1812_DukeMarshall_Phase3PiezometerAbandonmentRequest_FID1822035_20231129

(' DUKE
ENERGY-.
November 29, 2023
North Carolina Department of Environmental Quality
Division of Waste Management
Solid Waste Section
2090 U.S. Highway 70
Swannanoa, NC 28778
Attn: Ms. Sarah Moutos (submitted electronically)
Re: Request for Approval to Abandon Piezometers
Industrial Landfill No.1 - Phase 3
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 DEP-36A
Charlotte, NC 28201-1006
To progress site closure activities and future landfill construction, Duke Energy requests approval to abandon
Industrial Landfill No.1 (1812-INDUS; ILF) Phase 3 piezometer CLF-301 and CLF22-305, located within the
footprint of Phase 3. The attached Site Vicinity Plan (Figure 1) has the piezometers requested for abandonment
circled.
Both piezometers were installed to support the Geotechnical Investigation for ILF Phase 3.Piezometer CLF-
301 was installed in May 2021 and CLF22-305 was installed in March 2022, collectively 30 months
of groundwater elevation data have been collected from CLF-301 and 20 months from CLF22-305. The last
water level measurements were collected on November 8, 2023 and demonstrated substantial separation
between groundwater and compacted soil liner base grade (see Figure 2 attached).
Abandonment of the piezometers will be supervised by qualified geotechnical field support that is under the
direct supervision of and in contact with a Licensed Geologist. The piezometers will be abandoned by a North
Carolina licensed well contractor in accordance with subchapter 02C of the North Carolina Administrative
Code. Duke Energy will provide well abandonment logs to the Division upon completion of the field work.
If you need additional information regarding this request do not hesitate to email or call me at
Ashley.Healy(ab_duke-energy.com or [phone].
Respectfully submitted,
j4VAi
Ashley Healy, P.G.
Environmental Services
Attachments: Figure 1 Site Vicinity Plan (AECOM, February 2022)
Figure 2 Hydrographs (SynTerra, 2023)
cc (via e-mail): Claire Osborn, NCDEQ
Sherri Stanley, NCDEQ
Ed Mussler, NCDEQ
www.duke-energy.com Page 1 of 2

Scott Saunders, Duke Energy
Chris Varner, Duke Energy
Tyler Hardin, Duke Energy
Kim Witt, Duke Energy
Ed Sullivan, Duke Energy
www.duke-energy.com Page 2 of 2

2 3 4 5 6 7 8 FIGURE 1 REV. 0
LEGEND
--830-- EXISTING MAJOR TOPOGRAPHIC CONTOUR
EXISTING MINOR TOPOGRAPHIC CONTOUR
7.711
ASH BASIN WASTE BOUNDARY (APPROXIMATE)
_ _ - - M-ss--� __--_______--_-_-_-_ __ -_ _ \ - - - - EXISTING SITE FEATURE (APPROXIMATE)
Mi56_,- -____ -� `_ __�� �_ � / (/" S&ME PIEZOMETER LOCATION
PROPOSED INDUSTRIAL LANDFILL (ILF) AND PHASE
__________ __ BOUNDARY (APPROXIMATE) _� � _____ �____________ _--�--___ \M-62;`:. :\ - `` _: _" `\ ❑ S&ME VANE SHEAR TEST LOCATION
\ ' i0 GWA-85/D PROPERTY BOUNDARY
N, ;
