HomeMy WebLinkAbout3620_DukeEnergy_Allen_SSLF_GWInfo_FID1636958_20220114(> DUKE
ENEnNr1**%1%.7.
January 14, 2022
North Carolina Department of Environmental Quality
Division of Waste Management
Solid Waste Section
1646 Mail Service Center
Raleigh, North Carolina 28778
Attn: Mr. Edward Mussler, PE (submitted electronically)
526 South Church Street:
Mail Code EC13K
Charlotte, North Carolina 28202
704-382-7171
Re: Response to Item. No. 1 — NCDEQ Letter dated 12/15/2021 — Vertical Separation and Hold of
PTC at South Starter Landfill
Allen South Starter Landfill (SSLF)
Permit No.: 3620-INDUS
Allen Steam Station
Gaston County, North Carolina
Dear Mr. Mussler,
As requested in item number (1.) of your letter dated December 15, 2021 with subject Vertical Separation
and Hold of PTC at South Starter Landfill, Duke Energy Carolinas (Duke Energy) is submitting, within 30
days of receipt of respective letter, the attached groundwater information for the South Starter Landfill
(SSLF) (Permit No. 3620-INDUS) at the Allen Steam Station in Gaston County, North Carolina.
The attached two drawings depict Duke Energy's most recent site -wide water level measurement event
(November 29, 2021) shallow groundwater elevation surface and the adjusted long-term seasonal high
groundwater elevation surface modeled using the previously approved methodology in 2020 for both the
SSLF and the leachate basin. The requested groundwater contour sets are shown over the proposed
compacted soil liner elevations for both the SSLF and the leachate basin.
The attached four Excel files supply the raw data for the November 29, 2021 groundwater elevation
surface and the modeled long-term seasonal high groundwater elevation surface. The last three of the
four Excel files as listed below under attachments to this letter are specific to the modeled groundwater
surface and include: 1) precipitation data shown in plots; 2) estimated water levels from the model, the
statistically derived long-term seasonal high groundwater elevations, model residuals, and calculated
normalized distribution values for the residuals; and 3) water level data that was entered into the R code
developed by Kara Marsac to do the statistical calculations and to develop the hydrographs shown in the
technical memorandum previously provided as Appendix VI of the Geological and Hydrogeological Report
for the Allen CCR Closure Landfills (3619-, 3620-, and 3621-INDUS).
If you need additional information, do not hesitate to email or call me at Courtney.Murphy(b)-duke-
energy.com or (704) 382-7171.
Respectfully, ?
dw�w-ffkol
Courtney W. Murphy, P.G.
Environmental Services
www.duke-energy.com Page 1 of 2
Attachments (6):
Drawings (2): Groundwater Overlay — SSLF Compacted Soil Liner Subgrade
(AECOM, 2022)
Groundwater Overaly — Leachate Basin Compacted Soil Liner Subgrade
(AECOM, 2022)
Excel Files(4): 2021 Q4 ALN Shal GW Data Pts.xlsx
Allen_precip input.xlsx
ALN RechargeResid NormDist.xlsx
LTSH InputData—ALN
cc (via e-mail): Jordan Russ, NCDEQ
Sarah Moutos, NCDEQ
Sherri Stanley, NCDEQ
Claire Osborn, NCDEQ
Ed Sullivan, Duke Energy
Kimberlee Witt, Duke Energy
Tyler Hardin, Duke Energy
Ryan Czop, Duke Energy
Henry Duperier, Duke Energy
Steve Pulley, Duke Energy
www.duke-energy.com Page 2 of 2
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------- 620 --------
LEGEND
DUKE ENERGY PROPERTY BOUNDARY
LANDFILL LIMITS OF WASTE
EXISTING MAJOR CONTOUR (10 FT)
EXISTING MINOR CONTOUR (2 FT)
PROPOSED MAJOR CONTOURS (10 FT)
PROPOSED MINOR CONTOUR (2 FT)
HISTORIC BOTTOM OF ASH MAJOR CONTOURS (10 FT)
HISTORIC BOTTOM OF ASH MINOR CONTOUR (2 FT)
620 — EXISTING GROUNDWATER ELEVATION (NOVEMBER 29, 2021)
620 — ADJUSTED LONG TERM SEASONAL HIGH POST -EXCAVATION
GROUNDWATER ELEVATION (SEE NOTE 3)
GUARD RAIL
X —X —X -
X — X — X -
[7-:F—�
++++++++++ + + + + + + + + +
+ + + + + + + + + +
+ + + + + + + + + + +
100-YR
0.
