NCS000548_Renewal Application_20251002 (2)

Duke Energy
DUKE 8rr29 allFast
step I wy Station
8329 Fast NC E[wy 15U
ENERGY.. Terre[l,NC 28682
828-478-7700
September 25, 2025
Brianna Young, NPDES Individual Industrial Permit Lead
North Carolina Division of Energy, Mineral, and Land Resources
DEMLR Stormwater Program RECEIVED
1612 MSC
Raleigh, North Carolina 27699-1612
OCT 02 2025
Subject: Duke Energy Carolinas, LLC.
Marshall Steam Station DEMLR-STORMWATER PROGRAM
NPDES Stormwater Permit NCS000548
Industrial Stormwater Permit Renewal Application
Dear Ms. Young:
Duke Energy Carolinas, LLC requests the subject permit be renewed and reissued. The subject
permit expires on March 31, 2026. Section III Part B of this permit requires the permit
application for permit renewal to be submitted at least 180 days prior to the expiration date of
the permit.
Attached is the renewal application package for your review and processing.
Stormwater runoff has been redirected from outfall SWO12A in December of 2020 through
regrading of the former laydown yard drainage area and abandonment of the single collection
box. Duke Energy requests removal of this outfall from the permit.
It should also be noted that the MAR-145 Surface Water Diversion Basin will be
decommissioned and relocated to the footprint of the ash basin. This aspect was discussed with
your office and the Mooresville Regional Office in May 2025. Once completed, our Stormwater
Pollution Prevention Plan (SWPPP)will be updated accordingly.
Should you have questions or need additional information, please contact Scott LaSala,
Marshall Environmental Field Support Professional at [phone] or Don Safrit, Water Ops
Lead Consultant at [phone].
Sincere ,
Jeffery I agan
Station Plant Manager
Marshall Steam Station
cc: Jerry Eplin, NC DEQ DEMLR Mooresville Regional Office
Scott LaSala, Duke Energy—Marshall Steam Station
Don Safrit, Duke Energy— EHS Water Ops
Brooke Ahrens, HDR Engineering, Inc
www,dukc-enorgy.com
Page 1 of 53

Attachments:
Renewal Application Form 1 and 2F
Supplemental Information:
Attachment 1: Topographic Map from Stormwater Pollution Prevention Plan and
Stormwater Outfall Map with Drainage Areas
Attachment 2: Stormwater Outfall Fact Sheets and Summary of Best Management
Practices
Attachment 3: Summary of Analytical Monitoring Data and Visual Observations
Attachment 4: Stormwater Pollution Prevention Plan Development and Implementation
Certification
Attachment 5: Supplemental Information Checklist
Page 2 of 53

United States Office of Water EPA Form 3510-1
Environmental Protection Agency Washington,D.C. Revised 07/31/2023
Water Permits Division OMB No.2040-0004 Expires 07/31/2026
^EPA Application Form 1
General Information
NPDES Permitting Program
Note: All applicants to the National Pollutant Discharge Elimination System(NPDES)permits
program,with the exception of publicly owned treatment works and other treatment works treating
domestic sewage, must complete Form 1. Additionally, all applicants must complete one or more of the
following forms: 213, 2C, 2D, 2E, or 2F. To determine the specific forms you must complete, consult the
"General Instructions" for this form.
Page 3 of 53

EPA Identification Number NPOES Permit Number Facility Name OMB No.2040.0004
NCD043678879 NCS000548 Marshall Steam Station Expires 07/31/2026
Form U.S.Environmental Protection Agency
1 \=.EPA Application for NPDES Permit to Discharge Wastewater
NPDES GENERAL INFORMATION
SECTIONPD i AND
Z.i Applicants Not Required to Submit Form 1
1.1.1 Is the facility a new or existing publicly owned 1.1.2 Is the facility a sludge-only facility(i.e.,a facility
treatment works or has your permitting authority that does not discharge wastewater to surface
directed you to submit Form 2A? waters)?
If yes,STOP.Do NOT complete No If yes,STOP.Do NOT complete 0 No
Form 1.Complete Form 2A. If the Form 1.Complete Form 2S.
facility is also a treatment works
treating domestic sewage,you
must also complete Form 2S.
E
.22 Applicants Required to Submit Form 1
1.2.1 Is the facility a concentrated animal feeding 1.2.2 Is the facility an existing manufacturing,
operation or a concentrated aquatic animal commercial,mining,or silvicultural facility that is
oil
production facility? currently discharging process wastewater?
z Yes 4 Complete Form 1 and 0 No Yes 4 Complete Form 0 No
R Form 2B. 1 and Farm 2C.
c 1.2.3 Is the facility a new manufacturing,commercial, 1.2.4 Is the facility a new or existing manufacturing,
mining,or silvicultural facility that has not yet commercial,mining,or silvicultural facility that
Cr
commenced to discharge? discharges only nonprocess wastewater?
❑ Yes 4 Complete Form 1 and 0 No Yes +Complete Form 1 0 No
Form 2D. and Form 2E.
1.2.5 Is the facility a new or existing facility whose 1.2.6 Is the facility a new or existing treatment works
discharge is composed entirely of stormwater treating domestic sewage that discharges
associated with industrial activity or whose wastewater to surface waters?
discharge is composed of both stormwater and non-
stormwater?
0 Yes-+ Complete Form 1 and 0 No 0 Yes 4 Complete Farm 1, No
Form 2F unless Form 2S,and
exempted by 40 CFR any other
122,26(b)(14)(x)or applicable forms,
(b)(15). as directed by
your permitting
authority.
ADDRESS,SECTION 2.NAME,MAILING t
C 2_1 Facility Name
0
n Marshall Steam Station
.a 2.2 EPA Identification Number
iO NCD043678879
y
2_3 Facility Contact
a Name(first and last) Title Phone number
= 5cott La5ala Site Environmental Field Support [phone]
d
Email address
E
ca
z [e-mail]
EPA Form 3510-1(Revised 712023) Pagel
Page 4 of 53

EPA Identification Number NPDES Permit Number Facility Name OMB No.2040-0004
NCD043679879 NCS000548 Marshall Steam Station Expires 07/3112026
2_4 Facility Mailing Address
Street or P.O,box
8320 East NC Highway 150
City or town State ZIP code
Terrell NC 28682
2_5 Facility Location
Street,route number,or other specific identifier
t0i 8320 East NC Highway 150
o County name County code(if known)
Catawba
E �' City or town State ZIP code
�
R
M Terrell INC 128682
SECTION 3.SIC • NAICS CODES
3_1 SIC Code(s) Description(optional)
4911 Electric Services
+n
m
0
U
W
U
z 3_2 NAICS Code(s) description(optional)
C
22111 Electric Power Generation
U
m
441 Name of Operator
Duke Energy Carolinas,LLC c/o Jeffery Flanagan(General Plant Manager)
c
s 4_2 Is the name you listed in Item 4.1 also the owner?
E
o Yes ❑ No
4.3 Operator Status
❑ Public—federal ❑ Public—state ❑ Other public(specify)
o ❑ Private v❑ Other(specify) Public utility
4.4 Phone Number of Operator
[phone]
EPA Form 3510-1(Revised 712023) Page 2
Page 5 of 53

EPA Identification Number NPDES Permit Number Facility Name OMB No.2040-0004
NCD043678879 NCS000548 Marshall Steam Station Expires 07131/2026
4.5 Operator Address
o Street or P.O.Box
R
m 8320 East NC Highway 150
A �
- City or town Slate ZIP code
0 0
is Terrell NC �28682
oEmail address of operator
[e-mail]
SECTION • t
Is the facility located on Indian Land?
-' ❑ Yes ❑ No
SECTION •• t
6.1 Existing Environmental Permits(check all that apply and print or type the corresponding permit number for each)
✓❑ NPDES(discharges to ❑ RCRA(hazardous wastes) ❑ UIC(underground injection of
oW surface water) fluids)
.2 NC5000548 NCD0436788879
"` Solid Waste Active Landfill Permit No.18-12, Solid Waste ❑ NESHAPs(CAA)
Closed Landfill-Permit No.18-04, Title V Permit No.
03676T57 Other(specify)
uU NPDES NC0004987{WWl
SECTI• 1
7_1 Have you attached a topographic map containing all required information to this application?(See instructions for
:.. specific requirements.) :-,i o See Attachment I - T opogi"aphiC Location anc
v❑ Yes ❑ CAFO—Not Applicable(See requirements in Form 2B.)
SECTIONOF t
881 Describe the nature of your business.
Marshall Steam Station is a four-unit,coal-and natural gas-fired generating facility located on Lake Norman in
Catawba County,N.C.Named after former Duke Power President E.C.Marshall,the station is one of the largest
power-generating facilities owned by Duke Energy in the Carolinas.The station generates enough energy to power
approximately 2 million homes(rated at 2,090 MW).In 2021,the company completed construction activities to bring
natural gas to the station to allow 50%natural gas co-firing on units 3 and 4 and up to 40%natural gas co-firing on
m units 1 and 2.For every pound of coal displaced with natural gas,sulfur dioxide will be reduced by an estimated 99%,
0 and carbon dioxide emissions will be reduced by about 40%per megawatt-hour.
;v
Z
SECTION •• 1
991 Does your facility use cooling water?
S Yes ❑ No 4 SKIP to Item
9_2 Identify the source of cooling water.(Note that facilities that use a cooling water intake structure as described at
a, 40 CFR 125,Subparts I and J may have additional application requirements at 40 CFR 122.21(r).Consult with your
NPDES permitting authority to determine what specific information needs to be submitted and when.)
W Catawba River(Lake Norman)
c
EPA Form 3510-1(Revised 712023) Page 3
Page 6 of 53

EPA Identificalion Number NPDES Permit Number Facility Name OMB No.2040-0004
NCD043678879 NCS000548 Marshall Steam Station Expires 07/3112026
SECTION I VARIANCE REQUESTS1 1
10.1 Do you intend to request or renew one or more of the variances authorized at 40 CFR 122.21(m)?(Check all that
apply.Consult with your NPDES permitting authority to determine what information needs to be submitted and when.)
Cr ❑ Fundamentally different factors(CWA ❑ Water quality related effluent limitations(CWA Section
X Section 301(n)) 302(b)(2))
❑ Non-conventional pollutants(CWA ❑ Thermal discharges(CWA Section 316(a))
Section 301(c)and(g))
> Not applicable
SECTION 11.CHECKLIST AND CERTIFICATION STATEMENT(40 CFR 122.22(A)AND(D))
In Column 1 below,mark the sections of Form 1 that you have completed and are submitting with your application.
For each section,specify in Column 2 any attachments that you are enclosing to alert the permitting authority.Note
7that not all applicants are required to provide attachments.
Column 1 Column 2
❑ Section 1:Activities Requiring an NPDES ❑ wl attachments
Permit
❑ Section 2:Name,Mailing Address,and ❑ wl attachments
Location
✓❑ Section 3:SIC Codes ❑ w/attachments
✓❑ Section 4:Operator Information ❑ wl attachments
r❑ Section 5: Indian Land ❑ wl attachments
Section 6:Existing Environmental Permits ❑ wl attachments
❑
r wl topographic ma 0 wl additional Section 7: Map See Attachment 1 ❑ p attachments
w
o ✓❑ Section 8:Nature of Business ❑ wl attachments
❑ Section 9:Cooling Water Intake Structures ❑ wl attachments
❑ Section 10.:Variance Requests ❑ wl attachments
❑ Section 11:Checklist and Certification Elwl attachments
Y Statement
11.2 Provide the following certification.(See instructions to determine the appropriate person to sign the application.)
Certification Statement
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 property 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
passibility of fine and imprisonment for knowing violations.
Name(print or type first and last name) Official title
Jeffery Flanagan General Plant Manager
Sig re Date signed
/2P Z� l
EPA Form 3510-1(Revised 712023) Page 4
Page 7 of 53

United States Office of Water EPA Form 3510-2F
Environmental Protection Agency Washington,D.C. Revised 07/31/2023
Water Permits Division OMB No.2040-0004 Expires 07/31/2026
V"" ApplicationEPA Form 2F
Stormwater Discharges
Associated with Industrial
Activity
NPDES Permitting Program
Note: Complete this form and Form 1 if you are a new or existing facility whose discharge is composed
entirely of stormwater associated with industrial activity, excluding discharges from construction
activity under 40 CFR 122.26(b)(14)(x) or(b)(15). If your discharge is composed of stormwater and
non-stormwater, you must complete Forms 1 and 2F, and you must complete Form 2C, 2D, or 2E, as
appropriate. See the"Instructions"inside for further details.
Page 8 of 53

