NC0000396_Renewal Application_20230607

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
Richard Brown
Duke Energy Progress LLC
100 E Davie St
Raleigh, NC 27603
Subject: Permit Renewal
Application No. NC0000396
Asheville Steam Electric Power Plant
Buncombe County
Dear Permittee:
NORTH CAROLINA
Environmental Quality
June 07, 2023
The Water Quality Permitting Section acknowledges the June 7, 2023 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 of your renewal application can be found online using the Department of Environmental
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.
ec: WQPS Laserfiche File w/application
Sincerely
Cynthia Demery
Administrative Assistant
Water Quality Permitting Section
North Carolina Department of Environmental Quality I Division of Water Resources
Asheville Regional Office 12090 US. Highway 70 1 Swannanoa, North Carolina 28778
d+� 828.2%.4500

(� DUKE
ENERGY-,
Fed Ex Tracking 772244132490
File 12520A/ENV-30-32
May 31, 2023
RECEIVED
Keith Douthit
Plant General Manager
Asheville Combined Cycle Station
Duke Energy Progress
ASVL PLT 146 Duke Energy Lane
Arden, NC 28704
o: 828-650-0620
f 828-650-0701
[e-mail]
Dr. Sergei Chernikov
NC Division of Water Resources JUN 0 7 2023
1617 Mail Services Center
Raleigh, NC 27699-1617 NCDEQ/DWR/NPDES
Subject: Duke Energy Progress, LLC
Asheville Steam Electric Generating Plant (Asheville Combined Cycle Station)
NPDES Permit No. NC0000396
Buncombe County
Permit Renewal Application
Dear Dr. Chernikov:
Duke Energy Progress, LLC, (Duke) requests the subject permit be renewed and reissued. The above
referenced permit expires on November 30, 2023. As required 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.
The Asheville Plant has undergone numerous updates and transitions from the time the NPDES permit
was renewed and reissued in 2018. The former coal fired plant has been demolished and removed, a new
Combined Cycle Generating station with 2 combustion turbines, 2 steam turbines with direct draft cooling
towers has been constructed and brought online, all ash basins have been excavated and closed out, and
the excavated ash placed into an onsite lined landfill. As other former coal ash facilities, the Groundwater
Corrective Action plan has been submitted to address legacy contamination at the site, and the final task
of dam decommissioning will be complete within the next six (6) months. For this reason, we are
requesting several updates to the existing permit.
Please find enclosed the renewal application package (one original and two copies):
• EPA Form 1
• EPA Form 2C
• Site Map and Compliance Boundary showing the location of all outfalls
• Line Flow chart and treatment technologies
• Supplemental information with Outfall description of sources of pollution and treatment
technologies
• List of Process Chemicals
• Water Quality Instream Monitoring
• 316(b) Report
• Fish Tissue Sampling
• Ash Basin Closure and Corrective Action Plans

Duke Energy Asheville Combined Cycle station
NC0000396 NPDES Renewal Application
Cover letter page 2
With reissuance, Duke requests the following modifications:
• Revise Outfall 001 frequency and parameters
• Revise Outfall 002 frequency and parameters
• Remove Outfalls 001A, 001C
• Remove Outfalls 004 and 005
• Remove Outfall 101
• Remove Instream monitoring and Fish Tissue Sampling
Please see the supplement section at tab 1 for outfall description and details on the requested changes.
Due to seasonality (typically May to October) of Outfall 002, no Form 2C data was able to be collected in
April 2023. Once the seasonal discharge occurs and a representative sample can be collected, an
Addendum with relevant Form 2C data for Outfall 002 will be submitted.
Duke Energy requests notification or acknowledgement that this NPDES permit renewal application is
complete.
Should you have any questions regarding this submittal or require additional information, please contact
Ms. Teresa Williams at [phone] or Mr. Don Safrit at [phone].
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 fines and imprisonment for knowing violations
Sincerely,
Keith Douthit
Plant General Manager
Asheville Combined Cycle Station
Enclosure: Renewal Application Package
cc: Landon Davidson, Asheville Regional Office — NC DEQ DWR Fed Ex 772244195738
Eric Fleet, DWR Water Sciences Section Fed Ex 772252257543
Teresa Williams, Duke Energy —via email
Don Safrit, P.E., Duke Energy - via email

Duke Energy Progress, LLC
Asheville Combined Cycle Station
NPDES Permit #NC0000369
Renewal Application
TABLE OF CONTENTS
1 SUPPLEMENTAL INFORMATION
1.1 Outfall request/descriptions
1.2 List of Process Chemicals
2 EPA FORM 1
2.1 Site Maps
2.2 Continuation sheet
3 EPA FORM 2C
3.1 Section 2 Line drawing
3.2 Section 3 Average Flows and Treatment
3.3 Section 9 Biological Toxicity Test
3.4 Section 10 Contract Analysis
4 INSTREAM MONITORING
5 316B REPORT
6 FISH TISSUE STUDY
7 UPDATED COMPLIANCE BOUNDARY A.(19.)
7.1 ASH BASIN CLOSURE
7.2 CORRECTIVE ACTION PLAN
7.3 SURFACE WATER MONITORING
ii 1 Page

1 SUPPLEMENTAL INFORMATION

SUPPLEMENTAL INFORMATION
1.1 Outfall Request/Descriptions

Asheville Combined Cycle Station
Supplemental Information NC0000396
Asheville Combined Cycle Station
Supplemental Information NC0000396
Introduction and Background
Duke Energy Progress, LLC. is submitting this supplemental information in support of the NPDES permit
renewal package for the Asheville Combined Cycle Station (Plant). This submittal is intended to detail all
the site changes since closure of the 1964 ash basin and demolition of the former coal fired steam plant.
Supplemental information is also provided for the following:
1. A modified process flow to Outfall 001 with removal of the former ash basin
2. A request to reduce toxicity sampling and coal ash related constituents
3. A request to remove internal Outfalls 001A and 001C
4. A request to remove instream monitoring of outfall 001UP and 001DN
5. Discussion of thermal mixing zone study and a request to modify temperature monitoring 001E
6. A request to remove Outfalls 004 and 005
7. A request to remove Outfall 101 due to the ash basin closure
8. A request to clarify and modify requirements at Outfall 002
9. Compliance with CWA Section 316(b)
In total, there will remain two final external outfalls to waters of the State: Outfalls 001 and 002. The
process flows to Outfall 001 have changed and these changes have been documented with the NC DEQ
DWR, NPDES regulatory permitting agency and DEMLR and as described below. There are clarifications
to Outfall 002; specifically, that the outfall does not introduce heat from Evaporative cooling. To facilitate
compliance with the NPDES permit, Form 1 general information & Form 2C tables, flow diagram, maps,
and environmental reports for the renewal package are included in this application package. A review of
other NC Combined Cycle facilities, with former Coal Ash, was conducted during preparation of this
submittal. The most recent station, the Dan River Combined Cycle, NC0003468.
For purposes of this NPDES permit renewal, NC DEQ DWR should be aware that leachate from the lined
coal ash landfill discharges to the Metropolitan Sewerage District of Buncombe County (MSD Buncombe
County) via a Permit to Discharge Treated Groundwater G-038-21. No aspects of the landfill leachate
system discharge to surface waters or associated NPDES permit outfalls.
Likewise, the majority of site industrial stormwater management is address via an individual industrial
stormwater (ISW NPDES Permit No. NCS000575) issued by NC DEQ DEMLR. Outfalls 001 and 002 do
contain industrial stormwater comingled with their discharges. The ISW is currently undergoing
renewal and similar updates to reflect current post -coal site conditions. Thus, the Form 2F is not
included in this application since it is being processed separately.
Please also note the facility address change from 200 CP&L Drive, Arden, NC to 46 Duke Energy Lane,
Arden, NC, 28704

Asheville Combined Cycle Station
Supplemental Information NC0000396
Outfall 001 Previous Condition
At Coal Plant shutdown, the wastewater from the rim ditch process and contact/interstial water in the
1964 basin was treated in the lined rim ditch system, then routed to the lined retention basin, then to
physical chemical treatment and finally decanted to a settling pond outside of the 1964 Ash Basin. The
settling pond serves as the monitoring point for Outfall 001 of the Plant's NPDES permit. Water discharge
from this settling pond is routed directly to the French Broad River through the permitted outfall. Flows
from the new Combined Cycle comingled at the settling pond.
After Coal Plant shutdown, it became apparent the settling pond was oversized for future flows when only
the Combined Cycle station remained. The Combined Cycle did not require additional treatment and the
station began designing a modification to the pond. This modification is to occur in 2023.
Removal of the 1964 Ash Basin and post closure flows
Ash removal in the 1964 Ash Basin began prior to Coal Plant Shutdown and was required by the Mountain
Energy Act to be completely removed by August of 2022. In 2020, an onsite landfill was constructed to
store the remaining coal ash. Leachate from the now closed landfill is discharged to Metropolitan Sewage
District of Buncombe County (MSD).
As ash removal progressed, a modification to discharge flows from the 1964 basin to outfall 101 was made
in 2022. These flows would include surfaced groundwater and non -industrial stormwater once the 1964
dam was breached. As the surfaced groundwater was separated from remaining ash, sampling revealed
that it should be directed and monitoring with outfall 001 (as it currently was being done), rather than be
discharged toward outfall 101. Underdrains were constructed within the 1964 basin with a wet well that
will direct pumping to outfall 001 in the near future. Treatment for pH will be employed as needed. Only
non -industrial stormwater will flow from the former ash basin once stabilization and dam
decommissioning is completed, where outfall 101 currently exists.
Outfall 001— Current/Future state of Combined Cycle Station operation
Outfall 001 will be compromised of approximately 95% Cooling tower blowdown with remaining volumes
coming from 1964 underdrains and stormwater from fuel unloading containments processed through an
oil water separator.
The Combined Cycle process uses raw water from Lake Julian that is put through an ultrafiltration (UF)
process before being stored in the service water tanks. There are internal processes in place to reuse
water within the cooling towers. These are described as follows. The OF backwash is collected in a sump
and then pumped into the cooling tower basin for re -use in the condenser circulating water system. Some
of this water will be present in the cooling tower blowdown. Demineralized water for Heat Recovery
Steam Generator (HRSG) makeup and Combustion Turbine Generator (CTG) operation is put through a
Reverse Osmosis (RO) process, which has a reject flow that is collected in the OF backwash sump and then
pumped into the cooling tower basin. Both the OF and RO share a common clean -in -place (CIP) system.
The chemical solution waste from the CIP system is discharged to the Neutralization tank. Neutralization
waste is discharged in the OF backwash sump and then pumped to the cooling tower basin.

Asheville Combined Cycle Station
Supplemental Information NC0000396
The cooling towers dissipate waste heat through evaporation and the concentration of dissolved solids is
controlled via blowdown to the common wastewater collection sump. The cooling towers will be treated
with dispersant, corrosion inhibitor, and sodium hypochlorite. Each cooling tower utilizes side stream
filters to limit the accumulation of solids in the basin. Cooling tower blowdown, 3% of Circulating Water
System, is treated with sodium bisulfite for residual chlorine removal. HRSG Blowdown is routed to the
cooling tower for re -use in the condenser circulating water system. Cycles of concentration range from 5
to 10, depending on condition, with reuse of plant process as much as possible.
Various plant equipment, including fuel oil storage tanks, transformers, etc., requires containment areas
for spills. Storm water collected in these areas is visually inspected for the presence of oil and is either
released through the storm drains system or routed through the plant drains to an oil water separator.
The discharge from the oil water separators is recycled back into Circulating Water via Side Stream filter
backwash sump.
Domestic wastes are connected to an on -site lift station and pumped into the MSD sewer system
permitted by WQ0039618 — NC DEQ Wastewater (sewer) Extension Permit.
The cooling towers blowdown is sent to a wastewater collection sump where it is then pumped to the
existing manhole #1. Which is located north of the station. Manhole #1 flows to outfall 001 settling pond
where this flow combines with surfaced groundwater from the former 1964 basin.
The settling pond (Outfall 001) is currently undergoing a modification to accommodate the reduction in
flows from the completion of the ash pond decommissioning projects and also account for the lower flows
from the Combined Cycle station.
Requested revisions to Outfall 001 due to removal of Coal Ash
Frequency of sampling be reduced to Monthly.
The following parameters and limits be removed: Mercury, Arsenic, Selenium, Beryllium, Cadmium,
Chromium, Copper, Fluoride, Lead, Nickel, Silver, Zinc, Bromides, TDS, Hardness and Conductivity.
Condition A.8 and Note 4 Chronic Toxicity frequency be reduced to quarterly sampling.
Remove Note 5, 6, and 7 with removal of coal ash discharge.
The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50 NTU.
If the instream turbidity exceeds 50 NTU due to natural background conditions, the discharge cannot cause
turbidity to increase in the receiving stream. Therefore, if the effluent measurement exceeds 50 NTU, the
Permittee shall sample upstream and downstream turbidity in the receiving waterbody, within 24 hours,
to demonstrate the existing turbidity level in the receiving waterbody was not increased. All data shall be
reported on the DMRs. (See 15A NCAC 28.0211 (21)).
The facility shall continuously monitor TSS concentration, and the dewatering pump shall be
shutoff automatically when one-half of the Daily Maximum limit (15 minutes average) is exceeded.

