NC0003468_Renewal (Application)_20210603

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ROY COOPER �a- �u
Governor J
DIONNE DELLI GATTI M,%" ,. .
Secretory p'"""vr�
S.DANIEL SMITH NORTH CAROLINA
Director Environmental Quality
June 03, 2021
Duke Energy Carolinas, LLC
Attn: Terry Tuck, GM II
864 South Edgewood Road
Eden, NC 27288
Subject: Permit Renewal
Application No. NC0003468
Dan River Combined Cycle
Rockingham County 1
Dear Applicant:
The Water Quality Permitting Section acknowledges the June 3, 2021 receipt of your permit renewal application and
supporting documentation. Your application will be assigned to a permit writer within the Section's NPDES WW permitting
branch. Per G.S. 150B-3 your current permit does not expire until permit decision on the application is made.
Continuation of the current permit is contingent on timely and sufficient application for renewal of the current permit. The
permit writer will contact you if additional information is required to complete your permit renewal. Please respond in a
timely manner to requests for additional information necessary to allow a complete review of the application and renewal
of the permit.
Information regarding the status ofyour renewal application can be found online usingthe Department of Environmental
9 9 Pp P
Quality's Environmental Application Tracker at:
https://deq.nc.gov/permits-regulations/permit-guidance/environmental-application-tracker
If you have any additional questions about the permit, please contact the primary reviewer of the application using the
links available within the Application Tracker.
Sincerely,
c/rl
Wren Thedfor
Administrative Assistant
Water Quality Permitting Section
ec: WQPS Laserfiche File w/application
DE - North Carolina Department of Environmental Qualify vision Water R
�'d/p Winston-Salem Regional Office 450 West Hanes Mill RoDiad.Sukeof 300 Winston-Saesourceslem North Caroina 27105
^ •^�w^� 336 776 9800

fais DUKE Dan River Combined Cycle
ENERGY. Duke Energy Carolinas
864 South Edgewood Road
Eden, NC 27288
May 28, 2021
Dr. Sergei Chernikov
NC Division of Water Resources
1617 Mail Services Center
Raleigh, NC 27699-1617
Subject: Duke Energy Carolinas, LLC RECEIVED
Dan River Combined Cycle Station
NPDES Permit No. NC0003468 JUN 0 3 2021
Rockingham County
Permit Renewal Application NCDEQ/DWR/NPDES
Dear Dr. Chernikov:
Duke Energy Carolinas, LLC, (Duke) requests the subject permit be renewed and reissued. The above
referenced permit expires on November 30, 2021. As mandated by North Carolina Administrative Code
15A NCAC 2H.0105(e), this permit renewal is being submitted at least 180 days prior to expiration of the
current permit.
Please find enclosed in triplicate, the renewal application, which includes the following items:
• EPA Form 1
• EPA Form 2C
• Site Map showing the location of all outfalls (internal and final)
• Waste flow chart and description of waste flows through facility
• Narrative description of sources of pollution and treatment technologies
• List of Potential items not covered by analysis
• 316(a) CORMIX Thermal Mixing Zone Study
• 316(b) Report
• Fish Tissue Sampling
With reissuance, Duke requests the following modifications.
Condition A(1) Outfall 001-
1. Removal of once-through cooling water and treated domestic wastewater from the
description of authorized discharges.
2. Removal of condition that states "All domestic wastewater produced at the power plant is to
be fully treated through the onsite wastewater treatment system prior to being discharged"
statement. Domestic wastewater is no longer discharged and is now handled through an on-
site septic system permitted through Rockingham County,

4. Duke is requesting the re-insertion of a footnote associated with TSS limit. Previous NPDES
permits contained a condition that allows for the monthly average to be 49 mg/L if it is
demonstrated that the concentrate above 30 mg/L was due to the concentration of total
suspended solids in the intake water. Duke requests this condition be re-inserted into the
renewed permit.
5. Removal of mercury monitoring requirement. Mercury monitoring requirement was added to
Outfall 001 in 2016 and was based upon one sampling result. The analytical result for Hg was
incorrectly entered on EPA Form 2C submitted with the 2016 permit renewal request as 478 ug/L.
The actual analytical result for this sampling event was 0.00478 ug/L or 4.86 ng/L. A sample was
collected on 1/27/21 for this permit renewal request. The analytical result for this sampling event
is 4.30 ng/L. The average mercury concentration for the permit term is 6.47 ng/L with a maximum
concentration of 9.6 ng/L. Both the analytical results collected for the Form 2C permit renewal
applications and the quarterly average are below the TBEL. Duke requests removal of the
monitoring requirement for total mercury.
6. Removal of iron monitoring requirement. Historical data demonstrates that the iron levels are
influenced by the level of iron concentration in the upstream intake water from the Dan River.
Duke requests removal of the monitoring requirement for total iron.
7. Footnote 3 and the associated temperature parameter are remnants from the coal-fired steam
station, now demolished. Duke requests that the terms found in footnote 3 be removed from
the permit as they are not applicable and replaced with thermal mixing zone.
Basis of Request—Footnote 3 originates from the EPA nomograph from 1976 as the basis
for the restrictions to protect aquatic life from cold shock due to the thermal load from
the retired Dan River Fossil Steam Station. This was first approved by North Carolina
DENR in 1993. Additional delta T thermal limits, as noted in Footnote 3, are based upon
EPA nomograph (USEPA 1976) and intended to protect warm water fish from cold shock
in the event of a winter season plant shut-down event. Historically, fossil steam stations
could operate units separately,thus varying discharge flow and heat load to the receiving
stream. If all units functioned either on one control unit or as autonomous units, this
configuration could have impacts on the receiving stream if all units were shutdown at
once versus scaled over time. Basically,if all steam units were online,withdrawing water,
heating it, and then discharging the heated effluent, losing all units at once would cause
a shock to the receiving stream and the aquatic life surrounding the discharge point. The
thermal rise calculation paired with the control unit designation seeds to regulate the
potential thermal shock of losing one or multiple operating units.
Combined cycle plants discharge significantly less heated effluent, i.e. approximately 0.6
MGD compared to 170+ MGD, than the demolished steam station, and have cooling
towers that help regulate the effluent discharge temperature.
8. Removal of pH limit and monitoring from internal outfall OO1A as done in previous Duke
Energy permits.
Outfall 001A is an internal outfall that discharges to the cooling tower and mixes with
approximately 0.6 MGD of cooling water and should be considered a contributing flow to outfall

001. Duke requests the removal of the pH monitoring requirement for this internal outfall due
to the pH limit of 6.0 to 9.0 at the point of discharge/end of pipe at outfall 001 which provides
protection of water quality.
9. Remove permit conditions no longer applicable. The excavation of the ash ponds was completed
in accordance with the North Carolina Coal Ash Management Act(CAMA)of 2014, HB 630 of 2016,
and the Senate Bill 716; Mountain Energy Act of 2015. Both dams have been razed and remaining
remnants are of low hazard reclaimed status and exempt from the Dam Safety Law of 1967. Duke
requests removal of the following conditions associated with operation of the former ash
ponds.
1. Conditions A (3) and A (4)—Monitoring Requirements for Outfall 002
2. Conditions A (5), A(6), and A (7)—Constructed Seeps-Outfalls 102, 103, and 104. Discharge
from the seeps ceased in May 2019
3. Condition A(10)—Chronic Toxicity Limit for Outfall 002
4. Condition A(14)—Structural Integrity Inspections of the Ash Pond Dam
5. Condition A(15)—Instream Monitoring
6. Condition A(16)—Applicable State Law-Senate Bill 729
7. Condition A(19)—Discharge From Seepage
8. Condition A(20)—Fish Tissue Monitoring Near Ash Pond Discharge (Outfall 002)
10. Include new Thermal mixing zone and remove 316(a)variance. Condition A (12) -Thermal
Mixing Variance—Duke Energy contracted with Water Environmental Consultants to model the
discharge from the Outfall 001. The model used multiple conservative values and shows that
the wastewater from Outfall 001 will readily mix with the receiving water. Based on the model
results, Duke requests that Outfall 001 be limited to a daily maximum limit of 99°F and a
thermal mixing zone in accordance with the modeled area of the enclosed thermal mixing zone
report be included in the renewed permit. The model indicates that the 99°F discharge will mix
with the river, and the instream water quality standard of 84.2°F will be met 134 feet
downstream of Outfall 001.
11. Condition A(13)—The 316(b) compliance report is included with this application.
12. Condition A(17)—The domestic sewage package plant was removed from service and replaced
with a septic system with drain field. Duke requests removal of this condition.
Duke Energy requests notification that this application is complete.
Should you have any questions regarding this submittal or require additional information, please contact
Joyce Dishmon at 336-623-0238 or email [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 thosepersons directlyresponsiblefor gatheringthe
9 Y p
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

Sincerely,
Terry Tuck
GM II—Regulated Stations
Dan River Combined Cycle
Attachments
Cc: Lon Snider—WSRO,450 West Hanes Mill Road, Suite 300, Winston-Salem, NC 27105
Joyce Dishmon/Filenet-via email
Willam Milam—via email
Shannon Langley—via email

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD024668535 NC0003468 Dan River Combined Cycle 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
Is the facility a new or existing publicly owned Is the facility a new or existing treatment works
1.1.1 1
treatment works? 1. .2 treating domestic sewage?
If yes, STOP. Do NOT complete 0 No If yes, STOP. Do NOT El 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 iO3
a production facility? currently discharging process wastewater?
oElYes 4 Complete Form 1 0 No 0 Yes 4 Complete Form El No
and Form 2B. 1 and Form 2C.
R 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
commenced to discharge? discharges only nonprocess wastewater?
c ❑ Yes 4 Complete Form 1 ✓0 No ❑ Yes 4 Complete Form 0 No
and Form 2D. 1 and Form 2E.
N
1.2.5 Is the facility a new or existing facility whose
discharge is composed entirely of stormwater
a associated with industrial activity or whose
discharge is composed of both stormwater and
non-stormwater?
El Yes 4 Complete Form 1 ❑✓ No
and Form 2F
unless exempted by
40 CFR
122.26(b)(14)(x)or
b 15 .
SECTION 2.NAME,MAILING ADDRESS,AND LOCATION(40 CFR 122.21(f)(2))
2.1 Facility Name
Dan River Combined Cycle Station
2.2 EPA Identification Number
.173
NCD024665535
2.3 Facility Contact
Name(first and last) Title Phone number
v Terry Tuck GM II-Regulated Stations [phone]
Email address
[e-mail]
2.4 Facility Mailing Address
CO Street or P.O.box
864 South Edgewood Road
City or town State ZIP code
Eden NC 27288
EPA Form 3510-1(revised 3-19) Page 1

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD024668535 NC0003468 Dan River Combined Cycle OMB No.2040 0004
tic g 2.5 Facility Location
.a . Street,route number,or other specific identifier
Q o 864 South Edgewood Road
U
c c County name County code(if known)
2 tc1) Rockingahm 079
City or town State ZIP code
z Eden NC 27288
SECTION 3.SIC AND NAICS CODES(40 CFR 122.21(f)(3))
3.1 SIC Code(s) Description(optional)
4911 Electric Services
y
o
0
0
U
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U
Z 3.2 NAICS Code(s) Description(optional)
v
221112 Fossil Fuel Electric Power Generation
U
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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?
€ ElYes ❑ No
4.3 Operator Status
� ❑ Public—federal ❑ Public—state ❑ Other public(specify)
ElPrivate ❑ Other(specify)
4.4 Phone Number of Operator
[phone]
4.5 Operator Address
Street or P.O. Box
864 South Edgewood Road
o
w City or town State ZIP code
,o v Eden NC 27288
co
Email address of operator
[e-mail]
SECTION 5.INDIAN LAND(40 CFR 122.21(f)(5))
F c 5.1 Is the facility located on Indian Land?
c ❑Yes ✓❑ No
EPA Form 3510-1(revised 3-19) Page 2

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD024668535 NC0003468 Dan River Combined Cycle 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)
a m NPDES(discharges to surface m RCRA(hazardous wastes) ❑ UIC(underground injection of
c water) fluids)
NC0003468 NCD024668535
w` t ✓❑ PSD(air emissions) 0 Nonattainment program(CM) ❑ NESHAPs(CM)
03455730 Title V Air
w ❑ Ocean dumping(MPRSA) 0 Dredge or fill(CWA Section 404) ✓❑ Other(specify)
NCS000572-ISW;IUP-1013
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
ao specific requirements.)
2
✓❑Yes ❑ No 0 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.
Natural Gas Fired Electric Generation
U)
U)
a)
.7)
m
O
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
rn:
40 CFR 125,Subparts I and J may have additional application requirements at 40 CFR 122.21(r). Consult with your
cY NPDES permitting authority to determine what specific information needs to be submitted and when.)
o „
Dan River
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
apply.Consult with your NPDES permitting authority to determine what information needs to be submitted and
when.)
❑ Fundamentally different factors(CWA ❑ Water quality related effluent limitations(CWA Section
e Section 301(n)) 302(b)(2))
❑ Non-conventional pollutants(CWA ✓❑ Thermal discharges(CWA Section 316(a))
Section 301(c)and(g))
❑ Not applicable
EPA Form 3510-1(revised 3-19) Page 3

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD024668535 NC0003468 Dan River Combined Cycle 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
0 Section 1:Activities Requiring an NPDES Permit ❑ w/attachments
✓❑ Section 2:Name,Mailing Address,and Location ❑ w/attachments
✓❑ Section 3: SIC Codes ❑ wl attachments
✓❑ Section 4:Operator Information ❑ w/attachments
O Section 5: Indian Land ❑ w/attachments
0 Section 6: Existing Environmental Permits ❑ w/attachments
w/topographic
❑✓ Section 7: Map ✓❑ ❑ w/additional attachments
o map
o ✓❑ Section 8: Nature of Business ❑ wl attachments
co
w ❑✓ Section 9: Cooling Water Intake Structures ✓❑ wl attachments
✓❑ Section 10:Variance Requests ✓❑ wl attachments
� El Section 11:Checklist and Certification Statement El w/attachments
d 11.2 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
Terry Tuck GM II-Regulated Stations
Signature Date signed
112-61Lo
EPA Form 3510-1(revised 3-19) Page 4

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD024668535 NC0003468 Dan River Combined Cycle 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.
NumberOutfal
l
coReceiving Water Name Latitude Longitude
0
001 Dan River 36° 29' 7.9" N -79° 43' 13.96" W
O
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
c 3 balance?(See instructions for drawing requirements. See Exhibit 2C-1 at end of instructions for example.)
J R
✓❑ 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
Cooling Tower Blowdown 0.8 mgd
°i Plant Collection Sumps 0.3 mgd
E
co
as
Low Volume Wastewater(OWS) 0.01 mgd
mgd
LL
Treatment Units
.3) Code from Final Disposal of Solid or
(include size,flow rate through each treatment unit, Table 2C-1 Liquid Wastes Other Than
a retention time,etc.) by Discharge
Clarification and Filtration 1-G Landfill
Ultrafiltration,Reverse Osmosis, 1-S,2-J
Oil/Water Separator 2-K
EPA Form 3510-2C(Revised 3-19) Page 1

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD024668535 NC0003468 Dan River Combined Cycle OMB No.2040-0004
3.1 **Outfall Number**
cont. Operations Contributing to Flow
Operation Average Flow
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
d
c
0
v
m
E
0)
a,
_ **Outfall Number**
Operations Contributing to Flow
Operation Average Flow
U
a, 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
3.2 Are you applying for an NPDES permit to operate a privately owned treatment works?
W ❑ Yes ❑✓ No 4 SKIP to Section 4.
cn 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
NCD024668535 NC0003468 Dan River Combined Cycle 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 3 SKIP to Section 5.
4.2 Provide information on intermittent or seasonal flows for each applicable outfall.Attach additional pages,if necessary.
Outfall Operation Frec,uency Flow Rate
Number (list) Average Average Long-Term Maximum Duration
DayslWeek Months/Year Average Daily
days/week months/year mgd mgd days
days/week months/year mgd mgd days
days/week months/year mgd mgd days
E m days/week months/year mgd mgd days
days/week months/year mgd mgd days
days/week months/year mgd mgd days
days/week months/year mgd mgd days
days/week months/year mgd mgd days
days/week months/year mgd 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 Q No 4 SKIP to Section 6.
5.2 Provide the following information on applicable ELGs.
w ELG Category ELG Subcategory Regulatory Citation
a)
d
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
R 5.4 Provide an actual measure of daily production expressed in terms and units of applicable ELGs.
J Outfall Operation,Product,or Material Quantity per Day Unit of
Number Measure
a)
co
co
U
'a
O
a`
EPA Form 3510-2C(Revised 3-19) Page 3

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD024668535 NC0003468 Dan River Combined Cycle 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 4 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
number)
E
Co
Co
rn
CL
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 Outfall Number Outfall Number
7.3 Have you completed monitoring for all Table A pollutants at each of your outfalls for which a waiver has not been
requested and attached the results to this application package?
.70
El Yes ❑ No;a waiver has been requested from my NPDES
permitting authority for all pollutants at all outfalls.
f Table B.Toxic Metals,Cyanide,Total Phenols,and Organic Toxic Pollutants
R 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.)
❑✓ 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 applicable primary industry categories and check the boxes indicating the required GC/MS fraction(s)identified
in Exhibit 2C-3.
Primary Industry Category Required GC/MS Fraction(s)
(Check applicable boxes.)
Electric Power Plants 0 Volatile 0 Acid 0 Base/Neutral 0 Pesticide
0 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
NCD024668535 NC0003468 Dan River Combined Cycle 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?
✓❑ Yes 0 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
-o then SKIP to Item 7.12.
w
= 7.11 Have you provided(1)quantitative data for those Sections 2 through 5,Table B,pollutants for which you have
= through Table
orquantitative data or an explanation for those Sections 2 th ou 5, B,
c determined testing is required (2) 9
Present"in your discharge?
CI)
pollutants you have indicated are"Believed g
❑ Yes ❑ No
;; 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
r for all outfalls?
✓❑ Yes
❑ No
7.13 Have you completed Table C by providing(1)quantitative data for those pollutants that are limited either directly or
(2)quantitative data or an explanation for those pollutants for which you have indicated
indirectlyin an ELG and/or
= P
"Believed Present"?
❑✓ Yes ❑ No
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 El 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
an intermediate or final product or byproduct?
❑ Yes ✓❑ No 4 SKIP to Section 9.
8.2 List the pollutants below.
1. 4. 7.
0
2. 5. 8.
sn
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
NCD024668535 NC0003468 Dan River Combined Cycle 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.
9.2 Identify the tests and their purposes below.
Test(s) Purpose of Test(s) Submitted to NPDES Date Submitted
Permitting Authority?
f-
Ceriodaphnia Chronic NPDES Permit ✓❑ Yes ❑ No 06/21/2019
co Effluent Bioassy Requirement-Outfall 002
°
in ❑ 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.
Laboratory Number 1 Laboratory Number 2 Laboratory Number 3
Name of laboratory/firm Duke Energy Analytical Pace Analytical Services,LLC
Laboratory (formerly Shealy Environmental
enNC#248 Services,Inc.)NC#329
en
Laboratory address 13339 Hagers Ferry Road 106 Vantage Point Drive
es
Huntersville,NC 28078-7929 West Columbia,SC 29172
co
ea
° Phone number
[phone] [phone]
Pollutant(s)analyzed Metals,TOC,Ammonia,Oil& BOD,COD,PCBs,Sulfide,
Grease,Fluoride,Sulfate, Sulfite,Semi-Volatiles,
Bromide,Nitrate-Nitrite, Volatiles,TSS,Fecal Coliform,
TKN,Total Phosphorus Color,Cyanide,Mercury,
Surfactants,pH,TRC,
Temperature,Phenol
SECTION 11.ADDITIONAL INFORMATION(40 CFR 122.21(g)(13))
11.1 Has the NPDES permitting authority requested additional information?
❑ Yes ✓❑ No -4 SKIP to Section 12.
0
11.2 List the information requested and attach it to this application.
0
1. 4.
0
2. 5.
-0
3. 6.
EPA Form 3510-2C(Revised 3-19) Page 6

Permit Number FacilityName Form Approved 03/05/19
EPA Identification Number NPDES a PP
NCD024668535 NC0003468 Dan River Combined Cycle 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
✓❑ Section 1:Outfall Location ✓❑ w/attachments
✓0 Section 2: Line Drawing ✓❑ w/line drawing ❑ w/additional attachments
Section 3:Average Flows and w/list of each user of
✓❑ Treatment ❑ w/attachments ❑ privately owned treatment
works
El Section 4: Intermittent Flows ❑ w/attachments
❑ Section 5: Production ❑ w/attachments
w/optional additional
❑ Section 6: Improvements ❑ w/attachments ❑ sheets describing any
additional pollution control
plans
❑ w/request for a waiver and ❑ w/explanation for identical
supporting information outfalls
❑ w/small business exemption El w/other attachments
a, request
❑ Section 7: Effluent and Intake ✓❑ w/Table A ❑✓ wl Table B
Characteristics
0
4 ✓❑ w/Table C ❑✓ w/Table D
d ✓❑ w/Table E ❑ w/analytical results as an
c� attachment
c ❑ Section 8: Used or Manufactured ❑ w/attachments
y Toxics
❑ Section 9:Biological Toxicity ❑ w/attachments
Tests
c.)
✓❑ Section 10:Contract Analyses ❑ w/attachments
El Section 11:Additional Information ❑ w/attachments
✓❑ Section 12:Checklist and ❑ w/attachments
Certification Statement
12.2 Certification Statement
1 certify under penalty of law that this document and all attachments were prepared under my direction or supervision in
accordance with a system designed to assure that qualified personnel properly gather and evaluate the information
submitted. Based on my inquiry of the person or persons who manage the system,or those persons directly
responsible for gathering the information,the information submitted is,to the best of my knowledge and belief,true,
accurate, and complete.1 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
Terry Tuck GM II-Regulated Stations
Signature Date signed
tom), d-��iC Sl L$lZ o L
EPA Form 3510-2C(Revised 3-19) Page 7

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD024668535 NC0003468 Dan River Combined Cycle Station 001 OMB No.2040-0004
TABLE A.CONVENTIONAL AND NON CONVENTIONAL POLLUTANTS(40 CFR 122.21(g)(7)(iii))1
Effluent Intake
Waiver (Optional)
Pollutant Requested Units Maximum Maximum Long-Term
(if applicable
te (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' ❑
(BODS) Mass lbs/day <6.7 1
Chemical oxygen demand Concentration mg/L 22 1 22 1
2' ❑
(COD) Mass lbs/day 73.4 1
Concentration mg/L 8.0 1 8.0 1
3. Total organic carbon(TOC) 0
Mass lbs/day 26.7 1
Concentration mg/L <2.5 1 <2.5 1
4. Total suspended solids(TSS) 0
Mass lbs/day 8.34 1
Concentration mg-N/L 0.031 1 0.031 1
5. Ammonia(as N) 0
Mass lbs/day 0.003 1
6. Flow 0 Rate 0.4 MG 0.4 1
Temperature(winter) ❑ °C °C 26.0 1
7. -
Temperature(summer) 0 °C °C
pH(minimum) ❑ Standard units S.U. 6.4 1
8.
pH(maximum) 0 Standard units s.u.
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