EPA Identification Number NPDES Permit Number Facility Name OMB No.2040-0004
NCD043678879 NCS000548 Marshall Steam Station Expires 07/31/2026
Form U.S Environmental Protection Agency
2F R1 EPA Application for NPDES Permit to Discharge Wastewater
NPDES STORMWATER DISCHARGES ASSOCIATED WITH INDUSTRIAL ACTIVITY
SECTIONOUTFALL LOCATIONI
1.1 Provide information on each of the facilit 's outfalls in the table below
Outfall Receiving Water Name Latitude Longitude
Number
See Attachment 1 : Stormwater Outfall Map and Summary Information for
a Outfalls SW002, SW003, SW007, SWO08, SW011, SW012, SW022, SW025,
o and SW026
J
{4
7
SECTION '• i
2.1 Are you presently required by any federal, state,or local authority to meet an implementation schedule for
constructing,upgrading,or operating wastewater treatment equipment or practices or any other environmental
programs that could affect the discharges described in this application?
❑ Yes ❑ No 4 SKIP to Section 3.
2,.2 Briefly identify each applicable project in the table below.
Final Compliance
Brief identification and Affected Outfalls Source(s)of Discharge Dates
Description of Project (list outfall numbers)
Required Projected
N/A
N
C
Gf
d
O
C.
E
2.3 Have you attached sheets describing any additional water pollution control programs(or other environmental
projects that may affect your discharges)that you now have underway or planned?(optional item)
❑ Yes 0 No
EPA Form 3510.2F(Revised 712023) Page 9 of 53 Page 1

EPA Identification Number NPDES Permit Number Facility Name 4MB No.2040-0004
NCD043678879 NCS000548 Marshall Steam Station Expires 0713112026
SECTION .• r
a� 3�11 Have you attached a site drainage map containing all required information to this application?(See instructions for
2 specific guidance.) See Attachment 2 for Stormwater Outfall Fact Sheets and
© � Yes Summary Information
SECTION 4.POLLUTANT SOURCES
4_1 Provide information on the facility's pollutant sources in the table below,
Outfalt Impervious Surface Area Total Surface Area Drained
Number (within a mile radius of the facility) (within a mile radius of the facility)
' nits
See Attachment 2 for Stormwater Outfall Fact Sheets and Summary
Information for Outfalls SW002, SW003, SW07, SW008, SW011, SW012, airs
SW022, SW025, and SW026, including drainage area descriptions and
potential pollutant sources
nits
SpLcify units specify units
specify units specify units
specify units specify units
4_2 Provide a narrative description of the facility's significant material in the space below.(See instructions for content
requirements.)
See attached Stormwater Management Strategy Section 2.2 from the SWPPP(see Attachment X)
m
a
c
0
4_3 Provide the location and a description of existing structural and non-structural control measures to reduce pollutants
in stormwater runoff. See instructions forspecificguidance.)
Stormwater Treatment
Codes
Outfall from
Number Control Measures and Treatment Exhibit
2 F-1
list)
See Attachment 2 for Stormwater Outfall Fact Sheets and Summary
Information for Outfalls SW002, SW003, SW007, SW008, SW011, SW012,
SW022, SW025, and SW026, including drainage area descriptions and
potential pollutant sources
EPA Form 3510-2F(Revised 712023) Page 10 of 53 Page 2

EPA Identification Number NPDES Permit Number Facility Name OMB No.2040-0004
NCD043678879 NC5000548 Marshall Steam Station Expires 0713112026
SECTION 5.NON STORMWATER 1 1
55.1 Provide the following certification.(See instructions to determine the appropriate person to sign the application.)
I certify under penalty of law that the outfall(s) covered by this application have been tested or evaluated for the
presence of non-stormwater discharges. Moreover, I certify that the oulfalls identified as having non-stormwater
discharges are described in either an accompanying NPDES Form 2C, 2D,or 2E application.
Name(print or type first and last name) Official title
Jeffery Flanagan General Plant Manager
Signature Date signed
U) D g12-5-
126LS
5.2 Provide the testing information requ ed in the table below.
T Out-fall Onsite Drainage Points
Number Description of Testing Method Used Dates)of Testing Directly Observed
During Test
0
All Duke Energy Huntersville Lab(NC248) All Outfalls
0
SECTION 6.SIGNIFICANT LEAKS
OR !
—t Describe any significant leaks or spills of toxic or hazardous pollutants in the last three years.
.Q
(n There have been no significant leaks or spills within the past three years upgradient of stormwater Outfalls that
O have reached Waters of the LJ,S.through the Industrial Stormwater Outfalls.
a�
SECTION 7.DISCHARGE
w
INFORMATIONI
See the instructions to determine the pollutants and parameters you are required to monitor and,in turn,the tables you must
cam lete.Not all applicants need to complete each table.
7.1 Is this a new source or new discharge?
Yes 4 See instructions regarding submission of No 4 See instructions regarding submission of
5 estimated data. actual data.
m Tables A,B,C,and D -
_? Have you completed Table A for each outfall?
0 Yes
EPA Form 3510-217(Revised 7f2023) Page 11 of 53 Page 3

EPA Identification Number NPOES Permit Number Facility Name OMB No.2040-0004
NCD043678879 NCS000548 Marshall Steam Station Expires 0713112026
7_3 is the facility subject to an effluent limitation guideline(ELG)or effluent limitations in an NPDES permit for its
process wastewater?
❑v Yes ❑ No -* SKIP to Item 7.5.
7 4 Have you completed Table 8 by providing quantitative data for those pollutants that are(1)limited either directly or
indirectly in an ELG andlor(2)subject to effluent limitations in an NPDES permit for the facility's process
wastewater?
0 Yes
7_5 Do you know or have reason to believe any pollutants in Exhibit 2F-2 are present in the discharge?
❑ Yes ❑ No 4 SKIP to Item 7.7.
7_6 Have you listed all pollutants in Exhibit 2F-2 that you know or have reason to believe are present in the discharge
and provided quantitative data or an explanation for those pollutants in Table C?
r❑ Yes
777 Do you qualify for a small business exemption under the criteria specified in the Instructions?
❑ Yes 4SKIP to Item 7.18. v❑ No
a 7_8 Do you know or have reason to believe any pollutants in Exhibit 2F-3 are present in the discharge?
CD
❑✓ Yes ❑ No 4 SKIP to Item 7.10.
v
0 7^9 Have you listed all pollutants in Exhibit 2F-3 that you know or have reason to believe are present in the discharge in
Table C?
E
[� Yes
7.10 Do you expect any of the pollutants in Exhibit 2F-3 to be discharged in concentrations of 10 ppb or greater?
T ❑ Yes ❑ No 4 SKIP to item 7.12.
0
7.11 Have you provided quantitative data in Table C for those pollutants in Exhibit 2F-3 that you expect to be discharged
in concentrations of 10 ppb or greater?
r❑ Yes
7,12 Do you expect acrolein,acrylonitrile,2,4-dinitrophenol,or 2-methyl-4,6-dinitrophenol to be discharged in
concentrations of 100 ppb or greater?
❑ Yes 0 No 4 SKIP to Item 7.14.
7.13 Have you provided quantitative data in Table C for the pollutants identified in Item 7.12 that you expect to be
discharged in concentrations of 100 ppb or greater?
R Yes
7.14 Have you provided quantitative data or an explanation in Table C for pollutants you expect to be present in the
discharge at concentrations less than 10 ppb(or less than 100 ppb for the pollutants identified in Item 7.12)?
Fv� Yes
7.15 Do you know or have reason to believe any pollutants in Exhibit 217--4 are present in the discharge?
❑ Yes ❑✓ No 4 SKIP to Item 7.17.
EPA Form 3610.217(Revised 712023) Page 12 of 53 Page 4

EPA Identification Number NPDES Permit Number Facility Name OMB No.2040-0004
NCD043678879 NCS000549 Marshall Steam Station Expires 07131/2026
716 Have you listed pollutants in Exhibit 2F-4 that you know or believe to be present in the discharge and provided an
explanation in Table C?
❑ Yes
7.17 Have you provided information for the storm event(s)sampled in Table D?
c
❑✓ Yes
O
U
o Used or Manufactured Toxics
S2 718 Is any pollutant listed on Exhibits 2F-2 through 2F--4 a substance or a component of a substance used or
,2 manufactured as an intermediate or final product or byproduct?
❑ Yes 0 No 4 SKIP to Section 8.
R 7.19 List the pollutants below,including TCDD if applicable.Attach additional sheets,if necessary.
U
N_
1. 4. 7.
2. 5. 8.
3. 6. 9.
SECTION • i
8_1 Do you have any knowledge or reason to believe that any biological test for acute or chronic toxicity has been made
on any of your discharges or on a receiving water in relation to your discharge within the last three years?
M
M
I ❑ Yes ❑ No 4 SKIP to Section 9.
r 8_2 Identify the tests and their purposes below.
Submitted to NPDES
Test(s) Purpose of Test(s) Date Submitted
X Permitting Authority?
0
❑ Yes El No
M
o ❑ Yes ❑ No
a
iaa
❑ Yes ❑ No
SECTIONf^ •
9.1 Were any of the analyses reported in Section 7(in Tables A through C)performed by a contract laboratory or
consulting firm?
❑ Yes ❑ No 4 SKIP to Section 10.
0
992 Provide information for each contract laboratory or consulting firm below.
is Laboratory Number 1 Laboratory Number 2 Laboratory Number 3
E
,o Name of laboratory/firm
C
Lo
2.1
Laboratory address
0
Phone number
U
Pollutant(s)analyzed
EPA Form 3510-2F(Revised 712023) Page 13 of 53 Page 5

EPA Identification Number NPDES Permit Number Facility Name OMB No.2040.0004
NCD043678874 NCS000548 Marshall Steam Station Expires 07/31/2026
SECTION f 41 1
10.1 In Column 1 below,mark the sections of Form 2F that you have completed and are submitting with your application.
For each section,specify in Column 2 any attachments that you are enclosing to alert the permitting authority.Note
that not all applicants are required to complete all sections or provide attachments.
Catumn 9 Column 2
0 Section wl attachments(e.g.,responses for additional outfalls) t.-' Attachrnci,t
Section 2 ❑ wl attachments
❑ Section 3 0 wl site drainage map See Attachment's i and 2
0 Section 0 wl attachments See Attachr` ent 2
0 Section 5 ❑ wl attachments
Section 6 ❑ wl attachments
❑✓ Section 7 ❑ Table A ❑ w/small business exemption request
w
❑ Table B 0 wl analytical results as an attachment
0 Table C 0 Table D
U
d 0 Section 8 ❑ wl attachments
c�
€ ❑ Section 9 ❑ wl attachments(e.g.,responses for additional contact laboratories or firms)
U 0 Section 19
v
c 11 0•2 Provide the following certification.(See instructions to determine the appropriate person to sign the application.)
Certification Statement
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 fine
and imprisonment for knowing violations.
Name(print or type first and last name) Official title
Jeffery Flanagan General Plant Manager
Signature Date signed
0g12,512-V2,5
EPA Form 3510-2F(Revised 712023) Page 14 of 53 Page 6

EPA Identification Number NPDES Permit Number Facility Name Oulfall Number OMB No.2040-0004
NCD043679879 NCSOOD548 Marshall Steam Station Expires 0713112026
TABLE A.CONVENTIONAL AND NON • • E
You must provide the results of at least one anal sis for every pollutant in this table.Complete one table for each outfall.See instructions for additional details and requirements.
Maximum Daily Discharge Average Daily Discharge Source of
(specify units) (specify units) Number of Storm Infonnation
Pollutant or Parameter Grab Sample Taken Flow-Weighted Grab Sample Taken plow-Weighted Events Sampled (new sourcelnew
During First During First dischargers only;use
30 Minutes Composite 30 Minutes Composite codes in instructions)
I
1, Oil and grease See Attachment 3 for Stormwater Outfall Summary Results from Sampling Events
2. Biochemical oxygen demand(BODS)
3. Chemical oxygen demand(COD)
4. Total suspended solids(TSS)
5. Total phosphorus
6. Total Kjeldahl nitrogen(TKN)
7. Total nitrogen(as N)
pH(minimum)
8.
pH (maximum)
ti Sampling shall be conducted according to sufficiently sensitive test procedures(i.e„methods)approved under 40 CFR 136 for the analysis of pollutants or pollutant parameters or
required under 40 CFR Chapter I,Subchapter N or 0.See instructions and 40 CFR 122.21(e)(3).
The discharge is an existing discharge and composed exclusively of stormwater (i.e., no process or nonprocess wastewater)
EPA Form 3510-2F(Revised 712023) Page 15 of 63 Page 7

