NCS000548_Discharge Monitoring Reports 2014-2018_20181208

STORMWATER DIVISION CODING SHEET
PERMIT NO. AfCSO OO J �
DOC TYPE -1 FINAL PERMIT
p44ONITORING INFO
-1 APPLICATION
Ll COMPLIANCE
OTHER
DOC DATE ❑ r� U I
YYYYM M DD

fDUKE DUKE ENERGY CORPORATION
enENERGYm Marshall Steam Station
8320 East NC Highway 150
Terrell, NC 28682
November 28, 2018
RECEIVE"D
NC Dept. of Environmental Quality DEC 0 8 2018
Attention: Central Files CEN'FkAL FILES
Division of Water Resources LWR SECTION fv"210
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 3 - Tier 11 Monthly Sampling Results
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 containing results of
the Tier II monthly sampling is attached. This submittal completes Month 3 Tier II sampling for
stormwater outfall SW007.
Representative samples were not collected from SWO07 on during October 2018 as a result to NO
FLOW conditions. Sampling was precluded as a result to stormwater events that initiated not
during daylight hours, did initiate on weekend days or inside 72 hour period since the last
stormwater event. Therefore, this report is submitted as a formal notification of the NO FLOW
conditions at the site for October 2018.
A Tier II stormwater management inspection was completed for stormwater systems SWO07 on
July 12, 2018, following receipt of Year 3 Period 2 analytical results. Current BMPs are being
improved to reduce potential sources of identified contaminants in stormwater. Results of
inspections and analytical data are maintained in the Stormwater Pollution Prevention Plan on
site.
Semi-Annual stormwater sampling was completed at Marshall Steam Station on November 12,
2018, and the corresponding laboratory analytical report is under preparation. A summary of
analyses, including results for Outfall 007, will be submitted to the agency within 14 days of
receipt by Marshall Steam Station.
Please direct any correspondence or questions concerning the Marshall Steam Station NPDES
Stormwater Program to Brad Loveland at [phone].
Si cerely,
'_�)a � 4AA----
Rick R. Roper
General Manager III
Marshall Steam Station
attachment
www.duke-energy.com

DUKE ENERGY CORPORATION
Marshall Steam Station
8320 East NC Highway 150
Terrell,NC 28682
be w/attachment: Scott La Sala
Brad Loveland
Tina Woodward
File: CCP EHS
UPS Tracking Number IZ8955X40396300408 Raleigh Central Office
www.duke-energy.com

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Permit Number NCS000548 SAMPLES COLLECTED DURING CALENDAR YEAR: 2016
(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.)
FACILITY NAME Marshall Steam Station COUNTY Catawba
PERSON COLLECTING SAMPLE(S)Staff PHONE NO.[phone]
CERTIFIED LABORATORY(S)Duke Energy of the Carolinas,LLC Lab#248
SIGNATURE OF PERMITTEE OR DESIGNEE
REQUIRED ON PAGE 2.
Part A:Specific Monitoring Requirements
Outfall Date 0E1400 CO530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
moldd/ r inches m911
SWO12 NO FLOW I --- --- ---
Samples were not collected from stormwater outfall SW007 during August 2018 as a result to NO FLOW conditions.
Form SWU-247,last revised 2212012
Page 1 or 2

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Does this facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor ail per month?_yes X no
(if yes,complete Part B)
Part B: Vehicle Maintenance Ac vity Monitoring Re uirements
Outfall Date 50050 00556 00530 00400
No. Sample Total Flow Total Oil &Grease Non-polar Total 141 New Motor
Collected (if applicable) Rainfall (if appl.) O&G/TPH Suspended Oil Usage
(Method 1664 Solids
SGT-HEM),if
appl.
mo/dd/ r MG inches Ing/I mg/l knit -,a1/mo
STORM EVENT CHARACTERISTICS: Mail Original and one copy to:
Division of Water Quality
Date NO FLOW Attn: Central Files
Total Event Precipitation(inches): NA 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.)
"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."
4Lt � �a� IV,?W
(Signature of Permittee) (Date)
Form SWU-247,lust revised 21212012
Page 2 of 2

r� DUKE DUKE ENERGY CORPORATION
ENERGY. Marshall Steam Station
8320 East NC Highway 150
Terrell,NC 28682
October 12, 2018
NC Dept. of Environmental Quality
Attention: Central Files N,� .- ��r.-F' fr
Division of Water Resources
1617 Mail Service Center OCI . 5 2W
Raleigh, NC 27699-1617
'17-N"I`RA� FILE$
Subject: Duke Energy Carolinas, LLC : . ? Z SECTION
NPDES Stormwater Discharge Monitoring Report for:
Marshall Steam Station - NCS000548 - Catawba County
Year 3 - Tier II Monthly Sampling Results
Dear Sir or Madam:
In accordance with Part ill, E(2) of the above referenced NPDES Stormwater permit, the original
and one copy of the Stormwater Discharge Outfail (SDO) monitoring reports containing results of
the Tier It monthly sampling is attached. This submittal completes Month 1 Tier II sampling for
stormwater outfall SW007.
Representative samples were not collected from SWO07 on during September 2018 as a result to
NO FLOW conditions. Sampling was precluded by stormwater events that initiated not during
daylight hours, did initiate on weekend days or inside 72 hour period since the last stormwater
event. Therefore, this report is submitted as a formal notification of the NO FLOW conditions at
the site for September 2018.
A Tier II stormwater management inspection was completed for stormwater systems SWO07 on
July 12, 2018, following receipt of Year 3 Period 2 analytical results. Current BMPs are being
improved to reduce potential sources of identified contaminants in stormwater. Results of
inspections and analytical data are maintained in the Stormwater Pollution Prevention Plan on
site.
Please .direct any correspondence or questions concerning the Marshall Steam Station NPDES
Stormwater Program to Brad Loveland at [phone].
S' erel ,
-CL�
Rick R. Roper
General Manager [I]
Marshall Steam Station
attachment
www.duke-energy.com

DUKE ENERGY CORPORATION
Marshall Steam Station
8320 East NC Highway 150
Terrell,NC 28682
be w/attachment: Scott La Sala
Brad Loveland
Tina Woodward
File: CCP EHS
UPS Tracking Number 1Z8955X40395535158 Raleigh Central Office
www.duke-energy.com

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Permit Number NCS000548 SAMPLES COLLECTED DURING CALENDAR YEAR: 2016
(This monitoring report shall be received by the Division no later than 31)days from
the date the facility receives the sampling results from the laboratory.)
FACILITY NAME Marshall Steam Station COUNTY Catawba
PERSON COLLECTING SAMPLI (S)Staff PHONE NO.[phone]
CERTIFIED LABORATORY(S)Duke Enerey of the Carolinas,LLC Lab#248
SIGNATURE OF PERMITTEE OR DESIGNEE
REQUIRED ON PAGE 2.
Part A.Specific Monitoring Requirements
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
SWO12 NO FLOW
Samples were not collected from stormwater outfall SWO07 during August 2018 as a result to NO FLOW conditions.
Form SWU-247, last revised 21212012
Page 1 of 2

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
(if yes,complete Part B)
Part B: Vehicle Maintenance Activity Monitoring Requirements
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&GITPH Suspended Oil Usage
(Method 1664 Solids
SGT-HEM),if
appl.
moldd/Er MG inches m m unit gallmo
STORM EVENT CHARACTERISTICS: Mail Original and one copy to:
Division of Water Quality
Date NO FLOW Attn: Central Files
Total Event Precipitation(inches): NA 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 il'applicable—see permit.)
"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."
e2J rD 1V /6
(Signature of Pe mitt (Efate)
Form SWU-247,last revised 2/2/2012
Page 2 of 2

404)
DUKE DUKE ENERGY CORPORATION
ENERGY. Marshall Steam Station
5320 East NC Highway 150
Terrell, NC 28682
August 31, 2018
Et%-,-;F1,�
NC Dept. of Environmental Quality
Attention: Central Files SEP 0 j 2018
Division of Water Resources Crt�
1617 Mail Service Center
Raleigh, NC 27699-1 6 1 7 DW�.t
Subject: Duke Energy Carolinas, LLC
NPDES Stormwater Discharge Monitoring Report for:
Marshall Steam Station - NCS000548 — Catawba County
Year 3 - Tier II Monthly Sampling Results
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 containing results of
the Tier II monthly sampling is attached. This submittal completes Month 1 Tier II sampling for
stormwater outfall SW007.
Representative samples were not collected from SWO07 on during August 2018 as a result to NO
FLOW conditions. This report is submitted as a formal notification of the NO FLOW conditions at
the site for August 2018.
A Tier II stormwater management inspection was completed for stormwater systems SWO07 on
July 12, 2018, following receipt of Year 3 Period 2 analytical results. Current BMPs are being
improved to reduce potential sources of identified contaminants in stormwater. Results of
inspections and analytical data are maintained in the Stormwater Pollution Prevention Plan on
site.
Please direct any correspondence or questions concerning the Marshall Steam Station NPDES
Stormwater Program to Brad Loveland at [phone].
Sinc ��l�y,�
LI.C�
Rick R. Roper
General Manager III
Marshall Steam Station
altachment
www.duke-energy.com

DUKE ENERGY CORPORATION
Marshal!Steam Station
8320 East NC Highway 150
_ Terrell,NC 28682
be w/attachment: Scott La Sala
Brad Loveland
Tina Woodward
File: CCP EHS
UPS Tracking Number 1Z8955X40397749398 Raleigh Central Office
1
1
www.duke-energy.com

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Permit Number NCS000548 SAMPLES COLLECTED DURING CALENDAR YEAR: 2016
(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.)
FACILITY NAME Marshall Steam Station COUNTY Catawba
PERSON COLLECTING SAMPLE(S)Staff PHONE NO.[phone]
CERTIFIED LABORATORY(S)Duke Energy of the Carolinas,LLC Lab#248
SIGNATURE OF PERMITTEE OR DESIGNEE
Part A: Specific Monitoring Requirements REQUIRED ON PAGE 2.
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
molddl r inches m L
SWO12 NO FLOW ---
Samples were not collected from stormwater outfall SWO07 during August 2018 as a result to NO FLOW conditions.
Form SWU-247, last revised 21212012
Page 1 of 2

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
(if yeas,complete Part B)
Part B: Vehicle Maintenance Activity Monitoring Requirements
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 m unit gal/mo
STORM EVENT CHARACTERISTICS: Mail Original and one copy to:
Division of Water Quality
Date NO FLOW Attn: Central Files
Total Event Precipitation(inches):—NA 1617 Mail Service Center-
Event Duration(hours): (only if applicable—see permit.) Raleigh,North Carolina 2760 9-1617
(if more than one storm event was sampled)
Date
Total Event Precipitation(inches):
Event Duration(hours): (only if applicable—see permit.)
"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."
4A�
(Signature of Permittee) (Date)
Form SWU-247, last revised 21212012
Page 2 of 2

DUKE DUKE ENERGY CORPORATION
Marshall Steam Station
fen ENERGY
8320 East NC Highway 150
Terrell, NC 28682
July 9, 2018
NC Dept. of Environmental Quality R EC.EIIII E 0
Attention: Central Files
Division of Water Resources JUL 18 2018
1617 Mail Service Center CEN-1'RAL F-ILES
Raleigh, NC 27699-1617 DVJR SECTION
Subject: Duke Energy Carolinas, LLC
NPDES Stormwater Discharge Monitoring Report for:
Marshall Steam Station - NCS000548— Catawba County
Year 3 - Period 2 Final Results
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 containing results of
the Year 3 Period 1 sampling is attached.
Representative samples were collected from Outfalls SW002, SW003, SW006, SWO07, SW008,
SW009, SW012 and SW022 on June 25, 2018. Outfalls SW004, SW011, SW012A and SW023
are reported as NO FLOW for the period as a result to insufficient rain accumulation during a
single qualified event for this Period as observed at Marshall Steam Station. The corresponding
laboratory analytical report for the referenced sampling event was received on July 6, 2018. A
summary of analytes reported at concentrations above permit benchmarks is provided below.
Permitted Reported Permit
Outfall Analyte Concentration Benchmark
or Value
SWO07 Zinc 0.160 mg/1 0.126 mg/l
—SWO07 Copper 0.0153 mg/I 0.010 mg/l
—SWO07 Mercury 32.7 ng/I 12 ng/l
SW022 TDS 100 mg/I 610 mg/1
Pursuant to permit requirements, Tier stormwater management inspections will be completed for
the SWO07 and SW022 stormwater systems before July 23, 2018. 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 Brad Loveland at [phone].
Si rely
Z
Rick R. Roper
General Manager ill
Marshall Steam Station
www.duke-energy.com

DUKE ENERGY CORPORATION
Marshall Steam Station
8320 East NC Highway 150
Terrell,NC 28682
be w/attachment: Scott La Sala
Brad Loveland
Tina Woodward
File: CCP EHS
UPS Tracking Number 1Z8955X40390475688 Raleigh Central Office
www.duke-energy.com

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Permit Number NCS000548 SAMPLES COLLECTED DURING CALENDAR YEAR: 2017
(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.)
FACILITY NAME Marshall Steam Station COUNTY Catawba
PERSON COLLECTING SAMPLE(S)Staff PHONE NO. (8)0)777-9898
CERTIFIED LABORATORY(S)Duke Energy of the Carolinas,LLC Lab#248
Shealy Environmental Services.NC Lab#329
SIGNATURE OF PERMITTEE OR DESIGNEE
REQUIRED ON PAGE 4.
Part A. Specific Monitoring Requirements
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m L
FRepor,ted as Outfall 102 under wastewater permit NC0004987,per 1/24/17 agency
correspondence
Outfall Date 00400 C0530
No. Sample Total Put Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m L
SW002 06/25/18 10.17 7.2 129
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
SW003 06/25/18 0.17 17.3 66
Outfall Date
No. Sample Total
Collected Rainfall
mo/dd/ r inches
SWO04 ---- NO FLOW
Form SWU-247, last revised 21212012
Page 1 of 4

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Outfall Date 00400 CO530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/yr inches mg/L
SW006 06/25/18 10.17 17.9 167
Outfall Date 50050 00400 01077 01002 01022 01012 01027
Sample Total Total pH Silver,Total(as Arsenic, Boron,Total Beryllium, Cadmium,
No. Collected Flow(if app.) Rainfall Ag) Total(as As) (as B) Total(as Be) Total(as Cd)
mo/dd/ r MG inches m m mg/L mg/L m
SW007 6/25/18 1 NA 0.17 7.8 1<0.0003 10.00399 1 <0.5 1 <0.001 <0.001
Outfall Date 01034 01042 01067 01051 01097 01147 01059 01092
No. Sample Chromium, Copper,Total Nickel,Total Lead,Total Antimony, Selenium, Thallium, Zinc,Total(as
Collected Total(as Cr) (as Cu) (as Ni) (as Pb) Total(as Sb) Total(as Se) Total(As Tl) Zn)
mo/dd/ r m m mgtL m mg1L m mgtL m
SW007 6/25/18 0.0053 0.0153 0.00743 0.00458 <0.001 0.00292 0.000223 0.160
Outfall Date 71900 CO530 34671 39488 39492 39496 39500 39504 39508 00556
No. Sample Mercury, Solids,Total PCB-1016 PCB-1221 PCB-1232 PCB-1242 PCB-1248 PCB-1254 PCB-1260 Oil&
Collected Total,Method Suspended- (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor Grease
1631E Concentration 1016) 1221) 1232) 1242) 1248) 1254) 1260)
mo/dd/ r n m m
SW007 6/25/18 32.7 64 *NA *NA *NA *NA *NA *NA *NA <5.3
*NA-PCB containers broken between sampling and shipping;consequently,no analysis was available.
Outfall Date 00400 CO530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/yr inches mg/L
SW008 12/05/17 10.17 16.2 158
Form SWU-247,last revised 21212012
Page 2 of 4