0
AIl1TCC`
FENCE
EXISTING ROAD
EXISTING TREELINE
EXISTING FENCE
EXISTING WETLANDS
DELINEATED STREAM
100 YR FLOOD LINE
PERIMETER ROAD
GROUNDWATER
MONITORING WELL
1. THIS PLAN REPRESENTS SOIL FILL PLACED AFTER THE AREA OF THE ASH BASIN NEEDED FOR CLOSURE
OF THIS LANDFILL IS CLOSED BY EXCAVATION IN ACCORDANCE WITH A CLOSURE PLAN APPROVED BY
NCDEQ. AREAS OF THE ASH BASIN THAT REQUIRE SOIL FILL FOR THIS LANDFILL CONSTRUCTION SHALL BE
DEEMED CLOSED BY EXCAVATION PRIOR TO PLACEMENT OF FILL.
2. GRADES SHOWN WITHIN THE LOW REFLECT THE BASE OF COMPACTED SOIL LINER WHICH IS COMPRISED
OF TOP OF NATIVE SOIL AND/OR REQUIRED SOIL FILL.
3. INCLUDES A FACTOR OF SAFETY OF 2.5 FEET ADDED TO THE ESTIMATED LONG TERM SEASONAL HIGH
GROUNDWATER ELEVATION DEVELOPED AND MODELED BY SYNTERRA (2020) USING APPROVED
METHODOLOGY AS DESCRIBED IN APPENDIX VI OF THE GEOLOGICAL AND HYDROGEOLOGICAL REPORT -
ALLEN STEAM STATION - CCR CLOSURE LANDFILL UNITS (3619-, 3620- AND 3621-INDUS) - REVISION 0
(AECOM, 2020).
LANDFILL LINER SYSTEM
NOT TO SCALE
0 100 200 3C
GRAPHIC SCALE (IN FEET)
TITLE
A=COM
N.C. ENGINEERING LICENSE NO. I FOR
F-0342
3" CCR OPERATIONAL BUFFER
V MIN. PROTECTIVE COVER LAYER
'S GEOCOMPOSITE DRAINAGE LAYER
)-MIL HDPE PRIMARY GEOMEMBRANE
LDS GEOCOMPOSITE DRAINAGE LAYER
&MIL HDPE SECONDARY GEOMEMBRANE
GEOSYNTHETIC CLAY LINER
?" COMPACTED SOIL LINER,
•_
< 1.0 X 10-5 cm/s
O
ATURAL SOIL OR SOIL FILL
1 REV 1 DATE 1 APPD 1 DESCRIPTION
GROUNDWATER OVERLAY -SSLF
COMPACTED SOIL LINER SUBGRADE
SSLF (3620-INDUS)
ALLEN STEAM STATION
GASTON COUNTY, NORTH CAROLINA
ISSUED FOR REVIEW
SEAL SCALE: AS SHOWN
j DUNCE DWG TYPE:. DWG
�� JOB N0: 60603204
E RGY®
C DATE: 1-14-22
FILENAME: GW OVERLAY 022 - SSLF COMPACTED SOIL LINER SUBGRADE GRADING
DWG SIZE I DRAWING NO.