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Page 16 of 53

EPA ldentlfication Number NPDES Permit Number Facility Name Outfali Number OMB No.2040-0004
NCD043678879 NC5000549 Marshall Steam Station Expires 0713112026
List each pollutant that is limited in an effluent limitation guideline(ELG)that the facility is subject to or any pollutant listed in the facility's NPDES permit for its process wastewater(if the
facility is operating under an existing NPDES permit).Complete one table for each outfall.See the instructions for additional details and requirements.
Maximum Daily Discharge Average Daily Discharge Source of
Pollutant and CAS Number (specify units) (specify units) Number of Storm Information
Grab Sample Taken Grab Sample Taken (new sourcelnew
(if available} During First Flow-Weighted ed During First Flo Composite
Events Sampled dischargers only;use
30 Minutes Composite 30 Minutes Composite codes in instructions)
I I
See Attachment 3 for Stormwater Outfail Summary Results from Sampling Events
I Sampling shall be conducted according to sufficiently sensitive test procedures(i.e.,methods)approved under 40 CFR 136 for the analysis of pollutants or pollutant parameters or
required under 40 CFR Chapter I,Subchapter N or 0.See instructions and 40 CFR 122.21(e)(3),
EPA Form 3510-2F(Revised 7/2023) Page 17 of 53 Page 9

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Page 18 of 53

EPA Identification Number NPDES Permit Number Facility Name Outfall Number OMB No.2040-0004
NCD043678879 NC5000548 Marshall Steam Station Expires 07/3112026
f •� 1• 1 1 MEM-MEE=11111
List each pollutant shown in Exhibits 2F-2,2F-3,and 2F-4 that you know or have reason to believe is present.Complete one table for each outfall.See the instructions for additional
details and requirements.
Maximum Daily Discharge Average Daily Discharge Source of
Pollutant and CAS Number s ecif units s ecif units Number of Storm Information
Grab Sample Taken Grab Sample Taken (new sourcelnew
{if available} During First Flow-Weighted ed During First Flo Composite
Events Sampled dischargers only;use
30 Minutes Composite 30 Minutes Composite codes in instructions)
See Attachment 3 for Stormwater Outfall Summary Results from Sampling Events
Sampling shall be conducted according to sufficiently sensitive test procedures(i.e.,methods)approved under 40 CFR 136 for the analysis of pollutants or pollutant parameters or
required under 40 CFR Chapter I,Subchapter N or 0.See instructions and 40 CFR 122.21(e)(3).
EPA Form 3510-2F(Revised 7)2023) Page 19 of 53 Page 11

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Page 20 of 53

EPA Idenlification Number NPDES Permit Number Facility name Outfafl Number OMB No.2040-0004
NCD043678879 NC5000548 Marshall Steam Station Expires 07/3112026
TABLE D.STORM EVENT INFORMATION
Provide data for the storm event(s)that resulted in the maximum daily discharges for the flow-weighted composite sample.
Number of Hours Between
Total Rainfall During Maximum Flow Rate
Duration of Storm Event Beginning of Storm Measured and Total Flow from Rain Event
Date of Storm Event Storm Event During Rain Event
(in hours) End of Previous Measurable Rain (in gallons or specify units)
(in inches) Event (in gpm or specify units}
See Attachment 3 for Stormwater Outfall Summary Results from Sampling Events
Provide a description of the method of flow measurement or estimate.
EPA Form 3510-2F(Revised 712023) Page 21 of 53 Page 13

Marshall Steam Station
Storm Water Permit NCS000548
Individual Permit Application
Supplemental Information and Attachments
Page 22 of 53

Attachment 1
Topographic Location Map
Stormwater Outfall Map with Drainage Areas
Page 23 of 53

1 !."';IrCsawi,It t�o ,mil A L V 7 i
\1 f f !j ) - /� l"` �` \ AU tuber List
Duke Energy Property Boundary .� , f � �` / `t AU Number: 11-(75)
L AU Name: CATAWBA RIVER (Lake Norman below elevation 760)
Classification: WS-IV,B;CA ;
0 Feet 2,000 � —• s /
�--�:� -.,, � �. - I O ` � ' IRCatagory:4t- Fish Tissue Mercury; 303(d)Year: 2008 �
'STORMWATER OUTFALLS FROM MARSHALL y1 \ `� a - \� IRCategory:5 - PCB Fish Tissue Advisory; 303(d)Year: 2014 a
STEAM STATION DISCHARGE INTO ♦` S G /' • �� - `� �`
THE CATAWBA RIVER(LAKE NORMAN). I �'•~� ' '+ _ / / \� \, \ � a,r K
'- SOURCE:LAKE NORMAN NORTH '- - T is \ •
24K USGS QUADRANGLE,1993
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r— Co � t O 20,!3eNNat�onal Geographic ociet• i cubed /
pY, ,i� , . -
MARSHALL STEAM STATION
DUKE ENERGY, GENERAL LOCATION MAP
FIGURE 1
PATH:V:IPROJECTS101123>DU KEENER GYI023i104 0UKE NI-PERMITO—ALLSUPPORTIMAP D OCSIKIXD41ARS HAL LIS PPPNAR 9HAL L L OCATION NIAP 11X1IREV.I.IXD•USER:ENIULARSK.DATE:C1412015 MARSHALL STEAM STATION-STORMWATER POLLUTION PREVENTION PLAN

l
Ax •' Yry ,X F .� �
ILF CELLS 1&2
# ,,, r'.. f_ ILF CELLS 3&4'
�� ' • .,�. / ILF CELLS 5&6 - -
''
SHERRI
SELF,87E�
MAR14All
S
PUMP
STRU_C_TURAL F,7LL
STORMW%1TER
. '.•' M IFL CELLS 7&8 •�f ',r ' PLUNGE PO'O�UdWO7
}`i'S , t
DRY ASH LANDFILL 1004
/ PHASEII S
11A � a MAR 152
-, z � .� I..•. � •�!: � •L ..� PLUNGE w;-?.
6 ' PO
IO�L ANO
4
4 '
t STRUCTURAL FILL - � � D �•4 • - -
16 : 4
.1 FORMER
•- -- PV FIElO _ � � �` •• •-
i
1SO4�PHASELAlIDFILL
RMER
NPDES'004 •j
P ED ASH
2U BASIN +'
FORMER FGD � r
CONSTRUCTED WETLANDS h' ,
TREATMENT SYSTEM r
R ~ °'' •` DISCHARGE e��
TOWER o=
C mo
G
S PLAT
NO MAN
'(' w BOTTOM ASH
OU
I NPDES' ,/• �•. - � .SUBMERGED' g
m 'f TFACE 010 •_f' ?t' 'tr FL HT
CONVEYOR

RipmLEGEND
=Property Boundary
' r
Overhead Power Line
-Landfill Boundary
ILF CELLS 1 k2 Ash Basin Waste Boundary
ILF CELLS 3&4 ' - Pipeline
—�Wastewater Outfall
if \ ILF CE Stormwater Outfall
LLS 5&6 r L f�
Corrective Action Project
OFirst Responder Zones
P LI STRUCTURE LEGEND
L
Elevated Water Tank
_ - O Fuel Oil Unloading Area
1 - Q Fuel Oil Tanks
•�' - O4 Urea Tanks
PUMP Community Building
,� 7- � STRUCTUW1L.h,1LL
Precipllator Units 3&4
IFL CELLS 7&6 �,r- PLUNGE POO TLIfW01 O7 Powerhouse Units 1-4
A
Gypsum&Limestone Conveyor Belts
♦s r - r O SCR Area
10 Stormwater Collection Pond
i. XJ 71 Electrical Building
�' (r DRY ASH LANDFILL 1004
PHASE II
1® Ball Mil)
Reagent Feed Tanks
s Scrubber Site
Z t �
- ' �r ;��� • \- 4 .MAR 152 Warehouse
PLUNGE
POOLAND r' 1® Sump#1 and#1A
Billy
Sump#2
UO U Lt., 16 +, ti �-• 1® Intake
'44x �f
F �; 19 Urea Tank Farm
Retired Constructed Welland
Treatment System
�1,. A r! ♦ - i gp�,�,
Limestone Area Stormwater Basin
New Wastewater Treatment System
10
.li
FORMER
PV FIELD mil•
V.
Ste. "�! ., �1 ,r -♦ ,. i
1SWPHASE1 .,
DFILL
I r �
.t� FORMER
NPDES 004
NPOE
\- yA PONDED '•
ASH \ t L
BASIN t
FORMER FGD
RSTRUCTED WETLANDS
�. .TREATMENTSYSTEM
DISCHARGE
TOWER r
O� CO
M
R 4y. _ LAKE L
,�tl
9 `. •
fill
• � 2� �My� � oMABH L.
�NPDES ,7 - S BMEl26ED
AS
i
WEPOND

�••' .Ia - • f y DRY ASN LANDFiL 0111104
• a.. - .MAR 152
PLUNOE
''{ POOL AND
ly-
STRUCTURAL FILL 16 \'v :, {�' + V
mWBORRKWAL'
EAI"'�'
if
- FORMER - ,s � '� `t+ •�, f T
t - PV FIELD
a err 7
cty _ `►� fir- 7 PHA El
DFILL
FORMER
!� 1 V. YNPDES 004
6 PONDED
��--Y ASH
BASIN �� w
FORMER FGD
•� STRUCTED WETLANDS
I * TMENT SYSTEM ,
14,
f ' DISCHARGE
TOWER =T
� MO
IT h PLAT
-J � /R •�; 91..4f O� �/'tea..
/ N D 02
�'�„ •p LAKE L
NO MAN
ED
ERO
BO H
aUBM ED 8
�« p '
t a•-m- m OUTFAL'L 010 ,$ �, � ,�. t'{,.. - r � 'CONV OR
A A 1 HOLDING ' s -/� .•• � �"•
_ r^•f' — e POND "F ��sS+ r
PONb
7 s; tF
_ •r•! WEa COAL
\ POND 'r
t Y •Y e` GYPSUM.
J '•G' ' STACKOUT \ ER
-- S NDARY Stornammit8r OUtfaU Description and Drelneye
* •' ` . Dulfells CDdltlinates ReceiAnp Water Body Area
.1 PD S 2A 35'35'53'N 24-inch-CMP to the Calmoa River
r
SVA02 80'Sr So"N (Lake Norman) 3 3
ILY -- NP 8 B K "F'P RKI SVM3 35'36'1t"N Rip rap dish to the Catawba River 35
80'Sr 87'W (Lake Norman)
35'35'56"f Nt l 60- h-damekr CMP to the S'A007 so,sr 51"W Catawba River lLake Norman) 382
M3R STACKOUT �� t NP a�p3 ,. ^�•..
YARD 3 RECLAIM 2 t S.. 35'35'53"N 8-inch-Wameter CMP to the 011
4 \ so,Sr 51"W Catawba River IL N"an)
Nan)
OR ENT B N
N � •
35 35'43 N 24-Inch-6ameter HDPE to the 5 4
s- 80'Sr 52'W Catawba River iLake Norman)
a A s SWITCHYARD _. :' ". \ t - \Gt4 I>f! 5'J10t2 35'WSW N 18-Nth-6ameter HOPE to the� `� �,>,• � 60'Sr•47"W Catavrba River{Lake Harman)
N_ �',e r ` r�r;4���yyysss _a r. y L 11102^ 35'35'44"ll 18-Inch-dlarr wconoyated HDPE 08
.A ft F ^JTL 80'Sr 52"W to the Cata'roa River(Lake Norman)
O "E"PARKING SW425 35'35'44"N 04slte draswe area 01h temporary 2226
60'5r 5*W southwest Ponds(East&),es1)
WITO
t� TROL
N 35'3S 54 244r ch diameter HDPE to a cove of
s ,1 SW626 r30'Sr 41"W the Catawba River Rake Norman)) 90

