NC0004987_Renewal (Application)_20210329

f ti
(' DUKE Duke Energy
526 South Church Street
ENERGY_ Charlotte, NC 28202
Mailing Address
Mail Code EC13K/P.O. Box 1006
Charlotte, NC 28201-1006
0
March 29, 2021
Dr. Sergei Chernikov
North Carolina Division of Water Resources
NPDES Wastewater Unit RECEIVED
1617 Mail Service Center 0 1 2021
Raleigh, NC 27699-1617
Subject: Duke Energy Carolinas, LLC NCDEQIDWRINPDES
Marshall Steam Station
NPDES Permit Renewal Application
NPDES Permit #NC0004987
Catawba County
Dear Dr. Chernikov:
The subject NPDES permit expires on September 30, 2021. Enclosed is the application
for the renewal of this permit. As mandated by North Carolina Administrative Code 15A
NCAC 2 H.0105 (e), this permit application for renewal is being submitted at least 180
days prior to the expiration of the permit. Duke Energy Carolinas, LLC requests
notification that this application is complete.
Please find included in this application the following items:
1) EPA Form 1
2) Topographic Map
3) EPA Form 2C for Outfalls 001, 002 and 005
4) Flow Diagram
5) EPA Form 2E for Outfall 003
6) Narrative - Supplement Information for Station Description
7) 316 (a) Demonstration Report
8) Fish Tissue Report
9) In-stream Monitoring Results
10) 316 (b) Report (Flash Drive)
Duke Energy has reviewed the current NPDES permit. Based on station processes and
the review of historical data the following changes are requested for the current NPDES
permit.
1. Remove Section A. (2). The ash basin has completed the decanting phase and is
now in the dewatering phase.

Marshall Steam Station
NPDES Permit Renewal Application
March 29, 2021
Page 2 of 3
2. Section A. (3) - The ash basin is now in the dewatering phase with no wastewater
being discharge into the ash basin. Therefore, several footnotes can now be removed.
These include footnotes 1, 2, 3, 7 and several not numbered footnotes. The limits for
iron and copper should be removed and continue with a monitor and report requirement.
3. Section A. (6) - Since outfall 003 discharges into Lake Norman adjacent to the
station intake structure it is requested that the outfall status be changed from an internal
outfall to an outfall that discharges to the surface water.
4. Section A (8) - It is requested that the requirement to monitor for the following
parameters be removed based on historical monitoring data: Fluoride, silver, zinc,
arsenic, cadmium, chromium, lead, nickel, sulfates, chlorides, bromide, TDS and
conductivity.
5. Section A. (8) - It is requested that the toxicity test be updated based on actual flows
(IWC) and remove the condition for submitting a form 2C.
6. Section A. (10) - It is requested that internal outfall 010 be removed since coal pile
runoff limits are expressed at outfall 005.
7. Section A (18) - Update IWC for outfalls 002 and 005.
8. Section A. (19) - Remove this section since wastewater no longer discharges into the
ash basin since it is in the process of being closed.
9. Section A. (20) - This section can be removed since chemical cleanings no longer
discharge to the ash basin.
10. Section A. (29) - Requests that instream monitoring be revised from monthly to
quarterly based on review of data from permit term and lack of impact from operations.
As required by Part A (26) of the current NPDES permit Duke Energy requests that the
316 (a) thermal variance be continued. The included Balanced and Indigenous
Community Report (BIC) continues to demonstrate that Lake Norman supports a
balanced and indigenous community of aquatic wildlife.
As required by Part A (27) the 316 (b) compliance report is included with this application.
If you have any questions concerning this application, please contact me [phone]
or by email at [e-mail].
Sincerely,
Aid 44,
Robert Wylie
Lead Environmental Specialist

Marshall Steam Station
NPDES Permit Renewal Application
March 29, 2021
Page 3 of 3
Enclosures:
Form 1 Information
Topographic Map
Form 2C for Outfalls 001, 002 and 005
Flow Diagram
Form 2E for Outfall 003
Narrative - Supplement Information for Station Description
316 (a) Demonstration Report
Fish Tissue Report
In-stream Monitoring Report
316 (b) Report (Flash Drive)

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station OMB No.2040-0004
Form U.S.Environmental Protection Agency
1 \/EPA Application for NPDES Permit to Discharge Wastewater
NPDES GENERAL INFORMATION
SECTION 1.ACTIVITIES REQUIRING AN NPDES PERMIT(40 CFR 122.21(f)and(f)(1))
1.1 Applicants Not Required to Submit Form 1
1.1.1 Is the facility a new or existing publicly owned Is the facility a new or existing treatment works
treatment works? 1.1.2 treating domestic sewage?
If yes,STOP.Do NOT complete 0✓ No If yes, STOP.Do NOT No
Form 1.Complete Form 2A. complete Form 1.Complete
Form 2S.
1.2 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
a production facility? currently discharging process wastewater?
oYes 4 Complete Form 1 ✓❑ No ✓❑ Yes 4 Complete Form No
o- and Form 2B. 1 and Form 2C.
0• 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
L commenced to discharge? discharges only nonprocess wastewater?
d ❑ Yes 4 Complete Form 1 ✓l No ✓❑ Yes 4 Complete Form El No
cc and Form 2D. 1 and Form 2E.
= 1.2.5 Is the facility a new or existing facility whose
> discharge is composed entirely of stormwater
associated with industrial activity or whose
discharge is composed of both stormwater and
non-stormwater?
Yes 4 Complete Form 1 No
and Form 2F Marshall has an i dustrial storm water(ISW)permit NCS000548 from NC DEQ.
unless exempted by This permit is cur ently being renewed under the NCDEQ ISW renewal process.
40 CFR Therefore the Fo m 2F is deemed not needed for this application since an ISW
122.26(b)(14)(x)or permit applicatio using NC DEQ process was filed on October 24,2019.
b 15 .
SECTION 2. NAME,MAILING ADDRESS,AND LOCATION(40 CFR 122.21(f)(2))
2.1 Facility Name
Marshall Steam Station
O 2.2 EPA Identification Number
-40
O NC0004987
2.3 Facility Contact
Name(first and last) Title Phone number
QRobert Wylie Lead Environmental Specialist [phone]
Email address
[e-mail]
2.4 Facility Mailing Address
ZStreet or P.O.box
PO Box 1006 Mail Code EC13K
City or town State ZIP code
Charlotte North Carolina 28201
EPA Form 3510-1(revised 3-19) Page 1

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station OMB No.2040-0004
$ 2.5 Facility Location
a . Street,route number,or other specific identifier
Q 0 8320 East Highway 150
rn
c o County name County code(if known)
3 Catawba
City or town State ZIP code
z Terrell North Carolina 28682
SECTION 3.SIC AND NAICS CODES(40 CFR 122.21(f)(3))
3.1 SIC Code(s) Description(optional)
4911
y
N
v
C.)
U
3.2 NAICS Code(s) Description(optional)
0 1 2G4
`O 22111
U
a' NCDEQ/DWR/NPDES
SECTION 4.OPERATOR INFORMATION(40 CFR 122.21(f)(4))
4.1 Name of Operator
Duke Energy Carolinas,LLC
4.2 Is the name you listed in Item 4.1 also the owner?
£ ✓❑ Yes ❑ No
4.3 Operator Status
R ❑ Public—federal ❑ Public—state ❑Other public(specify)
0 0 Private ElOther(specify)
4.4 Phone Number of Operator
[phone]
4.5 Operator Address
Street or P.O. Box
PO Box 1006
o =
•= City or town State ZIP code
•o Charlotte North Carolina 28201
to
n Email address of operator
0 [e-mail]
SECTIO 15.INDIAN LAND(40 CFR 122.21(f)(5))
5.1 Is the facility located on Indian Land?
c -' ❑Yes El No
EPA Form 3510-1(revised 3-19) Page 2

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station OMB No.2040-0004
SECTION 6.EXISTING ENVIRONMENTAL PERMITS(40 CFR 122.21(f)(6))
6.1 Existing Environmental Permits(check all that apply and print or type the corresponding permit number for each)
d m NPDES(discharges to surface m RCRA(hazardous wastes) ❑ UIC(underground injection of
water) fluids)
o
NC0004987 NCD043678879
a ❑ PSD(air emissions) ❑ Nonattainment program(CM) 0 NESHAPs(CM)
w 0 Ocean dumping(MPRSA) ❑✓ Dredge or fill(CWA Section 404) ❑✓ Other(specify)
SAW-2015-01412 See Supplemental Information
SECTION 7.MAP(40 CFR 122.21(f)(7))
7.1 Have you attached a topographic map containing all required information to this application?(See instructions for
0.co
specific requirements.)
✓❑Yes 0 No ❑ CAFO—Not Applicable(See requirements in Form 2B.)
SECTION 8.NATURE OF BUSINESS(40 CFR 122.21(f)(8))
8.1 Describe the nature of your business.
Coal and Natural gas fueled electric generation.
w
to
c
.a
m
io
Z
SECTION 9.COOLING WATER INTAKE STRUCTURES(40 CFR 122.21(f)(9))
9.1 Does your facility use cooling water?
✓❑ Yes 0 No 4 SKIP to Item 10.1.
9.2 Identify the source of cooling water.(Note that facilities that use a cooling water intake structure as described at
,2 40 CFR 125,Subparts I and J may have additional application requirements at 40 CFR 122.21(r).Consult with your
cNPDES permitting authority to determine what specific information needs to be submitted and when.)
V Catawba River(Lake Norman)
SECTION 10.VARIANCE REQUESTS(40 CFR 122.21(f)(10))
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
coapply.Consult with your NPDES permitting authority to determine what information needs to be submitted and
when.)
d ❑ Fundamentally different factors(CWA ❑ Water quality related effluent limitations(CWA Section
e Section 301(n)) 302(b)(2))
R ❑ Non-conventional pollutants(CWA ✓❑ Thermal discharges(CWA Section 316(a))
40 Section 301(c)and(g))
❑ Not applicable
EPA Form 3510-1(revised 3-19) Page 3

r
EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station OMB No.2040-0004
SECTION 11.CHECKLIST AND CERTIFICATION STATEMENT(40 CFR 122.22(a)and(d))
11.1 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
that not all applicants are required to provide attachments.
Column 1 Column 2
❑✓ Section 1:Activities Requiring an NPDES Permit ❑ w/attachments
❑✓ Section 2:Name, Mailing Address,and Location ❑ wl attachments
✓❑ Section 3:SIC Codes ❑ w/attachments
✓❑ Section 4:Operator Information ❑ w/attachments
✓❑ Section 5: Indian Land ❑ w/attachments
.• ❑� Section 6: Existing Environmental Permits 0 wl attachments
❑✓ Section 7:Ma w/topographic
;g p ❑ map 1-1w/additional attachments
co
❑✓ Section 8: Nature of Business 0 wl attachments
co
❑✓ Section 9:Cooling Water Intake Structures ✓❑ w/attachments
-0
❑✓ Section 10:Variance Requests 0 w/attachments
❑✓ Section 11: Checklist and Certification Statement 0 w/attachments
r 11.2 Certification Statement
U
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
Rick Roper GM III-Regulated Stations
Sig a Date signed
03/29/2021
EPA Form 3510-1(revised 3-19) Page 4

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9 Outfall#: 001 Outfall#: 003
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ReceivingStream: Catawba River ReceivingStream: Catawba River
a
H Latitude: 35°35'43.4"N Latitude: 35°35'50.4"N
d Longitude: 80°57'48.2"W Longitude: 80°57'48.1"W
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2 Outfall#: 002 Outfalt#: 005
Receiving Stream: Catawba River Receiving Stream: Catawba River
g Latitude: 35°36'20.9"N Latitude: 35°36'1.7"N
ti Longitude: 80°57'34.4"W Longitude: 80°57'45.7"W Facility Location
0
m Outfall#: 002A and 002E Outfall#: 007
m Receiving Stream: Catawba River Receiving Stream: Catawba River N Duke Energy LLC
g Latitude for 002A: 35°35'57.2"N Latitude: 35°36'37.9"N 1:12,000 ner gl f
a• Longitude for 002A: 80°57'51.1"W Longitude: 80°57'33.7"W NC0004987
Latitude for 002B: 35°35'56.0"N 1 inch=1,000 feet Marshall Steam Station
• Longitude for 002B: 80°57'50.9"W
Source Copyright:©2013 National Geographic Society,i-cubed Coordinate System.NAD 1983 StatePlane North Carolina FIPS 3200 Feet

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station OMB No.2040-0004
Form U.S.Environmental Protection Agency
2C „EPA Application for NPDES Permit to Discharge Wastewater
NPDES EXISTING MANUFACTURING,COMMERCIAL,MINING,AND SILVICULTURE OPERATIONS
SECTION 1.OUTFALL LOCATION(40 CFR 122.21(g)(1))
1.1 Provide information on each of the facility's outfalls in the table below.
g Numbelr Receiving Water Name Latitude Longitude
.�
u
001 Lake Norman 35° 35' 43.4" N 80° 57' 48.2" W
co
0 002 Lake Norman 35° 36' 20.9" N 80° 57' 34.4" W
005 Lake Norman 35° 36' 1.7" N 80° 57' 45.7" W
SECTION 2.LINE DRAWING(40 CFR 122.21(g)(2))
2.1 Have you attached a line drawing to this application that shows the water flow through your facility with a water
J (Ts
balance?(See instructions for drawing requirements. See Exhibit 2C-1 at end of instructions for example.)
c` ✓❑ Yes ❑ No
SECTION 3.AVERAGE FLOWS AND TREATMENT(40 CFR 122.21(g)(3))
3.1 For each outfall identified under Item 1.1,provide average flow and treatment information.Add additional sheets if
necessary.
"Outfall Number** 001
Operations Contributing to Flow
Operation Average Flow
Once through non-contact cooling water. 850 mgd
I
c
3 mgd
i° Treatment Units
a, Description Code from Final Disposal of Solid or
CO
(include size,flow rate through each treatment unit, Liquid Wastes Other Than
a' retention time,etc.) Table 2C-1
b Discharge
Once through non-contact cooling water. 4A N/A
EPA Form 3510-2C(Revised 3-19)
Page 1

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station OMB No.2040-0004
Form U.S.Environmental Protection Agency
2C \'"/EPA Application for NPDES Permit to Discharge Wastewater
NPDES EXISTING MANUFACTURING, COMMERCIAL, MINING,AND SILVICULTURE OPERATIONS
SECTION 1.OUTFALL LOCATION(40 CFR 122.21(g)(1))
1.1 Provide information on each of the facility's outfalls in the table below.
0 Numbelr Receiving Water Name Latitude Longitude
co
U
002A 80° 57' 51.1" W
co
0 002B
80° 57' 50.9" W
007 80° 57' 33.7" W
SECTION 2.LINE DRAWING(40 CFR 122.21(g)(2))
p, 2.1 Have you attached a line drawing to this application that shows the water flow through your facility with a water
J .c balance?(See instructions for drawing requirements.See Exhibit 2C-1 at end of instructions for example.)
❑✓ Yes ❑ No
SECTION 3.AVERAGE FLOWS AND TREATMENT(40 CFR 122.21(g)(3))
3.1 For each outfall identified under Item 1.1, provide average flow and treatment information.Add additional sheets if
necessary.
*''Outfall Number** 002A
Operations Contributing to Flow
Operation Average Flow
Yard sump emergency overflow 2.4 mgd
mgd
i
mgd
03
3 mgd
Treatment Units
Description Code from Final Disposal of Solid or
co
(include size,flow rate through each treatment unit, Liquid Wastes Other Than
retention time,etc.) Table 2C 1 by Discharge
Yard sump emergency overflow 4A N/A
EPA Form 3510-2C(Revised 3-19) Page 1

•
EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station OMB No.2040-0004
3.1 **Outfall Number** 002
cont. Operations Contributing to Flow
Operation Average Flow
De-watering of ash basin and ground water remediation. 2.2 mgd
mgd
mgd
mgd
Treatment Units
Description Code from Final Disposal of Solid or
(include size,flow rate through each treatment unit, Table 2C•1 Liquid Wastes Other Than
retention time,etc.) by Discharge
Clarifier and sand filter 1R,20,2K,4A and 5Q Landfill
0
as
iv
L
c **Outfall Number** 005
Operations Contributing to Flow
0 Operation Average Flow
Process low volume wastewater and storm water. 5.1 mgd
a)
mgd
mgd
mgd
Treatment Units
Description Code from Final Disposal of Solid or
(include size,flow rate through each treatment unit, Table 2C-1 Liquid Wastes Other Than
retention time,etc.) by Discharge
Lined retention basin 1U,2K and 4A Landfill
3.2 Are you applying for an NPDES permit to operate a privately owned treatment works?
N N
d ❑ Yes ElNo 4 SKIP to Section 4.
on co
3.3 Have you attached a list that identifies each user of the treatment works?
❑ Yes ❑ No
EPA Form 3510-2C(Revised 3-19) Page 2

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station OMB No.2040-0004
3.1 **Outfall Number** 002B
cont. Operations Contributing to Flow
Operation Average Flow
Yard sump emergency overflow 2.4 mgd
mgd
mgd
mgd
Treatment Units
Description Code from Final Disposal of Solid or
(include size,flow rate through each treatment unit, Table 2C-1 Liquid Wastes Other Than
retention time,etc.) by Discharge
Yard sump emergency overflow 4A NA
761
0
U
E
H
**Outfall Number** 007
Operations Contributing to Flow
Operation Average Flow
Ash basin emergency overflow. 0 mgd
>
mgd
mgd
mgd
Treatment Units
Description Code from Final Disposal of Solid or
(include size,flow rate through each treatment unit, Table 2C•1 Liquid Wastes Other Than
retention time,etc.) by Discharge
Ash basin emergency overflow. Should never discharge. 4A NA
3.2 Are you applying for an NPDES permit to operate a privately owned treatment works?
❑ Yes ❑✓ No 4 SKIP to Section 4.
rn
3.3 Have you attached a list that identifies each user of the treatment works?
❑ Yes ❑ No
EPA Form 3510-2C(Revised 3-19) Page 2

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station OMB No.2040-0004
SECTION 4.INTERMITTENT FLOWS(40 CFR 122.21(g)(4))
4.1 Except for storm runoff,leaks,or spills,are any discharges described in Sections 1 and 3 intermittent or seasonal?
❑ Yes ❑ No 4 SKIP to Section 5.
4.2 Provide information on intermittent or seasonal flows for each applicable outfall.Attach additional pages, if necessary.
Outfall Operation Frequency Flow Rate
Number (list) Average Average Maximum Duration
Da s/Week Months/Year Averaie Daily
Yar• Sump '° •• 2.4 mgd 0.1 days
002A • '• mgd days
u_
' •• mgd days
Yard Sump '• •• 2.4 mgd 0.1 days
Emergency 002B
• •• mgd days
' •• mgd days
Due to site changes 0 days/week 0 months/year 0 •• 0 mgd 0 days
this 007
• •• mgd days
' •• mgd days
SECTION 5.PRODUCTION(40 CFR 122.21(g)(5))
5.1 Do any effluent limitation guidelines(ELGs)promulgated by EPA under Section 304 of the CWA apply to your facility?
✓❑ Yes ❑ No 4 SKIP to Section 6.
5.2 Provide the following information on applicable ELGs.
ELG Category ELG Subcategory Regulatory Citation
Steam Electric Steam Electric Power Industry 40 CFR 423
U
Q
0-
5.3 Are any of the applicable ELGs expressed in terms of production(or other measure of operation)?
❑ Yes ✓❑ No 4 SKIP to Section 6.
0
5.4 Provide an actual measure of daily production expressed in terms and units of applicable ELGs.
Outfall
Jo Number Operation,Product,or Material Quantity per Day Unit of
Measure
CO
0
0
a
EPA Form 3510-2C(Revised 3-19) Page 3

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station OMB No.2040-0004
SECTION 6.IMPROVEMENTS(40 CFR 122.21(g)(6))
6.1 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 + SKIP to Item 6.3.
6.2 Briefly identify each applicable project in the table below.
Affected Final Compliance Dates
Brief Identification and Description of Outfalls Source(s)of
o Project (list outfall Discharge Required Projected
EL number)
E
co
co
CO
CO
rn
n
6.3 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 ❑ No ✓❑ Not applicable
SECTION 7.EFFLUENT AND INTAKE CHARACTERISTICS(40 CFR 122.21(g)(7))
See the instructions to determine the pollutants and parameters you are required to monitor and, in turn,the tables you must
complete.Not all applicants need to complete each table.
Table A.Conventional and Non-Conventional Pollutants
7.1 Are you requesting a waiver from your NPDES permitting authority for one or more of the Table A pollutants for any of
your outfalls?
❑ Yes ❑✓ No 4 SKIP to Item 7.3.
7.2 If yes,indicate the applicable outfalls below.Attach waiver request and other required information to the application.
Outfall Number Duffel!Number Outfall Number
0 7.3 Have you completed monitoring for all Table A pollutants at each of your outfalls for which a waiver has not been
to requested and attached the results to this application package?
El Yes ❑ No;a waiver has been requested from my NPDES
permitting authority for all pollutants at all outfalls.
Table B.Toxic Metals,Cyanide,Total Phenols,and Organic Toxic Pollutants
7.4 Do any of the facility's processes that contribute wastewater fall into one or more of the primary industry categories
listed in Exhibit 2C-3?(See end of instructions for exhibit.)
R ✓❑ Yes ❑ No 4 SKIP to Item 7.8.
7.5 Have you checked"Testing Required"for all toxic metals,cyanide, and total phenols in Section 1 of Table B?
❑✓ Yes
❑ No
7.6 List the applicableprimaryindustry pp categories and check the boxes indicating
9the required GC/MS fraction(s)
q ctlon(s)identified
in Exhibit 2C-3.
Primary Industry Category Required GC/MS Fraction(s)
(Check applicable boxes.)
Steam Electric 0 Volatile 0 Acid ❑Base/Neutral ❑Pesticide
❑Volatile 0 Acid 0 Base/Neutral 0 Pesticide
0 Volatile 0 Acid 0 Base/Neutral 0 Pesticide
EPA Form 3510-2C(Revised 3-19) Page 4

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station OMB No.2040-0004
7.7 Have you checked"Testing Required"for all required pollutants in Sections 2 through 5 of Table B for each of the
GC/MS fractions checked in Item 7.6?
✓❑ Yes ❑ No
7.8 Have you checked`Believed Present"or"Believed Absent"for all pollutants listed in Sections 1 through 5 of Table B
where testing is not required? g
✓❑ Yes ❑ No
7.9 Have you provided(1)quantitative data for those Section 1,Table B,pollutants for which you have indicated testing is
required or(2)quantitative data or other required information for those Section 1,Table B,pollutants that you have
indicated are"Believed Present"in your discharge?
✓❑ Yes ❑ No
7.10 Does the applicant qualify for a small business exemption under the criteria specified in the instructions?
❑ Yes 4 Note that you qualify at the top of Table B, ❑ No
0 then SKIP to Item 7.12.
7.11 Have you provided(1)quantitative data for those Sections 2 through 5,Table B,pollutants for which you have
Udetermined testing is required or(2)quantitative data or an explanation for those Sections 2 through 5,Table B,
pollutants you have indicated are"Believed Present"in your discharge?
✓❑ Yes ❑ No
cv Table C.Certain Conventional and Non-Conventional Pollutants
7.12 Have you indicated whether pollutants are"Believed Present"or"Believed Absent"for all pollutants listed on Table C
for all outfalls?
✓❑ Yes ❑ No
R
c 7.13 Have you completed Table C by providing(1)quantitative data for those pollutants that are limited either directly or
0 indirectly in an ELG and/or(2)quantitative data or an explanation for those pollutants for which you have indicated
;° "Believed Present"?
❑✓ Yes ❑ No
w Table D.Certain Hazardous Substances and Asbestos
7.14 Have you indicated whether pollutants are"Believed Present"or`Believed Absent"for all pollutants listed in Table D for
all outfalls?
✓❑ Yes ❑ No
7.15 Have you completed Table D by(1)describing the reasons the applicable pollutants are expected to be discharged
and(2)by providing quantitative data,if available?
❑✓ Yes ❑ No
Table E.2,3,7,8-Tetrachlorodibenzo-p-Dioxin(2,3,7,8-TCDD)
7.16 Does the facility use or manufacture one or more of the 2,3,7,8-TCDD congeners listed in the instructions,or do you
know or have reason to believe that TCDD is or may be present in the effluent?
❑ Yes 4 Complete Table E. ❑� No 4 SKIP to Section 8.
7.17 Have you completed Table E by reporting qualitative data for TCDD?
❑ Yes ❑ No
SECTION 8.USED OR MANUFACTURED TOXICS(40 CFR 122.21(g)(9))
8.1 Is any pollutant listed in Table B a substance or a component of a substance used or manufactured at your facility as
0 an intermediate or final product or byproduct?
❑ Yes ✓❑ No 4 SKIP to Section 9.
8.2 List the pollutants below.
o 1. 4. 7.
0
2. 5. 8.
3. 6. 9.
EPA Form 3510-2C(Revised 3-19) Page 5

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station OMB No.2040-0004
SECTION 9.BIOLOGICAL TOXICITY TESTS(40 CFR 122.21(g)(11))
9.1 Do you have any knowledge or reason to believe that any biological test for acute or chronic toxicity has been made
within the last three years on(1)any of your discharges or(2)on a receiving water in relation to your discharge?
❑✓ Yes ❑ No 4 SKIP to Section 10.
N
9.2 Identify the tests and their.urposes below.
Test(s) Purpose of Test(s) Submitted to NPDES
o p Permitting_Authority? Date Submitted
WET NPDES Permit ✓❑ Yes ❑ No
rn Requirement
'm ❑ Yes ❑ No
❑ Yes ❑ No
SECTION 10.CONTRACT ANALYSES(40 CFR 122.21(g)(12))
10.1 Were any of the analyses reported in Section 7 performed by a contract laboratory or consulting firm?
✓❑ Yes ❑ No 4 SKIP to Section 11.
10.2 Provide information for each contract laboratory or consulting firm below.
Laborato Number 1 Laborato Number 2 Laboratory Number 3
Name of laboratory/firm
Duke Energy Carolinas,LLC PACE Analytical Services,LLC
V)
d
(1), Laboratory address
Huntersville,NC 28078 West Columbia,SC 29172
13339 Hagers Ferry Road 106 Vantage Point Drive,
w
0 Phone number --
:0 :0 00
Pollutant(s)analyzed
Metals,TKN,Nitrate-Nitrite, BOD,Color,Sulfide,Sulfite,
TP,Oil and Grease,TOC, Volatile,Semi-Volitile,Acid
Bromide,Sulfate,Fluoride Compounds,Mercury,TSS,
COD,Fecal Coliform,Field
Parameters,PCBs
SECTION 11.ADDITIONAL INFORMATION(40 CFR 122.21(g)(13))
11.1 Has the NPDES permitting authority requested additional information?
o ❑ Yes ElNo 4 SKIP to Section 12.
E11.2 List the information requested and attach it to this application.
`o
= 1• 4.
0 2. 5.
-o
3. 6.
EPA Form 3510-2C(Revised 3-19) Page 6

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station OMB No.2040-0004
SECTION 12.CHECKLIST AND CERTIFICATION STATEMENT(40 CFR 122.22(a)and(d))
12.1 In Column 1 below,mark the sections of Form 2C 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.
Column 1 Column 2
O Section 1:Outfall Location ✓❑ w/attachments
❑✓ Section 2:Line Drawing w/line drawing ❑ w/additional attachments
171 Section 3:Average Flows and w/list of each user of
Treatment ❑ w/attachments 0 privately owned treatment
works
❑✓ Section 4:Intermittent Flows ❑ w/attachments
❑ Section 5: Production 0 w/attachments
w/optional additional
❑ Section 6: Improvements ❑ w/attachments ❑ sheets describing any
additional pollution control
plans
1-1
w/request for a waiver and ❑ w/explanation for identical
supporting information outfalls
w/small business exemption
❑ request ❑ w/other attachments
0 Section 7: Effluent and Intake ❑✓ w/Table A
Characteristics ❑ w/Table B
0
✓❑ w/Table C El w/Table D
❑� w/Table E ❑ w/analytical results as an
attachment
❑ Section 8: Used or Manufactured
11) Toxics ❑ w/attachments
❑ Section 9: Biological Toxicity 0 w/attachments
Tests
0 Section 10:Contract Analyses ❑ w/attachments
❑ Section 11:Additional Information ❑ w/attachments
❑ Section 12:Checklist and
Certification Statement ❑ w/attachments
12.2 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
Rick Roper GM III Regulated Stations
Signature Date signed
03/29/2021
EPA Form 3510-2C(Revised 3-19) Page 7

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE A.CONVENTIONAL AND NON CONVENTIONAL POLLUTANTS(40 CFR 122.21(g)(7)(iii))l
Effluent Intake
Waiver (Optional)
Units Maximum Maximum Long-Term
Pollutant Requested
(if applicable) (specify) Daily Monthly Average Daily Number of Long-Term Number of
Discharge Discharge Discharge Analyses Average Value Analyses
(required) (if available) (if available)
❑ Check here if you have applied to your NPDES permitting authority for a waiver for all of the pollutants listed on this table for the noted outfall.
Biochemical oxygen demand Concentration mg/L <2.0 1 <2.0 1
1' ❑
(BOD5)
Mass lb/Day <24400.0 1
Chemical oxygen demand Concentration mg/L <20 1 <20.0 1
2' ❑
(COD)
Mass lb/Day <244000 1
Concentration mg/L 1.6 1 1.4 1
3. Total organic carbon(TOC) 0
Mass lb/Day 19500.0 1
Concentration mg/L 5.2 1 5.7 1
4. Total suspended solids(TSS) 0
Mass lb/Day 63500.0 1
Concentration mg-N/L <0.02 1 0.026 1
5. Ammonia(as N) ❑
Mass lb/Day <244.0 1
6. Flow 0 Rate MGD 1,463.0 1
Temperature(winter) 0 °C °C 15.2 1 8.4 1
7.
Temperature(summer) 0 °C °C
pH(minimum) 0 Standard units s.u. 6.7 1 6.9 1
8.
pH(maximum) 0 Standard units s.u. 6.7 1 6.9 1
1 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 3510-2C(Revised 3-19) Page 9

This page intentionally left blank.

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Average Number Long- Number
Present Absent Daily Monthly Term
Discharge Discharge Daily of Average of
(required) (if available) Discharge Analyses Value Analyses
(if available)
Check here if you qualify as a small business per the instructions to Form 2C and,therefore,do not need to submitquantitative❑ data for anyof the organic toxic pollutants in Sections
9
2 through 5 of this table. Note,however,that you must still indicate in the appropriate column of this table if you believe any of the pollutants listed are present in your discharge.
Section 1.Toxic Metals,Cyanide,and Total Phenols 1
1.1 Antimony,total ID ❑ ✓❑ Concentration ug/L <1 1 <1 1
(7440-36-0) Mass lb/Day <12.2 1
Arsenic,total ❑ 0 ❑ Concentration ug/L <1 1 <1 1
1.2 (7440-38-2) Mass lb/Day <12.2 1
1.3 Beryllium,total ❑ ❑ ❑ Concentration ug/L <1 1 <1 1
(7440-41-7) Mass lb/Day <12.2 1
Cadmium,total Concentration ug/L <0.1 1 <0.1 1 1.4 El 0
❑
(7440-43 9) Mass lb/Day <12.2 1
1.5 Chromium,total ❑ 0
❑ Concentration ug/L <1 1 <1 1
(7440-47-3) Mass lb/Day <12.2 1
1.6 Copper,total ❑ 00 Concentration ug/L 8.26 1 1.04 1
(7440-50-8) Mass lb/Day 101 1
1.7 Lead,total Concentration ug/L <1 1 <1 1
(7439-92-1) ❑ ❑
Mass lb/Day <12.2 1
Mercury,total Concentration ng/L 1.10 1 1.03 1
1.8 El ❑ 0
(7439-97-6) Mass lb/Day 0.0134 1
1.9 Nickel,total ❑ 0
❑ Concentration ug/L <1 1 <1 1
(7440-02-0) Mass lb/Day <12.2 1
1.10 Selenium,total El ❑ ❑ Concentration ug/L <1 1 <1 1
(7782-49-2) Mass Ib/Day <12.2 1
1.11 Silver,total ❑ 0
d Concentration ug/L <1 1 <1 1
(7440-22-4) Mass lb/Day <12.2 1
EPA Form 3510-2C(Revised 3-19) Page 11

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence Intake
(check one) Effluent (optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Average Number Long- Number
Present Absent Daily Monthly Term
aily of of
Discharge
D(faCalablge) DisDcharge Analyses AValuee Analyses
ui ) (if available)
Thallium,total Concentration ug/L <0.2 1 <0.2 1
1.12 (7440-28-0) Mass lb/Day <2.44 1
1.13 Zinc,total ElConcentration mg/L <0.005 1 <0.005 1
(7440-66-6) Mass lb/Day <61.0 1
1.14 Cyanide,total Concentration mg/L <0.01 1 <0.01 1
(57-12-5) Mass lb/Day <122.0 1
1.15 Phenols,total Concentration ug/L <1.6 1 <1.6 1
Mass lb/Day <19.5 1
Section 2.Organic Toxic Pollutants(GC/MS Fraction-Volatile Compounds)
Acrolein Concentration ug/L <5.0 1 <1.0 1
2.1 (107-02-8) Mass lb/Day <61 1
2.2 Acrylonitrile Concentration ug/L <5.0 1 <1.0 1
El El 0
(107-13-1) Mass lb/Day <61 1
Benzene ❑ ❑ ❑ Concentration ug/L <1.0 1 <1.0 1
2.3 (71-43-2) Mass lb/Day <12.2 1
2 4 Bromoform ❑✓ Concentration ug/L <1.0 1 <1.0 1
(75-25-2) Mass lb/Day <12.2 1
2 5 Carbon tetrachloride Concentration ug/L <1.0 1 <1.0 1
0 El El
(56-23-5) Mass lb/Day <12.2 1
2.6 Chlorobenzene Concentration ug/L <1.0 1 <1.0 1
(108-90-7) Mass lb/Day <12.2 1
2.7 Chlorodibromomethane Concentration ug/L <1.0 1 <1.0 1
(124-48-1) Mass lb/Day <12.2 1
2.8 Chloroethane Concentration ug/L <2.0 1 <2.0 1
(75-00-3) Mass lb/Day <24.2 I 1
EPA Form 3510-2C(Revised 3-19) Page 12

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Long-
(and DailyMonthlyAverage Number Term Number
Present Absent
of of
Discharge Discharge DisDcharge Analyses Average Analyses
re wired
(if
q available) (if available) Value
2.9 2-chloroethylvinyl ether ❑✓ Concentration ug/L <5.0 1 <5.0 1
(110-75-8) Mass lb/Day <61.0 1
2.10 Chloroform(67-66-3) 0Concentration ug/L <1.0 1 <1.0 1
Mass lb/Day <12.2 1
2.11 Dichlorobromomethane Concentration ug/L <1.0 1 <1.0 1
0 El(75-27-4) Mass lb/Day <12.2 1
2.12 1,1-dichloroethane Concentration ug/L <1.0 1 <1.0 1
(75-34-3) Mass lb/Day <12.2 1
2.13 1,2-dichloroethane Concentration ug/L <1.0 1 <1.0 1
(107-06-2) Mass lb/Day <12.2 1
2.14 11-dichloroethylene Concentration ug/L <1.0 1 <1.0 1
El
(75-35-4) Mass lb/Day <12.2 1
2.15 1,2-dichloropropane Concentration ug/L <1.0 1 <1.0 1
El 0(78-87-5) Mass lb/Day <12.2 1
2.16 1,3-dichloropropylene Concentration ug/L <1.0 1 <1.0 1
(542-75-6) Mass lb/Day <12.2 1
217 Ethylbenzene O Concentration ug/L <1.0 1 <1.0 1
(100-41-4) Mass lb/Day <12.2 1
218 Methyl bromide Concentration ug/L <2.0 1 <24.4 1
El
(74-83-9) Mass lb/Day <24.4 1
2.19 Methyl chloride Concentration ug/L <2.0 1 <24.4 1
El 0(74-87-3) Mass lb/Day <24.4 1
2.20 Methylene chloride O Concentration ug/L <1.0 1 <1.0 1
El
(75-09-2) Mass lb/Day <12.2 1
2.21 1 1,2,2-tetrachloroethane m Concentration ug/L <1.0 1 <1.0 1
0
(79-34-5) Mass lb/Day <12.2 1
EPA Form 3510-2C(Revised 3-19) Page 13

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long•Term
(and CAS Number,if available) Required Believed Believed Maximum Maximum Long-
(and Average Number g Number
Present Absent ) Daily Monthly g Term
Discharge Discharge Discharge a Analyaily ses Average of
(required) (if available) g y Value Analyses
(if available)
2.22 Tetrachloroethylene 0✓ Concentration ug/L <1.0 1 <1.0 1
1:1(127 18 4) Mass lb/Day <12.2 1
2.23 Tolue(108-88-3) ✓l El ✓0 ne Concentration ug/L <1.0 1 <1.0 1
Mass lb/Day <12.2 1
2.24 1,2-trans-dichloroethylene Concentration ug/L <1.0 1 <1.0 1
(156 60 5) Mass lb/Day <12.2 1
2.25 1,1,1-trichloroethane Concentration ug/L <1.0 1 <1.0 1
(71 55 6) Mass lb/Day <12.2
1
2 26 1,1,2-trichloroethane Concentration ug/L <1.0 1 <1.0 1
1 (79-00-5) Mass lb/Day <12.2 1
2.27 Trichloroethylene ❑ Concentration ug/L <1.0 1 <1.0 1
(79 01 6) Mass lb/Day <12.2 1
2.28 Vinyl chloride Concentration ug/L <1.0 1 <1.0 1
(75 01 4) Mass lb/Day <12.2 1
Section 3.Organic Toxic Pollutants(GC/MS Fraction-Acid Compounds)
3.1 2-chlorophenol Concentration ug/L <1.6 1 <1.6 1 -
El(95 57 8) Mass lb/Day <19.5
1
3.2 2,4-dichlorophenol Concentration ug/L <1.6
1 <1.6 1
(120-83-2) 0 0
Mass lb/Day <19.5 1
3.3 2,4-dimethylphenol Concentration ug/L <1.6
0 1 <1.6 1
(105-67-9) 0
Mass lb/Day <19.5 1
3.4 4,6-dinitro-o-cresol Concentration ug/L <8.0 1 <8.0 1
El(534 52 1) Mass lb/Day <97.7 1
3.5 2,4-dinitrophenol 0 Concentration ug/L <8.0 1 <8.0 1
1:1(51 28 5) Mass lb/Day <97.7 1
EPA Form 3510-2C(Revised 3-19)
. Page 14

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Long-
(and ) DailyMonthlyAverage Number Number
Present Absent Dailyof Term of
Discharge Discharge Average
(required) (if available) Discharge Analyses Value Analyses
(if available)
3.6 2-nitrophenol O Concentration ug/L <3.2 1 <3.2 1
El 0
(88-75-5) Mass lb/Day <39.1 1
4-nitrophenol Concentration ug/L <8.0 1 <8.0 1
3.7 El 0(100-02-7) Mass lb/Day <97.7 1
3.8 p chloro m cresol El 0 El Concentration ug/L <1.6 1 <1.6 1
(59-50-7) Mass lb/Day <19.5 1
3.9 Pentachlorophenol Concentration ug/L <8.0 1 <8.0 1
(87-86-5) Mass Ib/Day <97.7 <97.7 1
Phenol Concentration ug/L <0.0050 1 <0.005 1
3.10 (108-95-2) Mass lb/Day <61 1
3.11 2,4,6-trichlorophenol Concentration ug/L <1.6 1 <1.6 1
(88-05-2) Mass lb/Day <19.5 1
Section 4.Organic Toxic Pollutants(GC/MS Fraction-Base/Neutral Compounds)
4.1 Acenaphthene Concentration ug/L <1.6 1 <1.6 1
(83-32-9) Mass lb/Day <19.5 1
4.2 Acenaphthylene Concentration ug/L <1.6 1 <1.6 1
(208-96-8) Mass lb/Day <19.5 1
4.3 Anthracene Concentration ug/L <1.6 1 <1.6 1
El 0 El
(120-12-7) Mass lb/Day <19.5 1
4.4 Benzidine Concentration ug/L <8.0 1 <8.0 1
(92-87-5) Mass lb/Day <97.7 1
4.5 Benzo(a)anthracene ElConcentration ug/L <1.6 1 <1.6 1
1:1(56-55-3) Mass lb/Day <19.5 1
4.6 Benzo(a)pyrene 0Concentration ug/L <1.6 1 <1.6 1
(50-32-8) Mass lb/Day <19.5 1
EPA Form 3510-2C(Revised 3-19) Page 15