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD024668535 NC0003468 Dan River Combined Cycle 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 Average Number Long Number
Present Absent Daily Monthly Term
Daily of of
(required)
Discharge erd) (if available) Discharge Analyses Averageischarge Value Analyses
(if available)
0 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 Concentration ug/L 7.5 1 7.5 1
(7440-36-0) Mass lbs/day 0.02 1
Arsenic,total Concentration ug/L <1 1 <1 1
1.2 I=1 El
(7440-38-2) Mass lbs/day <0.003 1
Beryllium,total Concentration ug/L <1 1 <1 1
1.3 El I=1 El
(7440-41-7) Mass lbs/day <0.003 1
Cadmium,total Concentration ug/L <0.1 1 <0.1 1
1.4 El El
(7440-43-9) Mass lbs/day <0.0003 1
1.5 Chromium,total El Concentration ug/L 1.13 1 1.13 1
1:1 El
(7440-47-3) Mass Ibs/day 0.004 1
1.6 Copper,total 0 Concentration ug/L 63 1 63 1
1:1 El(7440-50-8) Mass Ibs/day 0.21 1
1.7 Lead,total Concentration ug/L <1 1 <1 1
(7439-92-1) Mass lbs/day <0.003 1
1.8 Mercury,total Concentration ng/L 4.30 1 4.30 1
0 0 0
(7439-97-6) Mass lbs/day 0.00001 1
1 9 Nickel,total Concentration ug/L 1.63 1 1.63 1
El El
(7440-02-0) Mass lbs/day 0.005 1
1.10 Selenium,total 12 Concentration ug/L <1 1 <1 1
D El
(7782-49-2) Mass lbs/day <0.003 1
Silver,total0 Concentration ug/L <1 1 <1 1
1.11 ID El
(7440-22-4) Mass lbs/day <0.003 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
NCD024668535 NC0003468 Dan River Combined Cycle 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 Average Number Long-
Number
Present Absent Daily Monthly Daily of Term of
Discharge Discharge Discharge Analyses AValuee Analyses
(required) (if available)
(if available)
1.12 Thallium,total 0Concentration ug/L <0.2 1 <0.2 1
El 0
(7440-28-0) Mass lbs/day <0.0006 1
1.13 Zinc,total 0Concentration mg/L 0.017 1 0017 1
(7440-66-6) Mass lbs/day 0.06 1
1.14 Cyanide,total Concentration mg/L <0.01 1 <0.01 1
(57-12-5) Mass lbs/day <0.04 1
1.15 Phenols,total 0Concentration Ug/L <1.6 1 <1.6 1
Mass lbs/day <0.005 1
Section 2.Organic Toxic Pollutants(GC/MS Fraction-Volatile Compounds)
Acrolein ❑ Concentration ug/L <5.0 1 <5.0 1
0 El
2.1 (107-02-8) Mass lbs/day <0.02 1
I El Acrylonitrile0 ID Concentration ug/L <5.0 1 <5.0 1
2.2 (107-13-1) Mass lbs/day <0.02 1
2.3 Benzene 0Concentration ug/L <1.0 1 <1.0 1
El 0
(71-43-2) Mass lbs/day <0.003 1
Bromoform 0 Concentration ug/L <1.0 1 <1.0 1
2.4 0 0
(75-25-2) Mass lbs/day <0.003 1
2.5 Carbon tetrachloride 0
Concentration ug/L <1.0 1 <1.0 1
0 0
(56-23-5) Mass lbs/day <0.003 1
2.6 Chlorobenzene 0Concentration ug/L <1.0 1 <1.0 1
El 0
(108-90-7) Mass Lbs/day <0.003 1
Chlorodibromomethane ❑ Concentration ug/L <1.0 1 <1.0 1
2.7 El 0
(124-48-1) Mass lbs/day <0.003 1
2.8 Chloroethane ElConcentration ug/L <2.0 1 <2.0 1
0 0
(75-00-3) Mass lbs/day <0.007 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
NCD024668535 NC0003468 Dan River Combined Cycle 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 Average Number Long-
Number
Present Absent Daily Monthly Daily of Term of
Discha req i ed a Df available) Diischarge scharge Analyses AValuee Analyses
( ) ( (if available)
2-chloroethylvinyl ether Concentration ug/L <5.0 1 <5.0 1
2'9 0 El El
(110-75-8) Mass lbs/day <0.02 1
2.10 Chloroform(67-66-3) Concentration ug/L 7.2 1 7.2 1
Mass lbs/day 0.02 1
2.11 Dichlorobromomethane 0 Concentration ug/L <1.0 1 <1.0 1
El El
(75-27-4) Mass lbs/day <0.003 1
212 1,1-dichloroethane 0 Concentration ug/L <1.0 1 <1.0 1
(75-34-3) Mass lbs/dy <0.003 1
1,2-dichloroethane 0 Concentration ug/L <1.0 1 <1.0 1
2.13 (107-06-2) Mass lbs/day <0.003 1
2.14 1,1-dichloroethylene 0 Concentration ug/L <1.0 1 <1.0 1
(75-35-4) Mass lbs/day <0.003 1
2.15 1,2-dichloropropane 0 Concentration ug/L <1.0 1 <1.0 1
78-87-5
( ) Mass Lbs/day <0.003 1
2.16 1,3-dichloropropylene 0 Concentration ug/L <1.0 1 <1.0 1
(542-75-6) Mass lbs/day <0.003 1
2.17 Ethylbenzene Concentration ug/L <1.0 1 <1.0 1
(100-41-4) Mass lbs/day <0.003 1
2.18 Methyl bromide Concentration ug/L <2.0 1 <2.0 1
El El El
(74-83-9) Mass lbs/day <0.003 1
2.19 Methyl chloride D Concentration ug/L <2.0 1 <2.0 1
0 El
(74-87-3) Mass lbs/day <0.007 1
2.20 Methylene chloride 0 Concentration ug/L <1.0 1 <1.0 1
(75-09-2) Mass lbs/day <0.003 1
2.21 1,1,2,2-tetrachloroethane 0 Concentration ug/L <1.0 1 <1.0 1
0 0
(79-34-5) Mass lbs/day <0.003 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
NCD024668535 NC0003468 Dan River Combined Cycle 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 Average Number Long- Number
Present Absent Daily Monthly Daily of Term of
Dischverag
(reequi erdge Df available) Discharge Analyses ischarge AValuee Analyses
(if
2.22 Tetrachloroethylene 0Concentration ug/L <1.0 1 <1.0 1
0 El
(127-18-4) Mass lbs/day <0.003 1
2.23 Toluene ✓ Concentration ug/L <1.0 1 <1.0 1
(108-88-3) Mass lbs/day <0.003 1
2.24 1,2-trans-dichloroethylene ElConcentration ug/L <1.0 1 <1.0 1
(156-60-5) Mass lbs/day <0.003 1
2.25 1,1,1-trichloroethane ❑� Concentration ug/L <1.0 1 <1.0 1
(71-55-6) Mass lbs/day <0.003 1
2.26 1,1,2-trichloroethane ElConcentration ug/L <1.0 1 <1.0 1
(79-00-5) Mass lbs/day <0.003 1
2.27 Trichloroethylene ✓❑ Concentration ug/L <1.0 1 <1.0 1
0 El
(79-01-6) Mass lbs/day <0.003 1
2.28 Vinyl chloride a 0Concentration ug/L <1.0 1 <1.0 1
El
(75-01-4) Mass lbs/day <0.003 1
Section 3.Organic Toxic Pollutants(GCIMS Fraction-Acid Compounds)
3.1 2-chlorophenol Concentration ug/L <1.6 1 <1.6 1
(95-57-8) Mass lbs/day <0.005 1
3.2 2,4-dichlorophenol 1:1Concentration ug/L <1.6 1 <1.6 1
0 El
(120-83-2) Mass lbs/day <0.005 1
3.3 2,4-dimethylphenol ElConcentration ug/L <1.6 1 <1.6 1
1:1 El
(105-67-9) Mass lbs/day <0.005 1
3.4 4,6-dinitro-o-cresol ✓❑ Concentration ug/L <8.0 1 <8.0 1
(534-52-1) Mass lbs/day <0.03 1
-
3.5 2,4-dinitrophenol Concentration ug/L <8.0 1 <8.0 1
(51-28-5) Mass lbs/day <0.03 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
NCD024668535 NC0003468 Dan River Combined Cycle 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 Average Number Long• Number
Present Absent Daily Monthly Term
of of
Discharge Discharge Dis Daily
char a Analyses e Analyses
(required) (if available) g
(i Value
f available)
2-nitrophenol ElConcentration ug/L <3.2 1 <3.2 1
3.6 El ID
(88 75 5) Mass lbs/day <0.01 1
4-nitrophenol ❑ Concentration ug/L <8.0 1 <8.0 1
3.7 (100-02-7) Mass lbs/day <0.03 1
p-chloro-m-cresol Concentration ug/L <1.6 1 <1.6 1
3.8 (59-50-7) Mass lbs/day <0.005 1
Pentachlorophenol Concentration ug/L <8.0 1 <8.0 1
3'9 (87-86-5) Mass lbs/day <0.03 <0.03 1
Phenol 0 Concentration ug/L <1.6 1 <1.6 1
3.10 El El
(108-95-2) Mass lbs/day <0.005 1
3.11 2,4,6-trichlorophenol 0 Concentration ug/L <1.6 1 ' <1.6
El 0(88-05-2) Mass lbs/day <0.005 1 1
Section 4.Organic Toxic Pollutants(GC/MS Fraction-Base/Neutral Compounds)
4.1 Acenaphthene 0 Concentration ug/L <1.6 1 <1.6 1
I=1 El
(83-32-9) Mass lbs/day <0.005 1
Acenaphthylene El Concentration ug/L <1.6 1 <1.6 1
4.2 El 0
(208-96-8) Mass lbs/day <0.005 1
Anthracene Concentration ug/L <1.6 1 <1.6 1
4.3 El El El
(120-12-7) Mass lbs/day <0.005 1
4.4 Benzidine Concentration ug/L <8.0 1 <8.0 1
ID El El
(92-87-5) Mass lbs/day <0.03 1
Benzo(a)anthracene Concentration ug/L <1.6 1 <1.6 1
4.5 El El 1:1
(56-55-3) Mass lbs/day <0.005 1
4.6 Benzo(a)pyrene Concentration ug/L <1.6 1 <1.6 1
(50-32-8) Mass lbs/day <0.005 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
NCD024668535 NC0003468 Dan River Combined Cycle 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 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
Di ch a Discharge Di D harge Analyses AValuee Analyses
(required) (if available)
(if available)
3,4-benzofluoranthene ❑ Concentration ug/L <1.6 1 <1.6 1
4.7 El El
(205-99-2) Mass lbs/day <0.005 1
4.8 Benzo(ghi)perylene Concentration ug/L <1.6 1 <1.6 1
(191-24-2) Mass lbs.day <0.005 1
Benzo(k)fluoranthene Concentration ug/L <1.6 1 <1.6 1
4'9 ID 1:1 El
(207-08-9) Mass lbs/day <0.005 1
Bis(2-chloroethoxy)methane ci Concentration ug/L <1.6 1 <1.6 1
4.10 (111-91-1) Mass lbs/day <0.005 1
Bis(2-chloroethyl)ether 0 Concentration ug/L <1.6 1 <1.6 1
4.11 1=1 El
(111-44-4) Mass lbs/day <0.005 1
4.12 Bis(2-chloroisopropyl)ether 0 Concentration ug/L <1.6 1 <1.6 1
El El(102-80-1) Mass lbs/day <0.005 1
4.13 Bis(2-ethylhexyl)phthalate 1=1 Concentration ug/L <8.0 1 <8.0 1
(117-81-7) Mass lbs/day <0.03 1
4-bromophenyl phenyl ether 0 Concentration ug/L <1.6 1 <1.6 1
4.14 1:1 El
(101-55-3) Mass lbs./ay <0.005 1
4.15 Butyl benzyl phthalate 0 Concentration ug/L <1.6 1 <1.6 1
(85-68-7) Mass lbs/day <0.005 1
4.16 2-chloronaphthalene 0 Concentration ug/L <1.6 1 <1.6 1
El El
(91-58-7) Mass lbs/day <0.005 1
4-chlorophenyl phenyl ether 0El El Concentration ug/L <1.6 1 <1.6 1
4.17 (7005-72-3) Mass lbs.day <0.005 1
4.18 Chrysene 0 Concentration ug/L <1.6 1 <1.6 1
1:1 El(218-01-9) Mass lbs/day <0.005 1
4.19 Dibenzo(a,h)anthracene 0 Concentration ug/L <1.6 1 <1.6 1
El El
(53-70-3) Mass lbs/day <0.005 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
NCD024668535 NC0003468 Dan River Combined Cycle 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 Average Number Long Number
Present Absent
Daily Monthly Term
of of
Discharge Discharge DisDcharge Analyses Average Analyses
(required) (if available) Value
(if available)
4.20 1,2-dichlorobenzene ✓❑ Concentration ug/L <1.0 1 <1.0 1
El El
(95-50-1) Mass lbs.day <0.003 1
1,3-dichlorobenzene Concentration ug/L <1.0 1 <1.0 1
4.21 El
(541-73-1) 1=I El Mass lbs/day <0.003 1
1,4-dichlorobenzene ❑ Concentration ug/L <1.0 1 <1.0 1
4.22 El El
(106-46-7) Mass lbs/day <0.003 1
4.23 3,3-dichlorobenzidine 0Concentration ug/L <8.0 1 <8.0 1
El El
(91-94-1) Mass lbs/day <0.03 1
4.24 Diethyl phthalate El © Concentration ug/L <1.6 1 <1.6 1
(84-66-2) Mass lbs./ay <0.005 1
4.25 Dimethyl phthalate 0Concentration ug/L <1.6 1 <1.6 1
IEI El
(131-11-3) Mass lbs./ay <0.005 1
4.26 Di-n-butyl phthalate El El0Concentration ug/L <1.6 1 <1.6 1
(84-74-2) Mass lbs/day <0.005 1
4.27 2,4-dinitrotoluene El © Concentration ug/L <3.2 1 <3.2 1
El
(121-14-2) Mass lbs/day <0.01 1
4.28 2,6-dinitrotoluene 0Concentration ug/L <3.2 1 <3.2 1
El El
(606-20-2) Mass lbs/day <0.01 1
4.29 Di-n-octyl phthalate 0 Concentration ug/L <1.6 1 <1.6 1
El El
(117-84-0) Mass lbs/day <0.005 1
4.30 1,2-Diphenylhydrazine 0 Concentration ug/L <1.6 1 <1.6 1
El El
(as azobenzene)(122-66-7) Mass lbs/day <0.005 1
4.31 Fluoranthene 0 Concentration ug/L <1.6 1 <1.6 1
El El(206-44-0) Mass lbs/day <0.005 1
4.32 Fluorene 0 Concentration ug/L <1.6 1 <1.6 1
El El 1
(86-73-7) Mass lbs/day <0.005 1
EPA Form 3510-2C(Revised 3-19) Page 17
1

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD024668535 NC0003468 Dan River Combined Cycle 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 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 Daily of Term of
Discharge Discharge Discharge Analyses Average Analyses
(required) (if available) Value
(if available)
Hexachlorobenzene ❑ Concentration ug/L <1.6 1 <1.6 1
4.33 El 1:1
(118-74-1) Mass lbs/day <0.005 1
4.34 Hexachlorobutadiene El0Concentration ug/L <1.6 1 <1.6 1
El
(87-68-3) Mass lbs/day <0.005 1
4.35 Hexachlorocyclopentadiene 0Concentration ug/L <8.0 1 <8.0 1
(77-47-4) Mass lbs/day <0.03 1
4.36 Hexachloroethane � ❑ Concentration ug/L <1.6 1 <1.6 1
(67-72-1) Mass lbs/day <0.005 1
4.37 Indeno(1,2,3-cd)pyrene 0Concentration ug/L <1.6 1 <1.6 1
l=I El
(193-39-5) Mass lbs/day <0.005 1
4.38 Isophorone El ✓o Concentration ug/L <1.6 1 <1.6 1
(78-59-1) Mass lbs/day <0.005 1
4.39 Naphthalene 0Concentration ug/L <1.6 1 <1.6 1
(91-20-3) Mass lbs/day <0.005 1
4.40 Nitrobenzene 0Concentration ug/L <1.6 1 <1.6 1
(98-95-3) Mass lbs/day <0.005 1
N-nitrosodimethylamine 0 Concentration ug/L <1.6 1 <1.6 1
4.41 (62-75-9) Mass lbs/day <0.005 1
4.42 N-nitrosodi-n-propylamine 1:1Concentration ug/L <1.6 1 <1.6 1
(621-64-7) Mass lbs.day <0.005 1
4.43 N-nitrosodiphenylamine ✓❑ Concentration ug/L <1.6 1 <1.6 1
(86-30-6) Mass lbs/day <0.005 1
4.44 Phenanthrene 00Concentration ug/L <1.6 1 <1.6 1
(85-01-8) Mass lbs.day <0.005 1
4.45 Pyrene El El
ug/L <1.6 1 <1.6 1
(129-00-0) Mass lbs/day <0.005 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
NCD024668535 NC0003468 Dan River Combined Cycle 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 Average Number Long- Number
Daily Monthly Term
Present Absent Daily of of
Discharge (id) favailabl) Diischarge scharge Analyses AValuee Analyses
requi (if available)
4.46 1,2,4-trichlorobenzene 0Concentration ug/L <1.6 1 <1.6 1
El 0
(120-82-1) Mass lbs/day <0.005 1 <0.005 1
Section 5.Organic Toxic Pollutants(GC/MS Fraction—Pesticides)
5.1 Aldrin � Concentration
0 El(309-00-2) ✓ Mass
a-BHC o Concentration
5.2 El El
(319-84-6) Mass
R-BHC 0 Concentration
5.3 (319-85-7) Mass
y-BHC Concentration
5.4 (58-89-9) � ❑ Mass
6-BHC 0 Concentration
5.5 (319-86-8) Mass
5.6 Chlordane Concentration
0 El
(57-74-9) ✓
Mass
5.7 4,4'-DDT � Concentration
0 0
(50-29-3) ✓ Mass
4,4'-DDE Concentration
5.8 0(72-55-9) Mass
5.9 4,4'-DDD Concentration
El El 0
(72-54-8) Mass
5.10 Dieldrin Concentration
El 0
(60-57-1) ✓ Mass
a-endosulfan 0 Concentration
5.11 El El
(115-29-7) 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
NCD024668535 NC0003468 Dan River Combined Cycle Station 001 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHBJOLS,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 Daily of Term of
Discharge Discharge Discharge Analyses AValuee Analyses
(required) (if available)
(if available)
5.12 R-endosulfan El0 Concentration
(115-29-7) Mass
Endosulfan sulfate Concentration
5.13 (1031-07-8) Mass
5.14 Endrin Concentration
(72-20-8) Mass
Endrin aldehyde 0 Concentration
5.15 (7421-93-4) Mass
5.16 Heptachlor Concentration
El 0
(76-44-8) 0 Mass
Heptachlor epoxide Concentration
5.17 (1024-57-3) 0 CI 0 Mass
PCB-1242 Concentration ug/L <0.4 1 <0.4 1
5.18 (53469-21-9) 0 Mass lbs/day <0.001 1
PCB-1254 Concentration ug/L <0.4 1 <0.4 1
5.19 (11097-69-1) 0 0 0Mass lbs/day <0.001 1
PCB-1221 Concentration ug/L <0.4 1 <0.4 1
5.20 (11104-28-2) 0 0 0
Mass lbs/day <0.001 1
PCB-1232 Concentration ug/L <0.4 1 <0.4 1
5.21 (11141-16-5) 0 El 0 Mass lbs/day <0.001 1
PCB-1248 Concentration ug/L <0.4 1 <0.4 1
5.22 (12672-29-6) 0 0 0
Mass lbs/day <0.001 1
PCB-1260 Concentration ug/L <0.4 1 <0.4 1
5.23 (11096-82-5) 0 0 Mass lbs/day <0.001 1
PCB-1016 Concentration ug/L <0.4 1 <0.4 1
5.24 (12674-11-2) 0 0 Mass lbs/day <0.001 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
NCD024668535 NC0003468 Dan River Combined Cycle 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 Average Number Long- Number
Present Absent Daily Monthly Daily of Term of
Discharge(eq i e Discharge
(if available) Discharge Analyses AverageValue Analyses
(if available)
Toxaphene Concentration
5.25 (8001-35-2) 0 0 0 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

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD024668535 NC0003468 Dan River Combined Cycle 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
Present Absent Discharge Monthly Average Daily Number of Average Number of
(required) Discharge Discharge Analyses Analyses
(if available) (if available) Value
1-1
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 0.98 1 0.98 1
(24959-67-9) El El Concentration
lbs/day 3.3 1
2 Chlorine,total El El
mg/L <0.05 1 <0.05 1
residual Mass lbs/day <0.2 1
Concentration color units <5.0 1 <5.0 1
3. Color 0 ✓❑
Mass lbs/day NA 1
Concentration MPN/100 <1 1 <1 1
4. Fecal coliform ❑ ✓❑
Mass lbs/day NA 1
5 Fluoride ❑ Concentration mg/L <0.5 1 <0.5 1
(16984-48-8) ✓ Mass lbs/day <2 1
6 Nitrate nitrite ID
mg-N/L 2.2 1 2.2 1
Mass lbs/day 7.34 1
Nitrogen,total El ❑ Concentration mg-N/L 0.62 1 0.62 1
7. organic(as N) Mass lbs/day 2.07 1
Concentration mg/L <5 1 <5.0 1
8. Oil and grease ❑ ✓❑
Mass mg/L <16.8 1
g Phosphorus(as Concentration mg-P/L 1.62 1 1.62 1
P),total(7723-14-0) El El
lbs/day 5.40 1
10. Sulfate(as SO4) ❑✓ ❑ Concentration mg/L 52 1 52 1
(14808-79-8) Mass lbs/day 174.72 1
Concentration mg/L <1.0 1 <1.0 1
11. Sulfide(as S) 0 0
Mass lbs/day <0.003 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
NCD024668535 NC0003468 Dan River Combined Cycle 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 DailyLong-Term
Present Absent Discharge Monthly Average Daily Number of Average Number of
Discharge Discharge Analyses Analyses
(required) Value
(if available) (if available)
Sulfite(as SO3) Concentration mg/L 2.5 1 2.5 1
12. (14265-45-3) Mass lbs./ay 8.34 1
13. Surfactants Concentration mgMBAS/ 0.079 1 0.079 1
Mass lbs/day 0.26 1
14 Aluminum,total Concentration mg/L 0.067 1 0.067 1
1:1 El
(7429-90-5) Mass lbs/day 0.22 1
15. Barium,total El ❑ Concentration mg/L 0.078 1 0.078 1
(7440-39-3) Mass lbs/day 0.26 1
16. Boron,total 0 0 Concentration mg/L 0.095 1 0.095 1
(744042-8) Mass lbs/day 0.32 1
17 Cobalt,total Concentration ug/L <1 1 <1.0 1
0 El
(7440-48-4) Mass lbs/day <0.003 1
18. Iron,total ❑✓ ❑ Concentration mg/L 0.235 1 0.235 1
(7439-89-6) Mass lbs/day 0.78 1
19. Magnesium,total ✓E ❑ Concentration mg/L 11.4 1 11.4 1
(7439-95-4) Mass lbs/day 38.3 1
Molybdenum, Concentration ug/L 6.17 1 6.17 1
20. total 0 El(7439-98-7) Mass lbs/day 20.7 1
21. Manganese,total ❑ ❑� Concentration mg/L <0.005 1 <0.005 1
(7439-96-5) Mass lbs/day <0.02 1
22. Tin,total ❑ ❑ Concentration mg/L <0.01 1 <0.01 1
(7440-31-5) Mass lbs/day <0.03 1
23. Titanium,total 0 ❑✓ Concentration mg/L <0.005 1 <0.005 1
(7440-32-6) Mass lbs/day <0.02 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
NCD024668535 NC0003468 Dan River Combined Cycle 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
Present Absent Discharge Monthly Average Daily Number of Average Number of
Discharge Discharge Analyses Analyses
(required) Value
(if available) (if available)
24. Radioactivity
Concentration
Alpha,total El ❑✓
Mass
Concentration
Beta,total ❑ ✓❑ Mass
Radium,total ❑ ❑
Concentration
Mass
Concentration
Radium 226,total ❑ ❑� 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

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD024668535 NC0003468 Dan River Combined Cycle 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) Reason Pollutant Believed Present in Discharge Available Quantitative Data
Believed Believed (specify units)
Present Absent
1. Asbestos ❑ ❑
2. Acetaldehyde ❑ 0
3. Allyl alcohol ❑ E
4. Allyl chloride ❑ 0
5. Amyl acetate ❑ 0
6. Aniline ❑ 0
7. Benzonitrile ❑ 0
8. Benzyl chloride 0 0
9. Butyl acetate 0 ✓❑
10. Butylamine ❑ ✓❑
11. Captan El
12. Carbaryl 0 El
13. Carbofuran 0 0
14. Carbon disulfide ❑ ✓❑
15. Chlorpyrifos 0 ✓❑
16. Coumaphos ❑ ❑
17. Cresol ❑ ❑
18. Crotonaldehyde ❑ ❑
19. Cyclohexane ❑ ❑
EPA Form 3510-2C(Revised 3-19) Page 27

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD024668535 NC0003468 Dan River Combined Cycle 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) Reason Pollutant Believed Present in Discharge Available Quantitative Data
Believed Believed (specify units)
Present Absent
20. 2,4-D(2,4-dichlorophenoxyacetic acid) ❑ ✓❑
21. Diazinon ❑ ✓❑
22. Dicamba ❑ ❑�
23. Dichlobenil ❑ ✓❑
24. Dichlone 0 CI
25. 2,2-dichloropropionic acid ❑ ❑✓
26. Dichlorvos ❑ ❑
27. Diethyl amine ❑ ❑
28. Dimethyl amine ❑ ❑✓
29. Dintrobenzene ❑ ❑✓
30. Diquat ❑ ❑
31. Disulfoton 0 ✓❑
32. Diuron ❑ ✓❑
33. Epichlorohydrin ❑ ❑
34. Ethion 0 ✓❑
35. Ethylene diamine ❑ 0
36. Ethylene dibromide ❑ ✓❑
37. Formaldehyde 0 ✓❑
38. Furfural ❑ ✓❑
EPA Form 3510-2C(Revised 3-19) Page 28

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD024668535 NC0003468 Dan River Combined Cycle Station 001 OMB No.2040-0004
TABLE D.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 12221(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
39. Guthion ❑ 0
40. Isoprene ❑ 0
41. Isopropanolamine ❑ 0
42. Kelthane ❑ 0
43. Kepone ❑ 0
44. Malathion 0 0
45. Mercaptodimethur 0 0
46. Methoxychlor ❑ 0
47. Methyl mercaptan ❑ 0
48. Methyl methacrylate 0 0
49. Methyl parathion ❑ 0
50. Mevinphos ❑ 0
51. Mexacarbate 0 0
52. Monoethyl amine ❑ 0
53. Monomethyl amine ❑ 0
54. Naled ❑ 0
55. Naphthenic acid ❑ 0
56. Nitrotoluene 0 0
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
NCD024668535 NC0003468 Dan River Combined Cycle 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) 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 0 ✓❑
63. Quinoline 0 ✓❑
64. Resorcinol 0 ✓❑
65. Strontium 0 ✓❑
66. Strychnine 0 El
67. Styrene 0 ✓❑
68. 2,4,5-T(2,4,5-trichlorophenoxyacetic ❑ ✓❑
acid)
69. TDE(tetrachlorodiphenyl ethane) 0 ✓❑
70 2,4,5-TP[2-(2,4,5-trichlorophenoxy) ❑
propanoic acid]
71. Trichlorofon 0 0
72. Triethanolamine 0 ✓❑
73. Triethylamine ❑ ❑
74. Trimethylamine 0 ✓❑
75. Uranium 0 El
76. Vanadium 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
NCD024668535 NC0003468 Dan River Combined Cycle 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) Reason Pollutant Believed Present in Discharge Available Quantitative Data
Believed Believed (specify units)
Present Absent
77. Vinyl acetate 0 ✓❑
78. Xylene ❑ ❑
79. Xylenol 0 ❑✓
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

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD024668535 NC0003468 Dan River Combined Cycle 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 0 0 0
EPA Form 3510-2C(Revised 3-19) Page 33

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— ,* I _ _ Duke Energy Parcel
4.*'
Outfall #: 001
Receiving Stream: Dan River Duke Energy Carolinas, LLC
Latitude: 36°29' 7.9" N NC0003468
Longitude: 79°43' 13.96"W Dan River Combined
Cycle Station
Outfall #: 001A
Receiving Stream: Dan River Facility Location
Latitude: 36°29' 26.22" N 0 1,000 2,000 4,000
Feet
Longitude: 79°43' 14.34"W

EVAPORATIVE
LOSS WATER SUPPLY 3GPM 9 GPM
m —1110 CONDENSER PIP POTABLE USERS 0 SEPTIC SYSTEM
MUNICIPAL
po
COOLING TOWER 0
400 GPM
DRI+FT / CLOSED COOLING
55 GPM
g BLOW DOWN , 37GPM
' SUMP
EVAPORATIVE
DEMIN CLEANING A
LOSS CHILLER COIL WASTE
I CONDENSATE NEUTRALIZATION v v
TANK
A EVAPORATIVE
v v CHILLER SYSTEM , 60GPM 20GPM mrLO?SS
l
72 GPM , FILTERED WATER 77 GPM , ULTRA- 77 GPM , REVERSE ss GPM1110 STORAGE TANK 55 GPM ' HRSG
STORAGE FILTRATION OSMOSIS
15 GPM IF 20 GPM ♦ 25 GPM
g v L.,
0
MAINTENANCE ocPm POTABLE MIXED
DEMIN
HOLDING TANK 3 BED
TRAILER
A I
V 7 V
— J OIL SEPARATOR
4062 GPM MAKEUP I FIRE 5GPm • MISCELLANEOUS 70 GPM
CLARIFICATION I PROTECTION USES 1110 (DISCHARGE v ` PLANT SUMPS
/— — — — OUTFALL 001A)
5 GPM
v v v
V
SLUDGE OFF SITE
28 GPM , THICKENER 12 GPM 3GPM CT WASH
FILTER PRESS , TREATMENT/
DIS SAL 4 WATER
A A
40 GPM
V
DAN RIVER (OUTFALL 001
/ 0.6MGD
05 GPM ` CHILLER SYSTEM
SUMPS
DUKE ENERGY PROGRESS INC.
WATER SCHEMATIC FLOW DIAGRAM DAN RIVER COMBINED CYCLE
FIGURE 1 ROCKINGHAM COUNTY,NC
SHEET 1 OF 1 MARCH 2021

NPDES Supplemental Information
For
Dan River Combined Cycle Station
NPDES Permit # NC0003468
June 2021

General Information
The Dan River Combined Cycle (DRCC) Station consists of two General Electric 7FA gas turbine
generators with a General Electric D11 Steam Turbine. The nominal output for this facility is
rated for 620 MW. DRCC generates the process water used in the plant by treating water from
the Dan River. The facility pumps water from the Dan River via 3 raw water pumps to the Graver
clarifier. Coagulant (Ferralyte 8130/ferric sulfate), polymer (flocculant), sodium hydroxide (pH
control), and sodium hypochlorite (disinfection) are added to the raw water. Water from the
clarifier is further treated through gravity filters. The filtered water is stored in the Fire
Water/Service Water Tank for fire protection, makeup water to the HRSG, and/or various other
plant functions. All waste streams are either directly or indirectly routed back to the Dan River
or are hauled off site for disposal. A brief discussion of all the discharges follow.
Outfall 001—Combined Cycle Wastewater Sump Discharge
Outfall 001 is the gravity flow discharge of the DRCC wastewater sump to the Dan River and
consists of various wastewater streams. These wastewater streams include cooling tower
blowdown, oil and water separator (Internal Outfall 001A), ultrafiltration backwash, Reverse
Osmosis (RO)/portable demineralizer trailer rinse down, RO cleaning wastewater, and fire
(service) water/demineralizer tank overflow and drainage. All facility waste streams that are not
shipped offsite are discharged to the cooling tower and mixed prior to discharge through Outfall
001.
Cooling Tower Blowdown
Condenser cooling water (CCW) is supplied through filtered water sent to a ten-cell
cooling tower. The cooling tower basin contains approximately 1 million gallons of water.
This water is recirculated and cycled with approximately 5% make up added hourly to
account for blowdown and evaporation loss. Sodium hypochlorite is fed to the cooling
tower for disinfection/biological growth control, a dispersant/corrosion inhibitor is fed
for water chemistry parameter monitoring on the tower and corrosion inhibition, and a
small amount of defoaming agent is added to prevent foaming issues. A blowdown
stream averaging around 400 gpm is used to maintain concentration of total dissolved
solids in the cooling tower to within proper operating limits. Sodium bisulfite is fed into
the blowdown stream for chlorine removal prior to discharge to the DRCC wastewater
sump.

During cooling tower maintenance activities, the basin may have to be drained to various
level, including emptied. Depending on the activity, the basin may be partially or fully
routed through the blowdown line or through retention basins/tanks for dichlorination
prior to discharge at Outfall 001.
HRSG Blowdown
Heat recovery steam generator(HRSG) utilizes approximately 350,000 gallons per
day of filtered water drawn from the Service Water/Fire Water tank. In addition,
to clarification and filtration, the filtered water undergoes ultrafiltration, reverse
osmosis, and mixed bed demineralization. Ultrafiltration uses citric acid and
sodium hypochlorite. Reverse Osmosis utilizes an anti-scalant, sodium hydroxide
for pH control, and sodium bisulfite for dichlorination.
Demineralized water is stored in the demineralized water storage tank and further
treated with ammonium hydroxide for pH control, an oxygen scavenger, and
phosphate for corrosion inhibitor prior to use in the HRSG.
HRSG blowdown is sent to the cooling tower basin via various drains throughout
the station that are piped to the HRSG blowdown sump. Other wastestreams that
go to the HRSG blowdown sump include auxiliary boiler blowdown, Ultrafiltration
(UF) acid cleaning and bleach cleaning wastewater and (RO) concentrate.
Chiller Blowdown
The chiller system is utilized during the late spring and summer months to increase
power output of the gas turbines by cooling the incoming air. The chiller system
consists of a heat exchanger which provides an extended surface over which the
inlet air is cooled. The chilled water, mixture of 33% propylene glycol and water,
is supplied by a chiller plant which has a total system capacity of approximately
65,000 gallons. 2,000 gallons of refrigerant mixed with cooling water is utilized in
the chiller plant. The water in the chiller system is recirculated.
The cooling water side of the chiller system consists of approximately 20,000
gallons of clarified and filtered water that is treated with sodium hypochlorite for
biological control. A dispersant/corrosion inhibitor is used for water chemistry
parameter monitoring on the tower and corrosion inhibition. A blowdown stream
(chiller blowdown) of approximately 32 gpm is utilized to maintain water
chemistry within the tower at proper operating limits.
Small volumes of the chilled water (propylene glycol/water mixture) may be
discharged to the cooling tower basin via the chiller blowdown during

maintenance activities. Prior to the winter months, the cooling water side of the
chiller system is winterized utilizing approximately 150 gallons of a sodium
hydroxide based chemical which is pumped into the cooling water side of the
system, mixed with approximately 20,000 gallons of filtered water, circulated and
drained to the cooling tower basin.
Oil and Water Separator(Outfall 001A)
All powerhouse building floor drains and all outside oil filled equipment drains are
piped to an oil and water separator. A new oil and water separator was installed
in November of 2016. The discharge of the oil and water separate was routed to
the cooling tower basin, to help with basin water makeup.
The water chemistry lab is located in the gas combustion turbine building. Several
chemicals are used in the lab in small quantities for sample preservation, bottle
rinsing, equipment calibration, analytical chemistry, etc. The wastes are poured
down the sink, discharged into a bulking drain and gravity fed to the oil and water
separator.
The powerhouse building floor drains can receive input from spillage/leakage of
various chemicals and equipment, floor wash water, and maintenance activities.
The following are examples of materials that are stored/used inside the
powerhouse: ammonium hydroxide, hydrazine propylene glycol, new/used lube
oil, kerosene diesel fuel, phosphate, corrosion inhibitors, industrial cleaning
products, and miscellaneous lab chemicals.
Treated Domestic Sewage
The domestic sewage treatment system was removed in November of 2017.
UF Backwash, Portable Demineralizer trailer backwash, and RO rinse water
During normal demineralization (demin) water demand periods, the RO system
runs every 8 hours with a 4-hour break in between runs. On initial startup the RO
system is rinsed to be in the optimum operating conductivity range. The rinse
water produced during this initial startup is discharged to DRCC wastewater sump.
During high demin water demand periods, portable demin trailers are bought in
to supply additional demineralized water. These trailers are rinsed prior to use
and drained when the demin trailer is exhausted or upon project completion.
When the RO is operating, the UF system typically backwashes every 30-40
minutes. During UF system backwash, 135 gpm of backwash water is discharged
to the DRCC wastewater sump for approximately 2 minutes.