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Outfall Date 00400 C0530 34671 39488 39492 39496 39500 39504 39508
No. Sample Total pH Solids,Total PCB- PCB- PCB- PCB- PCB-1248 PCB- PCB-
Collected Rainfall Suspended- 1016 1221 1232 1242 (Arochlor 1254 1260
Concentration (Arochlo (Arochlo (Arochlo (Arochlo 1248) (Arochlo (Arochlo
r 1016) r 1221) r 1232) r 1242) r 1254) r 1260)
mo/dd/ r I inches m
SW009 06/25/18 10.17 17.2 146 <0.40 1 <0.40 1 <0.40 1 <0.40 1 <0.40 1 <0.40 1 <0.40
Outfall Date
No. Sample
Collected
mo/dd/ r
SW011 NO FLOW
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ inches m
7.1 76SWO12 06 5/180.17
Outfall Date
No. Sample Total
Collected Rainfall
mo/dd/ r inches
SWO12A ----- NO FLOW
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
SW022 06/25/18 10.17 17.3 1610
Outfall Date
No. Sample Total
Collected Rainfall
mo/dd/ r inches
SW023 ------- NO FLOW
Form SWU-247,last revised 2212012
Page 3 of 4

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
No Permit Benchmarks were exceeded for Year 2 Period I sampling and reporting. Four Outfalls are reported as NO FLOW: SW004,SW011,SWO12A and SW023.
The following lab information is noted:Arsenic was detected in blank at a concentration greater than half the reporting limit but less than the reporting limit. Analyte
concentration in sample is valid and may be used for compliance purposes.
Does this facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month? yes X no
(if yes,complete Part B)
Part B: Vehicle Maintenance Activity Monitoring Requirements
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&GITPH Suspended Oil Usage
(Method 1664 Solids
SGT-HEM),if
a 1.
mo/ddl r MG inches MgA unit -al/mo
STORM EVENT CHARACTERISTICS: Mail Original and one copy to:
Division of Water Quality
Date 06/25/2018 Attn: Central Files
Total Event Precipitation(inches): 0V17 1617 Mail Service Center
Event Duration(hours): (only if applicable—see permit.) Raleigh, Forth Carolina 27699-1617
(ii'more than one storm event was sampled)
Date
Total Event Precipitation(inches):
Event Duration(hours): (only if applicable—see permit.)
"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
eao�
(Signature of Permitte (Date)
Form SWU-247, last revised 21212012
Page 4 of 4

DUKE DUKE ENERGY CORPORATION
ENERGY, Marshall Steam Station
8320 East NC Highway 150
Terrell, NC 28682
January 11, 2018
NC Dept. of Environmental Quality
Attention: Central Files
Division of Water Resources JAN 19 7-018
1617 Mail Service Center
Raleigh, NC 27699-1617 DWR SECT ION
Il~,',"MOTION PROCESSING UNIT
Subject: Duke Energy Carolinas, LLC
NPDES Stormwater Discharge Monitoring Report for:
Marshall Steam Station - NCS000548 — Catawba County
Year 3 - Period 1 Final Results
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 containing results of
the Year 3 Period 1 sampling is attached.
Representative samples were collected from Outfalls SWO02, SWO03, SWO06, SWO07, SW008,
SWO09, SWO12, SW 12A and SW022 on December 5, 2017. Outfalls SWO04, SWO11 and
SW023 are reported as NO FLOW for the period as a result to insufficient rain accumulation during
a single event for this Period as observed at Marshall Steam Station. The corresponding
laboratory analytical report for the referenced sampling event was received on December 18, 2017.
A summary of analytes reported at concentrations above permit benchmarks is provided below.
Permitted ReportedAnalyte Concentration Permit
Outfall Benchmark
or Value
SWO03 TSS 330 m /I 100 m /I
SWO06 TSS 440 m /I loom /I
SWO07 I Zinc 7 0.138 mg/I 0.126 mg/I
Pursuant to permit requirements, Tier 1 stormwater management inspections were completed for
the SWO03, SWO06, and SWO07 stormwater systems on January 4, 2018. Results of inspections
and analytical data are maintained in the Stormwater Pollution Prevention Plan on site.
Please direct any correspondence or questions concerning the Marshall Steam Station NPDES
Stormwater Program to Brad Loveland at [phone].
Sincerely,
Rick R. Roper
General Manager III
Marshall Steam Station
www.duke-energy.com

DUKE ENERGY CORPORATION
Marshall Steam Station
8320 East NC Highway 150
Terrell,NC 28682
be w/attachment: Scott La Sala
Brad Loveland
Tina Woodward
File: CCP EHS
UPS Tracking Number IZ8955X40395087295 Raleigh Central Office
www.duke-energy.com

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Permit Number NCS000548 SAMPLES COLLECTED DURING CALENDAR YEAR: 2017
(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.)
FACILITY NAME Marshall Steam Station COUNTY Catawba
PERSON COLLECTING SAMPLE(S)Staff PHONE NO.[phone]
CERTIFIED LABORATORY(S)Duke Energy of the Carolinas,LLC Lab#248
Shealy Environmental Services,NC Lab#329
SIGNATURE OF PERMITTEE OR DESIGNEE
Part A: Specific Monitoring Requirements REQUIRED ON PAGE 4.
Outfall Date 00400 CO530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
Reported as Outfall 102 under wastewater permit NC0004987,per 1/24/17 agency
correspondence
Outfall Date 00400 CO530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches In
SW002 12/05/17 0.34 7.6 52
Outfall Date 00400 CO530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m L
SW003 12/05/17 0.34 17.6 330
Outfall Date
No. Sample Total
Collected Rainfall
mo/dd/ r inches
SW004 ---- NO FLOW
Form SWU-247, last revised 21212012
Page 1 of 4

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Outfall Date 00400 CO530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/yr inches in
SWO06 12/05/17 10.34 17.6 1440
Outfall Date 50050 00400 01077 01002 01022 01012 01027
Sample Total Total pH Silver,Total(as Arsenic, Boron,Total Beryllium, Cadmium,
No. Collected Flow(if app.) Rainfall Ag) Total(as As) (as B) Total(as Be) Total(as Cd)
mo/dd/ r MG inches m in m m m
SW007 12/05/17 1 NA 10.34 7.4 <0.0003 0.00258 <0.05 <0.001 <0.001
Outfall Date 01034 01042 01067 01051 01097 01147 01059 01092
No. Sample Chromium, Copper,Total Nickel,Total Lead,Total Antimony, Selenium, Thallium, Zinc,Total(as
Collected Total(as Cr) (as Cu) (as Ni) (as Pb) Total(as Sb) Total(as Se) Total(As Tl) Zn)
mo/dd/ r mgtL ar m m m m m m
SW007 12/05/17 0.00582 0.00992 0.00611 0.00403 <0.001 0.00287 <0.0002 0.138
Outfall Date 71900 CO530 34671 39488 39492 39496 39500 39504 39508 00556
No. Sample Mercury, Solids,Total PCB-1016 PCB-1221 PCB-1232 PCB-1242 PCB-1248 PCB-1254 PCB-1260 Oil&
Collected Total,Method Suspended- (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor Grease
1631E Concentration 1016) 1221) 1232) 1242) 1248) 1254) 1260)
mo/dd/ r n m m
SW007 12/05/17 12.06 172 <0.40 <0.40 1<0.40 1<0.40 1<0.40 1<0.40 1 <0.40 1<5.6
Outfall Date 00400 CO530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/yr inches mg/L
SWO08 112/05/17 10.34 �8.2 162
Form SWU-247,last revised 22/2012
Page 2 o1'4

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Outfall Date 00400 CO530 34671 39488 39492 39496 39500 39504 39508
No. Sample Total pH Solids,Total PCB- PCB- PCB- PCB- PCB-1248 PCB- PCB-
Collected Rainfall Suspended- 1016 1221 1232 1242 (Arochlor 1254 1260
Concentration (Arochlo (Arochlo (Arochlo (Arochlo 1248) (Arochlo (Arochlo
r 1016) r 1221) r 1232) r 1242) r 1254) r 1260)
mo/dd/ r I inches m
SW009 12/05/17 10.34 16.9 126 <0.40 1 <0.40 1 <0.40 1 <0.40 1 <0.40 1 <0.40 1 <0.40
Outfall Date
No. Sample
Collected
mo/dd/ r
Swon NO FLOW
Outfall Date 00400 CO530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
SW012 12/05/17 0.07 7.1 31
Outfall Date 00400 CO530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
SW012A 12/05/17 0.07 17.2 161
Outfall Date 00400 CO530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
SW022 12/05/17 10.07 7.5 129
Outfall Date
No. Sample Total
Collected Rainfall
mo/dd/ r inches
SW023 ------ NO FLOW
Form SWU-247, last revised 21212012
Page 3 of 4

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
No Permit Benchmarks were exceeded for Year 2 Period 1 sampling and reporting. Four Outfalls are reported as NO FLOW: SW004,SW011,SW012A and SW023.
The following lab information is noted:Arsenic was detected in blank at a concentration greater than half the reporting limit but less than the reporting limit. Analyte:
concentration in sample is valid and may be used for compliance purposes.
Does this facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month? yes X no
(if yes,complete Part B)
Part B: Vehicle Maintenance Activity Monitoring Requirements
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 m Il m I unit l;al/mo
STORM EVENT CHARACTERISTICS: Mail Original and one copy to:
Division of Water Quality
Date 12/05/2017 Attn: Central Files
Total Event Precipitation(inches): 0.34_ 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.)
"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."
zz A e L,4� — o [ f2 [2
(Signature of Permittee) (Date)
Form SWU-247, last revised 21212012
Page 4 of 4

DUKE DUKE ENERG Y CORPORATION
ENERGY.. Marshall Steam Station
8320 East NC Highway 150
Terrell, NC 28582
July 25, 2017
NC Dept. of Environmental Quality
Attention: Central Files RECEIVED
Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617 CENTRAL FILES
DWR SECTION
Subject: Duke Energy Carolinas, LLC
NPDES Stormwater Discharge Monitoring Report for:
Marshall Steam Station - NCS000548 — Catawba County
Year 2 - Period 2 Final Results
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 containing results of
the Year 2 Period 2 sampling is attached.
Representative samples were collected from Outfalls SW002, SW003, SW006, SW007, SW008,
SW009, SW011, SW012, and SW022 on June 22, 2017. Outfalls SW004, SWO12A and SW023
are reported as NO FLOW for the period as a result to insufficient rain accumulation during a
single event for this Period as observed at Marshall Steam Station. The corresponding laboratory
analytical report for the referenced sampling event was received on July 7, 2017. A summary of
analytes reported at concentrations above permit benchmarks is provided below.
Permitted ReportedAnalyte Concentration Permit
Outfall or Value Benchmark
SW008 TSS 220 mg/I 100 mg/I
Pursuant to permit requirements, a Tier 1 stormwater management inspection was completed for
the SWO08 stormwater system within two weeks of receiving sample results. Results of
inspections and analytical data are maintained in the Stormwater Pollution Prevention Plan on
site.
Please direct any correspondence or questions concerning the Marshall Steam Station NPDES
Stormwater Program to Brad Loveland at [phone].
Since y,
Rick R. Roper
General Manager III
Marshall Steam Station
www.duke-energy.com

DUKE ENERGY CORPORATION
Marshall Steam Station
8320 East NC Highway 150
Terrell,NC 28682
be w/attachment: Scott La Sala
Brad Loveland
Tina Woodward
File: CCP EHS
UPS Tracking Number 1Z8955X40391558873 Raleigh Central Office
www.duke-energy.com

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Permit Number NCS000548 SAMPLES COLLECTED DURING CALENDAR YEAR: 2017
(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.)
FACILITY NAME Marshall Steam Station COUNTY Catawba
PERSON COLLECTING SAMPLE(S)Staff PHONE NO.[phone]
CERTIFIED LABORATORY(S)Duke Energy of the Carolinas,LLC Lab#248
Shealy Environmental Services.NC Lab#329
SIGNATURE OF PERMITTEE OR DESIGNEE
REQUIRED ON PAGE 4.
Part A: Specific Monitoring Requirements
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
Reported as Outfall 102 under wastewater permit NC0004987,per 1/24117 agency
correspondence
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r linches m
SWO02 06/22/17 10.07 17.46 <5
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
SWO03 06/22/17 0.07 7.94 40
Outf:ill Date
No. Sample Total
Collected Rainfall
mo/dd/ r inches
SW004 ---- NO FLOW
Form SWU-247, last revised 21212012
Page 1 of 4

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/yr inches mg/L
SW006 06/22/17 10.07 17.07 131
Outfall Date 50050 00400 01077 01002 01022 01012 01027
Sample Total Total pH Silver,Total(as Arsenic, Boron,Total Beryllium, Cadmium,
No. Collected Flow(if app.) Rainfall Ag) Total(as As) (as B) Total(as Be) Total(as Cd)
mo/dd/ r MG inches m m m m m
SWO07 06/22/17 1 NA 0.07 17.20 <0.0003 1 <0.001 <0.05 <0.001 <0.001
Outfall Date 01034 01042 01067 01051 01097 01147 01059 01092
No. Sample Chromium, Copper,Total Nickel,Total Lead,Total Antimony, Selenium, Thallium, Zinc,Total(as
Collected Total(as Cr) (as Cu) (as NO (as Pb) Total(as Sb) Total(as Se) Total(As Tl) Zn)
mo/dd/ r m m m m mgtL m m m
SWO07 06/22/17 0.00304 0.00469 0.00322 <0.001 <0.001 0.00145 <0.0002 0.107
Outfall Date 71900 C0530 34671 39488 39492 39496 39500 39504 39508 00556
No. Sample Mercury, Solids,Total PCB-1016 PCB-1221 PCB-1232 PCB-1242 PCB-1248 PCB-1254 PCB-1260 Oil&
Collected Total,Method Suspended- (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor Grease
1631E Concentration 1016) 1221) 1232) 1242) 1248) 1254) 1260)
mo/dd/ r n m m
SW007 106/22/17 15.22 112 <0.40 1 <0.40 1 <0.40 1<0.40 1 <0.40 1 <0.40 1 <0.40 1 <0.40
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/yr inches mg/L
SWO08 06/22/17 10.07 16.77 1220
Form SWU-247, last revised 21212012
Page 2 of 4

