NCS000546_Monitoring Report_20210908

DUKE
' ENERGY Allen Steam Station
253 Plant Allen Rd.
Belmont, NC 28012
704 829-2587
September 2, 2021
RECEIVE
NCDEQ, Mooresville Regional Office
Attn: DEMLR Stormwater Program Sp "8 7021
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
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 August 31, 2021. Samples were collected for
the period at ouffalls SW016 and SW018 on August 3, 2021. The laboratory analysis results were received
on August 17, 2021. Duke Energy has performed the steps required by the Tier II and Tier III for these
outfalls. There were no samples collected at ouffalls SW001, SW007, SW009, SW010, SW013-10, SW013-
13 and SW020 for the period, due to No Qualifying Flow condition.
There were samples collected at outfall SW015 on August 3, 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,
Jeffrey D. Flandgan, General Manager
Allen Steam Station
Duke Energy Carolinas, LLC
Attachments
bc: w/attachment Elizabeth Glenn
UPS Tracking: 1Z X67 601 42 9624 3000

STORMWATER DISCHARGE OUTFALL (SDO)
MONITORING REPORT
Permit Number NCS000546 SAMPLES, COLLECTED DURING CALENDAR YEAR: 2021
(Vs monitoring report shall be received by the Division no later than 30 days from
th-gdate the facility receives the sampling results from the laboratory.)
FACILITY NAME Allen Steam Station
PERSON COLLECTING SAMPLE(S) Joshua Sexton - Cardno o
CERTIFIED LABORATORY(S) Duke Energy Carolinas, LC Lab # 248 f (l
Pace Analytical Services Lab #329
Part A: Specific Monitoring Requirements
COUNTY Gaston
PHONE NO. 7( 04 ) 860-4945
SIGNATURE OF PERMITTEE OR DESIGNEE
REQUIRED ON PAGE 3.
Outfall
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
mglL
m
mgtL
m
m
SW001
N/A
N/A
NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021
SWO07
N/A
N/A
NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021
SW009
N/A
N/A
NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021
SWO10
N/A
I N/A
NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021
SW013-10
N/A
N/A
NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021
SW013-13
N/A
N/A
NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021
SWO15
813/21
N/A
0.16 17.5
1 <0.0003
1<0.001
10.751
<0.001
<0.001
SW016
8/3/21
N/A
0.16 18.1
1 <0.0003
1 <0.001
1 <0.05
<0.001
I <0.001
SW018
8/3/21
N/A
0.16 17.9
1 <0.0003
<0.001
1 <0.05
<0.001
<0.001
SW020
N/A
N/A
NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 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
m
mgfL
mglL
mglL
m gtL
SW001
N/A
NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021
SW007
N/A
NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021
SW009
N/A
I NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021
SW010
N/A
NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021
SW013-10
N/A
NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021
SW013-13
N/A
NO UALIFYING FLOW FOR THE MONTH OF AUGUST 2021
SW015
8/3/21
<0A01
<0.002
<0.001
I <0.001
<0.001
<0.001
<0.0002
<0.005
SWO16
8/3/21
<0.001
<0.002
1 <0.001
<0.001
<0.001
<0.001
1 <0.0002
10.013
Permit Number NCS000546
Form SWU-247, last revised 611212015
Page I 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
mqJL
m
m
m
m
SW018
8/3/21
<0.001
<0.002
<0.001
<0.001
<0.001
<0.001
<0.0002
<0.005
SW020
N/A
N/A
NO QUALIFYING
FLOW FOR THE MONTH OF
AUGUST 2021
Outfall
No.
Date
Sample
Collected
71900
CO530
00556
Mercury, Total,
Method 1631E
Solids, Total
Suspended —
Concentration
Oil & Grease
mo/dd/yr
ng/L
I mg/L
m
SW001
N/A
NO QUALIFYING FLOW
FOR THE MONTH
OF AUGUST 2021
SW007
N/A
NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021
SW009
N/A
NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021
SWO10
N/A
NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021
SW013-10
N/A
NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021
SW013-13
N/A
NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021
SW015
8/3/21
2.74
<2.5
SW016
8/3/21
0.555
<2.5
SW018
8/3/21
1.59 Avg
4.3
<5.0
SW020
N/A
NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021
Avg — Average of primary and duplicate mercury samples for SW018 (1.61 ng/L and 1.57 ng/L = 1.59 ng/L).
Does this facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month? O yes Q no
(if yes, complete Part B)
Part B: Vehicle Maintenance Activitv Monitoring Reauirements
Outfall
Date
50050
00556
00530
00400
No.
Sample
Total Flow
Total
Oil & Grease
Non -polar
Total
pH
New Motor
Collected
(if applicable)
Rainfall
(if appl.)
O&G/TPH
Suspended
Oil Usage
(Method 1664
Solids
SGT-HEM), if
appl.
mo/dd/yr
MG
inches
mg/l
mg/1
unit
gal/mo
Permit Number NCS000546 Form SWU-247, last revised 611212015
Page 2of3

STORM EVENT CHARACTERISTICS:
Date 8/3/21
Total Event Precipitation (inches): 0.16
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 if 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."
Permit Number NCS000546 Form SWU-247, last revised 611212015
Page 3 of 3