Asheville Combined Cycle Station
Supplemental Information NC0000396
Pumping will be allowed to continue if interruption might result in a dam failure or damage. The
continuous TSS monitoring is only required when the pumps are employed for dewatering.
The facility shall continuously monitor pH and the dewatering pump shall be shutoff automatically
when 15 minutes running average pH falls below 6.1 standard units or rises above 8.9 standard units.
Pumping will be allowed to continue if interruption might result in a dam failure or damage. The
continuous pH monitoring is only required when the pumps are employed for dewatering.
Remove additional notes from Outfall 001 with removal of coal ash discharge:
If any one of these pollutants (As, Se, Hg, Ni, and Pb) reaches 85% of the allowable monthly
average effluent discharge concentration during dewatering, the facility shall immediately discontinue
discharge of the wastewater and report the event to the DWR Asheville Regional Office and DWR Complex
NPDES Permitting via telephone and e-mail.
The rate for lowering the liquid level in a coal ash pond shall not exceed one (1) foot per day unless
a higher rate is supported to the satisfaction of DEMLR and in accordance with NCAC, Title 15A, Subchapter
2K.
By January 31, 2020, there shall be no discharge of pollutants in fly ash transport water. This
requirement only applies to fly ash transport water generated after January 31, 2020.
By January 31, 2020, there shall be no discharge of pollutants in bottom ash transport water. This
requirement only applies to bottom ash transport water generated after January 31, 2020.
The facility shall treat the wastewater discharged from the ash pond using physical -chemical
treatment, if necessary, to assure state Water Quality Standards are not contravened in the receiving
stream. Duke Energy shall notify DWR Complex NPDES Permitting and DWR Asheville Regional Office, in
writing, within seven calendar days of installing additional physical -chemical treatment at this Outfall.
Thermal Mixing Zone Study and Outfall 001E
A thermal mixing zone study was completed for the Asheville Steam Electric Plant for Outfall 001 in 2018
prior to the Combined Cycle coming online. For the duration of the existing permit until this application,
the flows from the combined cycle are combined with ash pond decommissioning contact flows and the
current "combined cycle only" condition is representative of the future.
Based on the elimination of Special Condition A.(12.), Duke requests modification of the current
instream thermal mixing zone NPDES permit for Outfall 001 (Note 8)/Outfall 001E:
The facility shall not exceed the instream water temperature of 29 C at the location
approximately 41 meters downstream of Outfall 001 and at the location approximately 8
meters from Outfall on the tronsect across the river. The facility shall not exceed 2.8 C rise
above the background temperature, the difference will be determined between a t4e-
upstreGP9 location upstream of Outfall 001 i.4and the
downstream location 41 meters downstream of Outfall 001.

Asheville Combined Cycle Station
Supplemental Information NC0000396
These recommended edits may be temporary, as Duke Energy is interested in receiving a temperature
limit established only at the representative point of discharge as a monthly grab sample. There are
safety concerns associated with our current instream monitoring location. We plan to develop a revised
thermal mixing zone model and will submit such results and recommendations soon. Once the revised
mixing zone request is approved by DWR and the Outfall 001 temperature limit and monitoring location
has been set, the condition above may be removed from the permit.
Removal of Internal Outfall 001A and 001C
Flow to outfall 001 is primarily made up of cooling tower blowdown. Therefore, since the two upstream
cooling tower blowdown internal outfalls 001A and 001C are similar and their waste streams will be
monitored at outfall 001, it is requested that these two internal outfalls be removed from the permit.
Part I A. (6) Internal Outfoll 001A — Cooling Tower blowdown and HRSG blowdown
1. Remove since no longer applicable/needed captured at outfall 001
Part IA. (7) Internal Outfall 001C— Cooling Tower blowdown and HRSG blowdown
1. Remove since no longer applicable/needed captured at outfall 001
Removal of Outfall 001 Upstream and 001 Downstream
Remove Condition A. (12.) Instream Monitoring since the site has completely transitioning from a coal-
fired facility to a coal -free combustion turbine site.
Note — The Instream Monitoring Report for the previous review timeframe is included in tab 4.
Removal of Outfall 004 & 005
With shutdown and demolition of the former Coal Plant, internal Outfalls 004 & 005 will no longer be
needed or exist. Please remove the following reference from the permit.
Part I A. (3) Internal Outfall 004 — Chemical Metal Cleaning Treatment System
2. Remove since no longer applicable/needed.
Part I A. (4) Internal Outfall 005 — Treated FGD Wet Scrubber Wastewater
2. Remove since no longer applicable/needed.
Clarifications for Outfall 002
Part I A. (2) Outfall 002 — Evaporator System Discharge — request change name to Evaporative to match
system description.
Request Outfall 002 be modified as follows:
Temperature limit of 44.4 C can be removed.
Since the evaporative cooling system does not generate a heat load to the receiving stream,
Duke Energy requests temperature be removed from the Outfall 002. The process description
should use "Evaporative" as opposed to "Evaporator". The Evaporative Cooling system cools air
entering the inlet filter house. The cooler air in warmer months allows for more complete
combustion within the Combustion Turbine unit. The service water blows down to add fresh
service water based on conductivity. No chemicals or other processes are introduced.

Asheville Combined Cycle Station
Supplemental Information NC0000396
Outfall 002 also combines industrial stormwater at its discharge. This stormwater is not included in the
individual stormwater permit (NCS000575) because it also contains industrial process water.
Remove Total Chromium and Total Copper— Non Detected for entire permitted period.
Remove mixing zone defined as all of Lake Julian — No thermal influence.
(Note: due to seasonality (typically May to October) of Outfall 002, no Form 2C data was able to be
collected in April 2023. Once the seasonal discharge occurs and a representative sample can be collected,
an Addendum with relevant Form 2C data for Outfall 002 will be submitted.)
Removal of Outfall 101
Part I A. (5) Outfall 101— Toe Drain Effluent - Remove since no longer applicable/needed.
With Clean Closure of the 1964 Ash Basin, the process source of pollution has been removed. Legacy
groundwater contamination is address in the Corrective Action Plan, and Surface Water Assessment Plan
in compliance with CAMA rules. Surfaced groundwater within the 1964 basin continues to be pumped
to outfall 001. See tab 7 for Ash Basin Closure documentation.
CWA Section 316(b)
Modify Condition A. (10.) Clean Water Act Section 316(b). The 316(b) submittal is included in tab 5. Once
deemed acceptable by NC DEQ DWR, Duke would appreciate acknowledgement of such via issuance of
the renewed permit with the following (or similar) statement:
Based on evaluation of the 316(b) study reports, the Department concludes that the existing
configuration at Asheville represents BTA for meeting the impingement and entrainment
requirements of the Rule. The permittee shall submit the appropriate study reports with the
renewal application for this permit. The permittee shall comply with the Cooling Water Intake
Structure Rule per 40 CFR 125.95.
Remaining Requested changes to existing permit conditions not addressed above:
Remove Condition A. (9.) Clean Water Act Section 316(a) Thermal Variance since it is no longer needed
for any of the discharges associated with the Asheville Plant.
Remove Condition A. (11) Structural Integrity Inspections of Ash Pond Dam since 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. Breaching of the dam is
underway and will be completed within the next six months. Following such activities, the dam will no
longer be subject to NC DEQ DEMLR oversight since the structure will no longer be considered a dam
and exempt from the Dam Safety Law of 1967.
Remove Condition A. (15) Fish Tissue Monitoring Near Ash Pond Discharge since the site will be
completely transitioning from a coal-fired facility to a coal -free combustion turbine site in the next
several months.
Note — The Fish Tissue Monitoring Report for the previous review timeframe is included as tab 6.

SUPPLEMENTAL INFORMATION
1.2 List of Process Chemicals

Supplemental information
1.2 List of Process Chemicals
Chemical
Average stored
Location
Frequency
Purpose
Quantity
AMMONIUM
24,000 gal.
Ammonia Storage
Nox Emission control
HYDROXIDE 19%
400 gal. (2)
Tanks
As needed
Boiler pH control
PB1 & P62 Turbine
Oxygen scavenger
Building
SULFURIC ACID 93%
400 gal.
ACC Water Treatment
OF cleaning
Building
As needed
SODIUM HYDROXIDE
400 gal.
ACC Water Treatment
pH control
25%
Building
As needed
3D TRASAR 3DT487-
800 gal.
ACC Water Treatment
Inhibitor and dispersant
(Phosphoric Acid)
Building Outside
As needed
NALCO 7408- Sodium
800 gal.
ACC Water Treatment
Dechlorination
Bisulfite
Building
As needed
SODIUM
400 gal.
ACC Water Treatment
Disinfection
HYPOCHLORITE
Building
As needed
12.5%
AFFF - FIRE
1,200 gallons
ACC Fuel Unloading
Emergency Response
SUPPRESSION FOAM
As needed
NALCO BT-3000
800 gallons
Boiler Feed Pump
As needed
Boiler pH control
Building
Eliminox
55 gallons
Auxiliary Boiler
As needed
Oxygen scavenger
Permatreat PC-191 T
400 gallons
ACC Water Treatment
As needed
Anti-scalent for RO
Building
System
Citric Acid 50%
400
ACC Water Treatment
As needed
OF cleaning
Building
Nalco 8158
200
ACC Water Treatment
As needed
coagulant
Building
Cat -floc 8103
2500
ACC Water Treatment
As Needed
coagulant
Building

2 EPA FORM 1

EPA Identification Number
NPDES Permit Number
Facility Name
Form Approved 03/05/19
OMB No. 2040-0004
NC0000396
NC0000396
Asheville Combined Cycle
U.S. Environmental Protection Agency
Form
\=.EPA
Application for NPDES Permit to Discharge Wastewater
NPDES
GENERAL INFORMATION
SECTION•
'D
Applicants Not Required to Submit Form 1
1.1
Is the facility a new or existing publicly owned
1.1.2
Is the facility a new or existing treatment works
1.1.1
treatment works?
treating domestic sewage?
If yes, STOP. Do NOT complete © No
If yes, STOP. Do NOT © No
Form 1. Complete Form 2A.
complete Form 1. Complete
Form 2S.
1.2
Applicants Required to Submit Form 1
.=
1.2.1
Is the facility a concentrated animal feeding
1.2.2
Is the facility an existing manufacturing,
operation or a concentrated aquatic animal
commercial, mining, or silvicultural facility that is
a
production facility?
currently discharging process wastewater?
oYes
4 Complete Form 1 No
Yes 4 Complete Form ❑ No
a
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?
Yes -+ Complete Form 1 No
❑ Yes 4 Complete Form �✓ No
and Form 2D.
1 and Form 2E.
U)
CD
1.2.5
Is the facility a new or existing facility whose
discharge is composed entirely of stormwater
Q
associated with industrial activity or whose
discharge is composed of both stormwater and
non-stormwater?
Yes -* Complete Form 1 No
and Form 2F
unless exempted by
40 CFR
122.26(b)(14)(x) or
SECTION
D.- • • i
Facility Name
2.1
Asheville Combined Cycle Station (formerly known as Asheville Steam Electric Plant)
0
2.2
EPA Identification Number
0
v
0
2.3
Facility Contact
Name (first and last)
Title
Phone number
a
Keith Douthit
GMII Regulated Stations
[phone]
Q
rn
Email address
.E-
[e-mail]
d
2.4
Facility Mailing Address
W
Street or P.O. box
z
46 Duke Energy Ln
City or town
State
ZIP code
Arden
NC
28704
EPA Form 3510-1 (revised 3-19) Page 1