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing •
Units Long-Term
(and CAS Number,if available) Required Believed Believed (speci Maximum Maximum Long-
) MonthlyAverage Number Number
Present Absent Daily Term
Discharge Discharge Daily of Average of
(required) (if available) Discharge Analyses Analyses
Value
(if available)
4.7 3,4-benzofluoranthene Concentration ug/L <1.6 1 <1.6 1
(205-99-2) Mass lb/Day <19.5 1
4.8 Benzo(ghi)perylene Concentration ug/L <1.6 1 <1.6 1
(191-24-2) Mass lb/Day <19.5 1
4.9 Benzo(k)fluoranthene Concentration ug/L <1.6 1 <1.6 1
El
(207-08-9) Mass lb/Day <19.5 1
4.10 Bis(2-chloroethoxy)methane Concentration ug/L <1.6 1 <1.6 1
(111-91-1) Mass lb/Day <19.5 1
4.11 Bis(2-chloroethyl)ether Concentration ug/L <1.6 1 <1.6 1
0 El(111-44-4) Mass lb/Day <19.5 1
4.12 Bis(2-chloroisopropyl)ether Concentration
(102-80-1)
Mas
s
4.13 Bis(2-ethylhexyl)phthalate ❑ Concentration ug/L <8.0 1 1
(117-81-7) Mass lb/Day <97.7 1
4.14 4-bromophenyl phenyl ether Concentration ug/L <1.6 1 <1.6 1
(101-55-3) Mass lb/Day <19.5 1
4.15 Butyl benzyl phthalate Concentration ug/L <1.6 1 <1.6 1
(85-68-7) Mass lb/Day <19.5 1
4.16 2-chloronaphthalene 0 Concentration ug/L <1.6 1 <1.6 1
(91-58-7) Mass lb/Day <19.5 1
4.17 4-chlorophenyl phenyl ether Concentration ug/L <1.6 1 <1.6 1
I (7005-72-3) 00 Mass lb/Day <19.5 1
4.18 Chrysene Concentration ug/L <1.6 1 <1.6 1
El El 0
(218-01-9) Mass lb/Day <19.5 1
4.19 Dibenzo(a,h)anthracene Concentration ug/L <1.6 1 <1.6 1
(53-70-3) Mass lb/Day <19.5 1
EPA Form 3510-2C(Revised 3-19) Page 16

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed Maximum Maximum Lon
(specify) DailyMonthlyAverage Number g- Number
Present Absent Dailyof Term of
Discharge Discharge Discharge Analyses Average
(required) (if available) g y Value Analyses
(if available)
4.20 1,2-dichlorobenzene Concentration ug/L <1.0 1 <1.0 1
El 0(95-50-1) Mass lb/Day <12.2 1
4.21 1,3-dichlorobenzene Concentration ug/L <1.0 1 <1.0 1
0 0(541-73-1) Mass lb/Day <12.2 1
4.22 1 4-dichlorobenzene Concentration ug/L <1.0 1 <1.0 1
0 El(106-46-7) Mass lb/Day <12.2 1
4.23 3 3-dichlorobenzidine Concentration ug/L <8.0 1 <8.0 1
0 0(91-94-1) Mass lb/Day <97.7 1
4.24 Diethyl phthalate Concentration ug/L <1.6 1 <1.6 1
El El(84-66-2) Mass lb/Day <19.5 1
4.25 Dimethyl phthalate Concentration ug/L <1.6 1 <1.6 1
(131-11-3) Mass lb/Day <19.5 1
4.26 Di-n-butyl phthalate Concentration ug/L <1.6 1 <1.6 1
0 0(84-74-2) Mass lb/Day <19.5 1
4.27 2,4-dinitrotoluene a Concentration ug/L <1.6 1 <1.6 1
0
(121-14-2) Mass lb/Day <19.5 1
4.28 2,6-dinitrotoluene Concentration ug/L <1.6 1 <1.6 1
(606-20-2) Mass lb/Day <19.5 1
4.29 Di-n-octyl phthalate Concentration ug/L <1.6 1 <1.6 1
(117-84-0) Mass lb/Day <19.5 1
4.30 1,2-Diphenylhydrazine 0 Concentration
(as azobenzene)(122-66-7) Mass
4.31 Fluoranthene Concentration ug/L <1.6 1 <1.6 1
(206-44-0) Mass lb/Day <19.5 1
4.32 Fluorene Concentration ug/L <1.6 1 <1.6 1
(86-73-7) Mass lb/Day <19.5 1
EPA Form 3510-2C(Revised 3-19)
Page 17

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed Maximum Maximum Lon
Q (specify) DailyMonthlyAverage Number g- Number
Present Absent Dailyof Term of
Discharge Discharge Average
(required) (if available) Discharge Analyses Value Analyses
(if available)
4.33 Hexachlorobenzene Concentration ug/L <1.6 1 <1.6 1
El 0(118-74-1) Mass lb/Day <19.5 1
4.34 Hexachlorobutadiene Concentration ug/L <1.6 1 <1.6 1
(87-68-3) Mass lb/Day <19.5 1
4.35 Hexachlorocyclopentadiene El ug/L <8.0 1 1
(77-47-4) Mass lb/Day <97.7 1
4.36 Hexachloroethane Concentration ug/L <1.6 1 <1.6 1
(67-72-1) Mass lb/Day <19.5 1
4.37 Indeno(1,2,3-cd)pyrene Concentration ug/L <1.6 1 <1.6 1
(193-39-5) Mass lb/Day <19.5 1
4.38 Isophorone Concentration ug/L <1.6 1 <1.6 1
0 El(78-59-1) Mass lb/Day <19.5 1
4.39 Naphthalene Concentration ug/L <1.6 1 <1.6 1
El 0(91-20-3) Mass lb/Day <19.5 1
4.40 Nitrobenzene Concentration ug/L <1.6 1 <1.6 1
(98-95-3) Mass lb/Day <19.5 1
4.41 N-nitrosodimethylamine Concentration ug/L <1.6 1 <1.6 1
0 0(62-75-9) Mass lb/Day <19.5 1
4.42 N-nitrosodi-n-propylamine El ug/L <1.6 1 <1.6 1
(621-64-7) Mass lb/Day <19.5 1
4.43 N-nitrosodiphenylamine Concentration ug/L <1.6 1 <1.6 1
El 0(86-30-6) Mass lb/Day <19.5 1
4.44 Phenanthrene Concentration ug/L <1.6 1 <1.6 1
(85-01-8) Mass lb/Day <19.5 1
4.45 Pyrene Concentration ug/L <1.6 1 <1.6 1
El 0(129-00-0) Mass lb/Day <19.5 1
EPA Form 3510-2C(Revised 3-19) Page 18

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Long-
MonthlyAverage Number Number
Present Absent Daily Dailyof Term of
Discharge Discharge Average Analyses
(required) (if available) Discharge Analyses Value
(if available)
4.46 12,4-trichlorobenzene Concentration ug/L <1.6 1 <1.6 1
El(120-82-1) Mass lb/Day <19.5 1
Section 5.Organic Toxic Pollutants(GC/MS Fraction—Pesticides)
5.1 Aldrin Concentration
(309-00-2) Mass
5.2 a-BHC Concentration
El(319-84-6) Mass
5.3 R BHC ❑ ❑ 0✓ Concentration
(319-85-7) Mass
5.4 y-BHCEl Concentration
(58-89-9) Mass
5.5 i-BHC Concentration
(319-86-8) Mass
5.6 Chlordane Concentration
(57-74-9) � 0 ✓l
Mass
5.7 4,4'-DDT Concentration
El(50-29-3) Mass
5.8 4 4'-DDE Concentration
(72-55-9) Mass
5.9 4,4'-DDD Concentration
El(72-54-8) Mass
5.10 Dieldrin a Concentration
00
(60-57-1) Mass
5.11 a-endosulfan Concentration
(115-29-7) � � ✓0
Mass
EPA Form 3510-2C(Revised 3-19)
Page 19

•
EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Long-
(and �) DailyMonthlyAverage Number Number
Present Absent Dailyof Term of
Discharge Discharge Average
(required) (if available) Discharge Analyses Value Analyses
(if available)
5.12 13-endosulfan 0
0
❑ Concentration
(115-29-7) Mass
5.13 Endosulfan sulfate 0
0
❑ Concentration
(1031-07-8) Mass
5.14 Endrin El 0
0 Concentration
(72-20-8) Mass
5.15 Endrin aldehyde 0
0
❑ Concentration
(7421-93-4) Mass
5.16 Heptachlor El 0
0 Concentration
(76-44-8) Mass
Heptachlor epoxide Concentration
5.17 (1024-57-3) El
0
Mass
PCB-1242 Concentration ug/L <0.40
5.18 0 ❑ g 1 <0.40 1
(53469 21 9) Mass lb/Day <4.88 1
PCB-1254 Concentration ug/L <0.40
5.19 (11097 69 1) 0 0 0
Mass lb/Day <4.88
1
PCB-1221 Concentration ug/L <0.40
El El El
1 <0.40 1
5.20 (11104-28-2)
Mass lb/Day <4.88 1
PCB-1232 Concentration u /L <0.40
5.21 (11141-16-5) 0 El 1 <0.40 1
Mass lb/Day <4.88 1
PCB-1248 Concentration u /L <0.40
5.22 (12672-29-6) 0 0 0 g 1 <0.40 1
Mass lb/Day <4.88 1
PCB-1260 Concentration ug/L <0.40
5.23 (11096-82-5) 0 0 ❑✓ g/ 1 <0.40 1
Mass lb/Day <4.88 1
PCB-1016 Concentration u
5.24 (12674-11-2) 0 El0g/L <0.4o 1 <0.40 1
Mass lb/Day <4.88 1
EPA Form 3510-2C(Revised 3-19) Page 20

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station ow. OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Long-
DailyMonthlyAverage Number Number
Present Absent Term
Discharge Discharge Daily of Average of
(required) (if available) Discharge Analyses Value Analyses
(if available)_
Toxaphene Concentration
5.25 (8001-35-2) ❑ ❑ ✓❑
Mass
1 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 3510-2C(Revised 3-19) Page 21

This page intentionally left blank.

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE C.CERTAIN CONVENTIONAL AND NON CONVENTIONAL POLLUTANTS(40 CFR 122.21(g)(7)(vi))l
Presence or Absence
(check one) Effluent Intake
(Optional)
Pollutant Units Maximum Long-Term
Believed Believed (specify) Maximum Daily Long-Term
Present Absent Discharge Monthly Average Daily Number of Average Number of
• (required) Discharge Discharge Analyses Analyses
(if available) (if available) Value
Check here if you believe all pollutants on Table C to be present in your discharge from the noted outfall.You need not complete the`Presence or Absence"column of Table C for
each pollutant.
❑ Check here if you believe all pollutants on Table C to be absent in your discharge from the noted outfall.You need not complete the`Presence or Absence"column of Table C for
each pollutant.
1.
Bromide ❑✓ 0 Concentration mg/L <0.1 1 0.11 1
(24959-67-9) Mass lb/Day <1220.0 1
2 Chlorine,total O Concentration mg/L <0.050 1 <0.050 1
residual Mass lb/Day <610.0 1
3. Color Concentration mg/L 15 1 15 1
Mass lb/Day NA 1
4. Fecal coliform ❑✓ Concentration MPN/100 12.1 1 12 1 I
Mass lb/Day NA 1
5 Fluoride 0 0Concentration mg/L <0.1 1 <0.1 1
(16984-48-8) Mass lb/Day <1220.0 1
6 Nitrate nitrite 0Concentration mg-N/L 0.46 1 0.45 1
El
Mass lb/Day 5620.0 1
7 Nitrogen,total Concentration mg/L 0.20 1 0.22 1
organic(as N) Mass . lb/Day 2440.0 1
8. Oil and grease Concentration mg/L <5 1 <5 1
Mass lb/Day <61000 1
9 Phosphorus(as Concentration mg/L 0.026 1 0.056 1
P),total(7723-14-0) Mass lb/Day 317 1
10. Sulfate(as SO4) Concentration mg/L 3.4 1 4.7 1
0 0
(14808-79-8) Mass lb/Day 41500 1
11. Sulfide(as S) Concentration mg/L 1.2 1 <1.0 1
Mass lb/Day 14700 1
EPA Form 3510-2C(Revised 3-19) Page 23

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE C.CERTAIN CONVENTIONAL AND NON CONVENTIONAL POLLUTANTS(40 CFR 122.21(g)(7)(vi))1
Presence or Absence
(check one) Effluent Intake
(Optional)
Pollutant Units Maximum Long-Term
Believed Believed (specify) Maximum Daily Long-Term
Monthly Average Daily Number of Average Number of
Present Absent Discharge
(required) Discharge Discharge Analyses Value Analyses
(if available) (if available)
12. Sulfite(as SO3) ❑ ❑✓ Concentration mg/L <2.0 1 <2.0 1
(14265-45-3) Mass lb/Day <24400 1
13. Surfactants ❑✓ ElConcentration ' mg/L 1.1 1 0.076 1
Mass lb/Day 13,421 1
14.
Aluminum,total ❑ 0
Concentration mg/L 0.694 1 0.764 1
(7429-90-5) Mass lb/Day 8470.0 1
15. Barium,total ✓❑ 0 Concentration mg/L 0.015 1 0.017 1
(7440-39-3) Mass lb/Day 183 1
16. Boron,total ❑✓ ❑ Concentration mg/L 0.060 1 0.157 1
(7440-42-8) Mass lb/Day 733.0 1
Cobalt,total ❑ ❑ Concentration ug/L <1 1 <1 1
17. (744048 4)
Mass lb/Day <12.2 1
18.
Iron,total ❑ ❑ Concentration mg/L 0.644 1 0.686 1
(7439-89-6) Mass lb/Day 7860 1
19.
Magnesium,total ❑ 0 Concentration mg/L 1.79 1 2.64 1
(7439-95-4) Mass lb/Day 21900 1
Molybdenum, Concentration mg/L <1 1 <1 1
20. total ❑ ❑✓
(7439-98-7) Mass lb/Day <12.2 1
21. Manganese,total ❑✓ ❑ Concentration mg/L 0.038 1 0.052 1
(7439-96-5) Mass lb/Day 464.0 1
22 Tin total ❑ ❑✓ Concentration , mg/L <0.01 1 <0.01 1
(7440-31-5) Mass lb/Day <122 1
23. Titanium,total ❑ ❑ Concentration mg/L 0.019 1 0.02 1
(7440-32-6) Mass lb/Day232
1
i
EPA Form 3510-2C(Revised 3-19) Page 24

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE C.CERTAIN CONVENTIONAL AND NON CONVENTIONAL POLLUTANTS(40 CFR 122.21(g)(7)(vi))'
Presence or Absence
(check one) Effluent Intake
(Optional)
Pollutant Units Maximum Long-Term
Believed Believed (specify) Maximum Daily Long-Term
Monthly Average Daily Number of Average Number of
Present Absent Discharge
(required) Discharge Discharge Analyses Value Analyses
(if available) (if available)
24. Radioactivity
Alpha,total Concentration
Mass
Beta,total Concentration
Mass
Radium,total Concentration '
Mass
Radium 226,total Concentration
Mass
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 3510-2C(Revised 3-19) Page 25

This page intentionally left blank.

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE D.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(g)(7)(vii))1
Presence or Absence
Pollutant (check one) Available Quantitative Data
Believed Believed Reason Pollutant Believed Present in Discharge
(specify units)
Present Absent
1. Asbestos ❑ ❑✓
2. Acetaldehyde 0 0
3. Allyl alcohol 0 0
4. Allyl chloride 0 0
5. Amyl acetate 0 0
6. Aniline ❑ 0
7. Benzonitrile ❑ 0
8. Benzyl chloride 0 0
9. Butyl acetate 0 0
10. Butylamine ❑ 0
11. Captan ❑ ❑✓
12. Carbaryl 0 0
13. Carbofuran 0 0
14. Carbon disulfide ❑ 0
15. Chlorpyrifos ❑ 0
16. Coumaphos 0 0
17. Cresol 0 0
18. Crotonaldehyde 0 0
19. Cyclohexane ❑ 0
EPA Form 3510-2C(Revised 3-19) Page 27

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE D.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 12221(g)(7)(vii))l
Presence or Absence
Pollutant (check one) Reason Pollutant Believed Present in Discharge Available Quantitative Data
Believed Believed g (specify units)
Present Absent
20. 2,4-D(2,4-dichlorophenoxyacetic acid) ❑ ❑✓
21. Diazinon ❑ ✓❑
22. Dicamba ❑ ❑✓
23. Dichlobenil 0 ❑✓
24. Dichlone ❑ ✓❑
25. 2,2-dichloropropionic acid 0 ❑✓
26. Dichlorvos ❑ ❑✓
27. Diethyl amine 0 ✓❑
28. Dimethyl amine ❑ ❑✓
29. Dintrobenzene 0 ❑✓
30. Diquat •
❑
31. Disulfoton ❑ ❑✓
32. Diuron ❑ ❑✓
33. Epichlorohydrin ❑
34. Ethion ❑ ✓❑
35. Ethylene diamine 0 ❑✓
36. Ethylene dibromide 0 ❑✓
37. Formaldehyde ❑ ✓❑
38. Furfural ❑
EPA Form 3510-2C(Revised 3-19) Page 28

EPA Identification Number NPDES Permit Number
FacilityName Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE D.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(g)(7)(vii))1
Presence or Absence
Pollutant (check one) Available Quantitative Data
Believed Believed Reason Pollutant Believed Present in Discharge
(specify units)
Present Absent
39. Guthion CI • 0
40. Isoprene 0 0
41. Isopropanolamine 0 0
42. Kelthane CI 0
43. Kepone CI 0
44. Malathion 0 CI
45. Mercaptodimethur 0 0
46. Methoxychlor CI 0
47. Methyl mercaptan 0 0
48. Methyl methacrylate 0 0
49. Methyl parathion CI 0
50. Mevinphos 0 0
51. Mexacarbate CI 0
•52. Monoethyl amine 0
53. Monomethyl amine 0 0
54. Naled 0 0
55. Naphthenic acid CI 0
56. Nitrotoluene CI 0
57. Parathion 0 0
EPA Form 3510-2C(Revised 3-19) Page 29

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE D.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 12221(g)(7)(vii))l
Presence or Absence
Pollutant (check one) Reason Pollutant Believed Present in Discharge Available Quantitative Data
Believed Believed (specify units)
Present Absent
58. Phenolsulfonate ❑ ✓❑
59. Phosgene ❑ ❑✓
60. Propargite ❑ • ✓❑
61. Propylene oxide ❑ ✓❑
62. Pyrethrins ❑ ❑✓
63. Quinoline ❑ ❑✓
64. Resorcinol ❑ ❑✓
65. Strontium ❑ ❑✓
66. Strychnine ❑ ❑✓
67. Styrene ❑ ❑✓
2,4,5-T(2,4,5-trichlorophenoxyacetic ❑ ❑
68. acid)
69. TDE(tetrachlorodiphenyl ethane) ❑ ❑✓
70 2,4,5-TP[2-(2,4,5-trichlorophenoxy) ❑ ❑
propanoic acid]
71. Trichlorofon ❑ ✓❑
72. Triethanolamine ❑ ✓❑
73. Triethylamine ❑ ❑✓
74. Trimethylamine ❑ ❑✓
75. Uranium 0 ❑✓
76. Vanadium ❑ ✓❑
EPA Form 3510-2C(Revised 3-19) Page 30

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE D.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(g)(7)(vii))1
Presence or Absence
Pollutant (check one) Available Quantitative Data
Believed Believed Reason Pollutant Believed Present in Discharge
(specify units)
Present Absent
77. Vinyl acetate ❑ ✓0
78. Xylene ❑ ✓0
79. Xylenol
80. Zirconium �
1 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 3510-2C(Revised 3-19) Page 31

This page intentionally left blank.

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 001 OMB No.2040-0004
TABLE E.2,3,7,8 TETRACHLORODIBENZO P DIOXIN(2,3,7,8 TCDD)(40 CFR 122.21(g)(7)(viii))
TCDD Presence or
Congeners Absence
Pollutant Used or (check one) Results of Screening Procedure
Manufactured Believed Believed
Present Absent
2,3,7,8-TCDD ❑ ❑ ✓❑
EPA Form 3510-2C(Revised 3-19) Page 33

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE A.CONVENTIONAL AND NON CONVENTIONAL POLLUTANTS(40 CFR 122.21(g)(7)(iii))1
Effluent Intake
Waiver Units Maximum Maximum Long-Term (Optional)
Pollutant Requested
(if applicable) (specify) Daily Monthly Average Daily Number of Long-Term Number of
Discharge Discharge Discharge Analyses Average Value Analyses
(required) (if available) (if available)
❑ Check here if you have applied to your NPDES permitting authority for a waiver for all of the pollutants listed on this table for the noted outfall.
Biochemical oxygen demand Concentration mg/L <2.0 1 <2.0 1
1' El(BOOS)
Mass lb/Day <49.7 1
Chemical oxygen demand Concentration mg/L <20 1 <20.0 1
2' ❑(COD)
Mass lb/Day <497.0 1
Concentration mg/L 1.8 1 1.4 1
3. Total organic carbon(TOC) ❑
Mass lb/Day 44.8 1
Concentration mg/L <2.5 1 5.7 1
4. Total suspended solids(TSS) ❑
Mass 'lb/Day <62.2 1
Concentration mg-N/L 0.063 1 0.026 1
5. Ammonia(as N) ❑
Mass lb/Day 1.57 1
6. Flow ❑ Rate MGD 2.98 1
Temperature(winter) ❑ °C °C 7.8 1 8.4 1
7.
Temperature(summer) ❑ °C °C
pH(minimum) ❑ Standard units S.U. 6.3 1 6.9 1
8.
pH(maximum) ❑ Standard units S.U. 6.3 1 6.9 1
1 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 3510-2C(Revised 3-19)
Page 9

This page intentionally left blank.

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Long-
MonthlyAverage Number Number
Present Absent Daily Term
Discharge Discharge Discharge a Analyaily ses Average Analyses
(required) (if available) g Value Yes
(if available)
Check here if you qualify as a small business per the instructions to Form 2C and,therefore,do not need to submit quantitative data for any of the organic toxic pollutants in Sections
2 through 5 of this table. Note,however,that you must still indicate in the appropriate column of this table if you believe any of the pollutants listed are present in your discharge.
Section 1.Toxic Metals,Cyanide,and Total Phenols
1.1 Antimony,total ID a Concentration ug/L 1.11 1 <1 1
(7440-36-0) Mass Ib/Day 0.0276 1
Arsenic,total Concentration ug/L 8.46 1 <1 1
1.2 El
(7440-38-2) 0 Mass lb/Day 0.21 1
1,3 Beryllium,total Concentration ug/L <1 1 <1 1
(7440-41-7) Mass lb/Day <0.0249 1
1.4 Cadmium,total Concentration ug/L <0.1 1 <0.1 1
El 1=I(7440-43-9) Mass lb/Day <0.00249 1
1.5 Chromium,total Concentration ug/L <1 1 <1 1
El El(7440-47-3) Mass lb/Day <0.0249 1
1.6 Copper,total Concentration ug/L 1.11 1 1.04 1
(7440-50-8) Mass lb/Day 0.0276 1
1.7 Lead,total Concentration ug/L <1 1 <1 1
El(7439-92-1) Mass lb/Day <0.0249 1
1 8 Mercury,total Concentration ng/L 0.848 1 1.03 1
El 1:1(7439-97-6) Mass lb/Day 0.0000211 1
1.9 Nickel,total Concentration ug/L 6.18 1 <1 1
El El(7440-02-0) Mass lb/Day 0.154 1
Selenium,total � Concentration ug/L 6.67 1 <1 1
1.10 (7782-49-2) Mass lb/Day 0.166 1
1.11 Silver,total © Concentration ug/L <1 1 <1 1
0
(7440-22-4) Mass lb/Day <0.0249 1
EPA Form 3510-2C(Revised 3-19)
Page 11

•
EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
Long-
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum DailyMonthlyAverage Number Term Number
Present Absent
Discharge Discharge Daily of Average of
(required) (if available) Discharge Analyses Value Analyses
(if available)
1.12 Thallium,total Concentration ug/L 0.308 1 <0.2 1
ID ElEl
(7440-28-0) Mass lb/Day 0.00766 1
1.13 Zinc,total ❑ Concentration mg/L <0.005 1 <0.005 1
IEI
(7440-66-6) Mass lb/Day <0.124 1
1.14 Cyanide,total Concentration mg/L <0.01 1 <0.01 1
El ElrEl
(57-12-5) Mass lb/Day <0.249 1
1.15 Phenols,total �✓ ❑ Concentration ug/L <1.6 1 <1.6 1
Mass lb/Day <0.0398 1
Section 2.Organic Toxic Pollutants(GC/MS Fraction-Volatile Compounds)
21 Acrolein Concentration ug/L <5.0 1 <1.0 1
(107-02-8) Mass lb/Day <0.124 1
2.2 Acrylonitrile Concentration ug/L <5.0 1 <1.0 1
(107-13-1) Mass lb/Day <0.124 1
2.3 Benzene Concentration ug/L <1.0 1 " <1.0 1
(71-43-2) Mass lb/Day <0.0249 1
2.4 Bromoform ❑✓ Concentration ug/L <1.0 1 <1.0 1
IEI
(75-25-2) Mass lb/Day <0.0249 1
2.5 Carbon tetrachloride Concentration ug/L <1.0 1 <1.0 1
lE1 ElEl
(56-23-5) Mass lb/Day <0.0249 1
2.6 Chlorobenzene Concentration ug/L <1.0 1 <1.0 1
El I:IlEl
(108-90-7) Mass lb/Day <0.0249 1
2.7 Chlorodibromomethane Concentration ug/L <1.0 1 <1.0 1
El 00
(124-48-1) Mass lb/Day <0.0249 1
2.8 Chloroethane © Concentration ug/L <2.0 1 <2.0 1
0
(75-00-3) Mass lb/Day 0.0497 1
EPA Form 3510-2C(Revised 3-19) Page 12

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Long-
(and DailyMonthlyAverage Number Term Number
Present Absent
of of
Discharge Discharge
Daily
i charge Analyses Average Analyses
(required) aailabl
q ) (if available) Value
2.9 2-chloroethylvinyl ether 0Concentration ug/L <5.0 1 <5.0 1
El 0
(110-75-8) Mass lb/Day <0.124 1
2.10 Chloroform(67 66 3) 00Concentration ug/L <1.0 1 <1.0 1
Mass lb/Day <0.0249 1
2.11 Dichlorobromomethane 0Concentration ug/L <1.0 1 <1.0 1
(75-27-4) Mass lb/Day <0.0249 1
2.12 1,1-dichloroethane 0Concentration ug/L <1.0 1 <1.0 1
(75-34-3) Mass Ib/Day <0.0249 1
2.13 1,2-dichloroethane 0Concentration ug/L <1.0 1 <1.0 1
(107-06-2) Mass lb/Day <0.0249 1
2.14 11-dichloroethylene 0Concentration ug/L <1.0 1 <1.0 1
El El
(75-35-4) Mass lb/Day <0.0249 1
215 1,2-dichloropropane Q Concentration ug/L <1.0 1 <1.0 1
(78-87-5) Mass lb/Day <0.0249 1
2.16 13-dichloropropylene 0Concentration ug/L <1.0 1 <1.0 1
(542-75-6) Mass lb/Day <0.0249 1
217 Ethylbenzene 0Concentration ug/L <1.0 1 <1.0 1
(100-41-4) Mass lb/Day <0.0249 1
2.18 Methyl bromide 0Concentration ug/L <2.0 1 <24.4 1
El El
(74-83-9) Mass lb/Day <0.0497 1
2.19 Methyl chloride Concentration ug/L <2.0 1 <24.4 1
(74-87-3) Mass lb/Day <0.0497 1
2.20 Methylene chloride Concentration ug/L <1.0 1 <1.0 1
El 0 El
(75-09-2) Mass Ib/Day <0.0249 1
2.21 1,1,2,2-tetrachloroethane IIIConcentration ug/L <1.0 1 <1.0 1
0DI
(79-34-5) Mass Ib/Day <0.0249 1
EPA Form 3510-2C(Revised 3-19) Page 13

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
Long-
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum DailyMonthlyAverage NumberNumber
Present Absent Dailyof Term of
Discharge Discharge Average
(required) (if available) Discharge Analyses Value Analyses
(if available)
2.22 Tetrachloroethylene Concentration ug/L <1.0 1 <1.0 1
El
(127-18-4) Mass lb/Day <0.0249 1
2.23 Toluene Concentration ug/L <1.0 1 <1.0 1
(108-88-3) Mass lb/Day <0.0249 1
2.24 1,2-trans-dichloroethylene El ❑✓ Concentration ug/L <1.0 1 <1.0 1
(156-60-5) Mass lb/Day <0.0249 1
2.25 1,1,1-trichloroethane Concentration ug/L <1.0 1 <1.0 1
0 El(71-55-6) Mass lb/Day <0.0249 1
2.26 1,1,2-trichloroethane Concentration ug/L <1.0 1 <1.0 1
(79-00-5) Mass lb/Day <0.0249 1
2.27 Trichloroethylene Concentration ug/L <1.0 1 <1.0 1
El 0El
(79-01-6) Mass lb/Day <0.0249 1
2.28 Vinyl chloride 0 0 0
ug/L <1.0 1 <1.0 1
(75-01-4) Mass lb/Day <0.0249 1
Section 3.Organic Toxic Pollutants(GC/MS Fraction-Acid Compounds)
3.1 2-chlorophenol Concentration ug/L <1.6 1 <1.6 1
(95-57-8) Mass Ib/Day <0.0398 1
3.2 2 4-dichlorophenol 0Concentration ug/L <1.6 1 <1.6 1
0 El
(120-83-2) Mass Ib/Day <0.0398 1
3.3 2,4-dimethylphenol Concentration ug/L <1.6 1 <1.6 1
0 0
(105-67-9) Mass lb/Day <0.0398 1
3.4 4,6-dinitro-o-cresol Concentration ug/L <8.0 1 <8.0 1
0 00
(534-52-1) Mass lb/Day <0.199 1
3.5 2,4-dinitrophenol pi Concentration ug/L <8.0 1 <8.0 1
0 0
(51-28-5) Mass lb/Day <0.199 1
EPA Form 3510-2C(Revised 3-19) Page 14

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Average Number Long- Number
Present Absent Daily Monthly Term
Daily of of
(sceq iced) (if available) Drgischarge
ischarge Analyses
Value Average Analyses
(if available)
3.6 2-nitrophenol D Concentration ug/L <3.2 1 <3.2 1
(88-75-5) Mass lb/Day <0.0796 1
3.7 4-nitrophenol Concentration ug/L <8.0 1 <8.0 1
El El(100-02-7) Mass lb/Day <0.199 1
3.8 p chloro m cresol 0 0 0 Concentration ug/L <1.6 1 <1.6 1
(59-50-7) Mass lb/Day <0.0398 1
3.9 Pentachlorophenol I:I a Concentration ug/L <8.0 1 <8.0 1
El
(87-86-5) Mass lb/Day <0.199 <0.199 1
3.10 Phenol 0 Concentration ug/L <0.0050 1 <0.005 1
(108-95-2) Mass lb/Day <0.124 1
3.11 2,4,6-trichlorophenol Concentration ug/L <1.6 1 <1.6 1
El 0El
(88-05-2) Mass lb/Day <0.0398 1
Section 4.Organic Toxic Pollutants(GC/MS Fraction-Base/Neutral Compounds)
4.1 Acenaphthene Concentration ug/L <1.6 1 <1.6 1
(83-32-9) Mass lb/Day <0.0398 1
4.2 Acenaphthylene Concentration ug/L <1.6 1 <1.6 1
(208-96-8) Mass lb/Day <0.0398 1
4.3 Anthracene Concentration ug/L <1.6 1 <1.6 1
(120-12-7) Mass lb/Day <0.0398 1
4.4 Benzidine Concentration ug/L <8.0 1 <8.0 1
(92-87-5) Mass lb/Day <0.199 1
4.5 Benzo(a)anthracene Concentration ug/L <1.6 1 <1.6 1
(56-55-3) Mass lb/Day <0.0398 1
4.6 Benzo(a)pyrene Concentration ug/L <1.6 1 <1.6 1
El 0(50-32-8) Mass lb/Day <0.0398 1
EPA Form 3510-2C(Revised 3-19)) Page 15

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence Intake
(check one) Effluent
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (speci Maximum Maximum Long-
) DailyMonthlyAverage Number Term Number
Present Absent
( aily of of
Drequired)
eq iced) (if available) DisDcharge Analyses Averageischarge Value Analyses
(if available)
4.7 3,4-benzofluoranthene Concentration ug/L <1.6 1 <1.6 1
(205-99-2) Mass lb/Day <0.0398 1
4.8 Benzo(ghi)perylene Concentration ug/L <1.6 1 <1.6 1
El 0 El
(191-24-2) Mass lb/Day <0.0398 1
Benzo(k)fluoranthene ❑ ❑ Concentration ug/L <1.6 1 <1.6 1
4'9 (207-08-9) Mass lb/Day <0.0398 1
Bis(2-chloroethoxy)methane Concentration ug/L <1.6 1 <1.6 1
4.10 (111 91 1) Mass lb/Day <0.0398 1
Bis(2-chloroethyl)ether Concentration ug/L <1.6 1 <1.6 1
4.11 (111-44-4) El 0 Mass lb/Day <0.0398 1
4.12 Bis(2-chloroisopropyl)ether 0 Concentration
El 0
(102-80-1) Mass
4.13 Bis(2-ethylhexyl)phthalate Concentration ug/L <8.0 1 1
El El 0
(117-81-7) Mass lb/Day <0.199 1
4.14 4-bromophenyl phenyl ether Concentration ug/L <1.6 1 <1.6 1
(101-55-3) Mass lb/Day <0.0398 1
Butyl benzyl phthalate Concentration ug/L <1.6 1 <1.6 1
4.15 0 El El
(85 68 7) Mass lb/Day <0.0398 1
4.16 2-chloronaphthalene Concentration ug/L <1.6 1 <1.6 1
(91-58-7) Mass lb/Day <0.0398 1
4.17 4-chlorophenyl phenyl ether Concentration ug/L <1.6 1 <1.6 1
0 El El
(7005-72-3) Mass lb/Day <0.0398 1
4.18 Chrysene Concentration ug/L <1.6 1 <1.6 1
(218-01-9) Mass lb/Day <0.0398 1
4.19 Dibenzo(a,h)anthracene Concentration ug/L <1.6 1 <1.6 1
(53-70-3) Mass lb/Day <0.0398 1
EPA Form 3510-2C(Revised 3-19) Page 16

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Average Number Long- Number
Present Absent Daily Monthly Term
of of
Discharge(required)
D De isDcharge Analyses Average Analyses
(if available) (if available) Value
4.20 1,2-dichlorobenzene Concentration ug/L <1.0 1 <1.0 1
(95-50-1) Mass lb/Day <0.0249 1
4.21 1,3-dichlorobenzene Concentration ug/L <1.0 1 <1.0 1
El El(541-73-1) Mass lb/Day <0.0249 1
4.22 1,4-dichlorobenzene ✓o Concentration ug/L <1.0 1 <1.0 1
(106-46-7) Mass lb/Day <0.0249 1
4.23 3,3-dichlorobenzidine ElConcentration ug/L <8.0 1 <8.0 1
(91-94-1) Mass lb/Day <0.199 1
4.24 Diethyl phthalate © Concentration ug/L <1.6 1 <1.6 1
El El
(84-66-2) Mass lb/Day <0.0398 1
4.25 Dimethyl phthalate 0Concentration ug/L <1.6 1 <1.6 1
1:1El
(131-11-3) Mass lb/Day <0.0398 1
4.26 Di-n-butyl phthalate ElConcentration ug/L <1.6 1 <1.6 1
1=I El(84-74-2) Mass lb/Day <0.0398 1
4.27 2,4-dinitrotoluene Concentration ug/L <1.6 1 <1.6 1
(121-14-2) Mass lb/Day <0.0398 1
4.28 2,6-dinitrotoluene ❑ ❑ Concentration ug/L <1.6 1 <1.6 1
El
(606-20-2) Mass lb/Day <0.0398 1
4.29 Di-n-octyl phthalate Concentration ug/L <1.6 1 <1.6 1
El El 1=1
(117-84-0) Mass lb/Day <0.0398 1
4.30 1,2-Diphenylhydrazine 1=1 Concentration
(as azobenzene)(122-66-7) Mass
4.31 Fluoranthene Concentration ug/L <1.6 1 <1.6 1
(206-44-0) Mass lb/Day <0.0398 1
4.32 Fluorene Concentration ug/L <1.6 1 <1.6 1
(86-73-7) Mass lb/Day <0.0398 1
EPA Form 3510-2C(Revised 3-19) Page 17

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Long-
MonthlyAverage Number Term Number
Present Absent Daily
Dischargeof of
Discharge
aily
Di Dharge Analyses Average Analyses
(required)
(if available) Value
4.33 Hexachlorobenzene Concentration ug/L <1.6 1 <1.6 1
(118-74-1) Mass lb/Day <0.0398 1
4.34 Hexachlorobutadiene Concentration ug/L <1.6 1 <1.6 1
(87-68-3) Mass lb/Day <0.0398 1
4.35 Hexachlorocyclopentadiene Concentration ug/L <8.0 1 1
El El(77-47-4) Mass lb/Day <0.199 1
4.36 Hexachloroethane Concentration ug/L <1.6 1 <1.6 1
El El(67-72-1) Mass lb/Day <0.0398 1
4.37 Indeno(1,2,3-cd)pyrene Concentration ug/L <1.6 1 <1.6 1
(193-39-5) Mass lb/Day <0.0398 1
4.38 Isophorone Concentration ug/L <1.6 1 <1.6 1
(78-59-1) Mass lb/Day <0.0398 1
4.39 Naphthalene Concentration ug/L <1.6 1 <1.6 1
(91-20-3) Mass lb/Day <0.0398 1
4.40 Nitrobenzene Concentration ug/L <1.6 1 <1.6 1
(98-95-3) Mass lb/Day <0.0398 1
4.41 N-nitrosodimethylamine Concentration ug/L <1.6 1 <1.6 1
El El(62-75-9) Mass lb/Day <0.0398 1
4.42 N-nitrosodi-n-propylamine � Concentration ug/L <1.6 1 <1.6 1
(621-64-7) Mass lb/Day <0.0398 1
4.43 N-nitrosodiphenylamine Concentration ug/L <1.6 1 <1.6 1
0 ElEl
(86-30-6) Mass lb/Day <0.0398 1
4.44 Phenanthrene Concentration ug/L <1.6 1 <1.6 1
(85-01-8) Mass lb/Day <0.0398 1
4.45 Pyrene Concentration ug/L <1.6 1 <1.6 1
El 0(129-00-0) Mass lb/Day <0.0398 1
EPA Form 3510-2C(Revised 3-19) Page 18

EPA Identification Number NPDES Permit Number Facility Name Ouffall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Long-
MonthlyAverage Number Number
Present Absent Daily Dailyof Term of
Discharge Discharge Average
(required) (if available) Discharge Analyses Value Analyses
(if available)
4.46 12,4-trichlorobenzene 0Concentration ug/L <1.6 1 <1.6 1
(120-82-1) Mass lb/Day <0.0398 1
Section 5.Organic Toxic Pollutants(GC/MS Fraction—Pesticides) •
5.1 Aldrin ✓0 Concentration
(309-00-2) Mass
5.2 a-BHC Concentration
(319-84-6) Mass
5.3 R-BHC 00 Concentration
(319-85-7) Mass
5.4 Y-BHC ✓❑ Concentration
El
(58-89-9) Mass
5.5 6-BHC El Concentration
0 El
(319-86-8) Mass
5 6 Chlordane ✓❑ Concentration
0
(57-74-9) 0 Mass
5.7 4,4'-DDT ✓� Concentration
00
(50-29-3) Mass
5.8 4 4'-DDE 0 ❑ Concentration
0
(72-55-9) Mass
5.9 4,4'-DDD E✓ Concentration
00
(72-54-8) Mass
5.10 Dieldrin Concentration
0(60-57-1) 0 Mass
5.11 a-endosulfan Concentration
0(115-29-7) Mass
EPA Form 3510-2C(Revised 3-19) Page 19
L -

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term _
(and CAS Number,if available) Required Believed Believed Maximum Maximum Long-
(and DailyMonthlyAverage Number g Number
Present Absent �) Dailyof Term of
Discharge Discharge Discharge AnalysesAverage
g Analyses
(required) (if available) Value y
(if available)
5.12 R-endosulfan El ❑ ❑ Concentration
(115-29-7) Mass
5.13 Endosulfan sulfate ❑ ❑ ❑ Concentration
(1031-07-8) Mass
5.14 Endrin 0 Concentration
(72-20-8) El ❑
Mass
5.15 Endrin aldehyde 0 Concentration
(7421-93-4) El ❑
Mass
5.16 Heptachlor 0 Concentration
(76-44-8) El ❑
Mass
Heptachlor epoxide Concentration
5.17 (1024-57-3) ❑ 0 ❑✓
Mass
PCB-1242 Concentration u /L <0.40
5.18 (53469-21-9) 0 ❑ Elg 1 <0.40 1
Mass lb/Day <4.88 1
PCB-1254 Concentration ug/L <0.40
5.19 0 ❑ g/ 1 <0.40 1
(11097 69 1) Mass lb/Day <4.88
1
PCB-1221 Concentration ug/L <0.40
5.20 (11104-28-2) 0 0 0 g/ 1 <0.40 1
Mass lb/Day <4.88 1
PCB-1232 Concentration ug/L(11141-16-5) 0 0 0g/L <0.40 1 <0.40 1
Mass lb/Day <4.88 1
PCB-1248 Concentration u /L <0.40
5.22 (12672-29-6) El 0g 1 <0.40 1
Mass lb/Day <4.88 1
PCB-1260 Concentration u
5.23 (11096-82-5) 0 El0g/L <0.40 1 <0.40 1
Mass lb/Day <4.88 1
PCB-1016 Concentration ug/L <0.40
5.24 ❑ ❑ g/ 1 <0.40 1
(12674 11 2) Mass lb/Day <4.88
1
EPA Form 3510-2C(Revised 3-19) Page 20

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE B.TOXIC METALS, CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed BelievedMaximum Maximum Lon
(specify) DailyMonthlyAverage Number Long-
(and
Present Absent Dailyof Term of
Discharge Discharge Discharge Analyses Average Analyses
(required) (if available) g y Value
(if available)
Toxaphene Concentration
5.25 (8001-35-2) ❑ ❑ ✓❑
Mass
1 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 3510-2C(Revised 3-19)
Page 21

This page intentionally left blank.