SCR Are.
1F ha.• i r4,,. •' a�, ' 7® Stormwater Collection Pond
II ' !• �-� M�+I`,)•.*�` ! 71 Electrical Building
�k. 4ASH
HLANIE DFILL 1aW ` - r 1® Ball MillPHAew,il ; 1© Reagent Feed Tanks
N f
Scrubber Site
O ` + T t s .MAR 732 Q Warehouse
•, PLUNGE
.¢!* •�~�� � �` a � � r��• r POOL AND .:,p � Sump k1 and ktA
l� tt-•� a r' � Q Sump k2
STRUCTURAL FILL `\ r v
w �� >. C�
..�A . r 19 Intake
� � Urea Tank Farm
4t, •r� -' _ ®g Retlrod Constructed Weiland
,L� �,•)d \ '��r.-^ter RORROWAREAI' Treatment System
'1}% .-, _ r ♦ "' t. Limestone Area Stormwater Basin
New Wastewater Treatment System
0 Feet Soo
FORMER r.
PV FI:L.
PHASEI
T
n Y I r r,•A �.
r r1 r
FORMER y,
NPDES 004 I,
.t A PONDED
..� - ASH
BASIN
�p FORMER FGD
UCTED WETLANDS _ _ a
A. EATMENT SYSTEM
O
DISCHARGE =Q
_ TOWER
b, Opp
� MO
o .
GUIRF
va
MAN p
7 (BOTTOM ASH
NPDES A SUBMERGED S -• a`
OUTFA IL 01 •�' FLIGHT r.6^
rn �� ,7-`. CONVEYOR - !Y
HO ING � re n �y .vv. •Y * I
GYPSUM
DARY STACKOUT ' PER ( ED Permit
=C \ OVSE Slormweter Outtall Description and Drainage Impervious
• ,�. NPDESO .:- Ct70ldillatee Monitoring Dra)nageAreaRunottDescriptlon
OuUalb Receiving Water Body Area Area Table
I - ` NPDES 002A `� R 35'35.53"N 24-hch-CMP to the Catawba F6vr Drainage area runoff from miscellanscus
e - 12A 1 S'�'�2 SO'5T 50"W (Lake Norman) 33 0% 1 matedab storage area along the intake canal
fIq
f NPD S RYA `1it♦P4" .�' Ls i� -a. "�P RIU 57rfr03 35'3F t 1"N Rip rap ditch to the Catawba River 35 0% 1 Drainage area rtatoR from rtistellanaeus
`'•.✓'"� 0.,Sr 67"W t—.11armanj matedab storage area along the intake anal
Drainage area rlanoff from the n ikhyard,
;,,,•••• •r St4i1•-! is r - "t 35'35'56"N 604ndn-dameter CMP to the Powerhouse yard red fines and areas extending
r D KINGS Q+ W +T \ R' S'l.'007 382 5% 4
Z• �,, „•- _ 6o,Sr 51"W Calawba Rarer(Lake Norman) west to the Wfpstmt haul road,all into the intake
- •r,M3RO LIMESTONE canal
i STACKOUT
TARD,Z+ 8 RECW_M �+ s 12 ran. ON r� S'1r009 35'35,53,N 84rich-diameter CMP to the 0.1 ?0% 5 Drainage area tuoolf from pared area east of the
+Gy, 1 / J ti / •-d 'r R ENTA N so,Sr 50"W Catawba River(Lake rkmmn) Pmeatiouse into ton intake canal
�r E Drainage area nand!from the plant erriancs,
+ sr -r <; y _-i1t T• 35'35'49"N ]4-Inch HOPE to the
s ••'��!j vt i 5VA/7 54 5% roadway.
the tuel unloading drives and Iwbdc
So'Sr 5"W Catawba Wier snake Normal roadway.
�1•'' SYIIi m Ii.�TC"BARD•.'�S tt��\t /11.'� e�; rat~ 3S'IS-SO-N 18-Inch-diameter HDPE io the Drainage area tra scrubber vicinity underneath
GypgV k SVt012 60'57'47"W Calavba River tLake Norman) - 10% 8 ductwork upgradlem of intake canal
Drainage area runoff from gravel laydorm and
35'35'44"N 18-inch corrugated HDPE
• A s SYf02_'r °� 0 8 0% 9 veto the discharge
ischareas and FOD access road area
r( F D STORM SD'Sr 52"W to the Catxba Risvr(Lake Norman)
��• �.• " V 6 _ _ Mtotlnadlschargecanal,
�r M,
EE PTA KING a nine drainage Saving onshe from the aoutM•.ros1
t
+-.,' S'Ab�S 35'35'44"N OffsSe draatagt area vtith temgerari 2226 0% 1J/AlrJevr and Industrial stomw+ater frcm iha slruclural fill is
So'Sr 52"W southwest pond!(East&West) Curtail cdtedetl t•Mldn an stile pond and pnanped north
�, •i r AAO OU and east to the drainage area ouffall.
1; t A 1 L Odsde d aln te age into the a from the northeast
capped IandAIM,new ate tad roan,still bcrtmv
C G
area 3 and acdvs Ian09d collecocn Arta$ These
- -» 2 e Cat wba River
H PE to a cave of Sons are collected within an onsite retention
:..• EL EA
SV1026 60' 41"W Ihs Catawba River(Lake Norman). 90 0% SW626 basin(MAR.152)and pumped through a drainage
�f•.r:-,i. .,�, '. +k i• p O y pipe badlnp do�mhNt to a npfap lined reentlon
L7\ _ "".•�'4 _ area fpWnge goon batore dischardnit to a co:'e of

Attachment 2
Stormwater Outfall Fact Sheets
Summary of Best Management Practices
Page 26 of 53

f'DUKE
N ENERGY
Location: Marshall Steam Station
SDO Narrative Description and BMP Summary Permit No. NCS000548
Outfall ID: SWO02
Discharge Structure: 24" CMP
Location: Intake canal, south of
current boat ramp and '=b .
ash basin discharge
structure
Latitude -Longitude: 35°36'23", 80'57'35" E.
Drainage Area: 3.3 acres 4
Percent Impervious: 0%
Permit Monitoring Table 1
Table:
Industrial Activities Outfa[I SWO02 includes mid-section of the vegetated slope of the ash basin
and Description: dike, gravel road and gravel storage yard area northeast of the Powerhouse.
This area includes the embankment slope between the former Outfall
SWO01 and Outfall SWO03 drainage areas. The embankment of the ash
basin dike is sloped at a ratio of two horizontal to one vertical (2H:1 V)and
covers approximately 80 percent of the drainage area.
The discharge from Outfall SWO02 flows down a rip rapped embankment
approximately 10 yards before reaching the intake canal.
The gravel laydown area is used for various quantities of construction
material such as structural steel, cable, truck trailers, various construction
equipment and personnel vehicle parking and other inert materials at various
times.
Significant Inert Materials: Various quantities of construction equipment,
Materials/Potential stockpiles of gravel or dirt, structural steel, cable,
Pollutants: truck trailers, and other inert materials may be
stored on the gravel storage area at various times.
BMP Summary: Fugitive Dust Emissions
• Establish procedures to minimize offsite tracking of dust.
Material Storage Areas
• Control leakage or spillage from vehicles or containers and ensure
that proper protective measurement.
• Cover material with a temporary covering made of polyethylene,
polyurethane, polypropylene, or hypalon.
• Provide diversion berms, dikes or grassed swales around the
perimeter of the area to limit run-on.
• Construct an enclosure or build a berm around the area.
• Regularly sweep area to minimize debris on the ground.
• Train employees in spill prevention, control, cleanup and proper
materials management techniques.
Page 27 of 53

DUKE
m' ENERGY
Location: Marshall Steam Station
SDO Narrative Description and BMP Summary Permit No. NCS000548
Outfall ID: SW003
Discharge Structure: Ri ra -lined ditch
Location: Intake canal, midway
along miscellaneous
material storage
area, east of ash
basin embankment
Latitude - Longitude: 35036'11", 80°57'67"
Drainage Area: 7 tF .-
3.5 acres
Percent Impervious: o 1.
Permit Monitoring
Table 1
Table:
Industrial Activities Outfall SW003 includes southernmost section of the gravel road and gravel
and Description: storage yard area northeast of the Powerhouse. The outfall drainage path is a
ditch that extends from the eastern edge of the gravel road to the intake canal.
The gravel laydown area is used for various quantities of construction material
such as structural steel, cable, truck trailers, various construction equipment
and personnel vehicle parking and other inert materials at various times.
Significant Inert Materials: Various quantities of construction equipment,
Materials/Potential stockpiles of gravel or dirt, structural steel, cable,
Pollutants: truck trailers, and other inert materials may be
stored on the gravel storage area at various times.
BMP Summary: Fugitive Dust Emissions
• Establish procedures to minimize offsite tracking of dust.
Material Storage Areas
• Control leakage or spillage from vehicles or containers and ensure
that proper protective measurement.
• Cover material with a temporary covering made of polyethylene,
polyurethane, polypropylene, or hypalon.
• Provide diversion berms, dikes or grassed swales around the
perimeter of the area to limit run-on.
• Construct an enclosure or build a berm around the area.
• Regularly sweep area to minimize debris on the ground.
• Train employees in spill prevention, control, cleanup and proper
materials management techniques.
Page 26 of 53

�&DUKE
''� ENERGY.
Location: Marshall Steam Station
SDO Narrative Description and BMP Summary Permit No. NCS000548
Outfall ID: SW007
Discharge Structure: 601, CMP
Location: Intake canal, main k •; k `*�
powerhouse yard
drainage, across from
warehouseryA;v.
Latitude etude:-Lon
g 35°35'S6", 80°57'S1" + f�
Drainage Area:
382 acres
Percent Impervious: 5%
Permit Monitoring Table 4
Table:
Industrial Activities The drainage area for SW007 comprises areas immediately north and
and Description: extending west of the Powerhouse. The drainage area includes the roofs of
the office annex, service building and the remaining portion of the
warehouse.The drainage area also includes 5 acres of paved Powerhouse
yard areas and parking lots, 4 miles of rail line, and a 3 acre graveled
switchyard. Roofed areas comprise approximately 35,000 square feet.
Vegetated embankments and outlying vegetated areas west of the
Powerhouse comprise most of the SW007 drainage area.
Located within the SW007 drainage area is approximately 50 drums of lube
oil, and small containers of hydrazine, glycerin and 2-propanol, stored inside
the warehouse. Approximately 1,400 linear feet of the covered FGD
limestone and gypsum conveyors cross through the SW007 drainage area.
Drainage Area SW007 includes small transformers containing mineral oil
located in the 3 acre graveled switchyard.
On rare occasions, the stormwater discharge from SW007 is comingled with
the NPDES permitted overflow from Sump#1 (NPDES Outfall 002A).
Outfall SW007 discharges directly into the intake canal.
Significant Oil: Transformers containing a total of 340 gallons of
Materials/Potential mineral oil are located in the switchyard.
Pollutants: Approximately 50 drums of lube oil are stored
inside the Warehouse. Drum deliveries are made
at the Warehouse. These drums are not routinely
exposed to stormwater.
Gypsum and Limestone: Approximately 1,400 feet of the covered FGD
limestone and gypsum conveyors cross through
the SW007 drainage area.
Chemicals: Small containers of hydrazine, glycerin and 2-
propanol are stored inside the Warehouse. These
containers are not routinely exposed to
stormwater.
Page 29 of 53

