN DAM .1
' ■ i ' � _ — _r�_ +
• •
1 + 4+ + , 1
-I IF •
r f
WTS AREA
1. BA IS OF BEARIN . NC RID NAD83 2011. ELEVATI N ARE BASED N NAVD88.
2. PLM AND SPLP SAMPLING LOCATIONS ARE APPROXIMATE AND ACTUAL PLM AND SPLP
SAMPLING LOCATIONS WILL BE DETERMINED IN THE FIELD.
oil •� REFERENCES
1. THE ASH BASIN WASTE BOUNDARY; THE PERIMETERS OF THE 1804 LANDFILL (PHASES I AND 11),
_ STRUCTURAL FILL, FGD LANDFILL, ASBESTOS LANDFILL, AND DEMOLITION LANDFILL; PRESENTED
IN THESE DRAWINGS ARE BASED ON THE "2018 COMPREHENSIVE SITE ASSESSMENT UPDATE,"
PREPARED BY SYNTERRA FOR DUKE ENERGY AND SUBMITTED TO NCDEQ (NPDES PERMIT NO.
NC0004987) ON JANUARY 31, 2018.
2. THE AERIAL PHOTOGRAPH WAS OBTAINED FROM BING (MICROSOFT CORPORATION, 2018).
y � J�
•,
�• ySOON ME
A main pm IN
1
jp I . I I * #* * I - - I I - L q% q III I x4i
♦ 1♦ 1
�7
68 jm
X.x , x - � — , 69 .
s a
a + 70 ' ..
x 4/ a 71 Aa
- -Aw ;
F_ . � 1 72 " 1
NL� A#�10
+ 73
IN r
_ _
+ I I 74 F — 0
AG AH Al AJ J AK AL AM AN AO AP AQ AR AS a ■' ' • • AZ BA BB BC D
200'
i
200'
100,
100,
APPROXIMATE
1 ACRE GRID
N
0 200 400 600
GRAPHIC SCALE (IN FEET)
A=COM
�A�
�c�
PROPOSED BORING
LOCATION GRID MAP
MARSHALL STEAM STATION
CLOSURE BY EXCAVATION CLOSURE PLAN
CATAWBA COUNTY, NORTH CAROLINA
FOR
ISSUED FOR APPROVAL
DUKE
ENERGY
SCALE: AS SHOWN
DES: JW
DWG TYPE: .DWG
DFTR : MW
JOB NO: 60572849
CHKD: RJB
DATE : 12/5/2019
ENGR : RJB
FILENAME:
Boring Locations.dwg
APPD: JB
DWG SIZE
DRAWING NO.
REVISION
ANSI D
22.0"x34.0"
FIGURE 1 E
A
m
D
6 7
1 1