NCS000548_MONITORING INFO_20191203

STORMWATER DIVISION CODING SHEET
NCS PERMITS
PERMIT NO.
�/L � l.� �� Co
DOC TYPE
❑FINAL PERMIT
V MONITORING REPORTS
❑ APPLICATION
❑ COMPLIANCE
❑ OTHER
DOC DATE
❑ Ju I � / `) U !)
YYYYMMDD

Tr&4, DUKE
ENERGY.
November 27, 2019
NC Dept. of Environmental Quality
Attention: Central Files
Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
DUKE ENERGY CORPORATION
Marshall Steam Station
8320 East NC Highway 150
Terrell, NC 28682
Pr-..,.."tT_
DEC 032019
t---,caw i'V/ L PtE3
QVIR 3r-CTI# j
Subject: Duke Energy Carolinas, LLC
NPDES Stormwater Discharge Monitoring Report for:
Marshall Steam Station - NCS000548 — Catawba County
Year 5 — Period 1 Monitoring Report
Dear Sir or Madam:
In accordance with Part III, E (2) of the above referenced NPDES Stormwater permit, the original
and one copy of the Stormwater Discharge Outfall (SDO) monitoring reports are attached and
contain the results of the Year 5 — Period 1 stormwater monitoring at Marshall Steam Station.
Representative Semi -Annual stormwater samples were collected from Outfails SW002, SW003,
SWO04, SW007, SW008, SW011, SW012, SW022 and SW025 on October 30, 2019. The
corresponding laboratory analytical report for the referenced sampling event was received on
November 15, 2019. A summary of anaiytes reported at concentrations above permit benchmarks
is provided below.
Permitted
Reportedgnalyte
Permit
Outfall
Concentration
Benchmark
or Value
SWO04
Copper
0.0101 mg/I
0.010 mg/I
SWO04
Mercury
37.5 ng/I
12 mg/I*
SW011
Zinc
165 ug/1
126 ug/I
Hg benchmark reflects 2B but does not trigger tier status
Tier inspection were completed at the site on November 25, 2019, for Outfalls 004 and 011
detections. Results of inspections and analytical data will be maintained in the Stormwater
Pollution Prevention Plan on site.
Please direct any correspondence or questions concerning the Marshall Steam Station NPDES
Stormwater Program to Robert Wylie at [phone].
Si rely,
Rick R. Roper
General Manager III
Marshall Steam Station
attachment

V
DUKE
ENERGY
be w/attachment: Scott La Sala
Robert Wylie
File: CCP EWS
UPS Tracking Number 1Z8955X40393873493
DUKE ENERGY CORPORATION
Marsha!! Steam Station
8320 East NC Highway 150
Terre!!, NC 28682
Raleigh Central Office

STORN-4WATER DISCHARGE OUTFALL (SDO)
RECEIVED
MONITORING REPORT
Permit Number NCS000548 DEC o s zais
CENTkAL F11 Ir
UVIR 5ECTlo,'\1
FACILITY NAME Marshall Steam Station
PERSON COLLECTING SAMPLES)Staff
CERTIFIED LABORATORY(S) Duke Energy of the Carolinas, LLC Lab #248
Shealy Environmental Services, NC Lab #329
Part A: Specific Monitoring Requirements
SAMPLES COLLECTED DURING CALENDAR YEAR: 2019
(This monitoring report shall he received by the Division no later than 30 days from
the date the facility receives the sampling results from the laboratory.)
Outfall
No.
Date
Sample
Collected
00400
C0530
Total
Rainfall
pH
Solids, Total
Suspended -
Concentration
mo/dd/yr
inches
mg/L
SW002
10/30/I9
0.93
7.7
19.3
Outfall
No.
Date
Sample
Collected
00400
C0530
Total
Rainfall
pH
Solids, Total
Suspended -
Concentration
mo/dd/vr
inches
m L
SW003
10/30/19
0.93
7.8
17
COUNTY Catawba
PHONE NO. [phone]
SIGNATURE OF PERMITTEE OR DESIGNEE
REED ON PAGE 5.
Outfall
No.
Date
Sample
Collected
00400
01077
01002
01012
01022
01027
01034
Total
Rainfall
pH
Silver, Total (as
Ag)
Arsenic,
Total (as As)
Beryllium,
Total (as Be)
Boron, Total
(as B)
Cadmium,
Total (as Cd)
Chromium,
Total (as Cr)
mo/dd/vr
inches
mg1L
m L
m
mgZL
mg1L
m L
SWO04
10/30/19
0.93 18.o
1
<0.0002
0.0181
<0.001
0.151
<0.001
0.00596
Outfall
No.
Date
Sample
Collected
01042
01067
01051
01097
01147
01059
01092
Copper, Total
(as Cu)
Nickel, Total
(as NO
Lead, Total
(as Ph)
Antimony,
Total (as Sb)
Selenium,
Total (as Se)
10.000312
Thallium,
Total (As Tl)
Zinc, Total (as
Zn)
mo/dd/vr
m L
m L
m L
m L
m L
m L
m L
SWO04
10/30/19
0.0101
0.00624
0.00492
0.00101
0.0121
0.037
Form SWU-247. lust remised 2122012
Pa,,c 1 of 5

