3620_DukeAllen_PZ02_AbandonmentReq_FID1795493_20230516

Moutos, Sarah
From: Murphy, Courtney <[e-mail]>
Sent: Tuesday, May 16, 2023 1:13 PM
To: Moutos, Sarah
Cc: Russ, Jordan A; Osborn, Claire J
Subject: [External] Allen SSLF-PZ-02 Abandonment Request_3620-INDUS
Attachments: 2022_03_24_SSLF NCDEQ DWM Figure.pdf; SSLF-PZ-02 Draft Boring Log.pdf
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Sarah —
One of the water level monitoring piezometers within the footprint of the SSLF (3620-INDUS) needs to be abandoned
due to subgrade excavation progression in its vicinity. The piezometer is labeled SSLF-PZ-02 as shown in attached
figure. A typical well abandonment via grouting per 2C Well Construction Standards is planned for this week pending
your approval.
I attached a draft boring/well logs if interested in that information for this location (final boring logs for each of the
previously installed SSLF-PZ's will be included in the upcoming groundwater modeling tech memo companion document
to the PTC Mod Request).
We will likely replace this piezometer in the near future since it was the closest water level monitoring point to the
future SSLF sump, but I will send you a separate request for approval to install such once we have those details
determined.
Let me know if you have any questions or need additional information.
Respectfully,
Courtney Uk Murphy, PG
Lead Environmental Specialist
EHS Waste & Groundwater Programs
Courtnev.MurohvCcDduke-energv.com
Office: 704.382.7171
Mobile: [phone]

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LEGEND
C PLANNED PIEZOMETER
EXISTING MONITORING WELL
SOUTH STARTER LANDFILL BOUNDARY
ACTIVE ASH BASIN WASTE BOUNDARY
RETIRED ASH BASIN WASTE BOUNDARY
RETIRED ASH BASIN ASH LANDFILL WASTE
BOUNDARY
DORS FILLS BOUNDARIES
- DUKE ENERGY CAROLINAS PROPERTY LINE
STREAM (AMEC NRTR 2015)
WETLAND (AMEC NRTR 2015)
4T
r
NOTES:
1. PROPOSED PIEZOMETER LOCATIONS ARE DEEMED APPROXIMATE AND FINAL LOCATIONS
WILL BE DETERMINED DURING FIELD IMPLEMENTATION.
2. THE WATERS OF THE US HAVE NOT BEEN APPROVED BY THE US ARMY CORPS OF ENGINEERS
AT THE TIME OF THE MAP CREATION. THIS MAP IS A PRELIMINARY JURISDICTIONAL
DETERMINATION ONLY. THE WETLANDS AND STREAMS BOUNDARIES WERE OBTAINED FROM
AMEC FOSTER WHEELER ENVIRONMENTAL &AMP; INFRASTRUCTURE, INC. NATURAL
RESOURCE TECHNICAL REPORT FOR ALLEN STEAM STATION DATED MAY 29, 2015.
3. ALL BOUNDARIES ARE APPROXIMATE.
4. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
5. AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO ON DECEMBER 13, 2018.
AERIAL WAS COLLECTED ON MARCH 30, 2018.
6. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM FIPS 3200 (NAD83).
GRAPHIC SCALE
250 G500
FIGURE 1
(IN FEET) SOUTH STARTER LANDFILL (3620-INDUS)
DRAWN BY: B. MCGANN DATE: 09/28/2020 PLANNED PIEZOMETERS
REVISED BY: B. MCGANN DATE: 03/24/2022 ALLEN STEAM STATION
CHECKED BY: L. DRAGO DATE: 03/24/2022
APPROVED BY: L. DRAGO DATE: 03/24/2022 GASTON COUNTY, NORTH CAROLINA
PROJECT MANAGER: C. SUTTELL

PROJECT: Allen Steam Station
WELL / BORING NO: SSLF-PZ-02
PROJECT NO: 1026.17
STARTED: 5/18/22 COMPLETED: 5/18/22
DRILLING COMPANY: Geologic Exploration
NORTHING: 523991.93 EASTING: 1400031.62
DRILLING METHOD: Hollow Stem Augers
G.S. ELEV: 616.87 ft M.P. ELEV: 619.74 ft
BOREHOLE DIAMETER: 8 IN
DEPTH TO WATER: 10 ft TOC TOTAL DEPTH: 28.0 ft BGS
NOTES: bgs: below ground surface
LOGGED BY: G. Khang CHECKED BY: M. Crai
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DESCRIPTION
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CONSTRUCTION
CLAY; red, dry, fine
e°-AquaGuard Grout (0-5 ft
bgs)
CLAY w/ minor silt and sand; dry to slightly moist, weak
5
plasticity, slightly cohesive
Brown and red at 5 ft bgs, brown w/ depth and clumpy
cuttings
-2-in PVC Riser
-Bentonite Holeplug Seal
Slightly micaceous
(5-10 ft bgs)
10
Driller noted water during drilling at —10 ft bgs
Light brown and slightly orange cuttings; decreased
40
cohesiveness and plasticity
15
`= f -Sand Filter Pack (10-28 ft
20
Light orange brown to light orange
bgs)
Minor rock pieces and gravel in cutting
-Well Screen (13-28 ft bgs
Increased moisture
25
Borin inated at 2 gs
30
35
40
45
CLIENT: Duke Energy Carolinas
SynTerra
148 River Street, Suite 220 PROJECT LOCATION: Gaston County, North Carolina
Terra Greenville, South Carolina 29601
s)mPhone:864-421-9999 PAGE 1 OF 1