ANSI D
22.0"x34.0"
1
DES : AG
DFTR : AG
CHKD: JDM
ENGR: JDM
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REVISION
U
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1 1 REV. 0
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--------------
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625
CURRENT LAYER SHOWN
OE
625
625 —
KinTCC
LEGEND
EXISTING MAJOR CONTOUR (10 FOOT)
EXISTING MINOR CONTOUR (2 FOOT)
HISTORIC MAJOR CONTOUR (10 FOOT)
HISTORIC MINOR CONTOUR (2 FOOT)
PROPOSED MAJOR CONTOUR (10 FOOT)
PROPOSED MINOR CONTOUR (2 FOOT)
DUKE ENERGY PROPERTY BOUNDARY
APPROXIMATE ASH BASIN WASTE BOUNDARY
BRUSH AND TREE LINE
EXISTING OVERHEAD TRANSMISSION LINES
ADJUSTED LONG-TERM SEASONAL HIGH GROUNDWATER (SEE NOTE 3)
EXISTING GROUNDWATER ELEVATION (NOVEMBER 29, 2021)
GUARDRAIL
GROUNDWATER MONITORING WELL
WATER LEVEL MONITORING PIEZOMETER
1. BOTTOM OF LEACHATE BASIN ELEVATIONS HAVE BEEN SET TO MAINTAIN A MINIMUM
VERTICAL SEPARATION OF 1 FOOT FROM MARCH 2O21 GROUNDWATER ELEVATIONS.
2. GRADES SHOWN OUTSIDE THE LIMITS OF THE EXISTING ASH BASINS ARE EXISTING
GRADES. GRADES SHOWN INSIDE THE LIMITS OF THE EXISTING ASH BASINS ARE
HISTORICAL BOTTOM OF ASH GRADES.
3. INCLUDES A FACTOR OF SAFETY OF 2.5 FEET ADDED TO THE ESTIMATED LONG TERM
SEASONAL HIGH GROUNDWATER ELEVATION DEVELOPED AND MODELED BY SYNTERRA
(2020) USING APPROVED METHODOLOGY AS DESCRIBED IN APPENDIX VI OF THE
GEOLOGICAL AND HYDROGEOLOGICAL REPORT - ALLEN STEAM STATION - CCR CLOSURE
LANDFILL UNITS (3619-, 3620- AND 3621-INDUS) - REVISION 0 (AECOM, 2020).
6" CAST -IN -PLACE CONCRETE
4 4 4 4 / CUSHION GEOTEXTILE
60-MIL HDPE
________________________________ ��PRIMARY GEOMEMBRANE
GEONET LEAK DETECTION SYSTEM
IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII
TYPICAL LEACHATE BASIN CROSS-SECTION ON BASE
NOT TO SCALE
- 60-MIL HDPE
SECONDARY GEOMEMBRANE
- GEOSYNTHETIC CLAY LINER
12" COMPACTED SOIL LINER
NATURAL SOIL OR STRUCTURAL FILL
(COMPACTED EMBANKMENT)
UO I I AI:C:t55 KAIVIF
II I
0 I I 0
II I I \
REV DATE APPD DESCRIPTION
w
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0 50 100 150
w 0
0 GRAPHIC SCALE (IN FEET)
{ \ \ 1
,l, I i \ ` vo
TITLE
0 �I ► I \ PERIMETER 1\ `, -' GROUNDWATER OVERLAY - LEACHATE
. BERM
0 0 II \ EL.647.75' `\j ,,-' = BASIN COMPACTED SOIL LINER SUBGRADE
Ln
II I I o \� �\ I I ,
\ I I � NSLF(3619-INDUS) AND SSLF(3620-INDUS)
ALLEN STEAM STATION
II _ GASTON COUNTY, NORTH CAROLINA
I r _ N.C. ENGINEERING LICENSE NO. FOR
w 0 / I - '' ISSUED FOR REVIEW
O I �' ?�.' ` ,' F-0342
SEAL
O II � I I \ �` � � � � � ' �' ''�''''- DUKE
SCALE: AS SHOWN DES: AMC
r , �'\
w II I I -NNW
` DWG TYPE:. DWG DFTR: AMC
_ JOB N0: 60603204 CHKD: JDM
0 O I I I \ `� 'r '' '' '' ' - ENERGY® 'DATE: t-1422 - ENGR : JDM
I \ I ` �I / �', FILENAME: GW OVERLAY 034 - LEACHATE POND BASE OF SOIL LINER GRADING PLANAFOD: JDM
0 / I I \ '
DWG SIZE DRAWING NO. REVISION
w W I I ' --'
/
O I i i r r / r i i/ / / ANSI D
—� / w / 22.0"x34.0"
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o
0
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1