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE C.CERTAIN CONVENTIONAL AND NON CONVENTIONAL POLLUTANTS(40 CFR 122.21(g)(7)(vi))l
Presence or Absence
(check one) Effluent Intake
(Optional)
Pollutant Units Maximum Lon
Believed Believed Long-Term
(specify) Maximum Daily MonthlyAverageDaily Long-Term
Present Absent Discharge Number of Average Number of
(required) Discharge Discharge Analyses Analyses
(if available) (if available) Value
❑ Check here if you believe all pollutants on Table C to be present in your discharge from the noted outfall.You need not complete the"Presence or Absence"column of Table C for
each pollutant.
❑ Check here if you believe all pollutants on Table C to be absent in your discharge from the noted outfall.You need not complete the"Presence or Absence"column of Table C for
each pollutant.
1.
Bromide ✓❑ ❑ Concentration mg/L 1.8 1 0.11 1
(24959-67-9) Mass lb/Day 44.8 1
2 Chlorine,total 0 ❑ Concentration mg/L <0.050 1 <0.050 1
residual Mass lb/Day <1.24 1
3. Color ❑ Concentration mg/L 5.0 1 15 1
Mass lb/Day NA 1
4. Fecal coliform 0 0 Concentration MPN/loo 5.2 1 12 1
Mass lb/Day NA 1
5 Fluoride ❑✓ 0 Concentration mg/L 0.77 1 <0.1 1
(16984-48-8) Mass lb/Day 19.1 1
6 Nitrate nitrite 0 ElConcentration mg-NIL 0.48 1 0.45 1
Mass lb/Day 11.9 1
7 Nitrogen,total 0 0 Concentration mg-N/L 0.35 1 0.22 1
organic(as N) Mass lb/Day 8.7 1
8. Oil and grease 0Concentration mg/L <5 1 <5 1
Mass lb/Day <124 1
g Phosphorus(as 00 Concentration mg/L 0.018 1 0.056 1
P),total(7723-14-0) Mass lb/Day 0.448 1
10. Sulfate(as SO4) 0 Concentration mg/L 200 1 4.7 1
14808-7 0
( 9-8) Mass lb/Day 4970 1
11. Sulfide(as S) ❑✓ ElConcentration mg/L 1.6 1 <1.0 1
Mass lb/Day 39.8 1
• EPA Form 3510-2C(Revised 3-19) Page 23

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE C.CERTAIN CONVENTIONAL AND NON CONVENTIONAL POLLUTANTS(40 CFR 122.21(g)(7)(vi))1
Presence or Absence
(check one) Effluent Intake
(Optional)
Pollutant Units Maximum Long-Term
BePresent Absent (specify) Maximum Daily Monthly Average Daily Number of Long-Term Number of
Discharge Dischard) ge Discharge Analyses Average Analyses
(if available) (if available) Value
12. Sulfite(as SO3) ❑ ❑✓ Concentration mg/L <2.0 1 <2.0 1
(14265-45-3) Mass lb/Day <49.7 1
13. Surfactants CI
mg/L 0.096 1 0.076 1
Mass lb/Day 2.386 1
14.
Aluminum,total ❑ CIConcentration mg/L 0.053 1 0.764 1
(7429-90-5) Mass lb/Day 1.32 1
15. Barium,total ❑✓ ❑ Concentration mg/L 0.088 1 0.017 1
(7440-39-3) Mass lb/Day 2.19 1
16. Boron,total ✓❑ ❑ Concentration mg/L 3.96 1 0.157 1
(7440-42-8) Mass lb/Day 98.5 1
Cobalt,total ❑ CIConcentration ug/L 2.54 1 <1 1
17.
(7440-48-4) Mass lb/Day 0.0632 1
18. Iron,total 0 ❑ Concentration mg/L 0.15 1 0.686 1
(7439-89-6) Mass lb/Day 3.73 1
19. Magnesium,total ❑✓ ❑ Concentration mg/L 28.9 1 2.64 1
(7439-95-4) Mass lb/Day 719 1
Molybdenum, Concentration mg/L 138 1 <1 1
20. total 0 CI
(7439-98-7) Mass lb/Day 3.43 1
21 Manganese,total O ❑ Concentration mg/L 0.780 1 0.052 1
(7439-96-5) Mass lb/Day 19.4 1
22.
Tin,total ❑ ❑ Concentration mg/L <0.01 1 <0.01 1
(7440-31-5) Mass lb/Day <0.249 1
23. Titanium,total ❑ 0 Concentration mg/L <0.005 1 0.02 1
(7440-32-6) Mass lb/Day <0.124 1
EPA Form 3510-2C(Revised 3-19) Page 24

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE C.CERTAIN CONVENTIONAL AND NON CONVENTIONAL POLLUTANTS(40 CFR 122.21(g)(7)(vi))l
Presence or Absence
(check one) Effluent Intake
(Optional)
Pollutant Units Maximum Long-Term
Believed Believed (specify) Maximum Daily Long-Term
Present Absent Discharge Monthly Average Daily Number of Average Number of
(required) Discharge Discharge Analyses Analyses
q ) (if available) (if available) Value
24. Radioactivity
Alpha,total Concentration
Mass
Beta,total 0 0Concentration
Mass
Radium,total ✓❑ Concentration
Mass
Radium 226,total ❑✓ Concentration
Mass
1 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 3510-2C(Revised 3-19) Page 25

This page intentionally left blank.

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE D.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(g)(7)(vii))1
Presence or Absence
Pollutant (check one) Available Quantitative Data
Believed Believed Reason Pollutant Believed Present in Discharge
(specify units)
Present Absent
1. Asbestos 0 0
2. Acetaldehyde 0 0
3. Allyl alcohol El 0
4. Allyl chloride El 0
5. Amyl acetate El 0
6. Aniline 0 0
7. Benzonitrile El 0
8. Benzyl chloride 0 0
9. Butyl acetate 0 0
10. Butylamine 0 0
11. Captan 0 0
12. Carbaryl El 0
13. Carbofuran El 0
14. Carbon disulfide 0 0
15. Chlorpyrifos El 0
1 16. Coumaphos 0 0
17. Cresol 0 0
18. Crotonaldehyde 0 0
19. Cyclohexane 0 0
EPA Form 3510-2C(Revised 3-19) Page 27

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE D.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 12221(g)(7)(vii))1
Presence or Absence
Pollutant (check one) Available Quantitative Data
Believed Believed Reason Pollutant Believed Present in Discharge
(specify units)
Present Absent
20. 2,4-D(2,4-dichlorophenoxyacetic acid) ❑ 0
21. Diazinon ❑ 0
22. Dicamba ❑ 0
23. Dichlobenil ❑ 0
24. Dichlone ❑ 0
25. 2,2-dichloropropionic acid ❑ 0
26. Dichlorvos 0 0
27. Diethyl amine 0 0
28. Dimethyl amine ❑ 0
29. Dintrobenzene 0 0
30. Diquat 0 0
31. Disulfoton ❑ 0
32. Diuron 0 0
33. Epichlorohydrin 0 0
34. Ethion 0 0
35. Ethylene diamine 0 0
36. Ethylene dibromide 0 0
37. Formaldehyde 0 0
38. Furfural 0 0
EPA Form 3510-2C(Revised 3-19) Page 28
II

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE D.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(g)(7)(vii))1
Presence or Absence
Pollutant (check one) Available Quantitative Data
Believed Believed Reason Pollutant Believed Present in Discharge
(specify units)
Present Absent
39. Guthion ❑ 0
40. Isoprene 0 0
41. Isopropanolamine 0 0
42. Kelthane 0 0
43. Kepone 0 0
44. Malathion 0 0
45. Mercaptodimethur 0 0 -
46. Methoxychlor 0 0
47. Methyl mercaptan 0 0
48. Methyl methacrylate 0 0
49. Methyl parathion 0
50. Mevinphos 0
51. Mexacarbate 0 0
52. Monoethyl amine 0 0
53. Monomethyl amine 0 0
54. Naled 0 0
55. Naphthenic acid 0 0
56. Nitrotoluene
57. Parathion
EPA Form 3510-2C(Revised 3-19)
Page 29

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE D.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(g)(7)(vii))1
Presence or Absence
Pollutant (check one) Available Quantitative Data
Believed Believed Reason Pollutant Believed Present in Discharge
specify units)
Present Absent
58. Phenolsulfonate ❑ • 0
59. Phosgene ❑ 0
60. Propargite ❑ 0
61. Propylene oxide ❑ 0
62. Pyrethrins ❑ 0
63. Quinoline ❑ 0
64. Resorcinol ❑ 0
65. Strontium 0 0
66. Strychnine ❑ 0
67. Styrene ❑ 0
68. 2,4 5-T(2,4,5-trichlorophenoxyacetic ❑
acid)
69. TDE(tetrachlorodiphenyl ethane) 0 0
70. 2,4,5-TP[2-(2,4,5-trichlorophenoxy) 0 0
propanoic acid]
71. Trichlorofon ❑ 0
72. Triethanolamine ❑ 0
73. Triethylamine 0 0
74. Trimethylamine ❑ 0
75. Uranium 0 0
76. Vanadium 0 0
EPA Form 3510-2C(Revised 3-19) Page 30

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE D.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(g)(7)(vii))1
Presence or Absence
Pollutant (check one) Reason Pollutant Believed Present in Discharge Available Quantitative Data
Believed Believed (specify units)
Present Absent
77. Vinyl acetate ❑ ✓❑
78. Xylene ❑
79. Xylenol ❑
80. Zirconium ❑ ✓❑
1 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 3510-2C(Revised 3-19) Page 31

This page intentionally left blank.

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 002 OMB No.2040-0004
TABLE E.2,3,7,8 TETRACHLORODIBENZO P DIOXIN(2,3,7,8 TCDD)(40 CFR 122.21(g)(7)(viii))
TCDD Presence or
Congeners Absence
Pollutant Used or (check one) Results of Screening Procedure
Manufactured Believed Believed
Present Absent
2,3,7,8-TCDD ❑ El
•
•
EPA Form 3510-2C(Revised 3-19) Page 33

EPA Identification Number NPDES Permit Number Facility Name Duffel!Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE A.CONVENTIONAL AND NON CONVENTIONAL POLLUTANTS(40 CFR 122.21(g)(7)(iii))I
Effluent Intake
Waiver Units Maximum Maximum Long-Term (Optional)
Pollutant Requested
(if applicable) (specify) Daily Monthly Average Daily Number of Long-Term Number of
Discharge Discharge Discharge Analyses Average Value Analyses
(required) (if available) (if available)
❑ Check here if you have applied to your NPDES permitting authority for a waiver for all of the pollutants listed on this table for the noted outfall.
Biochemical oxygen demand Concentration mg/L <2.0 1 <2.0 1
1. El(RODS)
Mass lb/Day <85.1 1
Chemical oxygen demand ❑ Concentration mg/L 65 1 <20.0 1
2' (COD)
Mass lb/Day 2770 1
Concentration mg/L 5.8 1 1.4 1
3. Total organic carbon(TOC) 0
Mass lb/Day 247 1
Concentration mg/L 2.5 1 5.7 1
4. Total suspended solids(TSS) 0
Mass Ib/Day 106 1
Concentration mg-N/L 5.8 1 0.026 1
5. Ammonia(as N) ❑
Mass lb/Day 247 1
6. Flow 0 Rate MGD 5.1 1
Temperature(winter) ❑ °C °C 1 8.4 1
7.
Temperature(summer) ❑ °C °C 24.8
pH(minimum) ❑ Standard units s.u. 7.6 1 6.9 1
8.
pH(maximum) 0 Standard units s.u. 7.6 1 6.9 1
1 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 3510-2C(Revised 3-19)
Page 9

This page intentionally left blank.

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
Long-
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum( p �) DailyMonthlyAverage NumberNumber
Present Absent Dailyof Term of
Discharge Discharge Average
(required) (if available) Discharge Analyses Value Analyses
(if available)
❑ Check here if you qualify as a small business per the instructions to Form 2C and,therefore,do not need to submit quantitative data for any of the organic toxic pollutants in Sections
2 through 5 of this table.Note,however,that you must still indicate in the appropriate column of this table if you believe any of the pollutants listed are present in your discharge.
Section 1.Toxic Metals,Cyanide,and Total Phenols
1.1 Antimony,total a 0 Concentration ug/L <1 1 <1 1
(7440-36-0) Mass lb/Day <0.0426 1
1.2 Arsenic,total Concentration ug/L <1 1 <1 1
El El(7440-38-2) Mass lb/Day <0.0426 1
1.3 Beryllium,total Concentration ug/L <1 1 <1 1
0 El(7440-41-7) Mass lb/Day <0.0426 1
1.4 Cadmium,total Concentration ug/L 1.05 1 <0.1 1
El ElEl
(7440-43-9) Mass lb/Day 0.0447 1
1.5 Chromium,total Concentration ug/L <1 1 <1 1
(7440-47-3) Mass lb/Day <0.0426 1
1.6 Copper,total ElConcentration ug/L <0.005 1 1.04 1
(7440-50-8) Mass lb/Day <0.213 1
1.7 Lead,total Concentration ug/L <1 1 <1 1
(7439-92-1) Mass lb/Day <0.0426 1
1.8 Mercury,total 0 ❑ Concentration ng/L 0.860 1 1.03 1
(7439-97-6) Mass lb/Day 0.0000366 1
1.9 Nickel,total Concentration ug/L 38.8 1 <1 1
El 00
(7440-02-0) Mass lb/Day 1.65 1
1.10 Selenium,total a Concentration ug/L 5.58 1 <1 1
00
(7782-49-2) Mass lb/Day 0.237 1
1.11 Silver,total 0
Concentration ug/L <1 1 <1 1
(7440-22-4) Mass lb/Day <0.0426 1
EPA Form 3510-2C(Revised 3-19) Page 11

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
Long-
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum DailyMonthlyAverage Number Term Number
Present Absent
Dischargeof of
Discharge
DisDcharge Analyses Average Analyses
(required)
(if available) Value
1.12 Thallium,total 0Concentration ug/L 0.753 1 <0.2 1
(7440-28-0) Mass lb/Day 0.032 1
1.13 Zinc,total ❑ Concentration mg/L 0.204 1 <0.005 1
(7440-66-6) Mass lb/Day 8.68 1
1.14 Cyanide,total Concentration mg/L 0.019 1 <0.01 1
(57-12-5) Mass lb/Day 0.809 1
1.15 Phenols,total Concentration ug/L <1.6 1 <1.6 1
Mass lb/Day <0.0681 1
Section 2.Organic Toxic Pollutants(GC/MS Fraction-Volatile Compounds)
2.1 Acrolein 0Concentration ug/L <5.0 1 <1.0 1
(107-02-8) Mass lb/Day <0.213 1
2.2 Acrylonitrile Concentration ug/L <5.0 1 <1.0 1
(107-13-1) Mass lb/Day <0.213 1
2.3 Benzene 0Concentration ug/L <1.0 1 <1.0 1
(71-43-2) Mass lb/Day <0.0426 1
2.4 Bromoform Concentration ug/L <1.0 1 <1.0 1
(75-25-2) Mass lb/Day <0.0426 1
2.5 Carbon tetrachloride Concentration ug/L <1.0 1 <1.0 1
(56-23-5) Mass lb/Day <0.0426 1
2.6 Chlorobenzene Concentration ug/L <1.0 1 <1.0 1
(108-90-7) Mass lb/Day <0.0426 1
2.7 Chlorodibromomethane 0 ❑✓ Concentration ug/L <1.0 1 <1.0 1
(124-48-1) Mass lb/Day <0.0426 1
2.8 Chloroethane 0 Concentration ug/L <2.0 1 <2.0 1
(75-00-3) Mass lb/Day <0.0851 1
EPA Form 3510-2C(Revised 3-19) Page 12

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHErNOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (speci Maximum Maximum Long-
�) DailyMonthlyAverage Number Term Number
Present Absent
of of
Discharge Df aCailablge) De isDcharge Analyses AverageValue Analyses
(required)
(if available)
2.9 2-chloroethylvinyl ether Concentration ug/L <5.0 1 <5.0 1
0 ElEl
(110-75-8) Mass lb/Day <0.213 1
2.10 Chloroform(67-66-3) 0 CIConcentration ug/L <1.0 1 <1.0 1
Mass lb/Day <0.426 1
2.11 Dichlorobromomethane 0 0 Concentration ug/L <1.0 1 <1.0 1
(75-27-4) Mass lb/Day <0.426 1
2.12 1,1-dichloroethane 0 ❑ 0 Concentration ug/L <1.0 1 <1.0 1
(75-34-3) Mass lb/Day <0.426 1
2.13 1,2-dichloroethane 0 0 0 Concentration ug/L <1.0 1 <1.0 1
(107-06-2) Mass lb/Day <0.426 1
2.14 1,1-dichloroethylene 0 0 0 Concentration ug/L <1.0 1 <1.0 1
(75-35-4) Mass lb/Day <0.426 1
2.15 12-dichloropropane 0 0 0 Concentration ug/L <1.0 1 <1.0 1
(78-87-5) Mass lb/Day <0.426 1
2.16 13-dichloropropylene 0 0 0 Concentration ug/L <1.0 1 <1.0 1
(542-75-6) Mass lb/Day <0.426 1
Ethylbenzene 0 CI Concentration ug/L <1.0 1 <1.0 1
2.17 (100-41-4) Mass lb/Day <0.426 1
2.18 Methyl bromide 0 0 Concentration ug/L <2.0 1 <24.4 1
(74-83-9) Mass lb/Day <0.0851 1
2.19 Methyl chloride 0 0 ✓❑ Concentration ug/L <2.0 1 <24.4 1
(74-87-3) Mass lb/Day <0.0851 1
2.20 Methylene chloride 0 0 0 Concentration ug/L <1.0 1 <1.0 1
(75-09-2) Mass lb/Day <0.426 1
2.21 1,1,2,2-tetrachloroethane 0 CI
ug/L <1.0 1 <1.0 1
(79-34-5) Mass lb/Day <0.426 1
EPA Form 3510-2C(Revised 3-19) Page 13

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Long-
MonthlyAverage Number Number
Present Absent Daily Term
Discharge Discharge Daily of Average of
(required) (if available) Discharge Analyses Value Analyses
(if available)
2.22 Tetrachloroethylene El
Concentration ug/L <1.0 1 <1.0 1
(127-18-4) Mass lb/Day <0.426 1
2.23 Toluene ✓0 Concentration ug/L <1.0 1 <1.0 1
0
(108-88-3) Mass lb/Day <0.426 1
2.24 1,2-trans-dichloroethylene ✓0 Concentration ug/L <1.0 1 <1.0 1
0
(156-60-5) Mass lb/Day <0.426 1
2.25 1,1,1-trichloroethane 0✓ Concentration ug/L <1.0 1 <1.0 1
0
(71-55-6) Mass lb/Day <0.426 1
2.26 1,1,2-trichloroethane ✓❑ Concentration ug/L <1.0 1 <1.0 1
(79-00-5) Mass lb/Day <0.426 1
2.27 Trichloroethylene Concentration ug/L <1.0 1 <1.0 1
(79-01-6) Mass lb/Day <0.426 1
2.28 Vinyl chloride ❑ Concentration ug/L <1.0 1 <1.0 1
(75-01-4) Mass lb/Day <0.426 1
Section 3.Organic Toxic Pollutants(GC/MS Fraction-Acid Compounds)
3.1 2-chlorophenol i0 Concentration ug/L <1.6 1 <1.6 1
(95-57-8) Mass lb/Day <0.0681 1
3.2 2,4-dichlorophenol 0 Concentration ug/L <1.6 1 <1.6 1
0
(120-83-2) Mass lb/Day <0.0681 1
3.3 2,4-dimethylphenol Concentration ug/L <1.6 1 <1.6 1
0 00
(105-67-9) Mass lb/Day <0.0681 1
3.4 4,6-dinitro-o-cresol 0 Concentration ug/L <8.0 1 <8.0 1
0
(534-52-1) Mass Ib/Day <0.34 1
3.5 2,4-dinitrophenol gi Concentration ug/L <8.0 1 <8.0 1
El
(51-28-5) Mass lb/Day <0.34 1
•
EPA Form 3510-2C(Revised 3-19) Page 14

•
EPA Identification Number NPDES Permit Number Facility Name Duffel!Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed Maximum Maximum Long-
(and DailyMonthly
Average Number g Number
Present Absent �) Y Term
Discharge Discharge Di Daily g har a Analyses f Average of
(required) (if available) Analyses
Value
(if available)
3.6 2-nitrophenol 0 Concentration ug/L <3.2 1 <3.2 1
(88-75-5) Mass lb/Day <0.136 1
3.7 4-nitrophenol Concentration ug/L <8.0 1 <8.0 1
El 1=1(100-02-7) Mass Ib/Day <0.34 1
3.8 p-chloro-m-cresol Concentration ug/L <1.6 1 <1.6 1
(59-50-7) El 0 0 Mass
lb/Day <0.0681 1
3.9 Pentachlorophenol Concentration ug/L <8.0 1 <8.0 1
(87-86-5) Mass lb/Day <0.34 <0.34 1
3.10 Phenol Concentration ug/L <0.0050 1 <0.005 1
0 0 0
(108-95-2) Mass lb/Day <0.213 1
3.11 2,4,6-trichlorophenol Concentration ug/L <1.6 1 <1.6 1
El El(88-05-2) Mass lb/Day <0.0681 1
Section 4.Organic Toxic Pollutants(GC/MS Fraction-Base/Neutral Compounds)
-
4.1 Acenaphthene Concentration ug/L <1.6 1 <1.6 1
0 0(83-32-9) Mass lb/Day <0.0681 1
4.2 Acenaphthylene 0 Concentration ug/L <1.6 1 <1.6 1
0
(208-96-8) Mass lb/Day <0.0681 1
4.3 Anthracene Concentration ug/L <1.6 1 <1.6 1
0 0 0
(120-12-7) Mass lb/Day <0.0681 1
4.4 Benzidine Concentration ug/L <8.0 1 <8.0 1
(92 87 5) El 0
Mass lb/Day <0.34 1
4.5 Benzo(a)anthracene 0 Concentration ug/L <1.6 1 <1.6 1
00
(56-55-3) Mass lb/Day <0.0681 1
4.6 Benzo(a)pyrene 0 Concentration ug/L <1.6 1 <1.6 1
00
(50-32-8) Mass lb/Day <0.0681 1
EPA Form 3510-2C(Revised 3-19)
Page 15

EPA Identification Number NPDES Permit Number Facility Name Ouffall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence
(check one) ' Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term _
(and CAS Number,if available) Required Believed Believed Maximum Maximum Lon
(specify) DailyMonthlyAverage Number Long-
(and
Present Absent Term
Discharge Discharge Daily of Average of
(required) (if available) Discharge Analyses Value Analyses
(if available)
4.7 3,4-benzofluoranthene Concentration ug/L <1.6 1 <1.6 1
0 0(205-99-2) Mass lb/Day <0.0681 1
4.8 Benzo(ghi)perylene Concentration ug/L <1.6 1 <1.6 1
(191-24-2) Mass lb/Day <0.0681 1
4.9 Benzo(k)fluoranthene Concentration ug/L <1.6 1 <1.6 1
(207-08-9) Mass lb/Day <0.0681 1
4.10 Bis(2-chloroethoxy)methane Concentration ug/L <1.6 1 <1.6 1
0 El(111-91-1) Mass lb/Day <0.0681 1
4.11 Bis(2-chloroethyl)ether Concentration ug/L <1.6 1 <1.6 1
(111-44-4) Mass lb/Day <0.0681 1
4.12 Bis(2-chloroisopropyl)ether 0 Concentration
(102-80-1) Mass
4.13 Bis(2-ethylhexyl)phthalate Concentration ug/L <8.0 1 <8.0 1
(117-81-7) Mass lb/Day <0.34 1
4.14 4-bromophenyl phenyl ether Concentration ug/L <1.6 1 <1.6 1
(101-55-3) Mass lb/Day <0.0681 1
4.15 Butyl benzyl phthalate 0✓ Concentration ug/L <1.6 1 <1.6 1
El
(85-68-7) Mass lb/Day <0.0681 1
4.16 2-chloronaphthalene Concentration ug/L <1.6 1 <1.6 1
(91-58-7) Mass lb/Day <0.0681 1
4.17 4-chlorophenyl phenyl ether Concentration ug/L <1.6 1 <1.6 1
0 0(7005-72-3) Mass lb/Day <0.0681 1
4.18 Chrysene Concentration ug/L <1.6 1 <1.6 1
0 0(218-01-9) Mass lb/Day <0.0681 1
4.19 Dibenzo(a,h)anthracene Concentration ug/L <1.6 1 <1.6 1
0 0(53-70-3) Mass lb/Day <0.0681 1
EPA Form 3510-2C(Revised 3-19)
Page 16

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Average Number Long- Number
Present Absent Daily Monthly Dailyof Term
Discharge Discharge Average of
(required) (if available) Discharge Analyses Value Analyses
(if available)
4.20 1,2-dichlorobenzene Concentration ug/L <1.6 1 <1.0 1
0 El(95-50-1) Mass lb/Day <0.0681 1
4.21 13-dichlorobenzene El Concentration ug/L <1.6 1 <1.0 1
(541-73-1) Mass lb/Day <0.0681 1
4.22 1,4-dichlorobenzene Concentration ug/L <1.6 1 <1.0 1
El ElEl
(106-46-7) Mass lb/Day <0.0681 1
4.23 3,3-dichlorobenzidine Concentration ug/L <8.0 1 <8.0 1
(91-94-1) Mass lb/Day <0.34 1
4.24 Diethyl phthalate a Concentration ug/L <1.6 1 <1.6 1
0
(84-66-2) Mass lb/Day <0.0681 1
4.25 Dimethyl phthalate Concentration ug/L <1.6 1 <1.6 1
El El(131-11-3) Mass lb/Day <0.0681 1
4.26 Di-n-butyl phthalate © Concentration ug/L <1.6 1 <1.6 1
(84-74-2) Mass lb/Day <0.0681 1
4.27 2,4-dinitrotoluene Concentration ug/L <1.6 1 <1.6 1
(121-14-2) Mass lb/Day <0.0681 1
4.28 2,6-dinitrotoluene Concentration ug/L <1.6 1 <1.6 1
IZI
(606-20-2) Mass lb/Day <0.0681 1
4.29 Di-n-octyl phthalate Concentration ug/L <1.6 1 <1.6 1
0 ElEl
(117-84-0) Mass Day <0.0681 1
4.30 1,2-Diphenylhydrazine 0 Concentration
(as azobenzene)(122-66-7) Mass
4.31 Fluoranthene 0Concentration ug/L <1.6 1 <1.6 1
0 0
(206-44-0) Mass lb/Day <0.0681 1
-
4.32 Fluorene ✓� Concentration ug/L <1.6 1 <1.6 1
00
•
(86 73 7) -
Mass lb/Day <0.0681 1
EPA Form 3510-2C(Revised 3-19) Page 17

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Long-
(and DailyMonthlyAverage Number Term Number
Present Absent
Dischargeof of
Discharge DisDcharge Analyses Average Analyses
(required)
(if available) V81ue
4.33 Hexachlorobenzene 0Concentration ug/L <1.6 1 <1.6 1
0 0
(118-74-1) Mass Ib/Day <0.0681 1
4.34 Hexachlorobutadiene 0Concentration ug/L <1.6 1 <1.6 1
El 0
(87-68-3) Mass lb/Day <0.0681 1
4.35 Hexachlorocyclopentadiene 0 0Concentration ug/L <8.0 1 1
(77-47-4) Mass lb/Day <0.34 1
4.36 Hexachloroethane 0Concentration ug/L <1.6 1 <1.6 1
(67-72-1) Mass Ib/Day <0.0681 1
4.37 Indeno(1,2,3-cd)pyrene 0Concentration ug/L <1.6 1 <1.6 1
(193-39-5) Mass lb/Day <0.0681 1
4.38 Isophorone 0Concentration ug/L <1.6 1 <1.6 1
1=1 El
(78-59-1) Mass lb/Day <0.0681 1
4.39 Naphthalene 0Concentration ug/L <1.6 1 <1.6 1
El El
(91-20-3) Mass lb/Day <0.0681 1
4.40 Nitrobenzene Concentration ug/L <1.6 1 <1.6 1
(98-95-3) Mass lb/Day <0.0681 1
4.41 N-nitrosodimethylamine ✓� Concentration ug/L <1.6 1 <1.6 1
(62-75-9) Mass lb/Day <0.0681 1
4.42 N-nitrosodi-n-propylamine 0 Concentration ug/L <1.6 1 <1.6 1
0 0
(621-64-7) Mass lb/Day <0.0681 1
4.43 N-nitrosodiphenylamine 0Concentration ug/L <1.6 1 <1.6 1
0 0
(86-30-6) Mass lb/Day <0.0681 1
4.44 Phenanthrene 0Concentration ug/L <1.6 1 <1.6 1
0 0
(85-01-8) Mass Ib/Day <0.0681 1
4.45 Pyrene Concentration ug/L <1.6 1 <1.6 1
I:I ElEl
(129-00-0) Mass lb/Day <0.0681 1
EPA Form 3510-2C(Revised 3-19) Page 18

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Long-
(and DailyMonthlyAverage Number Term Number
Present Absent
Discharge Discharge Daily of Average of
(required) (if available) Discharge Analyses Value Analyses
(if available)
4.46 1,2,4-trichlorobenzene Concentration ug/L <1.6 1 <1.6 1
El El El
(120-82-1) Mass lb/Day <0.0681 1
Section 5.Organic Toxic Pollutants(GC/MS Fraction—Pesticides)
5.1 Aldrin Concentration
El 0(309-00-2) Mass
5.2 a-BHC Concentration
El El(319-84-6) Mass
5.3 I3-BHC Concentration
(319-85-7) Mass
5.4 y-BHC Concentration
(58-89-9) Mass
5.5 b-BHC Concentration
(319-86-8) Mass
5.6 Chlordane Concentration
0
(57-74-9) Mass
5.7 4,4'-DDT Concentration
(50-29-3) Mass
4 4'-DDE � Concentration
5.8 (72-55-9) Mass
5.9 4,4'-DDD Concentration
0
(72-54-8) Mass
5.10 Dieldrin Concentration
0 0(60-57-1) Mass
5.11 a-endosulfan 0 Concentration
0(115-29-7) 0 Mass
EPA Form 3510-2C(Revised 3-19) Page 19

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed Maximum Maximum Long-
(and (specify) DailyMonthlyAverage Number Number
Present Absent Dailyof Term of
Discharge Discharge Average
(required) (if available) D(ifischaravailable)ge Analyses Value Analyses
5.12 Q-endosulfan 0
0
❑ Concentration
(115-29-7) Mass
5.13 Endosulfan sulfate ❑ 0 ❑ Concentration
(1031-07-8) Mass
5.14 Endrin 0
0
❑ Concentration
(72-20-8) Mass
5.15 Endrin aldehyde ❑ ❑ ❑ Concentration
(7421-93-4) �'
Mass
5.16 Heptachlor ❑ 0
❑ Concentration
(76-44-8) Mass
Heptachlor epoxide Concentration
5.17 (1024-57-3) ❑ ❑ 0
Mass
PCB-1242 Concentration
5.18 (53469-21-9) 0 ❑ ✓❑
Mass
PCB-1254 Concentration
5.19 (11097-69-1) ❑ 0 ❑✓
Mass
PCB-1221 Concentration
5.20 (11104-28-2) 0 ❑ 0
Mass
PCB-1232 Concentration
5.21 (11141-16-5) 0 0 0
Mass
PCB-1248 Concentration
5.22 (12672-29-6) 0 0 0
Mass
PCB-1260 Concentration
5.23 (11096-82-5) ❑ ❑ ❑✓
Mass
PCB-1016 Concentration
5.24 (12674-11-2) 0 0 ✓❑
Mass
EPA Form 3510-2C(Revised 3-19) Page 20

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))l
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed Maximum Maximum Long-
q (specify) DailyMonthlyAverage Number Term Number
Present Absent
Discharge Discharge Daily of Average of
(required) (if available) Discharge Analyses Value Analyses
(if available)
Toxaphene Concentration
5.25 (8001-35-2) ❑ ❑ ✓❑
Mass
1 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 3510-2C(Revised 3-19) Page 21

This page intentionally left blank.

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE C.CERTAIN CONVENTIONAL AND NON CONVENTIONAL POLLUTANTS(40 CFR 122.21(g)(7)(vi))1
Presence or Absence
(check one) Effluent Intake
(Optional)
Pollutant Units Maximum Long-Term
Believed Believed (specify) Maximum Daily Long-Term
Monthly Average Daily Number of Average Number of
Present Absent Discharge
(required) Discharge Discharge Analyses Value Analyses
(if available) (if available)
❑ Check here if you believe all pollutants on Table C to be present in your discharge from the noted outfall.You need not complete the"Presence or Absence"column of Table C for
each pollutant.
❑ Check here if you believe all pollutants on Table C to be absent in your discharge from the noted outfall.You need not complete the"Presence or Absence"column of Table C for
each pollutant.
1 Bromide ❑✓ ❑ Concentration mg/L 3.3 1 0.11 1
(24959-67-9) Mass lb/Day 140 1
Chlorine,total 0 ❑ Concentration mg/L <0.050 1 <0.050 1
2. residual Mass lb/Day <2.13 1
3. Color ❑ Concentration mg/L 5.0 1 15 1
Mass lb/Day NA 1
4. Fecal coliform 0 0 Concentration MPN/loo 1 1 12 1
Mass lb/Day NA 1
5 Fluoride 0 0 Concentration mg/L 0.77 1 <0.1 1
(16984-48-8) Mass lb/Day 32.8 1
6 Nitrate nitrite ❑ Concentration mg-N/L 0.59 1 0.45 1
Mass lb/Day 25.1 1
7 Nitrogen,total ❑ El
mg/L 15 1 0.22 1
organic(as N) Mass lb/Day 638 1
8. Oil and grease El 0Concentration mg/L <5 1 <5 1
Mass lb/Day <213 1
9 Phosphorus(as ❑ ❑ Concentration mg/L 0.031 1 0.056 1
P),total(7723-14-0) Mass lb/Day 1.32 1
10. Sulfate(as SO4) 0 ❑ Concentration mg/L 280 1 4.7 1
(14808-79-8) Mass lb/Day 11900 1
11. Sulfide(as S) ❑ Concentration mg/L <1.0 1 <1.0 1
Mass lb/Day <42.8 1
EPA Form 3510-2C(Revised 3-19) Page 23

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE C.CERTAIN CONVENTIONAL AND NON CONVENTIONAL POLLUTANTS(40 CFR 122.21(g)(7)(vi))1
Presence or Absence
(check one) Effluent Intake
(Optional)
Pollutant Units Maximum Long-Term
Believed Believed (specify) Maximum Daily Long-Term
Present Absent Discharge Monthly Average Daily Number of Average Number of
(required) Discharge Discharge Analyses Value Analyses
(if available) (if available)
12. Sulfite(as SO3) ✓❑ ❑ Concentration mg/L <2.0 1 <2.0 1
(14265-45-3) Mass lb/Day <85.1 1
13. Surfactants ❑✓ ❑ Concentration mg/L <0.050 1 0.076 1
Mass lb/Day <2.13 1
14. Aluminum,total ❑ ❑ Concentration mg/L 0.127 1 0.764 1
(7429-90-5) Mass lb/Day 5.41 1
15. Barium,total ❑ ❑ Concentration mg/L 0.049 1 0.017 1
(7440-39-3) Mass lb/Day 2.09 1
16. Boron,total ❑✓ ❑ Concentration mg/L 7.92 1 0.157 1
(7440-42-8) Mass lb/Day 337 1
Cobalt,total ❑ ❑ Concentration ug/L 55.8 1 <1 1
17. (7440 a8 a)
Mass lb/Day 2.37 1
18. Iron,total ❑✓ ❑ Concentration mg/L 0.199 1 0.686 1
(7439-89-6) Mass lb/Day 8.47 1
19 Magnesium,total ❑✓ ❑ Concentration mg/L 67.7 1 2.64 1
(7439-95-4) Mass lb/Day 2880 1
Molybdenum, Concentration mg/L 8.84 1 <1 1
20. total ❑ ❑✓
(7439-98-7) Mass lb/Day 0.376 1
21. Manganese,total ❑✓ ❑ Concentration mg/L 4.86 1 0.052 1
(7439-96-5) Mass • lb/Day 207 1
22 Tin,total ❑ ❑✓ Concentration mg/L <0.01 1 <0.01 1
(7440-31-5) Mass lb/Day <0.426 1
23. Titanium,total ❑ ❑✓ Concentration mg/L <0.005 1 0.02 1
(7440-32-6) Mass lb/Day <0.213 1
EPA Form 3510-2C(Revised 3-19) Page 24

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE C.CERTAIN CONVENTIONAL AND NON CONVENTIONAL POLLUTANTS(40 CFR 122.21(g)(7)(vi))l
Presence or Absence
(check one) Effluent Intake
(Optional)
Pollutant Units Maximum Long-Term
Believed Believed (specify) Maximum Daily Long-Term
Monthly Average Daily Number of Average Number of
Present Absent Discharge
(required) Discharge Discharge Analyses Analyses
(if available) (if available) Value
24. Radioactivity
Alpha,total ❑ 0
Concentration
Mass
Beta,total ❑ Concentration
Mass
Radium,total ❑ 0
Concentration
Mass
Radium 226,total ❑ 0Concentration
Mass
1 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 3510-2C(Revised
3-19)
Page 25

This page intentionally left blank.

