NC0065099_Site Plans/Maps_20211109

Wastewater Treatment System Closure Plan
Capital Power Southport, NC Facility
NPDES Permit No. NC0065099
Introduction:
CPI USA North Carolina, LLC - Southport (CPI) is authorized under the NPDES Permit No. NC0065099 to
discharge treated coal pile runoff, fuel pile runoff from wood and tire derived fuel (TDF), low volume
wastewater, cooling tower blowdown, and reverse osmosis filter reject water via Outfall 003 (combined
flows from internal outfalls 001, 002 and 004). Effective at midnight on March 31, 2021, the facility
ceased operations and CPI began the process of closing the facility. The facility closure is scheduled to
be completed during the third quarter of 2022.
The wastewater treatment system closure methodology outlined herein was developed based on the
requirements of NPDES Permit No. NC0065099. A summary of the permit requirements is provided
below.
NPDES Permit No. NC0065099, Part III Section D Facility Closure Requirements:
"The Permittee must notify the Division at least 90 days prior to the closure of any wastewater treatment
system covered by this permit. The Division may require specific measures during deactivation of the
system to prevent adverse impacts to water of the State. This permit cannot be seconded while any
activities requiring this permit continue at the permitted facility."
Closure Methodology:
The following closure steps will be completed for closure of CPI's wastewater treatment system.
1. Submit a Wastewater Treatment System (WWTS) Closure Plan to NCDEQ for review and
approval.
2. Officially notify NCDEQ at least 90 days prior to closure.
3. CPI and its contractors will eliminate all potential sources of wastewater from the areas that
drain to the wastewater basins that are delineated on the attached map. A summary of these
areas is presented below:
o Switch Yard
■ Owned/operated by Duke Energy -Progress and connected to the Oil Trap Pit.
■ Cut and cap the drain line from the Duke Power Switch Yard to the Oil Trap Pit.
o Rail Car Unloading
■ Confirm that no additional unloading events are scheduled.
o Wood Storage Area
■ Remove any residual wood.
o Coal Storage Pile
■ Remove any residual coal.
■ Backfill, rough -grade and seed, to minimize erosion caused by stormwater run-
off.
o Coal Stockout and Reclaim Conveyors
■ Remove any residual coal from the conveyor equipment.
o Active Coal Storage
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■ Remove any residual coal.
o Laydown Area
■ Confirm no potential pollutant sources exposed.
o Woodchip Pile
■ Remove any residual wood chips.
o Tire -Derived Fuel (TDF) Storage Area
■ Remove any residual TDF
o Oil Trap Pit
■ Remove oil from equipment in containment areas that discharge to the Oil Trap
Pit.
■ Remove any residual solids and oily wastewater from the Oil Trap Pit.
4. Clean the v-ditches leading to the WWTS.
5. Remove or cap pipelines leading to the WWTS.
6. Clean the WWTS basins.
o Remove residual solids and clean the basins.
7. Perform a visual inspection of the cleaned basins for significant cracks. If significant cracks are
found, investigate potential impact to soil in the area of the crack(s).
8. Disconnect the discharge pipe between the WWTS and Outfall 003 discharge point.
9. Notify NCDEQ of closure status and offer opportunity for site visit and confirmation inspection.
10. Break up the basins, backfill, and grade the site.
11. Notify NCDEQ of completion of the closure work, and request that the NPDES permit be
rescinded.
12. Prepare a written report documenting the closure work for record keeping purposes to include
photographs and a log of closure work.
13. Receive NPDES permit recission letter from NCDEQ.
Page 2 of 2

No
Industrial
Activity
No
Industrial
Activity
No
Industrial
Activity
R,❑,
Bldg
SK
Pump'
House
❑UTFALL
006
Demineralizer
Bldg
Water
Tank
No
Industrial
Activity
Transformer
Yards
No
Industrial
Activity
Sand
Flit-r
Turb ne
Build ng
Boller
Building
No
Industrial
Activity
OUTFALL
J 001
A
0
TDF
Storage
Area
Warehouse/
Maint Bldg
sK
Coal
Storage
Area
Storage
Area
Truck
Dumper 1
No
Industrial
Activity
125
V—Ditch
250 FT
Active
Coal
Pile
Truck
Dum•= 2
No
Industrial
Activity
W W
Treatment ❑UTFALL
Bldg 005
Wastewater
Basin
RR Car
Unloading
Area
No
Industrial
Activity
❑UTFALL
002
OUTFA L
01C
48' RCP
UNDER RR
TRACK
TO DUKE
ENERGY
DISCHARGE
CANAL
LEGEND:
1) Oil Trap Pit (12,160-gal capacity)
2) Diesel Fuel AST (265-gal)
3) Unloading Bay; Gasoline (30-gal) & Drum
Storage area
4) Neutralization Tank
5) Condensate Tank
6) Ash Silo
7) Limestone Silo
8) Trash Dumpsters
9) Miscellaneous Materials
10) E,F,P Transformer (125-gal)
11) Two Diesel Fuel AST (1000-gal & 265-gal)
12) Wood, Ash, & Soil Piles
13) Indoor Chemical Storage
(Caustics & Flocculants)
14) Railroad Tie Crane/Chippers (200-gal) - By Others
15) Truck Dumper Hydraulic Oil Reservoirs (700-gal
& 320-gal)
16) Chipper Transformer (662-gal) - By others
17) Turbine Bldg,
- Lubrication system & Reservoirs (2 x 2000
gal)
- EHC Controllers (2 x 80-gal)
18) Step-up Transformers (2 x 9750-gal)
Auxiliary Transformers (2 x 1090-gal)
19) Power transformers (2 x 77-gal)
20) Oil Storage Room (55-gal drums) (12 x 60-gal)
(1 x 150-gal)
21) Chipper Diesel Fuel AST (1750-gal) - By Others
Underground Pipe/Structure
Gravel Surface
Drainage Area Boundary
IIIIIIIIIIIIIIII}IIII Railroad Tracks
Belt Conveyor
Fenceline
® Storm Drain
❑utf all Pipe
Overland Flow
SK Spill Response Supplies
r
•
FIGURE 2: BULK "OIL" FACILITIES & SITE DRAINAGE MAP
CPI - USA North Carolina
1281 Powerhouse Drive
Southport, Brunswick County, NC
LEAF ENVIRONMENTAL
& ENGINEERING, P.C.
1 426 E. NC HWY 54, STE C
DURHAM, NC 27713
PROJECT NO.: 257019
DATE: December, 2019
DRAWN BY: KJK
APPROVED BY: TWM
FILE: CPI/Southport/SPPP
SCALE: AS SHOWN