EPA Identification Number
NPDES Permit Number
Facility Name
Form Approved 03/05/19
NC0000396
NC0000396
Asheville Combined Cycle
OMB No, 2040-0004
N
2.5
Facility Location
Street, route number, or other specific identifier
Q 0
46 Duke Energy Ln
rn
0
County name
County code (if known)
Buncombe
E _j
City or town
State ZIP code
z
Arden
NC 28704
9D-ECTION
3. SIC
AND NAICS CODES
Description (optional)
3.1
SIC Code(s)
4911
Electric Services
y
m
0
U
U
U
z
3.2
NAICS Codes)
Description (optional)
-a
221112
Fossil Fuel Electric Power Generation
U
Name of Operator
4.1
Duke Energy Progress, LLC
0
4.2
Is the name you listed in Item 4.1 also the owner?
Cz
0
❑✓ Yes ❑ No
0
w
Z
4.3
Operator Status
R
❑ Public —federal ❑ Public —state ❑ Other public (specify)
o
❑✓ Private ❑ Other (specify)
4.4
Phone Number of Operator
[phone]
4.5
Operator Address
Street or P.O. Box
E
46 Duke Energy Lane
City or town
State
ZIP code
0 U
Arden
NC
28704
a
Q
Email address of operator
0
[e-mail]
SECTION1
5.1
Is the facility located on Indian Land?
J
❑ Yes ❑ No
EPA Form 3510-1 (revised 3-19) Page 2

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0000396 NC0000396 Asheville Combined Cycle OMB No.2040-0004
0
_?ECTION 6. EXISTING ENVIRONMENTAL1
5 6.1 Existing Environmental Permits (check all that apply and print or type the corresponding permit number for each)
Q) ❑ NPDES (discharges to surface ❑ RCRA (hazardous wastes) ❑ UIC (underground injection of
r_ water) fluids)
r NC0000396 NCD000830638
= E
w o ❑✓ PSD (air emissions) ❑ Nonattainment program (CAA) ❑ NESHAPs (CAA)
11-628-22A Asheville -Buncombe AQA
w El Ocean dumping (MPRSA) ❑ Dredge or fill (CWA Section 404) ❑✓ Other (specify)
See Attachment
7.1 Have you attached a topographic map containing all required information to this application? (See instructions for
M specific requirements.)
M
❑✓ Yes ❑ No ❑ CAFO—Not Applicable (See requirements in Form 2B.)
U)
m
c
ca
7
m
w
O
N
7
w
Z
8.1 Describe the nature of your business.
The Asheville Combined Cycle Station is an electric generating facility consisting of two simple cycle combustion
turbines and two combined cycle combustion turbines
9.1 1 Does your facility use cooling water?
L d ❑✓ Yes ❑ No -+ 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
o, w 40 CFR 125, Subparts I and J may have additional application requirements at 40 CFR 122.21(r). Consult with your
'7' NPDES permitting authority to determine what specific information needs to be submitted and when.)
0 -he
V c Lake Julian / French Broad River
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.)
d ❑ Fundamentally different factors (CWA ❑ Water quality related effluent limitations (CWA Section
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
OMB No. 2040-0004
NC0000396
NC0000396
Asheville Combined Cycle Station
SECTION•
1
In Column 1 below, mark the sections of Form 1 that you have completed and are submitting with your application.
11.1
For each section, specify in Column 2 any attachments that you are enclosing to alert the permitting authority. Note
that not all applicants are required to provide attachments.
Column 1
Column 2
❑✓ Section 1: Activities Requiring an NPDES Permit
❑ w/ attachments
❑✓ Section 2: Name, Mailing Address, and Location
❑ w/ attachments
❑✓ Section 3: SIC Codes
❑ wl attachments
❑✓ Section 4: Operator Information
❑ w/ attachments
❑ Section 5: Indian Land
❑ w/ attachments
..
❑✓ Section 6: Existing Environmental Permits
❑✓ w/ attachments
❑✓ Section 7: Map
❑✓ watopographic El w/ additional attachments
mp
co
o
❑✓ Section 8: Nature of Business
❑ w/ attachments
❑✓ Section 9: Cooling Water Intake Structures
❑✓ w/ attachments
❑ Section 10: Variance Requests
❑ w/ attachments
v
c
Mn❑✓
Section 11: Checklist and Certification Statement
❑ w/ attachments
Y
d
11.2
Certification Statement
U
I certify under penalty of law that this document and all attachments were prepared under my direction or supervision
in accordance with a system designed to assure that qualified personnel properly gather and evaluate the
information submitted. Based on my inquiry of the person or persons who manage the system, or those persons
directly responsible for gathering the information, the information submitted is, to the best of my knowledge and
belief, true, accurate, and complete. 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
Keith Douthit
GM II Regulated Stations
Signature
Date signed
EPA Form 3510-1 (revised 3-19) Page 4

EPA Form 1
2.1 Site Map

Outfall 001, Subbasin: 04-03-02
Latitude:35°28'03" Longitude:82°32'W
-receiving Stream: French Broad River, Class B
►utfall 002, Subbasin: 04-03-02
Latitude: 35°28'10" Longitude: 82°32'20"
Receiving Stream: Lake Julian, Class C
Facility
Location
NC0000396 - Asheville Steam Electric Gen. Plant
Buncombe County

x
NPDES OUT:F Rol
1
�41vKo
•
O�
ol
alp
e +
�t
r ,
_► , LEGEND
♦ NPDES OUTFALL LOCATION (APPROXIMATE)
1964ASH BASIN WASTE BOUNDARY
e • 1982 ASH BASIN WASTE BOUNDARY
+ r COMPLIANCE BOUNDARY
DUKE ENERGY PROGRESS PROPERTY LINE
_�'. `- • STREAM AND FLOW DIRECTION (TWT 2016)
HOvr R ' . WETLAND (TWT 2016)
�► ; : r. FORMER FLUE GAS DESULFURIZATION (FGD) WETLANDS
SURFACE WATER FLOW DIRECTION
NOTES:
1. THE DEPICTED STREAMS AND WETLANDS DATA WERE APPROVED BY THE US
ARMY CORPS OF ENGINEERS (USACE) ON MAY 19, 2016 - JURISDICTIONAL
DETERMINATION SAW-2014-00189. TAYLOR WISEMAN AND TAYLOR (TWT)
PERFORMED THE SURVEY OF THE FEATURES.
? 2. ALL BOUNDARIES ARE APPROXIMATE.
+ 3. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY PROGRESS, L-C.
-i;�' �! •b• e, : 4. AERIAL IMAGERY OF THE FORMER 1964 BASIN FROM DUKE ENERGY VIA
r PROPELLER, COLLECTED APRIL 24, 2023. SURROUNDING AERIAL IMAGERY
OBTAINED FROM GOOGLE EARTH PRO, COLLECTED JANUARY 28, 2021.
5. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE
PLANE COORDINATE SYSTEM FIPS 3200 (NAD83).
FIGURE 1
p SITE LAYOUT MAP
ASHEVILLE STEAM ELECTRIC PLANT
i,4 ARDEN, NORTH CAROLINA

EPA Form 1
2.2 Continuation Sheet from section 6.1 Existing Environmental Permits
1. WQ0039618 - NC DEQ Wastewater (sewer) Extension Permit
2. STW2016-00040 - Buncombe County Stormwater Permit
3. USACOE SAW-2007-04111 NW12 - Drought condition French Broad River
withdrawal permit
4. NC DEQ Water Withdrawal Authorizations 0033-0002 and 0033-0016

3 EPA FORM 2C

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0000396 NC0000396 Asheville Combined Cycle Station OMB No. 2040-0004
Form U.S. Environmental Protection Agency
ZC \—/EPA Application for NPDES Permit to Discharge Wastewater
NPDES EXISTING MANUFACTURING, COMMERCIAL, MINING, AND SILVICULTURE OPERATIONS
SECTIO 1. OUTFALL LOCATION
1.1 Provide information on each of the facility's outfalls in the table below.
Outfa
° Nu ber Receiving Water Name Latitude Longitude
0 001 French Broad River 35` 28' 03" 82° 32' 56"
J
W
4! 002 Lake Julian 35' 28' 10 82' 32' 20"
0
0
SECTION
a, 2.1 Have you attached a line drawing to this application that shows the water flow through your facility with a water
3 balance? (See instructions for drawing requirements. See Exhibit 2C-1 at end of instructions for example.)
Cc
o ❑✓ Yes ❑ No
SECTION•
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
Operation Average Flow
Cooling Tower Blowdown 0.677 mgd
CD
E 1964 Basin Under drain System 0.029 mgd
cc
w
mgd
-o
cc
y mgd
3
0 Treatment Units
U-
d Description 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.) b Discharge
Dechlorination 2-E Landfill
Discharge to Surface Water 4-A
EPA Form 3510-2C (Revised 3-19) Page 1

EPA Identification Number
NPDES Permit Number
Facility Name
Form Approved 03/05/19
NC0000396
NC0000396
Asheville Combined Cycle Station
OMB No. 2040-0004
3.1
**Outfall Number** 002
Cont.
Operations Contributing to Flow
Operation Average Flow
Evaporative Cooling Water
0.08 mgd
mgd
mgd
mgd
Treatment
Description
Units
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
Discharge to Surface Water
4-A
NA
c
c
0
U
Y
i
QCi
G
Y
a>
**Outfall Number**
Operations Contributing to Flow
0
Operation Average Flow
U-
mgd
R
a
mgd
mgd
mgd
Treatment
Description
Units
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 Dischar e
3.2
Are you applying for an NPDES permit to operate a privately owned treatment works?
E
❑ Yes ❑✓ No 4 SKIP to Section 4.
n
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
NC0000396 NC0000396 Asheville Combined Cycle Station OMB No.2040-0004
SECTION• 1
4.1 Except for storm runoff, leaks, or spills, are any discharges described in Sections 1 and 3 intermittent or seasonal?
❑✓ Yes ❑ No 4 SKIP to Section 5.
4.2
Provide information
on intermittent or seasonal flows for each applicable outfall.
Attach additional pages, if n cessary.
Freq
uency
Flow
Rate
Outfall
Operation
Duration
Average
Average
Long -Term
Maximum
Number
(list)
Days/Week
Months/Year
Average
Dail
Evaporative Cooling
5-7 days/week
5 months/year
0.080 mgd
0.161 mgd
150 days
y
002
days/week
months/year
mgd
mgd
days
c
LL
days/week
monthslyear
mgd
mgd
days
days/week
monthslyear
mgd
mgd
days
a`>
days/week
monthslyear
mgd
mgd
days
c
days/week
monthslyear
mgd
mgd
days
days/week
monthslyear
mgd
mgd
days
days/week
monthslyear
mgd
mgd
days
days/week months/year mgd mgd days
SECTION••••
• 1
Do any effluent limitation guidelines (ELGs) promulgated by EPA under Section 304 of the CWA apply to your facility?
5.1
❑✓ Yes ❑ No 4 SKIP to Section 6.
y
5.2
Provide the following information on applicable ELGs.
i
ELG Category
ELG Subcategory
Regulatory Citation
w
m
M
Steam Electric
Steam Electric Power Industry
40 CFR 423
cc
Qc2
n
Q
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
22
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
Measure
Number
d
Uf
R
m
C
O
w
t)
7
O
a
EPA Form 3510-2C (Revised 3-19) Page 3

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0000396 NC0000396 Asheville Combined Cycle Station OMB No. 2040-0004
SECTION-• 1
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
Brieflyidentifyeach applicable project in the table below.
a
Affected
Final Compliance Dates
E
Brief Identification and Description of
Outfalls
Source(s) of
c
Project
(list outfall
Discharge
Required
Projected
n
number
E
y
d
"8
W
L
CL
a
you attached sheets describing any additional water pollution control programs (or other environmental projects
Lve
t may affect your discharges) that you now have underway or planned? (optional item)
Yes ❑ No ❑✓ Not applicable
SECTION
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
e
requested and attached the results to this application package?
0
No; a waiver has been requested from my NPDES
✓❑ Yes ❑permitting
authority for all pollutants at all outfalls.
Table B.
Toxic Metals, Cyanide, Total Phenols, and Organic Toxic Pollutants
7.4
Do any of the facility's processes that contribute wastewater fall into one or more of the primary industry categories
listed in Exhibit 2C-3? (See end of instructions for exhibit.)
❑✓ Yes ❑ No 4 SKIP to Item 7.8.
3
7.5
Have you checked "Testing Required" for all toxic metals, cyanide, and total phenols in Section 1 of Table B?
w
✓❑ 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.
Required GC/MS Fraction(s)
Primary Industry Category
Check applicable boxes.
Steam Electric
0 Volatile 121 Acid ❑ Base/Neutral ❑ Pesticide
❑ Volatile ❑ Acid ❑ Base/Neutral ❑ Pesticide
❑ Volatile ❑ Acid ❑ Base/Neutral ❑ Pesticide
EPA Form 3510-2C (Revised 3-19) Page 4