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE D.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(g)(7)(vii))l
Presence or Absence
Pollutant (check one) Available Quantitative Data
Believed Believed Reason Pollutant Believed Present in Discharge
(specify units)
Present Absent _
1. Asbestos El 0
2. Acetaldehyde ❑ 0
3. Allyl alcohol ❑ 0
4. Allyl chloride 0 0
5. Amyl acetate 0 0
6. Aniline 0 0
7. Benzonitrile 0 0
8. Benzyl chloride 0 0
•9. Butyl acetate 0 0
10. Butylamine ❑ 0
11. Captan El 0
12. Carbaryl ❑ 0
13. Carbofuran ❑ 0
14. Carbon disulfide ❑ 0
15. Chlorpyrifos CI ❑✓
16. Coumaphos 0 0
17. Cresol CI 0
18. Crotonaldehyde 0 0
19. Cyclohexane 0 0
EPA Form 3510-2C(Revised 3-19)
Page 27

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE D.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 12221(g)(7)(vii))1
Presence or Absence
Pollutant (check one) Available Quantitative Data
Believed Believed Reason Pollutant Believed Present in Discharge
(specify units)
Present Absent
20. 2,4-D(2,4-dichlorophenoxyacetic acid) ❑ ❑✓
21. Diazinon ❑ ❑✓
22. Dicamba 0 0
23. Dichlobenil 0 0
24. Dichlone ❑ 0
25. 2,2-dichloropropionic acid 0 0
26. Dichlorvos ❑ ❑✓
27. Diethyl amine ❑ 0
28. Dimethyl amine 0 0
29. Dintrobenzene 0 ❑✓
•
30. Diquat ❑ 0
31. Disulfoton ❑ ❑✓
32. Diuron ❑ ✓❑
33. Epichlorohydrin ❑ 0
34. Ethion ❑ 0
35. Ethylene diamine ❑ 0
36. Ethylene dibromide ❑ 0
37. Formaldehyde ❑✓ ❑ In very low concentrations if present at all. No data
38. Furfural ❑ 0
EPA Form 3510-2C(Revised 3-19) Page 28
L

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE D.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(g)(7)(vii))l
Presence or Absence
Pollutant (check one) Available Quantitative Data
Believed Believed Reason Pollutant Believed Present in Discharge (specify units)
Present Absent
39. Guthion ❑ ❑✓
40. Isoprene ❑ ❑✓
41. Isopropanolamine 0 p
42. Kelthane 0 ❑✓
43. Kepone 0 ✓❑
44. Malathion 0 ✓❑
45. Mercaptodimethur 0 ❑✓
46. Methoxychlor 0 ✓❑
47. Methyl mercaptan 0 p
48. Methyl methacrylate 0 ❑✓
49. Methyl parathion 0 p
1 50. Mevinphos 0 ❑✓
1
51. Mexacarbate 0 - ✓❑
I 52. Monoethyl amine 0 ❑✓
53. Monomethyl amine 0 ❑✓
54. Naled 0 p
55. Naphthenic acid 0 ❑✓
56. Nitrotoluene 0 p
57. Parathion 0 ✓❑
EPA Form 3510-2C(Revised 3-19) Page 29

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE D.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(g)(7)(vii))1
Presence or Absence
Pollutant (check one) Available Quantitative Data
Believed Believed Reason Pollutant Believed Present in Discharge
(specify units)
Present Absent
58. Phenolsulfonate ❑ ❑✓
59. Phosgene ❑ . ❑✓
60. Propargite ❑ ✓❑
61. Propylene oxide ❑ p
62. Pyrethrins ❑ ❑✓
63. Quinoline ❑ ❑✓
64. Resorcinol ❑ ✓❑
65. Strontium ❑
66. Strychnine ❑ ❑✓
67. Styrene ❑ ❑✓
2,4,5-T(2,4,5-trichlorophenoxyacetic ❑ ❑
68. acid)
69. TDE(tetrachlorodiphenyl ethane) ❑ ❑✓
70 2,4,5-TP[2-(2,4,5-trichlorophenoxy) ❑
propanoic acid]
71. Trichlorofon ❑ ❑✓
72. Triethanolamine ❑ ✓❑
73. Triethylamine ❑ ❑✓
74. Trimethylamine ❑ ❑✓
75. Uranium 0 ✓❑
76. Vanadium ❑ ❑✓
EPA Form 3510-2C(Revised 3-19) Page 30

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE D.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(g)(7)(vii))l
Presence or Absence
Pollutant (check one) Available Quantitative Data
Believed Believed Reason Pollutant Believed Present in Discharge
(specify units)
Present Absent
77. Vinyl acetate ❑ ❑✓
78. Xylene ✓❑ ❑ At very low concentrations. If present at all. No data
79. Xylenol ❑ ✓❑
80. Zirconium ❑ ,
1 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 3510-2C(Revised 3-19) Page 31

This page intentionally left blank.
IL

EPA Identification Number NPDES Permit Number Facility Name Duffel!Number Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station 005 OMB No.2040-0004
TABLE E.2,3,7,8 TETRACHLORODIBENZO P DIOXIN(2,3,7,8 TCDD)(40 CFR 122.21(g)(7)(viii))
TCDD Presence or
Congeners Absence
Pollutant Used or (check one) Results of Screening Procedure
Manufactured Believed Believed
Present Absent
2,3,7,8-TCDD El El ✓❑
•
EPA Form 3510-2C(Revised 3-19)
Page 33

Marshall Steam Station Water Schematic
NPDES Permit #NC0004987
ID Fan Control House
--> Non-contact Cooling Catawba County
Water
Outfall 003 Lake
Intake Screen ---> Norman
Backwash 0.02 MGD
V >I Once-through Cooling Water Outfall 001 Lake
I 805.7 MGD Norman
Domestic Wastewater JI Sanitary > POTW
Ash Sluice l >1 Submerged Flight Conveyor
Evap.1.7 MGD
Lake
Norman Wastewater
Flue Gas Desulfurization(FGD) Ash Basin Outfall 002 Lake
Wet Scrubber Wastewater Recovery Wells Treatment Norman
FGD Wastewater Treatment System Internal Outfall 006
I, System 2.2 MGD
> ^
(Phys/Chem&Bio)
0.8 MGD
>1 Heat Exchanger Cooling Water 1--- 1.15 MGD > Storm Water
Air Preheater Water, Precipitator&Boiler Wash Waters,
Misc.Cleaning Wastewaters
Emergency
Fly Ash Silo Sump I overflow
Ash Basin Outfall 007 Lake
I > Norman
) 71 Misc. Equipment Cooling I— 0.53 MGD 0.04
MGD
'> Raw Water Stormwater �I�
Treatment V V W v
Boiler and Turbine Yard Drain Sumps Outfalls 002A and 002B Lake
Room Sumps MGD —� (2 flows to 1A) Yard Sump Overflows Norman
` I (no flow expected)
Coal Pile - Alternate - 2.43
Route MGD
V v V V
Internal
Stormwater > Holding Basin — Outfall
010 > Retention Basin Outfall 005 Lake
0.5 MGD 5.1 MGD Norman
V A
Landfill Leachate 0.04 MGD

,
EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station OMB No.2040-0004
U.S.Environmental Protection Agency
FORM �_ Application for NPDES Permit to Discharge Wastewater
2E NPDES ��EPA MANUFACTURING,COMMERCIAL,MINING,AND SILVICULTURAL FACILITIES WHICH
DISCHARGE ONLY NONPROCESS WASTEWATER
SECTION 1.OUTFALL LOCATION(40 CFR 122.21(h)(1))
1.1 Provide information on each of the facility's outfalls in the table below.
Outfall
0 Number Receiving Water Name Latitude Longitude
w
0
0 003 Lake Norman 35° 35' 50.4„ N 80° 57' 48.1° W
R
0
0
SECTION 2.DISCHARGE DATE(40 CFR 122.21(h)(2))
Es? 2.1 Are you a new or existing discharger?(Check only one response.)
w w ❑ New discharger ❑✓ Existing discharger 4 SKIP to Section 3.
H c 2.2 Specify your anticipated discharge date:
0
SECTION 3.WASTE TYPES(40 CFR 122.21(h)(3))
3.1 What types of wastes are currently being discharged if you are an existing discharger or will be discharged if you are a
new discharger?(Check all that apply.)
❑ Sanitary wastes ❑ Other nonprocess wastewater(describe/explain
ElRestaurant or cafeteria waste directly below)
n 0Non-contact cooling water
a
3.2 Does the facility use cooling water additives?
a ❑ Yes ❑✓ No 4 SKIP to Section 4.
3.3 List the cooling water additives used and describe their composition.
Cooling Water Additives Composition of Additives
(list) (if available to you)
SECTIO 14.EFFLUENT CHARACTERISTICS(40 CFR 122.21(h)(4))
4.1 Have you completed monitoring for all parameters in the table below at each of your outfalls and attached the results to
this application package?
0 Yes 0 No;a waiver has been requested from my NPDES permitting authority
(attach waiver request and additional information)4 SKIP to Section 5.
4.2 Provide data as requested in the table below. (See instructions for specifics.)
u) Number of Maximum Daily Average Daily Source
w Parameter or Pollutant Analyses Discharge Discharge (use codes
y• (if actual data (specify units) (specify units) per
11 R reported) Mass Conc. Mass Conc. instructions)
co Biochemical oxygen demand(BOD5) 1 0.33 <2 mg/L 0.33 <2 mg/L 1
0 Total suspended solids(TSS) 1 3.84 23 mg/L 3.84 23 mg/L 1
c
c Oil and grease 1 0.83 <5 mg/L 0.83 <5 mg/L 1
E
W Ammonia(as N) 1 0.008 0.02 mg/L 0.008 0.02 mg, 1
Discharge flow Est. 0.02 MGD 2
pH(report as range) 1 6.7 SU I.
Temperature(winter) 1 10.o c 1
Temperature(summer)
I Sampling shall be conducted according to sufficiently sensitive test procedures(i.e.,methods)approved under 40 CFR 136 for the analysis of pollutants orpollutant
parameters or required under 40 CFR chapter I,subchapter N or 0.See instructions and 40 CFR 122.21(e)(3).
EPA Form 3510-2E(revised 3-19) Page 1

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station OMB No.2040-0004
4.3 Is fecal coliform believed present,or is sanitary waste discharged(or will it be discharged)?
❑✓ Yes ❑ No 4 SKIP to Item 4.5.
4.4 Provide data as requested in the table below)(See instructions for specifics.)
Number of Maximum Daily Average Daily Source
Parameter or Pollutant Analyses Discharge Discharge (Use codes
(if actual data (specif, units) (specify units) per
reported) Mass Conc. Mass Conc. Instructions.)
Fecal coliform 1 6.3 MPN/100 ML 6.3 MPN/1)0 ML 1
d
E.coil
w
Enterococci
0 4.5 Is chlorine used(or will it be used)?
u) 0 Yes ❑✓ No 4 SKIP to Item 4.7.
N 4.6 Provide data as requested in the table below) (See instructions for specifics.)
4) Number of Maximum Daily Average Daily Source
sParameter or Pollutant Analyses Discharge Discharge (use codes
V (if actual data (specify units) (speci units) per
.. reported) Mass Conc. Mass Conc. instructions)
O Total Residual Chlorine
w 4.7 Is non-contact cooling water discharged(or will it be discharged)?
❑✓ Yes 0 No 4 SKIP to Section 5.
4.8 Provide data as requested in the table below) (See instructions for specifics.)
Number of Maximum Daily Average Daily Source
Parameter or Pollutant Analyses Discharge Discharge (use codes
(if actual data (speci units) (speci units) per
reported) Mass Conc. Mass Conc. instructions)
Chemical oxygen demand(COD) 1 3.34 <20 mg/L 3.34 <20 mg/ 1
Total organic carbon(TOC) 1 0.25 1.5 mg/L 0.25 1.5 mg/ 1
SECTION 5.FLOW(40 CFR 122.21(h)(5))
5.1 Except for stormwater water runoff,leaks,or spills,are any of the discharges you described in Sections 1 and 3 of this
application intermittent or seasonal?
❑ Yes 4 Complete this section. ❑✓ No 4 SKIP to Section 6.
c 5.2 Briefly describe the frequency and duration of flow. .
L
SECTION 6.TREATMENT SYSTEM(40 CFR 122.21(h)(6))
6.1 Briefly describe any treatment system(s)used(or to be used).
aro o No treatment since it is just river water beingpumpedthroughhandling air unit and back to Lake Norman.
co
c
m
E
m
m
H
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 3510-2E(revised 3-19) Page 2
i

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110000351397 NC0004987 Marshall Steam Station OMB No.2040-0004
SECTION 7.OTHER INFORMATION(40 CFR 122.21(h)(7))
7.1 Use the space below to expand upon any of the above items.Use this space to provide any information you believe the
reviewer should consider in establishing permit limitations.Attach additional sheets as needed.
0
E
L
0
=
0
SECTION 8.CHECKLIST AND CERTIFICATION STATEMENT(40 CFR 122.22(a)and(d))
8.1 In Column 1 below,mark the sections of Form 2E 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 provide attachments.
Column 1 Column 2
❑✓ Section 1:Outfall Location ✓❑ wl attachments
c ents(e.g.,responses for additional outfalls)
❑✓ Section 2:Discharge Date ❑ w/attachments
❑✓ Section 3:Waste Types ❑ wl attachments
• ❑✓ Section 4:Effluent Characteristics ❑ w/attachments
❑✓ Section 5:Flow ❑ w/attachments
❑✓ Section 6:Treatment System ❑ w/attachments
•R
❑✓ Section 7:Other Information ❑ w/attachments
CD
❑✓ Section 8:Checklist and Certification Statement ❑ wl attachments
y 8.2 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
Rick Roper General Manager III-Regulated Stations
Signature Date signed
Qtjt, "lb•/ 3/ V/20z-1
EPA Form 3510-2E(revised 3-19) Page 3

NPDES
Supplemental Information
For
Marshall Steam Station
NPDES Permit No. NC0004987
March 2021

Marshall Steam Station
• Supplemental Information for
NPDES Permit Renewal Application
March 2021
1.0 General Information
Marshall Steam Station (MSS) is located on NC Highway 150, six miles west of 1-77 in
Catawba County on Lake Norman near Terrell, North Carolina. MSS consists of four
coal-fired steam electric generating units. Units 1 and 2 can generate 380,000 kilowatts
(net) of electricity each and units 3 and 4 have the capacity to generate 660,000 kilowatts
(net) of electricity each. In recent years Marshall has also added the capability to operate
partially off natural gas.
2.0 Outfall Information
At Marshall Steam Station there are 7 outfalls that discharge directly to Lake Norman.
They are outfalls 001, 002, 002A, 002B, 003, 005 and 007. Outfalls 002A and 002B only
discharge if there is an overflow situation from a yard sump. It is very unlikely that these
two outfalls will have an overflow. Outfall 007 is an emergency overflow. It should
never discharge in the future since the ash basin water level has been significantly
lowered by the process of dewatering. A discussion of the individual waste streams
follows.
2.1 Outfall 001 - Condenser Cooling Water (CCW) Units 1-4
The CCW system is a once through non-contact cooling water system, which condenses
steam from the condensers and other selected heat exchangers. When MSS is operating
at full power, it has a design capacity to pump 1463 MGD (1,016,000 GPM) of cooling
water through a network of tubes that runs through the condenser and selected heat
exchangers. The raw cooling water is returned to the lake. No biocides or other
chemicals are used in the condenser cooling water.
Units 1 and 2 have two CCW pumps per unit and Units 3 and 4 have three CCW pumps
per unit with the following maximum flow capacities:
Unit No. 1-Pump 2-Pump 3-Pump
GPM GPM GPM
1 126,000 190,000 -
2 126,000 190,000 -
3 150,000 253,000 318,000
4 150,000 253,000 318,000
The operational schedule for these pumps is dependent on the intake water temperature
and on the unit loads. Depending on the electrical demand, pumps are operated to
maximize MSS efficiency and to assure balanced and indigenous populations are
maintained in Lake Norman. Each unit is on an independent system to avoid a system
trip that would suddenly reduce the discharge flow at outfall 001. This practice leads to
a higher reliability factor for the units and protection of aquatic life taking refuge in the
Page 2 of 14

Marshall Steam Station
• Supplemental Information for
NPDES Permit Renewal Application
March 2021
discharge canal during cold weather. Flow recorded on the monthly Discharge Monitoring
Reports is based on CCW pump run times.
The condensers are mechanically cleaned. Normally, amertap balls are cleaning the
tubes on a continuous basis while the plant is operating. Periodically, after the condenser
is drained, metal scrapers, plastic scrapers or rubber plugs are forced through the tubes
to rid them of scale or other deposits. The condenser tubes may also be tested for leaks,
as needed. A leak test can be conducted in approximately two to three hours per unit
with usually no more than six injections of tracer gas (i.e., sulfur hexafluoride, helium,
etc.) each within approximately a 30 second period and/or checked with fluorescent dye.
The dye is added to the condensate water and put on the outside of the condenser tubes.
During the test, if fluorescent water does leak into the tubes, this discharge indicates a
leak does exist in the condenser tubing. The levels of gas or dye that might be discharged
would be well below any levels of aquatic biological toxicity concerns. If leaks are
detected, then one method used to temporarily stop small leaks is to add sawdust to the
CCW system, as previously approved by NCDENR. The sawdust is added at amounts
that will plug the leaks and not result in an environmental impact. This is a temporary
measure until the unit can come off-line so the leaks can be permanently repaired.
2.1.1 Intake Screen Washing Manually by Removing Screens
The intake screens (32 total) are washed on an as needed basis. Normally, the
screens require washing once a month for a period of approximately 5 minutes per
screen. The screens (10 ft x 20 ft) are stationary type and are removed for
cleaning. A low-pressure pump supplies the raw water required for washing with
a design capacity of 300 gpm. Therefore, the average flow of water used to
backwash the screens is 0.002 MGD. Should it become necessary to backwash
the screens on a continuous basis the maximum flow would be 0.43 MGD per
screen. The debris collected on the screens consists of twigs, leaves, and other
material indigenous to Lake Norman and is removed and properly disposed. The
intake screen backwash water drains back to the station intake cove without any
adverse environmental impact.
2.2 Outfall 002 - Ash Basin
The ash basin at MSS ceased to receive wastewater from the station in 2019. The
wastewater that is currently generated at the station ultimately enters into the lined
retention basin system and discharges after treatment via outfall 005. Outfall 002 is being
used for the discharge associated with ash basin closure and groundwater remediation
activities. These activities pump water to an on-site wastewater treatment system and
then discharge to Outfall 002. The maximum daily discharge value from Outfall 002 is
less than 3 MGD based on the WWTS capabilities and a previous permit modification.
Page 3 of 14

Marshall Steam Station
Supplemental Information for
NPDES Permit Renewal Application
March 2021
2.3 Outfalls 002A and 002B - Yard-Drain Sump Emergency Overflow
An overflow pipe that could direct flow from the sump to Lake Norman was included in
the construction of the two yard sumps. This modification was performed to prevent
submergence and damage of the pump motors within the sumps if all pumps failed, or
redundant power supply lines could not be restored in a timely manner. This discharge
has a very low potential to occur.
2.4 Outfall 003 - Unit 4 Fan Control House Cooling Water
Once through non-contact cooling water is supplied to the Unit 4 induced draft (ID) fan
motor control-house equipment to remove excess heat. No chemicals are added to the
once through raw lake water. The flow rate through the control equipment that
discharges to Lake Norman is approximately 0.02 MGD.
2.5 Internal Outfall 004 - FGD Constructed Wetland Treatment System
This treatment system has been retired. The NPDES permit was previously modified to
remove this internal outfall.
2.6 Outfall 005 - Lined Retention Basin
The lined retention basin (LRB) was constructed in order to be able to treat wastewater
that would previously go to the ash basin. By routing these wastewater streams to the
LRB the ash basin closure process was able to begin. This outfall began to discharge in
January 2019.
The LRB accommodates flows from two yard-drain sumps, low volume wastes, the FGD
wastewater treatment system (internal outfall 006), potentially the submerged flight
conveyor system, landfill leachate and non-point source storm water. Low volume waste
sources include but are not limited to wastewater from ion exchange water treatment
system, water treatment evaporator blowdown, laboratory and sampling streams, boiler
blowdown, floor drains, and recirculating house service water systems.
2.6.1 Yard-Drain Sumps
The yard-drain sumps are concrete structures having four level-controlled pumps
each that direct wastewater from the powerhouse area to the LRB. These pumps
are operated on a rotating basis. Usually two pumps are set so that one pump is
primary and the other is backup. After a selected period, the controls are changed
so that different pumps are utilized.
The yard-drain sumps collect wastewater from many sources, such as, the filtered
water system, turbine and boiler room sumps, miscellaneous equipment cooling
water, foundation drainage, low volume wastes, and tunnel unwatering. The yard-
drain sumps also collect some storm water runoff from the coal pile, rail access,
Page 4 of 14

Marshall Steam Station
Supplemental Information for
NPDES Permit Renewal Application
March 2021
and powerhouse roofs and pavement. Ground water from a foundation drainage
system under the track hopper is also intermittently discharged to the yard-drain
sumps.
2.6.2 Turbine Room Sumps
The wastewater to the turbine room sumps comes from non-contact cooling water
(from Units 1 & 2 boiler feed pump turbine lube oil coolers) and floor drains. Floor
drains contain boiler blowdown, leakage from seals, equipment cooling water,
condensate from the feedwater system, low volume wastewater, boiler room sump
overflow, emergency firefighting water, general mechanical maintenance activities,
miscellaneous plant wastes and area washdown water.
2.6.3 Boiler Room Sumps
The average flow pumped from the boiler room sumps directly to the LRB is
approximately 1.55 MGD. The sources of input to the boiler room sumps include
the following:
2.6.3.1 Water Treatment System
The MSS make-up water treatment system is comprised of pressure
filters, three gravity filters, two sets of activated carbon filters, a
reverse osmosis system and two sets of demineralizers. The water
treatment wastes consist of floc and sedimentation, filter backwash,
reverse osmosis concentrate reject and cleaning wastes, and
demineralizer regeneration wastes. Water processed through this
system is supplied to the boilers to generate steam to turn the
turbines. On occasion a vendor may be used with a mobile water
treatment unit to augment the facility water treatment capacity. Any
vendor will use traditional water treatment methods, chemicals, and
disposal methods generally described below. This wastewater is
drained to the boiler room sump, which ultimately discharges to the
ash basin.
Clarifier:
The clarifier utilizes typical water treatment chemicals such as, Ferric
sulfate, sodium hydroxide, and calcium hypochlorite for the primary
treatment of raw water. The sedimentation wastes collected in the
clarifier consists of solids that were suspended in the service water
plus Ferric precipitate formed as a result of adding Ferric sulfate and
sodium hydroxide. Since under normal conditions the clarifier is
bypassed, only very small quantiles of Ferric Sulfate or caustic will
be used each year for this system. When in operation, the average
volume of water required for desludging the clarifier is approximately
0.008 MGD. These sedimentation wastes along with dilute water
treatment chemicals and by-products are piped to a floor drain which
Page 5 of 14

Marshall Steam Station
• Supplemental Information for
NPDES Permit Renewal Application
March 2021
flows to the boiler room sumps where they are pumped to the ash
basin via the yard-drain sump.
Note: The Clarifier at Marshall is typically not needed and therefore
is bypassed under normal operating conditions due to the installation
of Pressure Filters.
Gravity Filters:
There are three gravity filters composed of anthracite (coal) which
follow the clarifier in the water treatment process. They are used for
removal of colloidal material and are backwashed as necessary,
dependent upon the level of solids in the water. Normally, one of
these filters is backwashed each day. Then in operation,
approximately 0.007 MGD of backwash water is required for each
filter. This flow is discharged to the floor drains to the boiler room
sump, which pumps to the yard-drain sump. The gravity filter
medium is changed out on an as-needed basis with the spent filter
media being landfilled.
Note: The Gravity Filters at Marshall are typically not needed and
therefore are bypassed under normal operating conditions due to the
installation of Pressure Filters.
Pressure Filters:
Marshall has four pressure filter trains. Each train consist of a
clarifier tank and a polisher tank. Chemicals are fed to the system
to coagulate solids and allow the larger particles to be caught in the
multimedia and allow filtered water to pass through to tanks on the
roof. Chemicals fed are ferric sulfate, calcium hypochlorite, a very
low dose of a Nalco proprietary flocculant called Cat Floc 8103 Plus
and caustic on an as needed basis. Total chemicals fed to the
system for the year are 12000 gallons of ferric sulfate, 275 gallons
of CatFloc8103 Plus, 20075 lbs of calcium hypochlorite and a
negligible quantity of caustic. Each filter train is typically
backwashed 1-2 times per day, but in rare cases need to be
backwashed more frequently based on incoming water quality.
Backwash volume required for 1 train is 11,400 gallons. Assuming
each filter train backwashes twice a day the total backwash volume
for the system is 0.09 MGD. The backwash water drains to the
boiler room sump.
Activated Carbon Filters:
Two activated carbon filters remove organics and the chlorine that is
injected into the pressure filters. These carbon filters are typically
backwashed approximately once a week. The flow of water required
to backwash one of these filters is 20,000 gallons per day. The wash
Page 6 of 14

Marshall Steam Station
• Supplemental Information for
NPDES Permit Renewal Application
March 2021
water flows to the boiler room sump and is pumped to the yard-drain
sump. Activated carbon is replaced on an as needed basis with the
spent carbon disposed of in an onsite landfill.
Reverse Osmosis System
There is a two stage Reverse Osmosis (RO) system which
processes approximately 535 gallons per minute of filtered water.
Approximately 400 gpm of permeate water is produced and flows to
the permeate water storage tank. Approximately 135 gpm of
concentrate water is produced which flows to the boiler room sump
and ultimately the ash basin via the yard drain sump. Water from
the permeate tank is pumped to the demineralizers as supply
water.
The RO system is cleaned approximately twiceperyear y pp y using a
dilute low pH cleaner (sulfonic acid/citric acid), biocide (Trisep
Tristat 110), and a high pH cleaner (sodium hydroxide/sodium
lauryl sulfate).
Demineralizers:
Demineralizers at MSS consist of two sets of mixed-bed cells which
supply make-up water to the boilers and other closed systems.
Normal plant operation requires that only one cell of each
demineralizer set operate at any one time. Each cell has a capacity
of 225 gpm.
Each cell is regenerated approximately every four weeks. Each year
MSS will use an estimated 8,000 gallons of 50% caustic and 2,500
gallons 93% sulfuric acid for demineralizer regenerations. The dilute
acid and caustic are discharged from the cell simultaneously through
the same header for neutralization purposes. The regeneration
wastes flow to the boiler room sumps where it is pumped to the LRB
via the yard-drain sump. The useful life of the resin varies and when
replaced spent resin is sluiced to the LRB.
2.6.3.2 Miscellaneous Waste Streams
• Closed system drainage, cleanings, testing containing corrosion
inhibitors (Calgon CS), biocides (Calgon H-550 and H 7330),
cleanings) (small heat exchangers), dispersant (polyacrylamide),
wetting agent (sodium lauryl sulfate), detergent (tri-sodium
phosphate), and leak testing (disodium fluorescing dye).
• Turbine room sump overflow
To date small closed system cleanings (e.g. heat exchangers) have not used these chemicals,
reserved for future use.
Page 7 of 14

Marshall Steam Station
• Supplemental Information for
NPDES Permit Renewal Application
March 2021
• Boiler seal water (trace oil and grease)
• Miscellaneous system leakages (small leaks from pump packings
and seals, valve seals, pipe connections)
• Moisture separators on air compressor precipitators
• Floor wash water
• Emergency firefighting water
• Pyrite (ash) removal system overflow
• Low Volume Wastewater, including internal boiler washes
2.6.3.3 Chemical makeup tanks and drums rinsate
Intermittent rinse water containing small amounts of Ferric sulfate,
sodium hydroxide, hydrazine, ammonium hydroxide.
2.6.3.4 Boiler blowdown
Discharge occurs primarily when units 1 & 2 startup and until water
chemistry stabilizes the blowdown from these boilers can flash in a
blowdown tank. During startup a significant portion of this blowdown
steam is vented to the atmosphere. After water chemistry has
stabilized, blowdown venting is minimal and condensate flow is
small. Trace amounts of hydrazine, ammonia, and silica oxide may
be present in the condensate. The combined condensate flow from
blowdown amounts to an average of approximately 0.002 MGD. This
flow is routed to the boiler room sump and then to the ash basin.
2.6.3.5 Boiler Cleaning
Boilers #1, #2, #3 and #4 at MSS are chemically cleaned on an as
needed basis. Tube inspections are performed during outages,
which indicate when cleaning needs scheduling. Boilers #1 and #2
are controlled circulation boilers and boilers #3 and #4 are
supercritical boilers. The wastes produced from a boiler chemical
cleaning are taken off site for disposal.
2.6.3.6 Preheater and Boiler External Wash
Approximately once per year rinse water is used to wash the
preheaters and external boiler components. This water is directed
to the holding basin for pH adjustment and settling.
2.6.4 Stormwater Runoff
The LRB collects/receives flows from the yard drainage basins. Some of
the flows pumped into the LRB from the yard drains include roof runoff,
stormwater discharge from transformer containments, stormwater
discharge from fuel oil containments, stormwater from the FGD facility, rail
lines, coal handling facilities, chemical storage and miscellaneous plant
equipment.
Page 8 of 14

Marshall Steam Station
• Supplemental Information for
NPDES Permit Renewal Application
March 2021
The drainage area includes the FGD gypsum radial stacker operation.
Stormwater runoff from this area enters a detention basin before
discharging into the holding basin that pumps water to the LRB.
2.6.5 Induced Draft Fan Motor Bearing Cooling Water
Once through non-contact cooling water is supplied to eight induced draft
(ID) fan motor bearings to remove excess heat. No chemicals are added to
the once through raw lake water. The rate of flow through the ID fan heat
exchangers that discharges to the yard-drain sumps is approximately 0.08
MGD, which is pumped to the LRB.
2.6.6 Track Hopper Sump
The track hopper sump collects ground water from a foundation drain
system underneath the track hopper. The flow is usually intermittent;
however, the pump capacity is 100 gpm. On a daily basis it is estimated
that the run time is only 50% which would correspond to a flow of 0.07 MGD
to the yard-drain sumps, which is pumped to the LRB.
2.6.7 CCW Tunnel-Unwatering Sump
In the event that maintenance activities are needed in the intake or
discharge tunnels an unwatering sump is provided to remove water from
the tunnels. Raw water in the tunnels can be pumped to the yard-drain
sumps that ultimately discharge to the LRB.
2.6.8 Turbine Non-Destructive Testing
Bore sonic testing of turbine rotors is infrequent, once every 5 years.
Demineralized water is mixed with a corrosion inhibitor, e.g. Immunol 1228,
at a ratio of 100 parts water to 1 part inhibitor. The mixture is applied to the
turbine rotors. The excess is drained and mixed with low volume
wastewater and discharged to the LRB via the yard-drain sumps.
2.6.9 Ash Silo Storm Water Sump
An ash silo system has been constructed for dry handling of the ash. This
system includes a sump for collection of rainfall runoff and washdown of the
silo area, which is pumped to the LRB. This sump's drainage area is
approximately 1 acre. Overall, this will be a minimal input to the LRB.
2.6.10 Selective Non-Catalytic Reduction (SNCR)
As part of the compliance with the North Carolina Clean Air Initiative
(NCCAIR), Marshall installed urea based "trim" Selective Non-Catalytic
Reduction (SNCR) systems on units 1, 2, and 4. The trim SNCR systems
are expected to reduce NOx emissions by approximately 20%. SNCR
systems operate by injecting urea liquor into the upper section of the boiler
where a chemical reaction occurs to reduce the NOx to water and nitrogen.
Some residual ammonia will be collected in the fly ash from the electrostatic
Page 9 of 14

Marshall Steam Station
• Supplemental Information for
NPDES Permit Renewal Application
March 2021
precipitators. Most of this ammonia will stay with the ash as it is handled
dry, but a small amount may be carried to the LRB. However, the operation
of the SNCR system is not expected to require additional treatment
capabilities to ensure compliance with NPDES permit limits. Marshall units
1, 2, and 4 currently are using this technology to reduce NOx whereas unit
3 operates a Selective Catalytic Reduction (SCR) system.
2.6.11 Selective Catalytic Reduction (SCR)
As part of the compliance with the North Carolina Clean Air Initiative
(NCCAIR), Marshall has replaced unit 3's SNCR with a more efficient
Selective Catalytic Reduction (SCR) system, capable of reducing NOx by
approximately 90%. This SCR utilizes a urea to ammonia (U2A) which
converts the urea liquor into an ammonia gas, external to the boiler in a
hydrolyzer. The hydrolyzer contains approximately 1000 gallons of urea
while in operation and periodic blowdowns occur to flush out sediment in
the bottom of each hydrolyzer. Small quantities of urea will be discharged
into the LRB from the blowdown process. Roughly, 10 gallons a week is
discarded during the blowdown process and is collected in the LRB.
Similar to the SNCR, the SCR will also result in small traces of ammonia
in the fly ash that is collected from the electrostatic precipitators. Most of
this ammonia will remain with the ash as it is handled dry, but a small
amount may be carried to the LRB. However, the operation of the SCR
system is not expected to require additional treatment capabilities to
ensure compliance with NPDES permit limits.
2.6.12 Ash Dry Handling
MSS utilizes electrostatic precipitators as its air pollution control devices.
Under normal plant operations, the dry fly ash captured in these
precipitators is collected in temporary storage silos for subsequent disposal
in a permitted on-site landfill or for recycling in off-site ash utilization
projects. Electrostatic precipitators at MSS are normally cleaned by
mechanically vibrating the wires and rapping the plates inside the
precipitator. Before major precipitator work is performed, they are cleaned
by a wash down. The wash water is pumped to the LRB from the yard-drain
sump.
Bottom ash from the boilers is sent to the submerged flight conveyor
system. The submerged flight conveyor system is a self-contained system.
Limited purge water is sent from this system to the FGD system. Potential
system changes are under evaluation in case the FGD system cannot
receive this limited purge to allow it to go the LRB under a flow restriction.
Bottom ash is sent to a permitted on-site landfill for disposal.
Page 10 of 14

Marshall Steam Station
Supplemental Information for
NPDES Permit Renewal Application
March 2021
2.6.13 Industrial Waste landfill Leachate
Marshall has an industrial landfill on-site for the disposal of primarily ash.
The leachate is routed to the LRB from this landfill. The LRB has been
receive the wastewater from the landfill leachate.
2.6.14 Holding Basin
A holding basin was constructed in order to provide additional
capacity prior to waste stream and stormwater discharging to the
LRB. Stormwater from the coal pile is pumped to the Holding
basin. The Holding Basin is designed, constructed, and operated to
hold the coal pile runoff which results from a 25 year, 24-hour
rainfall event. The Holding Basin is designed to allow various
vacuumed sediments and solids to be decanted prior to the
disposal of the resulting solids into the onsite landfill. Periodically,
any accumulated solids in the retention and holding basins will be
dewatered and disposed of in the facility's onsite landfill. Flows
from the holding basin are pumped to the LRB.
2.7 Internal Outfall 006 - FGD WWTS
A new Flue Gas Desulfurization (FGD) VWVTS system has been constructed. This
treatment system went into operation in 2019. This system consists of physical/chemical
treatment units, a bioreactor, and ultrafiltration systems. In addition to this VWVfS treating
FGD wastewater, the submerged flight conveyor system needs to be periodically purged.
This water goes to the FGD absorbers in a controlled process which ultimately is sent to
the FGD VWVfS for treatment. Solids settled and collected in the physical/chemical
system are handled via a series of filter presses and disposed of in the facility's onsite
landfill. The discharge from this internal outfall goes to the LRB.
2.8 Outfall 007 - Ash Basin Emergency Overflow
An emergency overflow exists for the ash basin. This outfall should never be used since
the ash basin is being closed and the water level due to dewatering is very low.
2.9 Internal Outfall 010
It is requested that this outfall be removed. The run-off from the coal pile is routed to the
LRB. The parameters being analyzed at internal outfall 010 are also being monitored at
Outfall 005.
3.0 Additional Information
The following information is provided to include areas that need to be addressed as they
relate to the NPDES permit program.
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Marshall Steam Station
Supplemental Information for
NPDES Permit Renewal Application
March 2021
3.1 Seeps
MSS has identified two seeps in the vicinity of the of the ash basin dam. These seeps
contribute a small amount of water to Lake Norman. They are currently regulated under
SOC WQ S17 009
3.2 Sanitary Waste
Sanitary wastes are pumped to an off-site municipal wastewater treatment facility.
3.3 Fuel and Oil Storage Tanks
The following above ground fuel and oil storage tanks are located at MSS:
• One 100-gallon fuel-oil tank (FGD);
( ),
• One 30,000-gallon fuel-oil tank (coal handling);
• two 500,000-gallon fuel-oil tanks (one closed; main plant);
• 500-gallon gasoline tank (main plant);
• four 750-gallon lubricating-oil tanks (coal handling);
• 400 gallon hydraulic-oil tank (coal handing);
• 1,000 gallon used-oil tank (coal handling);
• 100 gallon used-oil tank (main plant);
• 500 gallon used-oil tank (FGD); and
• 900 gallon used-oil tank (main plant)
At the time of this application, only one of the 500,000 gallon fuel-oil tanks is in service.
All above ground tanks at MSS have secondary containment provided that can contain
the entire contents of the tank. All oil storage facilities and oil filled equipment are
presently covered under Spill Prevention Control and Countermeasure Plans (SPCC)2.
3.4 Site Environmental Permits
• NPDES Permit No. NC0004987
• Industrial Storm Water Permit No. NCS000548
• Solid Waste Active Landfill Permit No.18-12
• Solid Waste Closed Landfill - Permit No.18-04
• EMC SOC - WQ S17-009
• Title V Permit No. 03676T57
• Several Stormwater Construction Permits (included upon request)
2 SPCC Plan required by 40 CFR 112.
Page 12 of 14

Marshall Steam Station
• Supplemental Information for
NPDES Permit Renewal Application
March 2021
4.0 CERCLA and 40 CFR 117 Hazardous Substances
The table below identifies hazardous substances located on-site that may be released
to the LRB during a spill. Substances listed are present in quantities equal to or greater
than the reportable quantity (RQ) levels as referenced in 40 CFR 117, 302 and 355.
This list is being provided in order to qualify for the spill reportability exemption provided
in 40 CFR 117 and the Comprehensive Environmental Response Compensation and
Liability Act (CERCLA).
Marshall Steam Station Hazardous Substances on Site in Excess of RQ
SUBSTANCE REPORTABLE AVERAGE SOURCE
QUANTITY QUANTITY
ONSITE
BENZENE 10 lb. 169 lb. powerhouse/fuel tanks
BENZENE, DIMETHYL 100 lb. 19,031 lb. powerhouse/fuel tanks
CALCIUM 10 lb. 1,698 lb. powerhouse
HYPOCHLORITE
SODIUM HYDROXIDE 1000 lb. 77,279 lb. powerhouse/wastewater
treatment
FERRIC SULFATE 1000 lb. 160,609 lb. wastewater
FERROUS CHLORIDE 100 lb. 12,010 lb. wastewater
HYDRAZINE 1 lb. 1,385 lb. powerhouse
MERCURY 1 lb. 10 lb. warehouse
NAPHTHALENE 100 lb. 18,634 lb. powerhouse/fuel tanks
NICKEL HYDROXIDE 10 lb. 45 lb. warehouse
SODIUM HYPOCHLORITE 100 lb. 275 lb. powerhouse
SODIUM NITRITE 100 lb. 215 lb. powerhouse
SULFURIC ACID 1000 lb. 35,638 lb. powerhouse/wastewater
treatment
The table above represents maximum quantities usually on-site at any given time. If a
spill of one of these substances in excess of the RQ did occur, it would be contained and
treated close to the source as practicable. If the release was not fully captured near the
source, it would be routed to the LRB where treatment would occur prior to being
discharged via outfall 005.
Page 13 of 14

Marshall Steam Station
Supplemental Information for
NPDES Permit Renewal Application
March 2021
5.0 Marshall Steam Station CWA 316 Reports
The 316 (a) and (b) reports are included in this application as described below.
5.1 316(a) Demonstration
During the term of this permit Duke Energy has continued to monitor the receiving
waters of Lake Norman to demonstrate a protection and propagation of balanced, and
indigenous community (BIC) of aquatic wildlife. The CWA §316(a) Balanced and
Indigenous Community Study Report included in this application provides information to
support that the current thermal limits and MSS operations have ensured the continued
protection and propagation of a BIC in Lake Norman. Therefore, Duke Energy requests
that the thermal variance for the Marshall Steam Station be continued for the next
permit cycle.
5.2 Marshall Steam Station 316(b) Report
The 316 (b) compliance report is included in this application submittal.
Page 14 of 14