I .DUKE
,C ENERGY.
Location: Marshall Steam Station
SDO Narrative Description and BMP Summary Permit No. NCS000548
BMP Summary: Fugitive Dust Emissions
• Establish procedures to minimize offsite tracking of dust.
• Wash vehicles before they leave the site in a designated area where
wash water can be controlled.
Delivery Vehicles:
• Develop procedure for the inspection of all vehicles arriving on the
plant site and ensure overall integrity of the body or container.
• Control leakage or spillage from vehicles or containers and ensure
that proper protective measurement.
Chemical Loading/Unloading Areas
• Cover chemical loading/unloading areas and store chemicals
indoors, when possible.
• Provide diversion berms, dikes or grassed swales around the
perimeter of the area to limit run-on.
• Use containment curbs at chemical loading/unloading areas.
• Develop and implement spill prevention, containment, and
countermeasure (SPCC) plans.
• Train employees in spill prevention, control and cleanup.
• Personnel familiar with spill prevention and response procedures
should be present during unloading to ensure that any leaks or spills
are immediately contained and cleaned up.
Miscellaneous Loading/Unloading
• Confine loading/unloading activities to designated areas outside
drainage pathways and away from surface waters.
• Inspect containers for leaks or damage prior to loading/unloading.
• Avoid load inglunloading materials in the rain or provide cover or
other protection for loading docks.
• Provide diversion berms, dikes or grassed swales around the
perimeter of the area to limit run-on.
• Cover loading and unloading areas and perform these activities on
an impervious pad to enable easy collection of spilled materials.
• Slope the impervious concrete floor or pad to collect spills and leaks
and convey them to proper containment and treatment.
• Regularly sweep area to minimize debris on the ground.
Oil Bearing Equipment/Switchyards
• Construct level grades and gravel surfaces to retard flows and limit
the spread of spills.
• Collect stormwater runoff in perimeter ditches.
Vehicle and Equipment Maintenance
Good Housekeeping
• Eliminate floor drains that are connected to the storm or sanitary
sewer; if necessary, install a sump that is pumped regularly.
Collected wastes should be properly treated or disposed of by a
licensed waste hauler.
• Do all cleaning at a centralized station so the solvents stay in one
area.
Page 30 of 53

r :DUKE
V ENERGY.
Location: Marshall Steam Station
SDO Narrative Description and BMP Summary Permit No. NCS000548
• Use drip pans, drain boards, and drying racks to direct drips back
into a fluid holding tank for reuse.
• Drain all parts of fluids prior to disposal. Oil filters can be crushed
and recycled.
• Promptly transfer used fluids to the proper container; do not leave
full drip pans or other open containers around the shop. Empty and
clean drip pans and containers.
• Clean up leaks, drips, and other spills without using large amounts
of water. Use absorbents for dry cleanup whenever possible.
• Do not pour liquid waste into floor drains, sinks, outdoor storm drain
inlets, or other storm drains or sewer connections.
• Maintain an organized inventory of materials.
• Eliminate or reduce the number and amount of hazardous materials
and waste by substituting nonhazardous or less hazardous
materials.
• Label and track the recycling of waste material (e.g., used oil, spent
solvents, batteries).
• Store batteries and other significant materials inside.
• Dispose of greasy rags, oil filters, air filters, batteries, spent coolant,
and degreasers in compliance with RCRA regulations.
Minimizing Exposure
• Perform all cleaning operations indoors or under covering when
possible. Conduct the cleaning operations in an area with a concrete
floor with no floor drainage other than to sanitary sewers or
treatment facilities.
• If operations are uncovered, perform them on a concrete pad that is
impervious and contained.
• Check vehicles closely for leaks and use pans to collect fluid when
leaks occur.
Management of Runoff
• Use berms, curbs, or grassed swales other diversion measures to
ensure that stormwater runoff from other parts of the facility does not
flow over the maintenance area.
Inspections and Training
• Inspect the maintenance area regularly to ensure BMPs are
implemented.
• Train employees on waste control and disposal procedures.
Page 31 of 53

.DUKE
ENERGY
Location: Marshall Steam Station
SDO Narrative Description and BMP Summary Permit No. NC5000548
OutfallID: SW008 i "- J"
Discharge Structure: 8"CMP
Location: Intake canal, north
side of intake structure
Latitude-Longitude: 35°35'53", 80057'50"
Drainage Area: 0.1 acres
Percent Impervious: 70%
Permit Monitoring Table 5 A
Table:
Industrial Activities The SWOOS drainage area is comprised primarily of paved roadway and
and Description: yard area on the east side of the Powerhouse. Approximately 70 percent of
this area is paved with a small vegetated area located immediately adjacent
to the intake canal. SW008 discharges into a vegetated strip and then flows
into the intake canal.
Significant None
Materials/Potential
Pollutants:
BMP Summary:
• Regularly sweep area to minimize debris on the ground.
Page 32 of 53

DUKE
ENERGY.
Location: Marshall Steam Station
SDO Narrative Description and BMP Summary Permit No. NCS000548
Outfall ID: SW011
Discharge Structure, 24" CMP
Location: South bank of M r' ;
discharge canal, south y_•.
of discharge structure w. ,
Latitude -Longitude: o a�
35°35'43", 80 57'52"
7f
Drainage Area: Y
5.4 acres u -u "► ,
Percent Impervious: 5/o a
Permit Monitoring Table 7
Table: •,
Industrial Activities The drainage area includes the plant entrance from Hwy 150, the area
and Description: surrounding the plant raw water storage tank on the west side of the plant
entrance road (which is known to continuously leak/have flow), the majority
of the entrance and exit drives of the fuel unloading area and a vegetated
area southwest of and connecting to the discharge canal. Approximately
150 feet of the covered FGD limestone and gypsum conveyors crosses
through the drainage area.
Significant Gypsum and Limestone: Approximately 150 linear feet of the covered FGD
Materials/Potential limestone and gypsum conveyors cross through
Pollutants: the SW011 drainage area.
BMP Summary: Fugitive Dust Emissions
• Establish procedures to minimize offsite tracking of dust.
Page 33 of 53

DUKE
ENERGY
Location: Marshall Steam Station
SDO Narrative Description and BMP Summary Permit No. NC5000548
Outfall ID: SW012
Discharge Structure: 18" HDPE
Location: Southern end of intake
canal
Latitude - Longitude: 35'35'50", 80'57'47"
Drainage Area: 2.0 acres
Percent Impervious: »r �
Permit Monitoring
Table:
Table 8 � ��.•, _�•' _. `_: �_
Industrial Activities The SW012 drainage area is comprised of graveled yard, articulated
and Description: concrete block areas, and vegetated slopes located north and west of the
FGD facility (east of the Powerhouse) near the scrubber vicinity. The FGD
facility ductwork crosses over the southern end of the drainage area.
Significant Inert Materials: Various quantities of construction materials
Materials/Potential including valves, piping and other inert materials
Pollutants: may be stored on the gravel storage area north of
the FGD at various times.
BMP Summary: Fugitive Dust Emissions
Establish procedures to minimize offsite tracking of dust.
Material Storage Areas
• Control leakage or spillage from vehicles or containers and ensure
that proper protective measurement.
• Cover material with a temporary covering made of polyethylene,
polyurethane, polypropylene, or hypalon.
• Provide diversion berms, dikes or grassed swales around the
perimeter of the area to limit run-on.
• Construct an enclosure or build a berm around the area.
• Regularly sweep area to minimize debris on the ground.
• Train employees in spill prevention, control, cleanup and proper
materials management techniques.
Page 34 of 53

DUKE
' ENERGY,
Location: Marshall Steam Station
SDO Narrative Description and BMP Summary Permit No. NC5000548
Outfall ID: SW022
Discharge Structure: 18" HDPE --
Location: North bank of
dischar ecanal " :
Latitude -Longitude:
35°35'44", 80o 57'52"
Drainage Area:
0.8 acres ��„'�•
Percent Impervious: 0 % -n ,• ' f 'i
Permit Monitoring Table g
Table:
Industrial Activities The SW022 drainage area is comprised of a portion of the paved FGD
and Description: facility access road, paved road ditch, gravel laydown and vegetated 1
wooded embankment slopes.
Significant
Materials/Potential None.
Pollutants:
BMP Summary: Fugitive Dust Emissions
• Establish procedures to minimize offsite tracking of dust.
Delivery Vehicles
• Wash vehicles before they leave the site in a designated area where
wash water can be controlled.
• Develop procedure for the inspection of all vehicles arriving on the
plant site and ensure overall integrity of the body or container.
Page 35 of 53

. DUKE
+. ENERGY,
Location: Marshall Steam Station
SDO Narrative Description and BMP Summary Permit No. NCS000548
OutfallID: SW025
:tits ,,'•
Discharge Structure: 2—24" HDPE
Location: Upgradient of drainage
�- -
ands
Latitude- Longitude: 35°35'44", 80°57'52"
Drainage Area: -
222.Eacres .�,:,.;:•-�, .�.,,:_-:.- °a
Percent impervious: 0
Permit Monitoring
NSA 1 New Outfall
Table:
Industrial Activities The SW025 drainage area is comprised of offsite drainage into the site from
and Description: the southwest and industrial stormwater from the structural fill 1 landfill
collection area and Soil Borrow Area 3. These flow are collected within an
onsite pond north of the ash basin/decanting area and pumped north and
east to the drainage area pond, which is riprapped and through the outfall.
This area was historically forested until 2025 and has now been cleared,
graded, and stabilized with grass.
Significant Inert Materials: Various quantities of construction equipment,
Materials/Potential stockpiles of gravel or dirt, truck trailers, and other
Pollutants: inert materials may be stored on the gravel storage
area at various times. Sediment from various
construction activities upgradient of drainage area.
BMP Summary: Sediment
• Riprap lined pond for sump 1 settling
Fugitive Dust Emissions
• Establish procedures to minimize offsite tracking of dust.
Material Storage Areas
• Control leakage or spillage from vehicles or containers and ensure
that proper protective measurement.
• Cover material with a temporary covering made of polyethylene,
polyurethane, polypropylene, or hypalon.
• Provide diversion berms, dikes or grassed swales around the
perimeter of the area to limit run-on.
• Construct an enclosure or build a berm around the area.
• Regularly sweep area to minimize debris on the ground.
• Train employees in spill prevention, control, cleanup and proper
materials management techniques.
Page 36 of 53

DUKE
ENERGY
Location: Marshall Steam Station
SDO Narrative Description and BMP Summary Permit No. NCS000548
Outfall ID: SW026
Discharge 24" HDPE 'II
Structure:
Location: Downgradient of
drainage ponds
Latitude- 35' 36'53.41"N
Longitude:
80' 57'40.95"W _
Drainage Area:
90 acres t ,
Percent Impervious: 0%
Permit Monitoring
SW026
Table: 4
Industrial Activities The SW026 drainage area is comprised of offsite drainage into the site from
and Description: the northeast, capped landfills, new ash haul road, Soil Borrow Area 3 and
active landfill collection areas. These flows are collected within an onsite
retention basin (MAR-152)and pumped through a drainage pipe leading
downhill to a riprap-lined retention area (plunge pool) before discharging
through a forested area to a cove of the Catawba River(Lake Norman).
Significant Inert Materials: Various quantities of construction equipment,
Materials/Potential stockpiles of gravel or dirt, truck trailers, and other
Pollutants: inert materials may be stored on the gravel storage
area at various times. Sediment from various
construction activities upgradient of drainage area.
BMP Summary: Sediment
• Riprap lined pond for sump 1 settling
Fugitive Dust Emissions
• Establish procedures to minimize offsite tracking of dust.
Material Storage Areas
• Control leakage or spillage from vehicles or containers and ensure that
proper protective measurement.
• Cover material with a temporary covering made of polyethylene,
polyurethane, polypropylene, or hypalon.
• Provide diversion berms, dikes or grassed swales around the
perimeter of the area to limit run-on.
• Construct an enclosure or build a berm around the area.
• Regularly sweep area to minimize debris on the ground.
• Train employees in spill prevention, control, cleanup, and proper
materials management techniques.
Page 37 of 53

Duke Energy Marshall Steam Station I Stomviater Podumn Prevpaux n Plan
Stomwoter P61ution Prevemw Plan-Storrmrater Managerne-nt S=egy
2.2 Stormwater Management Strategy
2.2.1 Feasibility Study (Part 11, Section A.2(a))
This section provides a review of the technical feasibility of changing the methods of operations
and/or storage practices to eliminate or reduce exposure of materials and processes to rainfall
and run-on flows. Below are descriptions of the existing operations where coal, limestone, coal
combustion residuals (CCR)(e.g. bottom ash,fly ash)and gypsum present potential for
contamination of stormwater runoff. A description of fuel oil unloading operation is also included.
These descriptions demonstrate the current practices in use to prevent exposure of storage
areas, material handling operations and fueling operations.
22.1.1 COAL
Coal is delivered to the site via rail car and released into an underground hopper at the covered
rail car dumper facility. The coal is transported through a covered conveyor to the coal pile
where it is stored until ready for use.When ready for use the coal is transported through a
covered conveyor system across the general yard area into the powerhouse.
The rail car dumper process is enclosed therefore the processing of the coal is not exposed to
rainfall. The conveyors across the general yard area surrounding the powerhouse are covered
and protected from rainfall to reduce exposure for contamination with runoff. Runoff in the area
of the covered conveyors near the powerhouse is captured in the wastewater treatment system
conveyance system. The coal pile has a surface area of approximately 40 acres. It is not
practical to cover the coal pile from exposure to rainfall. Stormwater from the coal pile storage
area enters perimeter ditches that discharge to the holding basin which discharges into the LRB.
22.1.2 LIMESTONE
Crushed limestone is delivered to the site via rail car and released into an underground hopper
at the covered limestone rail car dumper facility. The limestone is transported through covered
conveyors and placed in the limestone stacker area. The limestone is scooped with construction
equipment and dumped in a hopper. The limestone is then transported through a covered
conveyor system across the site extending from the limestone stacker area south towards the
plant entrance,turning east and extending to the bail mill for processing and use in the FGD
facility.
The rail car dumper process is enclosed;therefore,the processing of the limestone is not
exposed to rainfall.The conveyors are provided with a cover to protect the material from
exposure to rainfall.Where the conveyors cross over roadways or waterways they are also
protected with an encasement to prevent spillage.The limestone stacker area has a surface
area of approximately 1.8 acres. tt is not practical to cover the limestone storage pile from
exposure to rainfall. Provisions are in place to capture runoff from the limestone stacker area
and route it through a settling basin before ultimately sending it to the LRB.
22.1.3 BOTTOM ASH
Bottom ash is sluiced(pumped with water)from the powerhouse within sealed piping to the
submerged flight conveyor system. The contact water is decanted from the slurry and ultimately
flows to either the FGD system or the LRB. Bottom ash is dredged from settling tanks and
Page 38 of 53