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Outfall Date 00400 C0530 34671 39488 39492 39496 39500 39504 39508
No. Sample Total pH Solids,Total PCB- PCB- PCB- PCB- PCB-1248 PCB- PCB-
Collected Rainfall Suspended- 1016 1221 1232 1242 (Arochlor 1254 1260
Concentration (Arochlo (Arochlo (Arochlo (Arochlo 1248) (Arochlo (Arochlo
r 1016) r 1221) r 1232) r 1242) r 1254) r 1260)
mo/dd/ r I inches m
SW009 06/22/17 10.07 16.72 140 <0.40 1<0.40 1 <0.40 1 <0.40 1 <0.40 1 <0.40 1 <0.40
Outfall Date 00400 C0530 01027 01034 01051 01092
No. Sample Total pH Solids,Total Cadmium, Chromium, Lead,Total Zinc,Total
Collected Rainfall Suspended- Total(as Cd) Total(as Cr) (as Pb) (as Zn)
Concentration
mo/dd/ r inches m m m m m
SW011 ------- 10.07 7.18 32 I <0.001 10.00208 10.00161 10.106
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
SW012 06/22/17 10.07 147
Outfall Date
No. Sample Total
Collected Rainfall
mo/dd/ r inches
SWO12A ------- NO FLOW
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
S—WO 22 06/22/17 10.07 7.57 169
Outfall Date
No. Sample Total
Collected Rainfall
mo/dd/ r inches
SW023 ------- NO FLOW
Form SWU-247, last revised 21212012
Page 3 of 4

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
No Permit Benchmarks were exceeded for Year 2 Period 1 sampling and reporting. Four Outfalls are reported as NO FLOW:SW004,SWD11,SWO12A and SW023.
The following lab information is noted:Arsenic was detected in blank at a concentration greater than half the reporting limit but less than the reporting limit. Analyte
concentration in sample is valid and may be used for compliance purposes.
Does this facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month?_yes X no
(if yes,complete Part B)
Part B: Vehicle Maintenance Ac ivity Monitoring Requirements
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/ r MG inches m Ing/l unit }a1/Ino
STORM EVENT CHARACTERISTICS: Mail Original and one copy to:
Division of Water Quality
Date 06/22/2017 Attn: Central Files
Total Event Precipitation(inches): 0.07 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.)
"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."
zyd, D? S
(Signature of Permittee) (Date)
Form SWU-247, last revised 21212012
Page 4 of 4

STORMWATER DISCHARGE OUTFALL(SDO)
_ MONITORING REPORT
RECEIVED
Permit Number NCS000548 FEB 14 2017 SAMPLES COLLECTED DURING CALENDAR YEAR: 2016
(This monitoring report shall be received by the Division no later than 30 days from
CENTRAL FILES the date the facility receives the sampling results from the laboratory.)
DWR 'SECTION
FACILITY NAME Marshall Steam Station COUNTY Catawba
PERSON COLLECTING SAMPLE(S)Staff PHONE NO. (80U)777-9898
CERTIFIED LABORATORY(S)Duke Energy of the Carolinas LLC Lab#248
Shealy Environmental Services NC Lab#329
SIGNATURE OF PERMITTEE OR DESIGNEE
REQUIRED ON PAGE 4.
Part A: Specific Monitoring Requirements
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches mgtL
SW001/SW001A 12/29/2016 10.15 17.34 160
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
molddl r inches mgtL
SW002 12/29/2016 10.15 17.05 5.0
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
moldd/ r inches m L
SW003 12/29/2016 0.15 7.43 130
Outfall Date
No. Sample Total
Collected Rainfall
mo/dd/vr inches
SWO04 ---- NO FLOW
Form SWU-247, last revised 2/2/2012
Page l ol'4

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
SWO06 12/29/2016 10.15 147
Outfall Date 50050 00400 01077 01002 01022 01012 01027
Sample Total Total pH Silver,Total(as Arsenic, Boron,Total Beryllium, Cadmium,
No. Collected Flow(if app.) Rainfall Ag) Total(as As) (as B) Total(as Be) Total(as Cd)
mo/dd/ r MG inches m mg1L m m m
SWO07 12/29/2016 NA 10.15 16.99 1 <0.0003 10.00191 <0.05 <0.001 <0.001
Outfall Date 01034 01042 01067 01051 01097 01147 01059 01092
No. Sample Chromium, Copper,Total Nickel,Total Lead,Total Antimony, Selenium, Thallium, Zinc,Total(as
Collected Total(as Cr) (as Cu) (as Ni) (as Ph) Total(as Sh) Total(as Se) Total(As TI) Zn)
mo/dd/ r mgtL m mg1L m L mgfL mg1L m m
SWO07 12/29/2016 0.00335 0.00963 0.00486 0.00319 <0.001 <0.00153 <0.0002 0.075
Outfall Date 71900 C0530 34671 39488 39492 39496 39500 39504 39508 00556
No. Sample Mercury, Solids,Total PCB-1016 PCB-1221 PCB-1232 PCB-1242 PCB-1248 PCB-1254 PCB-1260 Oil&
Collected Total,Method Suspended- (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor Grease
1631E Concentration 1016) 1221) 1232) 1242) 1248) 1254) 1260)
mo/dd/ r n m m
SW607 12/29/2016 16.88 146 <0.40 1 <0.40 1 <0.40 1 <0.40 1 <0.40 1 <0.40 1 <0.40 1 <4.0
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
SWO08 12/29/2016 10.15 17.56 186
Form SWU-247, last revised 2122012
Page 2 of 4

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Outfall Date 00400 C0530 34671 39488 39492 39496 39500 39504 39508
No. Sample Total pH Solids,Total PCB- PCB- PCB- PCB- PCB-1248 PCB- PCB-
Collected Rainfall Suspended- 1016 1221 1232 1242 (Arochlor 1254 1260
Concentration (Arochlo (Arochlo (Arochlo (Arochlo 1248) (Arochlo (Arochlo
r 1016) r 1221) r 1232) r 1242) r 1254) r 1260)
mo/dd/ r I inches m
SW009 12/29/2016 10.15 17.10 131 <0.40 1 <0.40 1 <0.40 1 <0.40 1 <0.40 1 <0.40 1 <0.40
Outfall Date
No. Sample Total
Collected Rainfall
mo/dd/ r inches
SWO11 ------- NO FLOW
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
SWO12 12/29/2016 10.15 6.72 46
Outfall Date
No. Sample Total
Collected Rainfall
mo/dd/ r inches
SWO12A ------ INOFLOW
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
SW022 12/29/2016 10.15 16.91 1 <5
Outfall Date
No. Sample Total
Collected Rainfall
mo/dd/ r inches
SW023 ------- NO FLOW
Form SWU-247,last revised 2/MO12
Page 3 of 4

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
No Permit Benchmarks were exceeded for Year 2 Period 1 sampling and reporting. Four Outfalls are reported as NO FLOW: SW004,SW011,SW012A and SW023.
The following lab information is noted: Arsenic was detected in blank at a concentration greater than hall the reporting limit but less than the reporting limit. Analyze
concentration in sample is valid and may he used for compliance purposes.
Does this facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month? yes X no
(if yes,complete Part B)
Part B: Vehicle Maintenance Activity Monitoring Requirements
Outfall Date 50050 00556 00530 00400
No. Sample Total Flow Total Oil &Grease Non-polar Total pH New Motor
Collected (i€applicable) Rainfall (if appl.) O&G1TPH Suspended Oil Usage
(Method 1664 Solids
SGT-HEM),if
appl.
mo/ddl r MG inches mwi m unit gallnio
STORM EVENT CHARACTERISTICS: Mail Original and one copy to:
Division of Water Quality
Date 12/29/2017 Attn: Central Files
Total Event Precipitation(inches): 0.15 1617 Mail Service Center
Event Duration(hours): (only if applicable—see permit.) Ralcigh.North Carolina 27699-1 6 1 7
(if more than one storm event was sampled)
Date
Total Event Precipitation(inches):
Event Duration(hours): (only if applicable—see permit.)
"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."
_4z/-/,/ :3 / �l
(S� nature of Permitte (Date)
Form SWU-247, last revised 21212012
Page 4 of 4

DUKE DUKE ENERGY CORPORATION
�C ENERGY® Marshall Steam Station
8320 East NC Highway 150
Terrell, NC 28682
February 9, 2017
NC Dept. of Environmental Quality
Attention: Central Files
Division of Water Resources
1617 Mail Service Center RECEIVED
Raleigh, NC 27699-1617 FEB 14
Subject: Duke Energy Carolinas, LLC � ��
NPDES Stormwater Discharge Monitoring Report for: CENTRAL FILES
Marshall Steam Station - NCS000548 — Catawba County DWFx SECTION
Year 2 - Period 1 Final Results
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 containing results of
the Tier II Period 1 sampling is attached. This submittal also completes Tier II monthly sampling for
stormwater outfalls SWO08 and SWO12.
Representative samples were collected from Outfalls SW001, SW002, SW003, SW006, SW007,
SWO08, SW009, SWO12, and SW022 on December 29, 2016. Outfalls SW004, SW011, SW012A
and SW023 are reported as NO FLOW for the period as a result to insufficient rain accumulation
during a single event for this Period as observed at Marshall Steam Station.
All sampled outfalls are reported with corresponding analytical results below permit benchmarks
for Year 2 Period 1.
A Tier II stormwater management inspection was completed for stormwater systems SWO08 and
SWO12 on July 29, 2016, following receipt of Year 1 Period 2 analytical results. Current BMPs are
being managed and continue to appear to be effective in reducing total suspended solids (TSS) in
representative outfall samples. Results of Tier II stormwater sampling and analyses of Outfalls
SWO08 and SWO12 are reported for three consecutive monthly events below the permit
benchmarks. Thus, these outfalls will return to permit-required semi-annual monitoring status.
Results of historical Tier inspections, analytical reports and DMRs are maintained in the
Stormwater Pollution Prevention Plan on site.
Please direct any correspondence or questions concerning the Marshall Steam Station NPDES
Stormwater Program to Brad Loveland at [phone],
SinceI rely,
q
l.�
Rick R. Roper
General Manager III
Marshall Steam Station
www.duke-energy.com

DUKE ENERGY CORPORATION
Marshall Steam Station
8320 East NC Highway 150
Terrell,NC 28682
be w/attachment: Scott La Sala
Brad Loveland
Tina Woodward
File: CCP EHS
UPS Tracking Number 1Z8955X40399177869 Raleigh Central Office
www.duke-energy.com

DUKE DUKE ENERGY CORPORATION
ENERGY Marshall Steam Station
8320 East NC Highway 150
Terrell, NC 28682
December 20, 2016 RECEIVED
NC Dept. of Environmental Quality DEC 2 2 2016
Attention: Central Files
Division of Water Resources CENTRAL FILES
1617 Mail Service Center DWR SECTION
Raleigh, NC 27699-1617
Subject: Duke Energy Carolinas, LLC
NPDES Stormwater Discharge Monitoring Report for:
Marshall Steam Station - NCS000548 -- Catawba County
Year 2 -Tier 11 Monthly Sampling Results
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 containing results of
the Tier II monthly sampling is attached. This submittal completes Month 4 Tier II sampling for
stormwater outfalls SWO08 and SWO12.
Representative samples were not collected from SWO08 and SWO12 on during November 2016 as
a result to NO FLOW conditions. This report is submitted as a formal notification of the NO PLOW
conditions at the site for November 2016.
A Tier II stormwater management inspection was completed for stormwater systems SW008 and
SWO12 on July 29, 2016, following receipt of Year 1 Period 2 analytical results. Current BMPs are
being managed and continue to appear to be effective in reducing total suspended solids (TSS) in
representative outfall samples. Results of inspections and analytical data are maintained in the
Stormwater Pollution Prevention Plan on site.
Please direct any correspondence or questions concerning the Marshall Steam Station NPDES
Stormwater Program to Brad Loveland at [phone].
Sincerely,
J7W-'-
Rick R. Roper
General Manager 111
Marshall Steam Station
www.duke-energy.com

DUKE ENERGY CORPORATION
Marshall Steam Station
8320 East NC Highway 150
Terrell,NC 28682
be w/attachment: Scott La Sala
Brad Loveland
Tina Woodward
File: CCP EHS
UPS Tracking Number IZ8955x4039102145i Raleigh Central Office
www.duke-energy.com

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Permit Number NCS000548 SAMPLES COLLECTED DURING CALENDAR YEAR: 2016
(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.)
FACILITY NAME Marshall Steam Station COUNTY Catawba
PERSON COLLECTING SAMPLE(S)Staff PHONE NO. [phone]
CERTIFIED LABORATORY(S)Dube Energy of the Carolinas LLC Lab#248
SIGNATURE OF PERMITTEE OR DESIGNEE
REQUIRED ON PAGE 2.
Part A: Specific Monitoring Requirements
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m L
SW008 NO FLOW --- --- ---
Outl'all Date 00400 C0530 RECEIVED
No. Sample Total pH Solids,Total 2
Collected Rainfall Suspended-
Concentration t=E1+lT� 7
D t
Lh
mo/dd/ r inches m L R SECTION
SW012 NO FLOW --- --- ---
TSS was not sampled from either SWO08 or SWO12 on during November 2016 as a result to NO FLOW conditions.
Form SWU-247.last revised 21212012
Page 1 of 2

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
(if yes,complete Part B)
Part B: Vehicle Maintenance Activity Monitoring Requirements
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&GITPH Suspended Oil Usage
(Method 1664 Solids
SGT-HEM),if
avol.
rnolddhyr I MG linches MgA mgn gall/mo
STORM EVENT CHARACTERISTICS: Mail Original and one copy to:
Division of Water Quality
Date NO FLOW Attn: Central Files
Total Event Precipitation(inches): NA 1617 Mail Service Center
Event Duration(hours): (only if applicable—see permit.) Raleigh,North Carolina 27699-16I7
(if more than one storm event was sampled)
Date
Total Event Precipitation(inches):
Event Duration(hours): (only if applicable—see permit.)
"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."
I
(Si ature of ermitt (Date)
Form SWU-247,last revised 21212012
Page 2 of 2
i

DUK
E DUKE ENERGY CORPORATION
ENE
RGY. Marshall Steam Station
6320 East NC Highway 150
Terrell, NC 28682
October 12, 2016
NC Dept. of Environmental Quality RECOVE
Attention: Central Files
Division of Water Resources OCT 17 2016
1617 Mail Service Center CENTRAL FILES
Raleigh, NC 27699-1617 DwR SECTION
Subject: Duke Energy Carolinas, LLC
NPDES Stormwater Discharge Monitoring Report for:
Marshall Steam Station - NCS000548 — Catawba County
Year 2 - Tier II Monthly Sampling Results
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 containing results of
the Tier II monthly sampling is attached. This submittal completes Month 1 Tier Ii sampling for
stormwater outfalls SWO08 and SWO12.
Representative samples were collected from SWO08 and SWO12 on September 1, 2016. The
corresponding laboratory analytical report was received September 14, 2016. A summary of
reported analytical results compared to corresponding permit benchmarks is provided below.
Reported
Permitted gnalyte Concentration Permit
Outfall Benchmark
or Value
SWO08 TSS 21 mg/I 100 mg/I
SWO12 TSS 29 mg/I 100 mg/I
A Tier II stormwater management inspection was completed for stormwater systems SW008 and
SWO12 on July 29, 2016, following receipt of Year 1 Period 2 analytical results. Current BMPs are
being managed and appear to be effective in reducing total suspended solids (TSS) in
representative outfall samples. Results of inspections and analytical data are maintained in the
Stormwater Pollution Prevention Plan on site.
Please direct any correspondence or questions concerning the Marshall Steam Station NPDES
Stormwater Program to Brad Loveland at [phone].
S' ;k .
gi ,
Ric Roper
General Manager III
Marshall Steam Station
www.duke-energy.com

a DUKE ENERGY CORPORATION
Marshall Steam Station
8320 East NC Highway 150
Terrell,NC 28682
be w/attachment: Scott La Sala
Brad Loveland
Tina Woodward
File: CCP EHS
UPS Tracking Number IZ8955X40396082789 Raleigh Central Office
www.duke-energy.com

