1812_DukeMarshall_LeachateBasin_visual_FID_20211108

(' DUKE
ENERGY-.
November 8, 2021
North Carolina Department of Environmental Quality
Division of Waste Management
Solid Waste Section
1646 Mail Service Center
Raleigh, North Carolina 28778
Attn: Ms. Sarah Moutos (submitted electronically)
Re: Geologic Subgrade Observation Report
Industrial Landfill No.1
Permit No.: 1812-INDUS-2008
Marshall Steam Station
Terrell, North Carolina 28682
Dear Ms. Moutos:
526 South Church St.
Charlotte, NC 28202
Mailing Address
P.O. Box 1006
Mail Code EC 13K.
Charlotte, NC 28201-1006
717-982-0986
Duke Energy is submitting the Geologic Subgrade Observation report for the leachate basin currently under
construction and associated with the Industrial Landfill No.1 (ILF, 1812-INDUS-2008). The observation report
was prepared by S&ME, on behalf of Duke Energy. S&ME personnel were present during grading activities
related to the construction of the Ieachate basin and observed the geologic conditions exposed after
excavation. The report notes observations were generally consistent with the site geology described in
AECOM's Geological and Hydrogeological Report for the ILF Phase 2 expansion. This submittal includes the
following documentation:
• Geologic Subgrade Observations — Marshall Steam Station — ILF Leachate Basin (S&ME, 2021)
o Attachment — Photographic Log
If you have any questions or need clarification regarding this submittal, please contact me at
Ashley.Albert(a�duke-energy.com or [phone].
Respectively,
Ashley Albert, P.G.
Environmental Services
Attachments: Geologic Subgrade Observations — Marshall Steam Station — ILF Leachate Basin; S&ME,
2021
cc (via e-mail): Elizabeth Werner, NCDEQ
Ben Jackson, NCDEQ
Larry Frost, NCDEQ
Sherri Stanley, NCDEQ
Kyle Baucom, Duke Energy
Chris Varner, Duke Energy
Julie Roberston, S&ME
Ryan Czop, Duke Energy
www.duke-energy.com Page 1 of 1

November 5, 2021
Duke Energy
526 S. Church Street
Charlotte, NC 28202
Attention: Ms. Ashley Albert
Reference: Geologic Subgrade Observations
Marshall Steam Station — ILF Leachate Basin
Terrell, North Carolina
S&ME Project No. 212013
Dear Ms. Albert:
S&ME, Inc. (S&ME) is pleased to provide our Geologic Subgrade Observations for the Marshall Steam Station
Industrial Landfill (ILF) Leachate Basin located in Terrell, North Carolina. In accordance with the facility's Permit to
Construct dated January 21, 2021, S&ME personnel were present during grading activities related to the
construction of the leachate basin as well as the adjacent temporary soil stockpile area and were able to observe
the geologic conditions exposed after excavation. This report presents our observations and conclusions.
Observations
Visual observations were performed by Jasmine Tayouga, EIT and Julie Robertson, P.G. (N.C. Licensed Geologist
No. 1995) during the period of July 2021 to November 2021 following excavation of the leachate basin through
progression of liner installation. The temporary soil stockpile area for the leachate basin spoils located
immediately south of the leachate basin was also observed. The subgrade was visually observed for evidence of
structural features that may influence groundwater flow or denote that separation requirements of groundwater
and bedrock have not been achieved.
The general geology in the leachate basin and temporary soil stockpile area consisted of tan to reddish tan sandy
silts with trace granitic structure and manganese staining present as shown in the attached photographic log.
There were no linear structural features present or exposed rock to obtain strike and dip measurements that were
observed. Observations were generally consistent with the site geology described in AECOM's Geological and
Hydrogeological Report for the ILF Phase 2 expansion.
Qualifications
This report provides our periodic visual observations made following excavation of the leachate basin. Visual
observations were made at surface level and there is potential that concealed features may be present. Any
conditions discovered which deviate from the observations presented in this report should be provided to us for
evaluation.
S&ME, Inc. 12016 Ayrsley Town Blvd. Suite 2-A I Charlotte, NC 28273 1 p 704.523.4726 1 www.smeinc.com

Geologic Subgrade Observations
Marshall Steam Station — ILF Leachate Basin
Terrell, North Carolina
S&ME Project No. 212013
Closing
S&ME appreciates this and every opportunity to be of service to Duke Energy. Should you have any questions
regarding this information please do not hesitate to contact us.
Sincerely,
S&ME, Inc.
Jasmine Tayouga, EIT
Associate Project Manager
Attachments: Photographic Log
ZZ
Julie P. Robertson, P.G.
Principal Geologist / Group Leader
November 5, 2021 2

Attachment I — Photographic Log

7 Photographic Log
Geologic Subgrade Observations
Marshall Steam Station Leachate Basin
Terrell, North Carolina I I
S&ME Project No. 212013
PHOTO
1
NFL
Direction:
West
Location
Leachate Basin
Description:
Exposed subgrade during test pad installation.
PHOTO
2
Direction:
North
Location
- ---- = -
Leachate Basin
Description:
Exposed subgrade during test pad installation.
Page 1 of 4

Photographic Log
Geologic Subgrade Observations
Marshall Steam Station Leachate Basin
Terrell, North Carolina I I
S&ME Project No. 212013
PHOTO
3
Direction:
NW
Location
Leachate Basin
Description:
Exposed subgrade during test pad installation.
PHOTO
4
Direction:
Surface
-
Location
�
41,
-
�"�
Leachate Basin
Description:
Highly decomposed granitic saprolite that could be easiliy broken by hand. Classified as Tan Sandy
Silt. Typical of subgrade soils encountered.
Page 2 of 4

Photographic Log
Geologic Subgrade Observations
Marshall Steam Station Leachate Basin
Terrell, North Carolina I I
S&ME Project No. 212013
PHOTO
5
,
F.
4:
..
Direction:
Surface
r,,�
Location
-
Y.•
Leachate Basin
r. f
li J
YCC 4� J �
Description:
Managanese deposits within soils. Typical of subgrade soils encountered.
PHOTO
6
Direction:
'
North
Location
Temporary Soil
Stockpile Area in
foreground with
Leachate Basin in
background.
Description:
Temporary Soil Stockpile area for the leachate basin soils.
Page 3 of 4

Photographic Log
Geologic Subgrade Observations
Marshall Steam Station Leachate Basin
Terrell, North Carolina I I
S&ME Project No. 212013
PHOTO
7
w
`
Direction:
South
Location
# w `
-j .ems
Temporary Soil
Stockpile Area
Description:
Temporary Soil Stockpile Area for the leachate basin soils.
PHOTO
8
3,
Direction:
North
rr' ' g.
Location
Leachate Basin
Description:
Cut wall for anchor trench.
Page 4 of 4