EPA Identification Number
NPDES Permit Number
Facility Name
Form Approved 03/05/19
NC0000396
NC0000396
Asheville Combined Cycle Station
OMB No. 2040-0004
7.7
Have you checked "Testing Required" for all required pollutants in Sections 2 through 5 of Table B for each of the
GC/MS fractions checked in Item 7.6?
❑✓ Yes ❑ No
7.8
Have you checked "Believed Present" or "Believed Absent' for all pollutants listed in Sections 1 through 5 of Table B
where testing is not required?
✓❑ Yes ❑ No
7.9
Have you provided (1) quantitative data for those Section 1, Table B, pollutants for which you have indicated testing is
required or (2) quantitative data or other required information for those Section 1, Table B, pollutants that you have
indicated are "Believed Present' in your discharge?
✓❑ Yes ❑ No
7.10
Does the applicant qualify for a small business exemption under the criteria specified in the instructions?
❑ Yes 4 Note that you qualify at the top of Table B, ❑✓ No
then SKIP to Item 7.12.
=
7.11
Have you provided (1) quantitative data for those Sections 2 through 5, Table B, pollutants for which you have
0
determined testing is required or (2) quantitative data or an explanation for those Sections 2 through 5, Table B,
pollutants you have indicated are "Believed Present' in your discharge?
y
`—'
✓❑ Yes ❑ No
4;
Table C. Certain Conventional and Non -Conventional Pollutants
V3
7.12
Have you indicated whether pollutants are 'Believed Present' or "Believed Absent' for all pollutants listed on Table C
for all outfalls?
U
Y
❑✓ Yes ❑ No
7.13
Have you completed Table C by providing (1) quantitative data for those pollutants that are limited either directly or
indirectly in an ELG and/or (2) quantitative data or an explanation for those pollutants for which you have indicated
`Believed Present'?
❑✓ Yes ❑ No
W
Table D. Certain Hazardous Substances and Asbestos
7.14
Have you indicated whether pollutants are 'Believed Present' or "Believed Absent' for all pollutants listed in Table D for
all outfalls?
✓❑ Yes ❑ No
7.15
Have you completed Table D by (1) describing the reasons the applicable pollutants are expected to be discharged
and (2) by providing quantitative data, if available?
Q Yes ❑ No
Table E. 2,3,7,8-Tetrachlorodibenzo- -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 -+ Complete Table E. ❑ No 4 SKIP to Section 8.
7.17
Have you completed Table E by reporting qualitative data for TCDD?
❑ Yes ❑ No
SECTIONOR
MANUFACTURED TOXICSi
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?
w
❑ Yes ❑✓ No 4 SKIP to Section 9.
! U)
8.2
List the pollutants below.
L
1. 4. 7.
0
m
y
2. 5. 8.
3. 6. 9.
EPA Form 3510-2C (Revised 3-19) Page 5

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0000396 NC0000396 Asheville Combined Cycle Station OMB No. 2040-0004
MCTION 9. BIOLOGICAL• I
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 -+ SKIP to Section 10.
U)
.r
N
9.2
Identify the tests and their
ourposes below.
'
Test(s)
Purpose of Test(s)
Submitted to NPDES
Date Submitted
x
Permitting Authority?
0
See Attachment
✓❑ Yes ❑ No
U
M
O
O
ca
❑ Yes ❑ No
❑ Yes ❑ No
�',ECTION
10. CONTRACT
ANALYSES (40
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
See Attachment
Laboratory address
a
w
U
f0
Y
0
Phone number
Pollutant(s) analyzed
SECTIOND•
• •- • r
11.1
Has the NPDES permitting authority requested additional
information?
❑ Yes
✓❑ No 4 SKIP to Section 12.
0
E
11.2
List the information requested and attach it to this application.
0
c
1. 4.
co
a
0
2. 5.
-a
a
3. 6,
EPA Form 3510-2C (Revised 3-19) Page 6

EPA Identification Number
NPDES Permit Number Facility Name Form Approved 03/05/19
NC0000396
NC0000396 Asheville Combined Cycle Station OMB No.2040-0004
SECTIONI
CERTIFICATION STATEMENT (40
In Column 1 below, mark the sections of Form 2C that you have completed and are submitting with your application.
12.1
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 com lete all sections or provide attachments.
Column 1
Column 2
✓❑ Section 1: Outfall Location
❑✓ wl attachments
❑✓ Section 2: Line Drawing
✓❑ wl line drawing ✓❑ w/ additional attachments
Section 3: Average Flows and
w/ list of each user of
❑✓ w/ attachments ❑ privately owned treatment
Treatment
works
❑✓ Section 4: Intermittent Flows
❑ w/ attachments
❑ Section 5: Production
❑ w/ attachments
w/ optional additional
❑ Section 6: Improvements
❑ wl attachments ❑ sheets describing any
additional pollution control
tans
❑ w/ request for a waiver and ❑ w/ explanation for identical
supporting information outfalls
d
wl small business exemption wl other attachments
❑ ❑
d
request
❑ Section 7: Effluent and Intake
❑✓ w/ Table A ❑✓ wl Table B
=
Characteristics
cc
❑✓ w/ Table C ❑✓ wl Table D
:c
d
wl Table E w/ analytical results as an
❑ ❑
Q
attachment
❑ Section 8: Used or Manufactured
❑ w/attachments
y
Toxics
❑ Section 9: Biological Toxicity
✓❑ w/ attachments
Tests
c�
❑✓ Section 10: Contract Analyses
✓❑ wl attachments
❑ Section 11: Additional Information
❑ w/ attachments
Section 12: Checklist and
❑ w/ attachments
Certification Statement
12.2
Certification Statement
I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in
accordance with a system designed to assure that qualified personnel properly gather and evaluate the information
submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly
responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true,
accurate, and complete. I am aware that there are significant penalties for submitting false information, including the
possibility of fine and imprisonment for knowing violations.
Name (print or type first and last name)
Official title
Keith Douthit
GM II Regulated Stations
Signature
Date signed
EPA Form 3510-2C (Revised 3-19) Page 7

This page intentionally left blank.

EPA Identificatior fiber NPDES Perr amber acility Name
NC0000396 NC0000396 Asheville
7
Waiver
Requested
(if applicable)
Units
(specify)
Effluent
Intake (optional)
Pollutant
Maximum
Dail Y
Discharge
(required)
Maximum
Monthly
Y
Discharge
(if available)
Lon Term
Average Dail
9 Y
Discharge
(if available)
Number of
Analyses
Long Term
Average
Value
Number of
Analyses
❑
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.
1'
Biochemical oxygen demand
(BODS)
❑
Concentration
mg/L
2.0
1
<2.0
1
Mass
lb/Day
11.8
<55
2.
Chemical oxygen demand (COD)
❑
Concentration
mg/L
58
1
<20
1
Mass
lb/Day
342
<550
3.
Total organic carbon (TOC)
O
Concentration
mg/L
21
1
2.3
1
Mass
lb/Day
123.6
63.2
4.
Total suspended solids (TSS)
❑
Concentration
mg/L
<2.5
1
<3.0
1
Mass
lb/Day
<14.7
<82.5
5.
Ammonia (as N)
❑
Concentration
mg/L
<0.10
1
<1.0
1
Mass
lb/Day
<0.59
<27.5
6.
Flow
❑
Rate
mgd
0.706
Est
3.294
Est
Temperature (winter)
❑
°C
°C
21.73
90
7.
Temperature (summer)
❑
°C
°C
25.89
90
pH (minimum)
❑
Standard Units
s.u.
8.02
1
7.33
1
8.
pH (maximum)
0
Standard Units
S.U.
8.58
1

This page intentionally left blank.

EPA Identification N NPDES Pen mber Facility Name
NC0000396 NC0000396 Asheville
I ro 0:1 ;1:[ z191W'ff_'1
Z I exal WYM Z 1
M=77Presence
or Absence
Intake
check one
( )
Effluent
(optional)
7CASNumber,
Testing
Units
Long -Term
Re uired
q
Believed
Believed
(specify)
Maximum
Maximum
Average
Number of
Long-
Term
Number
Present
Absent
Daily
Monthly
Daily
Analyses
Average
of
Discharge
Discharge
Discharge
Value
Analyses
(required)
(if available)
(if available)
❑ Check here if you qualify as a small business per the instructions to Form 2C and, therefore, do not need to submit quantitative data for any of the organic toxic pollutants in Sections 2
through 5 of this table. Note, however, that you must still indicate in the appropriate column of this table if you believe any of the pollutants listed are present in your discharge.
Section 1. Toxic Metals, Cyanide, and Total Phenols
Concentration
ug/L
<2.0
1
<2.0
1
1.1
Antimony, total (7440-36-0)
�
❑
O
Mass
lb/Day
<0.0118
<0.055
Concentration
ug/L
<2.0
1
<2.0
1
1.2
Arsenic, total (7440-38-2)
�
❑
o
Mass
lb/Day
<0.0118
<0.055
1.3
Beryllium, total (7440-41-7)
Concentration
ug/L
<0.40
1
<0.40
1
Mass
lb/Day
<0.00236
<0.011
�
El
1.4
Cadmium, total (7440-43-9)
Concentration
ug/L
<0.50
1
<0.50
1
Mass
lb/Day
<0.00295
<0.0137
O
El�
1.5
Chromium, total (7440-47-3)
Concentration
ug/L
<5.0
1
<5.0
1
Mass
lb/Day
<0.0295
<0.137
O
❑
O
Concentration
ug/L
6.9
1
<5.0
1
1.6
Copper, total (7440-50-8)
❑
D
Mass
lb/Day
0.0407
<0.137
Concentration
ug/L
<1.0
1
<1.0
1
1.7
Lead, total (7439-92-1)
0
❑
0
Mass
lb/Day
<0.00589
<0.0275
1.8
Mercury, total (7439-97-6)
Concentration
ng/L
1.41
1
<0.500
1
Mass
lb/Day
0.00000831
<0.0000137
0
0
�
Concentration
ug/L
<5.0
1
<5.0
1
1.9
Nickel, total (7440-02-0)
�
❑
�
Mass
lb/Day
<0.0295
<0.137
Concentration
ug/L
<5.0
1
<5.0
1
1.10
Selenium, total (7782-49-2)
o
❑
o
Mass
lb/Day
<0.0295
<0.137
1.11
Silver, total (7440-22-4)
Concentration
ug/L
<1.0
1
<1.0
1
Mass
lb/Day
<0.00589
<0.0275
0
❑
�

EPA Identification Nr, NPDES Perr mber Facility Name
NC0000396 NCOOuu3yb Asheville
• •
•
• •
•• r
• rr
Presence or Absence
(check one)
Effluent
Intake
(optional)
Poll utant/Parameter
(and CAS Number, if available)
Testing
Required
Units
(specify)
Believed
Present
Believed
Absent
Maximum
Daily
Discharge
Maximum
Monthly
Discharge
Long -Term
Average
Daily
Discharge
Number of
Analyses
Long-
Term
Average
Value
Number
of
Analyses
(required)
(if available)
(if available)
1.12
Thallium, total (7440-28-0)
❑
❑
❑
Concentration
ug/L
<0.50
1
<0.50
1
Mass
lb/Day
<0.00295
<0.0137
1.13
Zinc, total (7440-66-6)
O
O
❑
Concentration
mg/L
0.20
1
<0.020
1
Mass
lb/Day
1.18
<0.55
1.14
Cyanide, total (57-12-5)
O
❑
O
Concentration
mg/L
<0.010
1
<0.010
1
Mass
lb/Day
<0.0589
<0.275
1.15
Phenols, total
O
O
❑
Concentration
ug/L
200
1
82
1
Mass
lb/Day
1.18
2.25
Section 2. Organic Toxic Pollutants (GC/MS Fraction - Volatile Compounds)
2.1
Acrolein (107-02-8)
❑
El
Concentration
ug/L
<5.0
1
<5.0
1
Mass
lb/Day
<0.0295
<0.137
2.2
Acrylonitrile (107-13-1)
�
❑
�
Concentration
ug/L
<5.0
1
<5.0
1
Mass
lb/Day
<0.0295
<0.137
2.3
Benzene (7143-2)
❑
El
Concentration
ug/L
<1.0
1
<1.0
1
Mass
lb/Day
<0.00589
<0.0275
2.4
Bromoform (75-25-2)
El
El
FA
Concentration
ug/L
<1.0
1
<1.0
1
Mass
lb/Day
<0.00589
<0.0275
2.5
Carbon tetrachloride (56-23-5)
El
ElConcentration
ug/L
<1.0
1
<1.0
1
Mass
lb/Day
<0.00589
<0.0275
2.6
Chlorobenzene (108-90-7)
FA
El
0
Concentration
ug/L
<1.0
1
<1.0
1
Mass
lb/Day
<0.00589
<0.0275
2.7
Chlorodibromomethane
(124-48-1)
0
EI
0
Concentration
ug/L
<1.0
1
<1.0
1
Mass
lb/Day
<0.00589
<0.0275
2.8
Chloroethane (75-00-3)
�
❑
0
Concentration
ug/L
<2.0
1
<2.0
1
Mass
lb/Day
<0.0118
<0.055