- ))iil11/lIrl flr'�lll�r i,l ''/l` 1 1°` ��i'/ �'' I 1` \ `+ EXISTING PIEZOMETER LOCATION Q S&ME CONE PENETRATION TEST LOCATION
•oa - `1`�;i l _ �.a yam.,}, i;. /f`\111 %.1'` `i i ii/I r/I////// / . \ ; ` _ \ - , 1 I 1 / - --�-
,� Y 0 PROPOSED PIEZOMETER LOCATION (2022) DUKE ENERGY BORING LOCATION
ri/ / / -'�%l_ \\\ \ �\`�\`\ ` \\� �\\\ �`�/!% "'�.. 4 •_� ---, �_-,� -`-_-__ A INDUSTRIAL LANDFILL i1iIt
ABANDONED PIEZOMETER LOCATION
PERMIT NO. 1812� , SOIL BORING LOCATION (SYNTERRA
y♦W23 1 it,i 11 /g,\\\\\t -�`` _
' \ illli' lil!i/'If�l/illl ri ( \ ` \\\I\\\\\ 1�; �_��I i / i / l ( \
ILF I 11, 1u/ \ , \ \ \ \\ \I COMPREHENSIVE SITE ASSESSMENT)
I ' I ,1 `.`` _v-_-_ /. I J// l l l / /l / �' Y I 1 '. / / 1 ----------
PHASE
I_`_/////i//r
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$$ AECOM SOIL BORI
NG LOCATION (CLOSUR
E DESIGN ) ■
GROUNDWATER MONITORING WELL LO
CATION
DLF21-10 M-21\ (SYNTERRA COMPREHENSIVE SITE ASSESSMEN
T)
M-25 __________ --
-`-____=�AECOM SOIL BORING LOCATION (PHASE 2 SCOPE)
a --__ SURFACE WATER SAMPLE LOCATION (SYNTERRA
_--------------\`\\'o\1 AECOM PIEZOMETER LOCATION (PHASE 2 SCOPE) COMPREHENSIVE SITE ASSESSMENT)
\`_-_______ _
re �\ _--- -
`
'�7__ SHALLOW ZONE PIEZOMETER LOCATION
AECOM CONE PENETRATION TEST LOCATION • (SYNTERRA COMPREHENSIVE SITE ASSESSMENT) �MWdD (CLOSURE DESIGN AND PHASE 2 SCOPE)
-LF21-1M-34 MW-0 JCLFif HDR SOIL BORING/GROUNDWATER MONITORING O ABANDONED PIEZOMETER LOCATION SYNTERRA
,_-_' / COMPREHENSIVE SITE ASSESSMENT)
'1 WELL LOCATION
CLF211
CLF20-02CLF21-11 1
I C76-0r__ILF PHASE 2 M39
1r1/1 I111 l 1 „ (J, t-\\_ I I 1 I II11 `. / i%/ ABANDONED WELL LOCATION (SYNTERRA
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M-54 AB-17S/D ILF-1S/DIBR CELL 6
B S&ME BORING LOCATION (2004)
-20 t \CLF21
B
ASH PORE WATER MONITORING WELL LOCATION
M-08 i i l '. ' I 0 \ i 1 I / , / %: is `` r / I i `- ;-'i 1 I t\ _ l fri' i / \` •
x\ \\S - ,I/„11_„l I 1 \ I III II `' M-64'if �/ 1`\`. \\���--/ 1 , 1 \ , o //lr1 ,,I i �', (SYNTERRA COMPREHENSIVE SITE ASSESSMENT)
`�} IIi�r/�i
\ i I 1 t �(`�"-' _� , I /'/,.'% %%�' / I r %/ + `' --`- l ` \ `` - - ' ' r i : i , i S&ME BORING LOCATION (2009)
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j I lrit I J M-53 , I (b / ' / _
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I 1 , /� I / 1 I \ \ 9 \ / . \ / / / /
\ 1 CLF21 yr / U I( //, ' n l \ \�\ \ ` -- /� / j / (SYNTERRA COMPREHENSIVE SITE ASSESSMENT)
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■-s>_=ar' �i �,-'- iil, IS % //, MO IIIVN - /i / 1 \ WELL LOCATION 2008&2009
1,u // sa-10 ■ \ CLF21-131 IIII M-a n/, I \ ,I 1 �""" + \ \ LANDFILL \ I 1 \ PUMP TEST LOCATION SYNTERRA
, 11 , '■ i,� 11 , / /'l /) 1 (TO BE EXTENDED I 1, \ \' / / , \ \ \ \ S&ME CONE PENETRATION TEST/MONITORING WELL •
I % 1 ♦I - I11 ) J\ p VERTICALLY r 1 2\' PERMIT NO. ` COMPREHENSIVE SITE ASSESSMENT
