NCS000548_2021 DMR_20210715

; 4� DUKE
Ir ENERGY®
July 15, 2021
DUKE ENERGY CORPORATION
Marshall Steam Station
8320 East NC Highway 150
Terrell, NC 28682
NC Dept. of Environmental Quality
Attention: Central Files
Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Duke Energy Carolinas, LLC
NPDES Stormwater Discharge Monitoring Report for:
Marshall Steam Station - NCS000548 — Catawba County
Year 1 Period 2 monitoring
Dear Sir or Madam:
In accordance with Part E-2. of the above referenced NPDES Stormwater permit, the original and
one copy of the Stormwater Discharge Outfall (SDO) monitoring reports containing results of the
Tier II monthly sampling is attached.
Representative samples were collected from stormwater outfalls SW002, SW003, SW007,
SW008, SW011, SW012, SW022 and SW025 on June 7, 2021. The attached summary of
corresponding analytical results indicate that three outfalls are reported with targeted constituents
above corresponding permit benchmarks. These include the following:
• SWO02 (Mercury, 12.1 ng/L)
• SWO03 (total suspended solids, 130 mg/L; Copper, 0.0139 mg/L; and Mercury, 13.5 ng/L)
• SWO07 (Zinc, 0.151 mg/1)
In response to the benchmark exceedances, Tier 1 inspections were performed at these outfalls on
June 29, 2021. A Tier 1 status email notification was submitted to the agency on June 30, 2021,
Feasible corrective actions were identified in the Tier 1 reports and are currently in the process of
being implemented at the facility.
As directed to the agency, outfall SWO12A was abandoned in 2020 and the grade was adjusted to
allow for sheet flow of stormwater in this area. To date, outfall SW026 has not been constructed.
Please direct any correspondence or questions concerning the Marshall Steam Station NPDES
Stormwater Program to Scott La Sala (828-478-7820) or Don Safrit at [phone].
Sincerely,
Rick R. "Roper
General Manager III
Marshall Steam Station
attachment
www.duke-energy.com

cc w/attachment: James Moore, MRO
be w/attachment: Scott La Sala
Don Safrit
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UPS Tracking Number 1Z8955X40399668801 Raleigh Central Office
1Z8955X40399128411 James Moore, MRO
DUKE ENERGY CORPORATION
Marshall Steam Station
8320 East NC Highway 150
Terrell, NC 28682
www.duke-energy.com

Permit Number NCS000548
FACILITY NAME
PERSON COLLECTING SAMPLE(S)
CERTIFIED LABORATORY(S)
Part A: Specific Monitoring Requirements
STORMWATER DISCHARGE OUTFALL (SDO)
MONITORING REPORT
Marshall Steam Station
J Scott La Sala
Duke Energy
Pace Huntersville Office
Shealy Environmental Services, Inc.
SAMPLES COLLECTED DURING CALENDAR YEAR: 2021
(This monitoring report shall be received by the Division no later than 30 days from the date the
facility receives the sampling results from the laboratory.)
Lab # 248
Lab # 530
Lab # 329
COUNTY
PHONE NO
Catawba
[phone]
SIGNATURE OF PERMITTEE OR DESIGNEE
REQUIRED ON PAGE 12338
Outfall
No.
Date
Sample
Collected
00400
01077
01002
01022
01012
01027
01034
01042
Total Rainfall
pH
Silver, Total (as
Ag)
Arsenic, Total (as
As)
Boron, Total (as
B)
Beryllium, Total
(as Be)
Cadmium, Total
(as Cd)
Chromium, Total
(as Cr)
Copper, Total (as
Cu)
mo/dd/ r
inches
unit
m /L
m /L
m /L
m /L
m /L
m /L
m /L
SW002
6/7/2021
0.59
7.2
<0.0003
0.00133
<0.05
<0.001
<0.001
0.00254
0.00323
SW003
6/7/2021
0.59
7.8
<0.0003
0.00376
<0.05
<0.001
<0.001
0.00775
0.0139
SW007
6/7/2021
0.59
7.2
<0.0003
<0.001
<0.05
<0.001
<0.001
<0.001
0.00648
SW008
6/7/2021
0.59
17.4
SWO11
6/7/2021
0.59
17.0
1
1
1
1
1<0.001
<0.001
SW012
6/7/2021
0.59
17.6
SW012A
---
outfall permanently abandonded
SW022
6/7/2021
0.59
17.4
SW025
6/7/2021
0.59
17.5
SW026
---
outfall not yet constructed
Outfall
No.
Date
Sample
Collected
01067
01051
01097
01147
01059
01092
71900
CO530
00556
Nickel, Total (as
Ni)
Lead, Total (as
Pb)
Antimony, Total
(as Sb)
Selenium, Total
(as Se)
Thallium, Total
(as Ti)
Zinc, Total (as Zn)
Mercury, Total
Method 1631 E
Solids, Total
Suspended -
Concentration
Oil & Grease
mo/dd/ r
m /L
m /L
m /L
m /L
m /L
m /L
n /L
m /L
m /L
SW002
6/7/2021
<0.001
0.00146
<0.001
<0.001
<0.0002
0.057
12.1
35
SW003
6/7/2021
0.00263
0.00625
<0.001
0.0022
0.000257
0.059
13.5
130
SW007
6/7/2021
<0.001
<0.001
<0.001
<0.001
<0.0002
0.151
5.20
8.9
<4.9
SW008
6/7/2021
1
1
1
7.9
SWO11
6/7/2021
<0.001
1
10.036
1
7.2
SW012
6/7/2021
19
SW012A
6/7/2021
outfall abandonded
SW022
6/7/2021
17.4
SW025
6/7/2021
139
SW026
6/7/2021
outfall not yet constructed
Benchmark exceedances include Zinc, Total (as Zn) at SW007
Benchmark exceedances include Solids, Total Suspended - Concentration and Copper, Total (as Cu) and Mercury, Total Method 1631 E at SW003
Benchmark exceedances include Mercury, Total Method 1631 E at SW002
Form SWU-247, last revised 4/1/2021
Permit Number NCS000548 Page 1 of 1

Does this facility pertorm Vehicle Maintenance Activities using more than 55 gallons of new motor oil per months yes
(it yes, complete Part B)
Part B: Vehicle Maintenance Activity Monitoring Requirements
STORM EVENT CHARACTERISTICS:
Mail Original and one copy to:
Date 06/07/2021 Division of Water Quality
Total Event Precipitation (inches): 0.59 Attm Central Files
Event Duration (hours): (only if applicable see permit.) 1617 Mail Service Center
Raleigh, North Carolina 77699 1617
(if more than one storm event was sampled)
Date
Total Event Precipitation (inches):
Event Duration (hours): (only if applicable— see permit.)
"1 certify, under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a system
designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who
manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief,
true, accurate, and complete. 1 am aware that there are significant penalties for submitting false information, including the possibility of fines and
imprisonment for knowing violations."
(iFoti R:dk
i Date)
no
Form SWU-247, last revised 4/1/2021
Permit Number NC5000549 Page 2 of 2

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