EPA Identification Nt NPDES Per imber Facility Name
NC0000396 NC0000396 Asheville
Presence or Absence
(check one)
Effluent
Intake
(optional)
Believed
Present
Pt
Believed
Absent
Maximum
Daily
Discharge
Maximum
Monthly
Discharge
Long -Term
Average
Daily
Discharge
Number of
Analyses
Long-
Term
Average
Value
Number
of
Analyses
Pollutant/Parameter
(and CAS Number, if available)
Testing
Required
Units
(specify)
1 1
(required)
(if available)
(if available)
2.9
2-chloroethylvinyl ether
(110-75-8)
Concentration
ug/L
<5.0
1
<5.0
1
Mass
lb/Day
<0.0295
<0.137
2.10
Chloroform (67-66-3)
�
0
�
Concentration
ug/L
2.5
1
<1.0
1
Mass
lb/Day
0.0147
<0.0275
211
Dichlorobromomethane
(75-27-4)
M
Concentration
ug/L
<1.0
1
<1.0
1
Mass
lb/Day
<0.00589
<0.0275
2.12
1,1-dichloroethane (75-34-3)
0
�
�
Concentration
ug/L
<1.0
1
<1.0
1
Mass
lb/Day
<0.00589
<0.0275
2.13
1,2-dichloroethane (107-06-2)
O
Li
o
Concentration
ug/L
<1.0
1
<1.0
1
Mass
lb/Day
<0.00589
<0.0275
2.14
1,1-dichloroethylene (75-35-4)
Concentration
ug/L
<1.0
1
<1.0
1
Mass
lb/Day
<0.00589
<0.0275
2.15
1,2-dichloropropane (78-87-5)
El
El
0
Concentration
ug/L
<1.0
1
<1.0
1
Mass
lb/Day
<0.00589
<0.0275
2.16
1,3-dichloropropylene
(542-75-6)
Concentration
ug/L
<1.0
1
<1.0
1
Mass
lb/Day
<0.00589
<0.0275
2.17
Ethylbenzene (100-41-4)
�
El�
Concentration
ug/L
<1.0
1
<1.0
1
Mass
lb/Day
<0.00589
<0.0275
2.18
Methyl bromide (74-83-9)
�
�
�
Concentration
ug/L
<2.0
1
<2.0
1
Mass
lb/Day
<0.0118
<0.055
2.19
Methyl chloride (74-87-3)
Concentration
ug/L
<2.0
1
<2.0
1
Mass
lb/Day
<0.0118
<0.055
2.20
Methylene chloride (75-09-2)
t7
El
�
Concentration
ug/L
<1.0
1
<1.0
1
Mass
lb/Day
<0.00589
<0.0275
2 21
1.1,2,2- tetrachloroethane
(79-34-5)
Concentration
ug/L
<1.0
1
<1.0
1
Mass
Ib/Day
<0.00589
<0.0275

EPA Identification M NPDES Perr mber Facility Name
NC0000396 NC0000396 Asheville
• .
•
• . • - •
- •Jill
I' III ip illi��ll�l
• 1
Presence or Absence
Intake
check one
( )
Effluent
(optional)
Pollutant/Parameter
Testing
Units
Long -Term
(and CAS Number, if
Required
(specify)
Maximum
Maximum
Average
Long-
Number
available)
Believed
Believed
Daily
Monthly
Daily
Number of
Term
of
Present
Absent
Analyses
Average
Discharge
Discharge
Discharge
Value
Analyses
(required)
(if available)
(if available)
Tetrachloroethylene
Concentration
ug/L
<1.0
1
<1.0
1
2.22
(127-18-4)
O
❑
6]
Mass
Ib/Day
<0.00589
<0.0275
Concentration
ug/L
<1.0
1
<1.0
1
2.23
Toluene (108-88-3)
p
❑
0
Mass
Ib/Day
<0.00589
<0.0275
1,2-trans-dichloroethylene
Concentration
ug/L
<1.0
1
<1.0
1
2.24
10
0
o
Mass
lb/Day
<0.00589
<0.0275
(156-60-5)
1,1,1-trichloroethane
Concentration
ug/L
<1.0
1
<1.0
1
2.25
o
13
Mass
lb/Day
<0.00589
<0.0275
(71-55-6)
1,1,2-trichloroethane
Concentration
ug/L
<1.0
1
<1.0
1
2.26
❑
10
Mass
Ib/Day
<0.00589
<0.0275
(79-00-5)
Concentration
ug/L
<1.0
1
<1.0
1
2.27
Trichloroethylene (79-01-6)
�
�
0
Mass
Ib/Day
1 <0.00589
<0.0275
Concentration
ug/L
<1.0
1
<1.0
1
2.28
Vinyl chloride (75-01-4)
o
❑
13
Mass
Ib/Day
<0.00589
<0.0275
Section 3. Organic Toxic Pollutants (GC/MS Fraction - Acid Components)
Concentration
ug/L
<1.6
1
<1.6
1
3.1
2-chlorophenol (95-57-8)
o
�
o
Mass
lb/Day
<0.00943
<0.044
2,4-dichlorophenol
Concentration
ug/L
<1.6
1
<1.6
1
3.2
(120-83-2)
17
❑
0
Mass
Ib/Day
<0.00943
<0.044
2,4-dimethylphenol
Concentration
ug/L
<1.6
1
<1.6
1
3.3
(105-67-9)
❑
13
Mass
Ib/Day
<0.00943
<0.044
4,6-dinitro-o-cresol
Concentration
ug/L
<8.0
1
<8.0
1
3.4
(534-52-1)
17
Li
0
Mass
Ib/Day
<0.0471
<0,22
Concentration
ug/L
<8.0
1
<8.0
1
3.5
2,4-dinitrophenol (51-28-5)
p
�
�
Mass
I Ib/Day
1 <0.0471
1
<0.22

EPA Identification N NPDES Perr mber Facility Name
NC0000396 NC0000396 Asheville
Presence or Absence
(check one)
Pollutant/Parameter
Testing
(and CAS Number, if Re uired
available) 4 Believed Believed
Present Absent
3.6
12-nitrophenol
(88-75-5)
37
4-nitrophenol
(100-02-7)
3.8
p-chloro-m-cresol
(59-50-7)
O
3.9
Pentachlorophenol
(87-86-5)
o
Phenol
3.10
0
(108-95-2)
2,4,6-trichlorophenol
3.11
(88-05-2)
❑
Section 4. Organic Toxic Pollutants (GCS
4.1
Acenaphthene
(83-32-9)
❑
4.2
Acenaphthylene
(208-96-8)
❑
4.3
Anthracene (120-12-7)
❑
4.4
Benzidine (92-87-5)
❑
4.5
jl3enzo (a) anthracene
(56-55-3)
❑
4.6
113enzo (a) pyrene
(50-32-8)
❑
Units
(specify)
❑
(Z
Concentration
Mass
❑
O
Concentration
Mass
❑
0
Concentration
Mass
❑
a
Concentration
Mass
❑
U
Concentration
Mass
❑
0
Concentration
Mass
Fraction - Base /Neutral Compounds)
❑
O
Concentration
Mass
❑
0
Concentration
Mass
Concentration
Mass
Concentration
Mass
❑
a
Concentration
Mass
Concentration
Mass
Effluent
Intake
(optional)
Maximum
Daily
Discharge
(required)
Maximum
Monthly
Discharge
(if available)
Long -Term
Average
Daily
Discharge
(if available)
Number of
Analyses
Long-
Term
AverageValue
Number
of
Analyses
ug/L
<3.2
1
<3.2
1
Ib/Day
<0.0189
<0.088
ug/L
<8.0
1
<8.0
1
lb/Day
<0.0471
<0.22
ug/L
<1.6
1
<1.6
1
lb/Day
<0.00943
<0.044
ug/L
<8.0
1
<8.0
1
lb/Day
<0.0471
<0,22
mg/L
<0.0050
1
0.23
1
lb/Day
<0.0295
6.32
ug/L
<1.6
1
<1.6
1
lb/Day
<0.00943
<0.044
ug/L
<1.6
1
<1.6
1
lb/Day
<0.00943
<0.044
ug/L
<1.6
1
<1.6
1
lb/Day
<0.00943
<0.044
ug/L
<1.6
1
<1.6
1
lb/Day
<0.00943
<0.044
ug/L
<8.0
1
<8.0
1
lb/Day
<0.0471
<0.22
ug/L
<1.6
1
<1.6
1
lb/Day
<0.00943
<0.044
ug/L
<1.6
1
<1.6
1
lb/Day
<0.00943
<0.044

EPA Identification N NPDES Pen mber Facility Name
NC0000396 NCOODU39b Asheville
Presence or Absence
Intake
(check one)
Effluent
(optional)
Pollutant/Parameter
Testing
Units
Long -Term
(and CAS Number, if available)
Required
q
(specify)
Maximum
Maximum
Average
Long-
Number
Believed
Believed
Daily
Monthly
Daily
Number of
Term
of
Present
Absent
Analyses
Average
Discharge
Discharge
Discharge
Value
Analyses
(required)
(if available)
(if available)
3,4-benzofluoranthene
Concentration
ug/L
<1.6
1
<1.6
1
4.7
(205-99-2)
El
❑
El
Mass
lb/Day
<0.00943
<0.044
Concentration
ug/L
<1.6
1
<1.6
1
4.8
Benzo (ghi) perylene (191-24-2)
EJ
❑
121
Mass
lb/Day
<0.00943
<0.044
Benzo (k) fluoranthene (207-08-
Concentration
ug/L
<1.6
1
<1.6
1
4.9
9)
❑
❑
Mass
lb/Day
<0.00943
<0.044
Bis (2-chloroethoxy) methane
Concentration
ug/L
<1.6
1
<1.6
1
4.10
(111-91-1)
❑
❑
El
Mass
lb/Day
<0.00943
<0.044
Bis (2-chloroethyl) ether (111-44-
Concentration
ug/L
<1.6
1
<1.6
1
4.11
4)
❑
❑
0
Mass
lb/Day
<0.00943
<0.044
Bis (2-chloroisopropyl) ether (102
Concentration
ug/L
<1.6
1
<1.6
1
4.12
80-1)
❑
❑
121
Mass
lb/Day
<0.00943
<0.044
Bis (2-ethylhexyl) phthalate (117-
Concentration
ug/L
<8.0
1
<8.0
1
4.13
81-7)
❑
❑
Mass
lb/Day
<0.0471
<0.22
4-bromophenyl phenyl ether (101
Concentration
ug/L
<1.6
1
<1.6
1
4.14
55-3)
❑
❑
Mass
lb/Day
<0.00943
<0.044
Concentration
ug/L
<1.6
1
<1.6
1
4.15
Butyl benzyl phthalate (85-68-7)
El
121
Mass
lb/Day
<0.00943
<0.044
4.16
2-chloronaphthalene (91-58-7)
Concentration
ug/L
<1.6
1
<1.6
1
❑
El
FA
Mass
lb/Day
<0.00943
<0.044
4.17
4-chlorophenyl phenyl ether
Concentration
ug/L
<1.6
1
<1.6
1
(7005-72-3)
❑
❑
Mass
lb/Day
<0.00943
<0.044
4.18
Chrysene (218-01-9)
Concentration
ug/L
<1.6
1
<1.6
1
El
❑
121
Mass
lb/Day
<0.00943
<0.044
4.19
Dibenzo (a,h) anthracene (53-70-
Concentration
ug/L
<1.6
1
<1.6
LEE]
3)
El
❑
Cl
Mass
lb/Day
<0.00943
<0.044

