NCS000546_MONITORING REPORT_20201214

Allen Steam Station
DUKE
ENERGY
December 8, 2020
NCDEQ, Mooresville Regional Office
Attn: DEMLR Stormwater Program
610 East Center Ave., Suite 301
Mooresville, N.C. 28115
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Subject: Duke Energy Carolinas, LLC
NPDES Storm Water Discharge Monitoring Report for:
Allen Steam Station — NCS000546 — Gaston County
Duke Energy
253 Plant Allen Rd.
Belmont, NC 28012
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
November 30, 2020. Samples were collected for the period at outfalls SW007, SW009, SW010,
SW016, SW018 and SW020 on November 11, 2020. The laboratory analysis results were
received on November 24, 2020. Duke Energy has performed the steps required by the Tier II
and Tier III for these outfalls. There was no sample collected at outfalls SW001, SW013-10 and
SW013-13 for the period, due to No Qualifying Flow condition.
Outfalls SW008 and SW015 were sampled on November 11, 2020 and the analysis results are
included on this DMR.
Analytes sampled above the benchmark values for analytical monitoring are as follows.
Outfall
Parameter
Result
Benchmark
W007
Zinc
0.193 m /L
0.126 m /L
SW016
Copper
0.0153 m /L
0.010 m /L
SW016
TSS
140 m /L
100 m /L
W018
Copper
0.0128 m /L
0.010 m /L
W020
Copper
0.0149 m /L
0.010 m /L
SW020
I TSS 1
130 m /L
I 100 m /L
All values reported on the attached reports are dependent on the accuracy of approved
analytical methods used to measure parameters.

Allen Steam Station
DUKE
ENERGY,
Duke Energy
253 Plant Allen Rd.
Belmont, NC 28012
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,
Rick R. Roper, General Manager III
Allen Steam Station
Duke Energy Carolinas, LLC
Attachments
bc: w/attachment Elizabeth Glenn
UPS Tracking: 1Z X67 601 42 9720 9493

STORMWATER DISCHARGE OUTFALL (SDO)
MONITORING REPORT
Permit Number NCS000546
FACILITY NAME Allen Steam Station
PERSON COLLECTING SAMPLE(S) Dan Diffenbach/Steve Hamilton
CERTIFIED LABORATORY(S) Duke Enerev Carolinas, LC Lab # 248
Pace Analytical Services Lab #329
Part A: Specific Monitoring Requirements
SAMPLES COLLECTED DURING CALENDAR YEAR: 2020
(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.)
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SIGNATURE OF PERMITTEE OR DESIGNEE
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REQUIRED ON PAGE 3.
Outfall
Date
50050
00400
101002
101622
Inifivy
01027
No.
Sample
Total
Total pH Silver, Total (as I Arsenic, Total Boron, Total Beryllium, Cadmium,
Collected
Flow (if app.)
Rainfall A) (as As) (as B) Total (as Be) Total (as Cd)
mo/dd/yr
MG
inches
SW001
N/A
N/A
m m m m m
NO UALIFYING FLOW FOR THE MONTH OF NOVEMBER 2020
SW007
11/11/20
N/A
0.46
8.3
<0.0002
0.00155
<0.05
<0.001
<0.001
SWOUS
11/11/20
N/A
0.46
8.5
<U.0002
<0.001
<0.05
<0.001
<0.001
SWO09
11/11/20
N/A
0.46
7.9
<O.0002
0.00142
<U.OS
<0.001
<0.001
SW010
11/11/20
N/A
0.46
8.1
<O.O002
0.00218
<U.05
<0.001
<0.001
SW013-10
N/A
N/A
NO QUALIFYING
FLOW FOR
THE MONTH OF
NOVEMBER
2020
SWO13-13
N/A
I N/A
NO QUALIFYING FLOW FOR THE MONTH OF NOVEMBER 2020
SWO15
11/11/20
N/A
0.46
7.5
<0.0002
0.00329
0.407
<0.001
<0.001
SWO16
11/11/20
N/A
0.46
7.9
<0.0002
0.0115
<O.US
<0.001
<0.001
SWO18
11/11/20
N/A
0.46
7.6
<0.0002
<0.001
<0.05
<0.001
<UAUI
SW020
11/11/20
N/A
6. 66
7.9
<0.0002
0.00138
<U.OS
<0,001
<O.001
Outfall
Date
01034
01042
1 01067
101051
01097
101147
01059
U1092
No.
Sample
Chromium,
Copper,
Nickel, Total
Lead, Total (as
Antimony,
Selenium, Total
Thallium,
Z. Total (as
Collected
total (as Cr)
Total
(as Ni)
Ph)
Total (as Sb)
(as Se)
(Total as TI)
Zn)
(as Cu)
mo/dd/yr
I mg/L mg/L m L m m L m
SWU01
N/A
m m
NO QUALIFYING FLOW FOR THE MONTH OF NOVEMBER 2020
SWO07
11/11/20
O.00110
O.OU271
<0.U01
<0.UU1
<U.(in 1
<U.OUl
I <O.U002
0.193
SWO08
11/11/20
<0.001
0.00423
<0.001
I <0.001
<0.001
0.00167
<0.0002
0.011
SW009
11/11/20
<0.001
0.00198
<O.UU1
<U.0U1
<U.001 10.00610
<0.0002
0.076
SWO10
11/11/20
0.00210
O.0077U
0.00175
<O.OUl
<U.001 10.0108
<0.0002
0.022
SWO13-10
N/A
NO QUALIFYING
FLOW FOR
THE MONTH OF
NOVEMBER
2020
SWO13-13
N/A
NO QUALIFYING FLOW FOR THE MONTH OF NOVEMBER 2020
SWO15
11/11/20
<0.001 I 0.00181 10.00154 1 <0.001 <U.OUl < 1.001 <0.0002 0.028
Permit Number NCS000546 Form SWU-247, last revised 611212015
Page I ol'3