RO Cleaning Waste
The RO system is normally cleaned once a quarter. This process consists of an acid
cleaning, a caustic cleaning, and treatment utilizing a biocide. The cleaning waste
is sent to the neutralization tank and treated with acid/caustic for pH control.
Upon neutralization, the waste is discharged to the DRCC wastewater sump.
Service Water/Fire Water Storage Tank and Demineralizer Water Storage Tanks
Overflow/Draft
Periodically, maintenance will need to be performed on the Service Water/Fire
Water Tank and the Demineralizer Water Tank. This maintenance will require the
water from the storage tanks to be drained to the DRCC wastewater sump.
Sludge Holding Tank
In 2019 DRCC installed a 20,000 gallon sludge holding tank for storage of sludge
accumulated in the Clarifier during major plant maintenance outages. During
clarifier maintenance the activities, the sludge will be pumped to the sludge
holding tank and the water layer will be routed through the blowdown line for
dichlorination prior to discharge to the DRCC wastewater sump.
Outfall 002 —Ash Pond
Discharge from outfall 002 ceased in May of 2019. Excavation of ash from the ash ponds
was completed in June 2019. Outfall 002 was removed in October 2020. Certificate of
Final Approval for breach of the Primary and Secondary Ash Pond dams and
reclassification of the dams as low hazard reclaimed status was received in April 2021.
Outfalls— 102, 103, 104-Seep Discharge
Discharge from the constructed seeps consisted of seepage from the ash ponds and
stormwater. The flow from the seeps ceased in May 2019.
Combined Cycle Industrial Wastes for Offsite Disposal
Clarifier Sludge
Sludge is removed from the clarifier and dewatered utilizing a plate and frame
filter press. The dewatered sludge is shipped to an industrial landfill.
Gas Turbine Compressor Wash
Each combustion turbine unit is equipped with a 6000-gallon compressor wash
water sump. Periodically, the combustion turbines receive an online or offline

compressor wash. This activity involves injecting water with a mild detergent into
the compressor section of the turbine and subsequent rinse cycles. The offline
wash generates approximately 4000 to 5000 gallons of wastewater per turbine.
This activity occurs between 3 to 5 times per year per turbine. An outside waste
disposal company is contracted to remove the wastewater for offsite disposal.
Chiller Sumps
The chiller plant has two chiller sumps where chilled water (propylene
glycol/water mixture) is collected during maintenance activities and normal
operation. An outside waste disposal company is contracted to remove the
wastewater for offsite disposal.

Potential Discharges Not Covered by Analysis
Location Chemical Quantity Frequency Purpose
Water treatment 60%Ferric 5000 gal tank As needed Coagulant
(Clarifier) Sulfate/Ferralyte 8130
Water Treatment 25%Sodium 3000 gal tank As Needed pH control
(Clarifier) Hydroxide
Water Treatment 12.5%Sodium 6000 gal tank As Needed disinfection
(Clarifier) Hypochlorite
Water Treatment Nalclear 7768 400 gal tote As Needed Flocculant
(Clarifier and Thickener
Tank)
Water Treatment Ferralyte 8130 3000 gallons As Needed Flocculant
(Clarifier and Ferric Sulfate
Thickener Tank)
Water Treatment PolyClean 7 5 gal pails As Needed Polymer pump
(Polymer Pumps) cleaning solution
Cooling Tower 3D Trasar 3DT187 2000 gals tank As needed Dispersant/corrosion
(shared with Chiller inhibitor
Tower)
Cooling Tower 12.5%Sodium 6000 gals tank As needed Disinfection/biological
(shared with Chiller Hypochlorite growth control
Tower)
Cooling Tower Trasar 3DT199 110 gal tote As needed Corrosion inhibitor
(shared with Chiller
Tower)
Cooling Tower Nalco 7468 5 gal pails As needed Defoamer
Chiller System DOWFROST HD 63000 gals Circulated, Cooling Agent
(propylene glycol) (system) closed system
Chiller System Dupont SUVA 123 2000 gals Circulate, Refrigerant
closed system
Chiller System NalPrep IV 200 gals 1/year Layup Chemical
Closed Cooling Water 33% Propylene 21000 gals As needed Cooling Agent
Glycol (system)
Closed Cooling Water Nalco C-4710 5 gal pail As needed Corrosion Inhibitor
Demineralizer Bldg 38%Sodium 330 gal tote As needed Dechlorination
(RO and Cooling Tower bisulfite
Blow down)
Demineralizer Bldg 25%Sodium 330 gal tote As needed pH control
(RO system) hydroxide
Demineralizer Bldg 50%Citric acid 350 gal tote As needed UF acid cleaning
(UF system)
Demineralizer Bldg(UF 12.5%sodium 330 gal tote As needed UF bleach cleaning
system) hypochlorite
Demineralizer Bldg AntiscalantPC- 110 gal tote As needed Corrosion inhibitor
(RO system) 191T
Demineralizer Bldg RoCide DB20 150 ml 1/quarter or as Biocide
(RO cleaning biocide) needed
Demineralizer Bldg RoClean P303 96 lbs 1/quarter or as RO acid cleaning
(RO cleaning) needed
Demineralizer Bldg RoCide IS2 30 gal tote 1/quarter or as Biocide
(RO cleaning) needed

Demineralizer Bldg RoClean P111 96 lbs 1/quarter or as RO caustic cleaning
(RO cleaning) needed
Aux Boiler Bldg 19%Aqueous 330 gal tote As needed pH control
(HRSG Water) Ammonia
Aux Boiler Bldg Eliminox 75 gal tote As needed Oxygen scavenger
(HRSG Water)
Unit 9 HRSG phosphate Trisodium 300 gal tank As needed Corrosion Inhibitor
skid phosphate
(HRSG Water)
Unit 8 HRSG phosphate Trisodium 300 gal tank As needed Corrosion Inhibitor
skid phosphate
(HRSG water)
Steam Turbine Bldg 19%Aqueous 350 gal tote As needed pH control
(HRSG Water) ammonia
Selective Catalytic 19%Aqueous 20000 gal tank As needed NOx emissions
Reduction ammonia reduction
System Rhodamine As needed As needed Tracing of
Maintenance WT Liquid Leaks
Dye

Thermal Modeling Report
Duke Energy - Dan River Combined Cycle
Prepared for:
Duke Energy Carolinas, LLC
Charlotte, North Carolina
August 11, 2020
Prepared by:
Water Environment Consultants
Mount Pleasant, South Carolina
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Thermal Modeling Report- Dan River Steam Station
Table of Contents
Executive Summary iv
1 Introduction 1
2 NPDES Outfall 001 3
3 EFDC Modeling 5
3.1 Field Data Collection 5
3.2 Model Setup and Calibration 9
3.3 7Q10 Model Conditions 14
3.4 Outfall 001 Mixing Zone Results and Proposed Permit Limits 16
4 References 18
ii

Thermal Modeling Report- Dan River Steam Station
List of Figures
Figure 1-1. Site Location Map 2
Figure 2-1. Location of Dan River Combined Cycle Steam Station Outfall 001 3
Figure 2-2. Photo of discharge pipe at Outfall 001 4
Figure 3-1. Photo of study area (outfall pipe is located at right as shown) 6
Figure 3-2. Photo study area (downstream of outfall) 7
Figure 3-3. Measured depths on August 13, 2019 (aerial at higher flow condition) 8
Figure 3-4. Depth-averaged, measured velocities on August 13, 2019 (aerial at higher flow condition) 9
Figure 3-5. Model grid and flow barriers 10
Figure 3-6. Depth grid 11
Figure 3-7. Model grid and bathymetry converted to feet relative to NAVD88 12
Figure 3-8. Calibrated model velocities and measured current velocities (upstream portion) 13
Figure 3-9. Calibrated model velocities and measured current velocities (downstream portion) 14
Figure 3-11. 7Q10 model results for summer(top)and winter(bottom)conditions 17
List of Tables
Table 3-1. 7Q10 model inputs 15

Thermal Modeling Report- Dan River Steam Station
Executive Summary
Duke Energy Carolinas, LLC(Duke) retained Water Environment Consultants (WEC)to conduct a thermal
modeling analysis at Duke's Dan River Combined Cycle Station in Eden, North Carolina. The coal-fired
steam station was retired and removed from the site,and a 620-MW combined cycle power plant was
constructed in 2012. The current discharge from Outfall 001 is process water and cooling water from
the combined cycle plant. A thermal mixing zone evaluation is required to determine the appropriate
permit limitations for the discharge without the ambient cooling previously provided by the wastewater
treatment basins. This report and the proposed limitations must be reviewed by the North Carolina
Department of Environmental Quality (NCDEQ)for incorporation into the next NPDES discharge permit.
WEC used the Environmental Fluid Dynamics Code (EFDC)to assess if the discharge will meet the 29°C
maximum and 2.8°C rise-above-background requirements (15 NCAC 02B .0211 Fresh Water Quality
Standards for Class C Waters) at an acceptable distance downstream. Per EPA's Exposure Assessment
Models webpage, "EFDC is a state-of-the-art hydrodynamic model that can be used to simulate aquatic
systems in one,two, and three dimensions. It has evolved over the past two decades to become one of
the most widely used and technically defensible hydrodynamic models in the world."
Local depths and current velocity measurements were collected using a Sontek M9 Acoustic Doppler
Current Profiler (ADCP), equipped with a differential GPS to provide horizontal positioning data. A
Trimble Geo 7x Centimeter Edition survey unit was used to collect water surface elevations along the
river bank. This data was used to set up and calibrate an EFDC model for the project. Once calibrated,
the model was used to predict thermal plume mixing under summer and winter 7Q10 conditions. The
proposed effluent temperature limits for summer and winter conditions were 99°F and 88°F,
respectively. The model was run under a maximum discharge flow rate of 1.33 MGD and with
temperature dilution from mixing only(no heat loss from evaporation). Both assumptions provide a
conservative estimate of how the effluent plume mixes with the ambient river flow.
The critical condition modeled for the summer was the 29°C maximum temperature standard. The
critical condition modeled for the winter was the 2.8°C exceedance over background conditions. The
model results show that a majority of the thermal plume is contained within the small channel beneath
the outfall pipe which connects to Dan River. As the plume mixes with the river, it remains attached to
same bank as the outfall. The results indicate the summer and winter limits will be met at a distance of
134 feet and 97 feet downstream, respectively.
Because the conservative modeled summer and winter temperatures of 99°F and 88°F respectively
support the ambient water quality standards, Duke should request these permit limitations be included
in the NPDES permit. Because actual discharge temperatures will be less than the maximum permit
limits,the actual instream plume will be smaller than the conservative model prediction results.
Therefore,there is no need for Duke to bear the expense of complying with upstream and downstream
temperature monitoring/limitations.
iv
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Thermal Modeling Report- Dan River Steam Station
1 Introduction
Water Environment Consultants (WEC) prepared this report for Duke to provide the results of a thermal
modeling analysis at Duke's Dan River Combined Cycle Station (Dan River) in Eden, North Carolina
(Figure 1-1). The coal-fired steam station has been retired and removed from the site,and a 620-MW
combined cycle power plant was constructed in 2012. The current discharge from Outfall 001 is process
water and cooling water from the combined cycle plant. A thermal mixing zone will be required to meet
the discharge permit limitations issued by the North Carolina Department of Environmental Quality
(NCDEQ). WEC performed mixing zone modeling to assess if the discharge will meet the 29°C maximum
and 2.8°C rise-above-background requirements (15 NCAC 02B .0211 Fresh Water Quality Standards for
Class C Waters) at an acceptable distance downstream. A description of the work performed by WEC to
complete the assessment and the model results is provided in the following sections:
• Section 2, NPDES Outfall 001—provides a brief description of the outfall;
• Section 3, EFDC modeling—describes the field data collection methodology, model calibration,
and 7Q10 modeling analysis and results.
1
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Thermal Modeling Report- Dan River Steam Station
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Thermal Modeling Report- Dan River Steam Station
2 NPDES Outfall 001
Per the current NPDES Permit(NC0003468), the Dan River Outfall 001 discharges cooling tower
blowdown and plant collection sumps (low volume wastes)from the combined cycle unit directly to the
Dan River via Outfall 001.
WEC visited the Dan River site on August 13, 2019,to characterize the location and flow geometry at the
discharge location. The Outfall 001 discharge pipe is along the dam wall on the northern (downstream)
end of a short channel flowing into the Dan River(Figures 2-1 and 2-2). Water flowing from the outfall
pipe lands within a rectangular, containment basin before spilling into the channel and slowly flowing
into the Dan River. After mixing with the dam overflow,the discharge plume moves downstream within
the Dan River.
sr
Feet Legend
0 150 300 450 600 Outfall Location
Figure 2-1. Location of Dan River Combined Cycle Steam Station Outfall 001
3

Thermal Modeling Report- Dan River Steam Station
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Thermal Modeling Report- Dan River Steam Station
3 EFDC Modeling
This summary describes an application of the Environmental Fluid Dynamics Code (EFDC)for modeling
the Outfall 001 discharge into the Dan River. The purpose of the model study is to estimate the mixing
of the combined cycle wastewaters in the Dan River and determine if the discharge will meet the 29°C
maximum and 2.8°C rise-above-background requirements (15 NCAC 02B .0211 Fresh Water Quality
Standards for Class C Waters) at an acceptable distance downstream. This section describes: 1)the field
data collected to support the model, 2)the model setup and calibration, 3)the application of the model
under 7Q10 summer and winter conditions, and 4) model results that estimate where the NCDEQ water
quality standards are met.
3.1 Field Data Collection
Water depth and current measurements were collected to support the model study. Water depth data
is required in order to create a two-dimensional grid for the EFDC model. Current velocity
measurements are required for comparison to the modeled currents in order to verify that the model
reasonably represents the hydrodynamics in the vicinity of the mixing zone. Together, detailed water
depth and velocity data can be used to better select the ambient model geometry and the associated
portion of the 7Q10 flow.
Field data was collected on August 13, 2019. The study area extended from the discharge point to
approximately 880 feet downstream the Dan River. Photos of the site from the day of data collection
are shown in Figures 3-1 and 3-2.
A Sontek RiverSurveyor-M9 Acoustic Doppler Current Profiler(ADCP) was used to collect both water
depth and current velocity data. The Sontek M9 is equipped with a differential GPS to provide
horizontal positioning data. Water surface elevation was also measured using a Trimble Geo 7x
Centimeter Edition GPS with 0.1-foot accuracy. This data was used to convert the measured water
depths to bottom elevations relative to a fixed vertical datum (i.e., NAVD88). The measured depths are
shown in Figure 3-3 and the depth-averaged current velocities measured along transects are shown in
Figure 3-4.
5
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Thermal Modeling Report- Dan River Steam Station
Outfall pipe , 4
N. N.
Figure 3-1. Photo of study area (outfall pipe is located at right as shown)
6
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Thermal Modeling Report-Dan River Steam Station
m. �. •
m f 11t - 6
•
•
Figure 3-2. Photo study area (downstream of outfall)
7
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Thermal Modeling Report- Dan River Steam Station
Legend
Measured Depths (ft) 5.0 -6.0
• 0.75 - 1.0 - 6.0 - 7.0
• 1.0-2.0 7.0 - 8.0
N + 2.0-3.0 • 8.0 - 9.0
AFeet 3.0-4.0 • 9.0 - 10.0
0 50 100 200 300 4.0 -5.0 • 10.0 - 10.5
Figure 3-3. Measured depths on August 13, 2019(aerial at higher flow condition)

Thermal Modeling Report- Dan River Steam Station
Vector Magnitude
1.36
1.2
OS 1.0
0.8
- 0.6
Measured Velocities - 0.4
1.36(mps) 0.2
0.00(mps)
0.0
Figure 3-4. Depth-averaged, measured velocities on August 13, 2019 (aerial at higher flow condition)
3.2 Model Setup and Calibration
WEC created a two-dimensional model grid of the Dan River extending from the dam approximately
1,000 ft downstream (Figure 3-5). Certain areas were known to be dry during low flow conditions,
which include several rock outcrops and a sandbar. These locations were noted as very shallow during
the field data collection,when flows were higher, and later verified as dry with low-flow aerial imagery.
Figure 3-5 uses this low-flow imagery where the dry areas are visible. Therefore,grid cells that
overlapped these locations were inactivated in the model in order to redirect flow.
The water depths measured with the ADCP were interpolated onto a grid, as shown in Figure 3-6. The
grid was then edited to account for shallow areas along rock ledges and the shoreline, as described
earlier. The water depths were converted to bottom elevations using the water surface elevations
collected with the Trimble survey unit. The bottom elevations are referenced to NAVD88. The
bathymetry grid was interpolated onto the EFDC grid for modeling as shown in Figure 3-7.
The model boundary conditions included the upstream flow and the downstream water elevation. The
upstream flow rate was determined from the ADCP measurements on the data collection day. The
average flow measured across the ADCP transects was calculated as 716.9 cubic feet per second (cfs)
and distributed across the upstream boundary along the
9

Thermal Modeling Report- Dan River Steam Station
•
istumat
N
Feet Legend
0 50 100 200 300 El Model Grid
Figure 3-5. Model grid and flow barriers
dam. Though US Geological Survey(USGS)gage 02071000, located approximately 13.0 miles upstream,
reports flow during the field measurement day, several rivers and stream merge into the Dan River prior
to the site,so the records could not be used. The downstream boundary was specified as an open
boundary with a constant water elevation. The downstream water elevation was measured during field
data collection as 479.3 ft NAVD88, roughly two feet lower than the water level just below of the dam.
The EFDC model was iteratively calibrated to match the current velocities measured on the field
collection day. Figure 3-8 and Figure 3-9 illustrate the modeled and measured current velocities in
meters per second (mps). The arrows indicate flow directions and are scaled to a common magnitude.
The modeled currents correlate with measured velocities. The measured data shows more local
variation in currents, such as a singular, larger peak velocity just north of the first rock outcrop. The
slightly lower peak modeled velocity, 1.0 mps, compared to the peak measured, 1.36 mps, is an artifact
of the model bathymetry being smoother than the actual river bathymetry. However,when comparing
areas on a whole, rather than a singular point,the velocities are much closer.
10
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Thermal Modeling Report- Dan River Steam Station
4t ..
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• 0.0 - 0.5 * 3.0 -4.0
• 0.5 - 1.0 • 4.0 -6.0
N „ 1.0- 1.5 • 6.0-8.0
A, Feet 1.5-2.0 • 8_0- 10.5
0 50 100 200 300 2.0-2.5
Figure 3-6. Depth grid
Additionally,the model does well in estimating the flow paths, represented by the vector arrows,
around shoals and rock ledges. Both the modeled and measured velocities show a peak acceleration of
current along the northern (plant side) bank and part of the southern bank. On average,the model
tends to under-estimate the velocity magnitude in the rocky shoals. As a result,the model will likely be
conservative and under-estimate the amount of mixing and dispersion of the outfall effluent. Overall,
the model reasonably represents the current velocities in the river and the model is sufficiently
calibrated in this area for the purposes of evaluating the outfall discharge mixing zone.
—
11
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Thermal Modeling Report- Dan River Steam Station
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12
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Thermal Modeling Report- Dan River Steam Station
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Thermal Modeling Report- Dan River Steam Station
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Jf ////j // -..- - _ _ /ram.i,,,,,,,'- Modeled Velocities
J f l/ ��/, r 1.36 m/s
�// ��/i
J ,1/ , 0.00 m/s
/// j-- //' ,,' ,,-' Measured Velocities
-�' - i ram>, 0.00 m/s
Figure 3-9. Calibrated model velocities and measured current velocities(downstream portion)
3.3 7Q10 Model Conditions
The 7Q10 model is used to verify whether the thermal mixing zone meets the discharge permit
limitations issued by NCDEQ. The NCDEQ water quality standard for temperature has two components:
not to exceed 2.8°C(5.04°F) above natural background and not to exceed 29°C(84.2°F). Inputs to the
calibrated EFDC model were modified to represent the critical 7Q10 conditions. Both summer and
winter conditions were considered in the analysis. The critical condition modeled for the summer was
the maximum temperature, and the critical condition modeled for the winter was the temperature
exceedance over background conditions.
The model was run under two conservative assumptions: maximum design discharge rate of 1.33 MGD
and temperature dilution from mixing only(no evaporative losses). The inputs adjusted from the
calibrated model included the summer and winter 7010 flow rates,the downstream water surface
elevation, and the discharge's temperature excess as compared to the ambient temperature. The water
surface elevation measured during field monitoring was lowered based on change in water depths at
USGS station 02071000 associated with similar change in flow rates. Figure 3-10 shows the measured
14

Thermal Modeling Report- Dan River Steam Station
Stage vs. Flow Rate
4
y=-2E-19x6+2 E-15x5-5E-12x4+9E-09x3-8E-06x2+0.0054x
3.5 R2=0.9985
3
z. 2.5
00 2
tO
`I 1.5
1
0.5
0
0 100 200 300 400 500 600 700 800 900 1000
Flow(cfs)
• USGS data 7Q10 Summer • 7Q10 Winter • Calibration day Best Fit Eq.(USGS data)
Figure 3-10. Flow-stage relationship at USGS station 02071000
depths and flow rate data points at the USGS station. Based on the best-fit equation of the data,and
similar stream characteristics at both sites, WEC determined downstream water levels at the project site
for the summer and winter 7Q10 conditions.
Thermal mixing from the discharge was modeled using EFDC's dye tracer module,which simulates
dilution from mixing only and excludes evaporative losses as mentioned above. WEC reviewed four
years of ambient water temperature records near the outfall. The 95' and 5`h percentile temperatures
were used as ambient conditions for the summer and winter critical conditions, respectively. During
summer months,the 95th percentile river temperature was 27.6°C (81.7°F). During winter months,the
5th percentile temperature was 1.4°C (34.5°F). Duke provided WEC with estimates of the maximum
projected effluent discharge temperatures for summer and winter months. The summer maximum
temperature was 35.6°C(96°F) and the winter maximum temperature was 29.4°C (85°F). WEC added a
3°F compliance margin similar to the thermal models approved by NCDEQ for Duke's Rogers and
Asheville sites. The temperature excess (above background) used for modeling the summer condition
was 9.6°C(17.3°F), and the temperature excess for the winter condition was 29.7°C(53.5°F). Table 3-1
summarizes the inputs in SI units as used in EFDC.
Table 3-1. 7Q10 model inputs
7Q10 flow Downstream WL Effluent flow Effluent Temperature
rate(cms) (m NAVD88) rate(cms) Excess(°F)
Summer 8.89 145.9 0.058 17.3
Winter 16.4 146.0 0.058 53.5
15

Thermal Modeling Report— Dan River Steam Station
3.4 Outfall 001 Mixing Zone Results and Proposed Permit Limits
The model results for a 1.33 MGD discharge from Outfall 001 are shown in Figure 3-11. The colored
contours represent the temperature excess above background in units of degrees Fahrenheit for
summer and winter conditions. The downstream position where the water quality standard is met is
marked with a magenta line. For the summer condition,this line marks where the 29°C(84.2°F)
maximum temperature standard is met. For the winter results,the line marks where the discharge
meets the 2.8°C(5.04°F) exceedance above background standard.
As shown by the colored contours,the majority of the plume dilution takes place within the small
channel where the effluent is initially contained. Downstream,the plume remains narrow and strongly
bank attached where the water is deeper and the currents move faster. Near the boat ramp a small
rock outcrop pushes the plume away from the bank where it begins to spread. However,the plume
meets the summer and winter standards well prior to this point. The results for a 1.33 MGD discharge
at 99°F show the plume will meet the maximum temperature standard (84.2°F) approximately 134 feet
downstream of the dam. For a 1.33 MGD discharge at 88°F,the no-more-than 5.04°F exceedance above
background standard will be met approximately 97 feet downstream. In addition,the very narrow
plume widths also support safe passage of aquatic life.
Because the conservative modeled summer and winter temperatures of 99°F and 88°F respectively
support the ambient water quality standards, Duke should request these permit limitations be included
in the NPDES permit. These discharge limitations should be measured at the current compliance point,
noting that heat loss through the discharge pipe prior to entering the river should be minimal. Because
actual discharge temperatures will be less than the maximum permit limits,the actual instream plume
will be smaller than the conservative model prediction results. Therefore,there is no need for Duke to
bear the expense of complying with upstream and downstream temperature monitoring/limitations.
_:°v
16

Thermal Modeling Report- Dan River Steam Station
•
•
.
Legend
Temperature Excess°F 2.0-3.0
N 0.0-0.1 3.0-4.0
Feet - 0.1 -1.0 11111 4.0-5.0
0 75 150 225 300
1.0-2.0 5.0-17.5
J
Legend
•
emperature Excess°F 4.0-5.0
• MI 0.0-0.1 5.0-10.0
0.1 -1.0 n 10.0-20.0
1.0-2.0 111 20.0-30.0
Feet 2.0-3.0 11111 30.0-40.0
0 75 150 225 300
3.0-4.0 IIIII 40.0-54.0
Figure 3-10. 7Q10 model results for summer(top)and winter(bottom)conditions
17
v

Thermal Modeling Report- Dan River Steam Station
4 References
Martin,Joyce; D. H. Newcomb. "RE: Infor Needed-Future Summer&Winter Daily Max Permit Limits
(for modeling)." Correspondence with Duke Energy.June 3, 2020. E-mail
U.S. Geological Survey. 2020. National Water Information system. USGS 02071000 Dan River Near
Wentworth, NC.Water Data for the Nation, accessed 2020 at
https://wate rdata.usgs.gov/usa/nwis/uv?site_no=02071000
18
VV L�C

Clean Water Act § 316(b)
Compliance Submittal
aSaYlpt r,"4""a a,
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DAN RIVER COMBINED CYCLE STATION
Eden, North Carolina
NPDES Permit NC0003468
Duke Energy Environmental Services I Environmental Programs
526 South Church Street
Charlotte NC 28202
May 2021
DUKE
O tt` ENERGY®

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Contents
Executive Summary 1
1 Introduction 4
2 Source Water Physical Data [§122.21(r)(2)] 7
2.1 Description of Source Waterbody [§122.21(r)(2)(i)] 7
2.2 Characterization of Source Waterbody [§122.21(r)(2)(ii)] 8
2.2.1 Geomorphology 8
2.2.2 Hydrology 8
2.2.3 Water Quality 8
2.3 Locational Maps [§ 122.21(r)(2)(ii) 12
3 Cooling Water Intake Structure Data [§ 122.21(r)(3)] 13
3.1 Description of MWIS Configuration [§122.21(r)(3)(i)] 13
3.2 Latitude and Longitude of MWIS[§122.21(r)(3)(ii)] 17
3.3 Description of MWIS Operation [§122.21(r)(3)(iii)] 17
3.4 Description of Intake Flows [§122.21(r)(3)(iv)] 18
3.5 Engineering Drawings of CWIS[§122.21(r)(3)(v)] 18
4 Source Water Baseline Biological Characterization Data [§122.21(r)(4)] 19
4.1 List of Unavailable Biological Data [§122.21(r)(4)(i)] 20
4.2 List of Species and Relative Abundance in the vicinity of CWIS [§122.21(r)(4)(ii)] 20
4.2.1 Exotic Species 26
4.3 Primary Growth Period 26
4.3.1 Reproduction and Larval Recruitment 26
4.4 Species and Life Stages Susceptible to Impingement and Entrainment 32
4.4.1 Impingement 32
4.4.2 Entrainment 33
4.4.3 Selected Species 36
4.5 Threatened, Endangered, and Other Protected Species Susceptible to Impingement and
Entrainment at the MWIS 39
4.6 Documentation of Consultation with Services 41
4.7 Incidental Take Exemption or Authorization from Services 41
4.8 Methods and Quality Assurance Procedures for Field Efforts 41
4.9 Fragile Species 41
5 Cooling Water System Data [§122.21(r)(5)(i)] 42
5.1 Description of Cooling Water System Operation [§122.21(r)(5)(i)] 42
5.1.1 Cooling Water System Operation 42
5.1.2 Proportion of Design Flow Used in the Cooling Water System 43
5.1.3 Cooling Water System Operation Characterization 44
5.1.4 Distribution of Water Reuse 45
5.1.5 Description of Reductions in Total Water Withdrawals 45
5.1.6 Description of Cooling Water Used in Manufacturing Process 46

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
5.1.7 Proportion of Source Waterbody Withdrawn 46
5.2 Design and Engineering Calculations [§122.21(r)(5)(ii)] 46
5.3 Description of Existing Impingement and Entrainment Reduction Measures[§122.21(r)(5)(iii)] 47
5.3.1 Best Technology Available for Entrainment 47
6 Chosen Method(s) of Compliance with Impingement Mortality Standard [§122.21(r)(6)] 49
7 Entrainment Performance Studies [§ 122.21(r)(7)] 51
7.1 Site-Specific Studies 51
7.2 Studies Conducted at Other Locations 51
8 Operational Status [§ 122.21(r)(8)] 52
8.1 Description of Operating Status[§ 122.21(r)(8)(i)] 52
8.1.1 Individual Unit Age 52
8.1.2 Utilization for Previous Five Years 52
8.1.3 Major Upgrades in Last Fifteen Years 53
8.2 Description of Consultation with Nuclear Regulatory Commission [§122.21(r)(8)(ii)j 53
8.3 Other Cooling Water Uses for Process Units[§122.21(r)(8)(iii)] 53
8.4 Description of Current and Future Production Schedules[§122.21(r)(8)(iv)] 53
8.5 Description of Plans or Schedules for New Units Planned within Five Years[§122.21(r)(8)(v)] 53
9 References 54
ii