STORMWATER DISCHARGE OUTFALL (SDO)
MONITORING REPORT
Permit Number NCS000548 SAMPLES COLLECTED DURING CALENDAR YEAR: 2016
(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.)
FACILITY NAME Marshall Steam Station COUNTY Catawba
PERSON COLLECTING SAMPLE(S)Staff PHONE NO.[phone]
CERTIFIED LABORATORY(S)Duke Energy of the Carolinas,LLC Lab#248
SIGNATURE OF PERMITTEE OR DESIGNEE
REQUIRED ON PAGE 2.
Part A: Specific Monitoring Requirements
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m L
SWO08 9/1/2016 0.08 6.98 21
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/yr inches m
SW012 9/1/2016 10.08 6.57 29
TSS was reported below the benchmark for Tier 11 monthly samples collected from both SWO08 and SWO12 on September 1,2016.
REC-E 50
O C T 11 2016
CENTRAL FILES
DWZ SECTION
Form SWU-247, last revised 2/2/20I2
Page 1 of 2

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
(if yes, complete Part B)
Part B: Vehicle Maintenance Activity Monitoring Requirements
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/ r MG inches MgA m9A unit al/mo
STORM EVENT CHARACTERISTICS: Mail Original and one copy to:
Division of Water Quality
Date 9/1/2016 Attn: Central Files
Total Event Precipitation(inches): 0.08 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.)
"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 Permit e) (Da 60
Form SWU-247, last revised 2212012
Page 2 of 2

DUKE DUKE ENERGY CORPORATION
ENERGY,, Marshall Steam Station
8320 East NC Highway 150
Terrell, NC 28682
November 2, 2016 » � -- T
NC Dept. of Environmental Quality QCI 16 Z016
Attention: Central Files
Division of Water Resources CEN-T-tR4-HLES
1617 Mail Service Center FjVJR SECTION
Raleigh, NC 27699-1617
Subject: Duke Energy Carolinas, LLC
NPDES Stormwater Discharge Monitoring Report for:
Marshall Steam Station - NCS000548 — Catawba County
Year 2 - Tier II Monthly Sampling Results
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 containing results of
the Tier II monthly sampling is attached. This submittal completes Month 3 Tier II sampling for
stormwater outfalls SWO08 and SWO12.
Representative samples were not collected from SWO08 and SWO12 on during October 2016 as a
result to NO FLOW conditions. This report is submitted as a formal notification of the NO FLOW
conditions at the site for October 2016.
A Tier II stormwater management inspection was completed for stormwater systems SWO08 and
SWO12 on July 29, 2016, following receipt of Year 1 Period 2 analytical results. Current BMPs are
being managed and continue to appear to be effective in reducing total suspended solids (TSS) in
representative outfall samples. Results of inspections and analytical data are maintained in the
Stormwater Pollution Prevention Plan on site.
Please direct any correspondence or questions concerning the Marshall Steam Station NPDES
Stormwater Program to Brad Loveland at [phone].
Sincerely,
� 'k �a�
Rick R. Roper
General Manager III
Marshall Steam Station
www.duke-energy.com

DUKE ENERGY CORPORATION
Marsha!!Steam Station
8320 East NC Highway 150
Terre!!,NC 28682
be w/attachment: Scott La Sala
Brad Loveland
Tina Woodward
File: CCP EHS
UPS Tracking Number 1Z8955X40398571050 Raleigh Central Office
www.duke-energy.com

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Permit Number NCS000548 SAMPLES COLLECTED DURING CALENDAR YEAR: 2016
(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.)
FACILITY NAME Marshall Steam Station COUNTY Catawba
PERSON COLLECTING SAMPLE(S)Staff PHONE NO. [phone]
CERTIFIED LABORATORY(S)Duke Energy of the Carolinas LLC Lab#248
SIGNATURE OF PERMITTEE OR DESIGNEE
REQUIRED ON PAGE 2.
Part A: Specific Monitoring Requirements
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches mgfL
SWO08 NO FLOW --- --- ---
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
SW012 NO FLOW --- --- ---
TSS was not sampled from either SWO08 or SWO12 on during October 2016 as a result to NO FLOW conditions.
RECEIVED
OCT 16 Lui,
CENTRAL RAL r-ILE8
DWR SECTION
Form SWU-247, last revised 2/2/2012
Page I of 2

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
(if yes,complete Part B)
Part B: Vehicle Maintenance Activity Monitoring Requirements
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&GITPH Suspended Oil Usage
(Method 1664 Solids
SGT-HEM),if
appl.
mo/dd/ r MG inches unit gal/mo
STORM EVENT CHARACTERISTICS: Mail Original and one copy to:
Division of Water Quality
Date NO FLOW Attn: Central Files
Total Event Precipitation(inches): NA 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.)
"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)
(Signature of Permittee (Date)
Form SWU-247, last revised 21212012
Page 2 of 2

DUKE DUKE ENERGY CORPORATION
ENERGY Marsha„Steam Station
8320 East NC Highway 150
Terre!!, NC 28682
November 2, 2016
ECEIVEo
NC Dept. of Environmental Quality
Attention: Central Files 6 2016
Division of Water Resources CEN-MP- r_ ES
1617 Mail Service Center DWF~ SECT-1O- N
Raleigh, NC 27699-1617
Subject: Duke Energy Carolinas, LLC
NPDES Stormwater Discharge Monitoring Report for:
Marshall Steam Station - NCS000548— Catawba County
Year 2 - Tier II Monthly Sampling Results
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 containing results of
the Tier II monthly sampling is attached. This submittal completes Month 2 Tier II sampling for
stormwater outfalls SWO08 and SWO12.
Representative samples were collected from SWO08 and SWO12 on September 26, 2016. The
corresponding laboratory analytical report was received October 6, 2016. A summary of reported
analytical results compared to corresponding permit benchmarks is provided below.
Reported
Permitted Analyte Concentration Permit
Outfall or Value Benchmark
SWO08 TSS 17 mg/I 100 mg/I
SWO12 ASS 16 mg/I 100 mg/I
A Tier it stormwater management inspection was completed for stormwater systems SWO08 and
SWO12 on July 29, 2016, following receipt of Year 1 Period 2 analytical results. Current BMPs are
being managed and continue to appear to be effective in reducing total suspended solids (TSS) in
representative outfall samples. Results of inspections and analytical data are maintained in the
Stormwater Pollution Prevention Plan on site.
Please direct any correspondence or questions concerning the Marshall Steam Station NPDES
Stormwater Program to Brad Loveland at [phone].
Sincerely,
Rick R. Roper
General Manager Ill
Marshall Steam Station
www.duke-energy.com

DUKE ENERGY CORPORATION
Marshall Steam Station
8320 East NC Highway 150
Terrell,NC 28682
be w/attachment: Scott La Sala
Brad Loveland
Tina Woodward
File: CCP EHS
UPS Tracking Number 1Z8955X40398571050 Raleigh Central Office
www.duke-energy.com

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Permit Number NCS000548 SAMPLES COLLECTED DURING CALENDAR YEAR: 2016
(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.)
FACILITY NAME Marshall Steam Station COUNTY Catawba
PERSON COLLECTING SAMPLE(S)Staff PHONE NO.[phone]
CERTIFIED LABORATORY(S)Duke Energy of the Carolinas,LLC Lab#248
SIGNATURE OF PERMITTEE OR DESIGNEE
REQUIRED ON PAGE 2.
Part A: Specific Monitoring Requirements
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
moldd/ r inches m
SWO08 9/26/2016 0.76 7.18 117
Outfall Date 00=400 C0530
No. Sample Total PH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/ddl r inches m L
SWO12 9/26/2016 10.76 6.99 116
TSS was reported below the benchmark for Tier It monthly samples collected from both SWO08 and SW012 on September 26,2016.
OCT 16 2U
CENTRAL FILE=,
D1+IR SEC MI,
I,
Form SWU-247, last revised 21212012
Page I of 2

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Does this facility perform Vehicle Maintenance Activities using more than 55 ;allons of new motor oil per month?_yes X no
(if yes,complete Part B)
Part B: Vehicle Maintenance Activity Monitoring Requirements
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/ ,r tNIG inches mg/l m unit gal/mo
STORM EVENT CHARACTERISTICS: Mail Original and one copy to:
Division of Water Quality
Date 9/26/2016 Attn: Central Files
Total Event Precipitation(inches): 0.76 1617 Mail Service Center
Event Duration (hours): (only if applicable—see permit.) Ralcigh,North Carolina 27699-1 6 1 7
(if more than one storm event was sampled)
Date
Total Event Precipitation(inches):
Event Duration(hours): (only if applicable—see permit.)
"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."
A t�k
(Signature of Permittee) (Date)
Form SWU-247,fast revised 2IM012
Page 2 of 2

4�' DUKE DUKE ENERGY CORPORATION
ENERGY. Marshall Steam Station
8320 Fast NC Highway 150 a
Terrell, NC 28682
August 11, 2016
NC Dept. of Environmental Quality
Attention: Central Files
Division of Water Resources '"
1617 Mail Service Center s F: " AUG 1 2 16
Raleigh, NC 27699-1617
CENTRAL FILES
Subject: Duke Energy Carolinas, LLC DWR SECTION
NPDES Stormwater Discharge Monitoring Report for:
Marshall Steam Station - NCS000548 — Catawba County
Year 1 — Period 2
Dear Sir or Madam:
In accordance with Part 111, E(2) of the above referenced NPDES Stormwater permit, the original
and one copy of the Stormwater Discharge Outfall (SDO) monitoring reports completing Year 1 —
Period 2 are attached. This submittal completes reporting requirements for this period of sampling
ending on June 30, 2016.
Representative samples were collected from SW001/1A, SW002, SW003, SW006, SW007,
SW008, SW009, SW012, SW012A, SW022 and SW023 on June 27, 2016. The corresponding
laboratory analytical report was received July 14, 2016. A summary of analytes reported at
concentrations above permit benchmarks is provided below.
Permitted Reported Permit
Outfall Analyte Concentration Benchmark
or Value
SWO06 TS5 320 mg/I 100 mg/I
SW008 TSS 160 mg/I 100 mg
SW012 TSS 200 mg/I 100 mg/I
Outfalls SW004 and SW011 were not observed discharging stormwater during Period 2 and
subsequently are reported with "no flow" status.
Pursuant to permit requirements, a Tier 1 stormwater management inspection was completed for
the SW006 stormwater system within two weeks of receiving sample results. Additionally, a Tier
2 stormwater management inspection was completed for stormwater systems SW008 and SW012
and subsequently these outfalls have been placed into a monthly sampling program. Results of
inspections and analytical data are maintained in the Stormwater Pollution Prevention Plan on
site.
Please direct any correspondence or questions concerning the Marshall Steam Station NPDES
Stormwater Program to Brad Loveland at [phone].
Si ereIy,
Rick R. Roper
General Manager III
Marshall Steam Station
www.duke-energy.com

DUKE ENERGY CORPORATION
Marshall Steam Station
8320 East NC Highway 150
Terrell,NC 28682
be w/attachment: Scott La Sala
Brad Loveland
Tina Woodward
File: CCP EHS
UPS Tracking Number 1Z89SSX40395319481 Raleigh Central Office
www.duke-energy.com

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Permit Number NCS000548 SAMPLES COLLECTED DURING CALENDAR YEAR: 2016
(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.)
FACILITY NAME Marshall Steam Station COUNTY Catawba
PERSON COLLECTING SAMPLE(S)Staff PHONE NO. [phone]
CERTIFIED LABORATORY(S)Duke Energy of the Carolinas, LLC Lab#248
Shealy Environmental Services,NC Lab#329
SIGNATURE OF PERMITTEE OR DESIGNEE
R_EQUIRED ON PAGE 4.
Part A: Specific Monitoring Requirements
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended -
Concentration
mo/dd/ r inches MEL
SW001/SW001A 6/27/2016 10.98 7.35 114
Outfall Date 00400 C0530
No. Sample Total p1i Solids,Total
Collected Rainfall Suspended- 'RECEIVED
Concentration
mo/dd/yr inches m L RU67 15 Z016
SWO02 6/27/2016 0.95 7.52 11 VENTRAL FILES
Outfall Date 00400 C0530 DWR SECTION
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/ddl r I inches I I MOL
SWO03 6/27/2016 10.98 17.47 179
Outfall Date
No. Sample Total
Collected Rainfall
mo/dd/ r inches
SWO04 ---- NO FLOW
Form SWU-247,last revised 21212012
Page 1 of 4

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Outfall Date 00400 CO530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
SW006 6/27/2016 10.98 7.77 1320
Outfall Date 50050 00400 01077 01002 01022 01012 01027
No. Sample Total Total pH Silver,Total(as Arsenic, Boron,Total Beryllium, Cadmium,
Collected Flow(if app.) Rainfall Ag) Total(as As) (as B) Total(as Be) Total(as Cd)
mo/dd/ r MG inches m m m m m
SW007 6/27/2016 1 N/A 10.98 7.22 1 <0.0003 1<0.001 <0.05 <0.001 <0.001
Outfall Date 01034 01042 01067 01051 01097 01147 01059 01092
No. Sample Chromium, Copper,Total Nickel,Total Lead,Total Antimony, Selenium, Thallium, Zinc,Total(as
Collected Total(as Cr) (as Cu) (as NO (as Pb) Total(as Sb) Total(as SO Total(As Tl) Zn)
mo/dd/ r m m mgtL m m mgtL m m
SW007 6/27/2016 0.00134 0.00404 0.00208 0.00138 <0.001 <0.001 <0.0002 0.069
Outfall Date 71900 CO530 34671 39488 39492 39496 39500 39504 39508 00556
No. Sample Mercury, Solids,Total PCB-1016 PCB-1221 PCB-1232 PCB-1242 PCB-1248 PCB-1254 PCB-1260 Oil&
Collected Total,Method Suspended- (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor Grease
1631E Concentration 1016) 1221) 1232) 1242) 1248) 1254) 1260)
mo/dd/ r n m m
SW007 6/27/2016 6.20 39 <0.4 <0.4 <0.4 <0.4 <0.4 <0.4 <0.4 <4
!!t7d
Outfall Date 00400 CO530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
SW008 6/27/2016 10.98 7.24 1160
Form SWU-247,last revised 2122012
Page 2 of 4