CWA §316(a) Balanced and Indigenous
Community Study Report (2014-2020)
•
/1 r
f
MARSHALL STEAM STATION
Lake Norman, Terrell, North Carolina
NPDES Permit# NC0004987
Duke Energy Environmental Sciences
Duke Energy Environmental Center
13339 McGuire Nuclear Station Road
Huntersville, NC 28078
March 2021
4, DUKE
ENERGY®

ENERGY

CWA§316(a)Balanced and Indigenous Community Study Report(2014-2020)
MARSHALL STEAM STATION
Contents
Executive Summary 1
1 Introduction 3
1.1 Physical Description and Background 3
1.2 316(a) Demonstration Studies 3
1.3 Station Operations and Thermal Characteristics 4
2 Methodology 13
2.1 Limnology 13
2.2 Planktonic Community 16
2.3 Habitat Formers 16
2.4 Benthic Macroinvertebrate Community 16
2.5 Fish Community 16
2.5.1 Spring Electrofishing Survey 16
2.5.2 Fall Electrofishing Survey 17
2.6 Other Vertebrate Wildlife 17
3 Results and Discussion 18
3.1 Limnology 18
3.1.1 Water Quality 18
3.1.2 Water Chemistry 22
3.1.3 Productivity 25
3.2 Planktonic Community 26
3.3 Habitat Formers 27
3.4 Benthic Macroinvertebrate Community 27
3.5 Fish Community 28
3.5.1 Spring Electrofishing Survey 28
3.5.2 Fall Electrofishing Survey 36
3.6 Other Vertebrate Wildlife 39
4 Balanced Indigenous Assessment 41
5 References 42
Tables
Table 2-1. Limnological parameters and monitoring frequency(M =monthly,Q=quarterly) in Lake Norman
during 2014-2020(S=Surface only, SB=Surface and bottom, PZ= Photic zone) 14
Table 2-2. Limnological sampling schedule for Lake Norman by location. (X=All parameters,X1= No
Chlorophyll a,Xz=Water quality field measurements only) 15
Table 2-3. Analytical methods and reporting limits for parameters monitored in Lake Norman in 2014-2020 15

CWA§316(a)Balanced and Indigenous Community Study Report(2014-2020)
MARSHALL STEAM STATION
Table 3-1.Summary of surface water quality measurements made in Lake Norman during 2014-2020
monitoring. 19
Table 3-2. Summary of surface and bottom water chemistry results in Lake Norman during 2014-2020
monitoring. 24
Table 3-3. Summary of chlorophyll a concentrations (µg/L) in samples from Lake Norman during 2014-2020 by
season. 26
Table 3-4. Mean (and range)of water quality parameters for each zone(C and D)and lake-wide in Lake
Norman during spring 2014-2020 electrofishing. 28
Table 3-5. Number(No.) and biomass (kg) of fish collected from electrofishing within two zones(C and D) and
all of Lake Norman during spring 2014-2020 28
Table 3-6. Percent pollution tolerance,trophic guild,and percent of hybrids for fish collected from
electrofishing within two zones and lake-wide in Lake Norman during spring 2014-2020. Percent
hybrids are specific to only that taxa of fish (e.g., percent of sunfish in a zone that was classified as a
hybrid) 31
Table 3-7. Mean (and range) of water quality parameters for each zone (C and D)and lake-wide in Lake
Norman during fall 2017-2019 electrofishing. 37
Table 3-8. Number(No.) and biomass(kg) of fish collected from electrofishing within two zones(C and D) and
lake-wide in Lake Norman during fall 2017-2019. 37
Table 3-9. Location, behavior, and number of vertebrate wildlife observed in the MSS discharge area during
summer surveys in 2015-2020. Documented observations were not available for 2014. 40
Figures
Figure 1-4. Extreme winter plume model scenario. Predicted MNS and MSS thermal plume extents are
outlined in purple while lake background, or non-thermally influenced areal extents are outlined in
gray. Model calibrated to February 2007. 9
Figure 1-5. Extreme summer plume model scenario. Predicted MNS and MSS thermal plume extents are
outlined in purple while lake background, or non-thermally influenced areal extents are outlined in
gray. Model calibrated to September 2007 10
Figure 1-6a.Sampling locations and zones for 2014-2017 Lake Norman monitoring. 11
Figure 1-6b. Sampling locations and zones for 2018-2020 Lake Norman monitoring 12
Figure 3-1a.Temperature contour plots of Lake Norman main channel locations during February, May,August,
and November(left to right) in 2014-2017 (top to bottom).All temperatures are in °C. Locations 13
and 15 are in Zone C, and locations 15.9 and 62 are in Zone D. Locations 69, 72,and 80 are in the
riverine section above Zone D. 19
Figure 3-1b.Temperature contour plots of Lake Norman main channel locations during(left to right) February,
May,August, and November in (top to bottom) 2018-2020(through third quarter).All temperatures
are in °C. Locations 11.5, 13, and 15 are in Zone C, and locations 15.9 and 62 are in Zone D 20
Figure 3-2a. Dissolved oxygen contour plots of Lake Norman main channel locations during February, May,
August, and November(left to right) in the 2014-2017 (top to bottom) portion of the study period.All
concentrations are in mg/L. Locations 13 and 15 are in Zone C, and locations 15.9 and 62 are in Zone
D. Locations 69, 72, and 80 are in the riverine section above Zone D. 21
ii

CWA§316(a)Balanced and Indigenous Community Study Report(2014-2020)
MARSHALL STEAM STATION
Figure 3-2b. Dissolved oxygen contour plots of Lake Norman main channel locations during February, May,
August, and November(left to right) in the 2018-2020 (top to bottom) portion of the study period.All
concentrations are in mg/L. Locations 11.5, 13, and 15 are in Zone C, and locations 15.9 and 62 are in
Zone D. 22
Figure 3-3. Mean catch rate (CPUE) by number(top panel) and by weight(bottom panel) of all species
collected within two zones and lake-wide from electrofishing in Lake Norman during spring 2000 and
2003-2020. Error bars are 90%confidence intervals 30
Figure 3-4. Mean catch rate (CPUE) by number of stock size and larger Largemouth Bass(200 mm;top panel)
and Alabama Bass (180 mm; bottom panel) collected within two zones and lake-wide from
electrofishing in Lake Norman during spring 2000 and 2003-2020. Error bars are 90%confidence
intervals. 32
Figure 3-5. Mean catch rate (CPUE) by number of stock size (80 mm) a greater Bluegill (top panel) and
Redbreast Sunfish (bottom panel) collected within two zones and lake-wide from electrofishing in Lake
Norman during spring 2014-2020. Error bars are 90%confidence intervals. 33
Figure 3-6. Length-frequency of Largemouth Bass(left panels)and Alabama Bass(right panels) collected within
two zones and lake-wide from electrofishing in Lake Norman during spring 2014-2020. 35
Figure 3-7. Length-frequency of Bluegill (left panels) and Redbreast Sunfish (right panels) collected within two
zones and lake-wide from electrofishing in Lake Norman during spring 2014-2020. 36
Figure 3-8. Largemouth Bass (left panels) and Alabama Bass(right panels) condition (relative weight) by zone
of Lake Norman and by length category for fish collected during fall 2014-2019 electrofishing.The
horizontal line represents the median for each zone,the boxes represent the 25th and 75th percentile,
and the whiskers show 10'and 90th percentiles. 38
Figure 3-9. Bluegill (left panels) and Redbreast Sunfish (right panels) condition (relative weight) by zone of Lake
Norman and by length category for fish collected during fall 2014-2019 electrofishing.The horizontal
line represents the median for each zone,the boxes represent the 25th and 75th percentile, and the
whiskers show 10th and 90th percentiles 39
Appendices
Appendix A. 2018 Study Plan and NCDEQ Approval Letter.
Appendix B. Net capacity factors,expressed in percent(%), and monthly average discharge water
temperatures for MSS during 2014-2020.
Appendix C. Box and whisker plots depicting historical analytical data compared to 2014-2020.
Appendix D. Fish captured during 2014-2020 sampling in Lake Norman.
iii

CWA§316(a)Balanced and Indigenous Community Study Report(2014-2020)
MARSHALL STEAM STATION
Executive Summary
This report satisfies the monitoring requirements of Clean Water Act(CWA) §316(a) for continuance of
the existing thermal variance for Marshall Steam Station (MSS)through demonstration of no prior
appreciable harm on the biological community of Lake Norman. In accordance with the National
Pollutant Discharge Elimination System (NPDES) permit(No. NC0004987)for MSS and the North
Carolina Department of Environmental Quality(NCDEQ) approved 316(a)study plan (Appendix A),
biological surveys and supporting monitoring was conducted at Lake Norman to demonstrate the
continued protection and propagation of a balanced, indigenous community(BIC) of aquatic wildlife.
The study conformed to the specifications outlined in 40 CFR 125 Subpart H,the U.S. Environmental
Protection Agency's(USEPA)'s DRAFT 316(a)Guidance Manual(USEPA 1977),and the USEPA Region 4
letter to NCDEQ(2010).
This report presents operational and environmental data collected since the last 316(a) assessment of
balanced and indigenous populations in Lake Norman near MSS(Duke Energy 2014).As defined in 40
CFR 125.71(c),the term BIC is synonymous with the term balanced, indigenous population referenced in
the CWA and in previous MSS 316(a) reports.The current study period spanned seven years(2014
through the third quarter of 2020) and included an update in the monitoring program effective in 2018
(Appendix A). Information from the study period was compared with historical data, and biological data
was also evaluated against four primary BIC criteria defined in 40 CFR 125.71.The four criteria state that
BICs are biotic communities typically characterized by:
• Having diversity and representative trophic levels within expectations,
• The ability to self-sustain through successful reproduction and recruitment over seasonal
changes,
• Having adequate food items, and
• A lack of domination by pollution tolerant species.
Duke Energy has two permitted thermal discharges to Lake Norman, one from McGuire Nuclear Station
(MNS) down-lake near Cowan's Ford dam and one mid-lake at MSS.To evaluate the impacts of the MSS
thermal discharge on Lake Norman,two distinct zones(Zones C and D) were delineated. Zone C was in
the upper mid-lake in areas thermally influenced by the MSS thermal discharge.Zone D represented
non-thermally influenced uplake background conditions for comparison to Zone C.Additional sampling
occurred throughout the lake,farther downstream of Zone C,to better represent lake-wide conditions
that could affect overall BIC of the lake.
Lake Norman was classified as oligo-mesotrophic based on long-term and 2014-2020 nutrient and
chlorophyll concentrations.during the study period, consistent with historical trophic classifications of
the reservoir.Seasonal limnological data continued to affirm that Lake Norman provides a suitable
physicochemical environment for sustaining a balanced and indigenous biological community. Similarly,
field or literature surveys conducted for other biotic categories(e.g., plankton, habitat formers,other
vertebrate wildlife, macroinvertebrates) also support that Lake Norman is suitable for sustaining a BIC.
A total of 21,620 fish representing 28 distinct species (plus two hybrid complexes) and eight families
were collected from Lake Norman during the seven years of spring electrofishing. No temporal trends
were apparent in the relative abundance of fish collected within or among zones, although spatial
1

CWA§316(a)Balanced and Indigenous Community Study Report(2014-2020)
MARSHALL STEAM STATION
trends did exist with fish biomass increasing with distance uplake.This trend is likely related to higher
nutrient concentrations uplake rather than thermal influences from MSS.The proportion of fish with
different pollution tolerances and at different trophic levels was generally similar among zones.The
proportion of sunfish identified as hybrids was less than 6%with no pattern between thermally-
influenced and non-influenced zones.
Catch rates and size structures of representative important species(RIS; Largemouth Bass,Alabama
Bass, Bluegill, and Redbreast Sunfish) indicated multiple age classes of each species throughout the lake.
There were no observed differences between the thermally influenced zone and its associated reference
zone that would suggest negative effects to the fish populations as a result of operations at MSS.
Condition factors, an indication of fish health, were average or below average for all RIS. No patterns of
condition were observed that would indicate any negative impacts from operations at MSS. The 2014-
2020 data indicated that the Lake Norman fish community is balanced and is composed mostly of
indigenous species expected from a reservoir located in the NC Piedmont.Additionally, no threatened or
endangered species exist in the project area that may be impacted from the thermal discharge.
Under the current thermal variance conditions, no prior appreciable harm was present against the
survival, reproduction, development,and growth of BIC due to MSS operations.Additionally,the MSS
thermal plume has not blocked or inhibited access to any potential spawning habitat, spawning
activities, or the development of early juveniles of RIS and the BIC.Consequently,the current thermal
limits and MSS operations have ensured the protection and propagation of a BIC in Lake Norman.
2

CWA§316(a)Balanced and Indigenous Community Study Report(2014-2020)
MARSHALL STEAM STATION
1 Introduction
1.1 Physical Description and Background
Marshall Steam Station (MSS) consists of four generating units and a net capacity of 2,180 MW.The
station is located in Catawba County,Terrell, North Carolina on the western shore, about mid-lake, of
Lake Norman.The lake, which was formed in 1963 by the construction of Cowans Ford Dam (CFD) on the
Catawba River, was built primarily as a source of non-contact condenser cooling water(CCW) for steam
electric stations and for hydroelectric power generation. In addition to MSS,two other electric
generating stations are located on Lake Norman:332.5 MW Cowans Ford Hydroelectric Station located
18 km south of MSS and 2,466 MW McGuire Nuclear Station (MNS) located 0.9 km east of CFD. Lake
Norman is the largest impoundment in North Carolina with a surface area of 13,087 ha and shoreline
length of approximately 970 km at full pond elevation 231.6 m above mean sea level.The mean depth at
full pond is 10.3 m with maximum depth of approximately 34 m.The drainage area is roughly 4,662 km2
with a mean annual outflow of 75.6 cms at the dam and an approximate mean retention time of 207
days.
The CCW system at MSS utilizes once-through flow of raw water from Lake Norman that is pumped to
the station to cool system components and is then discharged back to the lake.The discharge of this
heated water, referred to as "thermal discharge", requires a CWA 316(a)thermal variance.The MSS
thermal discharge has been regulated through National Pollutant Discharge Elimination System (NPDES)
Permit No. NC0004987 since March 1976.The most recent NPDES permit renewal for MSS was issued in
2016,with subsequent major modifications effective on May 1, 2018 and October 1, 2020.Consistent
with the MSS preceding permits, monthly average thermal discharge limits at Outfall 001 (CCW
discharge) are 33.3 °C(92 °F) during November—June and 34.4°C(94 °F) during July—October.These
temperature limits are expected to be protective of biological communities in the receiving waterbody
(i.e., Lake Norman).
Assessment of the potential effects of thermal discharges on biological communities is a key component
of a thermal discharge variance.Section A. (26.) Clean Water Act Section 316(a) Thermal Variance of the
current MSS NPDES permit requires that for continuation of the thermal variance beyond the term of
the permit, reapplication "shall include a basis for continuation such as a) plant operating conditions and
load factors are unchanged and are expected to remain so for the term of the reissued permit; b)there
are no changes to plant discharges or other discharges in the plant site area which could interact with
the thermal discharges; and c)there are no changes to the biotic community of the receiving water body
which would impact the previous variance determination." Per the requirements of the current NPDES
permit and following prior agency coordination, Duke Energy prepared the 2018 Lake Norman 316(a)
Study Plan (2018 Study Plan)to address the field study components of the current 316(a)
demonstration.
1.2 316(a) Demonstration Studies
The initial MSS 316(a) demonstration study concluded, and the NCDEQ concurred,that MSS operations
and thermal discharge limits(33.3 °C monthly average for November—June,and 34.4°C for July-
October)were compatible with the maintenance of a balanced, indigenous community(BIC) in Lake
Norman (Duke Power Company 1975). Subsequent studies have continued to demonstrate that the
thermal discharge of MSS ensures the protection and propagation of a BIC in Lake Norman (Duke Power
3

CWA§316(a)Balanced and Indigenous Community Study Report(2014-2020)
MARSHALL STEAM STATION
Company 1994; Duke Power 1999, 2004b; Duke Energy 2009, 2014).As a result of over 40 years of
studying the limnology and biota of Lake Norman,changes to the monitoring program were initiated
upon the completion of the previous 316(a)demonstration reporting period (2009-2013) and NPDES
permit application submittal in 2015.
Following a meeting with the NCDEQ on February 20, 2017, Duke Energy discontinued further
monitoring of macroinvertebrates in Lake Norman due to the limited value that additional benthic
macroinvertebrate community sampling would contribute to BIC determination on Lake Norman. For
similar reasons, phytoplankton and zooplankton monitoring were also discontinued.Several new
monitoring locations were added, riverine locations were removed, and adjustments were made to the
distribution of electrofishing transects.These and other changes that were discussed with the NCDEQ
provided the basis for the 2018 Study Plan.The 2018 Study Plan was submitted to NCDEQ and USEPA on
March 5, 2018; NCDEQ approval was received March 15, 2018(Appendix A).
This report summarizes comprehensive water quality and biological data collected first quarter 2014
through third quarter 2020.Consistent with previous reporting periods, MSS operations and thermal
limits were assessed with respect to protection of a BIC using these data from the study period and
historical data collected from Lake Norman. Monitoring results include MSS operations, physicochemical
reservoir condition, plankton, habitat formers, macroinvertebrates,fisheries, and other vertebrate
wildlife data.
1.3 Station Operations and Thermal Characteristics
Station capacity factors,along with cooling water temperatures, have a direct effect on the resulting
thermal discharge into the lake. When maintenance is performed, capacity is reduced, whereas gains
in unit efficiency at MSS can potentially result in>100%capacity.The continuous operation of MSS
from 2014 through 2020 was similar to previous years.The average annual unit capacity ranged from
21.2%for Unit 1 in 2018 to 74.5%for Unit 3 in 2014 (Table 1-1).
The NPDES thermal compliance discharge limit for MSS, expressed as a monthly average, is 33.3 °C(92
°F) during November—June and 34.4°C(94°F) during July—October.These thermal discharge limits
were met throughout the study period.The maximum monthly average of 34.4°C(93.9°F)was reported
in September 2016. Peak monthly average temperatures for the other 6 years of this study period
ranged from 30.9°C(87.6°F)to 32.2 °C(90.0°F) in 2014 and 2015, respectively(Appendix B).
Meteorological forces can exert significant influences, both directly and indirectly, on the physical,
chemical, and biological characteristics of aquatic ecosystems, and documentation of local and regional
meteorology can often provide insight into the spatial and temporal dynamics in these characteristics
(Wetzel 2001).Two important meteorological parameters are air temperature and precipitation, and
data for these two variables were obtained from a meteorological monitoring site established near
MNS.These data serve to document localized temporal trends in air temperatures and rainfall patterns.
Air temperatures influence variability in a waterbody's thermal regime via seasonal water column
heating and cooling.Average air temperatures recorded at nearby MNS during 2014-2020 were
generally higher than average air temperatures during 1990-2013. Notably higher than average air
temperatures were recorded in December 2015, March 2016, February 2017, February and
September 2018, May, September, and October 2019, and March 2020 with monthly means 3.2-6.2
°C greater than the 1990-2013 average(Figure 1-1). Mean monthly air temperatures greater than 2.0
4

CWA§316(a)Balanced and Indigenous Community Study Report(2014-2020)
MARSHALL STEAM STATION
°C below the 1990-2013 average occurred in only five months(January, March,and November 2014,
February 2015, and January 2018; Figure 1-1).
30 - 1990-2013
2014
•+� -♦— 2015
—0- 2016
25 - • • 0 2017
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Figure 1-1.Mean monthly air temperatures by year during the study period compared to 1990-2013 monthly
mean.
Precipitation affects hydrologic characteristics in aquatic ecosystems by controlling water volume,
inflow rates, and water column mixing. This hydrodynamic influence can be additionally magnified or
modified by reservoir outflow characteristics, resulting in variations in spatial and temporal water
5

CWA§316(a)Balanced and Indigenous Community Study Report(2014-2020)
MARSHALL STEAM STATION
quality and biological regimes. In addition to influencing hydrologic and hydraulic characteristics,
precipitation can impact water quality by direct chemical loading associated with atmospheric
chemistry or indirectly via constituent loading associated with watershed runoff.The rainfall totals
measured during the current study period were generally above the 1990-2013 average, however,
only the below-average rainfall total in 2016(83 cm)and the above-average rainfall in 2018 (140 cm)
were outside one standard deviation of the average (Figure 1-2). Monthly precipitation totals ranged
from 0 cm in September 2019 to 21.9 cm in November 2015(Figure 1-3).Two major hurricanes
impacted the MSS area during fall 2018(Florence in September and Michael in October)that
contributed to the above average rainfall in those months(Figure 1-3).These rainfall patterns directly
affected the discharge into and out of the reservoir.
180 -
160 -
140 -
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Figure 1-2.Total annual precipitation recorded at MSS during current study period(dark bars)compared to the
1990-2013 mean(horizontal line). Note 2020 data only includes precipitation through the third quarter.
6

CWA§316(a)Balanced and Indigenous Community Study Report(2014-2020)
MARSHALL STEAM STATION
25 -
0 1990-2013
f 2014
—0— 2015
20 - O —0— 2016
0 2017
E
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Figure 1-3.Total monthly precipitation recorded at MSS during current study period compared to 1990-2013
monthly mean.
The thermal influence of MNS and MSS was originally determined through thermal infrared surveys and
temperature modeling(Duke Power Company 1985).Thermal plume maps were developed from an
airborne thermal infrared survey as part of the original 1985 316(a)demonstration, and again in 1991 as
part of MNS NPDES permit renewal efforts (Duke Power Company 1985; Duke Power Company 1991).
The thermal influence of each facility was re-assessed in 2017 using a calibrated hydrodynamic model
(CE-QUAL-W2).The model was configured to simulate lake temperatures in an extreme meteorological
year(2007)when summer and winter plumes would be expected to cover the largest areal extent.The
7

CWA§316(a)Balanced and Indigenous Community Study Report(2014-2020)
MARSHALL STEAM STATION
modeling simulations included 2 scenarios: 1)a background scenario in which the heated discharges of
MNS and MSS were removed from the model and 2) a discharge influenced scenario in which the heated
discharge from MNS and MSS remained in the model.The difference in epilimnetic temperatures among
scenarios delineated the extent of the areal thermal plume [defined by 2.8°C(5 °F) above background,
consistent with the initial 1985 delineation (Duke Power Company 1985)].
Maps delineating the winter and summer spatial extent of MNS and MSS areal thermal plumes based on
the 2017 modeling efforts are presented in Figures 1-4 and 1-5. These maps revealed recent
meteorology and station operations have not substantially altered the initial 1985 delineation. The
model confirmed the thermal plumes remained constrained to zone delineations previously determined
in 1985 and the thermal plumes from MNS and MSS remained disconnected (Figures 1-4 and 1-5). Lake
sampling zones were established based on the thermal plume delineations from 1985 and the 2017
model confirmations.These zones are described below and depicted in Figures 1-6a and 1-6b,with
emphasis shown for Zones C and D that are the focus of the MSS 316(a)demonstration.
Zone A—lower portion of Lake Norman influenced by MNS thermal discharge,
Zone B—non-thermally influenced reference area separating the thermal plumes of MNS and MSS,
Zone C—middle portion of Lake Norman influenced by the thermal discharge of MSS, and
Zones D and E—MSS non-thermally influenced reference areas (Zone E is riverine and was
discontinued as a reference area).
8
L

CWA§316(a)Balanced and Indigenous Community Study Report(2014-2020)
MARSHALL STEAM STATION
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t-t;j i '�y..1
�jx
A . .,,,k1 Va i, •:;:'
\3 t,,-.4 ,,,-..1-'.),, ,,,,,,:.1.4
; 4.
1
Figure 1-4. Extreme winter plume model scenario. Predicted MNS and MSS thermal plume extents are outlined
in purple while lake background,or non-thermally influenced areal extents are outlined in gray. Model
calibrated to February 2007.
9
L

CWA§316(a)Balanced and Indigenous Community Study Report(2014-2020)
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,. ,,e,ti
•mot.Jr :i j_}�{,
't/, :�Lf .VP
••:, , 1 .::),ki�i
' t
,�,1I ��,„
r
,u
y ` rl N` o't't"
a ;
•`-e'y ....,�- 0 k) ���1��WWW1)) '•.mil
Yl♦ y�i'v Mi
1 r„.:s.:.1r, 1/4.'111 c-:•,:i...f.,
,. ...- ..,., q,, ,-1.-1 ,s, .te
1 lib .
•
Figure 1-5. Extreme summer plume model scenario. Predicted MNS and MSS thermal plume extents are outlined
in purple while lake background,or non-thermally influenced areal extents are outlined in gray. Model
calibrated to September 2007.
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I-4o
N
p 80.0
MSS 316(a) Lake Zones:
o 72.0 C MSS Thermal Influence
D MSS Background
'Zone Ej i
€169.0 E Riverine/Lake Transition
Sampling Locations: y., ,k,
#.# 0 Water Quality 0
+ Productivity ®62.0
•• `Zone Di
• Electrofishing
• •
15.9
Skimmer Wall- 15.0
Marshall , JO Mooresville
Steam ■ (2 mi_)
Station .(4.0 ./}0
-1
Hwy 150 �0 • ••
Zone C
Zone B
MNS
N. R. Z,` I y3"•�— ✓!s. ' 3 Background
• Si
Denver
• 11.0 �• �t
•
9.5
63
•• •
•
/ Davidson
°i ®8.0
Hwy73 c4 .•
t_:
2.0 Zone A
®• 950 _ Hwy 73
/DQ
9 MNS
COWdnS�. aIF--�'-:— r✓ Thermal
0 1 2 4 Miles Ford Dam_ j� Influence
1 I 1 I McGuire Nuclear Charlotte
0 1.5 3 6 Kilometers Station 114 mi.)
Figure 1-6a.Sampling locations and zones for 2014-2017 Lake Norman monitoring.
11

CWA§316(a)Balanced and Indigenous Community Study
ARSHALL ReportSTEAM(2014-2020)STATION M
. ' r, 6,9f -.. N
`43132.0ti v
A
_ ZoneD
Sampling Locations: ,.. . ,, , , ,,
#.# 0 Water Quality 1.,"/
• Electrofishing 'I r 7
15.9 , �;b rs
A.
Skimmer Wall _, `, MRSV
r
`,slr c INT 4
Marshall 1. 154 cal H 150
Steam i Mooresville
y 40''�. «fit % i)
Station ��
• --- —fa
� -�_
Zone D
--- - , y Zone C -
O : : i:
•
11.5 i,7
Zone B
MNS
• 11.0'' Background
Denver • O
. 9.5
O
x • •
Davidson
rn •• 8.0O •
MSS 316(a)Lake Zones: •
•
C MSS Thermal Influence
7.5 •
D
MSS Background •
•
\ •
p I Zone Al
Hwy7
0 0 5 1 2 les' C ns 1.0 • 4.0 _MNS 3
Thermal
l i I Ford m�• • influence McGuire Nu ar---•• Charlotte
0 0.75 1.5 3 Kilome ers Station ! - (14 mi.)
Figure 1-6b.Sampling locations and zones for 2018-2020 Lake Norman monitoring.
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2 Methodology
2.1 Limnology
Limnological data were used to characterize the environmental conditions of Lake Norman.These data
were collected to help provide an understanding of the basic productivity of the reservoir ecosystem
and potential chronic or acute changes in aquatic communities.Water quality and chemistry data were
also evaluated in consideration of cumulative influences with the thermal discharge on a BIC.
Water quality and chemistry monitoring performed in Lake Norman during 2014-2020 is outlined in
Tables 2-1 and 2-2. Field parameters(temperature, dissolved oxygen [DO], pH, and specific conductivity)
were measured in situ at each sampling location with a multiparameter data sonde such as Hydrolab
(OTT Hydromet, Loveland,Colorado) or Aqua TROLL(In-Situ, Inc., Fort Collins, Colorado). Measurements
started at the lake surface(0.3 m)and continued at one-meter intervals to 10 m,then two-meter
intervals to the lake bottom. Pre-and post-calibration procedures associated with operation of the
Hydrolab were documented in both electronic and hard-copy format. Hydrolab and Aqua TROLL data
were captured and stored electronically and converted to spreadsheet format following data validation.
Water samples for laboratory analysis were collected by various means depending on the sample depth
and analyte. Surface (0.3 m) samples were collected via peristaltic pump or direct dip. Bottom samples
(one meter above lake bottom) were collected with a Van Dorn water sampler. Beginning in 2018,
nutrient samples were collected from the photic zone(2 x measured secchi depth)—instead of the
surface—using an integrated depth sampler. Chlorophyll a samples were also collected from the photic
zone. However, prior to 2018 these were obtained from a predetermined photic zone depth by
compositing duplicate Van Dorn sample retrievals from 0.3 m,4.0 m, and 8.0 m at each location,except
at Location 69.0 where samples were collected from 0.3,3.0,and 6.0 m due to shallower photic depth.
Water collected from the three discrete depths was composited into a single sample at all locations. .
Samples were collected on a quarterly basis(Tables 2-1 and 2-2)throughout the study period.Samples
were collected in high-density polyethylene (HDPE)or polyethylene terephthalate(PET)sample bottles.
Dissolved-fraction samples were field-filtered with a 0.45-µm in-line disposable filter capsule and
peristaltic pump. Filter capsules were pre-rinsed by running>500 mL of sample water through the filter
prior to discharging into the sample bottles. Unfiltered and filtered sample bottles were pre-acidified
where applicable. For metals, total metals concentrations were collected from 2014-2017; dissolved
concentrations were collected throughout the seven-year study period (2014-2020). Water samples
were stored in a sample cooler on ice and in the dark immediately following collection to minimize the
potential for physical,chemical, and/or microbial transformation.
Laboratory analytical methods, reporting limits, and sample preservation techniques are included in
Table 2-3. Water chemistry samples included in this study were analyzed by a State-certified laboratory,
primarily the Duke Energy Analytical Laboratory located in Huntersville, NC(North Carolina Division of
Water Resources [NCDWR] Certification#248). Other contract laboratories utilized during the study
period (e.g., Pace Analytical, Inc.) were confirmed to have current NCDWR Laboratory certifications for
the parameters being analyzed. Standard Chain of Custody procedures and documentation were
followed throughout these analyses.
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Water quality and analytical chemistry data were subjected to various numerical and graphical
techniques to evaluate spatial and temporal trends within the lake, interrelationships among
constituents, and the potential effect on lake biota.Trophic state index(TSI; Carlson 1977),which
assesses the overall productivity of the lake, was one metric evaluated. TSI values for phosphorus,
Secchi depth, and chlorophyll a were calculated to standardize these select physiochemical variables for
comparison.TSI values range on a scale of 0 to 100 and are considered in relation to the intended use of
the waterbody and BIC support.
Data were evaluated using seasonal comparisons between zones and historical comparisons within
zones.Also, data within each zone were compared to lake-wide values for context. Comparisons for
assessing potential impacts within the MSS thermal influence zone (Zone C) were allowed by the
availability of non-thermally influenced reference areas(Zone D) immediately upstream to the north
and northwest.The Zone D reference areas are located upstream to the north in upper reaches of Lake
Norman and to the northwest in Little Mountain Creek arm of Lake Norman.Analytical results reported
to be equal to or less than the method reporting limit were evaluated at half the reporting limit for
numerical and statistical assessments.
The 2014-2020 data were compared to historical data to evaluate changes in the waterbody during the
study period and detect long-term trends(Appendix C). For the purposes of this report, historical water
quality and analytical data included the years 1990-2013.These years had consistency in data analysis
and environmental factors with current years(e.g., MNS thermal discharge limits further downlake) .
Table 2-1. Limnological parameters and monitoring frequency(M=monthly,Q=quarterly)in Lake Norman
during 2014-2020(S=Surface only,SB=Surface and bottom,PZ=Photic zone).
2014-2017 2018-2020
WATER QUALITY
Temperature M Q
Dissolved oxygen M Q
pH M Q
Specific conductivity M Q
NUTRIENTS
Total phosphorus Q-SB Q-PZ
Orthophosphorus Q-SB Q-PZ
Ammonia nitrogen Q-SB Q-PZ
Nitrite+nitrate nitrogen Q-SB Q-PZ
Total Kjeldahl nitrogen Q-SB Q-PZ
MAJOR IONS
Calcium Q-SB Q-S
Magnesium Q-SB Q-S
Potassium Q-SB
Sodium Q-SB
Chloride Q-SB Q-S
Sulfate Q-SB Q-S
PHYSICAL
Secchi Q-5 Q-S
Turbidity Q-SB Q-S
Hardness(Calculated) Q-SB Q-S
METALS(TOTAL AND DISSOLVED)
Copper Q-SB
Zinc Q-SB
METALS(DISSOLVED)
Copper Q-S
Zinc Q-5
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Table 2-2. Limnological sampling schedule for Lake Norman by location.(X=All parameters,X1=No Chlorophyll
a,X2=Water quality field measurements only)
I-
z
>
o Jr, 0 0 o till m O o o O
tit O O 0 0 CV 'Q Jr; O in .--1 ,-1 r i Q u N c� N N O
.-1 l 00 a; .-1 ,i .--1 .-I .--I .1 .-1 2 to lD 1-• 00
Zone A Zone B Zone C Zone D Zone E
2014 Xl X X2 X X X X X X1 X1 X X2 X X2 X2
2017
2018- X X X X X X X X X X X X X X X
2020
Table 2-3.Analytical methods and reporting limits for parameters monitored in Lake Norman in 2014-2020.
Reporting
Parameter Method (EPA/APHA) Preservation
Limit
Temperature Thermistor,APHA 2550 In situ 0.1°C
Oxygen, Dissolved Luminescent(LDO)cell,ASTM D888-09-C In situ 0.1 mg/L
pH Glass Electrode, EPA 150.2 In situ 0.1 unit
Conductance,Specific Thermistor, EPA 120.1 In situ 1 µS/cm3
Secchi Hutchinson 1975 N/A N/A
Turbidity Turbidimetric, EPA 180.1 56°C 0.05 NTU
Chlorophyll a (Rodriguez, 1982) Ice, darkness 2 µg/L
Ammonia Colorimetric, EPA 350.1 56°C, H2SO4,pH<2 0.02 mg/L
Total Kjeldahl Nitrogen Colorimetric, EPA 351.2 56°C, H2504, pH<2 0.1 mg/L
Nitrite+Nitrate Colorimetric, EPA 353.2 56°C, H2SO4,pH<2 0.01 mg/L
Phosphorus,Total Colorimetric, EPA 365.1 56°C, H2SO4,pH<2 0.005 mg/L 1
Orthophosphorus Colorimetric, EPA 365.1 56°C 0.005 mg/L
Calcium ICP, EPA 200.7 .56°C, HNO3,pH<2 0.01 mg/L
Magnesium Atomic Emission/ICP, EPA 200.7 56°C, HNO3,pH<2 0.005 mg/L
Potassium Atomic Emission/ICP, EPA 200.7 56°C, HNO3,pH<2 0.1 mg/L
Sodium Atomic Emission/ICP, EPA 200.7 56°C, HNO3, pH<2 1.5 mg/L
Chloride Ion Chromatography, EPA 300.0 56°C 0.1 mg/L j
Sulfate Ion Chromatography, EPA 300.0 56°C 0.1 mg/L
Total Hardness Calculation,SM 23406 N/A N/A
Copper,Total Recoverable ICP Mass Spectroscopy, EPA 200.8 56°C, HNO3, pH<2 1.0 µg/L
Copper, Dissolved ICP Mass Spectroscopy, EPA 200.8 56°C, HNO3, pH<2 1.0 µg/L
Zinc,Total Recoverable ICP Mass Spectroscopy, EPA 200.8 56°C, HNO3,pH<2 5 µg/L
Zinc, Dissolved ICP Mass Spectroscopy, EPA 200.8 56°C, HNO3, pH<2 5 µg/L
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2.2 Planktonic Community
Phytoplankton and zooplankton are generally considered to be low potential impact (LPI) biotic
categories,therefore narrative assessments of these components were made and included within the
framework of the Lake Norman BIC.The assessment of plankton as LPI was performed using scientific
literature and historical planktonic community data collected from Lake Norman (Duke Energy 2019).
The validity of using a narrative approach can be found in the most recent 316(a) review by Coutant
(2013).
2.3 Habitat Formers
Habitat formers are defined as assemblages of living or once living plants and animals with relatively
sessile life stages that may have aggregated distributions.Such assemblages may function as living
substrate for epibiota, direct or indirect food sources, biological mechanisms for sediment stabilization,
nutrient cycling pathways or traps, and/or spawning or rearing habitats(USEPA 1977). In Lake Norman,
habitat formers are primarily comprised of aquatic plant communities including submersed,floating,
and emergent macrophytes.Aquatic macrophyte surveys were documented during three years of the
study period—October 2018 and 2019 and September 2020.These surveys were conducted by North
Carolina State University(NCSU) at 888 to 947 points along the shoreline of Lake Norman south of
Highway 150.Aquatic macrophytes were also surveyed north of Highway 150 by Duke Energy staff at an
additional 681 points along the Lake Norman shoreline in 2019 and 1,550 points in 2020.Aquatic
macrophytes were collected during these surveys by performing replicate rake tosses in 1.2-3.6 m deep
water. Macrophytes were identified to species and abundance was ranked from 0 (no macrophytes)to 4
(75-100%coverage).Spatial coverage was quantified using georeferenced sonar data and ArcMap
version 10.5.1 and 10.7.1 (NCSU 2018, 2019, 2020).
2.4 Benthic Macroinvertebrate Community
As with phytoplankton and zooplankton, benthic macroinvertebrates are generally considered LPI biotic
categories in reservoir environments.A narrative assessment was conducted to describe benthic
macroinvertebrate communities within the framework of the Lake Norman BIC.The assessment of
macroinvertebrates as LPI was performed using scientific literature and historical macroinvertebrate
data collected from Lake Norman (Duke Energy 2014).
2.5 Fish Community
Fish monitoring conducted on Lake Norman during 2014-2020 included the following components:
spring littoral fish population electrofishing survey with focus on community composition and relative
abundance, fall littoral fish population electrofishing survey with focus on condition factors of RIS, and
assessment of representative important species(RIS)for spring and fall electrofishing.
2.5.1 Spring Electrofishing Survey
Spring electrofishing surveys were conducted in Lake Norman during March or April 2014-2020. Five
(2014-2017) or eight (2018-2020), shoreline transects were surveyed in each of two zones of Lake
Norman associated with MSS (Figures 1-6a and 1-6b).An additional 10 or 16 transects were included
farther downlake to assess lake-wide conditions(Figures 1-6a and 1-6b).Transects consisted of
16

