NCS000573_DMR_20210201

ij's DUKE
ENERGY® Belews Creek Steam Station
Duke Energy Carolinas
3194 Pine Hall Road
Walnut Creek,NC 27609
Certified Mail#7019 1640 000 1291 5919
NC Department of
January 25, 2021 Environmental Quaiit.
Received
Ms. Tamera Eplin F 321
DEMLR Land Quality Section Winston-Salem
450 West Hanes Mill Rd, Suite 300 Regional Office
Winston-Salem, North Carolina 27105
Subject: Duke Energy Carolinas, LLC
NPDES Permit No. NCS000573
Belews Creek Steam Station
Response to Stormwater DMR Submittal October 2020
Dear Ms. Eplin:
Duke Energy Carolinas, LLC received your letter dated December 11, 2020 requesting a
summary of analytical data for Belews Creek stormwater outfall 006 since the first benchmark
exceedance for copper and zinc, a summary of corrective actions taken, and a copy of all
documentation associated with the Tier status for this outfall.
Duplicate copies of all requested information is included in this submittal. Should you have
questions, please contact Ms. Lori Tollie at 336-854-4916 or [e-mail]. or
Ms. Brenda Johnson at 336-445-0634 or at [e-mail]
Yours truly,
Michael Lanning
General Manager Ill, Regulated Stations
FHOCC Belews Creek Steam Station

Below is a summary of corrective actions that have been taken since the first exceedance for Copper
and/or Zinc at SW Outfall#0006:
1. All storm drains flowing to SW006 were inspected for any foreign objects or debris that may be
causing exceedance.
2. Areas surrounding storm drains were cleaned and inserts placed inside to catch any debris.
3. Waddles were placed around storm drains and replaced as needed.
4. SW006 discharged piping has been repaired/replaced and clean stones placed at the discharge
point.
5. The area surrounding the SFC (Submerged Flight Conveyor) has been paved with concrete and
SFC are completely contained.
6. The parking lot, roadways and area around intake are all paved and only about 10% is gravel to
date.
7. Belt area that conveys gypsum is inspected monthly and cleaned as needed.
8. Inspections of storm drains are conducted by on site contractors quarterly or as requested by
BCSS environmental.

�•.DUKE
�C ENERGY
Location: Belews Creek Steam Station
SDO Narrative Description and BMP Summary Permit No.: NC5000573
Outfall ID SW006 t kr;`i
Discharge Structure 18" CMP ;`.7 ` '' I4 ,
Location Intake Canalterato' -1
Latitude - Longitude 36°16'46.72" N - `" .“ t
80°03'29.23"W �x +'
max ,: �:
Drainage Area 3.5 acres
Percent Impervious 54% ' t r.!` `�-
• ,,;
Permit Monitoring Table 2
Industrial Activities and Drainage Area 6 contains the Submerged Flight Conveyor equipment,
Description concrete bunker for material stack out, concrete approach apron, and
concrete truck turn around to the east of the bunker. Additionally, this
drainage area contains approximately 280 feet of paved roadways and
approximately 320 feet of railways.
Significant Conveyor Transport Limestone
Materials/Potential (Solid): Gypsum
Pollutants Inert Material: Clean metal and plastic
Bottom Ash (Dewatered Bottom Ash (slurry)
Solids):
Delivery Vehicles:
BMP Summary • Inspect all vehicles arriving on the plant site and ensure overall
integrity of the body or container.
• Control leakage or spillage from vehicles or containers and ensure
that proper protective measurement.
Inert Material
• Organize material to prevent struck-by accidents.
• Evaluate excess material and properly discard as necessary.
Conveyor Transport
• Covered conveyor area minimizes threat to impact stormwater.
• Operations perform daily walk downs to identify potential
stormwater pollutants.
• In the event that significant amounts of gypsum or limestone are
observed, an inquiry into cause of material loss and potential
solutions shall be considered.
Train Transport
• Inspect loading/unloading areas and clean-up fugitive material,
as needed.
• In the event that significant amounts of fugitive material are
observed, an inquiry into cause of material loss and potential
solutions shall be considered.
Bottom Ash
• Perform daily inspections of the bottom ash equipment to
ensure that all water is contained.
• Wash down concrete with truck traffic using hose into bunker
drain trenches.
Notes:
1. Outfall fact sheet provides documentation for permit sections for narrative description of potential
pollutants (Part II, Section A, 1.(b)) and BMP Summary (Part II, Section A, 2.(c))

Summary of 1Analytical Monitoring Data 2017-2020
Belews Creek Steam Station
NPDES Stormwater Permit No. NC000573
Stormwater
Outfall SW 006
Date
Sampled 6/13/2017 9/17/2017 10/23/2-17 1i7/2020 8/21/2020 9/17/2020 12/14/2020
Rainfall 0.27 1.06 1.54 1.72 1.17 1.79 1.15
pH 7.56 10.81 7.89 8.5 6.2 7.4 6.1
Silver <0.0003 0.00226 0.000521 <0.0002 <0.0002 <0.0002 <0.0002
Arsenic 0.00431 0.0129 0.00274 <0.001 0.00125 0.00107 <0.001
Boron 0.057 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05
Beryllium <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001
Cadmium <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001
Chromium 0.00839 0.273 0.00783 <0.001 <0.001 0.0024 0.00213
Copper 0.0131 0.0349 0.0122 0.00388 0.00566 0.00479 0.00304
Nickel 0.00933 0.021 0.00482 <0.001 <0.001 0.0018 0.00147
Lead 0.00141 0.00821 0.00171 <0.001 <0.001 <0.001 <0.001
Antimony <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001
Selenium 0.00416 0.00426 0.00217 0.0018 0.00289 0.00293 <0.001
Thallium <0.0002 0.000381 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002
Zinc 0.194 0.204 0.079 0.075 0.05 0.08 0.12
Mercury 25.2 ng/L 51 17.8 6.26 13.4 Avg 31.2 Avg 19.4 Avg
TSS 56 430 59 <2.5 2.6 22 46
Oil &Grease <4.4 <4.9 <4.5 <5.0 <5.0 <5.0 <5.0
PCB-1016 <0.4 <0.4 <0.4
PCB-1221 <0.4 <0.4 <0.4
PCB-1232 <0.4 <0.4 <0.4
PCB-1242 <0.4 <0.4 <0.4
PCB-1248 <0.4 <0.4 <0.4
PCB-1254 <0.4 <0.4 <0.4
PCB-1260 <0.4 <0.4 <0.4