EPA Identification N NPDES Pern mber Facility Name
N C0000396 N C0000396 Asheville
OMOMSUMMILIM
Presence or Absence
Intake
check one
( )
Effluent
(optional)
PollutantlParameter
Testing
Units
Long -Term
(and CAS Number, if
Required
q
Believed
Believed
(specify)
Maximum
Maximum
Average
Long-
Number
available)
Daily
Monthly
Daily
Number of
Term
of
Present
Absent
Analyses
Average
Discharge
Discharge
Discharge
Value
Analyses
(required)
(if available)
(if available)
Concentration
ug/L
<1.0
1
<1.0
1
4.20
11,2-dichlorobenzene
(95-50-1)
11
0
El
Mass
lb/Day
<0.00589
<0.0275
1,3-dichlorobenzene
Concentration
ug/L
<1.0
1
<1.0
1
4.21
(541-73-1)
El
0
El
Mass
lb/Day
<0.00589
<0.0275
4.22
1,4-dichlorobenzene
Concentration
ug/L
<1.0
1
<1.0
1
(106-46-7)
E
El
Mass
lb/Day
<0.00589
<0.0275
4.23
13,3-dichlorobenzidine
Concentration
ug/L
<8.0
1
<8.0
1
(91-94-1)
Mass
lb/Day
<0.0471
<0,22
Diethyl phthalate
Concentration
ug/L
<1.6
1
<1.6
1
4.24
(84-66-2)
Mass
lb/Day
<0.00943
<0.044
Dimethyl phthalate
Concentration
ug/L
<1.6
1
<1.6
1
4 25
(131-11-3)
ElMass
lb/Day
<0.00943
<0.044
4.26
Di-n-butyl phthalate
Concentration
ug/L
<1.6
1
<1.6
1
(84-74-2)
El
0
Mass
lb/Day
<0.00943
<0.044
4.27
2,4-dinitrotoluene
Concentration
ug/L
<3.2
1
<3.2
1
(121-14-2)
E
B
Mass
lb/Day
<0.0189
<0.088
2,6-dinitrotoluene
Concentration
ug/L
<3.2
1
<3.2
1
4.28
(606-20-2)
El
Mass
lb/Day
<0.0189
<0.088
4.29
Di-n-octyl phthalate
Concentration
ug/L
<1.6
1
<1.6
1
(117-84-0)
Mass
lb/Day
<0.00943
<0.044
4.30
1,2-Diphenylhydrazine
Concentration
ug/L
<1.6
1
<1.6
1
(as azobenzene) (122-66-7)
E
Mass
lb/Day
<0.00943
<0.044
4.31
Fluoranthene
Concentration
ug/L
<1.6
1
<1.6
1
(206-44-0)
E
El
Mass
lb/Day
<0.00943
<0.044
4.32
Fluorene
Concentration
ug/L
<1.6
1
<1.6
1
(86-73-7)
0
Mass
lb/Day
<0.00943
<0.044

EPA Identification Ni NPDES Pern nber Facility Name
NC0000396 NC0000396 Asheville
Presence or Absence
check one
( )
Effluent
tional)
7Long-
Pollutant/Parameter
Testing
Units
Long -Term
(andtake
CAS Number, if
Required
q
Believed
Believed
(specify)
Maximum
Maximum
Average
Number
available)
Daily
Monthly
Daily
Number of
Term
of
Present
Absent
Analyses
Average
Discharge
Discharge
Discharge
Value
Analyses
(required)
(if available)
(if available)
4.33
Hexachlorobenzene
Concentration
ug/L
<1.6
1
<1.6
1
(118-74-1)
El
❑
L'i
Mass
lb/Day
<0.00943
<0.044
4.34
Hexachlorobutadiene
Concentration
ug/L
<1.6
1
<1.6
1
(87-68-3)
El
L1
E
Mass
lb/Day
<0.00943
<0.044
4.35
Hexachlorocyclopentadiene
Concentration
ug/L
<8.0
1
<8.0
1
(77-47-4)
0
El
B
Mass
lb/Day
<0.0471
<0.22
4.36
Hexachloroethane
Concentration
ug/L
<1.6
1
<1.6
1
(67-72-1)
El
❑
0
Mass
lb/Day
<0.00943
<0.044
Indeno (1,2,3-cd) pyrene
Concentration
ug/L
<1.6
1
<1.6
1
4.37
(193-39-5)
Mass
lb/Day
<0.00943
<0.044
Isophorone
Concentration
ug/L
<1.6
1
<1.6
1
4.38
(78-59-1)
El
El
EdMass
lb/Day
<0.00943
<0.044
Naphthalene
Concentration
ug/L
<1.6
1
<1.6
1
4.39
(91-20-3)
❑
El
E
Mass
lb/Day
<0.00943
<0.044
Nitrobenzene
Concentration
ug/L
<1.6
1
<1.6
1
4.40
(98-95-3)
El
❑
Mass
lb/Day
<0.00943
<0.044
N-nitrosodimethylamine
Concentration
ug/L
<1.6
1
<1.6
1
4.41
(62-75-9)
El
❑
Mass
lb/Day
<0.00943
<0.044
4 42
N-nitrosodi-n-propylamine
Concentration
ug/L
<1.6
1
<1.6
1
(621-64-7)
0
0Mass
lb/Day
<0.00943
<0.044
4.43
N-nitrosodiphenylamine
Concentration
ug/L
<1.6
1
<1.6
1
(86-30-6)
❑
El
o
Mass
lb/Day
<0.00943
<0.044
4.44
lPhenanthrene
Concentration
ug/L
<1.6
1
<1.6
1
(85-01-8)
El
0
U
Mass
lb/Day
<0.00943
<0.044
4.45
Pyrene
ncentration
[Moss
ug/L
<1.6
1
<1.6
1
(129-00-0)
El
El
lb
<0.00943
<0.044

EPA Identification N r NPDES Perr mber Facility Name
NC0000396 NC0000396 Asheville
Presence or Absence
Intake
(check one)
Effluent
(optional)
Pollutant/Parameter
Testing
Units
Long -Term
(and CAS Number, if
Required
q
(specify)
Maximum
Maximum
Average
Long-
Number
available)
Believed
Believed
Daily
Monthly
Daily
Number of
Term
of
Present
Absent
Analyses
Average
Discharge
Discharge
Discharge
Value
Analyses
(required)
(if available)
(if available)
Concentration
ug/L
<1.6
1
<1.6
1
4.46 11,2,4-trichlorobenzene
(120-82-1)
0
0
Mass
lb/Day
<0.00943
<0.044
Aldrin
Concentration
ug/L
<0.040
1
<0.040
1
51
(309-00-2)
El
0
EDMass
lb/Day
<0.000236
<0.0011
a-BHC
Concentration
ug/L
<0.040
1
<0.040
1
5.2
(319-84-6)
El
0
2
Mass
lb/Day
<0.000236
<0.0011
Concentration
ug/L
<0.040
1
<0.040
1
5.3
10-13HC
(319-85-7)
0
0
El
Mass
lb/Day
<0.000236
<0.0011
5.4
y-BHC
Concentration
ug/L
<0.040
1
<0.040
1
(58-89-9)
El
0
El
Mass
lb/Day
<0.000236
<0.0011
6-13HC
Concentration
ug/L
<0.040
1
<0.040
1
5.5
(319-86-8)
El
0
F±1
Mass
lb/Day
<0.000236
<0.0011
Chlordane
Concentration
ug/L
<0.40
1
<0.40
1
5.6
(57-74-9)
1-]
El
El
Mass
lb/Day
<0.00236
<0.011
4,4'-DDT
Concentration
ug/L
<0.040
1
<0.040
1
5.7
(50-29-3)
0
El
E1
Mass
lb/Day
<0.000236
<0.0011
4,4'-DDE
Concentration
ug/L
<0.040
1
<0.040
1
5.8
(72-55-9)
El
0
Mass
lb/Day
<0.000236
<0.0011
4,4'-DDD
Concentration
ug/L
<0.040
1
<0.040
1
5.9
(72-54-8)
Mass
lb/Day
<0.000236
<0.0011
Dieldrin
Concentration
ug/L
<0.040
1
<0.040
1
5.10
(60-57-1)
El
0
Mass
lb/Day
<0.000236
<0.0011
5.11
a-endosulfan
Concentration
ug/L
<0.040
1
<0.040
1
(115-29-7)
0
0
Mass
lb/Day
<0.000236
<0.0011

EPA Identification N r NPDES Perr mber Facility Name
NC0000396 NC000039b Asheville
Pollutant/Parameter
(and CAS Number, if
available)
Testing
Required
q
Presence or Absence
(check one)
Units
(specify)
Effluent
Intake
(optional)
Believed
Present
Believed
Absent
Maximum
Daily
Discharge
(required)
Maximum
Monthly
Discharge
(if available)
Long -Term
Average
Daily
Discharge
(if available)
Number of
Analyses
Long-
Term
Average
Value
Number
of
Analyses
512
R-endosulfan
(115-29-7)
El
El
EI
Concentration
ug/L
<0.040
1
<0.040
1
Mass
lb/Day
<0.000236
<0.0011
5.13
Endosulfan sulfate
(1031-07-8)
Concentration
ug/L
<0.040
1
<0.040
1
Mass
lb/Day
<0.000236
<0.0011
5.14
Endrin
(72-20-8)
El
El
El
Concentration
ug/L
<0.040
1
<0.040
1
Mass
lb/Day
<0.000236
<0.0011
5.15
Endrin aldehyde
(7421-93-4)
El
0
o
Concentration
ug/L
<0.040
1
<0.040
1
Mass
lb/Day
<0.000236
<0.0011
5.16
Heptachlor
(76-44-8)
Concentration
ug/L
<0.040
1
<0.040
1
Mass
lb/Day
<0.000236
<0.0011
5.17
Heptachlor epoxide
(1024-57-3)
Concentration
ug/L
<0.040
1
<0.040
1
Mass
lb/Day
<0.000236
<0.0011
5.18
PCB-1242
(53469-21-9)
El
0
Concentration
ug/L
<0.40
1
<0.40
1
Mass
lb/Day
<0.00236
<0.011
5.19
PCB-1254
(11097-69-1)
El
E
Concentration
ug/L
<0.40
1
<0.40
1
Mass
lb/Day
<0.00236
<0.011
5.20
PCB-1221
(11104-28-2)
El
0
Concentration
ug/L
<0.40
1
<0.40
1
Mass
lb/Day
<0.00236
<0.011
5.21
PCB-1232
(11141-16-5)
El
E
Concentration
ug/L
<0.40
1
<0.40
1
Mass
lb/Day
<0.00236
<0.011
5.22
IPCB-1248
(12672-29-6)
0
E
Concentration
ug/L
<0.40
1
<0.40
1
Mass
lb/Day
<0.00236
<0.011
5.23
IPCB-1260
(11096-82-5)
El
D
Concentration
ug/L
<0.40
1
<0.40
1
Mass
lb/Day
<0.00236
<0.011
5.24
PCB-1016
(12674-11-2)
�
El�
Concentration
ug/L
<0.40
1
<0.40
1
Mass
lb/Day
<0.00236
1
<0.011

EPA Identification N r NPDES Pern tuber Facility Name
NC0000396 NC000039b Asheville
Presence or Absence
Intake
check one
( )
Effluent
(optional)
Pollutant/Parameter
Testing
Units
Long -Term
(and CAS Number, if
Required
q
(specify)
Maximum
Maximum
Average
Long-
Number
available)
Believed Believed
Daily
Monthly
Daily
Number of
Term
of
Present Absent
Analyses
Average
Discharge
Discharge
Discharge
Value
Analyses
(required)
(if available)
(if available)
Concentration
ug/L
<0.40
1
<0.40
1
IToxaphene
5.25 g001-35-2
( )
Mass
lb/Day
<0.00236
<0.011

This page intentionally left blank.