CWA§316(a)Balanced and Indigenous Community Study Report(2014-2020)
MARSHALL STEAM STATION
approximately 1000 seconds of shock time and many either replicated or were near historical locations
sampled since 1993.Transects included habitats representative of those typically found in Lake Norman.
Shallow flats with limited boat access within 3 to 4 m of the shoreline were excluded.All sampling was
conducted during daylight, when surface water temperatures were between 15 and 23 °C(Miranda and
Boxrucker 2009).Surface water temperature, dissolved oxygen, pH, and specific conductance were
measured at each transect with a calibrated meter. Electrofishing transects paralleled the shoreline and
total shock time was recorded. Stunned fish were collected by two netters(only one netter was used in
2020 due to Covid-19) and held in a live well until the transect was completed. Fish were identified to
species, enumerated, and for each transect a subsample of each species was measured for total length
(TL, mm)and weighed to the nearest gram.
Data collected during the spring electrofishing surveys were used to assess the balanced and indigenous
nature of the Lake Norman fish community and provide information relative to the potential thermal
influence of MSS.The assessment included spatial comparisons of RIS, length distributions, species
pollution tolerance,trophic guild, hybrid complexes, and species origin. For this study, RIS were
identified as Largemouth Bass Micropterus salmoides,Alabama Bass M. henshalli, Bluegill Lepomis
macrochirus,and Redbreast Sunfish L. auritus. Mean catch-per-unit-effort (CPUE)was calculated for
each zone along with 95%confidence intervals. Comparisons were made among zones and across years
by comparing confidence intervals. Length-frequencies were visually compared among zones.
2.5.2 Fall Electrofishing Survey
Electrofishing surveys were conducted in October or November 2017-2019 at the same transects as the
spring surveys on Lake Norman (Figures 1-6a and 1-6b).All sampling methodology for the fall survey was
the same as during the spring. Like the spring electrofishing surveys, data collected during the fall
electrofishing surveys were used to assess the balanced and indigenous nature of the Lake Norman fish
community and provide information relative to the potential thermal influence of MSS. Specifically,fall
electrofishing data were used to compare the condition (relative weight)of each RIS between zones.A
standard weight equation does not exist for Redbreast Sunfish, however an equation has been created
from data collected by Duke Energy(unpublished data).
2.6 Other Vertebrate Wildlife
Wildlife observations associated with the MSS 316(a)studies were conducted for aquatic wildlife species
or species that use the MSS aquatic system during activities such as foraging, reproduction, and other
life functions.Observations were conducted during the summer at areas most directly influenced by
thermal discharge in Zone C. Additionally,these observations were augmented by literature reviews of
pertinent information (e.g., U.S. Fish and Wildlife Service [USFWS] listed species county list, USFWS
Information for Planning and Construction [IPAC] database)to determine whether any federally-listed
species or other vertebrate wildlife RIS species(recreationally/commercially valuable species)could be
present near MSS. Information regarding the protected and federally listed species were obtained via
the United States Fish and Wildlife Service's (USFWS) Mecklenburg County, NC county-wide list(USFWS
2020).
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3 Results and Discussion
3.1 Limnology
3.1.1 Water Quality
Water temperatures in reservoirs, such as Lake Norman, are influenced by physical factors, including
incident solar thermal energy, inflows from the watershed,thermal inputs from industrial and municipal
discharges, and physical characteristics such as depth, clarity and reservoir inflow and outflow rates.
Each of these factors can be temporally and spatially variable in large reservoirs like Lake Norman
(Hannan et al. 1979; Cole and Hannan 1990).Analysis of historical thermal data for Lake Norman has
illustrated that temporal (seasonal and annual) and spatial (horizontal and vertical)variations in water
temperatures are largely governed by the factors listed above, and the thermal plumes from MNS and
MSS are primarily localized (Duke Power Company 1985; Duke Energy 2018b).General patterns of well-
mixed winter conditions and highly stratified summer conditions emerge each year due to the
monomictic nature of the reservoir. Lake Norman followed similar seasonal thermal stratification and
destratification regimes during 2014-2020 (Figures 3-la and 3-1b). Full depiction of thermal profiles
collected during the study period are represented by the profiles provided in the 2016-2018 MNS 316(a)
Balanced and Indigenous Population report(Duke Energy 2019).
During the 2014-2020 monitoring period, surface water temperatures in thermally influenced Zone C
ranged from 7.9 °C to 31.3 °C with a mean of 20.4°C.While the low was warmer than the minimum
temperatures of 6.5°C in Zone D and 6.2 °C lake-wide,the mean and maximum temperatures were
similar to the mean and maximum of Zone D (Table 3-1). The maximum surface water temperature
measured in Zone C was 3.2 °C cooler than lake-wide.The mean surface water temperature measured
where the MSS discharge canal meets Lake Norman was 23.0°C(Table 3-1).
Water temperature profile data showed warmer, physically buoyant, discharge water near the surface.
Relatively cooler water was observed at depth and was available as refuge for cool water species.
Seasonal profile data at main-channel locations indicated Lake Norman as a whole,followed similar
thermal patterns each year(Figures 3-la and 3-1b). Differences amongst years were largely related to
seasonal weather patterns(e.g., warm spring 2016 compared to more moderate air temperatures in
2018).Water temperatures in the thermally influenced Zone C downstream of MSS were within
historical ranges for each season. Lake-wide, however, surface water temperatures surpassed historical
ranges for each season (Appendix C). Lake Norman water temperatures continue to be suitable for
supporting the warmwater fish community expected in a North Carolina Piedmont reservoir(Beitinger
et al. 2000).
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Table 3-1.Summary of surface water quality measurements made in Lake Norman during 2014-2020
monitoring.
NC water MSS discharge
quality canal Zone C Zone D Lake-wide
Parameter standard Mean Range Mean Range Mean Range Mean Range
Temperature(°C) S 32°C 23.0 10.3-32.4 20.4 7.9-31.3 20.0 6.5-31.7 20.3 6.2-34.5
Dissolved Oxygen(mg/L) >_4.0 mg/L 7.2 0.4-11.5 8.7 3.8-12.3 9.4 6.5-12.9 8.8 3.8-12.9
pH 6.0-9.0 6.9 6.5-7.3 7.3 6.7-8.3 7.6 6.9-9.0 7.4 6.6-9.0
Specific conductivity(µS) - 69 54-81 59 47-73 56 45-68 56 45-73
Locations
1 F.3 18
12 S 11 13 10 52 53 72E0 12 8 11 13 95115902 59 72fr0 12 5 Ft 15 15 i 55 at 59 ]250 12 8 11 13 15182 89 7285
5
10
All
15
plip
20
25
30
35
o
5ME6
,0 ME 8
is Mill 10
m _ 12
25 = 14
E .Fir I= 16
- 18
o- 5 IM= 20
r Ilir 11.111 22
24
p f. 26
25 ® 28
" Ell 30
>6 = 32
°
5
q
15
2,
25
is
25
10 20 3o ao 10 20 30 q 10 20 30 W 10 A 35 10
Distance from dam (km)
Figure 3-la.Temperature contour plots of Lake Norman main channel locations during February,May,August,
and November(left to right)in 2014-2017(top to bottom).All temperatures are in°C.Locations 13 and 15 are in
Zone C,and locations 15.9 and 62 are in Zone D.Locations 69,72,and 80 are in the riverine section above Zone
D.
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Locations
01 758 11 115 13 1515.9 82 1 7.58 11 11.513 1515.9 02 1 758 11 11513 15 159 8 1 758 11 11513 15 155 82
5
10
15.P plIP,
20 C 25 6
30 8
35
0 10
5 12
10 14
0.
ire"5 16
25 j18
25 20
'0 M 22
35
0 5 10 15 20 25 30 24
5 26
111128
15 Ell No Data 30
20 32
25
30
35
10 15 20 25 3 5 10 15 20 25 n 5 10 20 25 30
Distance from dam (km)
Figure 3-1b.Temperature contour plots of Lake Norman main channel locations during(left to right)February,
May,August,and November in(top to bottom)2018-2020(through third quarter).All temperatures are in°C.
Locations 11.5,13,and 15 are in Zone C,and locations 15.9 and 62 are in Zone D.
Thermal stratification in Lake Norman begins coincidental with post-winter atmospheric heating,
typically in March.Vertical DO concentrations begin decreasing by April and progressively decrease into
early summer as stratification increases (Figures 3-2a and 3-2b). During this time, DO concentrations in
the upper well-mixed epilimnion waters remain near 100)saturation, but the concentration declines
due to the increase in water temperature and its influence on solubility. Below the epilimnion, DO is
progressively depleted as a result of microbial metabolism and animal respiratory processes, with the
rates of depletion being somewhat faster at or on the thermocline and near the lake bottom (lower
hypolimnion).This forms a vertical oxygen profile that is termed a negative heterograde oxygen curve
(NHOC), also commonly called a "metalimnetic oxygen minimum" (Figure 3-3).The NHOCs are
characterized by a vertical oxygen profile with a pronounced middle water layer(metalimnion)of low
DO positioned between upper(epilimnion) and lower(hypolimnion) zones of higher oxygen content
(Cole and Hannan 1990; Horne and Goldman 1994).The factors influencing the temporal and spatial
pattern of the NHOC and the DO regime in Lake Norman have been discussed in detail in prior reports
(Duke Energy 2011, 2014, 2019). DO continues to decline below the thermocline throughout the
summer until a state of anoxia exists for most of the metalimnion and hypolimnion.As documented by
Rice,et al (2013) and others, this DO squeeze is not uncommon in reservoirs-with and without a
thermal discharge-and can result in fish kills, as observed in Lake Norman in some years(Duke Energy
2018b). Cooling, mixing, and reoxygenation of the water column typically begins in mid-September,
concurrent with declining air temperatures, and generally continues into early winter, reaching
maximum cooling and reoxygenation in February.
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During 2014-2020, surface DO measurements in Zones C and D were comparable to historical data
(Appendix C). Low surface DO values below the NC freshwater aquatic life criteria instantaneous
minimum of 4.0 mg/L occurred in Zone C nearest to the MSS thermal discharge during the summer 2016
(3.8 mg/L).A second low value (4.6 mg/L)occurring in the MSS discharge canal was observed in 2017 as
shown in Figure 3-2a. Water discharged into this canal originates from the hypolimnion of Lake
Norman, which travels under a skimmer wall into the station's intake canal. As previously mentioned,
hypolimnetic water in Lake Norman near MSS becomes hypoxic during the summer months.
The range and variability of surface DO concentrations in the lake were largely driven by water
temperature(because of the direct effect on the solubility of oxygen in water)and biological activity
(photosynthetic release of oxygen by phytoplankton).Cooler water temperatures during the winter
resulted in the highest DO levels observed throughout the lake (Figures 3-2a and 3-2b).Overall, DO
concentrations throughout Lake Norman provided sufficient habitat to support BIC.
Locations
159
012 3 II 13 15 1 02 69 7260 tx 8 If .3 15 s 82 ffi 7280 7 2 2 1 +6 4 82
a
30
35
0
5
10
_ 0
_ a 2
E r
4
- 6
— 8
0 10
5 12
s
a
1Apr F
35
5
0
20
pr or pr
25
3J
3s
io z^ m a io 20 30 w +5 m 39 b 10 io 3o w
Distance from dam (km)
Figure 3-2a. Dissolved oxygen contour plots of Lake Norman main channel locations during February,May,
August,and November(left to right)in the 2014-2017(top to bottom)portion of the study period.All
concentrations are in mg/L.Locations 13 and 15 are in Zone C,and locations 15.9 and 62 are in Zone D. Locations
69,72,and 80 are in the riverine section above Zone D.
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CWA§316(a)Balanced and Indigenous Community Study Report(2014-2020)
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Locations
01 75 8 11 11.5 13 15 153 82 1 7.58 11 11513 15 159 52 1 75 8 11 11.513 15 159 82 1 75 8 11 11.513 15 15.9 82
10
15
20
2`.
30
3E.
0
CL
L w
p zo 0
25
2
® 4
35
0 - +0 20 <_ 30 111111 6
5 - 8
10
15 JP - 12
No Data
25
30
35
5 10 15 20 25 30 5 10 15 20 25 30 5 10 15 20 25 30
Distance from dam (km)
Figure 3-2b. Dissolved oxygen contour plots of Lake Norman main channel locations during February,May,
August,and November(left to right)in the 2018-2020(top to bottom)portion of the study period.All
concentrations are in mg/L. Locations 11.5,13,and 15 are in Zone C,and locations 15.9 and 62 are in Zone D.
The temporal and spatial variability of pH in southeastern reservoirs is often correlated with lake
productivity. During 2014-2020 surface pH averaged 7.3 (range 6.9-8.3)and 7.6(range 6.9-9.0) in
Zones C and D, respectively(Table 3-1). The higher values were recorded at some of the farthest
upstream sampling sites where productivity was higher as a result of watershed inputs.At these sites,
conditions were more favorable for phytoplankton growth which led to the higher pH values during
periods of photosynthesis.Values of pH in Zones C and D (and lakewide)were supportive of a balanced
and indigenous community in Lake Norman.
Specific conductance in Zones C and D and throughout Lake Norman was low, ranging from 45 to 73
µS/cm (Table 3-1)throughout the lake. Low specific conductance indicated low ionic concentrations
and little impact from wastewater sources potentially affecting the BIC. During 2014-2020, specific
conductivity measurements were within, or occasionally below,the historical range in each zone
during each season (Appendix C).
3.1.2 Water Chemistry
The major cations monitored in Lake Norman during 2014-2020 were calcium and magnesium, along
with sodium and potassium prior to 2018. Major anions monitored were chloride and sulfate. During the
study period,sodium, magnesium, potassium, chloride and sulfate were each consistent across zones
and seasons,whereas calcium concentrations were higher in spring than other seasons(Table 3-2).This
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seasonal variability of calcium concentrations is common due to its high reactivity.Although calcium and
sodium concentrations were below the historical median, and magnesium concentrations were above
the median, cation and anion concentrations during the study period were similar to the historical
ranges for Lake Norman.These ion concentrations were not indicative of conditions that may compound
negative thermal effects on a BIC and were within the range necessary for supporting phytoplankton
function.
Hardness concentrations(presence of calcium and magnesium ions),when elevated, can be an indicator
of pollution in Lake Norman and can also reduce bioavailability of toxic metals in aquatic species.
Overall, hardness concentrations were low throughout the lake and were within the historical ranges in
each zone of Lake Norman during each season in 2014-2020. Historically,these concentrations have not
varied seasonally or spatially, but hardness concentrations were higher in Lake Norman during 2008-
2016, likely a result of new scrubber stacks at MSS that began operating in 2007. Despite the rise in
hardness concentrations, surface water hardness in Lake Norman has remained low(<20 mg/L;Table 3-
2;Appendix C).As discussed in the next paragraph, metals concentrations were also low in the Lake.
There is no evidence that hardness has adversely impacted the aquatic community.
During 2014-2020,total and dissolved metals(copper and zinc) were typically within historical 1990-
2013 ranges(Appendix C). Occasional exceptions for copper were observed both in Zone C and further
downlake, and occasional exceptions for zinc occurred lake-wide.Overall,the majority of copper values
were below the historical median for Zone C, and Zone D.Although the hardness-based NC aquatic life
criteria for dissolved copper was low for Lake Norman during the study period (2.0-2.7 µg/L chronic and
1.6-2.1 µg/L acute)spatial effects of elevated copper concentrations were not evident.Total and
dissolved zinc concentrations were generally below laboratory reporting limits during the study period
(Table 3-2). Winter and spring 2018 data were excluded from data analysis due to suspected sample
contamination (evidenced by associated QA sample contamination).Trace metals concentrations during
the 2014-2020 study period, or those reported in previous years, have shown no indication of adverse
impact on a BIC in Lake Norman.
Historical median turbidity values in Lake Norman were low across all seasons with little difference year
to year.Within-season variability was higher in winter and spring than summer and fall when the
growing season helps to buffer the effects of overland runoff during rain events. Spatially,turbidity
measurements were lower downlake than in Zones C and D where flow velocities and effects from
inflows(e.g., sediments, productivity,detritus) are higher. Seasonal turbidity values during the study
period were within historical ranges, including the above-average values recorded throughout the upper
half of the lake during February 2020(27 to 36 NTU).Apart from this storm-induced turbidity in early
2020, Lake Norman turbidity measurements during the study period allow for adequate light
penetration in the lake for supporting macrophyte and phytoplankton communities and were within
ranges that would not adversely impact a BIC in Lake Norman. Secchi depth is a visual measure of water
clarity by evaluating light penetration into the water column,therefore the greater the secchi depth,the
greater the water clarity. By the nature of its measurement,secchi depth corresponds to a portion of
the photoactive zone for phytoplankton growth and the corresponding chlorophyll a production.Secchi
depths were shallowest uplake and deepest downlake(Table 3-2).Seasonally, Lake Norman has not
exhibited much variation in secchi depth with all medians between two and three meters. Based on
these depths, Lake Norman was classified as being mesotrophic(TSI 47;Carlson 1977), slightly higher
than the prediction made from the lake's chlorophyll a(discussed further below in this section). During
2014-2020, secchi depths ranged from 0.4 m at uplake location in spring 2016 to 5.4 m at two locations
downlake in winter 2018.These values were either within or higher than the historical ranges.
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' Table 3-2.Summary of surface and bottom water chemistry results in Lake Norman during 2014-2020 monitoring.
NC Water Quality Sample MSS Discharge Canal(n=1) Zone C(n=3) Zone D(n=4) Lake-wide(n=13)
Criteria' Location Mean' Range Mean' Range Mean' Range Mean' Range
Nutrients
Total phosphorus(mg/L) N/A Surface 0.015 <0.05-0.188 0.006 <0.005-0.029 0.007 0.005-0.033 0.010 <0.005-0.045
Bottom - - 0.015 <0.005-0.028 0.023 0.008-0.052 0.012 <0.005-0.052
Orthophosphorus(mg/L) N/A Surface <0.005 <0.005-0.010 <0.005 <0.005-0.085 <0.005 <0.005-<0.005 0.005 <0.005-0.009
Bottom - - <0.005 <0.005-0.007 <0.005 <0.005-0.007 <0.005 <0.005-0.110
Ammonia nitrogen(mg/L) N/A Surface 0.064 <0.020-0.174 0.033 <0.010-0.297 0.033 <0.010-0.120 0.035 <0.010-0.297
Bottom - - <0.100 <0.100-0.232 0.146 <0.020-0.484 0.095 <0.020-0.862
Nitrite+nitrate nitrogen(mg/L) WS:0.01 mg/L Surface 0.238 0.021-0.441 0.151 <0.010-0.432 0.140 <0.010-0.448 0.161 <0.010-0.448
Bottom - - 0.233 0.055-0.392 0.216 <0.010-0.393 0.208 <0.010-0.393
Total Kjeldhal nitrogen(mg/L) N/A Surface 0.27 <0.10-1.10 0.15 <0.10-0.37 0.16 <0.10-0.37 0.17 <0.10-0.52
Bottom - - 0.221 <0.10-0.410 0.26 <0.10-0.54 0.20 <0.10-1.00
Major Ions
Surface 4.49 3.20-6.29 2.67 2.32-5.61 2.70 2.16-4.33 2.96 1.99-5.61
Calcium(mg/L) N/A Bottom - - 3.82 2.85-4.72 4.01 2.97-5.95 3.69 1.85-5.95
Surface 2.09 1.56-2.82 1.74 1.26-2.30 1.74 1.19-1.95 1.72 1.15-2.30
Magnesium(mg/L) N/A Bottom - - 1.67 1.29-2.02 1.70 1.28-2.27 1.72 1.16-2.27
Potassium(mg/L) N/A Surface 1.67 1.40-1.86 1.68 1.33-1.79 1.66 1.33-1.79 1.66 1.31-1.90
Bottom - - 1.65 1.34-1.92 1.67 1.37-2.06 1.67 1.30-2.06
Sodium(mg/L) N/A Surface 3.97 2.88-4.78 3.91 2.85-4.60 3.86 2.88-4.99 3.89 2.85-5.22
Bottom - - 3.88 2.84-4.93 3.94 3.06-5.20 3.89 2.84-5.20
Chloride(mg/L) 230 mg/L Surface 6.7 3.5-10.0 5.4 2.5-8.0 5.5 2.3-6.5 5.4 2.3-8.0
Bottom - - 5.0 3.1-6.0 4.9 3.4-7.6 5.1 3.1-7.6
Sulfate(mg/L) WS:250 mg/L Surface 4.2 2.8-6.7 3.6 2.3-4.9 3.5 2.5-4.0 3.4 2.3-8.0
Bottom - - 3.2 2.9-3.8 2.7 0.18-4.1 3.2 0.20-4.1
Physical
Turbidity(NTU) 25 NTU Surface 6.31 1.9-36 1.6 1.2-34 1.7 1.3-32 2.9 <1.0-34
Bottom - - 4.8 1.2-13.0 5.9 1.8-14.0 4.0 1.0-26.0
Secchi depth(m) N/A N/A
Hardness(mg/L) WS:100 mg/L Surface 19.8 15.2-26.6 13.86 12.50-23.50 13.91 11.80-17.85 14.48 11.8-23.5
Bottom - - 16.40 12.88-20.10 17.01 12.69-23.34 16.32 11.78-23.34
Metals
Copper,total(µg/L) N/A Surface 4.48 1.66-10.9 1.28 <1.00-6.67 1.35 <1.00-2.59 1.39 <1.00-6.7
Bottom - - <1.00 <1.00-2.02 <1.00 <1.00-1.55 2.65 <1.00-2.17
A:2.0-2.7 µg/L2/C: Surface 3.05 1.38-7.30 1.17 <1.00-17.9 1.08 <1.00-20.8 1.17 <1.00-20.8
Copper,dissolved(µg/L) 1.6-2.1 µg/L' Bottom - - <1.00 <1.00-1.56 <1.00 <1.00-1.45 <1.00 <1.00-1.67
Surface <5.00 <5.00-16.2 <5.00 <5.00-14.9 5.01 <5.00-23.3 5.00 <5.00-23.3
Zinc,total(µg/L) N/A Bottom - - 2.63 <2.00-5.55 2.68 <2.00-7.01 2.71 <5.00-23.3
Zinc,dissolved(jig/0
21.4-27.5 pg/L'/ Surface <5.00 <5.00 5.56 <5.00-13.20 5.13 <5.00-21.90 5.21 <5.00-21.9
C:4.3-5.5 µg/L' Bottom - - - - - - - -
'NC Aquatic Life Criteria(ALC;2017)water quality standard;water supply(WS)criteria were noted where ALC were not available.
'Mean values were calculated using 4S the reporting limit for the analytical results reported as less than laboratory Reporting Limit(RL).Calculated means below the RL are presented as less than the limit.
'Acute(A)and chronic(C)ALC for these metals are hardness dependent and apply as a function of the parameter's water effect ratio which is set forth in 15A NCAC 02B.0211(NCDEQ 2017).
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3.1.3 Productivity
Total phosphorus and nitrogen ((i.e. ammonia, nitrate-nitrite, and TKN) concentrations in Lake Norman
were low during 2014-2020. Concentrations were similar to historical seasonal ranges observed in all
zones of the lake.Overall,total phosphorus surface concentrations were lowest during summer and
highest during winter.Winter increases in phosphorus were likely attributable to a combination of
phenomena such as the phosphorus released from sediments during late summer hypolimnetic anoxia
being brought to the surface through seasonal destratification (mixing) of the water column, a decrease
in overland buffer outside of growing season,and periods of high runoff. Median concentrations during
all seasons were generally less than 0.01 mg/L. Based on these concentrations, Lake Norman had a
trophic state index(TSI) of 37 for phosphorus and was classified as oligo-mesotrophic(Carlson 1977),
which was slightly lower than the predictions based on the lake's secchi depth and chlorophyll a
concentration. Spatially,total phosphorus decreased from uplake to downlake (Table 3-2) which has
been documented previously in Lake Norman as well as other reservoirs(Duke Energy 2016a, 2020b;
Yurk& Ney 1989).Total phosphorus concentrations higher than the 90th percentile of historical data
were documented three times during 2014-2020, and these were all in the uppermost reaches of the
reservoir. Similar to total phosphorus, orthophosphate was low throughout Lake Norman during 2014-
2020 and historically. During the current study period,only three out of 131 samples for
orthophosphate were greater than the detection limit of 0.005 mg/L.These low concentrations of total
phosphorus and orthophosphate indicate Lake Norman is phosphorus-limited, as is common in
freshwater lakes(USEPA 1978; Schindler et al. 2008).
Nitrogen concentrations were low throughout Lake Norman during 2014-2020 (Table 3-2).
Concentrations were similar to historical seasonal ranges observed in all zones of the lake.Seasonally,
TKN concentrations were similar during all times of year, whereas ammonia concentrations were higher
during fall and nitrate-nitrite nitrogen was higher during winter and spring. Higher ammonia
concentrations were likely due to decomposition of organic materials such as sediment detritus,
phytoplankton, and riparian inputs(e.g., leaf litter) at the end of the growing season. The seasonally
higher nitrate-nitrite nitrogen concentrations may be a result of oxidation of ammonia to nitrite and
nitrite to nitrate.Although nitrogen concentrations were low,the ratio of nitrogen to phosphorus was
high (68:1 lake-wide summer average, and 102:1 lake-wide multi-season average),further evidence that
Lake Norman was phosphorus-limited. Nutrient conditions in the lake allow for edible phytoplankton
communities(rather than nitrogen-fixing blue-green algae) and are supportive of BIC.
Chlorophyll a concentrations were compared to historical data from each zone and lake-wide.
Individual concentrations for Zone C and Zone D ranged from<2.0 µg/L to 11.9 µg/L and<2.0 µg/L to
28.9 µg/L, respectively(Table 3-3).The peak concentrations in Zone C occurred during summer 2018
and Zone D occurred during Fall 2018. In general,chlorophyll a concentrations increased from
downlake to uplake. Overall, chlorophyll a concentrations in Lake Norman were low, providing a TSI
of 43 indicated Lake Norman was an oligo-mesotrophic reservoir(TSI 43; Carlson 1977).Combining
chlorophyll a, secchi depth, and total phosphorus data suggested that Lake Norman was overall oligo-
mesotrophic and generally phosphorus-limited (Carlson 1991).
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Table 3-3.Summary of chlorophyll a concentrations(µg/L)in samples from Lake Norman during 2014-2020 by
season.
MSS Discharge Canal(n=1) Zone C(n=3) Zone D(n=4) Lake-wide(n=13)
Mean Range Mean Range Mean Range Mean Range
2014-2017 - - 4.7 2.9-7.6 7.7 2.6-11.4 3.6 <2.0-11.4
Winter
2018-2020 3.9 2.9-5.8 5.8 <2.0-7.9 6.9 2.1-13.9 4.9 <2.0-13.9
2014-2017 - - 5.0 2.5-6.5 6.1 3.6-8.6 3.7 <2.0-8.6
Spring
2018-2020 <2.0 <2.0-<2.0 3.0 <2.0-5.3 5.2 <2.0-12.0 2.9 <2.0-12.0
2014-2017 - - 6.5 2.2-9.5 12.2 8.2-16.0 6.0 2.2-16.0
Summer
2018-2020 3.5 <2.0-6.6 7.0 2.9-11.9 10.0 2.5-25.1 7.2 <2.0-25.1
2014-2017 - - 4.6 3.1-6.1 5.2 <2.0-9.3 3.4 <2.0-9.3
Fall
2018-20191 9.1 9.1 6.6 2.9-10.2 16.8 7.2-28.9 7.6 <2.0-28.9
'Fall 2019 samples inadvertently not collected for chlorophyll a analysis;study period ended prior to Fall 2020.
Seasonally, chlorophyll a concentrations were generally lowest in the spring and highest in the summer
(Table 3-3 and Appendix C). Chlorophyll a concentrations during the summer were above ranges of
those reported in previous years throughout the lake (Appendix C) and during the spring and fall in the
upper portions of the reservoir(Zone D).Additionally, samples within Zone C were below the 90th
percentile of all samples collected since 1990;whereas some samples collected in Zone D, upstream of
influence from all Duke Energy facilities, were above the 90th percentile for the spring,summer and fall.
Flow in the riverine zone of a reservoir like Lake Norman is subject to wide fluctuations,which depend
ultimately on meteorological conditions (Thornton et al. 1990),though influences may be moderated by
upstream dams such as at Lookout Shoals. During periods of high flow, algal production and standing
crop are suppressed due in large part to washout. Conversely, periods of low flow result in higher
retention time which leads to increased production and standing crop. However, over long periods of
low flow, production and standing crop gradually decline.These conditions result in the comparatively
high variability in lake-wide chlorophyll a concentrations during 2014-2020 (Appendix C).
Additionally, we observed no trend in chlorophyll a concentration between zones C and D that would
suggest impacts from operations at MSS. All samples collected since 1990 had concentrations
considered suitable for aquatic life use in North Carolina (<40 µg/L, NCDWR 2019).
3.2 Planktonic Community
Phytoplankton and zooplankton samples have been collected from Lake Norman for over three
decades, and no impacts from the MSS thermal discharge have been observed. Plankton data
collected during the first four years of the study period, and historically, have been previously
reported through the annual Lake Norman maintenance monitoring program for MNS(Duke Energy
2016a, 2016b, 2018a, 2018b). Given the lack of observed impacts,the high variability in densities
among samples,the low productivity of Lake Norman (generally classified as oligotrophic), and the
fact that phytoplankton and zooplankton do not provide unique data to inform about the biological
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health of the lake, annual sampling of these trophic levels was discontinued beginning in 2018,with
exception of continuing sampling and analysis for chlorophyll a(Duke Energy 2019).
3.3 Habitat Formers
Vegetation surveys were conducted in 2018, 2019 and 2020 to evaluate the presence of habitat formers
in Lake Norman.The aquatic macrophytes chara Chara sp. and spikerush Eleocharis baldwinii were the
dominant native species identified during these surveys,followed by lesser occurrences of slender
pondweed Potamogeton pusillus, southern naiad Najas guadalupensis, and eel grass Vallisneria
Americana).These species were distributed throughout the lake. Chara and spikerush were the only
submersed and emergent species (respectively)found in Lake Norman Zone C and Zone D (NCSU 2018,
2019, 2020). Chara provides several ecosystem services to the Lake Norman fish and wildlife community
including shoreline and substrate stabilization,valuable cover for fish and other aquatic animals, and
food source for waterfowl and for fish through harboring smaller aquatic life.Spikerush provides
desirable nesting and cover habitat as well.
Habitats formed by aquatic macrophytes were most common in or near the various tributary arms of
the lake primarily the Ramsey Creek arm in Zone A, Davidson Creek arm in Zone B, and Little Mountain
Creek arm in Zones C and D. During the 2018 survey,the non-native invasive species hydrilla Hydrilla
verticillata was found at 126 of the survey locations(totaling 260 ha) all in the lower lake (Zone A and
Zone B)and mostly in the Ramsey Creek arm (NSCSU 2018). In response to the spreading of hydrilla,
sterile Grass Carp Ctenopharyngodon idella were stocked into the Ramsey Creek arm as a control
measure in 2018. Grass carp, in combination with initial herbicide application, proved to be an effective
management plan for controlling the invasive species in Lake Norman dating back to the early 2000's
(Manuel et al. 2013).The results of the 2019 survey showed a 98 percent reduction in hydrilla after just
one year of restocking the sterile Grass carp(NCSU 2019) and remained sparse through 2020(NCSU
2020).Ongoing management will allow for adaptive changes as necessary to continue to control the
hydrilla while maintaining desired eel grass populations (NCSU 2019). Eel grass can provide a valuable
submersed aquatic habitat,that together with the other macrophytes will continue to provide suitable
habitat for supporting BIC in Lake Norman.
3.4 Benthic Macroinvertebrate Community
In the past(1970's to 2013), benthic macroinvertebrates were sampled at four locations in proximity to
MSS and its associated thermal discharge on Lake Norman. Macroinvertebrate data exhibited high
variability,which was attributed to the lack of diverse substrates throughout the study area (Duke
Energy 2014).Although a BIC of benthic macroinvertebrates was demonstrated in the Lake Norman
study area, no consistent pattern in the density or diversity of the benthic community associated with
MSS thermal discharge was discernable (Duke Power Company 1975, 1987, 1994; Duke Power 1999,
2004a; Duke Energy 2009, 2014).There are currently no indices or other standard for comparison of
macroinvertebrates sampling on piedmont reservoirs, limiting conclusions that can be drawn from
macroinvertebrate data. Nonetheless, by association through trophic levels,the BIC of fish that has been
demonstrated in Lake Norman, including in the MSS thermally influenced Zone C, is indication of there
being no appreciable harm from the thermal discharge on the macroinvertebrate community.
A review of the USFWS IPaC tool for Lake Norman and the area surrounding MSS to determine the
potential presence of federally listed species resulted in the identification of one aquatic
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macroinvertebrate species.The Carolina Heelsplitter Lasmigona decorata was identified with the
potential to occur near MSS based on the database county search. However,this species is not likely to
be found and has not been documented in the Lake Norman area as its habitat is associated with lotic
environments and not the lentic environment of reservoirs(USFWS 2020).The nearest known
population of Carolina Heelsplitter and critical habitat designated by the USFWS(2020) is located over
50 miles downstream from Lake Norman and upstream migration is inhibited by multiple dams.
3.5 Fish Community
3.5.1 Spring Electrofishing Survey
The spring 2014-2020 electrofishing surveys were conducted at mean water temperatures of 17.7°C
(Zone C), 17.6°C(Zone D), and 18.0°C(Lake-wide). Dissolved oxygen, conductivity, and pH were
similar among zones and were within ranges that would support fish assemblages typical of a
piedmont reservoir(Table 3-4).The spring 2014-2020 electrofishing surveys resulted in the collection
of 21,620 individuals(28 individual species and two centrarchid hybrid complexes;Table 3-5)with a
total weight of 1,650.7 kg. Bluegill was the most abundant species, and Alabama Bass had the highest
total biomass of any species. In Zone C,6,315 individuals(22 individual species and two centrarchid
hybrid complexes)were collected, and 5,540 individuals(23 individual species and two centrarchid
hybrid complexes)were collected in Zone D.Total fish biomass collected during 2014-2020 was 450.9
kg in Zone C and 667.0 kg in Zone D (Table 3-5).A full list of the species of fish caught in Lake Norman
and their associated tolerance ratings and trophic guilds is depicted in Appendix D.
Table 3-4. Mean(and range)of water quality parameters for each zone(C and D)and lake-wide in Lake Norman
during spring 2014-2020 electrofishing.
Parameter Zone C Zone D Lake-wide
Temperature(°C) 17.7(12.9-22.4) 17.6(14.0-21.8) 18.0(12.9-24.5)
Dissolved Oxygen(mg/L) 10.1(8.1-12.3) 9.9(6.6-12.7) 9.8(6.5-12.7)
Conductivity(µS/cm) 65(44-124) 60(44-111) 61(44-154)
pH 7.5(6.8-8.0) 7.6(6.9-8.1) 7.5(6.8-8.1)
Table 3-5. Number(No.)and biomass(kg)of fish collected from electrofishing within two zones(C and D)and all
of Lake Norman during spring 2014-2020.
Zone C Zone D Lake-wide
Species Origin No. Kg No. Kg No. Kg
Catostomidae
Quillback Native 2 3.22
Shorthead Redhorse Native 1 0.88 1 0.88
Centrarchidae
Alabama Bass Introduced 709 137.71 763 185.38 2,261 518.22
Black Crappie Native 15 5.24 102 36.30 134 49.39
Bluegill Native 3,235 49.89 2,797 58.33 10,508 168.48
Green Sunfish Introduced 451 8.86 494 13.59 2,065 38.78
Hybrid black bass Hybrid 3 2.28 4 1.68 11 5.57
Hybrid sunfish Hybrid 296 5.78 28 1.30 524 14.43
Largemouth Bass Native 70 49.50 119 77.45 270 175.04
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Redbreast Sunfish Native 797 22.45 309 6.56 2,695 59.86
Redear Sunfish Native 107 13.05 182 34.06 1,375 87.93
1 Warmouth Native 56 0.60 22 0.31 156 1.84
Clupeidae
Alewife Introduced 144 1.22
Gizzard Shad Native 49 21.76 213 95.87 303 138.65
Threadfin Shad Introduced 429 1.93 366 2.99 841 5.01
Cyprinidae
Common Carp Introduced 23 87.72 28 101.39 63 225.96
Golden Shiner Native 3 0.01 1 <0.01 5 0.01
Grass Carp Introduced 2 9.50 3 14.50
Greenfin Shiner Native 4 0.01 22 0.06 27 0.08
Spottail Shiner Native 12 0.10 1 <0.01 20 0.15
Whitefin Shiner Native 1 <0.01 4 0.01 7 0.03
Ictaluridae
Blue Catfish Introduced 3 13.61 2 21.68 7 47.59
Channel Catfish Introduced 15 11.12 29 18.29 68 52.44
Flathead Catfish Introduced 26 7.31 22 3.34 82 27.86
Lepisosteidae
Longnose Gar Native 4 4.69 6 8.28
Moronidae
Striped Bass Introduced 1 1.32 1 1.32
White Perch Introduced 7 1.19 14 2.47 21 3.67
Percidae
Fantail Darter Native 1 <0.01
Tessellated Darter Native 1 <0.01 1 <0.01 7 0.01
Yellow Perch Native 12 0.32 12 0.32
Total 6,315 450.94 5,540 666.97 21,620 1,650.72
Number of taxa 24 25 30
The mean CPUE of fish by number was similar between Zone C and Zone D during 2014-2020(Figure 3-
3).The mean CPUE of fish by weight was generally higher in Zone D than in Zone C(Figure 3-3), however
this pattern of higher fish biomass uplake in reservoirs is common. Spatial heterogeneity of higher fish
biomass uplake is related to natural reservoir dynamics where higher levels of nutrients and water
circulation occur uplake,thereby resulting in higher productivity(Siler et al. 1986;Yurk and Ney 1989;
Bettoli et al. 1993;Sanches et al. 2016).Spatial heterogeneity is further evident by higher
concentrations of chlorophyll, phytoplankton standing crops, and zooplankton densities in uplake
compared to downlake portions of Lake Norman.Additionally,the interannual CPUE in each zone
followed a similar pattern to the lake-wide CPUE during this period, suggesting no localized effects
related to MSS operations(Figure 3-3).Overall, CPUE data since 2000 indicated no trend in the relative
abundance or biomass of the overall fish community(Figure 3-3).
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1500 -
-0—Zone C
- Zone D
- Lake-wide
1200-
L
900 -
T
� L -
a :::
- _- — — — 1
0 , , , , , , , , , , , , , , , p •
2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020
140-
—0—Zone C
120 - —0—Zone D
—191— Lake-wide
100 - —
co 80
W — I
a_ 60- — —
U
I• 1 I i!
:: j
1110111
I � I7
I�' 1
` ��
0 I • • • I • I 1 • I
2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020
Figure 3-3.Mean catch rate(CPUE)by number(top panel)and by weight(bottom panel)of all species collected
within two zones and lake-wide from electrofishing in Lake Norman during spring 2000 and 2003-2020. Error
bars are 90%confidence intervals.
The percentages of fish species with different pollution tolerance classifications were similar between
zones and within all of Lake Norman during 2014-2020(Table 3-6). Difference in proportions between
Zone C and Zone D were primarily related to lower Redbreast Sunfish, classified as"tolerant", catch in
Zone D. Previous studies have shown a decreasing relative abundance of Redbreast Sunfish from
downlake to uplake in Lake Norman, and this trend has not been attributed to MSS thermal discharge
(Duke Energy 2020a). Like the pollution tolerance proportions,the trophic guild proportions were
similar between zones and within all of Lake Norman during 2014-2020(Table 3-6). Differences in
proportions between Zone C and Zone D were again related to the reduced catch of Redbreast Sunfish,
an insectivore, in Zone D. Overall, multiple trophic guilds were represented in each zone of Lake Norman
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in proportions that would be expected in a piedmont reservoir.Additionally,the percent of sunfish and
black bass that were identified as hybrids was low(Table 3-6). Of the hybrid sunfish caught in Zone C,
roughly half were captured in 2015. No more than 3%of sunfish captured in Zone C were identified as
hybrids in any of the other years of the current study period (Duke Energy 2016a, 2018a, 2018b, 2020b).
These data suggest the abundance of hybrid sunfish in 2015 was anomalous, and high hybridization
rates were not a persistent issue in this part of Lake Norman.
Table 3-6.Percent pollution tolerance,trophic guild,and percent of hybrids for fish collected from electrofishing
within two zones and lake-wide in Lake Norman during spring 2014-2020. Percent hybrids are specific to only
that taxa of fish(e.g.,percent of sunfish in a zone that was classified as a hybrid).
Category Zone C Zone D Lake-wide
Tolerance rating
Tolerant 20.2 15.1 22.4
Intermediate 63.8 70.6 64.7
Not defined 16.0 14.4 12.9
Trophic levels
Piscivore 13.2 18.8 13.0
Insectivore 78.4 69.7 81.0
Omnivore 8.4 11.5 6.0
Herbivore <0.1 0.0 <0.1
Percent hybrids
Sunfish 6.0 0.7 3.0
Black bass 0.4 0.5 0.4
All four species of RIS (Largemouth Bass,Alabama Bass, Bluegill, and Redbreast Sunfish) were
collected in all zones of Lake Norman during 2014-2020. During the current study period,the mean
CPUE of stock size and larger Largemouth Bass(>200 mm) ranged from 2.1/hr in Zone C in 2019 to
11.7/hr in Zone D in 2015, and the mean CPUE of stock size and larger Alabama Bass(>-180 mm)
ranged from 13.0/hr in Zone C in 2014 to 51.5/hr in Zone C in 2018(Figure 3-4).Alabama Bass, which
likely arrived from angler introductions, were first collected in Lake Norman in the early 2000s.The
relative abundance of Alabama Bass throughout Lake Norman increased through 2010 and has
remained stable since that time (Figure 3-4). In that same time frame,the mean CPUE of Largemouth
Bass declined by over 95%, although it has remained stable since Alabama Bass became fully
established (Figure 3-4).Though the Largemouth Bass decline in recent years is likely due to
congeneric competition from introduced Alabama Bass (Sammons and Bettoli 1999; Long and Fisher
2000; Pope et al. 2005), other introduced species (e.g.,Alewife and White Perch) may have also
contributed to these declines.
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50 -
40 - - Zone C
—ZoneD
—iv— Lake-wide
—
a) 30 - —
E
c
0 20 - —
d — —
U
lie.. 9411
2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020
70 -
f Zone C
60 - Zone D _
-v- Lake-wide
50 -
-0 40 -
el
W 30 -
d - —
U
20 - i _ II
10 -
2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020
Figure 3-4. Mean catch rate(CPUE)by number of stock size and larger Largemouth Bass(200 mm;top panel)and
Alabama Bass(180 mm;bottom panel)collected within two zones and lake-wide from electrofishing in Lake
Norman during spring 2000 and 2003-2020.Error bars are 90%confidence intervals.
During 2014-2020,the mean CPUE of stock size (80 mm) and larger Bluegill ranged from 56.9/hr in
Zone C in 2017 to 167.6/hr in Zone C in 2015 (Figure 3-5). During that span,the mean CPUE of stock
size (80 mm)and larger Redbreast Sunfish ranged from 6.2/hr in Zone D in 2015 to 83.4/hr in Zone C
in 2018(Figure 3-5). Bluegill CPUE was consistent across years and between zones during the current
study period, whereas Redbreast Sunfish exhibited some variability. Zone D had lower relative
abundance of Redbreast Sunfish than other parts of the lake.This pattern of lower CPUE in the upper
32