Duke Energy Marshall Steam Station I Stormwater Poduton Prewr bon Pian
Stour»cater Poduton Preverwn Plan-StomTwatef Management Strxegy
deposited on a concrete containment for decanting. Bottom ash may be beneficially reused or
disposed of in Marshall's active landfill.
All processes Involving bottom ash up to the point of disposal are covered and exposure to
stormwater is limited. The bottom ash processing area is approximately 35 acres. It is not
practical to place a cover over the extents of the bottom ash processing area. Al stormwater
captured in the bottom ash processing remains in the LRB dosed-loop system as makeup water
or is processed through the FGD.
2.2.1.4 FLYASH
Fly ash is a product of the coal generation process and is transported from the powerhouse by
sealed piping in a dry form via forced air. The fry ash is stored in covered silos for transport to
the ash landfill. Fly ash is loaded from the silos into dump trucks and transported through
interior plant roads to the ash landfill.
All processes involving fly ash up to the point of hauling are covered and exposure to
stormwater contamination is limited.The areas affected by fly ash hauling are too large and
linear(haul roads)for covering the area to be feasible. The ash silo and plant haul road
drainage areas have provisions in place that route runoff to the LRB system. Provisions are in
place to keep these impacted areas to a minimum, such as run-on controls surrounding the ash
silo area and haul roads leading up the ash basin dike.
22.1.5 GYPSUM
Gypsum is a product of the FGD facility.The gypsum slurry is first passed through a solidsniquid
separation facility. The liquid is transported to a water treatment facility and ultimately
discharged through the LRB.The solids are directed to a conveyor system for transport to the
gypsum stacker area where the gypsum is stored before being loaded into trucks. The product
Is hauled offsite for beneficial reuse or hauled to the ash landfill.
All processes involving separation of gypsum and wastewater at the FGD are covered and
exposure to stormwater contamination is limited. The conveyors are provided with a cover to
protect the material from exposure to rainfall during transit to the stacker area. Where the
conveyors pass roadways or waterways they are additionally protected with an encasement to
prevent spillage.The gypsum slacker area has a surface area of approximately six acres and
the ash landfill area is approximately 15 acres.The gypsum stacker area is elevated to prevent
run-on from upland areas. Runoff generated at the gypsum stacker flows to a sediment pond
and ultimately discharges through the LRB.The ash landfill is within the LRB drainage area. It is
not practical to place a cover over the extent of the gypsum stacker area or the ash landfill to
limit exposure to rainfall. Provisions are in place to capture runoff and convey it for treatment in
the LRB.
22.1.6 FUEL OIL
Fuel oil is stored on-site for generation system startup and other purposes. Storage tanks are in
place with secondary containment berms and the surrounding area runoff is captured in the LRB
system. Fuel unloading occurs in an upland area near the entrance to the plant where fuel oil is
unloaded from tanker trucks and sent through sealed piping to the storage tanks.When ready
for use the fuel oil is transported through piping into the powerhouse.
Page 39 of 53

Duke Energy Marshall Steam Station I S:om vzter PoWton Prevemon Plan
frr Stomarer Pollution Prevemw Plan-Stcffmvatef M.anagen-p-M Strategy
The concrete area where fuel oil is unloaded from tankers has curbing and drainage collection
points routed to the main fuel oil storage tank secondary containment area. The main fuel oil
storage tanks are surrounded by a containment berm. The berm is drained to the LRB system
by a manually operated siphon. Collected rain water can be drained following inspection of the
containment contents. The area surrounding the concrete fuel unloading pad is graded such
that run-on Is diverted elsewhere. Installing a cover over the fuel unloading area is not practical
based on how this area is operated. Fuel unloading does not occur frequently;therefore,
Installing a cover would not provide a reasonable risk reduction. A feasible option to further
Improve operation would be to Install a gate valve on the common header drainage pipe from
the fuel unloading area.This would allow isolation of spills and facilitate dean up.
Duke Energy is actively pursuing strategies to holistically manage the exposure of stormwater to
power generation,waste disposal, and facility management operations. These efforts will
consider the technical and economic feasibility of changing the methods of operations and/or
storage practices.The details from the planning, design, and construction of such improvements
shall be incorporated into the SPPP upon completion.
2.2.2 Secondary Containment Requirements and Records(Part II, Section A.2(b))
The station manages numerous oil-based liquids and non-oil based liquids and chemicals which
are critical to power generation and transmission, waste handling and treatment, and operation
of vehicles and equipment used onsite. Given the quantity of the oil kept onsite at any time, a
Spill Prevention, Control, and Countermeasures(SPCC)Plan pursuant to U.S. Environmental
Protection Agency(EPA)Oil Pollution Prevention Regulation, 40 CFR Part 112 is maintained
onsite.This plan covers secondary containment requirements and record keeping for an oil-
based liquids as defined by the regulation.A copy of the SPCC is not included in the SPPP as
the document is actively managed at all times for evolving site conditions; however, a current
version is maintained in the office of the Site Environmental Coordinator and referenced herein.
Secondary containment shall be required for all other non-ail based liquids and chemicals
pursuant to this section of the permit to prevent leaks and spills from contaminating stormwater
runoff. Secondary containment shall be sized for the contents of the largest tank within the
containment structure plus sufficient freeboard to contain the 25-year, 24-hour storm event
where exposed to rainfall. If the secondary containment devices are connected to stormwater
conveyance systems,the connection shall be controlled by manually activated valves or other
similar devices(which shall be secured dosed with a locking mechanism).Accumulated
stormwater in secondary containments as a result of rainfall or runoff shall be observed and
found to be uncontaminated by any material prior to release however,the station does not have
any permanent containments that drain to SDOs. Instead, all containments currently drain to
the yard sump systems and ultimately to the LRB.
All secondary containments shall be inspected to coincide with the frequency established by the
SPCC Site Inspection Log and other Duke Energy policies. Inspections will include observation
for leaks, condition of containment,valve drain closure and locking, and presence of excessive
debris and sediment. These reports shall be entered into Plantview. Exterior containment basins
Page 40 of 53

Duke Energy Marshall Steam Station I Storrmw..er Pollution Prevert�on Plan 0
Stomrrrater Potiuticn Prevenzon Plan-Stc"mrater Management S=egy V—.�
with exposure to rainfall are inspected after significant rainfall events.These inspections can be
scheduled through e-TRAC to ensure they are performed and documented.
A list of all liquids and chemicals and their associated secondary containment areas is provided
in Appendix F. Example documentation for periodic inspections for leaks and recordation of
accumulated stormwater releases are placed in Appendix G.
2.2.3 BMP Summary(Part 11, Section A.2(c))
A number of best management practices are currently in place at the station.These BMPs were
Instituted over a number of years as a result of various regulatory drivers and good
housekeeping objectives.While a chosen practice provides some level of pollution prevention
as it relates to the management of stormwater discharges under this permit,the historic
rationale behind implementing such a practice is comprehensive of a number of contributing
factors.To document the ongoing implementation of these practices as part of the SPPP,Table
2 from the Industrial Stomnwater Fact Sheet for Steam Electric Power Generating Facilities
(EPA-833-F-06-030)was reviewed and evaluated(provided in Appendix B).A high-level review
of the BMPs is provided below along with a rationale for implementing them.The detailed listing
of these BMPs for each drainage area is provided in the SDO descriptions in the appendix
where Information regarding the industrial activities and significant sources of pollutants are also
compiled. The compiled information in the appendix captures an ongoing assessment process
for BMP selection and implementation.
The Site Environmental Coordinator shall rely on Table 2 from EPA-833-F-06-030 for the
improvement, installation and implementation of BMPs to address data collected through
monitoring of MOS.The Site Environmental Coordinator may also rely on other sources of
information to Implement other appropriate BMPs not listed in Table 2. This list of BMPs shall be
reviewed and updated annually as new practices are incorporated in the plan or warranted as a
result of exceedances of analytical monitoring benchmarks.
22.3.1 COAL PILE MANAGEMENT
Rainfall and upland stormwater may be contaminated as it is exposed to the coal piled not
managed property. The coal pile at the station is bermed on all sides limiting the potential for
run-on and directing coal pile runoff to the east-or west-coal yard ponds that discharges to the
holding basin for treatment and then to the LRB.
22.32 FUGITIVE DUST EMISSIONS
The potential for fugitive dust to move offsne or into drainage areas with no stormwater or sump
controls drives the need for emission management practices. The station maintains an air
permit with NCDEQ that includes the control of fugitive dust emisslons as a programmatic
requirement. Fugitive dust emissions originating from a variety of sources are to be maintained
to the Best Available Control Technology emission limits for Particulate Matter with Nominal
Aerodynamic Diameter of 10 Micrometers or Less(PM,o). Fugitive dust emissions are managed
through a variety of practices including negative pressure conditions during raw material
unloading,watering of fine particulate materials prior to transport, periodic wetting of haul roads,
paving of heavily used gravel surfaces,fire and vehicle wash stations, and wetting of placed
landfill material. Contractors may be assigned at any time to perform services that generate
Page 41 of 53

Duke Energy rdarsUl Steam Station I S'xmvrater Pollution Prevention Plan `�j
Stomvrater Poiution Prevention Plan-Stortmvater Management Strategy 3— `�
fugitive dust related to hauling or construction. As a result, fugitive dust control is typically a
contractual requirement of all contracted work
2.2.3.3 FUEL OIL UNLOADING/CHEMICAL LOADING AND UNLOADING/MISCELLANEOUS
LOADINGIUNLOADING
The station maintains numerous locations for the loading and unloading of oil and non-oil liquids
and chemicals. The potential for spills and leaks to release to storm drains or overland drainage
pathways to receiving waters presents a source for an unauthorized discharge and
contamination of stormwater discharges. Loading/unloading operations follow typical spill
prevention and control practices and adhere to the Department of Transportation's
unloadinglloading procedures(49 CFR Part 177, Subpart B). Additional BMPs include training,
attendance of a qualified individual during transfer, use of tank level indicators, maintenance of
spill kit resources nearby, and the use of transfer containment devices. For number of these
transfers, an olWrater separator or yard drainage system with a sump is located down gradient
to capture spills and leaks for cleanup and prevent them from being discharged directly to
receiving waters.
22.3.4 LIQUID STORAGE TANKS/LARGE BULK FUEL STORAGE/ABOVE GROUND TANKS
The station maintains numerous storage tanks for oil and non-oil liquids and chemicals. The
potential for spills and leaks to release to storm drains or overland drainage pathways to
receiving waters exist and presents a source for an unauthorized discharge and contamination
of stormwater discharges. The station relies on a variety of practices to reduce exposure of leak
and spills to stormwater discharges. They include the use of valve controlled and secured
secondary containment systems, secured perimeters and barriers to prevent accidental damage
and vandalism to tanks, level Indicators and gauges to detect leaks, lighting, routine disposal
schedules, readily available spill kits and materials, and active SPCC plan development,
implementation, and training. For a number of these tanks, a yard drainage system with a sump
is located dawn gradient to capture spills and leaks for cleanup and prevent them from being
discharged directly to receiving waters.
22.3.5 OIL BEARING EQUIPMENT SVYfTCHYARDS
There is one switchyard at the station near the powerhouse and numerous oil bearing
equipment(e.g.transformers)located at various places throughout the station to support
operations. The potential for spills and leaks to release to storm drains or overland drainage
pathways to receiving waters exist and presents a source for an unauthorized discharge and
contamination of stormwater discharges. The station relies on the use of secondary
containments around transformers and oil/Water separators down gradient of switchyards to
intercept significant spills. These containments are inspected regularly and accumulated
stormwater is inspected before being discharged. In addition, the switchyard is graded with
minimal slope, covered with gravel surfaces and lined with perimeter ditching to reduce the
conveyance of spills and provide for areas of collection.
22.3.6 RESIDUE HAULING VEHICLES/ASH LOADING AREAS
Fly ash stored in covered silos is loaded into dump trucks and transported to the ash landfill
onsite. Gypsum is loaded into dump trucks and transported offsde. Both materials have the
potential to spill from trucks or be carried away as dust, thereby contaminating surfaces that
Page 42 of 53

