NCS000546_Monitoring Report_20210813

/• DUKE
V ENERGY
August 12, 2021
NCDEQ, Mooresville Regional Office
Attn: DEMLR Stormwater Program
610 East Center Ave., Suite 301
Mooresville, N.C. 28115
Subject: Duke Energy Carolinas, LLC
NPDES Storm Water Discharge Monitoring Report for:
Allen Steam Station — NCS000546 — Gaston County
Allen Steam Station
253 Plant Allen Rd.
Belmont, NC 28012
704 829-2587
AUG 13182,
In accordance with Part III, E(2) of the above referenced NPDES Storm Water permit, the original and one
copy of the monthly monitoring reports are attached. The samples collected are required monthly due to
Tier Two or Tier Three Status. The period for sampling ended July 31, 2021. Samples were collected for the
period at outfalls SW007, SW009, SW010, SW016, and SW018 on July 8, 2021. The laboratory analysis
results were received on July 21, 2021. Duke Energy has performed the steps required by the Tier II and
Tier III for these outfalls. There were no samples collected at outfalls SW001, SW013-10, SW013-13 and
SW020 for the period, due to No Qualifying Flow condition.
There were samples collected at outfall SW008 on July 8, 2021 and the results are included in this DMR.
All values reported on the attached reports are dependent on the accuracy of approved analytical methods
used to measure parameters.
Please direct any correspondence or questions concerning the Allen Steam Station NPDES Storm Water
Program to Elizabeth Glenn [phone] or Randy Gantt [phone].
Yours truly, ; A/
--tom
Jeffrey D. Flariagan, General Manager III
Allen Steam Station
Duke Energy Carolinas, LLC
Attachments
bc: w/attachment Elizabeth Glenn
UPS Tracking: 1 Z X67 601 42 9422 9093

STORMWATER DISCHARGE OUTFALL (SDO)
MONITORING REPORT
Permit Number NCS000546
FACILITY NAME Allen Steam Station
PERSON COLLECTING SAMPLE(S) Steve Hamilton/Shelby Dyer - Cardmi
CERTIFIED LABORATORY(S) Duke Energy Carolinas, LC Lab # 248
Pace Analvtical Services Lab #329
Part A: Specific Monitoring Requirements
SAMPLES COLLECTED DURING CALENDAR YEAR: 2021
(This menttoring report shall be received by the Division no later than 30 days from
rCdatef 'e facility receives the sampling results from the laboratory.)
7 n
(� COUNTY Gaston
PHONE NO.( 704 ) 829-2587
rn
SIGNATURE OF PERMITTEE OR DESIGNEE
REQUIRED ON PAGE 3.
Outl'all
No.
Date
Sample
Collected
50050
00400
01077
01002
01022
01012
01027
Total
Flow (if app.)
Total
Rainfall
pH
Silver, Total (as
A)
Arsenic, Total
(as As)
Boron, Total
(as B)
Beryllium,
Total (as Be)
Cadmium,
Total (as Cd)
mo/dd/yr
MG
inches
m
m
m
mgfL
m
SW001
N/A
N/A
NO QUALIFYING FLOW FOR THE MONTH OF JULY 2021
SW007
7/8/21
N/A
0.31
8.3
1 <0.0003
0.00119
<0.05
<0.001
<U.001
SW008
7/8/21
N/A
0.31
8.1
<0.0003
<0.001
<0.05
<0.001
<0.001
SW009
7/8/21
N/A
0.31
8.4
<0.0003
0.00192
<0.05
<0.001
<0.001
SWO10
7/8/21
N/A
0.31
8.2
<0.0003
0.00327
<0.05
<0.001
<0.001
SW013-10
N/A
N/A
NO QUALIFYING FLOW FOR THE MONTH OF JULY 2021
SW013-13
N/A
N/A
NO UALIFYING FLOW FOR THE MONTH OF JULY 2021
SW016
7/8/21
N/A
0.31
8.2
<0.00U3
<0.001
<0.05
<0.001
<0.001
SW018
7/8/21
N/A
0.31
8.3
<0.0003
11001
1 <0.05
1 <0.001
<0.001
SW020
N/A
N/A
NO QUALIFYING FLOW FOR THE MONTH OF JULY 2021
Outfall
No.
Date
Sample
Collected
01034
01042
01067
01051
01097
01147
01059
01092
Chromium,
total (as Cr)
Copper,
Total
(as Cu)
Nickel, Total
(as Ni)
Lead, Total (as
Ph)
Antimony,
Total (as Sb)
Selenium, Total
(as Se)
Thallium,
(Total as TI)
Zinc, Total (as
Zn)
mo/dd/yr
mg/L
mg/L
mg1L
mg1L
m
mFJL
m
SW001
N/A
NO QUALIFYING FLOW FOR THE MONTH OF JULY 2021
SW007
7/8/21
<0.001
<0.002
<0.001
<0.001
<0.001
<0.001
<0.0002
0.122
SWO08
7/8/21
<0.001
0.00504
<0.001
<0.001
<0.001
0.00293
<0.0002
U.019
SW009
7/8/21
<0.001
0.00255
<0.001
<0.001
<0.001
0.0109
<0.0002
10.050
SWO10
7/8/21
<0.001
0.00823
0.00155
<0.001
<0.001
0.00649
<0.0002
10.032
SWO13-10
N/A
NO QUALIFYING FLOW FOR THE MONTH OF JULY 2021
SW013-13
N/A
NO QUALIFYING FLOW FOR THE MONTH OF JULY 2021
SW016
7/8/21
<0.001 1 <0.002 <0.001 I <0.001 <0.001 I <0.001 <0.0002 10.052
Permit Number NCS000546 Form SWU-247, last revised 61122015
Page 1 of 3