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Tables
Table 1-1. Facility and Flow Attributes and Permit Application Requirements 5
Table 1-2. Summary of§316(b) Rule for Existing Facilities Submittal Requirements for§122.21(r)(2)-(8). 6
Table 2-1. Annual Mean Concentration for Select Field and Analytical Parameters in the Vicinity of the DRCCS
MWIS (Location B1). 10
Table 2-2. Turbidity at Location B1 and River Flows Recorded at the USGS Gauging Station - Dan River near
Wentworth (02071000) and Smith River at Eden (02074000) 12
Table 3-1. DRCCS MWIS Monthly Total Withdrawals During 2016-2020 18
Table 4-1. 2015-2017 Environmental Monitoring Location on the Dan River 21
Table 4-2. Fish Species and Community Composition (%)for Transect B, Collected by Boat Electrofishing, 2015-
2017. 21
Table 4-3. Fish Species, Number Collected and Relative Abundance (fish/hour)for Transect B by Year from
Boat Electrofishing, 2015-2017. (NC= No catch) 23
Table 4-4. Known Spawning and Recruitment Period of Fish Collected in the Vicinity of the DRCCS MWIS
(Jenkins and Burkhead 1993; Rohde et al. 2009). [Lighter shade indicates the spawning window while the
darker shading indicates the peak spawning period] 26
Table 4-5. Seasonal and Daily Activities of Species Collected in the Vicinity of the DRCCS MWIS (Jenkins and
Burkhead 1994; Rohde et al. 2009). 27
Table 4-6. Entrainment Potential for Fish (Egg and Larvae)Species Present near the DRCCS MWIS. 33
Table 4-7. Summary of Rare,Threatened, or Endangered (RTE)Aquatic Species Listed for Rockingham County,
North Carolina, and Record of Occurrence of Potential to Occur Near the DRCCS MWIS. 39
Table 4-8. List of Fragile Species as Defined by the EPA and Their Occurrence in the Vicinity of the DRCCS
MWIS 41
Table 5-1. Percent Monthly Proportion of Design Flow Withdrawn at the DRCCS 44
Table 5-2. Comparison of DRSS and DRCCS 46
Table 5-3. DRCCS Percent of Source Waterbody(Dan River) Withdrawal 46
Table 5-4. MWIS TSV Calculations 47
Table 8-1. DRCCS Annual Capacity Factors, 2016-2020 53
iii

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Figures
Figure 2-1. Map Showing the DRCCS MWIS in the Dan River Basin (Hydrologic Unit Code 03010103) 9
Figure 2-2. Duke Energy Dan River Long-Term Sampling Location in the Vicinity of the DRCCS MWIS 10
Figure 2-3. Dan River flows at the USGS Gauging Stations—Dan River near Wentworth (02071000) and Smith
River at Eden (0207400) during 2015-2017. 11
Figure 3-1. DRCCS Water Balance Diagram 14
Figure 3-2. Plan View of MWIS at DRCCS 15
Figure 3-3. Section View of MWIS at DRCCS 16
Figure 3-4 Wedgewire Screen Design of DRCCS 17
Figure 4-1. Upstream and Downstream Designation of Transect B. 21
Figure 4-2. Aerial View of the MWIS and orientation within the Dan River 33
Figure 5-1. DRCCS Cooling Tower General Arrangement 43
Figure 5-2. Monthly Total MWIS Withdrawals at DRCCS 45
iv

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Appendices
Appendix A. Dan River Combined Cycle Station § 122.21(r)(2)-(8) Submittal Requirement Checklist.
Appendix B. Engineering Drawings of Makeup Water Intake Structure.
Appendix C. Engineering Calculations for Through-Screen Velocity.
V

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Abbreviations
°C degrees Celsius
°F degrees Fahrenheit
uS/cm micro Siemens per centimeter
AIF actual intake flow
A01 area of influence
BTA Best Technology Available
CCC closed cycle cooling
CFR Code of Federal Regulations
cfs cubic feet per second
cm centimeter
COC cycles of concentration
CWA Clean Water Act
CWIS Cooling Water Intake Structure
DIF design intake flow
Director NPDES Director
DO dissolved oxygen
DRCCS Dan River Combined Cycle Station
DRSS Dan River Steam Station
Duke Energy Duke Energy Carolinas,LLC
EPA United States Environmental Protection Agency
ESA Endangered Species Act
fps feet per second
ft foot/feet
ft msl feet above mean sea level
gpm gallons per minute
HRSG heat recovery steam generator
HUC Hydrologic Unit Code
IPaC Information for Planning Conservation
IRP Integrated Resource Plan
m meter
µm micrometer
uS/cm microsiemens per centimeter
m3 cubic meters
MDCT mechanical draft cooling tower
MGD million gallons per day
mg/L milligrams per liter
mm millimeters
MW megawatts
MWIS Makeup Water Intake Structure
NCDEQ North Carolina Department of Environmental Quality
NCNHP North Carolina Natural Heritage Program
NMFS National Marine Fisheries Service
NPDES National Pollutant Discharge Elimination System
NRDAR Natural Resource Damage Assessment and Restoration
NTU Nephelometric Turbidity Units
OTC once-through cooling
QA Quality Assurance
POA percent open area
Rule Clean Water Act§316(b)rule
RTE rare,threatened,or endangered
vi

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
TL total length
TSV through-screen velocity
USEPA U.S.Environmental Protection Agency
USFWS U.S.Fish and Wildlife Service
USGS U.S.Geological Survey
VII

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Executive Summary
On August 15,2014, regulations implementing§316(b)of the final Clean Water Act(CWA)rule for existing
facilities (the Rule) were published in the Federal Register with an effective date of October 14, 2014.
Facilities subject to the Rule are required to develop and submit technical material, in accordance with
§122.21(r), that will be used by the National Pollutant Discharge Elimination System (NPDES) permit
Director(Director)to make a Best Technology Available (BTA) determination for the facility.
The Dan River Combined Cycle Station(DRCCS)began commercial operations in December 2012,replacing
three coal-fired units which were subsequently demolished. The DRCCS is a single combined cycle unit,
natural gas-fired electric generating facility with a current generating capacity of 718 MW. The DRCCS
wastewater discharges are authorized by NPDES Permit NC0003468. Therefore, DRCCS is an existing
facility and subject to the Rule.
The§122.21(r)submittal material provided herein concludes that the DRCCS employs Best Technology
Available (BTA) for impingement and entrainment reduction with currently installed closed-cycle
cooling as described below and, as such, no further impingement or entrainment controls are
warranted.
Impingement BTA
The final Rule, at §125.94(c), requires existing facilities to employ one of seven impingement BTA
alternatives'. DRCCS is compliant for impingement because it employs two of these alternatives, any one
of which would be wholly compliant for impingement:
• Primary impingement BTA—Closed-cycle cooling with a mechanical draft cooling tower is utilized
to provide makeup water which is consistent with a closed-cycle recirculating system (CCRS)
defined at§125.92(c) and meets the BTA Standards for Impingement Mortality at§125.94(c)(1).
• Secondary impingement BTA — Cooling tower makeup water intake structure employing
cylindrical wedgewire screens with 3.2 mm (0.125") slots designed to have a maximum design
through-slot velocity of less than 0.5 fps; thus meeting the BTA Standards for Impingement
Mortality at§125.94(c)(2).
Overall, impingement at the facility is expected to be near or zero due to the combination of low makeup
flows to the cooling tower and makeup intake structure low (<_0.25 fps) through-slot velocity. There are
no known federal or state listed species or designated critical habitats within the source waterbody(Dan
River) in the vicinity of the DRCCS. As a result, potential adverse impacts due to impingement are not
expected to occur.
'Or under specific circumstances one of nine alternatives,which includes§125.94(c)(11)and(12)in addition to
§125.94(c)(1)-(7).
1

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Entrainment BTA
The Rule does not prescribe BTA for entrainment; however, requires it to be determined on a site-specific
basis. This submittal demonstrates that DRCCS meets BTA for entrainment based on the following:
• The DRCCS uses closed-cycle cooling, which minimizes entrainment through flow reduction.
During the 2016-2020 period, the DRCCS average withdrawal was 3.48 million gallons per day
(MGD) which is substantially less than the 125 MGD value of concern technically justified by the
Rule. The flow reduction achieved with consideration of the high-efficiency combined cycle
facility, is calculated to be 98.8%as compared to an equivalent once-through cooling(OTC)facility
based on design flow and 365 days per year operation. Using actual average Dan River makeup
withdrawal,the equivalent flow reduction is calculated at 99.4%when compared to an equivalent
OTC steam electric facility. In addition,the average flow is reduced 70.3 percent from the design
potential flow of 11.88 MGD.
• Statements made by the United States Environmental Protection Agency (EPA) in the preamble
to the Rule support this conclusion:
"Although this rule leaves the BTA entrainment determination to the Director,
with the possible BTA decisions ranging from no additional controls to closed-cycle
recirculating systems plus additional controls as warranted, EPA expects that the
Director, in the site-specific permitting proceeding, will determine that facilities
with properly operated closed-cycle recirculating systems do not require
additional entrainment reduction control measures. "2
This conclusion is further reiterated in the Response to Public Comments document, where EPA
states:
"EPA has made it clear that a facility that uses a closed-cycle recirculating
system, as defined in the rule, would meet the rule requirements for
impingement mortality at§125.94(c)(1). This rule language specifically identifies
closed-cycle as a compliance alternative for the [impingement mortality]
performance standards. EPA expects the Director would conclude that such a
facility would not be subject to additional entrainment controls to meet BTA."3
• The final Rule for new facilities published in the Federal Register on December 18, 2001 which
had an effective date of January 17, 2002, does prescribe BTA for entrainment'', which DRCCS
meets. Regulations are more stringent for new facilities than for existing facilities. By virtue of
meeting the most stringent entrainment BTA criteria (i.e., applicable to new facilities), DRCCS is
compliant for entrainment BTA under the final Rule for existing facilities.
279 Fed. Reg. 48344(15 August 2014)
3 Response to Comments, Essay 14, p.62.
4 BTA for entrainment under the new facilities rule at 40 CFR §125.84(b) requires facilities with design intake flow
equal to or greater than 10 MGD, and under Track 1,to employ closed-cycle recirculating cooling as well.
2

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Potential impacts to fish and shellfish populations due to entrainment are also extremely unlikely due to:
• The use of closed cycle cooling via mechanical draft cooling towers;
• Low actual and design water withdrawals; and
• The operation and configuration of the intake which features cylindrical wedgewire screens with
3.2 mm slots, screen orientation parallel to the Dan River flow, screen submergence at least ten
feet below the river elevation, and design through-slot velocity of 0.25 fps. The calculated
through screen velocity (TSV) for the design intake flow (DIF) case is 0.15 fps and under actual
intake flow(AIF) conditions is 0.07 fps.
Based on the above facts, entrainment is reduced to the maximum extent warranted and additional
control measures are not warranted nor necessary for the DRCCS.
3

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
1 Introduction
Section 316(b)was enacted under the 1972 CWA,which also introduced the NPDES permit program.
Certain facilities with NPDES permits are subject to§316(b) requirements,which require the location,
design, construction, and capacity of the facility's cooling water intake structure (CWIS)5 to reflect BTA
for minimizing potential adverse environmental impacts.
On August 15, 2014, regulations implementing§316(b) of the CWA for existing facilities (Rule)were
published in the Federal Register with an effective date of October 14, 2014. The Rule applies to existing
facilities that withdraw more than 2 MGD from waters of the United States, use at least 25 percent of
that water exclusively for cooling purposes, and have or require an NPDES permit.
Facilities subject to the Rule are required to develop and submit technical material that will be used by
the NPDES Director(Director)to make a Best Technology Available (BTA) determination for the facility.
The actual intake flow(AIF)6 and design intake flow (DIF)' at a facility determines which submittals will
be required. As shown in Table 1-1,facilities with an AIF of 125 MGD or less have fewer application
submittal requirements and will generally be required to select from the impingement compliance
options contained in the final Rule. Facilities with an AIF in excess of 125 MGD are required to address
both impingement and entrainment, and provide specific entrainment studies, which may involve
extensive field studies and the analysis of alternative methods to reduce entrainment (§122.21(r)(9)-
(13)).
The §316(b) compliance schedule under the Rule is dependent on the facility's NPDES permit renewal
date. Facilities are to submit their§316(b) application material to the Director with their next permit
renewal application unless that permit renewal application is due prior to July 14, 2018, in which case an
alternate schedule may be requested.
5 CWIS is defined as the total physical structure and any associated constructed waterways used to withdraw
cooling water from Waters of the United States.The CWIS extends from the point at which water is first
withdrawn from waters of the United States up to,and including,the intake pumps.
6 AIF is defined as the average volume of water withdrawn on an annual basis by the cooling intake structure over
the past 3 years initially and past 5 years after Oct. 14,2019.The calculation of AIF includes days of zero flow.AIF
does not include flows associated with emergency and fire suppression capacity.
DIF is defined as the value assigned during the CWIS design to the maximum instantaneous rate of flow of water
the CWIS is capable of withdrawing from a source waterbody.The facility's DIF may be adjusted to reflect
permanent changes to the maximum capabilities of the cooling water intake system to withdraw cooling water,
including pumps permanently removed from service,flow limit devices,and physical limitations of the piping. DIF
does not include values associated with emergency and fire suppression capacity or redundant pumps(i.e., back-
up pumps).
4

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Table 1-1. Facility and Flow Attributes and Permit Application Requirements.
Existing facility with DIF greater than 2
MGD and AIF greater than 125 MGD. §122.21(r)(2) (13)
Existing facility with DIF greater than 2
MGD and AIF less than 125 MGD. §122.21(r)(2) (8)
Existing facility with DIF of 2 MGD or
less,or less than 25 percent of AIF Director Best Professional Judgment
used for cooling purposes.
New units at existing facility. §122.21(r)(2), (3), (5), (8), and (14) and applicable
paragraphs (r)(4), (6), and (7) of§122.21(r)
Duke Energy Carolinas, LLC's (Duke Energy) DRCCS is subject to the existing facility rule and, based on its
current configuration and operation (i.e.,the facility has a DIF greater than 2 MGD and an AIF of less
than 125 MGD), Duke Energy is required to develop and submit each of the§122.21(r)(2)-(8)submittal
requirements (Table 1-2) with its next permit renewal application in accordance with the facility NPDES
operating permit and the Rule's technical and schedule requirements. Appendix A provides a checklist
summary of the specific requirements under each of the§122.21(r)(2)-(8) submittal requirements and
how each is addressed in this report or why it is not applicable to DRCCS.
5

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Table 1-2.Summary of§316(b) Rule for Existing Facilities Submittal Requirements for§122.21(r)(2)-(8).
(2) Source Water Physical Data Characterization of the source waterbody including
intake area of influence.
(3) Cooling Water Intake Structure Data Characterization of the cooling water intake system;
includes drawings and narrative;description of
operation;water balance.
(4) Source Water Baseline Biological Characterization of the biological community in the
Characterization Data vicinity of the intake; life history summaries;
susceptibility to impingement and entrainment;
existing data; identification of missing data;
threatened and endangered species and designated
critical habitat summary for action area;
identification of fragile fish and shellfish species list
(<30 percent impingement survival).
(5) Cooling Water System Data Narrative description of cooling water system and
intake structure; proportion of design flow used;
water reuse summary; proportion of source
waterbody withdrawn (monthly); seasonal operation
summary;existing impingement mortality and
entrainment reduction measures;flow/megawatts
(MW) efficiency.
(6) Chosen Method of Compliance with Provides facility's proposed approach to meet the
Impingement Mortality Standard impingement mortality requirement(chosen from
seven available options); provides detailed study
plan for monitoring compliance, if required by
selected compliance option; addresses entrapment
where required.
(7) Entrainment Performance Studies Provides summary of relevant entrainment studies
(latent mortality,technology efficacy);can be from
the facility or elsewhere with justification;studies
should not be more than 10 years old without
justification; new studies are not required.
(8) Operational Status Provides operational status for each unit; age and
capacity utilization for the past 5 years; upgrades
within last 15 years; uprates and Nuclear Regulatory
Committee relicensing status for nuclear facilities;
decommissioning and replacement plans; current
and future operation as it relates to actual and
design intake flow.
6

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
2 Source Water Physical Data [§122.21(r)(2)]
The information required to be submitted per 40 Code of Federal Regulations (CFR) §122.21(r)(2),
Source Water Physical Data, is as follows:
(i) A narrative description and scaled drawings showing the physical configuration of all source
water bodies used by your facility, including areal dimensions,depths, salinity and temperature regimes,
and other documentation that supports your determination of the waterbody type where each cooling
water intake structure is located;
(ii) Identification and characterization of the source waterbody's hydrological and
geomorphological features, as well as the methods you used to conduct any physical studies to
determine your intake's area of influence within the waterbody and the results of such studies;
(iii) Locational maps; and,
(iv) For new offshore oil and gas facilities that are not fixed facilities, a narrative description and/or
locational maps providing information on predicted locations within the waterbody during the permit
term in sufficient detail for the Director to determine the appropriateness of additional impingement
requirements under§125.134(b)(4).
Each of these requirements is described in the following subsections.
2.1 Description of Source Waterbody [§122.21(r)(2)(i)]
The Dan River Makeup Water Intake Structure (MWIS) is located just upstream of a low head dam on
the northern shore of the Dan River approximately 4.1 river kilometers downstream of the confluence of
the Dan and Smith Rivers. The Dan River is located within the Roanoke River Basin,which includes
watersheds in North Carolina and Virginia. The North Carolina portion of the Roanoke River Basin is
3,500 square miles and lies along the northern Piedmont region before terminating in the Albemarle
Sound (NCDEQ 2020). The Dan River originates east of the Blue Ridge Parkway in Patrick County,
Virginia, and flows south/southeast into North Carolina before joining the Smith River in Eden, NC. The
Smith River also originates east of the Blue Ridge Parkway in Patrick County,Virginia. The Smith River
flows northeast into Philpot Lake before turning south/southeast and flowing into North Carolina and
joining the Dan River in Eden, NC. The North Carolina section of the Dan River is classified as Class C
waters (Aquatic Life,Secondary Recreation, Freshwater) and Tr(Trout Waters) by the North Carolina
Department of Environmental Quality(NCDEQ). Land uses along the upstream area of the river includes
agricultural,forested, industrial, and residential (Duke Energy 2019).
7

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
2.2 Characterization of Source Waterbody [§122.21(r)(2)(ii)]
To identify and characterize the primary source waterbody(i.e.,the Dan River in the vicinity of the
CWIS)the following resource was reviewed:
Dan River Long-Term Environmental Monitoring Report(Duke Energy 2019)
As a result of a pipe failure and subsequent ash release from the retired Dan River Steam Station (DRSS)
ash pond into the Dan River on February 2, 2014, Duke Energy committed to conducting intensive
monitoring of the river and the headwaters of Kerr Lake for three years (2015-2017)to assess potential
environmental impacts as well as to support the Natural Resource Damage Assessment and Restoration
(NRDAR) process. Select data from this report were compiled, synthesized, and are summarized below.
2.2.1 Geomorphology
The Dan River is located within the Piedmont Level III ecoregion and, more specifically,the CWIS is
located within the Triassic Basin (Level IV) of the Piedmont ecoregion.The Piedmont region is
considered to be the non-mountainous portion of the old Appalachians Highland by physiographers,the
northeast-southwest trending Piedmont ecoregion comprises a transitional area between the mostly
mountainous ecological regions of the Appalachians to the northwest and the relatively flat coastal plain
to the southeast. It is an erosional terrain of moderately dissected irregular plains with some hills,with a
complex mosaic of Precambrian and Paleozoic metamorphic and igneous rocks. Most rocks of the
Piedmont are covered by a thick mantle of saprolite, except along some major stream valley bluffs and
on a few scattered granitic domes and flat rocks. The Triassic Basin extends from Virginia, across North
Carolina, and just slightly into South Carolina. The Triassic Basins within North Carolina occurs in four
narrow bands and have unusual Piedmont geology of un-metamorphosed shales,sandstones,
mudstones, siltstones, and conglomerates. Local relief and elevations are often less than the
surrounding regions, and with rocks that are easier to erode,stream valleys that cross the region tend to
widen. Soils are often clayey with low permeability, and streams have low base flows (Griffith et al.
2002).
2.2.2 Hydrology
Within North Carolina, the Roanoke River Basin is divided into five U.S. Geological Survey(USGS)
hydrologic units, each designated by Hydrologic Unit Code (HUC). The CWIS is located in the Cascade
Creek-Dan River(0301010309) portion of the Dan River HUC 03010103 (Figure 2-1). This section of the
river encompasses an area of 61.9 miles with 167.7 miles of stream. Land use within this section of the
basin is predominantly forested area followed by agriculture and non-forested stream buffer(NCDEQ
2018).
2.2.3 Water Quality
As a component of the Dan River Natural Resources Damage assessment, Duke Energy collected a wide
range of water quality data from multiple sampling locations along the Dan River(Duke Energy 2019).
Sample data collected from location B1,which is in the vicinity of the CWIS,from 2015—2017 (Figure 2-
2)was used to characterize water quality. The sampling program included bi-monthly collection of field
parameters and analytical samples from the surface throughout the Dan River system (Duke Energy
8

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
2019). For the purposes of this report,the analytical parameter list has been reduced. Additional
analyte data can be found in the Dan River Long-Term Monitoring Report (Duke Energy 2019).
...wand
=Dan Raw S nydrdoyc Una State Boundaries ours
10 Digit Hydrologic Units Clam Bondanos
®0301010301 Lids Dan RawDn Raw n CaantyBsundanas
▪ 0301010302 Town ForkCnhk • Do Raw Cwnbned Cyclo 9tato
0301010303 Dolores Lata•Dan Raw Bedford
®0301010306 Mayo Raw
-0301010305 NwnmonyCn oaDn Raw
`0301010306 Upper 9nath Raw
-0301010307 Middle Smith Raw N obeli
'.1'.0301010306 Lcwar 9nnh Raw 0 5 10
0301010305 cmade CnokAn Myer -Miles
0301010310 Sandy Raw
1
Franklin Virginia
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s
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Ill Pttsylvanta
44 . .
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erq,iliatSieb..4,.
45
Mayo River ' Henry . _
ille
lillitile sarti7yer s.n' el asce:: r s .� Caswet
Surry , Stokes Ma+nmony Crnefcy. ,,,
Rock:noh.. ..
Bel Lake- Poor
Dan River Combined Cycle Station
fi Alt
,! n F,ot CI--:: ...t
Yadkin
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Nlindiana OhW i
West Virginia `
CavesKentucicy Virginia
V
1111.
Teniressae
Davidson North Carolina
�� Georgia South CarolinaRowan C
r
Figure 2-1. Map Showing the DRCCS MWIS in the Dan River Basin(Hydrologic Unit Code 03010103).
9

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
•
voi
Dan River CWIS
tr,
•
•
Dan River Sampling `Y
Location (B1) �:,��
.,
Figure 2-2. Duke Energy Dan River Long-Term Sampling Location in the Vicinity of the DRCCS MWIS.
Table 2-1.Annual Mean Concentration for Select Field and Analytical Parameters in the Vicinity of the DRCCS
MWIS(Location B1).
Parameter 2015 2016 2017
Dissolved oxygen(mg/L)A 9.6 9.6 9.3
pH A 7.1 7.3 7.4
Water Temperature (°C)A 15.6 15.9 17.6
Specific Conductance (µS/cm)A 115 103 103
Turbidity(NTU)A 23.0 95.7 14.5
Total dissolved solids(mg/L)B 91.5 74.4 69.3
Ammonia-N (mg/L)B 0.049 0.013 0.015
Nitrate+ nitrite-N (mg/L)B 0.14 0.17 0.18
Total nitrogen (mg/L)B 0.38 1.50 0.26
Total phosphorus(mg/L)B 0.0455 0.2007 0.022
Total organic carbon(mg/L)B 3.6 4.1 1.7
Calcium (mg/L)B 9.2 9.6 8.4
Chloride(mg/L)B 15.3 15.4 11.4
Magnesium (mg/L)B 3.5 3.5 2.9
Sodium(mg/L)B < 5.0 <5.0 5.1
Sulfate(mg/L)B 6.0 6.1 5.0
Total alkalinity(mg/L as CaCO3)B 18.7 19.4 23.6
10

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Hardness(mg equiv.CaCO3/L)B 37.0 38.0 33.1
River Flow(cfs)` 931 980 833
AField parameter.
'Analytical parameter.
River flow was calculated by combining the flow from the Dan River at Wentworth gauge
(02071000)with the Smith River gauge (02074000).
Mean annual concentrations of select water quality parameters within the Dan River near the CWIS
appeared to be consistent from 2015—2017 except for turbidity. For most parameters,the highest
annual mean concentration occurred during 2016. This could potentially be attributed to the multiple
high flow events that occurred during the late part of 2015 and lasting though early-2017 (Figure 2-3).
30000
25000
,1 20000
u
3
- 15000 6
v
10300
5000 , li
0
ti91y ti��y ti�1� ti��� ti�yb ti�N ti�N tiON' ti0%
tiNac tiOb ti��� tiN'b ti �� ti`'e� tiNI' ti`saa tiC.,
Date
Dan River(02071000) - Smith River(02074000)
Figure 2-3. Dan River flows at the USGS Gauging Stations—Dan River near Wentworth(02071000)and Smith
River at Eden(0207400)during 2015-2017.
Turbidity had the greatest degree of variability. Annual means ranged from 14.5 in 2017 to 95.7 in 2016.
One sampling event in 2016 (May 3) resulted in a turbidity value of 521 NTU. Turbidity was also high at
other sampling locations upstream and downstream of B1 during this sampling event (Duke 2019). The
high turbidity could be linked to the increase in river flow(Figure 2-3 and Table 2-2), land use(NCDEQ
2018), and the flashy nature of the Dan River
11

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Table 2-2.Turbidity at Location B1 and River Flows Recorded at the USGS Gauging Station—Dan River near
Wentworth (02071000)and Smith River at Eden(02074000).
Sample Collection Date Dan River Flow Smith River Flow
and Time Turbidity (NTU) (cfs) (cfs)
01/26/2015—16:30 21 938 657
03/04/2015—14:30 9.0 888 273
05/07/2015—11:30 10 772 860
07/27/2015—14:30 6.0 330 219
09/22/2015—09:15 14 242 207
11/03/2015—11:00 79 3,190 1,560
01/05/2016—15:50 14 1,480 1,040
03/21/2016—16:45 8.3 1,420 500
05/03/2016—16:15 521 12,800 1,880 ,
07/12/2016—11:00 18 651 505
09/06/2016—14:15 9.8 476 388
I 11/08/2016—14:35 3.3 384 115
01/16/2017—13:00 4.8 563 346
03/21/2017—11:40 2.8 559 158
05/03/2017—13:00 47 1,610 1,090
_ 07/17/2017—14:07 7.4 577 382
09/05/2017—10:36 11 445 315
2.3 Locational Maps [§ 122.21(r)(2)(ii)
An aerial photograph of the DRCCS and its environs is provided on Figure 2-2 (Section 2.2.3).
12

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
3 Cooling Water Intake Structure Data {§
122.21(r)(3)]
The information required to be submitted per 40 CFR §122.21(r)(3), Cooling Water Intake Structure
Data, is outlined as follows:
(i) A narrative description of the configuration of each of the cooling water intake
structures and where it is located in the waterbody and in the water column;
(ii) Latitude and longitude in degrees, minutes,and seconds for each of the cooling water
intake structures;
(iii) A narrative description of the operation of each of the cooling water intake structures,
including design intake flows, daily hours of operation, number of days of the year in operation
and seasonal changes, if applicable;
(iv) A flow distribution and water balance diagram that includes all sources of water to the
facility, recirculating flows, and discharges; and
(v) Engineering drawings of the cooling water intake structure.
Each of these requirements is described in the following subsections.
3.1 Description of MWIS Configuration [§122.21(r)(3)(i)]
Cooling tower makeup water for DRCCS is withdrawn from Dan River via the existing DRSS MWIS. The
former DRSS was retired in 2012 and the existing CWIS was retrofitted with three 30-inch-diameter
wedgewire screen units with the screen face oriented parallel to the direction of the river flow. Pumped
raw water is routed to a clarifier for treatment prior to use by the station. Approximately 94 percent of
the treated water from the clarifier is used for cooling tower makeup water(see Figure 3-1 for the water
balance diagram). The remaining filtered water is stored in the fire water/service water tank for use as
fire protection water, makeup water for the combined cycle unit heat recovery steam generator(HRSG),
and/or various other plant functions.
The raw water intake system at the DRCCS consists of three wedgewire screens, three submersible
intake pumps, and piping retrofitted into the existing DRSS CWIS. Makeup water is withdrawn from Dan
River via the three submerged, cylindrical wedgewire screens located along the north bank of Dan River.
The wedgewire screen array is located in the flowing section of the river channel just beyond the end of
the intake structure wingwall as shown on Figure 3-2. The riverbed elevation in this area is
approximately 482.5 feet above mean sea level (ft msl) and the centerline of the cylindrical wedgewire
screens is at 487.25 ft msl. The bottom of the screens is at 486.0 ft msl, or approximately 3.5 ft above
the riverbed. The top of the screens is at 488.5 ft msl,which is 1.5 ft below the crest of the low-head
diversion dam located immediately downstream from the intake structure. It is assumed that the crest
elevation of the low-head dam (490 ft msl) represents the minimum water elevation. As a result,the
minimum depth at the wedgewire screen array is approximately 7.5 ft. Figure 3-3 provides relevant
MWIS elevation data.
13