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portions of the reservoir has also been documented in Lake Wylie(Duke Energy 2020a).Additionally,
the CPUE of Redbreast Sunfish increased during 2018-2020 compared to previous years.This change
was related to the habitats sampled at the new electrofishing transects(which were selected to be
more representative of Lake Norman as a whole) being more suitable for the species. Overall trends in
RIS CPUE among zones and over time suggested no discernable impact to the abundance of these
populations related to the thermal discharge from MSS.
250 -
- 0- Zone C
Zone D
200 - -V- Lake-wide
s
150 -
a
50 - - - -
0
140 - 2014 2016 2018 2020
120 - ♦- Zone C
-0--Zone D
-v- Lake-wide
100 -
80 -
E —
7
C —
? 60 - - -
a
U
40 - ' --
20
41111111
0
2014 2016 2018 2020
Figure 3-5.Mean catch rate(CPUE)by number of stock size(80 mm)a greater Bluegill(top panel)and Redbreast
Sunfish(bottom panel)collected within two zones and lake-wide from electrofishing in Lake Norman during
spring 2014-2020.Error bars are 90%confidence intervals.
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Length frequency analyses indicated multiple age-classes of all four RIS in all zones of Lake Norman
during spring electrofishing 2014-2020. However,the size structures of all four species were skewed
away from the average for the eco-region (Brouder et al. 2009).The size structures for Largemouth Bass
and Alabama Bass were skewed toward larger individuals.This comparison only looks at stock size and
larger individuals and does not consider the large number of small Alabama Bass caught during the
study period.These smallest fish represented the youngest available age class available(i.e., age-1
during spring electrofishing)for both species, an indication of spawning and recruitment to age-1.
However, a disproportionately low number of bass were captured between 150 and 300 mm (Figure 3-
6). Individuals of these intermediate sizes are those that would grow and recruit to larger sizes in future
years.The skewed size structures of black bass in Lake Norman may be indicative of low mortality or low
prey abundance limiting growth of larger individuals, but overall these populations were sustainable.
Additionally,the patterns in size structure were similar between Zone C and Zone D as well as lake-wide.
Unlike black bass,the size structures for Bluegill and Redbreast Sunfish were skewed toward smaller
individuals compared to the average for the eco-region (Brouder et al. 2009; Figure 3-7).The skew
towards smaller individuals may have been indicative of high mortality(e.g., predation), but intra-and
interspecific competition leading to density dependent growth was a more likely cause.The CPUE of
Bluegill in Lake Norman was greater than the 50th percentile for the eco-region (Brouder et al. 2009),
despite the low productivity of the lake.The combination of predator size structure (Largemouth Bass
and Alabama Bass) and prey size structure (Bluegill and Redbreast Sunfish) suggested these populations
may have naturally reached a "big bass" equilibrium (Willis et al. 1993). Overall,the patterns
documented in length-frequency and CPUE between zones for all four RIS indicated the presence of
multiple age classes including both age-1 fish and the largest mature individuals. No differences were
observed that appeared to be related to operations of MSS.
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18 35-
16
14 Zone C,n=70 30- Zone C.n=505
2 25
10 20-
8 15-
6
10
4
2 5"
0 p
18 35-
16
c 14 Zone D.n=119 30-
o C MN Zone D n=482
0 0o25-
12 N
E 10 E zo-
o
8 a 15-
C
6 v
U
45 N 10-
o_ 4 a
2 5-
0 0
18 35
16
14
Lake-wide,n=270 30 I♦Lake-wide.n=1.776
2 25
10 20
8 15
6
10
4
2 5
0 0
50 100 150 200 250 300 350 400 450 500 550 50 100 150 200 250 300 350 400 450 500
Total length(mm) Total length(mm)
Figure 3-6. Length-frequency of Largemouth Bass(left panels)and Alabama Bass(right panels)collected within
two zones and lake-wide from electrofishing in Lake Norman during spring 2014-2020.
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20 badhilib
25
15 Zone C,n=3,235 20 NM Zone C,n=797
15
10
10
5
s
0
20 25
Zone D,n=2,793
0 15 c 20 Zone D,n=309
o
N F
O �
E 15
8 10 8
E10
d 5
o-
s
0 0
20 25
Mi Lake-wide,n=10,504 20 MN Lake-wide,n=2,695
15
15
10
10
5
5
0 0
20 40 60 80 100 120 140 160 180 200 220 40 60 80 100 120 140 160 180 200 220
Total length(mm) Total length(mm)
Figure 3-7. Length-frequency of Bluegill(left panels)and Redbreast Sunfish(right panels)collected within two
zones and lake-wide from electrofishing in Lake Norman during spring 2014-2020.
3.5.2 Fall Electrofishing Survey
The fall 2017-2019 electrofishing surveys were conducted at mean water temperatures of 22.0°C
(Zone C), 19.6°C(Zone D), and 21.7 °C(Lake-wide). Dissolved oxygen, conductivity, and pH were
similar among zones and were within ranges that would support fish assemblages typical of a
piedmont reservoir(Table 3-7).The surveys resulted in the collection of 11,213 individuals(23
individual species and two centrarchid hybrid complexes;Table 3-8)with a total weight of 461.1 kg.
Bluegill were the most abundant species numerically,and Alabama Bass had the highest total biomass
of any species. In Zone C, 2,553 individuals(15 individual species and one centrarchid hybrid complex)
were collected, and 2,713 individuals(16 individual species and two centrarchid hybrid complexes)
were collected in Zone D (Table 3-9).Total fish biomass collected during fall 2017-2019 was 134.9 kg
in Zone C and 158.8 kg in Zone D (Table 3-9).
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Table 3-7.Mean(and range)of water quality parameters for each zone(C and D)and lake-wide in Lake Norman
during fall 2017-2019 electrofishing.
Parameter Zone C Zone D Lake-wide
Temperature(°C) 22.0(18.7-29.0) 19.6(16.9-22.5) 21.7(16.9-29.2)
Dissolved Oxygen(mg/L) 7.4(6.6-8.4) 9.0(6.9-11.0) 8.1(6.6-11.0)
Conductivity(pS/cm) 58(48-68) 52(43-58) 53(43-68)
pH 7.1(6.8-7.6) 7.4(6.8-7.9) 7.2(6.3-7.9)
Table 3-8. Number(No.)and biomass(kg)of fish collected from electrofishing within two zones(C and D)and
lake-wide in Lake Norman during fall 2017-2019.
Zone C Zone D Lake-wide
Species Origin No. Kg No. Kg No. Kg
Catostomidae
Quillback Native 1 1.50 1 1.50
Shorthead Redhorse Native 4 4.21 4 4.21
Centrarchidae
Alabama Bass Introduced 358 35.77 395 33.21 1,298 119.66
Black Crappie Native 4 1.32 3 0.29 8 1.61
Bluegill Native 1,473 22.35 1,625 22.76 5,684 72.98
Green Sunfish Introduced 173 2.63 311 5.39 1,804 18.02
Hybrid black bass Hybrid 1 0.45 3 0.94
Hybrid sunfish Hybrid 33 1.00 6 0.23 125 3.27
Largemouth Bass Native 11 5.62 29 16.20 59 31.07
Redbreast Sunfish Native 336 10.56 124 2.16 1,046 23.31
Redear Sunfish Native 69 7.48 138 22.82 858 50.39
Warmouth Native 32 0.38 12 0.13 122 1.08
Clupeidae
Gizzard Shad Native 36 14.51 36 14.40 93 42.14
Threadfin Shad Introduced 3 0.02
Cyprinidae
Common Carp Introduced 5 19.19 8 30.57 14 50.67
Grass Carp Introduced 1 2.88
Greenfin Shiner Native 1 <0.01 1 <0.01
Spottail Shiner Native 15 0.08
Whitefin Shiner Native 6 0.02
Ictaluridae
Blue Catfish Introduced 1 3.25 2 5.65
Channel Catfish Native 11 8.56 7 5.50 33 29.02
Flathead Catfish Introduced 9 0.82 11 0.39 27 2.54
Percidae
Piedmont Darter Native 1 <0.01 1 <0.01
Yellow Perch Native 4 0.04 4 0.04
Poeciliidae
Eastern Mosquitofish Native 1 <0.01 1 <0.01
Total 2,553 134.93 2,713 158.75 11,213 461.10
Number of taxa 16 18 25
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The standard weight for a species(used in calculating relative weight, Wr) is calculated based on the
75' percentile weight.Therefore,fish with a Wr of 100 would have above average condition (Wege
and Anderson 1978).A Wr around 90 would be considered "average" condition,and Wr values below
80 would be "poor" (Murphy et al. 1990).The condition for Largemouth Bass in Lake Norman during
2017-2019 was average with a mean Wr of 90 (Figure 3-8).The mean Wr of fish captured in Zone C
and Zone D was nearly identical to the lake-wide mean. Lake-wide, mean Wr decreased from
Largemouth Bass in the sub-stock length group (<200 mm; Wr=96)to those in the memorable length
group(510-629 mm; Wr=82; Figure 3-8).This decreasing trend could be indicative of limited prey
availability for the largest individuals. Unlike Largemouth Bass,Alabama Bass Wr in Lake Norman
during the study period was below average.Values were similar between zones and the whole lake,
but mean condition decreased from fish in the sub-stock length class(Wr=90)to those in the
memorable length class(Wr=77; Figure 3-8).This pattern may be indicative of limited food resources
for larger individuals, and when combined with the length-frequency, may suggest this species is
stockpiling in the quality and preferred length classes. Overall, no trends were apparent in Wr values
for either species of black bass that would be attributed to thermal discharge from MSS.
120- 120-
110- 110-
L L
.2, 100- T 2, lot-
90- 90- T
cc 80 _L 1 80
70- 70-
60 60
C D Lake-wide C D Lake-wide
Zone Zone
120- 120-
110- T 110-
,� T T T ' t 100- T T
90- 90- T T
a
80- �- 80- 1 _I T_.
cc
I re
70- 70-
I_
60 60
sc-\LC ,f 1 ^ �� m�^dry ,`�- '0 ,np
5 cs Q 4e 5 oa e
Length group Length group
Figure 3-8. Largemouth Bass(left panels)and Alabama Bass(right panels)condition(relative weight)by zone of
Lake Norman and by length category for fish collected during fall 2014-2019 electrofishing.The horizontal line
represents the median for each zone,the boxes represent the 25'and 75'percentile,and the whiskers show
10th and 90'percentiles.
The mean Wr of Bluegill in Lake Norman during the study period was below average with a mean of
83, and Zones C and D had mean Wr of 81 and 84, respectively(Figure 3-9).The mean Wr of Redbreast
Sunfish in Lake Norman was above average at 92,with mean values of 91 in Zone C and 97 in Zone D
(Figure 3-9).The relative weights calculated for Redbreast Sunfish may have over-estimated condition.
The standard weight equation for this species was created from historical data collected by Duke
Energy and may not contain enough populations to accurately determine parameter values.
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CWA§316(a)Balanced and Indigenous Community Study Report(2014-2020)
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Regardless,this metric does allow a comparison of overall condition between zones of the lake and
among length groups. Like Largemouth Bass,we observed a decreasing mean W,with increasing
length group for Bluegill,whereas Redbreast Sunfish W,was above average for all length groups
(Figure 3-9).Again,this pattern may be related to food limitations for the larger Bluegill. However, no
differences in condition were documented that would indicate impacts due to thermal discharge from
MSS.
120- 120
110 z 110
.v ,00- v 100- T
90' T soI. Min
W 80- II MIMI1 K 80
70- 70-
60 60
C D Lake-wtde C D Lake-wide
Zone Zone
120- 120-
110-
110-
.3 100- rn T
10o- T T
S
eo- T so- No Data
80- T No Data L _L
80-
70- 70-
1
60 60
\� `p ,gyp �� 1' ti
.t- \ \ e\ \ \rye
5`-' ,p•'� O n` d� 6� e
is
Length group Length group
Figure 3-9.Bluegill(left panels)and Redbreast Sunfish(right panels)condition(relative weight)by zone of Lake
Norman and by length category for fish collected during fall 2014-2019 electrofishing.The horizontal line
represents the median for each zone,the boxes represent the 25'and 75'percentile,and the whiskers show
10"and 90'percentiles.
3.6 Other Vertebrate Wildlife
Eleven different taxa of non-fish vertebrate wildlife were observed in the MSS discharge area on Lake
Norman during summer surveys during the study period (Table 3-9).Additional casual observations
made during the seasonal limnological monitoring and fish surveys were consistent with the summer
survey findings. All animals were engaging in natural behaviors that included the use of the thermally-
influenced water in some instances. However, large or unique populations of wildlife (e.g., migrating or
overwintering waterfowl)were not observed.As indicated in the USEPA 1977 Technical Guidance
Document, "most sites in the United States will be considered low potential impact for other vertebrate
wildlife because thermal discharge plumes should not generally impact large or unique populations of
wildlife" unless the thermal discharge encourages the wildlife to overwinter.The sub-tropical climate of
North Carolina provides low potential impact for this behavior.
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A review of the USFWS IPAC tool for Lake Norman and the area surrounding MSS resulted in one
threatened vertebrate species(northern long-eared bat Myotis septentrionalis) (USFWS 2020).This
species is not aquatic and is not dependent on the Lake Norman waterbody for habitat or food source
and therefore would not be directly affected by MSS thermal impacts. No other vertebrate wildlife RIS
species were identified.
Table 3-9. Location,behavior,and number of vertebrate wildlife observed in the MSS discharge area during
summer surveys in 2015-2020.Documented observations were not available for 2014.
Common name Scientific name Location Behavior Number
2015
Canada Goose Branta canadensis Lake/shore Swimming NR
Common Loon Gavia immer Lake Swimming NR
Osprey Pandion haliaetus Lake Soaring NR
2016
Canada Goose Branta canadensis Shore Resting 7
Mallard Anas platyrhynchos Shore Resting Pair
Osprey Pandion haliaetus Lake Flying 1
Great Blue Heron Ardea herodias Shore Flying low 1
Belted Kingfisher Megaceryle alcyon Lake Hunting 1
Raccoon Procyon lotor Shore Tracks -
Beaver Castor canadensis Lake/shore Sign/barkless limbs -
2017
Belted Kingfisher Megaceryle alcyon Lake/shore Foraging 1
Bald Eagle Haliaeetus leucocephalus Lake Flying immature
Beaver Castor canadensis Lake Lodge -
Raccoon Procyon lotor Shore Tracks -
2018
Great Blue Heron Ardea herodias Lake/shore Flying 2
Mallard Anas platyrhynchos Shore Walking/calling 2
2019
Belted Kingfisher Megaceryle alcyon Lake Foraging/calling 1 female
Great Blue Heron Ardea herodias Shore Flying 2
Osprey Pandion haliaetus Lake Flying/calling 1
Mallard Anas platyrhynchos Lake Swimming 6
Killdeer Charadrius vociferus Shore Walking/calling 1
2020
Belted Kingfisher Megaceryle alcyon Lake Foraging/calling 2
Great Blue Heron Ardea herodias Lake/shore Flying 3
Canada Goose Branta canadensis Lake Swimming 24
Mallard Anas platyrhynchos Lake Swimming/loafing 25
Northern Watersnake Nerodia sipedon Lake Swimming 1
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CWA§316(a)Balanced and Indigenous Community Study Report(2014-2020)
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4 Balanced Indigenous Assessment
This assessment demonstrated that current MSS operations will ensure survival, reproduction,
development, and growth of RIS. Lake Norman consisted of a physiochemical environment conducive
to sustaining a BIC. Data from lower trophic levels suggested that primary productivity (indicated by
chlorophyll a)was present at appropriate levels throughout the lake to support a BIC at higher trophic
levels.
This demonstration revealed the Lake Norman fish community was composed mostly of indigenous
species(71% native species) expected from a reservoir located in the North Carolina Piedmont (Fowler
1945; Barwick 2002). During 2014-2020, a range of 15 to 23 distinct species of fish and two hybrid
complexes were collected from the two survey zones during spring and fall electrofishing, and 30
distinct species and two hybrid complexes were collected throughout Lake Norman.The CPUE of fish
during spring 2014-2020 was generally similar to those noted annually since 2000.Species diversity in
the thermally-influenced zone (Zone C) was similar to the associated reference site (Zone D).The fish
community found in the zone of Lake Norman thermally influenced by MSS encompassed multiple
trophic guilds (i.e., insectivores, piscivores, omnivores, and herbivores) supporting a balanced fish
community.Additionally, although fish captured in the thermally-influenced zone had slightly higher
proportion of pollution tolerance to the associated reference zone,the proportion of pollution
tolerance was similar to Lake Norman as a whole, and no zones were dominated by pollution-tolerant
species.Although non-indigenous species such as Alabama Bass and Green Sunfish were abundant in
Zone C,they were caught throughout Lake Norman. Some indigenous species (e.g., Largemouth Bass)
have experienced reduced CPUE compared to historical surveys which may be a result of an altered
fish community related to the introduction of nonnative species(e.g.,Alewife,Alabama Bass, Blue
Catfish lctalurus furcatus, Hybrid Striped Bass Morone saxatilis x Morone chrysops, and White Perch).
Regardless,the catch was dominated by species native to the watershed.The RIS had size structures
in all zones indicative of multiple age classes including both age-1 fish and the largest mature
individuals.The size structures suggested these populations have the capacity to be sustained in all
zones of the lake as lake conditions change throughout the year.
Based on the diversity and numbers of individuals in the littoral fish community during spring sampling
and the condition of RIS collected during fall sampling, Lake Norman supports a balanced and
indigenous fish community. In addition, 11 species of other vertebrate wildlife were identified near
MSS, including reptiles, birds, and mammals. Data collected from all taxonomic levels combined
during this and previous studies have demonstrated that the thermal discharge from MSS is protective
of a BIC in Lake Norman.
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5 References
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Manuel, K. L.,J. P. Kirk, D. H. Barwick,and T.W. Bowen. 2013. Hydrilla management in piedmont
reservoirs using herbicides and triploid grass carp: a case study. North American Journal of
Fisheries Management 33:488-492.
Miranda, L. E. (Steve),and J. Boxrucker. 2009.Warmwater fish in large standing waters. Pages 231-282
in S.A. Bonar,W.A. Hubert, and D.W.Willis,editors. Standard Methods for Sampling North
American Freshwater Fishes.American Fisheries Society, Bethesda, Maryland.
Murphy, B. R., M. L. Brown, and T.A.Springer. 1990. Evaluation of the relative weight(Wr) index,with
new applications to walleye. North American Journal of Fisheries Management 10:85-97.
NCDWR. 2019.Surface water quality standards, criteria, & in-stream target values. NC Department of
Environmental Quality. Winston-Salem, NC.
NCSU. 2018. Lake Norman Vegetation Survey. Raleigh, NC. pp 15.
NCSU. 2019. 2019 Lake Norman Aquatic Vegetation Survey. Raleigh, NC. pp 14.
NCSU. 2020. 2020 Lake Norman Aquatic Vegetation Survey. Raleigh, NC. pp 21.
Pope, K. L., S. R. Denny, C. L. Harthorn, C.J. Chizinski,and K. K. Cunningham. 2005. Food habits of co-
occurring populations of Largemouth Bass and Spotted Bass in two New Mexico reservoirs.
Journal of Freshwater Ecology 20:37-46.
Rice,J. A.,J.S.Thompson,J.A. Sykes, and C.T.Waters. 2013.The role of metalimnetic hypoxia in striped
bass summer kills: consequences and management implications. Pages 121-145 in J.S. Bulak, C.
C. Coutant, and J. A. Rice, editors. Biology and management of inland striped bass and hybrid
striped bass.American Fisheries Society,Symposium 80, Bethesda, Maryland.
Rodriguez, M. S. 1982. Phytoplankton. Pages 154-260 in J. E. Hogan and W. D.Adair, editors. Lake
Norman summary.Technical Report DUKEPWR/82-02. Duke Power Company. Charlotte, NC.
Sammons, S. M., and P.W. Bettoli. 1999.Spatial and temporal variation in electrofishing catch rates of
three species of Black Bass(Micropterus spp.)from Normandy Reservoir,Tennessee. North
American Journal of Fisheries Management 19:454-461.
Sanches, B. O., R. M. Hughes, D. R. Macedoc, M. Castillod and G. B.Santosa. 2016. Spatial variations in
fish assemblage structure in a southeastern Brazilian reservoir.Journal of Limnology 75: 156-
165.
Schindler, D. W., R. E. Hecky, D. L. Findlay, M. P.Stainton, B. R. Parker, M.J. Paterson, K.G. Beaty, M.
Lyng, S. E. M. Kasian. 2008. Eutrophication of lakes cannot be controlled by reducing nitrogen
input: results of a 37-year whole-ecosystem experiment. Proceedings of the National Academy
of Sciences of the United States of America, 105:11254-11258.
Siler,J. R., W.J. Foris, and M. C. Mclnerny. 1986. Spatial heterogeneity in fish parameters within a
reservoir. Pages 122-136 in G. E. Hall and M.J.Van Den Avyle,editors. Fisheries Management:
Strategies for the 80's. Reservoir Committee, Southern Division American Fisheries Society.
Bethesda, MD.
44

CWA§316(a)Balanced and Indigenous Community Study Report(2014-2020)
MARSHALL STEAM STATION
Thornton, K. W., B. L. Kimmel and F. E. Payne, editors. 1990. Reservoir Limnology: Ecological
Perspectives. John Wiley&Sons, Inc. New York, NY.
USEPA. 1977. Interagency 316(a)Technical Guidance Manual and Guide for Thermal Effects Sections of
Nuclear Facilities Environmental Impact Statements. Office of Water Enforcement, Permits
Division, Industrial Permits Branch.Washington, DC.
USEPA. 1978.A Compendium of Lake and Reservoir Data Collected by the National Eutrophication
Survey in Eastern, North-Central, and Southeastern United States. Working Paper No.475.
USFWS. 2020. Endangered Species,Threatened Species, Federal Species of Concern, and Candidate
Species. Mecklenberg County, North Carolina.Asheville Ecological Field Office, NC.
Wege, G.J. and R.O.Anderson. 1978. Relative weight(We):a new index of condition for largemouth
bass. Pages 79-91 in G. D. Novinger and J.G. Dillard,editors. New Approaches to the
Management of Small Impoundments.American Fisheries Society, North Central Division,
Special Publication 5, Bethesda, Maryland.
Wetzel, R.G. 2001. Limnology: lake and river ecosystems,third edition.Academic Press. San Diego,
California.
Willis, D.W., B. R. Murphy, and C. S. Guy. 1993.Stock density indices: development, use, and limitations.
Reviews in Fisheries Science 1:203-222.
Yurk,J.J. and J.J. Ney. 1989. Phosphorus-fish community biomass relationships in southern Appalachian
reservoirs: can lakes be too clean for fish? Lake and Reservoir Management 5:89-90.
45

Appendices
46

Appendix A
A-1

ROY COOPER
Governor
MICHAEL S.REGAN
Secretary
Water Resources LINDA CULPEPPER
Environmental Quality Director
March 15,2018
Rick Roper
Duke Energy,Marshall Steam Station
8320 East Hwy 150
Terrell,NC 28682
Subject:Review of Duke Energy Marshall Steam station 2018 Lake Norman 316(a)Study Plan
(NC0004987).
Dear Mr.Roper
Thank you for the submission of the 2018 316(a)Study Plan for this facility.We have reviewed this
document and note no concerns regarding the plan.
If you have any questions,please do not hesitate to contact me.
Sincerely,
in
Cyndi Karoly
Chief,Water Sciences Section
Cc: Corey Basinger,Mooresville Regional Office
Julie Grzyb,NCDWR Complex Permitting Unit
•--="'Nothing Compares'.
State of North Carolina I Environmental Quality/Water Sciences Section
1621 Mail Service Center I Raleigh,North Carolina 27699-1621
919-743-8400
A-2

ebi.,DUKE Marshall Steam Station
Duke Energy
ENERGY- 8320 East Hwy.150
Terrell NC 28682
CAROLINAS
March 5, 2018
NC DEQ, Division of Water Resources NC DEQ
WQ Permitting Section—NPDES Water Sciences Section
1617 Mail Service Center 1621 Mail Service Center
Raleigh, NC 27699-1617 Raleigh, NC 27699-1621
Attn: Sergei Chernikov Attn:Cyndi Karoly
Subject: Duke Energy Marshall Steam Station, NPDES Permit NC0004987
2018 Lake Norman 316(a)Study Plan
Dear Sir or Madam:
The purpose of this letter is to transmit a copy of the 2018 Lake Norman 316(a)Study Plan to
the North Carolina Department of Environmental Quality(NC DEQ)as required in Section A.
(26)of the Marshall Steam Station NPDES Permit NC0004987. The 2018 Study Plan,originally
submitted to NC DEQ in October 2017 for the McGuire Nuclear Station NPDES Permit
NC0024392, has been reviewed and approved as per NC DEQ response letter dated November
10, 2017 indicating no objections to its contents. This is a lakewide study plan that will be used
to also assess thermal effects of Marshall Steam Station.
We look forward to your review and approval of the 2018 Study Plan for Marshall Steam
Station/Lake Norman in accordance with the requirements of the NPDES Permit. We will
continue to work with you and your teams as the studies progress. If you have questions please
feel free to contact either Scott La Sala at 828-478-7820,via email at joseph.lasalaC@duke-
energy.com or Julie Stahl at 980-875-3834,via email at [e-mail].
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.
Sin rely,
. r Q®�-
Rick Roper
Marshall Steam Station,Station Manager
General Manager III
FHO-Carolinas Coal
attachments
BUILDING A SMARTER ENERGY FIORE' www.dukeenergy.com
A-3

Marshall Steam Station
Duke Energy
8320 Easl Hwy.150
Terrell NC 28682
cc: Karrie-Jo Shell, USEPA Region 4
(61 Forsyth St, SW, Mail Code 9T25,Atlanta, GA 30303-8960)
be Brad Loveland, EHS-CCP P&C
J. Scott La Sala, Marshall
Julie Stahl, EHS-Water Resources
UPS tracking-
NCDEQ, DWR 1Z8955X40397237477
NCDEQ,Water Sciences IZ8955X40395968084
USEPA I Z8955X4039949 t 699
www.duke-energy.com
A-4

ATTACHMENT: 2018 LAKE NORMAN 316(a)STUDY PLAN
A-5

2018 LAKE NORMAN 316(a)STUDY PLAN
Marshall Steam Station
MONITORING CATEGORY FREQUENCY LOCATIONS
Fisheries
• Electrofishing Spring and Fall Lakewide(32 Transects;see map)
Water Quality
• Field/In Situ—Profile/Other Quarterly Lakewide(15 Locations;see map)
Water Chemistry
• Lab/Analytical—Surface Quarterly Lakewide(15 Locations;see map)
• Lab/Analytical—Photic Zone Quarterly Lakewide(15 Locations;see map)
Productivity
• Lab/Analytical—Photic Zone Quarterly;When Algal Bloom Lakewide(15 Locations;see map)
is Indicated(phytoplankton)
Habitat Formers
• Survey Summer Lakewide
Vertebrate Wildlife
• Survey Summer Thermal discharge area
WATER QUALITY/WATER CHEMISTRY/PRODUCTIVITY MONITORING VARIABLES
Water Quality
• Field/In Situ—Profile Surface to 10m @ lm intervals,10m to bottom @ 2m intervals.
Temperature,Dissolved Oxygen(DO),Specific Conductance,pH.
• Field/In Situ—Surface/Other Turbidity,Secchi Depth
Water Chemistry
• Lab/Analytical—Surface Major ions(Ca,Mg,CI,SO4),Hardness(calculated),Total and
Dissolved Metals(Cu,Zn),Nutrients(TP,TKN,NO3+NO2,NH3,
OrthoP)
Productivity
• Lab/Analytical—Photic Zone Chlorophyll a;Phytoplankton Identification and Density(only
when a bloom is indicated)
A-6

2018 LAKE NORMAN 316(a)STUDY PLAN
Marshall Steam Station
N
o • ®
. N
Sampling Locations: Areal
O Water Quality
• Electrofishng - • ♦
0
0
Marshall
0 r
Steam 15 MooreeviBe
Station • (2 mi.)
•O• 1 ?i ,L( --►
o, a Area CI
•[Area D
•
N�
0
• [Area B1 •
Davidson
m •
•• 0
\ . •
•
• I
4 , • /
0 0.5 1 2 les Cowans \ - H__�'.Y_73
Ford Dam • , • 1
r ` 11
McGuire Nuclear • Charlotte I
0 0.75 1.5 3 Kilome Station (14 mi.)
A-7

Appendix B
B-1

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Appendix C
C-1

Appendix C. Box and whisker plots comparing historical (1990-2013) analytical data to 2014-2020.
PLOT KEY:
I Historical data
( 2014-2020 data
it
Horizontal line represents median 9
Boxes show 25th and 751h percentiles
0
Whiskers show 10'h and 90th percentiles
9
Lake-wide includes samples from
all zones
C D Lake-wide
Zones
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C-2

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C-11

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C D Lake-wide C D Lake-wide C D Lake-wide C D Lake-wide
C-12

CWA 4316(a)Balanced and Indigenous Community Study Report(2014-2020)
MARSHALL STEAM STATION
Appendix D
D-1

Appendix D. Fish captured during 2014-2020 sampling in Lake Norman.
Family Species Scientific name Origin Tolerance Trophic
rating guild
Catostomidae Quillback Carpiodes cyprinus Native Intermediate Omnivore
Shorthead Redhorse Moxostoma macrolepidotum Native Intermediate Insectivore
Centrarchidae Alabama Bass Micropterus henshalli Introduced Not Defined Piscivore
Black Crappie Pomoxis nigromaculatus Native Intermediate Piscivore
Bluegill Lepomis macrochirus Native Intermediate Insectivore
Green Sunfish Lepomis cyanellus Introduced Tolerant Insectivore
Hybrid black bass Micropterus sp. Hybrid Not Defined Piscivore
Hybrid sunfish Lepomis sp. Hybrid Not Defined Insectivore
Largemouth Bass Micropterus salmoides Native Intermediate Piscivore
Redbreast Sunfish Lepomis auritus Native Tolerant Insectivore
Redear Sunfish Lepomis microlophus Native Intermediate Insectivore
Warmouth Lepomis gulosus Native Intermediate Insectivore
Clupeidae Alewife Alosa pseudoharengus Introduced Intermediate Insectivore
Gizzard Shad Dorosoma cepedianum Native Intermediate Omnivore
Threadfin Shad Dorosoma pretense Introduced Intermediate Omnivore
Cyprinidae Common Carp Cyprinus carpio Introduced Tolerant Omnivore
Golden Shiner Notemigonus crysoleucas Native Tolerant Omnivore
Grass Carp Ctenopharyngodon idella Introduced Not Defined Herbivore
Greenfin Shiner Cyprinella chloristia Native Intermediate Insectivore
Spottail Shiner Notropis hudsonius Native Intermediate Omnivore
Whitefin Shiner Cyprinella nivea Native Intermediate Insectivore
Ictaluridae Blue Catfish Ictalurus furcatus Introduced Intermediate Piscivore
Channel Catfish Ictalurus punctulatus Introduced Intermediate Omnivore
Flathead Catfish Pylodictis olivaris Introduced Intermediate Piscivore
Lepisosteidae Longnose Gar Lepisosteus osseus Native Tolerant Piscivore
Moronidae Striped Bass Morone saxatilis Introduced Intermediate Piscivore
White Perch Morone americana Introduced Intermediate Piscivore
Percidae Fantail Darter Etheostoma flabellare Native Intermediate Insectivore
Tessellated Darter Etheostoma olmstedi Native Intermediate Insectivore
Yellow Perch Perca flavescens Native Intermediate Piscivore
Poeciliidae Eastern Mosquitofish Gambusia holbrooki Native Tolerant Insectivore
D-2

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Duke Energy Environmental Sciences
Huntersville, NC
February 2021
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ENERGY

Fish Tissue Monitoring of Lake Norman
MARSHALL STEAM STATION
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Contents
1 Introduction 1
2 Methods 3
2.1 Fish Collection 3
2.2 Fish Muscle Tissue Analysis 3
3 Results and Discussion 3
3.1 Fish Collection 3
3.2 Fish Muscle Tissue Analysis 4
4 Summary 6
5 References 6
Tables
Table 3-1. Numbers and total length ranges(mm) of different species of fish collected for trace element
analyses in the three areas of Lake Norman during 2015-2020 4
Table 3-2. Means and ranges of trace elements in fish muscle tissue collected from three sampling areas
of Lake Norman during 2015-2020.All values are in µg/g wet weight, and the USEPA screening
values are shown next to each element.When concentrations were less than the reporting limit,
the reporting limit value was used for analysis. 4
Figures
Figure 1-1.Sampling areas for trace element fish tissue monitoring in Lake Norman.Error! Bookmark not
defined.
Figure 3-1. Box plots of trace element analysis of fish muscle tissue for sunfish and black bass collected
from three areas of Lake Norman during 2015-2020.The horizontal line represents the median,
the boxes represent the 25th and 75th percentile, and the whiskers show 10th and 90'
percentiles. Outliers are shown as points Error! Bookmark not defined.
Appendices
Appendix A.Arsenic, selenium, and mercury concentrations(wet weight) in axial muscle of fish from
Lake Norman during 2015-2020.

Fish Tissue Monitoring of Lake Norman
MARSHALL STEAM STATION
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1 Introduction
Duke Energy Carolinas(DEC) owns and operates the Marshall Steam Station (MSS) located on Lake
Norman in Catawba County,Terrell, North Carolina.The MSS National Pollutant Discharge Elimination
System (NPDES) Permit(No. NC0004987,Section A.28) requires DEC to conduct annual trace element
monitoring of fish muscle tissue, specifically arsenic,selenium, and mercury, associated with ash basin
discharges at Outfall 002.This work was conducted in accordance with a study plan (Duke Energy 2018)
submitted to the North Carolina Department of Environmental Quality(NCDEQ) on September 4, 2018
and subsequently approved on April 17, 2019.
Target fish were collected from three areas on Lake Norman (Figure 1-1)for trace element analysis of
muscle tissue.Area UP was located approximately 4 to 10 km upstream of the Outfall 002 discharge and
served as a reference area for monitoring background trace element concentrations in fish muscle
tissue.Area DI was in the vicinity of the MSS discharge canal and served to monitor potential near-field
uptake of elements in fish muscle tissue.Area DN was located approximately 11 to 17 km downstream
of the Outfall 002 discharge and served to monitor far-field uptake of trace elements in fish muscle
tissue.These areas were similar to those previously monitored for trace elements in fish muscle tissue
near MSS(Duke Energy 2014).
INTENTIONALLY LEFT BLANK. SECTION 2 BEGINS ON PAGE 3.
1

Fish Tissue Monitoring of Lake Norman
MARSHALL STEAM STATION
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2
L

Fish Tissue Monitoring of Lake Norman
MARSHALL STEAM STATION
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2 Methods
2.1 Fish Collection
Fish were collected using boat electrofishing. Fish retained for trace element analysis were identified to
species, measured for total length to the nearest millimeter,weighed to the nearest gram, and marked
with a unique tag identifier. Fish were then placed in a labeled (sample date, sample area,facility,etc.)
bag on ice while in the field. Each day the sealed bags of fish were transferred to a deep freezer.
Species targeted for collection were based on prior sampling experience, likely availability, importance
as food fish, and general trophic level.Species groups identified for collection were black bass
(Micropterus) and sunfish (Lepomis). Each year, DEC personnel collected six individuals of each taxa from
each of the three identified sampling areas.Specimens retained for analysis were individuals considered
of sufficient size for human consumption (>60 g).At a given site, and as recommended by the U.S.
Environmental Protection Agency(USEPA),fish were retained such that the size of the smallest
individual was not less than 75%of the total length of the largest fish within each taxa group(USEPA
2000).
2.2 Fish Muscle Tissue Analysis
All fish were processed in the laboratory for muscle tissue sample preparation and trace element
(metals) analysis according to Duke Energy Procedure NR-00107 Rev. 4 Trace Element Monitoring
Laboratory Procedure (approved SOP on file with NCDEQ as of the study plan submittal date).Quality
control was achieved utilizing analytical standards, replicates, and certified reference materials.
Following analysis, residual processed samples were archived and saved for at least two years if re-
analysis is needed.
3 Results and Discussion
3.1 Fish Collection
During the six years evaluated in this report(2015-2020), a total of 108 individuals from each taxon
were collected and analyzed.This total included 36 of each taxon from each sampling area in Lake
Norman (Table 3-1). Species collected for analysis included Largemouth Bass Micropterus salmoides,
Alabama Bass M. henshalii, Bluegill Lepomis macrochirus, Green Sunfish L. cyanellus, Redbreast sunfish
L. auritus,and Redear Sunfish L. macrochirus. Fish were collected in relative proportions to their
abundances in Lake Norman with respect to the minimum size requirement.Alabama Bass and Redear
Sunfish were the most frequently collected species, although other species were collected where
available (Table 3-1).The sizes of sunfish and black bass collected for analysis were generally similar
across species and sampling areas(Table 3-1). Raw data for fish collected during 2015-2020 and
associated trace element concentrations are presented in Appendix A.
3

Fish Tissue Monitoring of Lake Norman
MARSHALL STEAM STATION
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Table 3-1.Numbers and total length ranges(mm)of different species of fish collected for trace element
analyses in the three areas of Lake Norman during 2015-2020.
UP DI DN
Number Total length Number Total length Number Total length
range range range
Black bass Largemouth Bass 1 350 4 331-490 3 239-334
(Micropterus) Alabama Bass 35 312-457 32 217-474 33 241-413
Bluegill 9 156-192 13 156-210 7 151-202
Sunfish Green Sunfish 0 0 3 166-182
(Lepomis) Redbreast Sunfish 0 4 175-182 6 151-195
Redear Sunfish 27 157-277 19 160-280 20 160-250
3.2 Fish Muscle Tissue Analysis
Resulting fish muscle tissue trace element concentrations were compared to screening values, in wet
weight,of 1.2 µg/g for arsenic, 20 µg/g for selenium, and 0.4 µg/g for mercury(USEPA 2000).All fish
except one collected during 2015-2020 were below the USEPA screening values for all three trace
elements(Table 3-2; Figure 3-1).The exception was an individual Alabama Bass collected in area UP with
a mercury concentration of 0.57 µg/g.This fish was collected upstream of the ash basin discharge, and
therefore,the elevated concentration was likely unrelated to MSS Outfall 002 discharges.
Table 3-2.Means and ranges of trace elements in fish muscle tissue collected from three sampling areas
of Lake Norman during 2015-2020. All values are in µg/g wet weight,and the USEPA screening values
are shown next to each element.When concentrations were less than the reporting limit,the reporting
limit value was used for analysis.
Arsenic (1.2) Selenium (20) Mercury(0.4)
Mean Range Mean Range Mean Range
UP Black bass 0.16 <0.04-0.36 0.28 0.18-0.42 0.17 <0.06-0.57
Sunfish 0.13 <0.04-0.29 0.35 0.17-0.57 0.08 <0.05-0.24
DI Black bass 0.16 <0.04-0.36 0.38 0.26-0.53 0.17 <0.06-0.35
Sunfish 0.16 <0.04-0.48 0.53 0.31-0.88 0.09 <0.05-0.18
DN Black bass 0.16 <0.04-0.35 0.44 0.27-0.60 0.13 <0.06-0.29
Sunfish 0.12 <0.04-0.24 0.59 0.27-0.97 0.08 <0.05-0.16
4

