1812_DukeMarshall_Phase2Cell6_PLM Results_Report 2_FID1626961_20211213

December 13, 2021
Duke Energy Marshall Steam Station
EHS Groundwater & Waste Programs
8320 NC Highway 150
Terrell, North Carolina 28682
Attention: Ms. Ashley Albert, P.G.
Reference: Clean Closure Verification - Visual Confirmation and PLM Results
Duke Energy Marshall Steam Station
Confirmatory Soil Sampling — Marshall Steam Station Ash Basin Closure
S&ME Project No. 212013, Ph. 06
Ms. Albert:
S&ME, Inc. (S&ME) is submitting the enclosed summary of results supporting the removal of Coal Combustion
Residuals (CCR) by visual verification and Polarized Light Microscopy (PLM) analysis results adjacent to the
footprint of the future Cell 6, Phase 2, of Industrial Landfill No. 1 at Duke Energy's Marshall Steam Station, located
in Catawba County, North Carolina. This summary letter is provided so that the North Carolina Department of
Environmental Quality Solid Waste Section (NCDEQ — SWS) may review PLM analytical results prior to our formal
reports that document our full clean closure verification field activities.
We have attached to this letter Table 1 — PLM Sample Results and Soil Sampling Summary which includes soil
sample descriptions, including visual verification that CCR material has been removed as well as the supporting
PLM analysis results for samples collected by S&ME personnel on December 111, 2021. A corresponding map,
Figure 1 — PLM Sampling Locations is enclosed as well, depicting sample locations within the ash basin and
adjacent to the southern boundary of the future Cell 6 footprint that have been sampled and analyzed using the
PLM method for CCR. Please note that all samples collected on December 1IY, 2021 contained less than 5% CCR.
The clean closure benchmark value for CCR material in soil samples is 50%.
S&ME thanks you for your receipt of these records. Should you have any questions or need additional
information, please do not hesitate to contact us at [phone].
Respectfully Submitted,
5&ME, Inc.
UALKV -C f
Jasmine Tayouga Michael T. Romane lo, P.E.,
Associate Project Manager Project Engineer/Manager
S&ME, Inc. 12016 Ayrsley Town Blvd., Suite 2-A I Charlotte, NC 282731 p 704.523.4726 1 www.smeinc.com

December 13, 2021
EHS Groundwater & Waste Programs Page 2
Senior Reviewed By:
ec1
Julie P. Robertson, P.G. (Registration No. 199S)
oEF]:lvsi uel,Si ••
Enclosures: Table 1 — PLM Results and Soil Sampling Summary, Figure 1 — PLM Sampling Locations
cc: James Malloy, Project Manager, Duke Energy Marshall Steam Station
S&ME, Inc.

Table 1: PLM Sample Results and Soil Sampling Summary
PLM Results
Marshall Steam Station Ash Basin Closure
S&ME Project Number: 212013, Ph. 06
S&ME Sample
ID
ProposedDuke
Proposed
Energy
Date Collected
Actual
Sample
Sample Description and Commen
Sample ID
Column Row
Sample
Depth
Northing
Easting
Northing
Easting
Yes
No
Date Received Results
Depth'
Lean Clay with Sand (CL) - reddish brown, medium plasticity, fine sand,
12/1/2021
2021032161
V 11
0"-6"
0"-6"
1413861.5
685816.2
1413858.8
685810.3
X
12/7/2021 ND
micaceous [RES].
Sandy Lean Clay (CL) - yellowish brown, medium plasticity, fine sand,
12/1/2021
2021032162
V
11
2'-2.5'
2'-2.5'
1413861.5
685816.2
1413858.8
685810.3
X
12/7/2021
ND
micaceous [RES].
Silty Sand (SM) - reddish brown, fine to medium, non to low plasticity fines,
12/1/2021
2021032163
W
11
0"-6"
0"-6"
1413941.1
685807.6
1413904.8
685793.0
X
12/7/2021
4%
micaceous [RES].
Sandy Lean Clay (CL) - reddish brown, medium to low plasticity, medium
12/1/2021
2021032164
W
11
2'-2.5'
2'-2.5'
1413941.1
685807.6
1413904.8
685793.0
X
12/7/2021
ND
sand, micaceous [RES].
Sandy Lean Clay (CL) - reddish brown, gray, medium plasticity, fine to
12/1/2021
2021032165
V
10
0"-6"
0"-6"
1413859.6
685884.7
1413848.6
685902.6
X
12/7/2021
3%
coarse sand, micaceous [RES & ALLUVIAL]. Water encountered
approximately 10 inches below ground surface.
Clayey Sand (SC) - blue, gray, coarse to fine sand, medium plasticity fines
12/1/2021
2021032166
W
10
0"-6"
0"-6"
1413948.7
685899.5
1413940.2
685894.4
X
12/7/2021
ND
[ALLUVIAL]. Water encountered approximately 1 foot below ground
surface.
Clayey Sand (SC) - gray, bluish gray, medium to coarse sand, medium to
12/1/2021
2021032167
X
10
0"-6"
0"-6"
1414028.3
685923.7
1414015.9
685910.6
X
12/7/2021
ND
high plasticity fines, micaceous [RES & ALLUVIAL]. Water encountered
approximately 8 inches below ground surface.
Notes:
(1) For the purposes of PLM method, Fly Ash is defined as any particle consistent with Coal Ash (CCR).
(2) ND = Not Detected. The PLM Method Reporting Level is 1%; samples with less than 1% CCR are considered ND.
'Actual sample depths may vary due to sampling method and volume of soil needed for laboratory testing.
ZCCR = Coal Combustion Residuals
3Residual Material (RES): Residuum and Saprolitic material that is a product of weathered bedrock.
Alluvial Material (ALLUVIAL): unconsolidated material deposited by rivers and streams.
Partially Weathered Rock (PWR): Defined as material that could not be penetrated by hand auqer or qeoprobe; or had a standard penetration resistance of N>50 usinq when SPT sampling with a drill riq.
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CONFIRMATORY SAMPLING\GIS AND
Map_20211213.mxd plotted byjtayouga 12-13-2021
INDUSTRIAL LANDFILL NO. 1 (1812-INDUS)
PHASE 2 EXPANSION �. 1� � ; >} -
CELL 6 � �
i
i
V W X Y Z�•
9
10
4e
CIE • i 11
• CIE 12
i
�/• LEGEND
0 250 500 SAMPLES COLLECTED 12/1/2021 FOR PLM ANALYSIS AND RESULTS RECEIVED - CCR < 50%
1 ik
(FEET) PREVIOUS REPORTED SAMPLES COLLECTED FOR PLM ANALYSIS AND RESULTS RECEIVED - CCR < 50%
• REPRESENTATIVE SAMPLE LOCATIONS
REFERENCE:
AERIAL BASE LAYERS WERE OBTAINED FROM TRANS ASH ON 11-1-21. THIS MAP IS FOR PLM ONLY SAMPLE LOCATIONS
INFORMATIONAL PURPOSES ONLY. ALL FEATURE LOCATIONS DISPLAYED ARE ••�� LANDFILL CELL BOUNDARIES
APPROXIMATED. THEY ARE NOT BASED ON CIVIL SURVEY INFORMATION, UNLESS STATED
OTHERWISE. — SAMPLING GRID
SCALE: FIGURE NO.
POLARIZED LIGHT MICROSCOPY (PLM) SAMPLING LOCATIONS 1 " = 250 '
DATE:
III E DUKE ENERGY - MARSHALL STEAM STATION 12-13-2021
CATAWBA COUNTY, NORTH CAROLINA PROJECT NUMBER
212013 PH. 06