utfall
No.
Date
Sample
Collected
01034
01042
01067
01051
01097
01147
01059
01092
Chromium,
total (as Cr)
Copper,
Total
(as Cu)
Nickel, Total
(as NO
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
mg/L
mg/L
mg/L
mg/L
m
mg/L
SWO16
11/11/20
0.00876
0.0153
0.00764
0.00522
0.00126
0.00229
<0.0002
0.090
SWO18
11/11/20
<0.001
0.0128
<0.001
0.00198
<U.001
<0.001
<0.0002
0.090
SW020
11/11/20
0.00516
0.0149
0.00349
0.00356
<U.001
<0.001
<0.0002
0.048
Outfall
No.
Date
Sample
Collected
71900
C0530
00556
Mercury, Total,
Method 1631E
Solids, Total
Suspended -
Concentration
Oil & Grease
mo/dd/yr
ng/L
mg/L
mg/L
SWOOI
N/A
NO QUALIFYING FLOW FOR THE MONTH OF NOVEMBER
2020
SWO07
11/11/20
1.30
68
SWO08
11/11/20
1.77
<2.5
SW0t19
11/11/20
1.13
<2.5
SWOW
11/11/20
2.18
110
SWO13-10
N/A
NO QUALIFYING FLOW FOR THE MONTH OF NOVEMBER
2020
SWO13-13
N/A
NO QUALIFYING FLOW FOR THE MONTH OF NOVEMBER
2020
SWO15
11/11/20
1.46
<2.5
SWO16
11/11/20
20.2
140
SWO18
11/11/20
4.30 Avg.
13
<5.0
SW020
11/11/20
11.0 1130
Avg -Average of primary and duplicate mercury samples for SWO 18 (4.32 no and 4.28 ng/L = 4.30 ng/L).
Benchmark exceedances include Zinc at SWO07; Copper at SWO16, SWO18 and SW020; TSS at SWO16 and SW020.
Nate: The Hg result for outlall SWO16 was 20.2 no/L. This Ho value is above the 12 ng/L North Carolina water duality standard for mercury and is noted on this DMR but does not
trigger a 'Pier response.
Permit Number NCS000546
Form SWU-247, last revised 011212015
Page 2 of 3

Does this Facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month? 0 yes C:; no
(if yes, complete Part B)
Part B: Vehicle Maintenance Activitv Monitoring Reouirements
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/I
mg/I
unit
gal/mo
STORM EVENT CHARACTERISTICS:
Date 11/11/20
Total Event Precipitation (inches): 0.46
Event Duration (hours): (only it 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."
Z
(Dat
Permit Number NCS000546
Form SWU-247, lust revised 611212015
Page 3 of 3