Fish Tissue Monitoring of Lake Norman
MARSHALL STEAM STATION
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Figure 3-1. Box plots of trace element analysis of fish muscle tissue for sunfish and black bass collected
from three areas of Lake Norman during 2015-2020. The horizontal line represents the median, the
boxes represent the 25th and 75th percentile, and the whiskers show 10th and 90th percentiles. Outliers
are shown as points.
5

Fish Tissue Monitoring of Lake Norman
MARSHALL STEAM STATION
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4 Summary
In accordance with NPDES Permit#NC0004987, 108 sunfish and 108 black bass were collected from
Lake Norman during 2015-2020 for analysis of trace elements in muscle tissue. Fish collected during this
period were below the USEPA screening levels for the three metals analyzed, except for one individual
which was collected upstream of MSS.Arsenic and mercury concentrations in fish muscle tissue were
not elevated in the near field discharge area when compared to the upstream reference.While there
was an increasing trend in selenium concentrations from upstream to downstream, all concentrations
were below USEPA screening levels. Fish muscle tissue trace element data collected during 2015-2020
were consistent with data reported previously from Lake Norman (Duke Energy 2014).
5 References
Duke Energy. 2014. Monitoring of arsenic, selenium, and mercury in fish muscle tissue from Lake
Norman, NC. Charlotte, NC.
Duke Energy. 2018. Fish Tissue Monitoring of Lake Norman Study Plan. Charlotte, NC.
USEPA. 2000. Guidance for assessing chemical contaminant data for use in fish advisories.Vol. 1. Fish
sampling and analysis.Third edition. EPA 823-B-00-007. United States Environmental Protection
Agency, Office of Water, Washington, DC.
6

Fish Tissue Monitoring of Lake Norman
MARSHALL STEAM STATION
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Appendices
A-1
1

Fish Tissue Monitoring of Lake Norman
MARSHALL STEAM STATION
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Appendix A.Arsenic,selenium,and mercury concentrations(wet weight) in axial muscle of fish from
Lake Norman during 2015-2020.
Dry-to-
wet
Length Weight As Se Hg weight
Fish species Location Sample date (mm) (g) (µg/g) (µg/g) (µg/g) ratio
Redear Sunfish UP April 2015 251 261 0.06 0.31 <0.06 0.204
Redear Sunfish UP April 2015 227 200 0.07 0.35 0.09 0.197
Redear Sunfish UP April 2015 259 306 0.06 0.28 0.09 0.183
Redear Sunfish UP April 2015 247 186 0.06 0.34 0.24 0.167
Redear Sunfish UP April 2015 231 190 <0.04 0.24 0.09 0.198
Redear Sunfish UP April 2015 238 213 0.04 0.33 0.11 0.190
Alabama Bass UP April 2015 448 1110 0.07 0.25 0.28 0.179
Alabama Bass UP April 2015 410 780 0.05 0.36 0.31 0.211
Alabama Bass UP April 2015 430 831 0.05 0.18 0.13 0.172
Alabama Bass UP April 2015 417 924 0.07 0.35 0.27 0.196
Alabama Bass UP April 2015 372 773 0.05 0.21 0.19 0.172
Alabama Bass UP April 2015 457 1224 0.04 0.33 0.30 0.191
Alabama Bass DI March 2015 462 1242 <0.04 0.39 0.26 0.193
Alabama Bass DI March 2015 458 1342 <0.04 0.48 0.35 0.186
Largemouth Bass DI March 2015 447 1152 0.05 0.34 0.25 0.186
Largemouth Bass DI March 2015 475 1575 0.08 0.52 0.32 0.188
Largemouth Bass DI March 2015 490 1788 0.08 0.34 0.26 0.179
Alabama Bass DI March 2015 438 1106 0.06 0.31 0.23 0.198
Redear Sunfish DI April 2015 218 160 0.21 0.56 0.11 0.202
Redear Sunfish DI April 2015 215 171 0.21 0.71 0.08 0.212
Redear Sunfish DI April 2015 252 248 0.17 0.73 0.16 0.182
Redear Sunfish DI April 2015 280 352 <0.04 0.60 0.18 0.192
Redear Sunfish DI April 2015 257 296 0.10 0.59 0.15 0.185
Bluegill DI April 2015 210 173 <0.04 0.37 0.17 0.183
Alabama Bass DN April 2015 330 430 <0.04 0.36 0.17 0.198
Alabama Bass DN April 2015 385 685 0.09 0.27 0.20 0.195
Alabama Bass DN April 2015 360 545 0.05 0.38 0.18 0.189
Alabama Bass DN April 2015 400 730 0.05 0.38 0.17 0.182
Alabama Bass DN April 2015 375 604 0.05 0.36 0.19 0.187
Alabama Bass DN April 2015 350 479 0.08 0.29 0.27 0.193
Redear Sunfish DN April 2015 250 278 0.07 0.50 0.13 0.193
Bluegill DN April 2015 187 125 <0.04 0.39 0.16 0.190
Redear Sunfish DN April 2015 194 109 0.18 0.51 0.12 0.181
Redear Sunfish DN April 2015 185 99 0.06 0.51 0.11 0.191
Bluegill DN April 2015 194 150 0.17 0.34 0.09 0.196
Bluegill DN April 2015 202 167 0.21 0.27 0.13 0.208
Bluegill UP April 2016 170 79 0.04 0.23 0.15 0.189
Bluegill UP April 2016 166 84 <0.04 0.17 0.14 0.191
Bluegill UP April 2016 163 80 <0.04 0.21 0.09 0.188
Bluegill UP April 2016 177 98 <0.04 0.22 0.07 0.191
A-2

Fish Tissue Monitoring of Lake Norman
MARSHALL STEAM STATION
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Dry-to-
wet
Length Weight As Se Hg weight
Fish species Location Sample date (mm) (g) (µg/g) (µg/g) (µg/g) ratio
Bluegill UP April 2016 158 68 <0.04 0.19 0.10 0.184
Bluegill UP April 2016 156 67 <0.04 0.22 <0.05 0.192
Alabama Bass UP April 2016 440 998 <0.04 0.22 0.28 0.179
Alabama Bass UP April 2016 316 349 0.09 0.20 <0.06 0.210
Alabama Bass UP April 2016 405 788 0.13 0.19 0.10 0.188
Alabama Bass UP April 2016 315 272 0.13 0.19 0.11 0.196
Alabama Bass UP April 2016 315 375 0.08 0.19 0.12 0.205
Alabama Bass UP April 2016 400 656 0.10 0.22 0.26 0.179
Bluegill DI April 2016 194 135 <0.04 0.46 0.14 0.200
Bluegill DI April 2016 180 103 <0.04 0.45 0.11 0.195
Bluegill DI April 2016 163 81 <0.04 0.38 0.09 0.194
Bluegill DI April 2016 172 84 0.10 0.31 0.17 0.189
Bluegill DI April 2016 156 69 <0.04 0.32 <0.05 0.198
Bluegill DI April 2016 162 68 0.06 0.34 0.11 0.188
Alabama Bass DI April 2016 410 616 0.04 0.52 0.35 0.172
Alabama Bass DI April 2016 404 764 0.10 0.35 0.22 0.194
Alabama Bass DI April 2016 474 1156 <0.04 0.41 0.28 0.178
Alabama Bass DI April 2016 384 640 0.13 0.27 0.14 0.207
Alabama Bass DI April 2016 455 993 0.05 0.39 0.29 0.180
Alabama Bass DI April 2016 450 1125 0.09 0.31 0.25 0.204
Green Sunfish DN November 2016 166 80 <0.04 0.32 0.07 0.178
Bluegill DN November 2016 166 77 <0.04 0.32 0.08 0.187
Redbreast Sunfish DN November 2016 164 62 <0.04 0.37 0.06 0.200
Bluegill DN November 2016 151 51 <0.04 0.38 <0.05 0.182
Green Sunfish DN November 2016 175 111 <0.04 0.32 0.10 0.188
Redbreast Sunfish DN November 2016 151 52 <0.04 0.36 0.09 0.189
Alabama Bass DN November 2016 241 127 0.06 0.40 0.13 0.208
Alabama Bass DN November 2016 270 210 0.04 0.41 0.12 0.216
Alabama Bass DN November 2016 312 319 <0.04 0.37 0.07 0.207
Alabama Bass DN November 2016 276 228 <0.04 0.47 0.07 0.206
Largemouth Bass DN November 2016 284 242 0.07 0.49 0.14 0.212
Largemouth Bass DN November 2016 239 138 0.07 0.45 0.12 0.204
Redear Sunfish UP March 2017 252 266 <0.04 0.30 <0.05 0.199
Redear Sunfish UP March 2017 272 335 <0.04 0.26 <0.06 0.206
Redear Sunfish UP March 2017 227 205 <0.04 0.24 <0.06 0.213
Redear Sunfish UP March 2017 225 194 <0.04 0.24 <0.06 0.213
Redear Sunfish UP March 2017 263 342 <0.04 0.35 <0.06 0.211
Redear Sunfish UP March 2017 277 394 <0.04 0.34 0.07 0.206
Alabama Bass UP March 2017 395 670 <0.04 0.19 0.27 0.207
Alabama Bass UP March 2017 390 660 <0.04 0.18 0.16 0.193
Alabama Bass UP March 2017 367 547 <0.04 0.23 0.12 0.215
Alabama Bass UP March 2017 445 1050 <0.04 0.24 0.21 0.201
Alabama Bass UP March 2017 353 467 <0.04 0.19 0.15 0.208
Alabama Bass UP March 2017 396 776 <0.04 0.24 0.06 0.212
Redear Sunfish DI March 2017 194 105 <0.04 0.64 <0.06 0.211
A-3

Fish Tissue Monitoring of Lake Norman
MARSHALL STEAM STATION
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Dry-to-
wet
1 Length Weight As Se Hg weight
Fish species Location Sample date (mm) (g) (µg/g) (µg/g) (µg/g) ratio
Bluegill DI March 2017 181 96 <0.04 0.38 <0.05 0.197
Alabama Bass DI March 2017 362 544 <0.04 0.32 0.10 0.196
Alabama Bass DI March 2017 355 537 <0.04 0.26 0.16 0.202
Alabama Bass DI March 2017 334 380 <0.04 0.35 0.07 0.206
Alabama Bass DI March 2017 395 700 <0.04 0.31 0.20 0.198
Alabama Bass DI March 2017 361 566 <0.04 0.36 0.13 0.202
Alabama Bass DI March 2017 328 380 <0.04 0.37 0.09 0.216
Redear Sunfish DI October 2017 178 91 <0.04 0.61 <0.06 0.207
Redbreast Sunfish DI October 2017 182 91 <0.04 0.48 0.14 0.209
Redbreast Sunfish DI October 2017 180 94 <0.04 0.46 <0.05 0.182
Redbreast Sunfish DI October 2017 181 105 <0.04 0.51 <0.06 0.211
Alabama Bass DN March 2017 350 485 <0.04 0.38 0.08 0.201
Alabama Bass DN March 2017 362 563 <0.04 0.37 <0.06 0.212
Alabama Bass DN March 2017 397 739 <0.04 0.41 <0.06 0.209
Alabama Bass DN March 2017 385 729 <0.04 0.48 <0.06 0.210
Alabama Bass DN March 2017 336 440 <0.04 0.45 0.14 0.207
Alabama Bass DN March 2017 354 560 <0.04 0.33 0.16 0.216
Redear Sunfish DN October 2017 210 146 <0.04 0.81 <0.06 0.207
Redear Sunfish DN October 2017 219 177 <0.04 0.78 0.06 0.212
Redear Sunfish DN October 2017 222 174 <0.04 0.83 <0.06 0.204
Redear Sunfish DN October 2017 204 128 <0.04 0.72 <0.05 0.202
Redbreast Sunfish DN October 2017 186 120 <0.04 0.56 <0.05 0.191
Redear Sunfish DN December 2017 -- -- <0.04 0.92 0.09 0.208
Alabama Bass UP April 2018 314 359 0.30 0.30 0.08 0.20
Alabama Bass UP April 2018 314 363 0.18 0.30 0.09 0.21
Alabama Bass UP April 2018 337 436 0.27 0.33 0.08 0.21
Alabama Bass UP April 2018 347 489 0.25 0.33 0.08 0.21
Alabama Bass UP April 2018 360 558 0.27 0.31 0.13 0.21
Alabama Bass UP April 2018 384 630 0.20 0.27 0.13 0.19
Redear Sunfish UP April 2018 157 63 0.16 0.39 <0.06 0.20
Redear Sunfish UP April 2018 171 81 0.15 0.48 <0.06 0.20
Redear Sunfish UP April 2018 178 84 0.25 0.39 <0.06 0.21
Redear Sunfish UP April 2018 184 98 0.20 0.40 0.06 0.21
Redear Sunfish UP April 2018 191 119 0.21 0.40 <0.06 0.21
Redear Sunfish UP April 2018 193 133 0.18 0.54 <0.06 0.20
Alabama Bass DI April 2018 217 98 0.24 0.40 0.07 0.201
Alabama Bass DI April 2018 224 105 0.27 0.30 <0.06 0.201
Alabama Bass DI April 2018 232 117 0.26 0.43 0.06 0.201
Alabama Bass DI April 2018 237 118 0.23 0.39 0.06 0.201
Alabama Bass DI April 2018 257 182 0.24 0.36 0.07 0.201
Alabama Bass DI April 2018 261 177 0.26 0.38 <0.06 0.201
Bluegill DI April 2018 174 95 0.36 0.31 <0.06 0.201
Redear Sunfish DI April 2018 160 66 0.18 0.51 <0.06 0.201
Redear Sunfish DI April 2018 170 84 0.22 0.52 <0.06 0.201
Redear Sunfish DI April 2018 182 106 0.20 0.57 <0.06 0.201
1 Dry-to-wet weight ratio is not available for these fish.An average value of 0.20 is presented here instead.
A-4

Fish Tissue Monitoring of Lake Norman
MARSHALL STEAM STATION
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Dry-to-
wet
Length Weight As Se Hg weight
Fish species Location Sample date (mm) (g) (µg/g) (µg/g) (µg/g) ratio
Redear Sunfish DI April 2018 185 98 0.17 0.75 <0.06 0.201
Redear Sunfish DI April 2018 165 70 0.22 0.54 <0.06 0.201
Alabama Bass DN April 2018 340 432 0.28 0.40 0.09 0.20
Alabama Bass DN April 2018 325 386 0.25 0.44 0.08 0.20
Alabama Bass DN April 2018 332 436 0.25 0.46 0.09 0.21
Alabama Bass DN April 2018 335 378 0.23 0.45 0.12 0.19
Alabama Bass DN April 2018 328 390 0.25 0.42 0.07 0.20
Alabama Bass DN April 2018 342 462 0.21 0.47 0.08 0.21
Bluegill DN April 2018 178 98 0.19 0.44 <0.05 0.18
Green Sunfish DN April 2018 182 112 0.16 0.36 <0.06 0.20
Redbreast Sunfish DN April 2018 194 126 0.15 0.59 <0.06 0.20
Redbreast Sunfish DN April 2018 195 142 0.18 0.50 <0.06 0.20
Redear Sunfish DN April 2018 237 222 0.19 0.74 <0.06 0.21
Alabama Bass UP April 2019 314 318 0.21 0.29 0.26 0.189
Alabama Bass UP April 2019 334 417 0.20 0.28 0.13 0.201
Alabama Bass UP April 2019 389 710 0.20 0.28 0.13 0.202
Redear Sunfish UP April 2019 231 217 0.19 0.34 <0.06 0.190
Redear Sunfish UP April 2019 248 258 0.24 0.36 <0.06 0.201
Alabama Bass UP April 2019 326 369 0.25 0.34 0.13 0.210
Alabama Bass UP April 2019 399 623 0.31 0.29 0.08 0.203
Largemouth Bass UP April 2019 350 520 0.19 0.30 0.11 0.195
Redear Sunfish UP April 2019 238 245 0.19 0.39 0.07 0.198
Redear Sunfish UP April 2019 244 245 0.21 0.41 <0.06 0.206
Redear Sunfish UP April 2019 246 250 0.19 0.37 0.07 0.198
Redear Sunfish UP April 2019 250 288 0.22 0.37 <0.06 0.205
Alabama Bass DI March 2019 315 356 0.27 0.33 0.08 0.195
Alabama Bass DI March 2019 393 632 0.21 0.29 0.19 0.194
Bluegill DI March 2019 176 88 0.21 0.37 <0.06 0.200
Redear Sunfish DI March 2019 165 75 0.16 0.59 <0.06 0.187
Redear Sunfish DI March 2019 180 84 0.18 0.54 <0.06 0.186
Alabama Bass DI March 2019 369 579 0.18 0.43 0.08 0.197
Bluegill DI March 2019 194 143 0.48 0.31 <0.06 0.213
Largemouth Bass DI March 2019 331 459 0.25 0.30 0.13 0.182
Redear Sunfish DI March 2019 182 82 0.20 0.61 <0.06 0.206
Alabama Bass DI March 2019 337 430 0.23 0.39 0.10 0.187
Alabama Bass DI March 2019 343 445 0.29 0.38 0.11 0.220
Bluegill DI March 2019 190 145 0.19 0.35 <0.06 0.194
Alabama Bass DN April 2019 388 610 0.23 0.45 0.15 0.188
Redear Sunfish DN April 2019 169 77 0.15 0.68 <0.06 0.187
Alabama Bass DN April 2019 337 477 0.26 0.39 0.08 0.209
Alabama Bass DN April 2019 342 419 0.23 0.35 0.10 0.206
Bluegill DN April 2019 172 89 0.16 0.75 <0.06 0.199
Largemouth Bass DN April 2019 334 536 0.19 0.43 0.12 0.204
Redear Sunfish DN April 2019 160 62 0.16 0.61 <0.06 0.203
Redear Sunfish DN April 2019 162 76 0.15 0.60 <0.06 0.207
1 Dry-to-wet weight ratio is not available for these fish.An average value of 0.20 is presented here instead.
A-5

Fish Tissue Monitoring of Lake Norman
MARSHALL STEAM STATION
Error!Reference source not found.
Dry-to-
wet
Length Weight As Se Hg weight
Fish species Location Sample date (mm) (g) (µg/g) (µg/g) (µg/g) ratio
Redear Sunfish DN April 2019 182 87 0.16 0.72 <0.06 0.187
Alabama Bass DN April 2019 378 580 0.20 0.49 0.08 0.202
Alabama Bass DN April 2019 392 678 0.26 0.53 0.29 0.203
Redear Sunfish DN April 2019 183 96 0.23 0.61 <0.06 0.211
Alabama Bass UP April 2020 392 634 0.20 0.38 0.57 0.21
Alabama Bass UP April 2020 317 356 0.35 0.39 0.08 0.25
Alabama Bass UP April 2020 329 394 0.33 0.42 0.12 0.26
Alabama Bass UP April 2020 312 342 0.32 0.41 0.12 0.25
Alabama Bass UP April 2020 354 441 0.32 0.42 0.13 0.25
Alabama Bass UP April 2020 343 451 0.36 0.41 0.14 0.26
Bluegill UP April 2020 172 83 0.21 0.37 <0.07 0.23
Bluegill UP April 2020 192 119 0.19 0.46 0.09 0.23
Bluegill UP April 2020 172 104 0.29 0.45 <0.08 0.26
Redear Sunfish UP April 2020 200 141 0.24 0.55 <0.08 0.26
Redear Sunfish UP April 2020 185 103 0.24 0.57 <0.08 0.26
Redear Sunfish UP April 2020 168 76 0.24 0.55 <0.08 0.26
Alabama Bass DI April 2020 351 478 0.31 0.44 0.12 0.25
Alabama Bass DI April 2020 364 559 0.28 0.45 0.2 0.23
Alabama Bass DI April 2020 356 475 0.31 0.45 0.14 0.25
Alabama Bass DI April 2020 399 677 0.29 0.49 0.32 0.23
Alabama Bass DI April 2020 322 334 0.36 0.53 0.2 0.25
Alabama Bass DI April 2020 328 349 0.33 0.39 0.13 0.24
Bluegill DI April 2020 189 113 0.28 0.64 <0.08 0.27
Redbreast Sunfish DI April 2020 175 102 0.34 0.49 <0.08 0.25
Redear Sunfish DI April 2020 181 106 0.28 0.88 <0.10 0.32
Redear Sunfish DI April 2020 195 124 0.26 0.76 <0.08 0.26
Redear Sunfish DI April 2020 180 100 0.22 0.70 <0.08 0.27
Redear Sunfish DI April 2020 226 200 0.22 0.77 <0.08 0.25
Alabama Bass DN June 2020 413 866 0.29 0.60 0.15 0.28
Alabama Bass DN June 2020 340 431 0.30 0.60 0.09 0.27
Alabama Bass DN June 2020 390 662 0.28 0.60 0.12 0.27
Alabama Bass DN June 2020 382 578 0.34 0.52 0.20 0.26
Alabama Bass DN June 2020 382 601 0.35 0.50 0.14 0.27
Alabama Bass DN June 2020 359 505 0.34 0.55 0.12 0.28
Redear Sunfish DN June 2020 183 98 0.20 0.72 <0.08 0.26
Redear Sunfish DN June 2020 194 130 0.21 0.82 <0.08 0.26
Redear Sunfish DN June 2020 230 234 0.21 0.97 <0.08 0.26
Redear Sunfish DN June 2020 173 73 0.24 0.83 <0.08 0.26
Redear Sunfish DN June 2020 192 126 0.20 0.80 <0.08 0.27
Redbreast Sunfish DN June 2020 176 111 0.20 0.70 <0.07 0.24
A-6

Marshall Instream Results
Upstream Outfall 002
2021 NPDES Permit Renewal Application
As,Total Hardness,
Hg,Total Se,Total
Depth Recoverable Cd,Dissolved Cr,Total Cu,Dissolved Total(mg/L Pb,Dissolved USEPA 1631E Recoverable TOS Turbidity Zn,Dissolved
Facility Date Time Location Code Location (m) (pg/L) Bromide(mg/L) (pg/L) (pg/L) (yg/L) as CaCO3)
Ipa/U (pg/L) (pB/L) (m8/L) (NTU) (14/L)
Marshall 55 2014-03-05 12:30 H_2_15.0 Upstream 0.3 <1.00 NRI° < 1.00 < 1.00 1.07 NR < 1.00 < 0.05 <1.00 41 NR 5.44
Marshall SS 2014-08-04 12:15 H_2_15.0 Upstream 0.3 <1.00 NR < 1.00 < 1.00 < 1.00 NR < 1.00 < 0.05 <1.00 72 NR < 2
Marshall SS 2015-02-03 12:44 H_2_15.0 Upstream 0.3 <1.00 NR < 1.00 < 1.00 < 1.00 NR a 1.00 < 0.05 <1.00 41 NR < 5
Marshall 55 2015-08-03 12:19 H_2_15.0 Upstream 0.3 <1.00 NR < 1.00 < 1.00 < 1.00 NR < 1.00 c 0.05 <1.00 65 NR < 5
Marshall SS 2016-02-01 12:06 H_2_15.0 Upstream 0.3 <1.00 NR < 1.00 < 1.00 1.62 NR < 1.00 0.00122 <1.00 25 NR < 5
Marshall SS 2016-08-02 12:03 H_2_15.0 Upstream 0.3 <1.00 NR < 1.00 < 1.00 1.01 NR < 1.00 < 0.50000 <1.00 54 NR < 5
Marshall SS 2017-02-07 12:27 H_2_15.0 Upstream 0.3 a 1.00 0.038121 < 1.00 < 1.00 1.34 18.2 < 1.00 0.00059 <1.00 51 4.1 < 5
Marshall SS 2017-08-09 13:00 H_2_15.0 Upstream 0.3 <1.00 0.038 < 1.00 < 1.00 1.20 15.1 < 1.00 < 0.05 <1.00 76 1.8 < 5
Marshall S5 2018-02-06 14:15 H_2_15.0 Upstream 0.3 <1.00 0.028 < 0.1 < 1.00 1.45 16.5 < 0.2 < 0.05 <1.00 38 1.5 < 5
Marshall 55 2018-06-05 10:58 H_2_UP_INST Upstream 0.2 <1.00 < 0.1 < 0.1 < 1.00 1.54 13.6 < 0.2 0.00094 <1.00 < 25 2.5 < 5
Marshall SS 2018-07-02 10:55 H_2_UP_INST Upstream 0.2 <1.00 < 0.1 < 0.1 < 1.00 2.80 13.7 < 0.2 0.00114 <1.00 32 1.5 < 5
Marshall 55 2018-08-06 14:25 H_2_UP_INST Upstream 0.3 <1.00 0.018 < 0.1 < 1.00 < 1.00 12.7 < 0.2 0.00090 c 1.00 < 25 2.3 < 5
Marshall SS 2018-09-04 11:47 H_2_UP_INST Upstream 0.2 <1.00 0.03 < 0.1 < 1.00 2.06 14.4 < 0.2 0.00050 <1.00 39 1.8 < 5
Marshall 55 2018-10-01 11:50 H_2_UP_INST Upstream 0.2 < 1.00 0.031 < 0.1 < 1.00 1.64 14.1 < 0.2 0.00111 <1.00 37 2.4 < 5
Marshall SS 2018-11-08 15:20 H_2_UP_INST Upstream 0.2 <1.00 0.024 < 0.1 < 1.00 1.51 14.7 < 0.2 0.00087 <1.00 40 4.0 < 5
Marshall SS 2018-12-05 13:30 H_2_UP_INST Upstream 0.2 <1.00 0.032 < 0.1 < 1.00 1.08 15.6 < 0.2 0.00115 <1.00 33 4.3 < 5
Marshall SS 2019-01-03 13:30 H_2_UP_INST Upstream 0.2 <1.00 a 0.01 < 0.1 < 1.00 < 1.00 12.1 a 0.2 0.00205 <1.00 < 25 19 < 5
Marshall SS 2019-02-06 12:20 H_2_UP_INST Upstream 0.2 <1.00 0.015 < 0.1 < 1.00 1.47 13.8 < 0.2 0.00144 <1.00 33 9.0 < 5
Marshall 55 2019-03-04 10:10 H_2_UP_INST Upstream 0.2 <1.00 < 0.01 < 0.1 < 1.00 < 1.00 13.4 < 0.2 0.00166 <1.00 57 11 < 5
Marshall SS 2019-04-01 10:33 H_2_UP_INST Upstream 0.2 <1.00 0.016 < 0.1 < 1.00 < 1.00 13.7 < 0.2 0.00073 <1.00 47 3.6 < 5
Marshall S5 2019-05-02 11:30 H_2_UP_INST Upstream 0.2 <1.00 0.035 < 0.1 < 1.00 2.91 16.5 < 0.2 0.00072 <1.00 50 3.5 < 5 _
Marshall SS 2019-06-03 12:05 H_2_UP_INST Upstream 0.2 <1.00 0.016 < 0.1 < 1.00 1.69 13.8 < 0.2 < 0.0005 <1.00 57 1.9 a 5
Marshall SS 2019-07-08 12:00 H_2_UP_INST Upstream 0.2 <1.00 0.038 < 0.1 < 1.00 3.35 14.9 < 0.2 0.00057 <1.00 41 4.6 a 5
Marshall SS 2019-08-05 10:45 H_2_UP_INST Upstream 0.2 <1.00 0.034 < 0.1 < 1.00 1.71 15.0 < 0.2 < 0.0005 <1.00 39 2.4 < 5
Marshall SS 2019-09-04 09:15 H_2_UP_INST Upstream 0.2 a 1.00 0.027 < 0.1 < 1.00 1.97 15.3 < 0.2 < 0.0005 <1.00 46 2.2 < 5
Marshall 55 2019-10-01 10:50 H_2_UP_INST Upstream 0.2 <1.00 0.037 < 0.1 < 1.00 1.93 17.5 < 0.2 < 0.0005 <1.00 56 2.0 < 5
Marshall S5 2019-11-05 11:00 H_2_UP_INST Upstream 0.2 <1.00 0.034 < 0.1 < 1.00 1.29 17.0 < 0.2 < 0.0005 a 1.00 48 2.8 < 5
Marshall SS 2019-12-09 12:00 H_2_UP_INST Upstream 0.2 <1.00 0.033 < 0.1 < 1.00 1.57 17.2 < 0.2 < 0.0005 a 1.00 40 2.4 < 5
Marshall SS 2020-01-08 11:27 H_2_UP_INST Upstream 0.2 <1.00 0.031 < 0.1 a 1.00 < 1.00 17.5 < 0.2 < 0.0005 <1.00 52 3.5 < 5
Marshall SS 2020-02-12 15:15 H_2_UP_INST Upstream 0.2 <1.00 < 0.01 < 0.1 2.4 1.08 13.4 < 0.2 0.00320 <1.00 48 51 < 5
Marshall 55 2020-03-03 09:30 H_2_UP_INST Upstream 0.2 <1.00 0.013 < 0.1 1.4 1.33 _ 13.9 < 0.2 0.00243 <1.00 65 28 < 5
Marshall SS 2020-04-07 09:45 H_2_UP_INST Upstream 0.2 <1.00 0.014 < 0.1 < 1.00 1.14 15.1 < 0.2 0.00055 <1.00 48 4.4 < 5
Marshall SS 2020-05-12 12:25 H_2_UP_INST Upstream 0.2 <1.00 0.01 < 0.1 < 1.00 < 1.00 13.8 < 0.2 0.00059 <1.00 81 3.7 < 5
Marshall SS 2020-06-08 10:05 H_2_UP_INST Upstream 0.2 <1.00 0.02 < 0.1 < 1.00 1.99 14.6 < 0.2 0.00082 <1.00 65 4.9 < 5
Marshall 55 2020-07-06 13:30 H_2_UP_INST Upstream 0.2 a 1.00 0.024 < 0.1 < 1.00 3.09 15.0 < 0.2 < 0.0005 <1.00 30 2.9 < 5
Marshall SS 2020-08-03 10:00 H_2_UP_INST Upstream 0.2 <1.00 0.026 < 0.1 < 1.00 1.70 13.7 < 0.2 < 0.0005 <1.00 51 2.5 < 5
Marshall 55 2020-09-01 09:48 H_2_UP_INST Upstream 0.2 <1.00 0.035 < 0.1 < 1.00 2.49 13.8 < 0.2 < 0.0005 <1.00 27 2.2 < 5
Marshall 55 2020-10-08 09:10 H_2_UP_INST Upstream 0.2 <1.00 0.026 < 0.1 a 1.00 2.27 12.1 < 0.2 < 0.0005 <1.00 64 3.6 < 5
Marshall SS 2020-11-05 11:35 H_2_UP_INST Upstream 0.2 <1.00 0.026 < 0.1 < 1.00 2.68 12.4 < 0.2 0.63 <1.00 33 3.1 < 5
Marshall SS 2020-12-01 12:47 H_2_UP_INST Upstream 0.2 <1.00 0.016 < 0.1 1.55 2.04 65.0 < 0.2 0.00207 <1.00 65 12 < 5
(1)NR=Not required by permit at time of sampling.
(2)1st Semiannual samples for bromide analysis were collected on 2017-05-02 for the instream locations.
L

Marshal Instream Results
Downstream Outfall 002
2021 NPDES Permit Renewal Application
As,Total Hardness,
Hg,Total Se,Total
Depth Recoverable Cd,Dissolved Cr,Total Cu,Dissolved Total(mg/L Pb,Dissolved USEPA 1631E Recoverable TDS Turbidity Zn,Dissolved
Facility Date Time Location Code Location (m) (pg/L) Bromide(mg/L) (pg/L) (Rg/L( lug/L) as CaCO3) (pg/L) (pg/L) (µg/L) (mg/L) (NTU) (µg/L)
Marshall 55 2014-03-0S 12:01 F_1_14.0 Downstream 0.3 <1.00 NRI'I < 1.00 < 1.00 2.80 NR < 1.00 < 0.05 <1.00 50 NR 4.42
Marshall SS 2014-08-04 11:50 F_1_14.0 Downstream 0.3 <1.00 NR < 1.00 < 1.00 2.21 NR a 1.00 < 0.05 <1.00 51 NR < 2
Marshall SS 2015-02-03 12:05 F_1_14.0 Downstream 0.3 <1.00 NR a 1.00 < 1.00 2.02 NR < 1.00 < 0.05 <1.00 44 NR < 5
Marshall SS 2015-08-03 11:48 F_1_14.0 Downstream 0.3 <1.00 NR < 1.00 < 1.00 1.34 NR < 1.00 < 0.05 <1.00 51 NR < 5
Marshall 55 2016-02-01 11:45 F_1_14.0 Downstream 0.3 <1.00 NR < 1.00 a 1.00 1.55 NR < 1.00 0.00098 a 1.00 < 25 NR < 5
Marshall SS 2016-08-02 11:30 F_1_14.0 Downstream 0.3 <1.00 NR < 1.00 < 1.00 1.46 NR < 1.00 0.00031 a 1.00 42 NR < 5
Marshall SS 2017-02-07 11:50 F_1_14.0 Downstream 0.3 <1.00 0.0541a1 < 1.00 < 1.00 1.46 20.7 < 1.00 0.00074 <1.00 _ 64 6.2 < 5
Marshall SS 2017-08-09 12:20 F_1_14.0 Downstream 0.3 a 1.00 0.065 < 1.00 a 1.00 1.76 21.2 < 1.00 < 0.05 <1.00 54 3.5 < 5
Marshall SS 2018-02-06 13:40 F_1_14.0 Downstream 0.3 <1.00 0.045 < 0.1 < 1.00 1.55 19.7 < 0.2 < 0.05 <1.00 38 2.1 < 5
Marshall SS 2018-06-05 11:50 F_i_ON_INST Downstream 0.2 <1.00 < 0.1 < 0.1 < 1.00 2.19 14.9 < 0.2 0.00112 a 1.00 c 25 3.2 < 5
Marshall SS 2018-07-02 11:25 F_1_DN_INST Downstream 0.2 <1.00 < 0.1 < 0.1 < 1.00 3.84 14.3 < 0.2 0.00155 <1.00 43 1.5 < 5
Marshall SS 2018-08-06 13:15 F_1_DN_INST Downstream 0.3 <1.00 0.054 < 0.1 < 1.00 4.01 21.0 < 0.2 0.00130 <1.00 < 25 4.9 < S
Marshall SS 2018-09-04 12:20 F_1_DN_INST Downstream 0.2 <1.00 0.031 < 0.1 < 1.00 4.17 15.0 < 0.2 0.00050 a 1.00 37 3.2 < 5
Marshall SS 2018-10-01 12:20 F_1_DN_INST Downstream 0.2 <1.00 0.046 < 0.1 < 1.00 3.22 18.1 < 0.2 0.00159 <1.00 41 8.0 a 5
Marshall SS 2018-11-08 14:07 F_1_DN_INST Downstream 0.2 <1.00 0.039 < 0.1 < 1.00 2.58 17.8 < 0.2 0.00103 _ <1.00 62 7.0 < 5
Marshall SS 2018-12-05 13:50 F_1_DN_INST Downstream 0.2 <1.00 0.046 < 0.1 < 1.00 2.84 17.9 < 0.2 0.00138 <1.00 40 8.3 < 5
Marshall SS 2019-01-03 14:00 F_1_DN_INST Downstream 0.2 <1.00 0.041 < 0.1 c 1.00 2.16 18.6 a 0.2 0.00222 <1.00 49 24 < 5
Marshall SS 2019-02-06 12:40 F_1_DN_INST Downstream 0.2 <1.00 0.025 < 0.1 a 1.00 2.17 16.0 < 0.2 0.00139 <1.00 41 8.1 < 5
Marshall SS 2019-03-04 09:45 F_1_DN_INST Downstream 0.2 <1.00 0.026 < 0.1 < 1.00 1.94 16.4 < 0.2 0.00195 <1.00 62 14 < 5
Marshall SS 2019-04-01 11:10 F_1_DN_INST Downstream 0.2 <1.00 0.027 < 0.1 < 1.00 2.22 16.7 < 0.2 0.00078 <1.00 51 5.1 < 5
Marshall 55 2019-05-02 11:00 F_1_DN_INST Downstream 0.2 <1.00 0.035 < 0.1 a 1.00 9.36 19.1 < 0.2 0.00071 <1.00 59 4.8 5.68
Marshall SS 2019-06-03 14:15 F_1_DN_INST Downstream 0.2 <1.00 0.036 < 0.1 < 1.00 4.07 16.8 < 0.2 0.0005 <1.00 59 4.4 < 5
Marshall SS 2019-07-08 12:20 F_3_DN_INST Downstream 0.2 <1.00 0.052 < 0.1 < 1.00 6.71 20.1 < 0.2 0.00132 <1.00 61 14 < 5
Marshall SS 2019-08-05 10:20 F_3_DN_INST Downstream 0.2 <1.00 0.04 < 0.1 < 1.00 2.56 16.1 < 0.2 < 0.0005 <1.00 40 2.7 < 5
Marshall SS 2019-09-04 09:45 F_1_DN_INST Downstream 0.2 a 1.00 0.02 < 0.1 < 1.00 4.96 15.8 < 0.2 < 0.0005 <1.00 51 4.1 < 5
Marshall SS 2019-10-01 13:10 F_3_DN_INST Downstream 0.2 a 1.00 0.061 < 0.1 < 1.00 4.07 22.3 < 0.2 < 0.0005 <1.00 63 4.8 < 5
Marshall SS 2019-11-05 10:40 F_1_DN_INST Downstream 0.2 <1.00 0.059 < 0.1 < 1.00 1.94 22.7 < 0.2 0.00053 <1.00 54 8.5 < 5
Marshall SS 2019-12-09 12:30 F_1_DN_INST Downstream 0.2 <1.00 0.053 < 0.1 < 1.00 3.41 21.1 < 0.2 0.00071 <1.00 57 7.5 < 5
Marshall SS 2020-01-08 12:02 F_1_DN_INST Downstream 0.2 <1.00 0.077 < 0.1 < 1.00 4.00 24.8 < 0.2 0.00051 <1.00 61 6.9 < 5
Marshall SS 2020-02-12 16:50 F_1_DN_INST Downstream 0.2 <1.00 0.025 < 0.1 3.39 2.59 14.7 < 0.2 0.00402 <1.00 54 71 < 5
Marshall SS 2020-03-03 09:57 F_1_DN_INST Downstream 0.2 <1.00 0.036 < 0.1 1.29 2.46 16.8 < 0.2 0.00246 <1.00 58 27 < 5
Marshall SS 2020-04-07 10:20 F_1_DN_INST Downstream 0.2 <1.00 0.02 < 0.1 < 1.00 2.92 16.4 < 0.2 0.00098 <1.00 44 10 < 5
Marshall SS 2020-05-12 12:50 F_1_DN_INST Downstream 0.2 a 1.00 0.019 a 0.1 < 1.00 < 1.00 14.5 < 0.2 0.0005 <1.00 74 2.9 < 5
Marshall SS 2020-06-08 10:40 F_I_DN_INST Downstream 0.2 <1.00 0.031 a 0.1 a 1.00 6.48 17.7 < 0.2 0.00135 <1.00 60 11 < 5
Marshall SS 2020-07-06 14:10 F_7_DN_INST Downstream 0.2 <1.00 0.028 a 0.1 < 1.00 3.50 15.3 < 0.2 0.00054 <1.00 31 3.4 < 5
Marshall SS 2020-08-03 10:25 F_1_DN_INST Downstream 0.2 <1.00 0.033 < 0.1 < 1.00 2.49 14.5 a 0.2 < 0.0005 <1.00 48 2.4 < 5
Marshall SS 2020-09-01 10:20 F_1_DN_INST Downstream 0.2 <1.00 0.062 < 0.1 < 1.00 5.55 19.9 < 0.2 0.00080 <1.00 31 6.1 < 5
Marshall SS 2020-10-08 09:40 F_1_DN_INST Downstream 0.2 <1.00 0.036 < 0.1 < 1.00 3.39 14.5 < 0.2 0.00058 <1.00 88 6.5 < S
Marshall SS 2020-11-05 11:55 F_1_DN_INST Downstream 0.2 <1.00 0.053 < 0.1 < 1.00 5.56 17.1 < 0.2 1.01 <1.00 32 7.8 < 5
Marshall SS 2020-12-01 12:03 F_1_DN_INST Downstream 0.2 <1.00 0.05 < 0.1 1.89 7.26 71.0 < 0.2 0.00256 <1.00 71 17 < S
(1)NR=Not required by permit at time of sampling.
(2)1st Semiannual samples for bromide analysis were collected on 2017-05-02 for the Instream locations.
I
L