Duke Energy Marshall Steam Station I Stomnater Pdluton Prevention Plan
Stomw ater Pohmrni Prevention Ran-Sp6 Prevention and Response Prooedures
may be later exposed to stormwater runoff.The materials are wetted prior to loading to prevent
dust emissions and truck coverings are used for hauling offsite where material may dry in
transit. Loading areas are regularly washed down with wash water and drained to a settling
basin prior to discharge to the ash basin through the sump system.The discharges from these
loading areas are located within the yard drainage system that convey runoff and wash water to
the LRB.This keeps loading areas free from dust generation. Truck wheel wash stations are
located in loading and unloading areas and used to limit the transport of residue to haul roads.
22.3.7 VEHICLE AND EQUIPMENT MAINTENANCE
Vehicles and equipment have the potential to leak or spill significant quantities of fuel, hydraulic
fluids, and oils if not property maintained and operated.There is potential for unauthorized
discharges as the vehicles and equipment operate near storm drains. Maintenance is performed
on a routine basis to keep vehicles and equipment operational thereby reducing the potential for
spills and leaks from mechanical failure.To the extent practicable, maintenance is performed
offsite at commercial facilities that are subject to local laws and regulations regarding the
disposal of used materials. When maintenance must be performed onsite, it is performed under
cover and with temporary containment devices used to capture emptying of fluids. Used
materials and parts are labeled and property disposed of in original containers or secured
packaging.Where spills or leaks do occur, spill kits are readily available for use.
22.3.8 MATERIAL STORAGE AREAS
Limestone, coal,fly ash, and gypsum are the bulk materials stored at the station. Exposure of
the materials to rainfall and stormwater run-on has the potential to contaminate stormwater
runoff. All materials except fly ash are stored outdoors in piles that are bermed to prevent run-on
or contained to drain to detention basins and/or sumps and subsequently to the LRB.
22.3.9 FUELING OPERATIONS
Fueling is performed in two distinct ways that has the potential to contribute to significant
quantities of pollutants. Lighter, all purpose vehicles and equipment such as cars and trucks are
fueled from a stationary dispenser while heavier, dedicated equipment, such as earth moving
equipment are fueled by mobile dispensers in the areas where they are used. The potential for
spills and leaks to release to storm drains or overland drainage pathways to receiving waters
presents a source for an unauthorized discharge and contamination of stormwater discharges.
For the stationary fueling operations,the dispensary equipment is checked regularly for leaks
and functional operation. Spilt kits are located nearby for minor spills and leaks during fueling.
Mobile fueling operations are handled in the same way but typically a temporary containment is
set up to capture leaks and spills. Mobile fueling operations are mostly performed in areas with
yard drainage and sumps or leachate collection systems so ultimately they discharge to the
LRB.
A list of all currently utilized BMPs for each drainage area is provided on the fad sheets in
Appendix B.
Page 43 of 53

Attachment 3
Summary of Analytical Monitoring Data and Visual Observations
Page 44 of 53

r�DUKE SUMMARY OF LABORATORY ANALYSES
ENERGY. INDUSTRIAL STORMWATER
JUNE 2021-JUNE 2025
NPDES Stormwater Permit NCS000548
Marshall Steam Station
o,yQ
UNITS pH mg/L ug/L ug/L uglL mg/L ug/L ug/L ug/L ug/L ng/L ugfL ug/L ug/L ug/L mg/L mg/L mg/L
PERMIT BENCHMARK 6-9 15 90 340 65 ` 3 900 10 7S " 335 56 0.3 • 0.126 ANY 100
STORMWATER DATE OF TOTAL
OUTFALL COLLECTION RAINFALL
6/7/2021 0.59 7.2 <1 1,33 <1 <0.05 <1 2.54 3.23 1.46 12.1 <1 <1 <0.3 <0.2 0.057 35
3/16/2022 0.73 7.6 <1 <1 <1 <0.05 <1 <1 2.61 <1 3.06 1.16 1.42 <0.3 <0.2 OA21 7
9/30/2022 1.95 6.8 <1 <1 <1 <0.05 <1 <1 2.25 <1 3.68 1.02 <1 <0.3 <0.2 OAl2 3.2
12/14/2022 0.57 7.4 <1 <1 <1 <0.05 <1 <1 <2 <1 1.33 3.21 9.65 <0.3 <0,2 0.019 3.5
3/22/2023 0.08 6.8 <1 <1 <1 0.052 <1 1.11 2,87 <1 4.3 3.23 <1 <0.3 <0.2 0.028 6.6
6/19/2023 1.01 7.2 5,09 <1 <1 <0.05 <1 <1 2.56 <10 6.54 <1 <1 <0.3 <0.2 0.021 14
SW 002 12/17/2023 0.90 7.0 <1 <1 <1 <0.05 <1 1.61 2.72 <1 3.7 2.01 <1 <0.3 <0.2 0,027 15
2/27/2024 0.10 7.5 <1 2.94 <1 <0.05 <1 5.91 7.84 2.95 24 7.87 1.27 <0.3 <0.2 0.071 60
5/14/2024 0.70 7.0 <1 1.98 <1 0,056 <1 2.53 5.53 1.24 6.7 3.46 <1 <0.3 <0.2 p.027 26
9/16/2024 2,21 7.1 <1 1.53 <1 <0.05 <1 <1 3.71 <1 7-8 3.1 <1 <0.3 0.205 0.028 5.1
11/14/2024 1.13 6.6 <1 <1 <1 <0.05 <1 1.26 2.55 <1 3.5 15.6 <1 <0.3 <0.2 0.028 13.0
3/16/2025 0.38 6.8 <1 2.7 <1 <0.05 <1 3.41 7.22 1.92 14/13 jI,86
1.32 <0.3 <0.2 0.075 7
6/5/2025 0.84 6.9 <1 1.22 <1 <0.05 <1 <1 2.24 <1 3.3 <1 <0.3 <0.2 0,019 7.7
6/7/2021 0.59 7.8 <1 3.76 <1 <0.05 <1 7.75 13.9 6.25 13.5 2.2 <0.3 0.257 0.059 130
3/16/2022 0.73 7.7 <1 2.58 <1 <0.05 <1 2.04 2.94 1.2 9-02 <1 <0.3 <0,2 0.025 12
9/30/2022 1.95 7.3 <1 1.01 <1 <0.05 <1 <1 2.34 <1 4.66 <1 <0.3 <0.2 0.012 3.1
12/14/2022 0.57 7.3 <1 3.69 <1 0.062 <1 5.04 6.81 2.84 20.3 6.25 <0.3 0,207 0.065 76
6/19/2023 1.61 7.1 <1 2.25 <1 <0.05 <1 1.91 3.38 1.21 12.8 <1 <0.3 <0.2 0.027 22
12/17/2023 0.90 7.5 <1 <1 <1 <0.05 <1 1.74 <2 <1 3.6 <1 <1 <0.3 <0.2 0.012 4.6
SW003 2/27/2024 0.10 7.4 <1 5.64 <1 <0.05 <1 10.1 9.57 3.71 34 6.82 1.92 <0.3 0.226 0.094 == 85
3/27/2024 0.26 7.5 <1 4.61 <1 0.069 <1 5-1 7.13 2.66 20/22 4.61 1.36 <0.3 <0.2 0-04 74
5/14/2024 0.70 7.3 <1 3.04 <1 0,056 <1 2.71 3.6 1 1.17 8.3 1.82 <1 <0.3 <0.2 0.015 40
8/13/2024 1 0.27 7.3 <1 2.68 <1 <0.05 <1 Z A' 3.64 1.23 8.8 2.06 <1 <0.3 <0.2 <0.015 33
9/16/2024 2.21 7.3 <1 3.38 <1 <0.05 <1 2.1 4.06 1.07 10 1.64 1.82 <0.3 <0-2 0.023 20
11/14/2024 1.13 6.8 <1 1.78 <1 <0.05 1 <1 1.3 <2 <1 4.8 1.06 <1 <0.3 <0.2 0,017 7.2
3/16/2025 0.38 7.2 1.04 4.1 <1 <0.05 <1 3.96 6.11 2.25 15/13 3 1.S <0.3 <0.2 0.048 38
6/5/2025 0.84 7A - <1 I. <1 <0.05 1 <1 1.09 <2 <1 4.8 <1 <1 <0.3 <0.2 0.018 11
Page 45 of 53 www.duke-energy.com

frus DUKE SUMMARY OF LABORATORY ANALYSES
ENERGY, INDUSTRIAL 5TORMWATER
J U N E 2021-J UN E 2025
NPDE5 Stormwater Permit NCS000548
Marshall Steam Station
e
UNITS pH mg/L ug/L ug/L ug/L mg/L ug/L ug/L ug/L ug/L ng/L ug/L ug/L ug/L ug/L mg/L mg/L mgA
PERMIT BENCHMARK 6-9 15 90 340 65 3 900 10 75 ** 335 56 0.3 * 0.126 ANY 100
STORMWATER DATE OF TOTAL
OUTFALL COLLECTION RAINFALL
6/7/2021 0.59 7.2 <4.9 <1 <1 <1 <0.05 <1 <1 GAB <1 5.20/5.24 <1 I <1 <0.3 <0.2 0.151 - 8.9
3/16/2022 0.73 8.0 <4.8 <1 <1 <1 <0.05 <1 <1 2.95 <1 4.86/3.38 3.38 <1 <0.3 <0.2 0.098 3.6
9/30/2022 1.95 7.0 <4.8 <1 <1 <I <0.05 <1 <1 2.6 <1 4.20/4.15 1.38 <1 <0,3 <0.2 0.046 IO
12/14/2022 0.57 7.5 <4.9 <1 <1 <1 <0.05 <1 <1 <2 <1 3.79/3.87 1.11 <1 <0.3 <0.2 0.066 11
3/22/2023 0.08 7.4 <5.0 • <1 <1 <1 <0.05 <1 2.02 2.52 <1 113/12.2 2.24 1.48 <0.3 <0.2 0.074 7.7
6/19/2023 1.01 _6.9 <5.0 <1 <1 <1 <0.05 <1 <1 3.23 <1 6.78/7.00 2.34 <1 <0.3 <0.2 0,117 <2.5
5 WO07 12/17/2023 0.90 1 7.4 11 <2.4 <1 <1 <1 0.051 <1 <1 3.44 <1 2.5/2.6 <1 <1 <0.3 <0.2 0.063 2.6
2/27/2024 0.10 7.2 <2.6 <I <I <1 <0.05 <I <I <2 <1 1-4/1.4 1,42 1.15 1 <0.3 <0.2 0.054 <2.5
5/14/2024 0.70 7.2 <2.6 <1 <I <1 <0.05 <1 <1 <2 <1 3.013.0 1,54 <1 <0.3 <0.2 0.050 6
9/16/2024 2.21 7.1 <2.7 <1 1.11 <I <0.05 <1 2.38 6.49 1-88 5.7 3.68 1 333 <0.3 <0.2 0.117 48
11/14/2024 1.13 6.7 <2.5 <I <I <I <0.05 <1 1.19 2.31 <1 4.8 1.7 1,11 <0,3 <0.2 0.055 5.3
3/16/2025 0.38 7.0 <5.3 <1 <1 <1 <0.0$ <1 <1 <2 <1 2.3/2.2 1.81 1 <03 <0.2 0.099 <2.5
6/5/2025 0.84 7.2 <5 <1 <1 <1 <0,05 <1 <1 2.80 <1 3.0/3.1 1.46 <1 <0.3 <0.2 0.075 <2.5
6/7/2021 0.59 7.4 - 7.9
3/16/2022 0.73 8.6 - 13
9/30/2022 1.95 6.8 8.8
12/14/2022 0.57 7.2 40
3/22/2023 0.08 7.0 - 23
6/19/2023 1 1.01 7.1 - 29
SWo08 12/17/2023 0.90 7.5 13
2/27/2024 0.10 7.3 - - - 23
5/14/2024 0.70 7.2 - - 24
9/16/2024 2.21 7.2 - 24
11/14/2024 1.13 1 6.7 - - - 38
3/16/2025 0.38 6.6 - - 46
6/5/2025 1 0.84 7.1 26
Page 46 of 53 www,duke-energy.com