EPA Identification IS �r NPDES Pern mber Facility Name
NC0000396 NC0000396 Asheville
Presence or Absence
Intake
check one
( )
Effluent
(optional)
Pollutant/Parameter
Units
Long -Term
(and CAS Number, if available)
(specify)
Maximum
Maximum
Average
Long-
Number
Believed
Believed
Number of
Term
Present
Absent
Daily
Monthly
Daily
Analyses
Average
of
Discharge
Discharge
Discharge
Value
Analyses
(required)
(if available)
(if available)
❑ Check here if you believe all pollutants on Table C to be present in your discharge from the noted outfall. You need not complete the "Presence or Absence" column of Table C for each pollutant.
❑ Check here if you believe all pollutants on Table C to be absent in your discharge from the noted outfall. You need not complete the "Presence or Absence" column of Table C for each pollutant.
Bromide
Concentration
mg/I
<0.20
1
<2.0
1
1
(24959-67-9)
❑
0
Mass
lb/Day
<1.18
54.9
Chlorine, total
Concentration
mg/L
<0.028
1
2'
residual
Ej
❑
Mass
lb/Day
<0.165
Concentration
AUMI
<25
1
<25
1
3.
Color
o
❑
Mass
lb/Day
NA
NA
Concentration
CFU/100 ml
<2.0
1
1
1
4.
Fecal Coliform
❑
�
Mass
lb/Day
NA
NA
Fluoride
Concentration
mg/L
0.32
1
<0.10
1
5'
(16984-48-8)
o
❑
Mass
lb/Day
1.89
<2.75
Concentration
mg/L
0.45
1
0.062
1
6.
Nitrate -nitrite
41
El
Mass
lb/Day
2.65
1.7
Nitrogen, total
Concentration
mg/L
2.15
1
0.23
1
7
organic (as N)
E1
❑
Mass
lb/Day
12.66
6.32
Concentration
mg/L
<5.0
1
<5.0
1
8.
Oil and Grease
❑
o
Mass
lb/Day
<29.5
<137
Phosphorus (as P),
Concentration
mg/L
4.3
1
<0.050
1
9.
total (7723-14-0)
0
❑
Mass
Ib/Day
25.3
<1.37
Sulfate (as SO4)
Concentration
mg/I
27
1
2.9
1
10.
(14808-79-8)
o
❑
Mass
lb/Day
158.98
79.67
mg/L
<1.0
1
<1.0
1
USulfide
(as S)
(as S)
DConcentration
❑
�
Mass
lb/Day
<5.89
<27.5

EPA Identification P ar NPDES Perrr mber =acility Name
NC0000396 NC0000396 Asheville
Presence or Absence
Intake
check one
( )
Effluent
(optional)
Pollut7ailable
Units
Long -Term
(and C
(specify)
Maximum
Maximum
Average
Long-
Number
Believed
Believed
Daily
Monthly
Daily
Number of
Term
of
Present
Absent
Analyses
Average
Discharge
Discharge
Discharge
Value
Analyses
(required)
(if available)
(if available)
(as
Concentration
mg/L
2.0
1
2.0
1
12.Sulfite
(14265-45o
El
Mass
lb/Day
11.8
55
Concentration
mg/L
<0.1
1
<0.1
1
13.
Surfactants
Ej
0
Mass
lb/Day
<0.59
<2.75
Aluminum, total
Concentration
mg/L
<0.40
1
<0.40
1
14.
(7429-90-5)
❑
[A
Mass
lb/Day
<2.36
<11
Barium, total
Concentration
mg/L
0.10
1
<0.025
1
15.
(7440-39-3)
0
0
Mass
lb/Day
0.589
<0.687
Boron, total
Concentration
mg/L
0.052
1
<0.050
1
16.
(7440-42-8)
o
❑
Mass
lb/Day
0.306
<1.37
Cobalt, total
Concentration
ug/L
<5.0
1
<5.0
1
17
(7440-48-4)
0
D
Mass
lb/Day
<0.0295
<0.137
Iron, total
Concentration
mg/L
0.14
1
<0.10
1
18
(7439-89-6)
111
❑
Mass
lb/Day
0.825
<2.75
Magnesium, total
Concentration
mg/L
15
1
<5.0
1
19
(7439-95-4)
LA
❑
Mass
lb/Day
88.4
<137
Molybdenum, total
Concentration
ug/L
<10
1
<10
1
20
(7439-98-7)
O
El
Mass
lb/Day
1 <0.0589
<0.275
Manganese, total
Concentration
mg/L
0.021
1
0.026
1
21.
(7439-96-5)
0
0
Mass
lb/Day
0.124
0.715
Tin, total
Concentration
mg/L
<0.050
1
<0.050
1
22
(7440-31-5)
❑
0
Mass
lb/Day
<0.295
<1.37
total
Concentration
mg/L
<0.050
1
<0.050
1
23.
ITitanium,
(7440-32-6)
0
Mass
lb/Day
<0.295
<1.37

EPA Identification t er NPDES Perry mber :acility Name
NC0000396 NC0000396 Asheville
•
• 9 • •
• - •
.
• 1 1
Presence or Absence
check one
( )
Effluent
Intake
(optional)
Pollutant/Parameter
Units
Long -Term
(and CAS Number, if
available)
Believed
Present
Believed
Absent
(specify)
Maximum
Daily
Discharge
Maximum
Monthly
Discharge
Average
Daily
Discharge
Number of
Analyses
Long-
Term
Average
Value
Number
of
Analyses
(required)
(if available)
(if available)
24.
Radioactivity
Alpha, total
1-1
n
Concentration
Mass
Beta, total
Concentration
Mass
Radium, total
171
Concentration
Mass
Radium 226, total
t]
Concentration
Mass

This page intentionally left blank.

EPA Identification )er NPDES Perm mber 3cility Name
NC0000396 NC0000396 Asheville
-�•
• iI
Presence or Absence
(check one)
Reason Pollutant Believed Present in Discharge
MS • U,
Available Quantitative Data
(specify units)
Pollutant
Believed
Present
Believed
Absent
1
Asbestos
❑
0
2.
Acetaldehyde
❑
O
3.
Allyl alcohol
❑
0
4•
Allyl chloride
❑
0
5•
Amyl acetate
❑
El
6•
Aniline
❑
0
7.
Benzonitrile
❑
0
8.
Benzyl chloride
❑
0
9•
Butyl acetate
❑
O
10.
Butylamine
❑
0
11.
Captan
❑
0
12.
Carbaryl
❑
0
13.
Carbofuran
❑
171
14.
Carbon disulfide
❑
O
15.
Chlorpyrifos
❑
O
16.
Coumaphos
❑
O
17.
Cresol
❑
0
18.
Crotonaldehyde
❑
19.
Cyclohexane
0
171

EPA Identification ber NPDES Perry mber
acility Name
NC0000396 NC0000396 Asheville
-�•
Pollutant
- •
Presence or Absence
(check one)
Reason Pollutant Believed Present in Discharge
• ��
Available Quantitative Data
(specify units)
Believed
Present
Believed
Absent
20.
2,4-D (2,4-dichlorophenoxyacetic acid)
❑
C1
21.
Diazinon
❑
0
22•
Dicamba
❑
0
23.
1 Dichlobenil
❑
El
24•
Dichlone
❑
o
25.
2,2-dichloropropionic acid
❑
10
26.
Dichlorvos
❑
0
27-
Diethyl amine
❑
Ej
28
Dimethyl amine
❑
o
29.
Dintrobenzene
❑
30.
Diquat
❑
o
31.
Disulfoton
❑
O
32.
Diuron
❑
El
33.
Epichlorohydrin
❑
El
34.
Ethion
❑
EI
35.
Ethylene diamine
❑
EI
36.
Ethylene dibromide
❑
El
37.
Formaldehyde
❑
EI
38.
Furfural
I ❑
o

EPA Identification ber
NC0000396
NPDES Pern, mber
NC0000396
3cility Name
Asheville
- •
• •
Presence or Absence
(check one)
.
Reason Pollutant Believed Present in Discharge
•
Available Quantitative Data
(specify units)
Pollutant
Believed
Present
Believed
Absent
39.
Guthion
❑
N
40.
Isoprene
❑
M
41.
Isopropanolamine
❑
0
42.
Kelthane
❑
0
43.
Kepone
❑
O
44.
Marathion
❑
C]
45.
Mercaptodimethur
❑
O
46-
Methoxychlor
❑
0
47.
Methyl mercaptan
❑
(]
48.
Methyl methacrylate
❑
O
49.
Methyl parathion
❑
121
50.
Mevinphos
❑
O
51.
Mexacarbate
❑
O
52.
Monoethyl amine
❑
FA
53.
Monomethyl amine
❑
El
54.
Naled
❑
O
55.
Naphthenic acid
❑
O
56.
Nitrotoluene
❑
O
57
Parathion
1 ❑
❑

EPA Identification ber NPDES Perm mber icility Name
NC0000396 NC0000396 Asheville
Presence or Absence
(check one)
Reason Pollutant Believed Present in Discharge
Available Quantitative Data
(specify units)
Pollutant
Believed
Present
Believed
Absent
58.
Phenolsulfonate
7
EI
59.
Phosgene
❑
EI
60.
Propargite
❑
El
61.
Propylene oxide
❑
p
62.
Pyrethrins
❑
EI
63.
Quinoline
❑
p
64.
Resorcinol
❑
p
65.
Strontium
❑
p
66.
Strychnine
❑
EI
67.
Styrene
❑
p
68.
214,5-T (2,4,5-
trichlorophenoxyacetic acid)
❑
0
69.
TIDE (tetrachlorodiphenyl ethane)
❑
EI
70
2,4,5-TP [2-(2,4,5-trichlorophenoxy)
propanoic acid]
❑
0
71.
Trichlorofon
❑
O
72.
Triethanolamine
❑
o
73.
Triethylamine
❑
EI
74.
Trimethylamine
❑
EI
75.
Uranium
❑
0
76.
Vanadium
0
0

EPA Identification ber NPDES Perrr mber icility Name
N C0000396 N C0000396 Asheville
Presence or Absence
(check one)
Available Quantitative Data
Pollutant
Reason Pollutant Believed Present in Discharge
Believed Believed
(specify units)
Present Absent
77. Vinyl acetate
i
78. Xylene
❑
EI
79. Xylenol
❑
7
80. Zirconium
❑
I p
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 O. See instructions and 40 CFR 122.21(e)(3).

This page intentionally left blank.

EPA Identification N !r NPDES Perrr 'nber --acility Name
NC0000396 NC0000396 Asheville
OM I
TCDD Presence or Absence
Pollutant Congeners (check one)
Results of Screening Procedure
Used or Believed Believed
Manufactured Present Absent
rM 2,3,7,8-TCDD ❑ 1 ❑ F
' 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 O. See instructions and 40 CFR 122.21(e)(3).

EPA Form 2C
3.1 Section 2 Line drawing

1
I Intake
Lake Structure
Julian
3
Existing Unit 3 and 4
A Simple Cycle
Demineralized Water
Storaoe Tanks
Simple Cycle I
CTG Water
Wash
Transfer Truck
Domestic flows
City of
Asheville
Public
water
Potable
and
Sanitary
Svstems
Public Sewer
System (MSD)
2
Equipment
Drains Sump
Outfall 002
Lanod
ing Simple Cycle to
►mwater Drains Lake
ift station42
Julian
38
Unit 07/08
Water Sup—�
Simple 18
Cycle CTG Demineralized =injectioonx
Water Water Tanks
Injection
I Evaporation
Filter Press
(Shared)
29
19
OF E CTG Wash
Water
19
I Transfer Truck
later Unit 7/8 TB /
rator WTB drains sump
T Oil -Water Unit 5/6 TB
--< Separator drain sump
Settling French Broad River
Basin/
Chanel 41 Outfall 001
Basin
faced
3ter Attachment A — Process Flow Diagram
Duke Energy Progress, LLC
Asheville Combined Cycle Station
Buncombe County, May 2023