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Each wedgewire screen unit is 30 inches in diameter and 91.5 inches in total length with 31 inches in
screen length on either side of a 24-inch-diameter flange. Each screen has a manufacturer design
capacity of 2,500 gallons per minute (gpm) (3.6 MGD) and has 3.2-millimeter(mm)slot openings with
68.7 percent open area (POA). As directed by plant staff, an air sparging system may be operated to
remove any accumulated trash and debris. Figure 3-4 provides the wedgewire screen design details.
The three wedgewire screens are connected to a common 24-inch-diameter header pipe,which in turn
is connected to an 82-foot-long feed pipe that runs across the length of the forebay before it bends at a
90-degree angle and is connected to the three submersible raw water intake pumps located within the
reinforced concrete intake structure. The cooling water piping configuration is shown on Figures 3-2
and 3-3.
Each of the three raw water intake pumps is rated at 3.6 MGD, however, only two pumps are operated
at the same time with one pump remaining as a spare for redundancy. Therefore,the maximum pump
capacity (or DIF) of the raw water intake pumps is 7.2 MGD.
rvII —. cDDIA,e. _ 1"VID vA Y,IA&FII w .tiolKs ,rM
il
III.
P l • •
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..A no..rlrADMr. •
OE a NMWASIf
rat GM... W.W.II.
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,Flrrsirwirsr 1 .... • ri alrunx ,•"o , I.% „'•• . srrvnrt IA „`" • N.
P, Kamm
.xA01NG.AMt s .r INMIFN ._
..w m
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• • II
O • • ..0
COMTE
w • III~vV9(5S w • rMA . .w MA.
SHEET I OF. 1 .A1fir
Figure 3-1. DRCCS Water Balance Diagram
14

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
u T%
- - T()
-+
��r
j _ _ , 4 _ Dine
- 4- }
_ �\
,,`...':-.?41!(.1-- - 4,124Plj
1
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x ,
1 •° PLA4 NEW .
Lk.EMEN.Ow RION
_ ]p!!X MO NV STAT
—_ MED PoD WM..MO,IMAM
Figure 3-2. Plan View of MWIS at the DRCCS
15

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
+
1. i s
III + • •.. M` ,.a
m..
I;C'...®"V I ..,..�. 1 --_ Vim - i ..
i j% I I rT I _ r - ..
iI
-^� III o3.�,.7
;I
..�„/ ,., .n+..r v�� �m- , III --.... \ • I.+�.... -,.'C"tzt,,S
SSS 1 Ir
.�,
®? 'w9?"V'ear
Figure 3-3. Section View of MWIS at the DRCCS
16

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
91.50'O.A.L.
45.75' H 31.00'
SCREEN LENGTH
0.25' _ I 2RACES H 0.25'
I .i...f.._..... _ _l
2994'None 1
0 2 Wads
I
_ 7 ---I —__.4., -_ _ l _—_—+—_—_ -r 44.0r
30.00
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.— —22.78' .t I I I
14—14.00'-1 24.00'0
a o ele O LiI.
1 111111111 1 11111 111111111 111111 111 O O I
11111111IIIIIIIIIIImlmu1111U O 0'111111111111111111111111111111111
1 11111111111111111111111111111111f 111111111111111111111111111111111
1 III"
IIIIIIIIIIIIIII"7 91110 a MIIIIIIHIIIIIIIIIIIIIIIIUIIII
Illlllilllllllllllili )a =CM it liil l iil iii li 11
Illlluul111111111111._ ..dlll t/ min a IIIIIIIIIIIIIIIIIu1111111111111
IIIIIIIIIIIu111111111uu1111111 O Iuuuumomlaulummn
1111111111111ulu1111I111111111110 E. 0 1m111111111111111111111111u1111
,`11h1211I O I NOTE:
0 C 1 G 0.41M, 1) Capacity 2,500 GPM
c_1 0.25 ft/sec Maximum Through-Slot Velocity
2) Designed for 10 ft Depth
I 3) Screen Open Area=63.78%
NOT TO SCALE Total Screen Area=5,044 in'
Source:Johnson Screens,Drawing#16448-2(2013) Total Screen Open Area=3,500 in2
Figure 3-4. Wedgewire Screen Design of DRCCS
3.2 Latitude and Longitude of MWIS [§122.21(r)(3)(ii)]
The latitude and longitude(in degrees, minutes, and seconds) of DRCCS's MWIS is:
• Latitude: 36° 29' 08" N
• Longitude: 79°43' 16"W
3.3 Description of MWIS Operation [§122.21(r)(3)(iii)]
Withdrawal from the Dan River is dependent on makeup water demand, maximum pump capacity, and
water loss due to evaporation and system losses. Because makeup water demand is directly related to
the operation of generating units and in turn, the cooling water system, DRCCS MWIS operation
generally follows a base load pattern.
Operation of the MWIS is nearly continuous with at least one pump withdrawing water from the Dan
River. During the 2016-2019 period,the MWIS operated an average of 21.8 hours each day with one or
two pumps withdrawing water.
17

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
3.4 Description of Intake Flows [§122.21(r)(3)(iv)]
Monthly average water withdrawals during the 2016-2020 period are provided in Table 3-1. The average
withdrawal for this period was 3.2 MGD compared to a DIF of 7.2 MGD.
Table 3-1. DRCCS MWIS Monthly Total Withdrawals During 2016-2020.
Month 2016 2017 2018 2019 2020
January 95.79 96.83 100.28 111.07 100.20
February 91.63 98.26 100.98 105.75 98.54
March 99.38 110.93 114.96 121.88 111.20
April 100.15 50.85 85.53 94.50 62.32
May 74.19 106.13 125.71 136.78 98.45
June 110.48 121.68 117.73 132.60 119.19
July 121.44 130.41 143.88 150.94 138.65
August 120.38 131.39 141.57 153.14 123.52
September 117.84 118.03 87.28 137.09 106.99
October 85.79 95.70 104.65 82.50 109.35
November 114.84 115.83 117.74 3.88 91.54
December 91.21 105.13 103.16 78.13 42.58
Annual
3.34 3.51 3.68 3.58 3.29
Average
Units = MG for monthly total, MGD for annual average
3.5 Engineering Drawings of CWIS [§122.21(r)(3)(v)]
The following engineering drawings of cooling water intake structures are provided in Appendix B:
• Drawing D000830221: Raw Water Intake Screen Downstream Screen T30" HC-24" PS Intake
Screen Assembly w/3" ABW Connection
• Drawing DNROC-GA-M-IS.DS.EN-01: Duke Energy Dan River Combined Cycle Station Raw Water
Supply and Wastewater Discharge, Screen and Pump Station Plan
• Drawing DNROC-PY-M-IS.DS.EV-01: Duke Energy Dan River Combined Cycle Station Raw Water
Supply and Wastewater Discharge, Pump Station and Screen Elevation
18

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
4 Source Water Baseline Biological Characterization
Data [§122.21(r)(4)]
The information required to be submitted per 40 CFR§122.21(r)(4), Source Water Baseline Biological
Characterization, is outlined as follows:
(i) A list of the data supplied in paragraphs (r)(4)(ii)through (vi) of this section that are not
available and efforts made to identify sources of the data;
(ii) A list of species (or relevant taxa)for all life stages and their relative abundance in the
vicinity of CWIS;
(iii) Identification of the species and life stages that would be most susceptible to impingement
and entrainment;
(iv) Identification and evaluation of the primary period of reproduction, larval recruitment, and
period of peak abundance for relevant taxa;
(v) Data representative of the seasonal and daily activities of biological organisms in the vicinity
of CWIS;
(vi) Identification of all threatened, endangered, and other protected species that might be
susceptible to impingement and entrainment at a cooling water intake structure(s);
(vii) Documentation of any public participation of consultation with Federal or State agencies
undertaken in development of the plan;
(viii) Methods and QA procedures for any field efforts;
(ix) In the case of the owner or operator of an existing facility or new unit at an existing facility,
the Source Water Baseline Biological Characterization Data is the information included in (i)
through (xii);
(x) Identification of protective measures and stabilization activities that have been
implemented, and a description of how these measures and activities affected the baseline
water condition in the vicinity of CWIS;
(xi) List of fragile species as defined at 40 CFR 125.92(m) at the facility; and
(xii) Information submitted to obtain incidental take exemption or authorization for its cooling
water intake structure(s)from the U.S. Fish and Wildlife Service or the National Marine
Fisheries Service.
Each of these requirements is described in the following subsections.
19

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
4.1 List of Unavailable Biological Data [§122.21(r)(4)(i)]
The biological data needed to prepare the information required under 40 CFR §122.21(r)(4) are
available. The historical data reviewed to develop the baseline biological characterization of the source
waterbody, Dan River includes the following:
• Dan River Long—Term Environmental Monitoring Report (Duke Energy 2019)
These data were compiled and analyzed for this report and are summarized below. This report was
developed utilizing the relevant existing data for the Dan River. No impingement or entrainment studies
were performed in support of the development of this compliance documentation.
4.2 List of Species and Relative Abundance in the vicinity of CWIS
[§122.21(r)(4)(ii)]
For the purposes of this report,the monitoring location nearest to the CWIS (Transect B—lower end of
the sampling area was located approximately 2.75 rkm upstream of the CWIS)was used to describe the
fish community.
Boat electrofishing was conducted four times (seasonally) each year during daylight hours on the Dan
River during the study period (Figure 4-1,Table 4-1). Transect B was designated by an upstream
beginning and downstream ending stretching from bank to bank and divided into two stations, one on
each bank. The sampling stations were further divided into three replicates each consisting of 200-300
m distances (depending on the size of the reach)for a total of six replicates. Each station was sampled
using a Smith Root equipped,Wisconsin design electrofishing boat with pulsed DC current. In the river,
the station replicates were generally staggered in an alternating fashion from one bank to the other to
minimize recapture of released fish.
During the mid-summer sampling periods (July or August),four three-wing fyke nets were deployed
annually during the summer sampling period to ensure that the fish community was adequately
sampled. The nets were set for two consecutive days and fished at approximately 24-hour intervals.
Collected fish were identified to the species level when possible using regional taxonomic references
(Menhinick 1993,Jenkins and Burkhead 1994), measured for total length (TL)to the nearest millimeter,
and weighed to the nearest gram. Fish that could not be accurately identified in the field were
preserved with 10 percent buffered formalin solution and transported to the laboratory for
identification and body measurements. Each specimen was examined for hybridization, anomalies,
disease, parasites, and general condition. Photographs were also taken of fish with any deformity or
anomaly. Some specimens were retained in 70 percent ethanol for identification in the laboratory.
20

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Table 4-1. 2015-2017 Environmental Monitoring Location on the Dan River.
Transect Description Latitude(North) Longitude(West)
Designation
Fault Basin Physiographic
Province.
B(Leaksville
access ramp, Deeper and slower location due to Upstream: 36.486000 Upstream: -79.761440
Leaksville, low head dam located Downstream: 36.471399 Downstream: -79.743094
NC) approximately 2.7 kilometers
downstream of the lower crossing
of transect.
Figure 4-1.Upstream and Downstream Designation of Transect B.
'A
Transect B Upstream
• Lat.36.486000 Long.-79.761440
•
Transect B Downstream
Lat.36.471399 Long.-79.743094
In total 3,564 fish, representing 39 species (excluding hybrids and unidentified individuals), were
collected at Transect B on the Dan River from 2015 to 2017. Species composition was typical for this
ecoregion and habitat type. Dominant species included Redbreast Sunfish (26.1%), Golden Redhorse
(24.7%),V-Lip Redhorse (11.0%)White Shiner(6.3%), Comely Shiner(6.2%), Bluegill (4.3%), Largemouth
Bass (2.9%), Bull Chub (2.2%), and Snail Bullhead (2.1%) (Table 4-2). The fish community composition for
each sample year(2015, 2016, and 2017)was similar. Annual mean catch rate (fish/hour)was slightly
variable for the dominant species (Table 4-3).
Table 4-2. Fish Species and Community Composition(%)for Transect B,Collected by Boat Electrofishing,2015-
2017.
Scientific Name Common Name Total Fish Collected Total Composition
Ambloplites cavifrons Roanoke Bass 15 0.4
A.rupestris Rock Bass 1 0.0
Ameiurus brunneus Snail Bullhead 75 2.1
A.platycephalus Flat Bullhead 24 0.7
Carpiodes cyprinus Quillback 37 1.0
Catostomus commersonii White Sucker 45 1.3
Cyprinella analostana Satinfin Shiner 26 0.7
21

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
C.lutrensis Red Shiner 6 0.2
Cyprinus carpio Common Carp 9 0.3
Etheostoma vitreum Glassy Darter 3 0.1
Hypentelium nigricans Northern Hog Sucker 32 0.9
H.roanokense Roanoke Hogsucker 2 0.1
Ictalurus furcatus Blue Catfish 1 0 03
L punctatus Channel Catfish 27 0.8
Lepomis auritus Redbreast Sunfish 929 26.1 L.cyanellus Green Sunfish 12 0.3
L.gulosus Warmouth 2 0.1
L.macrochirus Bluegill 153 4.3
L.microlophus Redear Sunfish 62 1.7
Luxilus albeolus White Shiner 226 6.3
L.cerasinus Crescent Shiner 1 0.03
Lythrurus ardens Rosefin Shiner 50 1.4
Micropterus dolomieu Smallmouth Bass 37 1.0
Micropterus salmoides Largemouth Bass 102 2.9
Moxostoma.cervinum Blacktiplumprock 4 0.1
M.collapsum Notchlip Redhorse 29 0.8
M.erythrurum Golden Redhorse 879 24.7
M.pappillosum V-Lip Redhorse 393 11.0
Nocomis.leptocephalus Bluehead Chub 28 0.8
N.raneyi Bull Chub 78 2.2
Notemigonus crysoleucas Golden Shiner 1 0.03
Notropis amoenus Comely Shiner 221 6.2
N.hudsonius Spottail Shiner 35 1.0
N.procne Swallowtail Shiner 4 0.1
Noturus insignis Margined Madtom 5 0.1
Percinanevisense Chainback Darter 3 0.1
Pomoxis annularis White Crappie 1 0.03
P.nigromaculatus Black Crappie 4 0.1
Pylodictis olivaris Flathead Catfish 2 0.1
22

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Table 4-3. Fish Species, Number Collected and Relative Abundance(fish/hour)for Transect B by Year from Boat Electrofishing,2015-2017. (NC= No catch)
Common 2015 2016 2017
Scientific Name Name Composition Composition Composition
Quantity (%) Fish/Hr Quantity (%) Fish/Hr Quantity WO
Ambloplites Roanoke Bass 2 0.16 0.18 6 0.56 1.09 7 0.56 1.13
cavifrons
A.rupestris Rock Bass 1 0.08 0.18 NC NC
Ameiurus brunneus Snail Bullhead 29 2.33 1.60 23 2.15 0.73 23 1.85 1.29
A.platycephalus Flat Bullhead 5 0.40 0.89 11 1.03 1.27 8 0.64 1.29
Carpiodes cyprinus Quillback 6 0.48 1.07 22 2.05 2.18 9 0.72 1.45
Catostomus White Sucker 9 0.72 1.60 22 2.05 4.00 14 1.13 2.25
commersonii
Cyprinella Satinfin Shiner 16 1.28 2.85 4 0.37 0.73 6 0.48 0.97
analostana
C.lutrensis Red Shiner NC 6 0.56 1.09 NC
Cyprinus carpio Common Carp NC 3 0.28 0.55 6 0.48 0.97
Etheostoma Glassy Darter 3 0.24 0.53 NC NC
vitreum
Hypentelium Northern Hog 15 1.20 2.67 6 0.56 1.09 11 0.88 1.77
nigricans Sucker
H.roanokense Roanoke NC NC 2 0.16 0.32
Hogsucker
Ictalurus furcatus Blue Catfish NC NC 1 0.08 0.16
I.punctatus Channel NC 5 0.47 0.73 22 1.77 0.48
Catfish
Lepomis auritus Redbreast 321 25.76 57.15 269 25.12 48.91 339 27.25 54.53
Sunfish
L.cyanellus Green Sunfish 10 0.80 1.78 NC 2 0.16 0.32
L.gulosus Warmouth NC 1 0.09 0.18 1 0.08 0.16
L.macrochirus Bluegill 15 1.20 2.67 36 3.36 6.55 102 8.20 16.41
23

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
L.microlophus Redear 4 0.32 0.71 24 2.24 4.36 34 2.73 5.47
Sunfish
Luxilus albeolus White Shiner 120 9.63 21.36 88 8.22 16.00 18 1.45 2.90
L.cerasinus Crescent NC NC 1 0.08 0.16
Shiner
Lythrurus ardens Rosefin Shiner 21 1.69 3.74 25 2.33 4.55 4 0.32 0.64
Micropterus Smallmouth 19 1.52 3.38 10 0.93 1.82 8 0.64 1.13
dolomieu Bass
M.salmoides Largemouth 39 3.13 6.94 24 2.24 4.36 39 3.14 6.27
Bass
Moxostoma Blacktip 2 0.16 0.36 NC 2 0.16 0.32
cervinum Jumprock
M.collapsum Notchlip NC 26 2.43 4.73 3 0.24 0.32
Red horse
M.erythrurum Golden 289 23.19 50.39 213 19.89 38.00 377 30.31 60.32
Redhorse
M.pappillosum V-Lip 184 14.77 32.76 83 7.75 15.09 126 10.13 20.11
Redhorse
Nocomis Bluhead Cub 16 1.28 2.85 12 1.12- 2.18 NC
leptocephalus
N.raneyi Bull Chub 28 2.25 4.99 11 1.03 2.00 39 3.14 6.27
Notemigonus Golden Shiner NC NC 1 0.08 0.16
crysoleucas
Notropis amoenus Comely Shiner 57 4.57 10.15 126 11.76 22.91 38 3.05 6.11
N.hudsonius Spottail 29 2.33 5.16 6 0.56 1.09 NC
Shiner
N.procne Swallowtail 1 0.08 0.18 3 0.28 0.55 NC
Shiner
Noturus insignis Margined NC 3 0.28 0.55 2 0.16 0.32
Madtom
24

316(b) Compliance Submittal
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Percina nevisense Chainback 3 0.24 0.53 NC NC
Darter
Pomoxis annuloris White Crappie NC 1 0.09 0.18 NC
P.nigromaculatus Black Crappie 2 0.16 0.36 2 0.19 0.36 NC
Pylodictis olivaris Flathead 1 0.08 0.18 NC 1 0.08 0.16
Catfish
25

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
4.2.1 Exotic Species
Common Carp(Cyprinus carpio)was the only Exotic Species (USGS 2020) collected during the study
period and only represented 0.3%of the individuals collected.
4.3 Primary Growth Period
Fish are cold blooded,thus primary growth occurs when water temperatures are 10°C or above. The
conventional view on seasonal variation in fish growth in North America is that growth is fastest in the
spring and early summer,slows in the late summer and fall, and virtually stops in the winter(Gebhart
and Summerfelt 1978).The majority of fishes will have their highest densities shortly after the hatch
occurs when larvae are concentrated, and natural mortality has not yet reduced numbers. Feeding
competition is especially important during late spring through early summer when the bulk of fish are in
their early life stages. During this time,they are more susceptible to starvation (May 1974).This is a
critical stage in development,where larval fish have a short time period to initiate exogenous feeding
before starving(Ehrlich 1974; Miller et al. 1988).
4.3.1 Reproduction and Larval Recruitment
Spawning and recruitment details for fish species collected near the Dan River CWIS are described in
detail in Table 4-4 and 4-5. Most of the fish species collected prefer a spring—early summer spawning
period. During this time period, egg and larval fish in the vicinity of the Dan River CWIS are most
susceptible to entrainment.
Table 4-4. Known Spawning and Recruitment Period of Fish Collected in the Vicinity of the DRCCS MWIS(Jenkins
and Burkhead 1993; Rohde et al.2009). [Lighter shade indicates the spawning window while the darker shading
indicates the peak spawning period]
Common Name ; Jan Feb Mar Apr May Jun `,' Jul Aug Sep Oct Nov Dec
Roanoke Bass'
Rock Bass 1111
Snail Bullhead
Flat Bullhead
Quillback
White Sucker
Satinfin Shiner
Red Shiner2
Common Carp
Glassy Darter .11
Northern Hogsucker
Roanoke Hogsucker3
Blue Catfish
Channel Catfish
Green Sunfish
Warmouth
Bluegill
26

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Redbreast Sunfish I C
Redear Sunfish
White Shiner
Crescent Shiner
Rosefin Shiner
Smallmouth Bass
.
Largemouth Bass .0
Blacktip Jumprock •
Notchlip Redhorse
•
Golden Redhorse
V-Lip Redhorse
Bluehead Chub
Bull Chub
Golden Shiner r C
Comely Shiner
Spottail Shiner
Swallowtail Shiner
Margined Madtom
Chainback Darter
White Crappie
Black Crappie
Flathead Catfish
'Due to the lack of field spawning observations(Jenkins and Burkhead 1993),the Rock Bass(Ambloplites rupestris)spawning
period was uses as a surrogate.
2 https://nas.er.usgs.gov/queries/FactSheet.aspx?specieslD=518
3Due to the lack of field spawning observations(Jenkins and Burkhead,1993),the Northern Hogsucker(Hypentelium nigricans)
spawning period was uses as a surrogate.
Table 4-5.Seasonal and Daily Activities of Species Collected in the Vicinity of the DRCCS MWIS(Jenkins and
Burkhead 1994;Rohde et al.2009).
Species Seasonal Activities(Spawning) Daily Activities(Feeding and Habitat)
(Common
Name)
Roanoke Bass Natural spawning in streams has not Inhabits firm substrate among boulders and bedrock in
been observed. In hatcheries, moderate to swift current. Young eat small crustaceans and
spawning occurs when temperatures insects. Juveniles and adults prey on fishes,insects and
are between 20—22°C. Males particularly crayfishes.
construct circular nest in clay and
gravel near banks. After spawning,
males guard the nest and attend to
the larvae. Fecundity ranges from
3,000—11,500 mature(or maturing)
ova.
27

316(b)Compliance Submittal
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Rock Bass Spawning occurs between April and Inhabits clear,moderate-gradient,cool and warm creeks,
July when temperatures are between streams,and rivers. They also inhabit pools and backwaters,
15.6—26°C. Males fan out circular and strongly associate with shelter. As a generalist predator,
nests in the shallows having coarse young eat microcrustaceans,insects and other invertebrates.
sand to large gravel substrate. Males Adults prey on insects and other invertebrates,fishes,and
defend the nest against intruders. particularly crayfishes.
Fecundity ranges from 2,000—11,000,
with the average around 5,000 eggs.
Snail Bullhead Spawning occurs from May thru July Inhabits warm,medium and large rivers,reservoirs in near-
starting at temperatures of 21°C in shore habitats,associates with cover such as large rock,logs,
May. Large nests are constructed on fallen trees. Feeds on aquatic invertebrates and fish,
bottom in sand or gravel,near or in omnivorous feeding on aquatic invertebrates and fishes.
fallen tree and logs,eggs are then
guarded by males.
Flat Bullhead Similar to Snail Bullheads,spawning Similar to the Snail Bullhead,occupies warm,medium and
occurs in May and June at peaking at large rivers,reservoirs in near-shore habitats,associates with
temperatures between 21—24°C in cover such as large rock,logs,fallen trees. Feeds on aquatic
May. Assumed to construct nests and invertebrates and fishes.
guard eggs similar to other Bullhead
catfishes.
Quillback Spawning occurs between mid-April Inhabits warm lakes,reservoirs,and low to moderate-gradient
and much of June when temperatures rivers. Occasionally found in small streams and ditches.
are between 11—25°C. Spawning has Generalist feeder on fine-grained particles,insects,small
been reported to occur in riffles,calm mollusks,other invertebrates,plant material,and usually
parts of streams,and in overflow large amounts of flocculent detritus.
bayous with eggs laid on gravel,sand,
mud,and organic matter.
White Sucker Spawning occurs between late-March Inhabits moderate and high gradient,un-silted and heavily
and much of July when temperatures silted creeks and streams. Large juvenile and adults occupy
are between 15—23°C. Spawning pools that are fairly deep or that have structural shelter.
typically occurs riffles of largely gravel Feeds chiefly on midge larvae and small crustaceans.,and to a
in large creeks to large rivers. lesser extent on other aquatic insects,other arthropods,
Fecundity ranges from 20,000— snails,finger clams,other invertebrates and fish eggs.
139,000 ova.
Satinfin Shiner Spawning occurs between May and Typically inhabit warm medium-sized streams to major rivers
mid-August when temperatures are of moderate to low gradient. Can be found in pools,
between 18—30°C. Fractional backwaters,and runs of shallow to moderate depth over a
spawners that deposit eggs in crevices variety of substrates. Opportunistic feeder particularly on
of wood and other structures. drifting items,principally,microcrustaceans,terrestrial and
aquatic insects and algae.
Red Shiner Primary spawning occurs between Thrives under harsh conditions(e.g.low flow,high turbidity,
May and July. Spawning may occur on poor water quality). The red shiner spawns over an extended
riffles,on or near submerged objects, period of time from spring into fall months,with a peak from
over vegetation beds,or in association early to mid-summer.Spawning may occur on riffles,on or
with sunfish nests. near submerged objects,over vegetation beds,or in
association with sunfish nests.Adults typically school in
midwater or near the surface.
Common Carp Spawning occurs in the spring in the Tolerant of a wide range of environmental conditions.
shallow water and along shorelines in Typically found in the calm and mud-bottomed waters of
reservoirs,over vegetation,tree roots, sluggish pools,backwaters,and reservoirs where vegetation is
or open bottom,peak spawning present.Common Carp are omnivores.They ingest mouthfuls
occurs between 15 and 20°C and of the soft bottom sediments(detritus),expels them into the
usually when aquatic vegetation is water,and then feed on the disclosed insects,crustaceans,
28

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
flooded during April and May. annelid worms,mollusks,weed and tree seeds,aquatic plants,
Spawning activities create lots of and algae.
turbidity,eggs attach to vegetation or
sink into the mud. Fecundity for large
females can be over 2,000,000 ova.
Glassy Darter Spawning occurs between mid-March Inhabits warm,low and moderate-gradient creeks,streams
and mid-April when water and rivers. Primarily feeds on aquatic insects.
temperatures are between 10—19°C.
Communal breeder over hard
substrates.
Northern Spawning occurs between April and Inhabits clean,cool and warm,gravely and rocky,upland and
Hogsucker May when water temperatures are montane,large creeks to small rivers and occasionally large
between 11—23°C. Spawning occurs rivers. Young fish feed mostly on immature aquatic insects
over gravelly tails of pools,shallow and microcrustaceans,and occasionally algae. Larger fish
sides of pools,medium gravel of feeding habits are the same as young fish with the addition of
riffles,and slow to swift runs. small mollusk and rarely eggs.
Roanoke Reproduction is unwitnessed; Inhabits cool and warm,moderate to high-gradient creeks and
Hogsucker however,female gonadal conditions streams. Commonly populates rocky,gravelly,sandy,and
indicate a spawning period beginning moderately silted streams. Primarily feeds on insect larvae
with but perhaps not as long as the (mostly Diptera),algae,and detritus.
Northern Hogsucker.
Blue Catfish Spawning occurs between April and Inhabits large-river and reservoir systems with deep swift
July when water temperatures are channels and well-flowing pools. Young fish feed on small
between 21—24°C. Nests are invertebrates. Juvenile and Adults feed on an array of
constructed in sheltered areas by the invertebrates,fishes,mollusk and occasionally frogs.
male or both sexes.
Channel Spawning occurs from May through Young feed primarily on plankton and insect larvae and larger
Catfish July,between 21 and 30°C,nests are fish eat almost any available food items including other fish;
constructed in sheltered areas. found in lakes,rivers,streams occupying a in varietyof habitats
and substrates.
Green Sunfish Spawning occurs April through August, Prefer slow pools and backwaters of low-and moderate
constructs nests in colonies as shallow gradient streams and rivers,but also occur in ponds,lakes,
depressions in sand and gravel in and reservoirs. Highly tolerant of conditions such as turbidity
pools in sand and gravel near shelter and drought and can rapidly colonize new habitats. Food
such as logs and vegetation,males preferences are aquatic insects and small fishes. Frequently
guard eggs in nests. associated with vegetation and large rocky areas or rip-rap
shorelines.
Warmouth Spawning occurs from mid-spring into Inhabits pools and backwaters,swamps,lakes,and frequently
summer,occasionally early fall,starts associates with aquatic vegetation,and large rocky areas,
spawning at 21°C. Males construct a commonly associates with rip-rap shorelines in reservoirs.
solitary nest often hidden in Young feed on plankton and small insects while adults eat
vegetation and guard eggs. insects,snails,crayfishes,and fishes.
Bluegill Spawning occurs from May through Inhabits pools,lakes,streams,and rivers,with vegetation,
September,generally most of the overhead cover,structure. Young are planktivores,adults eat
growing season,peaking in June. Fish aquatic and terrestrial insects.
construct nests in aggregations in
shallow water on sand or gravel
bottoms,eggs are guarded by male.
Redbreast Spawning occurs from June thru Inhabits pool habitat,lakes,and rivers,associates with woody
Sunfish August between 16—28°C. Nests are debris,stumps,and undercut banks,abundant in upstream
constructed over sand and gravel, reaches of reservoirs,rip-rap shoreline,and rocky points. A
often with overhead cover,eggs are generalist predator that eats insects,crayfish,arthropods,
mollusks,and fishes.
29