.� 'DUKE SUMMARY OF LABORATORY ANALYSES
ENERGY. INDUSTRIAL STORMWATER
JUNE 2021-JUNE 2025
NPOES Stormwater Permit NCS000548
Marshall Steam Station
e
ma
�F ca
4T �F mC roc aF �oF QQ as ��o v^� sec aye ;p c my yQz ay
o° cP L� L° .¢ 2 y` �r e i,
UNITS pH mg/L ugJL ug/1 ug/C mg/L ug/L ug/C ug/C ug/L ng/L ug/L ug/L ug/1 ug/L mg/L mg/L mg/L
PERMIT BENCHMARK 6-9 15 90 340 cis " 3 900 10 75 •• 335 56 0.3 ' 0.126 ANY 100
STORMWATER DATE OF TOTAL
OUTFALL COLLECTION RAINFALL
6/7/2021 0.59 7.0 <1 <1 1
5.62
2.74 -- -- --
3/16/2022 0.73 7.2 <1 2.56 1.51 - D.0747 33
12/14/2022 0.57 6.9 <1 1.22 <1 Q.0248 18
12/17/2023 0.90 7.4 <1 1.94 0.0504 -- 10
2/27/2024 010 7.4 <1 3.27 0.099 - 47
S W Ol l 5/14/2024 0.70 7.6 - <1 <1 1.26 0.0115 4.6
9/16/2024 2.21 7.4 - <1 <1 <1 - - 0.0701 4.2
11/14/2024 1.13 6.8 - <1 1.88 3.24 0.0227 - 21
3/16/2025 0.38 7.2 <1 2.56 1.57 - 0.0958 - 36
6/5/2025 0.84 6.8 <1 2.15 <1 0.0461 6.2
6/7/2021 0.59 7.6 -- - 19
3/16/2022 0.73 7.1 26
9/30/2022 1.95 7.2 - 14
12/14/2022 0.57 6.9 - 28
6/19/2023 1.01 6.7 - - - - 12
SWO12 12/17/2023 0.90 7.1 - - 18
5/14/2024 0.70 6.4 - - - 13
9/16/2024 2.21 7.4 - 29
11/14/2024 1.13 6.4 - 60
3/16/2025 0.38 6.7 -- -- -- -� -- -- -- -- -- -- -- -- -- -- -- 14
6/5/2025 0.84 6.4 - 57
Page 47 of 53
www.dulce-energy.com

DUKE SUMMARY OF LABORATORY ANALYSES
ENERGY. INDUSTRIAL STORMWATER
JUNE 2021-JUNE 2025
NPDES Stormwater Permit NCS000548
Marshall Steam Station
y
a`' •a F ya
UNITS pH mg/L ug/L ug/L ug/L mg/L ug/L ug/L ug/L ug/L ng/L ug/L ug/L ug/L ug/L mgA mg/L mg/L
PERMIT BENCHMARK 1 6-9 15 1 90 1340 65 " 3 900 10 75 ** 335 56 0.3 ' 0.I26 ANY 100
20
23
STORMWATER DATEOF TOTAL
OUTFALL COLLECTION RAINFALL
6/7/2021 0.59 7.4 -
3/16/2022 0.73 8.2 -
9/30/2022 1.95 7.3 -- - -- - -- - -- -- --
-
12/14/2022 0.57 7.4 - -
3/22/2U23 0.08 7.5 - - 8.5
6/19/2023 1.01 7.3 -- -- -- -- -- -- -- -- •- --
6.9
SW022 12/17/2D23 0.9 7.5 - 12
2/27/2024 0.10 7.5 - 10
5/14/2024 0.7 8.0 - 69
9/16/2024 2.21 7.5 - - 10
11/14/2024 1.13 7.1 - 27
3/16/2025 0.38 7.5 - - - - - - - - 48
6/5/2025 0.84 7.4
- - - 33
6/7/2021 0.59 7.5 39
3/16/2022 0.73 7.7 - <2.5
6/7/2022 0 7.4
8/29/2022 0 7.8 16
12/14/2022 0.57 7.9 -- -- -- -- -• -- -- -- - -- --
4.1
5WU25 2/27/2024 0.1 8.2 1 5.7
5/14/2024 0.7 7.6 - 5.8
9/17/2024 2.21 7.3 -- -- -- -- -- -- -- -- -- -
28
11/14/2024 1.13 7.5 - - <2.5
3/16/2025 1 0.38 7.6 - <2.5
6/5/2025 1 0.84 T6 5.7
Page 48 of 53 www.duke-energy.com

E SUMMARY OF LABORATORY ANALYSES
ENERINDUSTRIAL STORMWATER
JUNE 2021-JUNE 2025
NPDES Stormwater Permit NCS000548
Marshall Steam Station
m
4t F me Ci °c alb °F
UNITS pN mg/L ug/1 ug/L ug/L mg/L ug/L ug/L ug/L ug/L ng/L ug/L ug/L ug/L ug/L mg/L mg/L mg/L
PERMIT BENCHMARK 6-9 15 90 340 65 3 900 10 75 ** 335 56 0.3 • 0.126 ANY 10 I
STORMWATER DATE OF TOTAL
OUTFALL COLLECTION RAINFALL
3/16/2022 0,73 8.5 <1 <1 <I <0.05 <1 5.73 4,86 2.62 4.93 4.14 <1 <0.3 <0.2 0.007 - 35
12/14/2022 0.57 7.9 <1 <1 <1 <0.05 <1 1.41 2.77 <1 3.26 <1 <1 <0.3 <0.2 <0.005 - 5
6/19/2023 1-01 8.3 <1 1.05 <1 <0.05 <1 <1 <2 <1 5.44 <1 <1 <0.3 <0.2 <0.005 4.2
12/17/2023 0.9 7.2 <1 <1 <1 <0.05 <1 2.04 3.52 1.32 3.4 1,26 <1 <0.3 <0.2 <0.005 6.9
SWO26 9/17/2024 2,21 7.1 <1 1.43 <1 <0.05 <1 2.38 5.82 1.35 5.4 1.57 <1 <0.3 <0.2 <0.015 37
11/14/2024 1.13 6.3 <1 <1 <1 <0.05 <1 1.48 2.28 <1 3.0/5.O 1,14 < 1 <0,3 <0.2 <0.015 - 4.5
3/16/2025 0.38 153 I <1 1 1,13 1 <1 <0.05 <1 8.66 5.13 1 4.77 9.8 1 4,14 <1 <0.3 <0-2 <0.015 - 33
6/5/2025 D.84 7.2 <1 1.fi4 <1 <0.05 <1 5,26 5,47 2.9 6.4 3.17 <1 10.3 <0.2 <0.015 49
notes:
'NoBenchmark-Monitor Only
No Benchmark-Values.above NCDEQ standard of 12 ug/L should be noted but do not trigger Tier response
--Sample not anatyxed for parameter
Outfalls SWOOI,IA,SWO06,SW009 and SWO23 have either been abandoned or are covered by the NPDES wastewater permit. Therefore their results are not included.
Page 49 of 53 www,duke-energy.com

Site Contact: Scott LaSala
Phone Number: 828-478-7820
446) DUKE SUMMARY OF VISUAL QUALITATIVE MONITORING DATA
APRIL 2020- MARCH 2O25
ENERGY
NPDES Stormwater Permit NCO00548
Marshall Steam Station
STORMWATER OUTFALL SWO02 SW003 SWO07 SW008 SW011 SWO12 SW022 SWO25 SWO26
clear to clear to clear to clear to clear to clear to
clear clear clear
Color light gray light gray light gray light gray light brown light brown
Odor None None None None None None None None None
Clarity(Average) 1.5 2.3 1.6 2.3 1.4 1.5 2.2 1.4 1.5
Floating Solids (Average) 1.1 1.1 1.0 1.1 1.0 1.1 1.0 1.1 1.0
Suspended Solids (Average) 1.2 1.8 1.2 1.5 1.0 1.1 1.4 1.1 1.0
Visible Foam None None None None None None None None None
Visible Oil Sheen None None None None None None None None None
Indication of Erosion/Deposition None None None None None None None None None
Rain Event Accumulation (Average) 0.77 0.74 0.77 0.77 0.81 0.85 0.77 0.80 1.10
Outfall Status Active Active Active Active Active Active Active Active Active
Notes: Value assessment of 1-5 for Clarity, Floating Solids, and Suspended Solids. Values increasing upward by severity(1=Best Case and 5=Worst Case)

Attachment 4
Stormwater Pollution Prevention Plan
Development and Implementation Certification
Page 50 of 53

STORMWATER POLLUTION PREVENTION PLAN
DEVELOPMENT AND IMPLEMENTATION
CERTIFICATION
North Carolina Division of Energy, Mineral, and Land Resources—Stormwater Program
Facility Name: Matsrwasteae sw
Permit Number: ?4CS00054a
Location Address: 8329 East NC Hgnwey 150
Terrell.NC 28682
County: Catawba
"I certify, under penalty of law, that the Stormwater Pollution Prevention Plan (SPPP) document and all
attachments were developed and implemented under my direction or supervision in accordance with a system
designed to assure that qualified personnel properly gather and evaluate the information required by the SPPP.
Based on my inquiry of the person or persons who manage the system, or those persons directly responsible
for gathering the information, the information gathered is, to the best of my knowledge and belief, true,
accurate and complete."
And
"i certify that the SPPP has been developed, signed and retained at the named facility location, and the SPPP
has been fully implemented at this facility location in accordance with the terms and conditions of the
Stormwater discharge permit."
And
"I am aware that there are significant penalties for falsifying information, including the possibility of fines and
imprisonment for knowing violations."
Sign (according to permit signatory requirements) and return this Certification. DO NOT
SEND STORMWATER POLLUTION PREVENTION PLAN WITH THIS CERTIFICATION.
Signature Date
dg12-51�Zf,
M., Z,. Ganaral Pram snana0.,
Print or type name of person signing above Title
SPPP Certification 10/13
Page 51 of 53

Attachment 5
Supplemental Information Checklist
Page 52 of 53

SUPPLEMENTAL INFORMATION REQUIRED FOR RENEWAL OF INDIVIDUAL
NPDES STORMWATER PERMIT
Two copies of each of the following shall accompany this submittal in order for the application
to be considered complete:
(Do not submit the site Stormwater Pollution Prevention Plan)
Initials
�. 1. A current Site Map from the Stormwater Pollution Prevention Plan. The location of
industrial activities (including storage of materials, disposal areas, process areas and
loading and unloading areas), drainage structures, drainage areas for each outfall,
building locations and impervious surfaces should be clearly noted.
+✓ 2. A summary of Analytical Monitoring results during the term of the existing permit
(if your permit required analytical sampling). Do not submit individual lab reports.
The summary can consist of a table including such items as outfall number,
parameters sampled, lab results, date sampled, and stonn event data.
3. A summary of the Visual Monitoring results. Do not submit individual monitoring
reports. The summary can consist of a table including such items as outfall number,
parameters surveyed, observations, and date monitoring conducted.
7: L- 4. A summary of the Best Management Practices utilized at the permitted facility.
Summary should consist of a short narrative description of each BMP's in place at
the facility. if the implementation of any BMP's is planned, please include
information on these BMP's.
5. A short narrative describing any significant changes in industrial activities at the
permitted facility. Significant changes could include the addition or deletion of
work processes, changes in material handling practices, changes in material storage
practices, and/or changes in the raw materials used by the facility.
c�jl1 6. Certification of the development and implementation of a Stormwater Pollution
Prevention Plan for the permitted facility (Sign and return attached form).
If the final year analytical monitoring of the existing permit term has not been completed
prior to filing the renewal submittal, then the last years monitoring results should be submitted
within 30 days of receipt of the laboratory reports. (i.e. do not withhold renewal submittal
waiting on lab results)
Page 53 of 53