Outfall
No.
Date
Sample
Collected
01034
01042
01067
01051
01097
01147
01059
01092
Chromium,
total (as Cr)
Copper,
Total
(as Cu)
Nickel, Total
(as Ni)
Lead, Total (as
Pb)
Antimony,
Total (as Sb)
Selenium, Total
(as Se)
Thallium,
(Total as TI)
Zinc, Total (as
Zn)
mo/dd/yr
mg/L
mg/L
m
m
m
m
m
m
SWO18
7/8/21
<0.001
<0.002
<0.001
<0.001
<0.001
<0.001
1 <0.0002
<0.005
SW020
N/A
NO QUALIFYING
FLOW FOR THE MONTH OF
JULY 2021
Outfall
No.
Date
Sample
Collected
71900
C0530
00556
Mercury, Total,
Method 1631E
Solids, Total
Suspended —
Concentration
Oil & Grease
mo/dd/yr
ng/L
I mg/L
m
SWO01
N/A
NO QUALIFYING FLOW FOR THE MONTH
OF JULY 2021
SWO07
7/8/21
1.14
3.1
SWO08
7/8/21
2.10
<2.5
SWO09
7/8/21
1.06
6.9
SW010
7/8/21
2.76
1 <2.5
SWO13-10
N/A
NO QUALIFYING FLOW FOR THE MONTH
OF JULY 2021
SWO13-13
N/A
NO QUALIFYING FLOW FOR THE MONTH OF JULY 2021
SWO16
7/8/21
0.842
3.2
SWO18
7/8/21
2.35 Avg
146.9
1 <5.0
SW020
I N/A
NO QUALIFYING FLOW FOR THE MONTH OF JULY 2021
Avg — Average of primary and duplicate mercury samples for SW016 (2.13 ng/L and 2.56 ng/L = 2.35 ng/L.
Does this facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month? © yes (�) no
(if yes, complete Part B)
Part B: Vehicle Maintenance Activitv Monitoring Renuirements
Outfall
No.
Date
Sample
Collected
50050
00556
00530
00400
Total Flow
(if applicable)
Total
Rainfall
Oil & Grease
(if appl.)
Non -polar
O&G/TPH
(Method 1664
SGT-HEM), if
appl.
Total
Suspended
Solids
pH
New Motor
Oil Usage
mo/dd/yr
MG
inches
mg/l
mg/l
unit
gal/mo
Permit Number NCS000546 Form SWU-247, last revised 611212015
Page 2 of 3

STORM EVENT CHARACTERISTICS:
Date 7/8/21
Total Event Precipitation (inches): 0.31
Event Duration (hours): (only if applicable — see permit.)
(if more than one storm event was sampled)
Date
Total Event Precipitation (inches):
Event Duration (hours): (only il' applicable — see permit.)
Mail Original and one copy to:
Division of Energy Mineral and Land Resources
Attn: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
"I 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. I am aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations."
(Signature of Permittee)
i
i
Permit Number NCS000546
F-//Zf'2o2
(Date)
Form SWU-247, Iasi revised 611212015
Page 3 of 3