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
adhesive and can form large clumps in
the nest,males guard eggs in the nest.
Redear Sunfish Generally,spawning occurs from April Inhabits lacustrine ecosystems,generally found in vegetated
through August,with the onset of lakes,ponds,reservoirs,streams,rivers,or backwater areas.
temperatures between 20—21°C. Generally,feeds on small prey,snails,and small mussels and
Nests found in aggregate and are clams,small insects and fishes.
constructed in waters shallower than
2 meters,often near vegetation and in
colonies,males guard eggs in the nest.
White Shiner Spawning occurs from May through Inhabits pools within cool and warm streams of moderate
July with temperatures between 17.5 gradient. Primarily feeds on aquatic and terrestrial insects.
—24°C. Spawning is typically
associated with the nest-building
chubs or other nest builders.
Crescent Spawning occurs from May through Inhabits pools of creeks,streams and small rivers of moderate
Shiner June with temperatures between 17.8 to somewhat high-gradient. Generally,feeds in the lower
—25.3°C. Spawning is typically levels of the water column with a diet primarily consisting of
associated with the nest-building aquatic insects.
chubs or other nest builders.
Rosefin Shiner Spawning occurs from April through Inhabits warm large creeks to rivers of moderate gradient.
mid or late-June when temperatures Typically found in mid and higher depths over soft and hard
are between 12.5—25.6°C. Spawning bottoms. In warmer times of the year,the Rosefin Shiner
is typically associated the nest- feeds on terrestrial insects.Also feeds on benthic aquatic
building chubs. insects,algae,and detritus.
Smallmouth Spawning occurs in May when water Inhabits cool and warm,generally clear,large creeks,streams
Bass temperatures range from 16—22°C. and rivers with gravelly and rocky substrates and a frequent
Males vigorously defend nests having succession of riffles,runs,and pools. Fingerlings exhibit the
eggs and remain aggressive for several carnivorous appetite of adults,eating microcrustaceans,
days after the eggs hatch. insects,and smaller fish. Juveniles and adults feed on
crayfishes and fishes principally,but also prey on insects.
Largemouth Spawning occurs late April to June Inhabits a wide variety of habitats.Prefer warm,calm,and
Bass when temperatures are between 16— clear water and thrive in slow streams,farm ponds,lakes,and
18°C,with peak spawning occurring in reservoirs.Young feed primarily on plankton,insects,small
April and May.Nests are generally fishes,adults feed on fishes,frogs,and almost any other
located in sand or gravel at the base animal of appropriate size.
of logs,stumps,and emergent
vegetation along shorelines usually at
depths of 0.6 meters.Both male and
female guard eggs in nest.
Blacktip Spawning occurs April through July Inhabits well-flowing to rather swift current in warm,
Jumprock when water temperatures range from moderate-gradient,large creeks to small rivers. Typically
14—23°C. occupy clean rubble,boulder,and bedrock substrates. Feeds
on insect larvae,water mites and small amounts of algae and
detritus.
Notchlip Spawning occurs in April and May Inhabits large streams,small to big rivers,and natural and
Redhorse when water temperatures range from artificial lakes. Feeds on insect larvae,microcrustaceans,
11-15°C. Spawning is typically crayfishes,mollusks,algae and detritus.
associated with shallow riffles over
gravel and rubble.
30

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Golden Spawning occurs in April—early-June Inhabits the broadest spectrum of warm-water habitats of any
Redhorse when water temperatures range from redhorse,e.g.large creeks,big rivers,natural lake,and
10—22.5°C. Spawning typically occurs impoundments,in montane to somewhat lowland areas.
over gravel beds associated with Feeds on aquatic insects,other invertebrates,detritus;and
shallow runs and riffles. Fecundity small amounts of algae.
ranges from 5,041—25,350 eggs.
V-Lip Redhorse Spawning occurs in late-April—early- Inhabits warm,medium-sized streams to medium rivers of
July. moderate or gentle gradient. Feeds on ostracods,vascular
plants,and aquatic insects.
Bluehead Chub Spawning occurs from late-April— Inhabits streams from the headwaters to points where the
early July when water temperatures stream widens to 20—30 meters. Occupies pools,runs,and
range from 12—25.3°C. Spawning is riffles,and sand to boulder and bedrock substrates.
associated with gravel-mounded nest Omnivorous species,feeding on a wide variety of aquatic
in runs,pocket areas of riffles,and insects and plant material(particularly algae).
tails of pools,generally next to a
boulder,log,or bank.
Bull Chub Spawning occurs in April—June when Inhabits major rivers and their larger tributaries. Occupies
water temperatures range from 18— pools,riffles,runs and higher flow areas of pools. Feeds on
23.3°C. Spawning is associated with benthic and drifting insects,snails,and occasionally crayfishes
gravel-mounded nest. and fishes.
Golden Shiner Spawning may occur from April thru Inhabits open water and along edges of weedy habitat,moves
August,from 15—26°C. Adhesive from shallow inshore areas to open waters following plankton
eggs are cast over rooted aquatic migrations. Feeds primarily from midwater to surface depths
vegetation,filamentous algae,gravel, on plankton,microcrustaceans,and insects,sometimes algae.
and sometime on nests of black
basses and sunfishes.
Comely Shiner Spawning occurs from April through Inhabits warm,medium streams to large rivers of moderate to
August. low gradient.
Spottail Shiner Spawning occurs from mid-April Inhabits an array of lotic habitats,ranging from typically clear,
through mid-June. Spawning occurs in mostly rocky,moderate gradient streams to often turbid,
large aggregations and in groups of sandy,muddy,silty,and sluggish water. Feeds on
two to five individuals. Fecundity microcrustaceans,aquatic and terrestrial insects,young
ranges from 100—8,898 eggs. shiners,fish eggs,and plant material.
Swallowtail Spawning occurs from mid-May Inhabits warm,clear and turbid,large creeks to large rivers of
Shiner through late July. Spawning may moderate to low gradient. Primarily a pool shiner,found near
occur over the nest of other fishes. the head and tail of pools over areas of soft and firm bottoms
and is sometimes associated with plants. Feeds on worms,
mites,microcrustaceans,aquatic and terrestrial insects,
diatoms,and filamentous algae.
Margined Spawning occurs in May and June. Inhabits low and moderate-gradient sections of large creeks
Madtom Nest are sited beneath flat rocks in to large rivers. Occupies soft and hard bottoms of pools,runs
gentle runs and in slow water above and riffles. Feeds on a variety of aquatic invertebrates,mostly
and below riffles. Fecundity ranges aquatic insect larvae,fishes and terrestrial insects are
from 53—223 eggs. occasionally taken.
Chainback Spawning occurs during April and Inhabits warm streams and rivers of low to moderate gradient
Darter May. Considered an egg-burier with and varied substrates. Feeds mainly on insects.
each spawning activity producing 15—
25 eggs.
31

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
White Crappie Spawning occurs from March through Inhabits warm ponds,lakes,reservoirs and pools of low to
July throughout the species range. moderate gradient streams and rivers. Young and juvenile
Spawning occurs when water fish feed on crustaceans and insets.Adults feed on a variety of
temperatures are between 16—20°C. fishes,insects,and other aquatic invertebrates including
Fecundity ranges from 2,900 to plankton.
213,000 mature eggs.
Black Crappie Spawning occurs from late February to Inhabits vegetated areas of backwaters in streams and rivers
early June. Nests are constructed in in ponds and reservoirs,aggregates around structure and
shallow water to moderately deep associates with aquatic vegetation,fallen trees,stumps.
water(to 6 meters),sometimes in Young Black Crappie feed on aquatic insects and small fishes
close proximity to each other and and adults feed primarily on fishes.
usually associated with vegetation or
structure,larvae are pelagic and move
inshore as larger juveniles.
Flathead Spawning occurs in June and July. Inhabits warm large streams,big rivers,lakes and reservoirs.
Catfish Nests consist of cleaned substrate In streams,young and juveniles are usually associated with
near cover or in a cavity. Fecundity riffles,while larger fish favor moderate to deep pools with
ranges from 6,900—11,300 eggs. cover. Young feed on microcrustaceans and insect larvae;
adults feed on crayfishes,clams,and particularly,fishes.
4.4 Species and Life Stages Susceptible to Impingement and
Entrainment
The MWIS design,with a TSV of less than 0.5 fps, is compliant with impingement BTA requirements of
the Rule. As such, no species or life stages are anticipated to be susceptible to impingement at the Dan
River CWIS (Table 4-6). While some species may have the potential to be entrained, based on the
operational parameters of the CWIS on the Dan River(low DIF, low AIF, and low TSV) and orientation of
the MWIS and wedgewire screens, interactions with aquatic organisms are expected to be limited with
no potential for adverse environmental impacts.
4.4.1 Impingement
The degree of vulnerability to impingement exhibited by adult and juvenile fish species depends upon
biological and behavioral factors including seasonal fish community structure, spawning effects on
distribution, habitat surrounding intake structures, high flow events, and attraction to the flow
associated with the intake. In addition, swimming speed, intake velocity,screen mesh size,trash rack
spacing, and other intake configurations will also affect the susceptibility to impingement. For example,
clupeids have high susceptibility to impingement based on multiple factors such as schooling behavior,
distribution in the water column, negative rheotactic response to intake flows, and poor swimming
performance in winter months due to lower water temperatures (Loar et al 1978). No clupeid species
were collected during the data collection period.
No ongoing or historical impingement studies have been performed at the DRCCS.The MWIS withdraws
water from the Dan River through cylindrical wedgewire screens with a TSV of less than 0.5 fps. In the
Rule, screens designed to achieve a TSV at or below 0.5 fps are compliant with the impingement
reduction standard.
32

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
4.4.2 Entrainment
Ichthyoplankton (the egg and larval life stage of fishes) exhibit the highest degree of susceptibility to
entrainment based on body size and swimming ability. Therefore, an organism is most susceptible to
entrainment for a portion of its life cycle. Larger juvenile and adult life stages have the swimming ability
to avoid entrainment. Life history characteristics can influence the vulnerability of a fish species to
entrainment. For example, broadcast spawners with non-adhesive,free-floating eggs can drift with
water currents and may become entrained in a CWIS, while nest-building species with adhesive eggs are
less susceptible to entrainment during early life stages. The habitat in the immediate vicinity MWIS is
described as pool/deep run habitat depending of the river flow. The intake structure is oriented parallel
to the river flow and is out of the main stem (Figure 4-2). The habitat within the vicinity of the DRCCS
MWIS is not preferred spawning habitat for many of the species present within the vicinity of the MWIS
(Table 4-6),thus the potential for entraining eggs and larvae is low.
01.4
C • eY •
Figure 4-2.Aerial View of the MWIS and orientation within the Dan River.
Table 4-6. Entrainment Potential for Fish(Egg and Larvae)Species Present near the DRCCS MWIS.
Species Spawning Habitat Potential for Entrainment'
(Common Name) Use/Preference
Roanoke Bass Nest constructed in shallows having Unlikely due to habitat and spawning preference,and low
coarse sand to large gravel substrate. abundance.
Rock Bass Nest constructed in shallows having Unlikely due to habitat and spawning preference,and low
coarse sand to large gravel substrate. abundance.
Snail Bullhead Cavity nesters. Unlikely due to habitat and spawning preference,and low
abundance.
Flat Bullhead Cavity nesters. Unlikely due to habitat and spawning preference,and low
abundance.
33

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Quillback Upstream spawning migration. Lays Unlikely due to habitat and spawning preference,and low
eggs over sand,silt or mud in abundance.
streams. Demersal eggs.
White Sucker Upstream spawning migration. Unlikely due to habitat and spawning preference,and low
Typical spawning occurs over riffles abundance.
of large creeks to large rivers.
Demersal eggs.
Satinfin Shiner Fractional spawners that deposit Unlikely due to habitat and spawning preference,and low
adhesive eggs in crevices of wood abundance.
and other structures.
Red Shiner Spawning may occur on riffles,on or Unlikely due to habitat and spawning preference,and low
near submerged objects,over abundance.
vegetation beds,or in association
with sunfish nests.
Common Carp Lays adhesive eggs in shallow Unlikely due to absence of vegetated habitat in the vicinity
vegetation. of the CWIS
Glassy Darter Communal breeder that deposits Unlikely due to habitat and spawning preference,and low
adhesive eggs over hard substrates. abundance.
Northern Deposits demersal eggs over gravelly Unlikely due to habitat and spawning preference,and low
Hogsucker tails of pools,shallow sides of pools, abundance.
medium gravel of riffles,and slow to
swift runs.
Roanoke Hogsucker Deposits demersal eggs over gravelly Unlikely due to habitat and spawning preference,and low
tails of pools,shallow sides of pools, abundance.
medium gravel of riffles,and slow to
swift runs.
Blue Catfish Cavity nesters,found in large open Unlikely due to habitat and spawning preference,and low
areas with woody debris,bank abundance.
cavities;moderate currents.
Channel Catfish Cavity nesters,found in large open Unlikely due to habitat and spawning preference,and low
areas with woody debris,bank abundance.
cavities;moderate currents.
Green Sunfish Construct nests around vegetation. Unlikely;limited quantity of vegetation available in the
vicinity of the CWIS
Warmouth Construct nests in cover. Unlikely;no cover near intake.
Bluegill Nest generally constructed in shallow Unlikely due to water depth in the vicinity of the CWIS,
waters. demersal and adhesive eggs,parental care of nest until
larvae swim-up.
Redbreast Sunfish Construct nests over silt-free or Likely due to relative abundance.
lightly silted sand and gravel in cover.
g Y
Redear Sunfish Nest generally constructed in shallow Unlikely due to water depth in the vicinity of the CWIS,
waters. demersal and adhesive eggs,parental care of nest until
larvae swim-up.
34

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
White Shiner Demersal eggs are deposited over Unlikely due to habitat and spawning preference,and low
nest constructed by chubs and other abundance.
nest builders.
Crescent Shiner Demersal eggs are deposited over Unlikely due to habitat and spawning preference,and low
nest constructed by chubs and other abundance.
nest builders.
Rosefin Shiner Demersal eggs are deposited over Unlikely due to habitat and spawning preference,and low
chub nest or other cyprinid nest. abundance.
Smallmouth Bass Nest constructed near shore on firm Unlikely due to habitat and spawning preference,and low
bottoms in slow currents often abundance.
adjacent to cover.
Largemouth Bass Nest constructed in shallow areas of Unlikely due to water depth in the vicinity of the CWIS.
one to six feet.
Blacktip Jumprock Deposits demersal eggs in swift Unlikely due to habitat and spawning preference,and low
water. abundance.
Notchlip Redhorse Spawning occurs in shallow riffles Unlikely due to habitat and spawning preference,and low
over gravel and rubble. abundance.
Golden Redhorse Spawning occurs over gravel beds in Unlikely due to habitat and spawning preference,and low
often very shallow runs and riffles. abundance.
V-Lip Redhorse Spawning occurs in shallow riffles Unlikely due to habitat and spawning preference,and low
over gravel and rubble. abundance.
Bluehead Chub Spawning is associated with gravel- Unlikely due to habitat and spawning preference,and low
mounded nest in runs,pocket areas abundance.
of riffles,and tails of pools,generally
next to a boulder,log,or bank.
Bull Chub Spawning is associated with gravel- Unlikely due to habitat and spawning preference,and low
mounded nest. abundance.
Golden Shiner Adhesive eggs are cast over rooted Unlikely due to habitat and spawning preference,adhesive
aquatic vegetation,filamentous and demersal eggs,relatively low abundance.
algae,gravel,and sometime on nests
of black basses and sunfishes,schools
in open water and along edges of
weedy habitat.
Comely Shiner Demersal eggs are deposited over Unlikely due to habitat and spawning preference,and low
the nest of other nest builders abundance.
(primarily chubs).
Spottail Shiner Adhesive eggs are deposited over Unlikely due to habitat and spawning preference,and low
sand and gravel in shallow riffles. abundance.
Swallowtail Shiner Adhesive eggs are deposited over Unlikely due to habitat and spawning preference,and low
nest of other fishes. abundance.
Margined Madtom Nest are sited beneath flat rocks in Unlikely due to habitat and spawning preference,and low
gentle runs and in slow water above abundance.
and below riffles.
35

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Chainback Darter Considered an egg-burier,demersal Unlikely due to habitat and spawning preference,and low
eggs are deposited over sand and abundance.
fine gravel mix in areas of rubble and
boulder at the head of,or in riffles.
White Crappie Constructs a nest on firm or soft Unlikely due to water depth in the vicinity of the CWIS,
bottoms,in open areas or under demersal and adhesive eggs,parental care of nest until
banks and other cover. Adhesive larvae swim-up.
eggs are deposited on the substrate,
algae,macrophyte leaves and tree
roots.
Black Crappie Construct nests around vegetation Unlikely due to water depth in the vicinity of the CWIS,
close to other nests. demersal and adhesive eggs,parental care of nest until
larvae swim-up.
Flathead Catfish Nest consist of cleaned substrate Unlikely due to habitat and spawning preference,and low
near cover or in a cavity. abundance.
'TSV below 0.5 fps at the MWIS will minimize potential for entrainment for all species based on their ability for avoidance of the
intake. Species with floating eggs would continue to have some susceptibility to entrainment.
4.4.3 Selected Species
A subset of species present (dominant species) in the vicinity of the DRCCS MWIS with the highest
likelihood to be entrained was selected for detailed life history descriptions including reproduction,
recruitment, and peak abundance as detailed in Freshwater Fishes of Virginia. (Jenkins 1993). The
habitat in the immediate vicinity of the MWIS is described as pool/deep run habitat depending of the
river flow. Most fish species are using the vicinity of the MWIS for staging or foraging. Of the species
present,the Redbreast Sunfish has the highest likelihood of being entrained based on species
abundance.
Redbreast Sunfish
Redbreast Sunfish are native to the Atlantic slope probably from New Brunswick to Central Florida and
are frequently found in pools and backwaters of warm, usually clear but occasionally turbid creeks,
streams, and rivers of low or moderate gradient. Fish are also found in ponds and reservoirs (Jenkins
1993). Spawning occurs when water temperatures range from 16 to 28°C with peak spawning occurring
between 20 and 28°C(Davis 1972 and Hardy 1978).
Nests are constructed by males over usually silt-free or lightly silted sand and gravel, often in association
with cover. Nests may be closely spaced, occasionally touching(Breder 1936, Richmond 1940, Davis
1972, and Jenkins 1993). Nests are typically located in calm pool margins in less than 1 meter of water,
but may be constructed in the lee of large rocks near swift current (Breder 1936, Buynak and Mohr
1978). Fecundity ranged from an average of 963 ova in age-2 females and 8,250 in age-6 fish (Gerald
1971).
Golden Redhorse
The Golden Redhorse is widespread in the southern Great Lakes basin,the Mississippi basin, and the
Mobile drainage; it is localized in the upper Hudson Bay, isolated in a few eastern lower Mississippi River
tributaries,and occupies the Atlantic slope in the Potomac,James, Chowan, and Roanoke drainages
36

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
(Jenkins 1993). Golden Redhorse occupies about the broadest spectrum of warm water habitats of any
redhorse;for example, large creeks, big rivers, natural lakes, and impoundments, in montane to
somewhat lowland areas (Jenkins 1970). Highest abundances occur in moderately clear, un-polluted
streams with large permanent poos and well-defined rocky riffles (Pflieger 1975 and Trautman 1981). In
streams,the species is essentially restricted to pools (except during the spawning period), occurring
over silt, sand,gravel, rubble, and bedrock. Spawning in Virginia typically occurs in April and May when
water temperatures are between 19.5 and 21.5°C(Jenkins 1993).
Spawning sites are gravel beds in often very shallow runs and riffles. A trio of two males and one female
consummate the typical spawning act, as in most suckers. Males are highly aggressive, defending
spawning sites or individual distances usually by forceful butting with the ram of the snout tubercles.
Repeated localized spawning sometimes results in shallow substrate depression (Jenkins 1993).
Fecundity ranges from 5,041—23,350 eggs (Meyer 1962,Smith 1977, Curry and Spacie 1984, and Becker
1983).
V-Lip Redhorse
V-Lip Redhorse occupies the major Atlantic slope drainages from the Chowan and Roanoke south to the
Santee in South Carolina favoring warm, medium-sized streams to medium rivers of moderate or gentle
gradient. Inhabits streams that are clear and some that most often are slightly or moderately turbid and
moderately silted. Large juveniles and adults occur in pools,foraging there and into runs;young and
small juveniles often are found in calm shallows. All stages occur over a variety of soft and hard
bottoms. Based on tuberculation and gonad development,V-Lip Redhorse apparently is the latest-
spawning Redhorse in Virginia. Spawning starts in late-April and early-May and lasting through July
(Jenkins 1993).
White Shiner
The White Shiner is indigenous to the drainages from the Chowan south to the Cape Fear, and in the
New. It ranges from mountains to the Fall Line with few populations occurring in the upper Coastal
Plain. The White Shiner is principally a pool inhabitant in cool and warm streams of moderate gradient;
it occurs less frequently in fast water and is found over firm and soft bottoms including moderately
silted ones. Spawning is typically associated with Bullhead Chub nests between May and July when
water temperatures range from 17.5—24°C(Jenkins 1993).
Comely Shiner
The Comely Shiner ranges on the Atlantic slope from the Hudson to the Pee Dee drainage and is known
long ago from a Finger Lakes tributary. The Comely Shiner typically occupies warm, medium streams to
large rivers of moderate to low gradient. The preferred habitat includes a variety of substrates and is
usually associated with slow runs and pools adjacent to moderate current. Large adults have been
found to be associated with swift riffles. Little has been published on the life history of the Comely
Shiner(Jenkins 1993), however spawning is known to occur from early-April through late-August
(Snelson 1968).
Bluegill
Bluegill are native to the Great Lakes-St. Lawrence and Mississippi basins,the Atlantic slope probably
from North Carolina southward, and the Gulf slope west to Texas. It is the most widely introduced
species of Sunfish (Jenkins 1993). Bluegills are found in pools and backwaters of low to moderate-
37

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
gradient creeks, streams, and rivers, and in all types of lacustrine habitats. The Bluegill occupies clear
and turbid waters, hard and silted substrates (Grahm and Hastings 1984). Spawning likely occurs from
May to August or September.
Spawning typically occurs over nest constructed by Males in shallows on sand or gravel; nest frequently
occur in colonies (Coggeshall 1924, Crowe 1959, and Gross and MacMillan 1981). Bluegill average five
spawnings and produce about 80,000 eggs per year.
Largemouth Bass
Largemouth Bass are native to the Great Lakes-St. Lawrence and Mississippi basins and the Gulf and
south Atlantic slopes; both subspecies have been widely transplanted in North American and beyond
(Robbins and MacCrimmon 1974). Largemouth Bass inhabits marshes,swamps, ponds, lakes, reservoirs,
and creeks to large rivers. In lotic situations (like the Dan River) it occupies pools and backwaters.
Largemouth Bass prefer warm,generally clear water, and are less tolerant of turbidity than the Spotted
Bass (Trautman 1981). Spawning occurs in the spring (May and June)when water temperatures
approach 16—18°C and continue to 24°C(Carlander 1977).
Males fan out a nest and guard it against intruders;sometime spawning occurs on unprepared bottoms.
Nests are made on a variety of substrates in pools and backwaters of streams and along the shores of
ponds and reservoirs at a depth of 0.3—0.6 meters typically, but up to 8.2 meters deep (Carlander
1977). Nests may be found in open settings or in association with ledges, logs, or aquatic macrophytes,
and may be well spaced or crowded.
Bull Chub
The Bull Chub occurs in the James, Chowan, Roanoke,Tar and Neuse river drainages in Virginia and
North Carolina. Bull Chubs typically occupy major rivers and their larger tributaries; populations in
smaller(8—12 meters wide)streams also are strong. The species occupies both fast and slow water;
large individuals are most often found in pools,while small ones are found in riffles, runs, and well-
flowing parts of pools (Jenkins 1993). Spawning typically occurs in May and June when water
temperatures range from 18—23.3°C.
Spawning occurs over nest or gravel mounds constructed in runs, pocket areas of riffles and tails of
pools,general next to a boulder, log, or bank(Lachner and Wiley 1971
Snail Bullhead
The northern most range of the Snail Bullhead is the Dan River system. The Snail Bullhead occupies
warm, medium to large streams and rivers (Jenkins 1993). It is thought by Verger and Relyea (1968)to
favor higher-gradient rocky sections and to inhabit well-flowing pools and riffles. Spawning behaviors
have been essentially unstudied but are reported to be similar to the Flat Bullhead which spawn in June
and July when water temperatures range from 21—24°C. The spawning behavior of the Flat Bullhead
has not been reported (Olmsted and Cloutman 1979).
38

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
4.5 Threatened, Endangered, and Other Protected Species
Susceptible to Impingement and Entrainment at the MWIS
The Rule requires the permittee to document the presence of federally listed species and designated
critical habitat in the action area (see 40 CFR 125.98[f]). For the purpose of defining listed species,the
action area is defined as a one-mile radius around the Dan River CWIS.
A desktop review of available resources was performed to develop a list of species with protected,
endangered, or threatened status that might be susceptible to impingement and entrainment at the
CWIS on the Dan River. The USFWS's map-based search tool (Information for Planning and Consultation
[IPaC])was used to identify state or federally listed rare,threatened,or endangered (RTE) aquatic
species or critical habitat designations within the defined search area. Listed species spatial occurrence
data from the North Carolina Natural Heritage Program was cross-referenced spatially with the Dan
River CWIS. Because the Dan River CWIS is in a freshwater environment, marine and anadromous
federally listed species and designated critical habitat under National Marine Fisheries Service
jurisdiction were not considered.
State or federally listed rare,threatened, or endangered (RTE)aquatic species or critical habitat
designations occurring within the vicinity of the Dan River CWIS, are provided in Table 4-7. Federal
species of concern and candidate species were omitted from the list (unless they were also state
threatened or endangered), as there are no requirements to address those species under the Rule or
Section 7 of the ESA. The following materials were reviewed to develop the species list in Table 4-7:
• IPaC(https://ecos.fws.gov/ipac/) (USFWS 2020)for the search area shown on Figure 4-1, and
• North Carolina Department of Natural and Cultural Resources (NCDNCR) Natural Heritage
Program Data explorer listed species element occurrence data (NCDNCR 2020).
Dan River Long Term monitoring results discussed in Section 4.2 of this report resulted in no collections
of federally or state-listed species from 2015 to 2017. The UFWS IPAC search indicated that the
Roanoke Logperch (Percina rex) might be affected by activities in the search location (1.0-mile
circumference of the Dan River CWIS). The CWIS is outside of any critical habitat designation and is not
included in any of the known or managed populations (USFWS 2021). The Roanoke Logperch is not
likely to occur in the vicinity of the CWIS as most collections have occurred in the upper Dan and Smith
rivers, not below the confluence.
Table 4-7.Summary of Rare,Threatened,or Endangered(RTE)Aquatic Species Listed for Rockingham County,
North Carolina,and Record of Occurrence of Potential to Occur Near the DRCCS MWIS.
Scientific Common Federal Record of occurrence or potential to
Source Name Name Status* State Status occur Near the Dan River CWIS
USFWS Percina rex Roanoke Endangered Endangered Not likely to occur,most collection records
Logperch are above the confluence of the Dan and
Smith Rivers. The Dan River CWIS is below
the confluence and the habitat type is not
preferred.
NCNHP Moxostoma Bigeye n/a Threatened Unlikely as none were collected in the
arimomum Jumprock vicinity of the CWIS. Preferred habitat is
not present in the vicinity of the CWIS.
39

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
NCNHP Ambloplites Roanoke Bass n/a Rare Unlikely as none were collected in the
cavifrons vicinity of the CWIS. Preferred habitat is
not present in the vicinity of the CWIS.
NCNHP Carpiodes Quillback n/a Rare Unlikely as few were collected in the
cyprinus vicinity of the CWIS.
NCNHP Etheostoma Riverweed n/a Rare Unlikely as none were collected in the
podostemone Darter vicinity of the CWIS. Preferred habitat is
not present in the vicinity of the CWIS.
NCNHP Exoglossum Cutlip Minnow n/a Concern Unlikely as none were collected in the
maxillingua vicinity of the CWIS. Preferred habitat is
not present in the vicinity of the CWIS.
USFWS Fusconaia Atlantic Pigtoe Proposed n/a Unlikely as none were collected in the
masoni Threatened vicinity of the CWIS. Preferred habitat is
not present in the vicinity of the CWIS.
USFWS Parvospina James Endangered Endangered Unlikely as none were collected in the
collina Spinymussel vicinity of the CWIS. Preferred habitat is
not present in the vicinity of the CWIS.
NCNHP Strophitus Creeper n/a Threatened Unlikely as none were collected in the
undulates vicinity of the CWIS. Preferred habitat is
not present in the vicinity of the CWIS.
NCNHP Villoso Notched n/a Threatened Unlikely as none were collected in the
constricts Rainbow vicinity of the CWIS. Preferred habitat is
not present in the vicinity of the CWIS.
NCNHP Villosa delumbis Eastern n/a Rare Unlikely as none were collected in the
Creekshell vicinity of the CWIS. Preferred habitat is
not present in the vicinity of the CWIS.
NCNHP Lampsilis Yellow n/a Endangered Unlikely as none were collected in the
cariosa Lampmussel vicinity of the CWIS. Preferred habitat is
not present in the vicinity of the CWIS.
NCNHP Lasmigona Green Floater n/a Endangered Unlikely,however they are present in the
subviridis vicinity of the CWIS.
40

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
4.6 Documentation of Consultation with Services
In preparing this response package for compliance with the Rule,there has been neither public
participation, nor coordination undertaken with the USFWS or NMFS. Duke Energy has not submitted
information to obtain incidental take exemption or authorization from any Agency.
4.7 Incidental Take Exemption or Authorization from Services
Duke Energy has not submitted information to obtain incidental take exemption or authorization from
the Services.
4.8 Methods and Quality Assurance Procedures for Field Efforts
Data presented in this report were compiled from Duke Energy's Dan River Long-Term Environmental
Monitoring Program (Duke Energy 2019). All data were collected according to NCDEQ approved
procedures under the Duke Energy Progress Biological Laboratory Certification number 006.
4.9 Fragile Species
In the Rule,the EPA identifies 14 species of fish as fragile or having post-impingement survival rates of
less than 30 percent. Occurrence of fragile species in the Dan River system have been documented, but
none were collected in the vicinity of the CWIS (Table 4-8).
Table 4-8. List of Fragile Species as Defined by the EPA and Their Occurrence in the Vicinity of the DRCCS MWIS.
Scientific Name Common Name Occurrence in vicinity of the Dan
River CWIS*
Alosa pseudoharengus Alewife No
Alosa sapidissima American Shad No
Clupea harengus Atlantic Herring No
Doryteuthis (Amerigo) Atlantic Long-fin Squid No
pealeii
Anchoa mitchilli Bay Anchovy No
Alosa aestivalis Blueback Herring No
Pomatomus saltatrix Bluefish No
Poronotus triacanthus Butterfish No
Lutjanus griseus Grey Snapper No
Alosa mediocris Hickory Shad No
Brevoortia tyrannus Atlantic Menhaden No
Osmerus mordax Rainbow Smelt No
Etrumeus sadina Round Herring No
Engraulis eurystole Silver Anchovy No
41

