CCB0031_DukeMarshall_NorthSF_Notification_WellSOW-2A_Reloc_FID_20240228

Moutos, Sarah
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Healy, Ashley Lisbeth <[e-mail]>
Wednesday, February 28, 2024 3:44 PM
Moutos, Sarah
Russ, Jordan A; Stanley, Sherri; Saunders, Scott Allen; Varner, Chris; Zakary, Daniel T.;
Hardin, Tyler; Witt, Kimberlee
[External] Marshall - NCDEQ Notification for Structural Fill (CCB0031) N. Stability Feature
Dewatering Well Relocation
CCB0031_North Stability Feature -Phase I_SOW-2A Relocation -For Information Only_
02-28-2024.pdf
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Sarah - As discussed, this is a notification to NCDEQ Solid Waste that Duke Energy intends to replace and relocate one
shallow observation well (SOW-2) part of the Structural Fill north stability feature dewatering system. SOW-2 has
become dry, and therefore is not a viable observation location for monitoring the dewatering system operations during
the stability feature construction.
Replacement observation well SOW-2A will be located further within the Ash Basin finger. The well construction details,
including that the well will be screened in ash, will be similar to the shallow observation well details provided in the July
7, 2023 submittal (FID 1810470). The attached figure shows the approximate location for SOW-2A; SOW-2 will be
abandoned.
Please let me know if you have any questions with this notification.
Regards,
Ashley Healy
Ashley L. Healy, P.G.
Waste and Groundwater Programs
Mobile: [phone]

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C:\USERS\MEAGAN.SURANE\AECOM\DUKE ENERGY-MARSHALL - GENERAL (1)\MAR STABILITY FEATURES\900-CAD-GIS\910_CAD\25-FIGURES\O6_STRUCTURAL FILL NORTH PROPOSED CONDITIONS -PHASE III.DWG 2/7/2024 2:09:32 PM
101
0 50 100 150
GRAPHIC SCALE (IN FEET)
LEGEND - 800 - — EXISTING MAJOR TOPOGRAPHIC CONTOUR
KELLER DRILLED DEEP OBSERVATION WELL - EXISTING MINOR TOPOGRAPHIC CONTOUR
KELLER SHALLOW OBSERVATION WELL PROPOSED MAJOR TOPOGRAPHIC CONTOUR
CEC VIBRATING WIRE PIEZOMETER PROPOSED MINOR TOPOGRAPHIC CONTOUR
CEC INCLINOMETER � . ASH BASIN BOUNDARY (APPROXIMATE)
AECOM CONE PENETRATION TEST LOCATIONS """""".. EXISTING SITE FEATURE (APPROXIMATE)
(2022)
STABILITY FEATURE LIMITS
REFERENCES
1. SEE SHEET MAR_C907.015.002 FOR DRAWING REFERENCES.
NnTF.q
1. EXISTING TOPOGRAPHIC CONTOURS WITH STABILITY FEATURE LIMITS DEPICT LIMITS OF PREVIOUS
EXCAVATION PHASE. IT IS THE INTENT OF THESE DRAWINGS THAT EXCAVATION LIMITS FOR PREVIOUS
PHASE BE ACHIEVED PRIOR TO COMMENCEMENT OF EXCAVATION FOR SUBSEQUENT PHASE.
2. MAXIMUM CCR EXCAVATION SLOPE WITHIN THE LIMITS OF EACH EXCAVATION PHASE SHALL BE
11-HORIZONTAL TO 1-VERTICAL, EXCEPT WHERE SHOWN. EXCAVATION SLOPES IN NATURAL SOILS
OUTSIDE THE STABILITY FEATURES ARE LIMITED TO 3-HORIZONTAL TO 1-VERTICAL. FIELD FIT
EXCAVATION SLOPES TO TIE INTO ACTUAL BASE OF CCR GRADES AS NECESSARY.
3. MAINTAIN A MINIMUM OFFSET OF 25-FT FROM TRANSMISSION TOWERS AND POLES WITHIN THE
PROPOSED EXCAVATION AREAS. COORDINATE WITH DUKE ENERGY PRIOR TO EXCAVATION WITHIN
100-FT OF TRANSMISSION TOWERS.
4. CONTRACTOR SHALL MANAGE SURFACE WATER RUNOFF TO MINIMIZE PONDING AT THE TOE OF CCR
EXCAVATIONS.
ID Northing Easting Ground Surface Estimated Bottom of
Elevation (FT) Ash (FT)
SOW-2A 685135.14 1412125.8 824.6 799.4
1. GROUND SURFACE ELEVATION BASED ON PROPELLER TOPOGRAPHIC SURVEY
2. ESTIMATED BOTTOM OF ASH BASED ON PRE -DEVELOPMENT TOPOGRAPHIC DATA.
A=GOM
N.C. ENGINEERING LICENSE NO.
F-0342
PROPOSED PHASE III GRADING PLAN
MARSHALL STEAM STATION
PV STRUCTURAL FILL NORTH STABILITY FEATURE
CATAWBA COUNTY, NORTH CAROLINA
FOR ISSUED FOR CONSTRUCTION
� DUKE SCALE: AS SHOWN DES: MCS
DWG TYPE: ,DWG DFTR : RLP
JOB NO:
ENFI � DATE: 02//0120246 ENGR : RPD
FILENAME: SEE FILE TAG AT BOTTOM LEFT IAPPD: JAB I
DWG SIZE DRAWING NO. I REVISION
ANSI D
22.0"x34.0"
70
m
0 INCHES 1 2 3 TENTHS 10 20 30 1 1 1 I I I I
4 5 6 7 8 9 10