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Outfall Date C0530 34671 39488 39492 39496 39500 39504 39508
No. Sample Total Solids,Total PCB-1016 PCB-1221 PCB-1232 PCB-1242 PCB-1248 PCB-1254 PCB-1260
Collected Rainfall Suspended- (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor
Concentration 1016) 1221) 1232) 1242) 1248) 1254) 1260)
mo/dd/ r inches m
SW009 6/27/2016 10.98 192 <0.4 <0.4 <0.4 <0.4 <0.4 <0.4 <0.4
Outfall Date
No. Sample Total
Collected Rainfall
mo/dd/ r inches
SW011 ------- NO FLOW
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
SWO12 6/27/2016 10.98 16.33 1200
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
SWO12A 6/27/2016 0.98 18.06 19 71
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches m
SW022 6/27/2016 10.98 17.80 163
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches mgtL
SW023 6/27/2016 10.98 7.84 11
Form SWU-247,last revised 2212012
Page 3 of 4

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
TSS was exceeded at SWO06,SWOOS,and SWO12.
The following lab information is noted: The SWO09 PCB MS/MSD failed bias low for 1260 @ 45% and 50%, but the LCS passed all criteria.
The SWO07 Oil&Grease MS failed bias low @ 55%, but the LCS passed all criteria.
Does this facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month?_yes X no
(if yes,complete Part 13)
Part B: Vehicle Maintenance Ac ivity Monitoring Requirements
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
a l-
mo/dd/ r MG inches m rn unit al/mo
STORM EVENT CHARACTERISTICS: Mail Original and one copy to:
Division of Water Quality
Date 6/27/2016 Attn: Central Files
Total Event Precipitation(inches): 0.98 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.)
"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 Permitt (Da e)
Form SWU-247, last revised 21212012
Page 4 of 4

9 0/
-5�-
DUKE DUKE ENERGY CORPORATION
�C ENERGY® Marshall Steam Station
8320 East NC Highway 150
Terrell, NC 28682
January 28, 2016
RECEIVED
NC Dept. of Environmental Quality
Attention: Central Files FEB O 1 2cli�
Division of Water Resources CEt•,TRAL FILES
1617 Mail Service Center DWR SECTION
Raleigh, NC 27699-1617
Subject: Duke Energy Carolinas, LLC
NPDES Stormwater Discharge Monitoring Report for:
Marshall Stearn Station - NCS000548- Catawba County
Year 1 -Period I
Dear Sir or Madam:
In accordance with Part 111, E(2) of the above referenced NPDES Stormwater permit, the
original and one copy of the Stormwater Discharge Outfall (SDO) monitoring reports
completing Year 1 - Period 1 (second of two submittals) are attached. The previous Year
1 - Period 1 submittal containing SDO monitoring reports for outfalls SW002, SW003,
SW004, SWO12A and SW023 was submitted to the NC Division of Water Resources on
January 12, 2016. This submittal completes reporting requirements for this period of
sampling ending on December 31, 2015.
Representative samples were collected from SW001/1A, SW006, SW007, SWO08 and
SWO09 on December 14, 2015. A representative sample was also collected at SW011 on
December 17, 2015. Corresponding laboratory analytical reports December 31 , 2015 (for
SW011) and January 7, 2016 (for the remaining samples). A summary of anaiytes
reported at concentrations above permit benchmarks is provided below.
Permitted ReportedAnalyte Concentration Permit
Outfall or Value Benchmark
SWO07 Zinc 0.173 mg/I 0.126 mg/I
pH 9.35 SU 6-9 SU
SWO08 T55 380 mg/I 100 mg/I
pH 9.36 SU 6-9 SU
SWO12 TSS 330 mg/I 100 mg/I
SW022 TSS 160 mg/I 100 mg/I
pH 9.45 SU 6-9 SU
Pursuant to permit requirements, a Tier 1 stormwater management inspection was
completed for the referenced stormwater systems within two weeks of receiving sample
www.duke-energy.com

DUKE DUKE ENERGY CORPORATION
ENERGY® Marshall Steam Station
8320 East NC Highway 150
Terrell, NC 28682
results. Results of these inspections are maintained in the Stormwater Pollution
Prevention Plan on site.
Please direct any correspondence or questions concerning the Marshall Steam Station
NPDES Stormwater Program to Brad Loveland at [phone].
Sincerely,
Rick R. Roper
General Manager III
Marshall Steam Station
be w/attachment: Scott La Sala
Brad Loveland
Tina Woodward
File: CCP EHS
UPS Tracking Number 1Z8955X40390452087 Raleigh Central Office
www.duke-energy.com

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Permit Number NCS000548 SAMPLES COLLECTED DURING CALENDAR YEAR:2015
(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.)
FACILITY NAME Marshall Steam Station COUNTY Catawba
PERSON COLLECTING SAMPLE(S)Staff PHONE NO.L800)777-9898
CERTIFIED LABORATORY(S)Duke Enery-y of the Carolinas,LLC Lab#248 -
SIGNATURE OF PERMITTEE OR DESIGNEE
71
REQUIRED ON PAGE 2.
Part A:Specific Monitoring Requirements
Outfall Date 50050 00400 01077 01002 01022 01012 01027
No. Sample Total Total pH Silver,Total(as Arsenic, Boron,Total Beryllium, Cadmium,
Collected Flow(if app.) Rainfall Ag) Total(as As) (as B) Total(as Be) Total(as Cd)
mo/dd/ r MG inches SU mg1L m L m L m L m L
SNV00l1SW001A 12/14/2015 1 NIA 10.1 17.00 <0.0003 10.00236 <0.05 <0.001 <0.001
Outfall Date 01034 01042 01067 01051 01097 01147 01059 01092
No. Sample Chromium, Copper,Total Nickel,Total Lead,Total Antimony, Selenium, Thallium, Zinc,Total
Collected. Total(as Cr) (as Cu) (as Ni) (as Ph) Total(as Sh) Total(as Se) Total(As TI) (as Zn)
mo/dd/ r m L mg1L m L mg1L m L m mg1L m
SWOOI/SWO01A 12/14/2015 0.0091 0.00355 0.00151 0.00144 <0.001 <0.001 <0.0002 0.042
Outfall Date 71900 C0530
No. Sample Mercury, Solids,Total
Collected Total,Method Suspended-
1631E Concentration
mo/dd/ r n m
SW001/SW001A 12/14/2015 6.51 125
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches SU m
SWO06 12/14/2015 0.1 7.6 <5
Permit Number NCS000548 Form SWU-247,last revised 21212012
Page 1 of 4

Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches SU In
SWO12 112/14/2015 0.1 18.33 1330
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches SU m
SWO22 U/14/2015 10.1 19.45 1160
Exceedances include pH at SW007,Zinc(Zn)at SW007,pH at SW008,TSS at SW008,TSS at SW012,and TSS at SW022.
Flag A:Oil and Grease was collected in an unpreserved bottle and preserved later the same day prior to analysis.
Does this facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month?_yes X no
(if yes,complete Part B)
Part B:Vehicle Maintenance Activity Monitoring Requirements
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 m mgfi unit gavino
Permit Number NCS000548 Form SWU-247,last revised 21212012
Page 3of 4

Outfall Date 50050 00400 01077 01002 01022 01012 01027
No. Sample Total Total pH Silver,Total(as Arsenic, Boron,Total Beryllium, Cadmium,
Collected Flow(if app.) Rainfall Ag) Total(as As) (as B) Total(as Be) Total(as Cd)
mo/dd/yr MG inches SU m m m m m
SW007 12/14/2015 I N/A 0.1 1935 1 <0.0003 10.00145 <0.05 <0.001 <0.001
Outfall Date 01034 01042 01067 01051 01097 01147 01059 01092
No. Sample Chromium, Copper,Total Nickel,Total Lead,Total Antimony, Selenium, Thallium, Zinc,Total
Collected Total(as Cr) (as Cu) (as Ni) (as Pb) Total as Sb) Total(as Se) Total(As Tl) (as Zn
mo/dd/ m In m m9tL mgIL m mgtL m
SW007 12/14/2015 0.00336 0.00584 0.00322 0.00196 <0.001 0.00124 <0.0002 0.173
Outfall Date 71900 CO530 34671 39488 39492 39496 39500 39504 39508 00556
No. Sample Mercury, Solids,Total PCB-1016 PCB-1221 PCB-1232 PCB-1242 PCB-1248 PCB-1254 PCB-1260 Oil&
Collected Total,Method Suspended- (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor Grease
1631E Concentration 1016) 1221) 1232) 1242) 1248) 1254) 1260)
mo/dd/ n m m
SW007 12/14/2015 18.385 154 1 <0.4 1 <0.4 1<0.4 1 <0.4 <0.4 <0.4 <0.4 <4 Flag A
Outfall Date 00400 C0530
No. Sample Total pH Solids,Total
Collected Rainfall Suspended-
Concentration
mo/dd/ r inches SU In
SW008 12/14/2015 10.1 19.36 1380
Outfall Date 00400 CO530 34671 39488 39492 39496 39500 39504 39508
No. Sample Total pH Solids,Total PCB-1016 PCB-1221 PCB-1232 PCB-1242 PCB-1248 PCB-1254 PCB-1260
Collected Rainfall Suspended- (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor
Concentration 1016) 1221) 1232) 1242) 1248) 1254) 1260)
mo/dd/ r inches SU m
SWO09 112/14/2015 10.1 17.30 113 1 <0.4 1 <0.4 <0.4 <0.4 <0.4 <0.4 <0.4
Outfall Date 50050 00400 01034 01027 01051 01092 C0530
No. Sample Total Total pH Chromium, Cadmium, Lead,Total Zinc,Total Solids,Total
Collected Flow(if app.) Rainfall Total(as Total(as (as Pb) (as Zn) Suspended-
Cr) Cd) Concentration
mo/dd/ r MG inches m m m m m
SWO11 12/17/2015 1 N/A 11.12 16.89 1<0.001 I <0.001 I<0.001 10.0422 110
Permit Number NCS000548 Form SWU-247,last revised 21212012
Page 2of 4

STORM EVENT CHARACTERISTICS: Mail Original and one copy to:
Division of Water Quality
Date 12/14/2015 Attn: Central Files
Total Event Precipitation(inches):001 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 12/17/2015
Total Event Precipitation(inches): 1.12
Event Duration(hours): (only if applicable-see permit.)
"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
hest 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."
lax "-
of Permittee 1�
(Signature ) (Date)
Permit Number NCS000548 Form SWU-247, last revised 21212012
Page 4of 4

STORMWATER DISCHARGE OUTFALL(SDO)
MONITORING REPORT
Permit Number NCS000548 SAMPLES COLLECTED DURING CALENDAR YEAR: 2015
(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.)
FACILITY NAME Marshall Steam Station COUNTY Catawba
PERSON COLLECTING SAMPLE(S)Staff PHONE NO.[phone] r�
CERTIFIED LABORATORY(S)Duke Energy of the Carolinas,LLC Lab#248 �7
Shealy Environmental Services,NC Lab#329
SIGNATURE OF PERMITTEE OR DESIGNEE CW3
REQUIRED ON PAGE 2.
Part A: Specific Monitoring Requirements
Outfall Date 50050 00400 01077 01002 01022 01012 01027
No. Sample Total Total pH Silver,Total(as Arsenic, Boron,Total Beryllium, Cadmium,
Collected Flow(if app.) Rainfall Ag) Total (as As) (as B) Total(as Be) Total (as Cd)
mo/dd/ r MG inches m L mg1L rn m L m L
SWO02 11/30/2015 N/A 0.82 7.51 <0A003 0.00142 <0.05 <0.001 <0.001
Outfall Date 01034 01042 01067 01051 01097 01147 01059 01092
No. Sample Chromium, Copper,Total Nickel,Total Lead,Total Antimony, Selenium, Thallium, Zinc,Total(as
Collected Total (as Cr) (as Cu) (as Ni) (as Pb) Total (as Sb) Total(as Se) Total(As TI) Zn)
mo/dd/ r m L mgfL m m L m mgfL mgfL m L
SWO02 11/30/2015 0.00307 0.00788 0.00216 0.00289 <0.001 0.00132 <0.0002 0.02
Outfall Date 71900 C0530
No. Sample Mercury, Solids,Total
Collected Total,Method Suspended-
1631E Concentration
mo/ddl r ngtL m
SWO02 11/30/2015 17.00 47
Outfall Date 50050 00400 01077 01002 01022 01012 01027
No. Sample Total Total pH Silver,Total(as Arsenic, Boron,Total Beryllium, Cadmium,
Collected Flow(if app.) Rainfall Ag) Total(as As) (as B) Total(as Be) Total(as Cd)
mo/dd/ r MG inches m m L mg/L m�;IL m L
SW003 11/30/2015 NIA 0.82 7.62 <0.0003 0.00238 <0.05 <0.001 <0.001
Form SWU-247, last revised 21212012
Page 1 of 3

Outfall Date 01034 01042 01067 01051 01097 01147 01059 01092
No. Sample Chromium, Copper,Total Nickel,Total Lead,Total Antimony, Selenium, Thallium, Zinc,Total(as
Collected Total(as Cr) (as Cu) (as Ni) (as Pb) Total(as Sb) Total(as Se) Total(As TI) Zn)
mo/dd/ r m m mgtL m m m m m
SW003 11/30/2015 <0.001 0.00261 <0.001 <0.001 <0.001 0.00119 <0.0002 <0.005
Outfall Date 71900 CO530
No. Sample Mercury, Solids,Total
Collected Total,Method Suspended-
1631E Concentration
mo/dd/ r n mgIL
S—WO 03 11/30/2015 4.18 18
Outfall Date 50050 00400 01077 01002 01022 01012 01027
No. Sample Total Total pH Silver,Total(as Arsenic, Boron,Total Beryllium, Cadmium,
Collected Flow(if app.) Rainfall Ag) Total(as As) (as B) Total(as Be) Total(as Cd)
mo/dd/ r MG inches m m m m m
0.00657 0.079 <0.001SW004 11/30/2015 N/A 0.82 7.66
Outfall Date 01034 01042 01067 01051 01097 01147 01059 01092
No. Sample Chromium, Copper,Total Nickel,Total Lead,Total Antimony, Selenium, Thallium, Zinc,Total(as
Collected Total(as Cr) (as Cu) (as Ni) (as Ph) Total(as Sb) Total(as Se) Total(As Tl) Zn)
mo/dd/ r m m mgIL m mgtL mgtL m m
SW004 11/30/2015 <0.001 0.00328 <0.001 <0.001 <0.001 0.00296 <0.0002 <0.005
Outfall Date 71900 CO530 34671 39488 39492 39496 39500 39504 39508
No. Sample Mercury, Solids,Total PCB-1016 PCB-1221 PCB-1232 PCB-1242 PCB-1248 PCB-1254 PCB-1260
Collected Total,Method Suspended- (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor (Arochlor
1631E Concentration 1016) 1221) 1232) 1242) 1248) 1254) 1260)
mo/dd/ r n m
SW004 11/30/2015 113.4 122 <0.4 <0.4 <0.4 <0.4 <0.4 <0.4 <0.4
Outfall Date 50050 00400 CO530
No. Sample Total Flow(if Total Solids,Total
Collected app.) Suspended-
Concentration
mo/dd/ r MG Rainfall pH mgtL
SW012A 11/30/2015 1 N/A 0.82 7.47 7
Form SWU-247, last revised 2122012
Page 2 of 3