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
5 Cooling Water System Data [§122.21(r)(5)(i)]
The information required to be submitted per 40 CFR§122.21(r)(5), Cooling water system data, is
outlined as follows:
(I) A narrative description of the operation of the cooling water system and its relationship to
cooling water intake structures;the proportion of the design intake flow that is used in the system;the
number of days of the year the cooling water system is in operation and seasonal changes in the
operation of the system, if applicable;the proportion of design intake flow for contact cooling, non-
contact cooling, and process uses; a distribution of water reuse to include cooling water reused as
process water, process water reused for cooling, and the use of gray water for cooling;a description of
reductions in total water withdrawals including cooling water intake flow reductions already achieved
through minimized process water withdrawals; a description of any cooling water that is used in a
manufacturing process either before or after it is used for cooling, including other recycled process
water flows;the proportion of the source waterbody withdrawn (on a monthly basis);
(ii) Design and engineering calculations prepared by a qualified professional and supporting data to
support the description required by paragraph (r)(5)(i)of this section; and,
(iii) Description of existing impingement and entrainment technologies or operational measures and
a summary of their performance, including but not limited to reductions in impingement mortality and
entrainment due to intake location and reductions in total water withdrawals and usage.
Each of these requirements is described in the following subsections.
5.1 Description of Cooling Water System Operation
[§122.21(r)(5)(i)]
The DRCCS circulating water system is a closed-loop system with cooling water recycled and reused in
the steam turbine condenser. The purpose of the circulating water system is to supply cooling water to
the main and auxiliary steam condensers,the cooling water chiller system, and to be used as service
water for various plant uses such as fire water, boiler area wash water, and makeup water to the HRSG.
The heat transferred to the circulating water in the condenser is rejected to the atmosphere by the
evaporation process in the cooling tower. Approximately 94 percent of water withdrawn by the MWIS is
used for cooling tower makeup.
5.1.1 Cooling Water System Operation
Two vertical circulating water pumps, each rated at 135.4 MGD (94,000 gpm) supply cooling water to
the condenser and additional circulating water to the auxiliary cooling water heat exchangers. Heated
water from these systems is returned to the cooling tower through the circulating water piping. The
heated circulating water is cooled by the cooling tower and then collected in the cooling tower basin
where it flows back to the circulation pumps, and the cycle is repeated. The DRCCS has one mechanical
draft counterflow cooling tower equipped with ten cooling cells, motor-driven fans, and two pumps in
the tower basin to recirculate the cooling water to the condenser. Figure 5-1 provides a schematic of
the DRCCS cooling tower.
42

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
The cooling tower is always in operation whenever the DRCCS is in operation. The cooling tower is
designed to operate with at least eight of the ten cells in operation. Typically, during the warmer
months of the year(mid-May to mid-October)all ten cells of the cooling tower are in service.
Most of water losses in the circulating water system is through evaporation in the cooling tower.
Evaporation does not carry away solids in the water such as mud, silt, or dissolved solids; therefore, it is
necessary to continuously discharge some of the circulating water to remove waste and prevent a
buildup of solids in the circulating water. This discharge, called blowdown, is routed to Outfall 001.
The cooling tower has five main components:
1. the blower type fans which direct the airflow upward,
2. the heat transfer section commonly called the "fill",
3. the water distribution system,
4. the drift eliminator section,and
5. the concrete basin which collects water for return to the condenser and other heat exchangers.
c
,..,..=Alga
111\1 �` jj
ow j 1 (IPA\ 1/Q�4 l�W �'•$��01 Aril i
\ —
r.<.s r...v.b EA wEw ,..� . ..,N. ,r.,.
imuetidr
pa II I I►.' II III V I.
Fgm LONGIBUCIALACN E .^' .rv. ..
Figure 5-1. DRCCS Cooling Tower General Arrangement
5.1.2 Proportion of Design Flow Used in the Cooling Water System
Water withdrawals from Dan River to support DRCCS operations from 2016 through 2020 are provided
in Table 3-1 (Section 3.4). Based on the engineering design water balance diagram (Figure 3-1),
approximately 94 percent of the MWIS withdrawal is used for makeup to the cooling tower. The
remainder is used as service water for various plant uses such as fire protection water, boiler wash
water, and HRSG makeup water. Table 5-1 provides the proportion of the 7.2 MGD DIF withdrawn
during the 2016-2020 period.
43

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Table 5-1. Percent Monthly Proportion of Design Flow Withdrawn at the DRCCS.
Month 2016 2017 2018 2019 2020 Average
January 42.9 43.4 44.9 49.8 44.9 45.2
February 43.9 48.7 50.1 52.5 47.2 48.5
March 44.5 49.7 51.5 54.6 49.8 50.0
April 46.4 23.5 39.6 43.8 28.9 36.4
May 33.2 47.6 56.3 61.3 44.1 48.5
June 51.1 56.3 54.5 61.4 55.2 55.7
July 54.4 58.4 64.5 67.6 62.1 61.4
August 53.9 58.9 63.4 68.6 55.3 60.0
September 54.6 54.6 40.4 63.5 49.5 52.5
October 38.4 42.9 46.9 37.0 49.0 42.8
November 53.2 53.6 54.5 1.8 42.4 41.1
December 40.9 47.1 46.2 35.0 19.1 37.7
Although historical averages are not necessarily indicative of future withdrawals,only 48.3 percent of
the DIF was withdrawn from the Dan River from 2016 through 2020.
5.1.3 Cooling Water System Operation Characterization
Operation of the cooling water system results in an increased makeup water demand and makeup water
pump operation. As presented in Section 3.3,the MWIS operated nearly continuously during the 2016-
2019 period with an average daily operation of approximately 21.8 hours each day(i.e., about 91%each
day). Steam turbine and/or combustion turbine outages typically occur in the spring and/or fall.
Monthly total flow data during the 2016-2020 period are provided n Figure 5-2. MWIS withdrawals
during the summer months (i.e., May to September) are typically higher than the remainder of the year
due to increased cooling tower evaporation due to higher ambient temperatures.
44

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
160.0
140.0 —
120.0 �,. . ---
0
c.9 60.0 -- II
2
40.0 —-------i • -
20.0 I I 11
�e9 �o Qe
■ 2016 ■2017 ■ 2018 ■2019 ■2020
Figure 5-2. Monthly Total MWIS Withdrawals at DRCCS
At the DIF (5,000 gpm) the calculated TSV is 0.15 fps while at the AIF (2,417 gpm)the calculated TSV is
0.07 fps. Both of these values are considerably less than the 0.5 fps alternative in the 316(b) Rule for
impingement compliance. Appendix C provides TSV calculations.
5.1.4 Distribution of Water Reuse
The distribution of water reuse does not apply to DRCCS because this facility does not reuse cooling
water as process water, reuse process water for cooling purposes, or use grey water for cooling
purposes.
5.1.5 Description of Reductions in Total Water Withdrawals
With the retirement of DRSS Units 1-3, maximum water withdrawals from the Dan River have been
reduced by 97.5 percent (i.e., 7.2 MGD vs. 285.1 MGD). The DRCCS is a single combined cycle unit,
natural gas-fired electric generating facility with a current generating capacity of 718 MW. The DRCCS
has a DIF of 7.2 MGD and an average AIF of 3.48 MGD for 2016-2020. As shown in Table 5 2,the DRCCS
is more efficient in cooling water usage, producing 2.3 times more power output while using 97.5
percent less cooling water compared to the retired DRSS at design flows and 98.8 less at actual
withdrawal flows.
45

316(b) Compliance Submittal
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Table 5-2.Comparison of DRSS and DRCCS.
Characteristic DRSS DRCCS
Total Generation,MW 290 718
Fuel Coal Natural Gas
Total Design Withdrawal, MGD 285.12 7.2
Cooling System Once-Through Closed-Cycle
MW/MGD Ratio 1.01 99.7
5.1.6 Description of Cooling Water Used in Manufacturing Process
DRCCS cooling water is not used in a manufacturing process either before or after the water is used for
cooling.
5.1.7 Proportion of Source Waterbody Withdrawn
Withdrawal from the Dan River is dependent on the cooling tower makeup water demand, maximum
pump capacity, and water losses due to evaporation and system losses. Monthly average Dan River
flows and monthly average DRCCS water withdrawals during the 2016-2020 period are provided in Table
5-3. The percent of source water withdrawal ranges from a low of 0.01 percent (November 2019) to a
high of 0.88 percent (November 2016).
Table 5-3. DRCCS Percent of Source Waterbody(Dan River)Withdrawal
Month 2016 2017 2018 2019 2020
January 0.17 0.27 0.58 0.12 0.21
February 0.11 0.52 0.26 0.11 0.08
March 0.20 0.53 0.34 0.17 0.27
April 0.25 0.06 0.18 0.14 0.10
May 0.11 0.12 0.19 0.32 0.06
June 0.37 0.26 0.54 0.21 0.18
July 0.43 0.58 0.63 0.49 0.40
August 0.34 0.72 0.34 0.68 0.23
September 0.72 0.71 0.10 0.87 0.28
October 0.38 0.65 0.12 0.33 0.17
November 0.88 0.87 0.15 0.01 0.08
December 0.56 0.74 0.09 0.17 0.05
Annual 0.26 0.33 0.20 0.21 0.13
Average
During the 2016-2020 period of record for this report, the DRCCS average withdrawal was 0.23 percent
of the Dan River source waterbody flow. [insert Table 5-3 with updated data from last five years]
5.2 Design and Engineering Calculations [§122.21(r)(5)(ii)]
The following table provides calculated TSV values. Appendix C presents the engineering calculations of
TSV for the cylindrical wedgewire screen design as prepared by a qualified professional.
46

316(b) Compliance Submittal
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Table 5-4. MWIS TSV Calculations
Flow Scenario Calculated TSV
AIF (2016-2020) 0.07 fps
DIF (two pumps) 0.15 fps
Maximum possible(three pumps) 0.22 fps
5.3 Description of Existing Impingement and Entrainment
Reduction Measures [§122.21(r)(5)(iii)]
The DRCCS achieves substantial reductions in entrainment and impingement by means of flow
reduction. The underlying assumption for entrainment is that entrainable organisms have limited or no
motility and passively move with the water entering the power plant;therefore, reduction in flow
results in a commensurate reduction in entrainment.This flow reduction is achieved through the use of
mechanical draft wet cooling towers. Utilization of closed-cycle cooling results in a flow reduction of
97.6 percent relative to OTC at DRCCS.
In addition to providing a significant reduction of organisms entrained,the lower flows associated with
closed-cycle cooling also result in a commensurate reduction in the potential for impingement at the
facility. As the MWIS wedgewire screens have a maximum TSV of 0.15 fps at the DIF,the risk of
impingement is essentially eliminated. The annual average AIF of 3.2 MGD at DRCCS(see Section 3.4) is
small and the calculated TSV is 0.07 fps. Thus,the MWIS AOI would not extend beyond the face of the
screens and is substantially less than the source waterbody current. Based on the AOI calculations,
impingement at DRCCS is negligible and more likely approaches zero.
5.3.1 Best Technology Available for Entrainment
To aid the Director in making a BTA determination, the following is provided to support the conclusion
that the existing DRCCS configuration and operation results in the maximum reduction in entrainment
warranted and no additional entrainment controls are warranted.
Most importantly,the DRCCS uses closed-cycle cooling,which minimizes entrainment through flow
reduction. The flow reduction achieved, compared to OTC, is calculated at 97.6 percent based on 3.0
COC. The EPA allows broad flexibility in the BTA determination for individual facilities, but also supports
closed-cycle cooling as a BTA option for entrainment as confirmed through this statement in the
preamble to the Rule:
"Although this rule leaves the BTA entrainment determination to the Director,with the
possible BTA decisions ranging from no additional controls to closed-cycle recirculating
systems plus additional controls as warranted, EPA expects that the Director, in the site-
specific permitting proceeding, will determine that facilities with properly operated
closed-cycle recirculating systems do not require additional entrainment reduction
control measures."
Closed-cycle cooling as a potential entrainment BTA is further reiterated in the Response to Public
Comments document,where EPA states:
47

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
"EPA has made it clear that a facility that uses a closed-cycle recirculating system, as
defined in the rule,would meet the rule requirements for impingement mortality at§
125.94(c)(1).This rule language specifically identifies closed-cycle as a compliance
alternative for the [impingement mortality] performance standards. EPA expects the
Director would conclude that such a facility would not be subject to additional
entrainment controls to meet BTA."
The final rule for new facilities as well as the new units provision within the Rule provide similar support
for closed-cycle cooling as entrainment BTA at DRCCS:
• The final Rule for new facilities published in the Federal Register on December 18, 2001 and
with an effective date of January 17, 2002 does prescribe BTA for entrainment, which DRCCS
meets. Regulations are more stringent for new facilities than for existing facilities. By virtue of
meeting the most stringent entrainment BTA criteria (i.e., applicable to new facilities), DRCCS is
compliant for entrainment BTA under the final Rule for existing facilities.
• If DRCCS were classified as a new unit at an existing facility,the station would be in compliance
with the more stringent requirements stated at§125.94(e), BTA standards for impingement
mortality and entrainment for new units at existing facilities.
Beyond this regulatory guidance,the number of organisms expected to be entrained at DRCCS is very
low. Since entrainment is proportional to flow, reductions in flow equate to commensurate reductions
in entrainment. The use of closed-cycle cooling as compared to an equivalent OTC facility is estimated
to reduce entrainment by 97.5 percent.
48

316(b)Compliance Submittal
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6 Chosen Method(s) of Compliance with
Impingement Mortality Standard [§122.21(r)(6)]
The information required to be submitted per 40 CFR§ 122.21(r)(6) is as follows:
The owner or operator of the facility must identify the chosen compliance method for the
entire facility;alternatively, the applicant must identify the chosen compliance method
for each cooling water intake structure at its facility. The applicant must identify any
intake structure for which a BTA determination for Impingement Mortality under 40 CFR
125.94(c)(11)or(12)is requested.
The Rule at 40 CFR 125.94(c)gives existing facilities seven BTA options for achieving impingement
mortality compliance.These are listed below. A facility needs to implement only one of these options.
1. Operate a closed-cycle recirculating system as defined at 40 CFR 125.92(c)(1) (this includes wet,
dry or hybrid cooling towers, a system of impoundments that are not WOTUS, or any
combination thereof);
2. Operate a cooling water intake structure that has a maximum design through-screen velocity of
0.5 fps or less;
3. Operate a cooling water intake structure that has a maximum actual through-screen velocity of
0.5 fps or less;
4. Operate an existing offshore velocity cap that is a minimum of 800 feet offshore and has bar
screens or otherwise excludes marine mammals,sea turtles, and other large aquatic organisms;
5. Operate a modified traveling screen system such as modified Ristroph screens with a fish
handling and return system, dual flow screens with smooth mesh, or rotary screens with fish
returns. Demonstrate that the technology is or will be optimized to minimize impingement
mortality of all non-fragile species;
6. Operate any combination of technologies, management practices, and operational measures
that the Director determines is BTA for reducing impingement. As appropriate to the system of
protective measures implemented, demonstrate the system of technologies has been optimized
to minimize impingement mortality of all non-fragile species; and
7. Achieve a 12-month performance standard of no more than 24 percent mortality including
latent mortality for all non-fragile species.
Compliance options 1, 2, and 4 are essentially pre-approved technologies that require minimal
additional monitoring after their installation and proper operation. Options 3, 5, and 6 require that
more detailed information be submitted to the Director before they can be specified as the BTA to
reduce impingement mortality. Options 5, 6,and 7 require demonstrations with field studies that the
technologies have been optimized to minimize impingement mortality of non-fragile species.
In addition,the Rule provides two other impingement compliance BTA options for which the Director
may consider little or no additional controls for impingement mortality (USEPA 2014a). These options
apply under very specific circumstances.
49

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
• De minimis rate of impingement—if the rates of impingement at a facility are so low that
additional impingement controls may not be justified (Section 125.94(c)(11));and
• Low Capacity utilization of generating units—if the annual average capacity utilization rate of a
24-month contiguous period is less than 8 percent(Section 125.94(c)(12)).
The DRCCS meets the requirements of 40 CFR§125.94(c)(1) (BTA Option#1) based on data provided in
Table 5-2. In addition,the MWIS has a design and actual through-screen velocity of<0.5 fps and
therefore is compliant with the requirements of 40 CFR §125.94(c)(2) and (3) (BTA Options 2 and 3).
By meeting the CCRS criterion (BTA#1)the existing technologies in use at the DRCCS are BTA for
impingement mortality compliance. Furthermore,the MWIS has a design through-screen velocity that is
lower than the 0.5fps standard for impingement mortality compliance.
50

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
7 Entrainment Performance Studies [§ 122.21(r)(7)]
The information required to be submitted per 40 CFR§ 122.21(r)(7), Entrainment performance studies,
is as follows:
The owner or operator of an existing facility must submit any previously conducted
studies or studies obtained from other facilities addressing technology efficacy, through-
facility entrainment survival, and other entrainment studies.Any such submittals must
include a description of each study, together with underlying data, and a summary of
any conclusions or results.Any studies conducted at other locations must include an
explanation as to why the data from other locations are relevant and representative of
conditions at your facility. In the case of studies more than 10 years old, the applicant
must explain why the data are still relevant and representative of conditions at the
facility and explain how the data should be interpreted using the definition of
entrainment at 40 CFR 125.92(h).
7.1 Site-Specific Studies
DRCCS utilizes a CCRS,therefore entrainment (and survival) is not anticipated. Hence, no site-specific
entrainment performance studies (such as studies evaluating biological efficacy of specific entrainment
reducing technologies or through-facility entrainment survival) have been conducted for the DRCCS.
Section 4 of this report provides a discussion of fishery monitoring conducted at or near the facility.
Section 5.3 contains information regarding entrainment reductions resulting from lower cooling water
withdrawals of the DRCCS as compared to the prior DRSS.
7.2 Studies Conducted at Other Locations
As of the date of this report, no entrainment performance studies conducted at other facilities have
been determined relevant for documentation in this section.
51

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
8 Operational Status [§ 122.21(r)(8)]
The information required to be submitted per 40 CFR §122.21(r)(8), Operational status, is outlined as
follows:
(i) For power production or steam generation, descriptions of individual unit operating
status including age of each unit, capacity utilization rate(or equivalent)for the
previous 5 years, including any extended or unusual outages that significantly affect
current data for flow, impingement, entrainment, or other factors, including
identification of any operating unit with a capacity utilization rate of less than 8 percent
averaged over a 24-month block contiguous period, and any major upgrades completed
within the last 15 years, including but not limited to boiler replacement, condenser
replacement,turbine replacement, or changes to fuel type;
(ii) Descriptions of completed, approved, or scheduled uprates and Nuclear Regulatory
Commission relicensing status of each unit at nuclear facilities;
(iii) For process units at your facility that use cooling water other than for power production
or steam generation, if you intend to use reductions in flow or changes in operations to
meet the requirements of 40 CFR 125.94(c), descriptions of individual production
processes and product lines, operating status including age of each line,seasonal
operation, including any extended or unusual outages that significantly affect current
data for flow, impingement, entrainment, or other factors, any major upgrades
completed within the last 15 years, and plans or schedules for decommissioning or
replacement of process units or production processes and product lines;
(iv) For all manufacturing facilities, descriptions of current and future production schedules;
and,
(v) Descriptions of plans or schedules for any new units planned within the next 5 years.
Each of these requirements is described in the following subsections.
8.1 Description of Operating Status [§ 122.21(r)(8)(i)]
DRCCS is normally used for base load generation. Plant outages typically occur during the spring
(February to May) and/or in the fall/winter(October to December) months.
8.1.1 Individual Unit Age
DRCCS began commercial operations in December 2012. According to the Duke Energy Carolinas 2020
Integrated Resource Plan (IRP),there is no current projected retirement date for the DRCCS.
8.1.2 Utilization for Previous Five Years
Monthly and annual average capacity factor information for 2016-2020 is provided in Table 8-1. Annual
capacity factors during this period ranged from 72.6 to 82.1 percent.
52

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Table 8-1. DRCCS Annual Capacity Factors,2016-2020.
Month 2016 2017 2018 2019 2020
January 82.2 80.6 86.4 86.1 80.1
February 88.6 82.2 86.8 88.7 83.0
March 76.2 84.9 85.8 88.8 78.7
April 75.5 36.3 56.1 49.5 43.8
May 54.7 82.7 88.3 89.2 72.5
June 86.0 90.5 79.0 88.6 84.4
July 87.9 91.4 96.0 93.4 91.5
August 85.6 92.8 96.4 93.1 86.4
September 88.6 90.6 64.5 89.8 80.8
October 57.6 68.1 77.6 50.8 80.1
November 91.2 90.9 89.4 0.2 72.0
December 80.6 82.9 78.8 59.8 31.6
Annual Average 79.4 80.9 82.1 72.6 73.4
Note:Annual average may not equal monthly total average due to rounding.
8.1.3 Major Upgrades in Last Fifteen Years
As part of a modernization effort, Duke Energy retired DRSS coal-fired generating Units 1-3 in 2012 and
replaced them with a new, more efficient, natural gas-fired combined cycle facility on the existing site.
DRCCS began commercial operations in December 2012.
8.2 Description of Consultation with Nuclear Regulatory
Commission [§122.21(r)(8)(ii)]
The DRCCS is not a nuclear fueled unit;therefore,this subsection is not applicable.
8.3 Other Cooling Water Uses for Process Units [§122.21(r)(8)(iii)]
The DRCCS is not a manufacturing facility;therefore,this subsection is not applicable.
8.4 Description of Current and Future Production Schedules
[§122.21(r)(8)(iv)]
The DRCCS is not a manufacturing facility;therefore,this subsection is not applicable.
8.5 Description of Plans or Schedules for New Units Planned within
Five Years [§122.21(r)(8)(v)]
During the next five years,there are no plans to decommission, replace, or add new units at this facility
as stated in the 2020 IRP.
53

1
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DAN RIVER COMBINED CYCLE STATION
9 References
Becker, G. C. 1983. Fishes of Wisconsin. University of Wisconsin Press, Madison WI.
Breder, C. M. 1936.The reproductive habits of North American sunfishes (family Centrarchidae.
Zoologica (New York) 21:1-48.
Buynak, G. L., and Morh, H. W. 1978. Larval development of the Redbreast Sunfish (Lepomis auratus)
from the Sesquehanna River.Transactions of the American Fisheries Society 107:600-604.
Carlander, K.D. 1977. Handbook of Freshwater Fishery Biology.Vol. 2. The Iowa State University Press,
Ames IA. 431 pp.
Coggeshall, L.T. 1924. A study of the productivity and breading habits of the Bluegill, Lepomis pallidus
(Mitch.). Proceedings of Indiana Academy of Science 33:315-320.
Crowe,W. R. 1959.The Bluegill in Michigan. Michigan Department of Conservation Fish Division
Pamphlet 31.
Curry, K. D., and A. Spacie. 1984. Differential use of stream habitat by spawning catostomids. American
Midland Naturalist 111:267-279.
Davis,J. R. 1972.The spawning behavior,fecundity rates, and food habits of the Redbreast Sunfish in
southeastern North Carolina. Proceedings of the Annual Conference Southeastern Association of
Came and Fish Commissioners 25(1971):556-560.
Duke Energy. 2019. Dan River Long-Term Environmental Monitoring Report. Water Resources. Raleigh
NC.
Ehrlich, K. F. 1974. Chemical changes during growth and starvation of herring larvae. Pages 301-323 in J.
H. S. Blaxter, editor.The early life history of fish. Springer-Verlag, New York.
Gebhart,Glen E., and Robert C. Summerfelt. 1978. Seasonal Growth of Fishes in Relation to Conditions
of Lake Stratification. Oklahoma Cooperative Fishery Research Unit 58 (1978): 6-10. Oklahoma
State University, Stillwater OK.
Gerald,J. W. 1971. Sound production during courtship in six species of sunfish (Centrarchidae). Evolution
25:75-87.
Graham,J. H., and Hastings, R.W. 1984. Distributional patterns of sunfishes on the New Jersey Coastal
Plain. Environmental Biology of Fishes 10:137-148.
Griffith, G.E., Omemik,J.M., Comstock, M.P.,Schafale,W.H., McNab, D.R., Lenat, D.R., and MacPherson,
T.F. 2002. Ecoregions of North Carolina. U.S. Environmental Protection Agency, Corvallis OR.
(map scale 1:1,500,000).
Gross, M. R., and MacMillan,A. M. 1981. Predation and the evolution of colonial nesting in Bluegill
sunfish (Lepomis macrochirus). Behavioral Ecology and Sociobiology 8:167-174.
Hardy,J.D. 1978. Development of fishes of the Mid-Atlantic Bight.An atlas of egg, larval and juveniles
sates, Volume 3. U. S. Fish and Wildlife Services Biological Services ProgramFWS-OBS-78/12.
54

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Jenkins, R.E. and Burkhead, N.M.1994. Freshwater Fishes of Virginia. American Fisheries Society,
Bethesda MD.
Jenkins, R.E., and Burkhead, N.M. 1993. Freshwater Fishes of Virginia. American Fisheries Society,
Bethesda MD.
Jenkins, R. E. 1970. Systematic studies of the catostomid fish tribe Moxostomitini. Doctoral dissertation.
Cornell University, Ithaca NY.
Lachner, E. A., and Wiley, M. L. 1971. Populations of the polytypic species Nocomis leptocephalus
(Girard)with a description of a new subspecies. Smithsonian Contributions to Zoology 92.
Menhinick, E.F. 1991. The Freshwater Fishes of North Carolina. North Carolina Wildlife Resources
Commission, Raleigh, NC.
Meyer,W. H. 1962. Life history of three species of redhorse(Moxostoma) in the Des Moines River, Iowa.
Transactions of the American Fisheries Society 91:412-419.
Miller,T.J., Crowder, L.B., Rice,J.A., Marshall, E.A. 1988. Larval size and recruitment mechanisms in
fishes:toward a conceptual framework. Canadian Journal of Fisheries and Aquatic Sciences
45:1657-1670 p.
North Carolina Department of Environmental Quality(NCDEQ). 2020. Roanoke River Basin Documents.
Accessed February 27, 2020. https://deq.nc.gov/about/divisions/mitigation-services/dms-
planning/watershed-planning-documents/roanoke-river-basin
North Carolina Department of Environmental Quality(NCDEQ) 2018. Roanoke River Basin Restoration
Priorities. October 2009,Amended August 2018. Accessed February 27, 2020.
https://files.nc.gov/ncdeq/Mitigation%20Services/Watershed Planning/Roanoke River Basin/R
oanoke-RBRP-082018.pdf
North Carolina Department of Natural and Cultural Resources (NCDNCR). 2020. North Carolina Natural
Heritage Data Explorer element occurrence data. NCDNCR, Raleigh NC.
https://deq.nc.gov/about/divisions/water-resources/planning/basin-planning/water-resource-
plans/roanoke-2006
Olmsted, L. L., and Cloutman, D. G. 1979. Life history of the Flat Bullhead, Ictalurus platycephalus, in
Lake Norman, North Carolina.Transactions of the American Fisheries Society 108:38-42.
Pflieger,W. L. 1975.The fishes of Missouri. Missouri Department of Conservation, Columbia MO.
Richmond, N.D. 1940. Nesting of the sunfish, (Lepomis auratus(Linnaeus), in tidal waters. Zoologica
(New York) 25:329-331.
Rohde, F. C., Arndt,J. W., Foltz, and Quattro,J. W. 2009. Freshwater Fishes of South Carolina. University
of South Carolina Press, Columbia SC. 430 pp.
Smith, C. G. 1977.The biology of three species of Moxostoma (Pisces: Catostomidae) in Clear Creek,
Hocking and Fairfield counties, Ohio,with emphasis on the Golden Redhorse, M. erythrurum
(Rafinesque). Doctorial dissertation. Ohio State University, Columbus OH.
55

316(b) Compliance Submittal
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Snelson, F. F. 1968. Systematics of the cyprinid fish Notropis ameonus,with comments on the subgenus
Notropis. Copeia 1968:776-802.
Trautman, M. B. 1981. Fishes of Ohio with illustrated keys, revised edition. Ohio State University Press,
Columbus OH.
United States Environmental Protection Agency(USEPA). 2014. National Pollutant Discharge Elimination
System - Final Regulations to Establish Requirements for Cooling Water Intake Structures at
Existing Facilities and Amend Requirement at Phase I Facilities; Final Rule. 40 CFR Parts 122 and
125. Federal Register Vol. 79 No. 158.August 15, 2014.
United States Fish and Wildlife Service (USFWS). 1987, 1988, 2017. Environmental Conservation Online
System (ECOS).Accessed May 3, 2021.
https://ecos.fws.gov/ecp/species/1134#conservati on Pla ns.
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Appendices