STORIIWATER DISCHARGE OUTFALL (SDO)
MONITORING REPORT
Outfall
Date
71900
C0530
34671
39488
39492
39496
39500
39504
39508
No.
Sample
Collected
Mercury,
Total, Method
1631E
Solids, Total
Suspended-
Concentration
PCB-1016
(Arochlor
1016)
PCB-1221
(Arochlor
1221)
PCB-1232
(Arochlor
1232)
PCB-1242
(Arochlor
1242)
PCB-1248
(Arochlor
1248)
PCB-1254
(Arochlor
1254)
PCB-1260
(Arochlor
1260)
mo/dd/yr
n L
m L
L
L
S W O04
10/30/19
37.5
95
<0.40
<0.40
<0.40
<0.40
<0.40
<0.40
<0.40
Outfall
No.
Date
Sample
Collected
00400
01077
01002
01022
01012
01027
Total
Rainfall
pH
Silver, Total (as
Ag)
Arsenic,
Total (as As)
Boron, Total
(as B)
Beryllium,
Total (as Be)
Cadmium,
Total (as Cd)
mo/dd/ r
inches
m L
m
m L
m L
m
SWO07
10/30/19 10.93
7.3
<0.0002
<0.001
<0.05
<0.001
<0.001
Outfall
Date
01034
01042
01067
01051
01097
01147
01059
01092
No.
Sample
Collected
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/ r
mglL
m
mg1L
m L
m L
m L
m
m L
SW007
10/30/19
<0.001
0.00171
0.00205
<0.00I
<0.001
0.00117
<0.0002
0.062
Outfall
Date
71900
C0530
34671
39488
39492
39496
39500
39504
39508
00556
No.
Sample
Collected
Mercury,
Total, Method
1631E
Solids, Total
Suspended- i
Concentration 1
PCB-1016
(Arochlor
1016)
PCB-1221
(Arochlor
1221)
PCB-1232
(Arochlor
1232)
PCB-1242
(Arochlor
1242)
PCB-1248
(Arochlor
1248)
PCB-1254
(Arochlor
1254)
PCB-1260
(Arochlor
1260)
Oil &
Grease
mo/dd/ r
n
m L
m L
SWO07
10/30/19
2.21
3.8 1
<0.40
1 <0.40
<0.40
<0.40
<0.40
<0.40
<0.40
<5.3
Outfall
No.
Date
Sample
Collected
00400
C0530
Total
Rainfall
pH
Solids, Total
Suspended -
Concentration
mo/dd/yr
inches
mg/L
SW008 i
10/30/19
0.93
i 6.3
26
Form SWU-247, last revised 21212012
Pane 2 of 5