Outfall Date 50050 00400 CO530
No. Sample Total Flow(if Total Solids,Total
Collected app.) Suspended-
Concentration
mo/dd/ r MG Rainfall pH m
SW023 11/30/2015 1 NIA 10.82 7.77 -5
Does this facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month? yes X no
(if yes,complete Part B)
Part B: Vehicle Maintenance Activity Monitoring Requirements
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/ddl r MG inches m m unit gal/rno
Exceedances include Mercury(Hg)at SW004
STORM EVENT CHARACTERISTICS: Mail Original and one copy to:
Division of Water Quality
Date 1 1/30/2015 Attn: Central Files
Total Event Precipitation(inches): 0.82 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—sec permit.)
"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."
0!�,I :�/" 24)4, , I — (_�_—1 6>
(Signature of Permitte (Date)
Form SWU-247, last revised 2/2/2012
Page 3 of 3

DUKE DUKE ENERGY CORPORATION
ENERGY, Marshall Steam Station
8320 East NC Highway 150
Terrell, NC 28682
1anLiary 12, 2016
RECEIVED
NC Dept. of Environmental Quality JAN 14 2016
Attention: Central Files CENTRAL FILES
Division of Water Resources DktVR SECTION
1617 Mail Service Center
Raleigli, NC 27699-1617
Subject: Duke Energy Carolinas, LLC
NPDES Stormwater Discharge Monitoring Report for:
Marshall Steam Station - NCS000548— Catawba County
Year 1 —Period 1
Dear Sir or Madam:
In accordance with Part Ill, E(2) of the above referenced NPDES Stormwater permit, the
original and one copy of the monthly monitoring reports Year 1 — Period 1 are attached.
The period for sampling ended on December 31 , 2015.
Samples were collected from SW002, SW003, SW004, SWO12A and SW023 on
November 30, 2015. The laboratory results were received on December 14, 2015.
None of these corresponding analytes were reported at concentrations above permit
benchmarks. Additional stormwater samples were collected in this period and will be
reported under separate cover within 30 days of receiving corresponding final
laboratory reports.
Please direct any correspondence or questions concerning the Marshall Steam Station
NPDES Stormwater Program to Brad Loveland at [phone].
Sincerely,
Rick R. Roper
General Manager Ill
Marshall Steam Station

DUKEEnvironmental Services
ENERGY® Duke Energy
526 South Church Street
Charlotte,NC 28202
Mailing Address:
Mail Code EC13K1 P.O. Box 1006
Charlotte,NC 28201-1006
December 17, 2014
Mr. Bradley Bennett
State of North Carolina
Department of Environment and Natural Resources
Division of Energy, Mineral & Land Resources
Stormwater Permitting Program
1612 Mail Service Center
Raleigh, NC 27699-1612
Subject: Marshall Steam Station
Stormwater Data Submittal
Dear Mr. Bennett:
Please find attached a summary of analytical data collected from stormwater outfalls at the
Marshall Steam Station. Stormwater samples were collected from five outfalls during a rainfall
event on November 17, 2014. Outfall locations are indicated on the site stormwater plan
drawing previously submitted.
Please contact me at [e-mail] or at 980-373-7898 if you have any
questions or need any additional information.
Sincerely,
Mark McGary,iPE
Environmental Services
Attachment ® / y�
6`�EC�a,J E .J
NET .18 2014
DENR-LAND QUALITY
STORPYiWATER PE vilT7iNG

Marshall Steam Station
Stormwater Monitoring Summary
November 2014
Stormwater samples were collected from five stormwater outfalls at the Marshall Steam Station during a
rainfall event on November 17, 2014 as follows:
Date Outfalls Sampled Rainfall Event Rainfall Amount
Duration
November 17, 2014 SWOOIA, 1SW002,SW012A, 575 minutest 0.85 inches#
SW022 and SW023
tThis information was obtained from provisional USGS data(site 353003080591745 CRN-40).
Samples were collected directly into properly preserved bottles and shipped on ice to Duke Energy's
analytical laboratory in Huntersville, NC. Laboratory analyses were conducted by Duke Energy's
Huntersville analytical laboratory (NC Wastewater Certification#248) and Pace Analytical Laboratories (NC
Wastewater Certification# 12).
Analytical parameters for analysis were: TSS,TDS, Oil&Grease,Cl, SO4,F,COD, Al, As, B, Ba, Ca, Cd,
Cu,Cr, Fe, Mn,Mo, Mg, Ni,Pb, Sb, Se,Tl,Zn, Hardness and Hg. Specific conductance, and pH were
measured in the field using calibrated instruments. Laboratory analytical methods used for each parameter
are provided in Appendix A.
Storage and preservation techniques of the samples after collection, and prior to analyses, were followed
according to Appendix B.
Notes:
1 Samples for SW002 were collected from the pipe inlet.
Analytical results are sununarized in Appendix C.

Appendix A
Laboratory Analytical
Methods

Parameter Method Reoortina Units Loh
Limit*
COi) HACH`8000 20 . mg/l Duke Energy
Chloride EPA 300.0 0.1 mg/L Duke Energy
6luorlde EPA 300.0 0.2 mg/L Duke Energy
Sulfate EPA 300.0 1 mg/L Duke Energy
Oil and Grease . EPA 16646 S mg/I. Pace An
Mercury(Hg) EPA 245.1 0.05 µg/L Duke Energy
Aluminum(AI) EPA 200 7 0 005 = fn 91
L : Du�Ce Energy
Barium(Ba) EPA 200.7 0.005 mg/L Duke Energy
h � ra��B) EPA 200 0 05 mg/! Dike Erier�y
Calcium(Ca) EPA 200.7 0.1 mg/L Duke Energy
rHardn :. EPA 2�IQ 7' 01 mgf L(Cai;03) Duke:Energy
Iron(Fe) EPA 200.7 0.01 mg/L Duke Energy
1 Aagne [ill ) EPAQO 7 Q 00 rg/L Duke energy
Manganese(Mn) EPA 200.7 0.005 mg/L Duke Energy
k t
Antimony(Sb) EPA 200.8 1 µg/L Duke Energy
,.. ;. x,..EPA2' 0Z
Cadmium(Cd) EPA 200.8 1 µg/L Duke Energy
,
Copper(Cu) EPA 200.8 1 µg/! Duke Energy
Moly-Yybdenum(�(Mo) EPA 200.8 j11 µg/`LL rDuke Energy
'J._§. TX� �.' f1.� ,.+�'�1'L _%r i,s���sJ�/��y�Q L8'? 'c... i �.•�. .,....t.. ���p�T e . . .. f..a4.,���T3,��irp�►L.c .. ._
Selenium(Se) EPA 200.8 [�y1 µg/L Duke Energy
}A lb
'•'"tie -tl�_k` )4� /�-��.,,I Ck. - ._�-�.. . 1 .1. S. ��...+.k 1 ,... _ 1��2�T-,, '
MS 5M2540C 25 mg/L Duke Energy
<r
r!•' ��'' .z �. .. ?. ' :. ��w , ...ram t.• -k5 ' .+-_ tn$��•rA� ...: .:°._L.s-.`DirTL�.'.w"Ae�SI!,,_
*Reporting limits are nominal;values are higher if sample dilution was required.

Appendix B
Sample Preservation and Hold Times

Parameter name Container' Preservation" Maximum holding
time°
Tab1o:I13--4norgaglc Tests,
1.Acidity P,FP,G Cool,s6°C1e 14 days.
2:Alkaliolt...• . F;FP,G :.. Cool,46'C,e 14 dajrs.
4.Ammonia P,FP,G Cool,s6°C'B,H2SO4 to pH<2 28 days.
9.B[ocheriucal oxygen demand P,FP,G Cool;s6°C'B c,Q8,hours.
10.Boron P,FP,or Quartz HNO3 to pH<2 6 months.
11 Bro tide, P,FP,G Norte required 28 days, _
14 Biochemical oxygen demand,carbonaceous P.FP G Cool,s6°C'B 48 hours.
15 Chemiical;oxygen demand;= P.FPP,G Cool.s6:°C18,H2S0,to pH":9 28 days:
16 Chloride P,FP,G None required 28 days.
17 cti[onne,total residual P;G.' None required : Ariaiyze-within 15
... _ :!r!inittes
21.Color P,FP,G Cool,s6'C'8 48 hours.
23.24.Cya+tide,total or ayadable,(or CATC)and free P;FP,G Cool,sf3°C'�.NaOH to pH>10. 14 ddys.
tedttc(fig-ant�f oxidizer
PCe_s ,t
25 Fluoride P None required 28 days
N6NQ6-.or HA04 to pH 9dEhs.
28.Hydrogen ion(pH) P,FP,G None required Analyze within 15
o ,e
minutes.
P;FP, Goo',s6 C. :LiiSQ�to'pH .: ' - 2$ ►+s...
r 1.Qel, h s'ydorganlc.lyy _..
Table IB--Metals:
$"'AM'a?F
35.Mercury(CVAA) P.FP G HNO3 to pH<2 28 days
35�?Mu 17ri�C k ; Fri Eid ' FP t 5 mi/L`12N F{GI or 5 itt BrCI'r EYs v r
3,54,12,13,19,20,22,26,29,30,32-34,36,37,45, P.FP,G HNO3 to pH<2,or at least 24 6 months.
47,51,52,58.60,62,63,70-72,74,75.Metals,except hours prior to analysis'B
boron,chromium VI,and mercury
48 hours
39.Nitrate-nitrite P.FP,G Cool s6°Cir F6SO4 to pH<2 28 days
-4 N�frlter� P FP.G:: :::CSool st3°C,g 48 hours
41.Oil and grease G Cool to"-- °Cte,HCI or H2SO4 to 28 days.
pH<2
42;QF CarboD Pr FP,G Cool to, °C';HCI,HrSO�,or 28 dgys
44.Orthophosphate P,FP,G Cool,to s6 C Filter withir►15 minutes;
Analyze within 48
hours.
4 Qxy9art',Rh§saved,Q�a b[e G,.84ttte aid fpp, Norte res�u[red A 7n1atyjz [f 15
47.Winlder G.63 @e and top_ Fix on site and store in dark 8 hours.
.—.1.
°G' Ox.tQ'i
49.Phosphorous(elemental) G Cool s6°CtB 48 hours.
E _lzSQ4ta
53.Residue,total P,FP G Cool s6°C18 7 days
R;F §+i ;1�ltireia4�le Pc
55.Residue,Nonfilterable(TSS) P FP G Cool 56°Cte 7 days
. YPr' d2i�' . '._ y G+'p�,i:�oC+la �' [S. `.
57.Residue,Volatile P,FP G Cool 5B°C'B 7 days.
CQaI.56°Cie ... . . . 2$, r<:
64.Specific conductance P FP G Cool 56°Ce 28 days
„
.:. ...._..- F,:-a+r2.: :040{.SB
66.Sulfide P,FP,G Cool,s6°CiD,add zinc acetate 7 days.
pp lus sodium hydroxide to pH>9
97 S�lte ,r R,FP, IYOC�e Uirati _z ASl/ yze wIt11R 15
68.Surfactants FP,G Cool,S6bCie.. __ 48 hours.
nsteau1j(9 _analyze
73.Turbidity P,FP,G Cool,56°C'd 48 hours.
'"P"is for polyethylene; "FP"is fluoropolymer(polytetrafluoroethylene(PTFE);Teflon®), or other fluoropolymer, unless stated otherwise
in this Table 11; "G"is glass; "PA"is any plastic that is made of a sterilizable material (polypropylene or other autoclavable plastic); "LDPE"is
low density polyethylene.
2Except where noted in this Table II and the method for the parameter,preserve each grab sample within 15 minutes of collection.For a
composite sample collected with an automated sample(e.g., using a 24-hour composite sample;see 40 CFR 122.21(g)(7)(i)or 40 CFR Part
403, Appendix E), refrigerate the sample at :56 °C during collection unless specified otherwise in this Table 11 or in the method(s). For a
composite sample to be split into separate aliquots for preservation and/or analysis,maintain the sample at s6°C, unless specified otherwise
in this Table 11 or in the method(s), until collection,splitting,and preservation is completed.Add the preservative to the sample container prior
to sample collection when the preservative will not compromise the integrity of a grab sample, a composite sample, or aliquot split from a