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Appendix A. Dan River Combined Cycle Station
§122.21(r)(2) — (8) Submittal Requirement Checklist.
2 i Narrative description and scaled drawings of source Yes
� OO P g
waterbody.
a (2)(ii) Identification and characterization of the source Yes
waterbody's hydrological and geomorphological
ofeatures, as well as the methods used to conduct any
physical studies to determine intake's area of
influence within the waterbody and the results of
v, such studies.
(2)(iii) Locational maps. Yes
:° (3)(i) Narrative description of the configuration of each Yes
CD
o CWIS and where it is located in the waterbody and in
v
3 3 the water column.
c 3 (3)(ii) Latitude and Longitude of CWIS. Yes
°o v, (3)(iii) Narrative description of the operation of each CWIS. Yes
rn (3)(iv) Flow distribution and water balance diagram. Yes
(3)(v) Engineering drawing of CWIS. Yes
(4)(i) A list of the data supplied in paragraphs (r)(4)(ii) Yes, but not
o through (vi)of this section that are not available and applicable
efforts made to identify sources of the data. because all data
is available.
(4)(ii) A list of species (or relevant taxa)for all life stages and Yes
their relative abundance in the vicinity of CWIS.
(4)(iii) Identification of the species and life stages that would Yes
s be most susceptible to impingement and entrainment.
To (4)(iv) Identification and evaluation of the primary period of Yes
no reproduction, larval recruitment, and period of peak
c abundance for relevant taxa.
(4)(v) Data representative of the seasonal and daily Yes
= activities of biological organisms in the vicinity of
CWIS.
m (4)(vi) Identification of all threatened, endangered, and Yes
other protected species that might be susceptible to
impingement and entrainment at cooling water intake
structures.
(4)(vii) Documentation of any public participation or Yes, but not
consultation with Federal or State agencies applicable.
undertaken in development of the plan.
A-1

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
(4)(viii) Methods and QA procedures for any field efforts. Yes, but not
applicable as no
new data have
been collected.
(4)(ix) In the case of the owner or operator of an existing Yes, noted in
facility or new unit at an existing facility,the Source report that (i)
Water Baseline Biological Characterization Data is the through (xii)
information included in (i)through (xii). provide this
information.
(4)(x) Identification of protective measures and stabilization Yes
activities that have been implemented, and a
description of how these measures and activities
affected the baseline water condition in the vicinity of
CWIS.
(4)(xi) List of fragile species as defined at 40 CFR 125.92(m) Yes
at the facility.
(4)(xii) Information submitted to obtain Incidental take Yes, but not
exemption or authorization for its cooling water applicable.
intake structure(s)from the U.S. Fish and Wildlife
Service or the National Marine Fisheries Service.
(5)(i) Narrative description of the operation of the cooling Yes
water system and its relationship to CWIS.
(5)(i) Number of days of the year the cooling water system Yes
is in operation and seasonal changes in the operation
of the system.
(5)(i) Proportion of the design intake flow that is used in the Yes
a system.
(5)(i) Proportion of design intake flow for contact cooling, Yes
non-contact cooling, and process uses.
(5)(i) Distribution of water reuse to include cooling water not applicable
reused as process water, process water reused for
cooling, and the use of gray water for cooling.
OD
(5)(i) Description of reductions in total water withdrawals Yes
c including cooling water intake flow reductions already
achieved through minimized process water
17) withdrawals.
(5)(i) Description of any cooling water that is used in a not applicable
manufacturing process either before or after it is used
for cooling, including other recycled process water
flows.
(5)(i) Proportion of the source waterbody withdrawn (on a Yes
monthly basis).
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316(b)Compliance Submittal
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(5)(ii) Design and engineering calculations prepared by a Yes
qualified professional and supporting data to support
the description required by paragraph (r)(5)(i) of this
section.
(5)(iii) Description of existing impingement and entrainment Yes
technologies or operational measures and a summary
of their performance.
Identification of the chosen compliance method for the entire Yes
CWIS or each CWIS at its facility.
(6)(i) Impingement Technology Performance Optimization No, not selected
Study for Modified Travelling Screen. compliance path
Two years of biological data collection. and thus not
3 applicable.
cu L
• 5
E
o
u
c ` Demonstration of Operation that has been optimized
to minimize impingement mortality.
o Complete description of the modified traveling
w▪ E screens and associated equipment.
2 c (6)(ii) Impingement Technology Performance Optimization
•a Study for Systems of Technologies as BTA for
s E Impingement Mortality.
u —
Cm—
Minimum of two years of biological data measuring
the reduction in impingement mortality achieved by
the system.
(7)(i) Site-specific studies addressing technology efficacy, Yes; note that no
through plant entrainment survival, and other site-specific
impingement and entrainment mortality studies. studies were
E conducted at this
facility.
a a (7)(ii) Studies conducted at other locations including an Yes; note that
✓ explanation of how they relevant and representative. studies at other
E v, locations were
,o not determined
to be relevant.
(7)(iii) Studies older than 10 years must include an not applicable
explanation of why the data are still relevant and
representative.
R (8)(i) Description of individual unit age, utilization for Yes
°—°- E. o ° previous 5 year, major upgrades in last 15 years.
A-3

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
(8)(ii) Descriptions of completed, approved, or scheduled Yes, but not
uprates and Nuclear Regulatory Commission applicable.
relicensing status of each unit at nuclear facilities.
(8)(iii) Other cooling water uses and plans or schedules for Yes, but not
decommissioning or replacing units. applicable.
(8)(iv) For all manufacturing facilities, descriptions of current Yes, but not
and future production schedules. applicable.
(8)(v) Descriptions of plans or schedules for any new units Yes
planned within the next 5 years.
A-4

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Appendix B. Engineering Drawings of Cooling Water
Intake Structure
• Drawing D000830221: Raw Water Intake Screen Downstream Screen
T30"HC-24" PS Intake Screen Assembly w/ 3" ABW Connection
• Drawing DNROC-GA-M-IS.DS.EN-01: Duke Energy Dan River Combined Cycle
Station Raw Water Supply and Wastewater Discharge, Screen and Pump
Station Plan
• Drawing DNROC-PY-M-IS.DS.EV-01: Duke Energy Dan River Combined Cycle
Station Raw Water Supply and Wastewater Discharge, Pump Station and
Screen Elevation
B-1

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
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B-2

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
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B-3

316(b) Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
., 1 1•.
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B-4

Appendix C. Engineering Calculations for Through-
Screen Velocity
c

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Dan River Combined Cycle Station
316(b) Report
Through-Screen Velocity Calculations- Data Sheet
Mike Smallwood (rev 2021-0420)
9,50-0 AI
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44 M T
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O 0.0 O 1) � .2500. Y 2.500 GPM
Msec Maximum Through-Mot Nelociy
2) Designed for 10 ft Depth
1 3) Screen Open Area=63.78%
NOT TO SCALE Total Screen Area=5.044 in'
Source:Johnson Screens,Drawing N 18448-2(2013) Total Screen Open Area=3,500 In2
Screen Data
Screen Open Area =63.78%
Total Screen Area = 5,044 in2
Total Screen Open Area =3,500 in2
Slot Size=3.2mm
Diameter= 30 in
Total Length =91.5 in
Screen Length = 31 in (x2 for each T screen =62 in)
Pump Data
Design Flow/Pump= 2,500 gpm
Design Intake Flow= 5,000 gpm (assumes two pumps running and one spare)
Actual Intake Flow(2016-2020) =2,417 gpm (3.48 MGD)
Screen Source Data:Johnson Screens Drawing 16448-2 (2013)
C-2

316(b)Compliance Submittal
DAN RIVER COMBINED CYCLE STATION
Screen Data
Screen Open Area =63.78%
Total Screen Area = 5,044 in2
Total Screen Open Area =3,500 in2
Slot Size = 3.2mm
Diameter= 30 in
Total Length =91.5 in
Screen Length = 31 in (x2 for each T screen =62 in)
Pump Data
Design Flow/Pump= 2,500 gpm
Design Intake Flow=5,000 gpm (assumes two pumps running and one spare)
Actual Intake Flow (2016-2020) =2,417 gpm (3.48 MGD)
Formulas
1:V=WA
2:A= N*n*D*L*POA
conversion factors
1 gallon =0.1337 ft3
1 minute= 60 seconds
Solve for A Using Formula 2
where:V=through screen velocity,fps Q= pump flow,gpm
A=surface area of screen open mesh,ft2
N = number of wedgewire screen units (3)
D=diameter of wedgewire screen unit,ft
L= length of open mesh area for each screen unit,ft POA= percent open area
A= (3) * (r[) * (2.5) * (5.0) * (0.6378) =75.14 ft2
Solve for TSV at Design Flow Using Formula 1
TSV= [(5000) * (0.1337) * (1/60)]/(75.14)
DIF TSV= 0.15 fps
Solve for TSV at Average Flow Using Formula 1
TSV= [(2417) * (0.1337) * (1/60)]/(75.14)
AIF TSV= 0.07 fps
C-3

Fish Tissue Monitoring of the Dan River
1.1
t y
i,
•
�1. I . .
DAN RIVER COMBINED CYCLE STATION
Eden, North Carolina
NPDES Permit # NC0003468
Duke Energy Environmental Sciences
Huntersville, NC
March 2021
ts
DUKE
ENERGY.

Fish Tissue Monitoring of the Dan River
DAN RIVER COMBINED CYCLE STATION
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 the Dan River during 2017-2020 4
Table 3-2. Means and ranges of trace elements in fish muscle tissue collected from three sampling areas
of the Dan River during 2017, 2019, and 2020. All values are in wet weight (µg/g). 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 the Dan River. 2
Figure 3-1. Box plots of trace element concentrations in fish muscle tissue of sunfish and suckers
collected from three areas in the Dan River during 2017, 2019, and 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
Appendices
Appendix A.Arsenic, selenium, and mercury concentrations (wet weight) in axial muscle of fish from the
Dan River during 2017-2020.

l
Fish Tissue Monitoring of the Dan River
DAN RIVER COMBINED CYCLE STATION
1 Introduction
Duke Energy Carolinas(DEC) owns and operates the Dan River Combined Cycle (DRCC)Station located
on the Dan River in Rockingham County, Eden, North Carolina.The DRCC National Pollutant Discharge
Elimination System (NPDES) Permit (No. NC0003468, Section A. 24.) 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 2017)submitted on August 1, 2017, and the North Carolina Department of Environmental
Quality (NCDEQ) subsequently approved on September 6, 2017.
Target fish were collected from three areas on the Dan River(Figure 1-1)for trace element analysis of
muscle tissue.Area B was located approximately 4.02 km upstream of the plant discharge and served as
a reference area for monitoring background trace element concentrations in fish muscle tissue.Area D
was in the vicinity of the DRCC discharge point and served to monitor potential near-field uptake of
elements in fish muscle tissue.Area E was located approximately 3.22 km downstream of the plant
discharge point 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 the
former Dan River Steam Station (DRSS) (Duke Energy 2019).
1

Fish Tissue Monitoring of the Dan River
DAN RIVER COMBINED CYCLE STATION
..
goo N
5�•�• A
8
\ w
W
s3 h
�s Area E -.,,�
N
• d
Area D
Dan River •
CC Plan o
do• o
S� Low Head Dam
04.
451,
Area B 4
C.:33
t
am
d
M ik 4d'e
Dan Rive ccPI*nt yt- Dan River Trace Element Sampling Areas
i��
DUKE 0 oss 0.5 mi
��ENERGY
NORTH CAROLINA \ 0 0.5 1 2 km
Figure 1-1. Sampling areas for trace element fish tissue monitoring in the Dan River.
2

Fish Tissue Monitoring of the Dan River
DAN RIVER COMBINED CYCLE STATION
2 Methods
2.1 Fish Collection
Fish were collected using boat electrofishing (pulsed DC current). 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 suckers (Moxostoma
spp.)and sunfish (Lepomis spp.). 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 Standard Operating Procedure [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 for possible reanalysis.
3 Results and Discussion
3.1 Fish Collection
During the four years evaluated in this report(2017-2020), a total of 144 individuals from each taxon
were collected.This total included 24 of each taxon from each sampling area in the Dan River(Table 3-
1). Species collected for analysis included Golden Redhorse Moxostoma erythrurum, Notchlip Redhorse
M. collapsum, V-lip Redhorse M. pappillosum, Bluegill Lepomis macrochirus, Redbreast sunfish L.
auritus, and Redear Sunfish L. macrochirus. Fish were collected in relative proportions to their
abundances in the Dan River with respect to the minimum size requirement. Golden Redhorse and
Redbreast Sunfish were the most frequently collected species,although other species were collected
where available (Table 3-1). The sizes of suckers and sunfish collected for analysis were generally similar
across species and sampling areas (Table 3-1). Raw data for fish collected during 2017-2020 and
associated trace element concentrations are presented in Appendix A.
3

Fish Tissue Monitoring of the Dan River
DAN RIVER COMBINED CYCLE STATION
Table 3-1. Numbers and total length ranges(mm) of different species of fish collected for trace element
analyses in the three areas of the Dan River during 2017-2020.
Area B Area D Area E
Number Total length Number Total length Number Total length
range range range
Golden Redhorse 20 295-385 19 253-366 17 269-352
Suckers V-lip Redhorse 0 2 302-327 1 326
(Moxostoma) Notchlip Redhorse 4 319-340 3 327-372 6 325-345
Sunfish Bluegill 0 3 155-171 1 186
(Lepomis) Redbreast Sunfish 24 147-195 18 145-200 19 146-187
Red ear Sunfish 0 3 154-190 4 154-177
3.2 Fish Muscle Tissue Analysis
Fish were collected according to the study plan in all years, however the fish collected in 2018 were not
analyzed for trace element concentrations due to a freezer failure that resulted in spoilage at the
laboratory facility prior to processing.The resulting fish muscle tissue trace element concentrations of
the remaining fish 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 analyzed during 2017-2020 were below the
USEPA screening values for all three trace elements(Table 3-2; Figure 3-1).
Table 3-2.Means and ranges of trace elements in fish muscle tissue collected from three sampling areas
of the Dan River during 2017, 2019, and 2020. All values are in wet weight (µg/g). 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
Area B Suckers 0.10 0.01-0.16 0.41 0.27-0.67 0.15 0.07-0.26
Sunfish 0.10 0.01-0.16 0.52 0.30-0.72 0.07 <0.06-0.17
Area D Suckers 0.11 0.02-0.17 0.43 0.32-0.60 0.16 0.10-0.29
Sunfish 0.10 0.01-0.15 0.51 0.32-0.92 0.08 <0.06-0.14
Area E Suckers 0.10 0.02-0.17 0.43 0.34-0.53 0.18 0.12-0.25
Sunfish 0.09 0.01-0.16 0.50 0.34-0.84 0.07 0.06-0.10
4

Fish Tissue Monitoring of the Dan River
DAN RIVER COMBINED CYCLE STATION
Sunfish Suckers
0.6 0.6
Arsenic II Arsenic
0.5 - 0.5 -
0.4 - 0.4 -
0.3 - 0.3 -
0.2 -
0.2 -
• • • • r
0.1 - 0.1 -.
-B- f •
B D E B D E
1.2 -- 1.2
Selenium Selenium
o) 1.0 - 1.0 -
a) •
•
m 08 - 0.8 -
•
cn' 0.6 T T 0.6 - •
ti T Il
oa •I + oa
cu
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O 0.2 - 0.2 -
U
00 0.0
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0.6 0.6
Mercury Mercury
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0.4 - 0.4 -
' 0.3 - 0.3 - •
• •
0.2 - 0.2 - T T
•
0.1
0 0 0.0 : --
Figure 3-1. Box plots of trace element concentrations in fish muscle tissue of sunfish and suckers
collected from three areas in the Dan River during 2017, 2019, and 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 the Dan River
DAN RIVER COMBINED CYCLE STATION
4 Summary
In accordance with NPDES Permit#NC0003468, 72 sunfish and 72 suckers were collected from the Dan
River during 2017-2020 for analysis of trace elements in muscle tissue. All samples of fish muscle tissue
that were analyzed during this period were below the USEPA screening levels for the three metals
analyzed.Additionally,the concentrations of all three metals in fish muscle tissue were not elevated in
the near field discharge area when compared to the upstream reference. Fish muscle tissue trace
element data collected during 2017-2020 were consistent with data reported previously from the Dan
River(Duke Energy 2019).
5 References
Duke Energy. 2019. Dan River Long-Term Environmental Monitoring Report. Raleigh, NC.
Duke Energy. 2017.Arsenic, Selenium, and Mercury Monitoring in Fish Tissue Study Plan. Dan River
Combined Cycle. NPDES No. NC0003468. 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 the Dan River
DAN RIVER COMBINED CYCLE STATION
Appendices

Fish Tissue Monitoring of the Dan River
DAN RIVER COMBINED CYCLE STATION
Appendix A.
Arsenic, selenium, and mercury concentrations
(wet weight) in axial muscle fish from the Dan River
during 2017-2020.
A-1

Fish Tissue Monitoring of the Dan River
DAN RIVER COMBINED CYCLE STATION
Dry-to-
fresh
Length Weight As Se Hg weight
Fish species Location Sample date (mm) (g) (µg/g) (µg/g) (µg/g) ratio
Golden Redhorse B 1/20/2017 346 386 0.01 0.32 0.13 0.19
Golden Redhorse B 1/20/2017 345 420 0.02 0.33 0.09 0.19
Golden Redhorse B 1/20/2017 343 402 0.02 0.40 0.07 0.19
Golden Redhorse B 1/20/2017 337 391 0.02 0.27 0.07 0.20
Golden Redhorse B 1/20/2017 342 426 0.03 0.46 0.13 0.18
Golden Redhorse B 1/20/2017 347 462 0.03 0.48 0.11 0.20
Redbreast Sunfish B 4/10/2017 170 84 0.01 0.43 0.03 0.19
Redbreast Sunfish B 1/20/2017 172 85 0.01 0.30 0.03 0.19
Redbreast Sunfish B 1/20/2017 180 89 0.00 0.48 0.05 0.18
Redbreast Sunfish B 8/10/2017 174 100 0.01 0.47 0.03 0.20
Redbreast Sunfish B 8/10/2017 173 116 0.01 0.55 0.03 0.19
Redbreast Sunfish B 4/10/2017 184 115 0.01 0.30 0.05 0.20
Golden Redhorse D 4/18/2017 362 480 0.04 0.35 0.12 0.19
Golden Redhorse D 1/26/2017 332 390 0.04 0.35 0.14 0.19
Golden Redhorse D 1/25/2017 349 415 0.03 0.41 0.22 0.19
Golden Redhorse D 1/26/2017 323 370 0.06 0.33 0.14 0.18
Golden Redhorse D 1/27/2017 328 377 0.04 0.34 0.10 0.18
Golden Redhorse D 4/18/2017 366 487 0.02 0.34 0.12 0.17
Redbreast Sunfish D 4/18/2017 185 125 0.01 0.39 0.07 0.19
Redbreast Sunfish D 4/18/2017 182 101 0.01 0.35 0.06 0.17
Redbreast Sunfish D 4/18/2017 181 110 0.01 0.43 0.03 0.19
Redbreast Sunfish D 1/25/2017 176 100 0.01 0.52 0.05 0.18
Redbreast Sunfish 0 1/26/2017 176 96 0.01 0.32 0.04 0.17
Redbreast Sunfish D 4/18/2017 192 136 0.01 0.44 0.08 0.20
Golden Redhorse E 1/25/2017 340 431 0.03 0.43 0.20 0.18
Golden Redhorse E 1/25/2017 341 424 0.03 0.50 0.16 0.21
Golden Redhorse E 1/25/2017 330 390 0.03 0.42 0.20 0.18
Golden Redhorse E 1/25/2017 345 426 0.03 0.47 0.22 0.20
Golden Redhorse E 1/25/2017 330 348 0.02 0.38 0.23 0.18
Golden Redhorse E 4/19/2017 325 378 0.04 0.41 0.13 0.20
Redbreast Sunfish E 4/19/2017 170 103 0.01 0.39 0.07 0.19
Redbreast Sunfish E 4/19/2017 185 114 0.01 0.34 0.06 0.18
Redbreast Sunfish E 4/19/2017 170 104 0.01 0.40 0.05 0.18
Redbreast Sunfish E 4/19/2017 166 100 0.01 0.47 0.04 0.20
Redbreast Sunfish E 1/25/2017 187 122 0.01 0.45 0.06 0.18
Redbreast Sunfish E 4/19/2017 182 117 0.01 0.46 0.05 0.20
A-2

1
Fish Tissue Monitoring of the Dan River
DAN RIVER COMBINED CYCLE STATION
Dry-to-
fresh
Length Weight As Se Hg weight
Fish species Location Sample date (mm) (g) (µg/g) (µg/g) (µg/g) ratio
Golden Redhorsel B 6/26/2018 315 273 - - - -
Golden Redhorsel B 6/26/2018 315 293 - - - -
Golden Redhorsel B 6/26/2018 295 242 - - - -
Golden Redhorsel B 6/26/2018 321 309 - - - -
Golden Redhorsel B 6/26/2018 306 284 - - - -
Golden Redhorsel B 6/26/2018 301 240 - - - -
Redbreast Sunfish' B 6/26/2018 195 136 - - - -
Redbreast Sunfish' B 6/26/2018 162 89 - - - -
Redbreast Sunfish' B 6/26/2018 193 141 - - - -
Redbreast Sunfish' B 6/26/2018 175 114 - - - -
Redbreast Sunfish' B 6/26/2018 186 124 - - - -
Redbreast Sunfish' B 6/26/2018 168 93 - - - -
Golden Redhorse' D 6/25/2018 294 250 - - - -
Golden Redhorse' D 6/25/2018 265 184 - - - -
Golden Redhorse' D 6/25/2018 290 217 - - - -
Golden Redhorse' D 6/25/2018 273 184 - - - -
Golden Redhorse' D 6/25/2018 253 152 - - - -
Golden Redhorse' D 6/25/2018 280 221 - - - -
Redbreast Sunfish' D 6/25/2018 159 87 - - - -
Redbreast Sunfish' D 6/25/2018 153 66 - - - -
Redbreast Sunfish' D 6/25/2018 154 81 - - - -
Bluegill' D 6/25/2018 155 74 - - - -
Bluegill' D 6/25/2018 171 87 - - - -
Redbreast Sunfish' D 6/25/2018 163 79 - - - -
Golden Redhorse' E 6/25/2018 298 250 - - - -
Golden Redhorse' E 6/25/2018 296 248 - - - -
Golden Redhorse' E 6/25/2018 299 276 - - - -
Golden Redhorse' E 6/25/2018 299 268 - - - -
Golden Redhorse' E 6/25/2018 269 208 - - - -
Golden Redhorse' E 6/25/2018 274 202 - - - -
Redear Sunfish' E 6/25/2018 175 86 - - - -
Redear Sunfish' E 6/25/2018 177 92 - - - -
Redbreast Sunfish' E 6/25/2018 176 112 - - - -
Redbreast Sunfish' E 6/25/2018 165 83 - - - -
Redbreast Sunfish' E 6/25/2018 146 61 - - - -
Bluegill' E 6/25/2018 186 131 - - - -
A-3
i

1
Fish Tissue Monitoring of the Dan River
DAN RIVER COMBINED CYCLE STATION
Dry-to-
fresh
1 Length Weight As Se Hg weight
Fish species Location Sample date (mm) (g) (µg/g) (µg/g) (µg/g) ratio
Redbreast Sunfish B 11/19/2019 151 63 0.15 0.55 0.03 0.21
Redbreast Sunfish B 11/19/2019 150 61 0.14 0.72 0.09 0.20
Redbreast Sunfish B 11/19/2019 156 61 0.13 0.55 0.08 0.19
Redbreast Sunfish B 11/19/2019 159 65 0.14 0.57 0.17 0.20
Redbreast Sunfish B 11/19/2019 158 69 0.16 0.65 0.11 0.21
Redbreast Sunfish B 11/19/2019 173 84 0.13 0.46 0.11 0.19
Golden Redhorse B 11/19/2019 343 410 0.15 0.31 0.10 0.20
Golden Redhorse B 11/19/2019 315 288 0.16 0.29 0.13 0.20
Golden Redhorse B 11/19/2019 364 487 0.12 0.27 0.09 0.15
Notchlip Redhorse B 11/19/2019 340 383 0.14 0.67 0.11 0.19
Golden Redhorse B 11/19/2019 356 433 0.14 0.38 0.19 0.19
Notchlip Redhorse B 11/19/2019 319 264 0.13 0.44 0.23 0.17
Golden Redhorse D 6/24/2019 352 327 0.15 0.47 0.16 0.20
V-lip Redhorse D 6/24/2019 327 323 0.16 0.59 0.21 0.20
Golden Redhorse D 6/24/2019 322 325 0.15 0.48 0.19 0.20
Golden Redhorse D 6/24/2019 309 312 0.16 0.37 0.12 0.20
Golden Redhorse D 6/24/2019 287 251 0.17 0.32 0.16 0.20
V-lip Redhorse D 6/24/2019 302 251 0.14 0.60 0.13 0.19
Redbreast Sunfish D 6/24/2019 162 83 0.15 0.48 0.08 0.20
Redear Sunfish D 6/24/2019 190 110 0.15 0.92 0.07 0.20
Redbreast Sunfish D 6/24/2019 145 50 0.13 0.54 0.13 0.18
Bluegill D 6/24/2019 156 71 0.14 0.46 0.07 0.19
Redbreast Sunfish D 6/24/2019 145 56 0.14 0.49 0.13 0.19
Redear Sunfish D 6/24/2019 154 58 0.14 0.62 0.07 0.20
Golden Redhorse E 6/24/2019 352 327 0.14 0.38 0.06 0.18
Golden Redhorse E 6/24/2019 315 299 0.14 0.42 0.10 0.19
Golden Redhorse E 6/24/2019 296 284 0.15 0.44 0.17 0.19
Golden Redhorse E 6/24/2019 324 318 0.14 0.40 0.14 0.19
V-lip Redhorse E 6/24/2019 326 309 0.11 0.53 0.12 0.15
Golden Redhorse E 6/24/2019 269 238 0.14 0.44 0.13 0.19
Redbreast Sunfish E 6/24/2019 165 86 0.14 0.51 0.19 0.19
Redbreast Sunfish E 6/24/2019 169 86 0.13 0.56 0.12 0.19
Redbreast Sunfish E 6/24/2019 155 68 0.14 0.62 0.07 0.19
Redbreast Sunfish E 6/24/2019 177 123 0.14 0.48 0.07 0.20
Redbreast Sunfish E 6/24/2019 176 109 0.14 0.41 0.07 0.19
Redbreast Sunfish E 6/24/2019 151 75 0.14 0.43 0.09 0.20
A-4

Fish Tissue Monitoring of the Dan River
DAN RIVER COMBINED CYCLE STATION
Dry-to-
fresh
Length Weight As Se Hg weight
Fish species Location Sample date (mm) (g) (µg/g) (µg/g) (µg/g) ratio
Golden Redhorse B 6/30/2020 385 556 0.15 0.38 0.19 0.19
Golden Redhorse B 6/30/2020 342 357 0.14 0.43 0.20 0.19
Notchlip Redhorse B 6/30/2020 323 301 0.15 0.50 0.23 0.20
Notchlip Red horse B 6/30/2020 323 329 0.14 0.46 0.21 0.21
Golden Redhorse B 6/30/2020 341 388 0.15 0.46 0.26 0.19
Golden Redhorse B 6/30/2020 370 481 0.15 0.44 0.16 0.20
Redbreast Sunfish B 6/30/2020 171 100 0.14 0.51 0.06 0.20
Redbreast Sunfish B 6/30/2020 172 103 0.15 0.51 <0;06 0.21
Redbreast Sunfish B 6/30/2020 155 71 0.14 0.42 0.06 0.20
Redbreast Sunfish B 6/30/2020 147 63 0.14 0.57 <0.06 0.20
Redbreast Sunfish B 6/30/2020 159 77 0.14 0.68 <0.06 0.20
Redbreast Sunfish B 6/30/2020 164 81 0.14 0.56 <0.06 0.20
Notchlip Redhorse D 6/30/2020 327 304 0.13 0.53 0.17 0.19
Golden Redhorse D 6/30/2020 328 314 0.13 0.41 0.13 0.19
Notchlip Redhorse D 6/30/2020 337 345 0.13 0.46 0.18 0.18
Notchlip Redhorse D 6/30/2020 372 448 0.14 0.57 0.29 0.19
Golden Redhorse D 6/30/2020 314 297 0.15 0.34 0.11 0.20
Golden Redhorse D 6/30/2020 320 296 0.15 0.49 0.18 0.19
Redear Sunfish D 6/30/2020 168 69 0.15 0.60 <0.06 0.20
Redbreast Sunfish D 6/30/2020 170 104 0.15 0.57 0.07 0.21
Redbreast Sunfish D 6/30/2020 200 155 0.15 0.55 0.09 0.20
Redbreast Sunfish D 6/30/2020 179 94 0.13 0.41 0.06 0.19
Redbreast Sunfish D 6/30/2020 152 63 0.13 0.47 0.14 0.18
Redbreast Sunfish D 6/30/2020 152 63 0.15 0.61 <0.06 0.20
Notchlip Redhorse E 10/1/2020 332 364 0.15 0.35 0.19 0.18
Notchlip Redhorse E 10/1/2020 345 363 0.16 0.53 0.20 0.19
Notchlip Redhorse E 10/1/2020 330 350 0.15 0.36 0.18 0.19
Notchlip Redhorse E 10/1/2020 325 354 0.16 0.34 0.25 0.18
Notchlip Redhorse E 10/1/2020 340 343 0.14 0.42 0.19 0.18
Notchlip Redhorse E 10/1/2020 342 344 0.14 0.42 0.19 0.19
Redbreast Sunfish E 10/1/2020 155 59 0.14 0.58 0.10 0.19
Redbreast Sunfish E 10/1/2020 156 66 0.13 0.50 0.08 0.19
Redbreast Sunfish E 10/1/2020 165 69 0.13 0.69 0.10 0.19
Redbreast Sunfish E 10/1/2020 165 71 0.15 0.59 0.10 0.20
Redear Sunfish E 10/1/2020 159 58 0.13 0.36 0.09 0.19
Redear Sunfish E 10/1/2020 154 52 0.16 0.84 0.10 0.20
'Note that fish collected from the Dan River in 2018 were not analyzed due to a freezer failure at the laboratory facility.Freezer
failure led to deterioration of fish tissue,which disqualified such fish for analyses.
A-5