_ I 0 LOCATION I aA IIIIIII `(J , I 11I I- 111`-,'`i�'`?p A/ CLF20-04 1 ) 1 ' ®\ \ ��\ -,`� 1 )
IIII, CLF21-13R IIlr1 I\I\/l ` j ; I 1 i CLF21-14\\`\ W +\ 1\\///
■I `, \ `, \ \ i` ,, `/ l�
\ I i I I I i / MAR-145 POND I IJ _) `_.i` ; �t `w-3IIIIII/, 1<_-----__',- �- IIII I \ \ m\ ) I/'`\`\\- / I I' ) I I 1M-03` --NOTES
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______
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N FIGURE 1
NN,\:PROPOSED PIEZOME
TER MAP
CSFW14 MARSHALLSTEAMSTATION"z'i/ 1 i
h CATAWBA COUNTY, NORTH CAROLINA
`----___-----'CCF FOR e-0 ISSUED FOR APPROVAL
/i-� _� iSCALE: AS SHOWN DES: RLP
/ AB-135/D �.`::`:`.y ; - _,. �( \ \ ` \ y " , DUKE
/ /',\`__�/ P-3 \ /r� ' \ r / / lI j DWG TYPE: .DWG DFTR: RLP
JOB N0: 60656120 CHKD: RPD
DATE: 02I25I2022 ENGfl: RPD
o 200 400 Boo
FILENAME: DEQ MARSHALL PROPOSED PIEZOMETERS_2022.DWG APPD: JAB
5 @ II ,\'Iil tt 1t \ �'''� J I +, \ //': \,-✓ \. ���\\ \ '� m GRAPHIC SCALE ( FEET)
o \ t „\\ , \ ` �,,i / `✓�' /� /�% \ / ' I l I 1 I i/%` DWG SIZE DRAWING NO. REVISION
IN ET ANSID FIGURE 1 0
,r / : �; 1 �' '
' II1'111\+1 r' /ice: --� 1 y� y
2 3 4 5 6 7 8

CLF-301
04U
tb
00 835
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c
0
825
N
W
> 820
v
J
a
++
815
810
6/1/2021 10/1/2021 2/1/2022 6/1/2022 10/1/2022 2/1/2023 6/1/2023
Date
CLF-301- Total water level change from transducer installation on 07/27/2021
to 09/26/2023 is -4.4 feet.
4
825
DD
00
820
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3
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};
815
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d
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r
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800
795
CLF22-305
���IAFII�I
��II'11111IIII�I�
6/1/2021 12/1/2021 6/1/2022 12/1/2022 6/1/2023
Date
CLF22-305 - Total water level change from transducer installation on
08/10/2021 to 09/26/2023 is -8.3 feet.
CLF22-305 water level dropped below the transducer as noted by
manual water level recordings starting 8/8/2023.
4
3
c
2
C
M
1
0
LEGEND
Notes:
DUKE
DRAWN BY: D. AVARD
DATE: 07/21/2021
FIGURE 2
—Cell 5construction start (05/31/2021)
NAVD88—North American
t, ENERGY
REVISED BY: D.AVARD
DATE:11/18/2023
HYDROGRAPHS— INDUSTRIAL LANDFILL NO1.
Future phases 3 through 5 CCR excavation start (06/18/2021)
Vertical Datum 1988
CHECKED BY: T. COLTON
DATE: 11/19/2023
— Cell 5 Blanket Underdrain construction start (9/20/2021)
Ft -Feet
(1812-INDUS) PHASE 2 EXPANSION
Cell 5 Blanket Underdrain construction completion (10/22/2021)
in - inches
`�
APPROVED BY: T. COLTON
DATE: 11/19/2023
MARSHALL STEAM STATION
Shallow Groundwater Flow Zone Transducer Data
( )
PROJECT MANAGER: T. COLTON
♦
Manual Water Level Measurement
�m
TERRELL, NORTH CAROLINA
Daily Total Rainfall (inches)
"7"Terra
www.synterracorp.com