composite sample within 15 minutes of collection. If a composite measurement is required but a composite sample would compromise sample
integrity,individual grab samples must be collected at prescribed time intervals(e.g.,4 samples over the course of a day,at 6-hour intervals).
Grab samples must be analyzed separately and the concentrations averaged. Alternatively, grab samples may be collected in the field and
composited in the laboratory if the compositing procedure produces results equivalent to results produced by arithmetic averaging of results of
analysis of individual grab samples. For examples of laboratory compositing procedures, see EPA Method 1664 Rev.A (oil and grease)and
the procedures at 40 CFR 141.34(f)(14)(iv)and(v)(volatile organics).
'When any sample is to be shipped by common carrier or sent via the U.S. Postal Service, it must comply with the Department of
Transportation Hazardous Materials Regulations (49 CFR part 172). The person offering such material for transportation is responsible for
ensuring such compliance. For the preservation requirement of Table 11, the Office of Hazardous Materials, Materials Transportation Bureau,
Department of Transportation has determined that the Hazardous Materials Regulations do not apply to the following materials: Hydrochloric
acid(HCI) in water solutions at concentrations of 0.04%by weight or less (pH about 1.96 or greater, Nitric acid(HNO3) in water solutions at
concentrations of 0.15%by weight or less(pH about 1.62 or greater); Sulfuric acid(H2SO4)in water solutions at concentrations of 0.35%by
weight or less(pH about 1.15 or greater);and Sodium hydroxide(NaOH)in water solutions at concentrations of 0.080°k by weight or less(pH
about 12.30 or less).
SSamples should be analyzed as soon as possible after collection. The times listed are the maximum times that samples may be held
before the start of analysis and still be considered valid. Samples may be held for longer periods only if the permittee or monitoring laboratory
has data on file to show that,for the specific types of samples under study, the analytes are stable for the longer time,and has received a
variance from the Regional Administrator under Sec. 136.3(e). For a grab sample, the holding time begins at the time of collection. For a
composite sample collected with an automated sampler(e.g.,using a 24-hour composite sampler;see 40 CFR 122.21(g)(7)(i)or 40 CFR part
403.Appendix E),the holding time begins at the time of the end of collection of the composite sample.For a set of grab samples composited
in the field or laboratory,the holding time begins at the time of collection of the last grab sample in the set. Some samples may not be stable
for the maximum time period given in the table. A permittee or monitoring laboratory is obligated to hold the sample for a shorter time if it
knows that a shorter time is necessary to maintain sample stability. See 136.3(e)for details. The date and time of collection of an individual
grab sample is the date and time at which the sample is collected. For a set of grab samples to be composited,and that are all collected on
the same calendar date,the date of collection is the date on which the samples are collected.For a set of grab samples to be composited, and
that are collected across two calendar dates, the date of collection is the dates of the two days; e.g., November 14-15. For a composite
sample collected automatically on a given date, the date of collection is the date on which the sample is collected. For a composite sample
collected automatically,and that is collected across two calendar dates,the date of collection is the dates of the two days;e.g.,November 14-
15. For static-renewal toxicity tests, each grab or composite sample may also be used to prepare test solutions for renewal at 24 h, 48 h,
and/or 72 h after first use,if stored at 0-6°C,with minimum head space.
5ASTM D7365-09a specifies treatment options for samples containing oxidants (e.g., chlorine). Also, Section 9060A of Standard
Methods for the Examination of Water and Wastewater(20th and 21st editions)addresses dechlorination procedures.
"Sampling,preservation and mitigating interferences in water samples for analysis of cyanide are described in ASTM D7365-09a.There
may be interferences that are not mitigated by the analytical test methods or D7365-09a. Any technique for removal or suppression of
interference may be employed, provided the laboratory demonstrates that it more accurately measures cyanide through quality control
measures described in the analytical test method. Any removal or suppression technique not described in D7365-09a or the analytical test
method must be documented along with supporting data.
7For dissolved metals, filter grab samples within 15 minutes of collection and before adding preservatives. For a composite sample
collected with an automated sampler(e.g.,using a 24-hour composite sampler,see 40 CFR 122.21(g)(7)(i)or 40 CFR Part 403,Appendix E),
filter the sample within 15 minutes after completion of collection and before adding preservatives. If it is known or suspected that dissolved
sample integrity will be compromised during collection of a composite sample collected automatically over time(e.g.,by interchange of a metal
between dissolved and suspended forms), collect and filter grab samples to be composited (footnote 2) in place of a composite sample
collected automatically.
"Guidance applies to samples to be analyzed by GC,LC,or GC/MS for specific compounds.
91f the sample is not adjusted to pH 2,then the sample must be analyzed within seven days of sampling.
'"The pH adjustment is not required if acrolein will not be measured.Samples for acrolein receiving no pH adjustment must be analyzed
within 3 days of sampling.
"When the extractable analytes of concern fall within a single chemical category, the specified preservative and maximum holding
times should be observed for optimum safeguard of sample integrity(i.e.,use all necessary preservatives and hold for the shortest time listed).
When the analytes of concern fall within two or more chemical categories,the sample may be preserved by cooling to s6°C,reducing residual
chlorine with 0.008% sodium thiosulfate, storing in the dark, and adjusting the pH to 6-9; samples preserved in this manner may be held for
seven days before extraction and for forty days after extraction.Exceptions to this optional preservation and holding time procedure are noted
in footnote 5(regarding the requirement for thiosulfate reduction),and footnotes 12, 13(regarding the analysis of benzidine).
121f 1,2-dipheny[hydrazine is likely to be present,adjust the pH of the sample to 4.0 t0.2 to prevent rearrangement to benzidine.
13Extracts may be stored up to 30 days at<0 DC.
"For the analysis of diphenylnitrosamine,add 0.008%Na2S2O3 and adjust pH to 7-10 with NaOH within 24 hours of sampling.
'SThe pH adjustment may be performed upon receipt at the laboratory and may be omitted if the samples are extracted within 72 hours
of collection.For the analysis of aldrin,add 0.008°/,Na2.S2O3.
'"Place sufficient ice with the samples in the shipping container to ensure that ice is still present when the samples arrive at the
laboratory. However, even if ice is present when the samples arrive, immediately measure the temperature of the samples and confine that
the preservation temperature maximum has not been exceeded. In the isolated cases where it can be documented that this holding
temperature cannot be met, the permittee can be given the option of on-site testing or can request a variance. The request for a variance
should include supportive data which show that the toxicity of the effluent samples is not reduced because of the increased holding
temperature.Aqueous samples must not be frozen. Hand-delivered samples used on the day of collection do not need to be cooled to 0 to 6
°C prior to test initiation.
'Samples collected for the determination of trace level mercury (<100 ng/L) using EPA Method 1631 must be collected in tightly-
capped fluoropolymer or glass bottles and preserved with BrCI or HCI solution within 48 hours of sample collection.The time to preservation
may be extended to 28 days if a sample is oxidized in the sample bottle. A sample collected for dissolved trace level mercury should be
filtered in the laboratory within 24 hours of the time of collection. However, if circumstances preclude overnight shipment, the sample should
be filtered in a designated clean area in the field in accordance with procedures given in Method 1669. If sample integrity will not be
maintained by shipment to and filtration in the laboratory, the sample must be filtered in a designated clean area in the field within the time

period necessary to maintain sample integrity. A sample that has been collected for determination of total or dissolved trace
level mercury must be analyzed within 90 days of sample collection.
18Aqueous samples must be preserved at s6`C,and should not be frozen unless data demonstrating that sample freezing
does not adversely impact sample integrity is maintained on file and accepted as valid by the regulatory authority. Also, for
purposes of NPDES monitoring, the specification of "s°C" is used in place of the "4 °C" and "<4 °C" sample temperature
requirements listed in some methods. It is
not necessary to measure the sample temperature to three significant figures (1/100th of 1 degree); rather, three significant
figures are
specified so that rounding down to 6°C may not be used to meet the s6'C requirement. The preservation temperature does
not apply to samples that are analyzed immediately(less than 15 minutes).
19An aqueous sample may be collected and shipped without acid preservation. However, acid must be added at least 24
hours before analysis to dissolve any metals that adsorb to the container walls. If the sample must be analyzed within 24 hours of
collection, add the acid immediately (see footnote 2). Soil and sediment samples do not need to be preserved with acid. The
allowances in this footnote supersede the
preservation and holding time requirements in the approved metals methods.
20To achieve the 28-day holding time, use the ammonium sulfate buffer solution specified in EPA Method 218.6. The
allowance in this footnote supersedes preservation and holding time requirements in the approved hexavalent chromium
methods, unless this supersession
would compromise the measurement,in which case requirements in the method must be followed.
2'Holding time is calculated from time of sample collection to elution for samples shipped to the laboratory in bulk and
calculated from the time of sample filtration to elution for samples filtered in the field.
Sample analysis should begin as soon as possible after receipt;sample incubation must be started no later than 8 hours
from time of
collection.
23For fecal coliform samples for sewage sludge(biosolids)only, the holding time is extended to 24 hours for the following
sample types using either EPA Method 1680(LTB-EC) or 1681 (A-1): Class A composted, Class B aerobically digested, and
Class B anaerobically digested.
24The immediate filtration requirement in orthophosphate measurement is to assess the dissolved or bio-available form of
orthophosphorus (i.e., that which passes through a 0.45-micron filter), hence the requirement to filter the sample immediately
upon collection
(i.e.,within 15 minutes of collection).
[38 FR 28758,Oct. 16, 1973

Appendix C
Analytical Data Summary

Parameter Units Sample Locations
SWO01A SW002 SW012A SW022 SW023
COD mg/L < 20 < 20 47 < 20 22
Cl-Chloride(00940) mg/L 1.3 IS 4.3 < 0.5 1.4
Fluoride mg/L < 0.1 0.14 < 1 < 0.5 0.15
SO4-Sulfate(00945) mg/L 24 28 580 190 34
_ Oil&Grease mg/L < 5 < 5 < 5 < 5 < 5.0
Hg-Mercury(71900) µg/L < 0.05 < 0.05 0.23 < 0.05 < 0.05
Al-Aluminum(01105) mg/L 1.62 0.744 8.47 4.39 0.967
Ba-Barium(01007) mg/L 0.026 0.03 0.128 0.064 0.036
B-Boron(01022) mg/L < 0.05 < 0.05 0.093 < 0.05 < 0.05
Ca-Calcium mg/L 12.3 12.9 261 89 13.8
Hardness mg/L(CaCO3) 35.4 37.7 673 232 40.3
Fe-Iron(02045) mg/L 1.77 1 - 10.8 5.72 1.27
Mg-Magnesium mg/L 1.15 1.33 5.18 2.36 1.41
Mn-Manganese(01055) mg/L 0.025 0.019 0.322 0.122 0.042
Zn-Zinc(01092) mg/L 0.007 0.015 0.057 0.072 0.02
Sb-Antimony(01097) µg/L < 1 < 1 1.02 < 1 < 1
As-Arsenic(01002) µg/L 1.14 1.03 4.66 2.03 1.08
Cd-Cadmium(01027) µg/L < 1 < 1 < 1 < 1 < 1
Cr-Chromium(01034) µg/L 1.21 < 1 16.3 ? 4.83 6.73
Cu-Copper(01042) µg/L 3.76 3.55 20.6 6.78 5.87
Pb-Lead(01051) µg/L 1.42 < 1 4.14 2.38 < 1
Mo-Molybdenum µg/L 2.23 3.16 7.06 < 1 1.35
Ni-Nickel(01067) µg/L < 1 < 1 13.1 2.64 1.08
Se-Selenium (01147) µg/L < 1 1.07 27.2 2.48 3
TI-Thallium(01059) µg/L < 0.2 < 0.2 0.208 < 0.2 < 0.2
pH SI Units 7.28 6.98 7.56 7.01 7.06
Specific conductance vs/cm 85.7 108 1031 421 108
MS-Total Diss.Solids(70300) mg/L 76 78 1 980 1 260 1 80
Temperature °C 11.9 11.5 10.3 10.0 9.6
TSS-Total Suspended Solids mg/L 25 21 150 230 17
1 Samples were collected from the pipe inlet

DUKE Environmental Services
ENERGY. Duke Energy
526 South Church Street
Charlotte, NC 28202
Mailing Address:
Mail Code EC13K/P.O. Box 1006
Charlotte, NC 28201-1006
October 22, 2014
Mr. Bradley Bennett
State of North Carolina
Department of Environment and Natural Resources
Division of Energy, Mineral & Land Resources
Stormwater Permitting Program
1612 Mail Service Center RECEIVED
Raleigh, NC 27699-1612
OCT 2" 2014
DcNR-LAlJa QUALITY
Subject. Marshall Steam Station STORftA%ATER FERtilITTING
Stormwater Data Submittal
Dear Mr. Bennett:
Please find attached a summary of limited analytical data collected from stormwater outfalls at
the Marshall Steam Station.
The accompanying analytical data was collected on September 29, 2014, and is representative
of stormwater conveyed by Outfalls SWO07 and SWO12. Outfall locations are indicated on the
site stormwater plan drawing previously submitted. Actual sampling locations are described in
the attached summary.
Please contact me at [e-mail] or at 980-373-7898 if you have any
questions or need any additional information.
Sincerely,
Mark McGary, PE
Environmental Services
Attachment

Marshall Steam Station
Stormwater Monitoring Summary
September 2014
Stormwater samples were collected from two stormwater outfalls at Marshall Steam Station during a storm
event on September 29, 2014. The rainfall event was approximately 240 minutes in duration and measured
approximately 0.19 inches of precipitation. The previous rain event was greater than 72 hours prior.
Samples collected are representative of stormwater conveyed by Outfalls SW007 and SW012. The actual
outfalls at these locations are inaccessible. Samples were collected from the first accessible up-gradient
catch basins associated with each outfall. Sampling locations and estimated flow rates are summarized in the
following table:
Sample Date Inferred Outfall Outfall Accessibility and Actual Sampling Location
Sampled
September 29, 2014 SW007 Outfall is submerged; sample was collected from the first
accessible up-gradient manhole.
September 29, 2014 SW012 Outfall is elevated and was accessible only by boat;
sample was collected from the pipe inlet.
Samples were collected directly into properly preserved bottles and shipped on ice to Duke Energy's
analytical laboratory in Huntersville, NC. Laboratory analyses were conducted by Duke Energy's
Huntersville analytical laboratory (NC Wastewater Certification#248) and Pace Analytical Laboratories (NC
Wastewater Certification# 12).
Analytical parameters for analysis were: TSS,TDS, Oil &Grease, Cl, SOa, F, COD, Al, As, B, Ba, Ca,Cd,
Cu,Cr,Fe, Mn,Mo, Mg, Ni, Pb, Sb, Se,T1,Zn, Hardness and Hg. Specific conductance,and pH were
measured in the field using calibrated instruments. Laboratory analytical methods used for each parameter
are provided in Appendix A.
Storage and preservation techniques of the samples after collection, and prior to analyses, were followed
according to Appendix B.
Analytical results are summarized in Appendix C.

Appendix A
Laboratory Analytical Methods

Parameter Method Reporting Units Lab
Limit*
COD HACH 8000 20 mg/L Duke Energy
Chloride EPA 300.0 0.1 mg/L Duke Energy
Fluoride EPA 300.0 0.1 mg/L Duke Energy
Sulfate EPA 300.0 1 mg/L Duke Energy
oil and Grease EPA 1664B 5 mg/L Pace Analytical
Mercury(Hg) EPA 245.1 0.05 µg/L Duke Energy
Aluminum(Al) EPA 200.7 0.005 mg/L Duke Energy
Barium(Ba) EPA 200.7 0.005 mg/L Duke Energy
Boron(B) EPA 200.7 0.05 mg/L Duke Energy
Calcium(Ca) EPA 200.7 0.1 mg/L Duke Energy
Hardness EPA 200.7 0.19 mg/L(CaCO3) Duke Energy
Iron(Fe) EPA 200.7 0,01 mg/L Duke Energy
Magnesium(Mg) EPA 200.7 0.005 mg/L Duke Energy
Manganese(Mn) EPA 200.7 0.005 mg/L Duke Energy
Zinc(Zn) EPA 200.7 0.005 mg/L Duke Energy
Antimony(Sb) EPA 200.8 1 µg/L Duke Energy
Arsenic(As) EPA 200.8 1 µg/L Duke Energy
Cadmium(Cd) EPA 200.8 1 µg/L Duke Energy
Chromium(Cr) EPA 200.8 1 µg/L Duke Energy
Copper(Cu) EPA 200.8 1 µg/L Duke Energy
Lead(Pb) EPA 200.8 1 µg/L Duke Energy
Molybdenum(Mo) EPA 200.8 1 µg/L Duke Energy
Nickel(Ni) EPA 200.8 1 µg/L Duke Energy
Selenium(Se) EPA 200.8 1 µg/L Duke Energy
Thallium(TI) Low Level EPA 200.9 0.2 µg/L Duke Energy
TDS SM2540C 25 rng/L Duke Energy
TS5 5M2540D 5 mg/L Duke Energy
*: Reporting limits are nominal; values are higher if sample dilution was required.