STORMWATER DISCHARGE OUTFALL (SDO)
MONITORING REPORT
Outfall
No.
Date
Sample
Collected
00400
CO530
01027
01034
01051
01092
Total
Rainfall
pH
Solids, Total
Suspended-
Concentration
Cadmium,
Total (as Cd)
Chromium,
Total (as Cr)
Lead, Total
(as Ph)
Zinc, Total
(as Zn)
mo/dd/ r
inches
m L
m L
m
m
m L
SWOII
10/30/19
0.93
7.0
31
<0.001
0.00151
0.00102
0.165
Outfall
No.
Date
Sample
Collected
00400
CO530
Total
Rainfall
pH
Solids, Total
Suspended -
Concentration
mo/dd/ yr
inches
I
m
SW012
10/30/19 10.93
7..0
32
Outfall
No.
Date
Sample
Collected
00400
CO530
Total
Rainfall
pH
Solids, Total
Suspended -
Concentration
mo/dd/ r
inches
m
S��'012A
NO FLOW I
---
--
--
Outfall
No.
Date
Sample
Collected
00400
CO530
Total
Rainfall
pH
Solids, Total
Suspended -
Concentration
mo/dd/ yr
inches
m L
SNY022
10/30/19
0.93
7.5
56
Outfall
Date
00400
01092
CO530
Total
pH
Zinc, Total (as
Solids, Total
No.
Sample
Collected
Rainfall
Zn)
Suspended -
Concentration
mo/dd/ r
inches
m L
m
SW024
NOT
CONST-
RUCTED
Form SWU-247. last revised 222012
Page 3 ol'5

STOR,MWATER DISCHARGE OUTFALL (SDO)
MONITORING REPORT
Outfall
No.
Date
Sample
Collected
00400
C0530
Total
Rainfall
pH
Solids, Total
Suspended -
Concentration
mo/dd/ r
inches
m L
SW025
10/30/19
0.93
6.0
13
Stormwater outfalls SWOdb, SW009 and SW023 were removed from the Permit NCS000548 by DEQ on June 20. 2019, as stormwater flows in these industrial usage areas have
been rerouted to the facility wastewater system. Stormwater outfalls SW024 and SW025 were added to the referenced permit on September 19. 2018 by DEQ; however, as of
October 2019, Outlall 024 remains unconstructed.
Samples were collected on October 30, 2019. from Stormwater outfalls SW002, SW003, SW004, SWO07, SWO08, SWO1 1, SW012, SW022 and SW025. NO FLOW conditions
were met for Stormwater outfall SW012A. Permit benchmarks were exceeded at SW004 for copper and mercury and at SW01 1 for zinc. SW007 was reported below benchmarks
for the first period following the continued Tier Il status. No other permit benchmarks were exceeded during this monitoring. period.
Form SWU-247. last revised 21212012
Page 4 of 5

STORMWATER DISCHARGE OUTFALL (SDO)
MONITORING REPORT
Does this facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month? _yes X no
(il'yes, complete Part B)
Part 13: Vehicle iaintenance Activity Monitoring Requirements
Outfa[l
Date
50050
00556
00530
00400
Total Flow
Total
Oil & Grease
Non -polar
Total
pH
New Motor
No.
Sample
Collected
(if applicable)
Rainfall
(if appl.)
O&G/TPH
Suspended
Oil Usage
(Method 1664
Solids
SGT-HEM), if
appl.
mo/dd/ r
MG
inches
m
m
unit
al/mo
STORM EVENT CHARACTERISTICS: Mail Original and one copy to:
Division of Water Quality
Date 10/30/2019 Attn: Central Files
Total Event Precipitation (inches): 0.93 1617 Mail Service Center
Event Duration (hours): (only if applicable — see permit.) Raleigh, North Carolina 27699-1617
(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. I am aware that there are significant penalties for submitting false information,
inchwigg the possib' t� of fines and imprisonment for knowing violations."
(Signature of Permittee)
_ 1 f ­2- - 2DI ?
(Date)
Form SWU-247, last revised 21712012
Pa-e 5 of 5