Appendix B
Sample Preservation
and Hold Times

Parameter name Container' Preservation23 Maximum holding
time'
Table IB—Inorganic Tests:
1.,acidity P. FP,G Cool, 56°C" 14 days.
2.Alkalinity P,FP,G Cool,s6 9C'8 14 days.
4.Ammonia P, FP, G Cool,s6°C'', H,SO,to pH<2 28 days.
9.Biochemical oxygen demand P,FP, G Cool,s6°C'B 48 hours.
10. Boron P,FP,or Quartz HNO3 to pH<2 6 months.
11. Bromide P,FP,G None required 28 days.
14. Biochemical oxygen demand,carbonaceous P,FP G Cool,sfi°C1' 48 hours.
15.Chemical oxygen demand P, FP,G Cool,<_6°C'', HzSO,to pH<2 28 days.
16.Chloride P, FP,G None required 28 days.
17.Chlorine,total residual P,G None required Analyze within 15
minutes.
21. Color P, FP,G Cool,s6°C'B 48 hours.
23-24.Cyanide,total or available(or CATC)and free P, FP,G Cool,<6°C'B, NaOH to pH>105 14 days.
6, reducing agent if oxidizer
present
25. Fluoride P None required 28 days.
27. Hardness P, FP,G HNO3 or H2SO4 to pH<2 6 months.
28. Hydrogen ion(pH) P, FP,G None required Analyze within 15
minutes.
31,43. Kjeldahl and organic N P. FP,G Cool, s6°C'B,HTSO,to pH<2 28 days.
Table IB—Metals:'
18.Chromium VI P, FP,G Cool, s6°C", pH=9.3.9.7ZB 28 days.
35.Mercury(CVAA) P, FP,G HNO2 to pH<2 28 days.
35.Mercury(CVAFS) FP,G;and FP- 5 mUL 12N HCI or 5 mUL BrCI" 90 days."
lined cap"
3,5-8,12,13,19,20,22,26,29,30,32-34,36,37,45, P, FP,G HNO3 to pH<2,or at least 24 6 months.
47,51,52,58-60,62,63,70-72,74,75,Metals,except hours prior to analysis75
boron,chromium VI,and mercury
38.Nitrate P, FP,G Cool,<_6°C'B 48 hours.
39.Nitrate-nitrite P, FP,G Cool,<_6°C'B, H2SO,to pH<2 28 days.
40.Nitrite P, FP,G Cool,s6°C'B 48 hours.
41.Oil and grease G Cool to<_6°C'B,HCl or H2S0.,10 28 days.
PH<2
42. Organic Carbon P, FP,G Cool to<6 IC"',HCI,H2SO4,or 28 days.
H3P0,to pH<2
44.Orthophosphate P,FP,G Cool,to s6°C"' Filter within 15 minutes;
Analyze within 48
hours.
46,Oxygen, Dissolved Probe G, Bottle and top None required Analyze within 15
minutes.
47.Winkler G, Bottle and top Fix on site and store in dark 8 hours.
48. Phenols G Cool,s6 5", H2SO,to pH<2 28 days.
49. Phosphorous(elemental) G Cool, 56°C'B 48 hours.
50. Phosphorous,total P. FP,G Cool,s6°C'",H2SO4 to pH<2 28 days.
53.Residue,total P. FP,G Cool, <-6°C'B 7 days.
54.Residue,Filterable P. FP,G Cool,56°C'B 7 days.
55.Residue, Nonfilterable(TSS) P,FP,G Cool,s6°C'B 7 days.
56.Residue,Settleable P,FP,G Cool,sfi°C'B 48 hours.
57. Residue,Volatile P,FP,G Cool,<-6°C'B 7 days.
61.Silica P or Quartz Coal,s6°C'B 28 days.
64.Specific conductance P, FP,G Cool,s6°C'B 28 days.
65.Sulfate P, FP,G Cool,:56°C'B 28 days.
66.Sulfide P, FP,G Cool,<6°C'B,add zinc acetate 7 days.
plus sodium hydroxide to pH>9
67.Sulfite P, FP,G None required Analyze within 15
minutes.
68.Surfactants P, FP,G Cool,<-6°C'B 48 hours.
69.Temperature P,FP,G None required Analyze.
73.Turbidity P, FP, G Cool,s6°C'' 48 hours.
'"P" is for polyethylene; "FP"is fluoropolymer(polytetrafluoroethylene (PTFE); Teflon"=), or other fluoropolymer, unless stated otherwise
in this Table II; "G" is glass; "PA"is any plastic that is made of a sterilizable material (polypropylene or other autoclavable plastic); "LDPE"is
low density polyethylene.
2Exoept where noted in this Table II and the method for the parameter,preserve each grab sample within 15 minutes of collection. For a
composite sample collected with an automated sample(e.g., using a 24-hour composite sample; see 40 CFR 122.21(g)(7)(i)or 40 CFR Part
403, Appendix E), refrigerate the sample at s6 °C during collection unless specified otherwise in this Table II or in the method(s). For a
composite sample to be split into separate aliquots for preservation and/or analysis, maintain the sample at s6'C, unless specified otherwise
in this Table II or in the method(s), until collection, splitting, and preservation is completed.Add the preservative to the sample container prior
to sample collection when the preservative will not compromise the integrity of a grab sample, a composite sample, or aliquot split from a

composite sample within 15 minutes of collection. If a composite measurement is required but a composite sample would compromise sample
integrity, individual grab samples must be collected at prescribed time intervals(e.g.,4 samples over the course of a day, at 6-hour intervals).
Grab samples must be analyzed separately and the concentrations averaged. Alternatively, grab samples may be collected in the field and
composited in the laboratory if the compositing procedure produces results equivalent to results produced by arithmetic averaging of results of
analysis of individual grab samples. For examples of laboratory compositing procedures, see EPA Method 1664 Rev.A(oil and grease)and
the procedures at 40 CFR 141.34(f)(14)(iv)and(v)(volatile organics).
81When any sample is to be shipped by common carrier or sent via the U.S. Postal Service, it must comply with the Department of
Transportation Hazardous Materials Regulations (49 CFR part 172). The person offering such material for transportation is responsible for
ensuring such compliance. For the preservation requirement of Table II, the Office of Hazardous Materials, Materials Transportation Bureau,
Department of Transportation has determined that the Hazardous Materials Regulations do not apply to the following materials: Hydrochloric
acid (HCI)in water solutions at concentrations of 0.04% by weight or less (pH about 1.96 or greater, Nitric acid(HNO3) in water solutions at
concentrations of 0.150%by weight or less (pH about 1.62 or greater); Sulfuric acid(H2SO4)in water solutions at concentrations of 0.35% by
weight or less(pH about 1.15 or greater);and Sodium hydroxide(NaOH)in water solutions at concentrations of 0.080%by weight or less(pH
about 12.30 or less).
4Samples should be analyzed as soon as possible after collection. The times listed are the maximum times that samples may be held
before the start of analysis and still be considered valid.Samples may be held for longer periods only if the permittee or monitoring laboratory
has data on file to show that,for the specific types of samples under study, the analytes are stable for the longer time, and has received a
variance from the Regional Administrator under Sec. 136.3(e). For a grab sample, the holding time begins at the time of collection. For a
composite sample collected with an automated sampler(e.g.,using a 24-hour composite sampler,see 40 CFR 122.21(g)(7)(i)or 40 CFR part
403, Appendix E),the holding time begins at the time of the end of collection of the composite sample. For a set of grab samples composited
in the field or laboratory, the holding time begins at the time of collection of the last grab sample in the set. Some samples may not be stable
for the maximum time period given in the table. A permittee or monitoring laboratory is obligated to hold the sample for a shorter time if it
knows that a shorter time is necessary to maintain sample stability.See 136.3(e)for details. The date and time of collection of an individual
grab sample is the date and time at which the sample is collected. For a set of grab samples to be composited, and that are all collected on
the same calendar date,the date of collection is the date on which the samples are collected. For a set of grab samples to be composited,and
that are collected across two calendar dates, the date of collection is the dates of the two days; e.g., November 14-15. For a composite
sample collected automatically on a given date, the date of collection is the date on which the sample is collected. For a composite sample
collected automatically,and that is collected across two calendar dates,the date of collection is the dates of the two days;e.g., November 14-
15. For static-renewal toxicity tests, each grab or composite sample may also be used to prepare test solutions for renewal at 24 h, 48 h,
and/or 72 h after first use,if stored at 0-6°C,with minimum head space.
5ASTM D7365-09a specifies treatment options for samples containing oxidants (e.g., chlorine). Also, Section 9060A of Standard
Methods for the Examination of Water and Wastewater(20th and 21st editions)addresses dechlorination procedures.
6Sampling,preservation and mitigating interferences in water samples for analysis of cyanide are described in ASTM D7365-09a.There
may be interferences that are not mitigated by the analytical test methods or D7365-09a. Any technique for removal or suppression of
interference may be employed, provided the laboratory demonstrates that it more accurately measures cyanide through quality control
measures described in the analytical test method. Any removal or suppression technique not described in D7365-09a or the analytical test
method must be documented along with supporting data.
7For dissolved metals, filter grab samples within 15 minutes of collection and before adding preservatives. For a composite sample
collected with an automated sampler(e.g., using a 24-hour composite sampler,see 40 CFR 122.21(g)(7)(i)or 40 CFR Part 403,Appendix E),
filter the sample within 15 minutes after completion of collection and before adding preservatives. If it is known or suspected that dissolved
sample integrity will be compromised during collection of a composite sample collected automatically over time(e.g.,by interchange of a metal
between dissolved and suspended forms), collect and filter grab samples to be composited (footnote 2) in place of a composite sample
collected automatically.
8Guidance applies to samples to be analyzed by GC,LC,or GC/MS for specific compounds.
elf the sample is not adjusted to pH 2,then the sample must be analyzed within seven days of sampling.
tOThe pH adjustment is not required if acrolein will not be measured.Samples for acrolein receiving no pH adjustment must be analyzed
within 3 days of sampling.
"When the extractable analytes of concern fall within a single chemical category, the specified preservative and maximum holding
times should be observed for optimum safeguard of sample integrity(i.e.,use all necessary preservatives and hold for the shortest time listed).
When the analytes of concern fall within two or more chemical categories,the sample may be preserved by cooling to s6°C,reducing residual
chlorine with 0.008% sodium thiosulfate, storing in the dark, and adjusting the pH to 6-9; samples preserved in this manner may be held for
seven days before extraction and for forty days after extraction.Exceptions to this optional preservation and holding time procedure are noted
in footnote 5(regarding the requirement for thiosulfate reduction),and footnotes 12, 13(regarding the analysis of benzidine).
721f 1,2-diphenylhydrazine is likely to be present,adjust the pH of the sample to 4.0 t0.2 to prevent rearrangement to benzidine.
13Extracts may be stored up to 30 days at<0'C.
14For the analysis of diphenyinitrosamine,add 0.008%Na2S2O3 and adjust pH to 7-10 with NaOH within 24 hours of sampling.
'-The pH adjustment may be performed upon receipt at the laboratory and may be omitted if the samples are extracted within 72 hours
of collection.For the analysis of aldrin,add 0.008%Na2S2O3
1BPlace sufficient ice with the samples in the shipping container to ensure that ice is still present when the samples arrive at the
laboratory. However, even if ice is present when the samples arrive, immediately measure the temperature of the samples and confirm that
the preservation temperature maximum has not been exceeded. In the isolated cases where it can be documented that this holding
temperature cannot be met, the permittee can be given the option of on-site testing or can request a variance. The request for a variance
should include supportive data which show that the toxicity of the effluent samples is not reduced because of the increased holding
temperature.Aqueous samples must not be frozen. Hand-delivered samples used on the day of collection do not need to be cooled to 0 to 6
°C prior to test initiation.
"Samples collected for the determination of trace level mercury (<100 ng/L) using EPA Method 1631 must be collected in tightly-
capped fluoropolymer or glass bottles and preserved with BrCI or HCI solution within 48 hours of sample collection.The time to preservation
may be extended to 28 days if a sample is oxidized in the sample bottle. A sample collected for dissolved trace level mercury should be
filtered in the laboratory within 24 hours of the time of collection. However, if circumstances preclude overnight shipment,the sample should
be filtered in a designated clean area in the field in accordance with procedures given in Method 1669. If sample integrity will not be
maintained by shipment to and filtration in the laboratory, the sample must be filtered in a designated clean area in the field within the time

period necessary to maintain sample integrity. A sample that has been collected for determination of total or dissolved trace
level mercury must be analyzed within 90 days of sample collection.
"Aqueous samples must be preserved at s6°C,and should not be frozen unless data demonstrating that sample freezing
does not adversely impact sample integrity is maintained on file and accepted as valid by the regulatory authority. Also, for
purposes of NPDES monitoring, the specification of "s°C" is used in place of the "4 °C' and "<4 °C" sample temperature
requirements listed in some methods.It is
not necessary to measure the sample temperature to three significant figures (1/100th of 1 degree); rather, three significant
figures are
specified so that rounding down to 6°C may not be used to meet the s6°C requirement. The preservation temperature does
not apply to samples that are analyzed immediately(less than 15 minutes)-
"An aqueous sample may be collected and shipped without acid preservation. However, acid must be added at least 24
hours before analysis to dissolve any metals that adsorb to the container walls.If the sample must be analyzed within 24 hours of
collection, add the acid immediately (see footnote 2). Soil and sediment samples do not need to be preserved with acid. The
allowances in this footnote supersede the
preservation and holding time requirements in the approved metals methods.
2OTo achieve the 28-day holding time, use the ammonium sulfate buffer solution specified in EPA Method 218.6. The
allowance in this footnote supersedes preservation and holding time requirements in the approved hexavalent chromium
methods, unless this supersession
would compromise the measurement,in which case requirements in the method must be followed.
2tHolding time is calculated from time of sample collection to elution for samples shipped to the laboratory in bulk and
calculated from the time of sample filtration to elution for samples filtered in the field.
22Sample analysis should begin as soon as possible after receipt;sample incubation must be started no later than 8 hours
from time of
collection.
23For fecal coliform samples for sewage sludge(biosolids)only,the holding time is extended to 24 hours for the following
sample types using either EPA Method 1680 (LTB-EC) or 1681 (A-1): Class A composted, Class B aerobically digested, and
Class B anaerobically digested.
24The immediate filtration requirement in orthophosphate measurement is to assess the dissolved or bio-available form of
orthophosphorus (i.e., that which passes through a 0.45-micron filter), hence the requirement to filter the sample immediately
upon collection
(i.e.,within 15 minutes of collection).
[38 FR 28758,Oct.16, 1973

Appendix C
Analytical Data Summary

Parameter Units Sample Location
SW007 SW012
COD mg/L 26 < 20
Cl-Chloride(00940) mg/L 1.3 6.8
Fluoride mg/L 0.68 0.45
SO4-Sulfate(00945) mg/L 64 220
Oil&Grease mg/L < 5 < 5
Hg-Mercury(71900) µg/L < 1 < 0.05
AI-Aluminum(01105) mg/L 35 0.941
Ba-Barium(01007) mg/L 0.469 0.042
B-Boron(01022) mg/L 0.181 0.064
Ca-Calcium mg/L 52.6 103
Hardness mg/L(CaCO3) 187 262
Fe-Iron(01045) mg/L 54.9 0.896
Mg-Magnesium mg/L 13.5 1.32
Mn-Manganese(01055) mg/L 0.748 0.016
Zn-Zinc(01092) mg/L 0.91 0.075
Sb-Antimony(01097) µg/L 1.4 1.11
As-Arsenic(01002) µg/L 32.2 1.06
Cd-Cadmium(01027) µg/L 1.42 < 1
Cr-Chromium(01034) µg/L 60.3 1.53
Cu-Copper(01042) µg/L 96.3 4.79
Pb-Lead(01051) µg/L 48.5 < 1
Molybdenum(Mo) µg/L 10.9 2.74
Ni-Nickel(01067) µg/L 52.8 1.4
Se-Selenium(01147) µg/L 19.6 6.76
TI-Thallium(01059) µg/L 1.08 0.426
pH SI Units 7.75 7.71
Specific conductance VS/Cm 224 428
TDS-Total Diss.Solids(70300) mg/L 290 370
Temperature °C -- --
TSS-Total Suspended Solids mg/L 1100 27
(Vote:temperatures were not taken during the sampling event.