EPA Form 2C
3.2 Section 3 Average Flows and Treatment

Duke Energy Progress, Inc.
Asheville Combined Cycle Plant — NPDES Permit Number NC0000396
Form 2C - Item 2.1-A Flow, Sources of Pollution, and Treatment Technologies
Stream
Name
Average Flow
Comments
1
Total Facility Raw Water Supply
3.294 MGD
Lake Julian
2
Raw Water to Unit 05/06
1.647 MGD
Average
3
Raw Water to Unit 07/08
1.647 MGD
Average
4
Raw Water to Ultrafiltration
0.160 MGD
Estimated
5
Cooling Tower Makeup
1.335 MGD
Estimated
6
Cooling Tower Evaporation and Drift
0.921 MGD
Estimated
g
Raw Water to Service Water Tank
0.151 MGD
Estimated
9
Ultrafiltration Reject & Strainer Backwash
0.021 MGD
Estimated
10
Service Water to Users
0.072 MGD
Estimated
11
Condenser Circ Water Quench Water to
Boiler Blowdown Tank
0.006 MGD
Estimated
12
Service Water to Two -Pass Reverse Osmosis
Skids
0.148 MGD
Estimated
13
Reverse Osmosis Permeate to Mixed Bed
Demineralizer
0.108 MGD
Estimated
14
Reverse Osmosis Reject
0.040 MGD
Estimated
15
Demineralized Water System Makeup
0.108 MGD
Estimated
16
Service Water Users to Oil Water Separator
0.072 MGD
Estimated
17
Service Water to Unit 3 & 4 Evaporative
Cooling &Cycle Makeup
0.080 MGD
Estimated Seasonal
18
CTG NOx Injection Water
0.255 MGD
Estimated
19
CTG Wash Water
0.001 MGD
Episodic
20
Boiler Makeup
0.016 MGD
Estimated
21
Boiler Blowdown
0.007 MGD
Estimated
22
Boiler Blowdown Tank Evaporation & Losses
0.003 MGD
Estimated
23
Quenched Boiler Blowdown Sump Flow
0.019 MGD
Estimated
24
Sample Panel Flow
0.009 MGD
Estimated
25
Unit 05/06 Oil Water Separator Flow
0.072 MGD
Estimated

Duke Energy Progress, Inc.
Asheville Combined Cycle Plant— NPDES Permit Number NC0000396
Form 2C - Item 2.1-A Flow, Sources of Pollution, and Treatment Technologies
Stream
Name
Average Flow
Comments
26
Total Facility Wastewater to Plant Discharge
0.677 MGD
Estimated
27
Side -Stream Filter Flow (Circulating water)
2.753 MGD
Estimated
28
Side -Stream Filter Backwash Flow
0.0244 MGD
Estimated
29
Sludge to Transfer Truck
0.009 MGD
Episodic
30
OF Backwash Sump discharge flow
0.050 MGD
Estimated
31
Side -Stream Filtrate (Circ water return)
2.390 MGD
Estimated
32
Unit 07/08/WTB Oil water separator Flow
0.114 MGD
Estimated
34
Filter Press Supernatant
0.001 MGD
Estimated
37
Sludge Filter Press Supernatant
0.001 MGD
Estimated
38
Standby Demin Trailer Flow
0.164 MGD
Estimated
39
Cooling Tower Blowdown ( per unit)
0.338 MGD
Average
40
Post ash basin surfaced groundwater
0.029 MGD
Estimated
41
Outfall 001
0.706 MGD
Estimated
42
Outfall 002
0.080 MGD
Estimated Seasonal

EPA Form 2C
3.3 Section 9 Biological Toxicity Test
Chronic Toxicity testing has been conducted at Outfall 001 monthly since the last
permit renewal issued in November 2018. The table below documents the dates and
results.
OUTFALL 001
Toxicity Testing
eDMR Parameter Code TGP3B THP36
eDMR Parameter Code
TGP3B
THP3B
Parameter
(CERI7DPF)
Chronic
Toxicity
(Pass/Fail)
(CER7DCHV)
Chronic
Toxicity
(ChV)
Parameter
(CERI7DPF)
Chronic
Toxicity
(Pass/Fail)
(CER7DCHV)
Chronic
Toxicity
(ChV)
Unit
pass/fail
%
Unit
pass/fail
%
Sample Freq
Monthly
Monthly
Sample Freq
Monthly
Monthly
12/11/18
>7.2
04/06/21
PASS
01/15/19
>7.2
05/04/21
PASS
02/05/19
>7.2
06/08/21
PASS
03/05/19
>7.2
07/13/21
PASS
04/09/19
PASS
08/10/21
PASS
05/07/19
PASS
09/07/21
PASS
06/04/19
PASS
10/05/21
PASS
07/16/19
PASS
11/09/21
PASS
08/13/19
PASS
12/07/21
PASS
09/03/19
PASS
01/04/22
PASS
10/01/19
PASS
02/01/22
PASS
11/12/19
PASS
03/01/22
PASS
12/10/19
PASS
04/12/22
PASS
01/14/20
PASS
05/03/22
PASS
02/11/20
PASS
06/07/22
PASS
03/10/20
PASS
07/12/22
PASS
04/07/20
PASS
08/02/22
PASS
05/05/20
PASS
09/13/22
PASS
06/09/20
PASS
10/11/22
PASS
07/14/20
PASS
11/01/22
PASS
08/04/20
PASS
12/13/22
PASS
09/08/20
PASS
01/17/23
PASS
10/06/20
11/03/20
PASS
PASS
02/07/23
PASS
03/21/23
PASS
12/01/20
PASS
04/11/23
PASS
01/05/21
PASS
02/02/21
PASS
03/09/21
PASS

EPA Form 2C
3.4 Section 10 Contract Analysis
Certified Labs used by Asheville Plant for NPDES monitoring:
LABORATORY
NC STATE LAB #
Asheville Combined Cycle Station
NC Field Lab #5055
6 Duke Energy Lane
Arden, NC 28704
Pace Analytical Services Asheville
NC Wastewater Certification #40
2225 Riverside Drive
Asheville, NC 28804
Duke Energy Analytical Lab
NC Wastewater Certification #248
13339 Hagers Ferry Road
Huntersville, NC 28078-7929
Environmental Testing Solutions, Inc.
NC Biological Analysis Certification #037
P.O. Box 7565
sheville, NC 28802

4 INSTREAM MONITORING

Instream Monitoring Data 12/2018
INSTREAM OUTFALL 001
through
01002
4/2023
71870
00010
00010
< 2.8°C increase in
background
eDMR Parameter Code
Parameter
Total
Arsenic
Total
Bromide
Temperature
Temp - 001E
Calculated Temp.
Difference
(001-Upstream)
Unit
µjL
mg/L
°C
"C
T
Sample Freq
Monthly
Monthly
Monthly
Monthly
Monthly
Sample ID
Date Collected
Downstream
12/05/18
<0.10
<0.10
7.6
Upstream
12/05/18
<0.10
<0.10
7.8
Downstream
01/08/19
<0.10
<0.10
9.5
Upstream
01/08/19
<0.10
<0.10
9.4
Downstream
02/05/19
<0.10
<0.10
9.2
Upstream
02/05/19
<0.10
<0.10
8.9
Downstream
03/06/19
<0.10
<0.10
7.0
Upstream
03/06/19
<0.10
<0.10
6.5
Downstream
04/02/19
<0.10
<0.10
11.2
Upstream
04/02/19
<0.10
<0.10
10.6
Downstream
05/08/19
0.10
<0.10
18.7
Upstream
05/08/19
<0.10
<0.10
17.6
Downstream
06/12/19
0.17
<0.10
19.7
Upstream
06/12/19
0.15
<0.10
19.0
Downstream
07/14/19
0.27
<0.10
23.8
-
Upstream
07/14/19
0.27
<0.10
22.6
21.7
-0.9
Downstream
08/01/19
0.26
<0.10
22.8
-
Upstream
08/01/19
0.18
<0.10
21.6
22.0
0.4
Downstream
09/12/19
0.21
<0.10
24.8
-
Upstream
09/12/19
0.17
<0.10
22.7
22.0
-0.7
Downstream
10/01/19
0.35
<0.10
21.5
-
Upstream
10/01/19
0.33
<0.10
21.1
Downstream
10/07/19
-
-
18.2
-
Upstream
10/07/19
-
-
18.0
18
0.0
Downstream
11/13/19
0.12
<0.10
6.9
-
Upstream
11/13/19
<0.10
<0.10
7.4
7.4
0.0
Downstream
12/05/19
<0.10
<0.10
5.9
-
Upstream
12/05/19
<0.10
<0.10
5.8
6
0.2
Downstream
01/08/20
<0.10
<0.10
7.5
-
Upstream
01/08/20
<0.10
<0.10
7.1
6.5
-0.6
Downstream
02/03/20
<0.10
<0.10
7.3
-
Upstream
02/03/20
<0.10
<0.10
7.6
7.4
-0.2
Downstream
03/03/20
0.18
<0.10
8.6
-
Upstream
03/03/20
0.32
<0.10
8.8
8.7
-0.1
Downstream
04/01/20
<0.10
<0.10
11
-
Upstream
04/01/20
<0.10
<0.10
11.3
11.3
0.0

Instream Monitoring Data 12/2018
INSTREAM OUTFALL 001
through
01002
4/2023
71870
00010
00010
< 2.8°C increase in
background
eDMR Parameter Code
Parameter
Total
Arsenic
Total
Bromide
Temperature
Temp -001E
Calculated Temp.
Difference
(001-Upstream)
Unit
µg/L
mg/L
T
°C
°C
Sample Freq
Monthly
Monthly
Monthly
Monthly
Monthly
Downstream
05/07/20
<0.10
<0.10
14
-
Upstream
05/07/20
<0.10
<0.10
13.5
13.9
0.4
Downstream
06/08/20
0.19
<0.10
21.5
-
Upstream
06/08/20
0.14
<0.10
20.8
21
0.2
Downstream
07/07/20
0.13
<0.10
22.5
-
Upstream
07/07/20
0.14
<0.10
21.8
21.6
-0.2
Downstream
08/13/20
0.65
<0.10
22.3
-
Upstream
08/13/20
0.40
<0.10
21.7
22
0.3
Downstream
09/01/20
0.12
<0.10
22.1
-
Upstream
09/01/20
0.28
<0.10
21.3
21.5
0.2
Downstream
10/09/20
<0.10
<0.10
15.2
-
Upstream
10/09/20
<0.10
<0.10
15.1
15.1
0.0
Downstream
11/04/20
<0.10
<0.10
10.7
-
Upstream
11/04/20
<0.10
<0.10
10.2
9.5
-0.7
Downstream
12/02/20
<0.10
<0.10
6.1
-
Upstream
12/02/20
<0.10
<0.10
6.3
6.6
0.3
Downstream
01/06/21
<0.10
<0.10
6.5
-
Upstream
01/06/21
<0.10
<0.10
6.2
6.0
-0.2
Downstream
02/02/21
<0.10
<0.10
2.8
-
Upstream
02/02/21
<0.10
<0.10
3.2
3.1
-0.1
Downstream
03/02/21
<1.0
<0.10
9.4
-
Upstream
03/02/21
<1.0
<0.10
9.1
8.9
-0.2
Downstream
04/01/21
<1.0
<0.10
10.5
-
Upstream
04/01/21
<1.0
<0.10
10.5
10.3
-0.2
Downstream
05/05/21
<1.0
<0.10
15.1
-
Upstream
05/05/21
<1.0
<0.10
15
15.2
0.2
Downstream
06/07/21
<1.0
<0.10
22
-
Upstream
06/07/21
<1.0
<0.10
21.7
21.7
0.0
Downstream
07/07/21
<1.0
<0.10
23.4
-
Upstream
07/07/21
<1.0
<0.10
22
22.2
0.2
Downstream
08/04/21
<1.0
<0.10
219
-
Upstream
08/04/21
<1.0
<0.10
20.9
20.9
0.0
Downstream
09/01/21
<1.0
<0.10
20.6
-
Upstream
09/01/21
1 <1.0
I <0.10
20.2
20.8
0.6
Downstream
10/08/21
<1.0
<0.10
17.6
-
Upstream
10/08/21
<1.0
<0.10
17.5
17.5
0.0

Instream Monitoring Data 12/2018 through 4/2023
INSTREAM OUTFALL 001
eDMR Parameter Code
01002
71870
01025
C0034
01040
70295
00900
01049
COMER
01147
00070
01090
00010
00010
< 2.8°C increase in
background
Parameter
Total
Arsenic
Total
Bromide
Dissolved
Cadmium
Total
Chromium
Dissolved
Copper
TDS
Total Hardness
as (CaC031
Dissolved
Lead
Field Blank
Mercury
Total Mercury
Total
Selenium
Turbidity
Dissolved
Zinc
Temperature
Temp -001E
Calculated Temp.
Difference
(001-Upstream)
Unit
µg/L
mg/L
µg/L
µg/L
µg/L
mg/L
mg/L
µg/L
ng/L
ng/L
µg/L
NTU
µg/L
°C
°C
°C
Sample Freq
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Downstream
11/04/21
<1.0
<0.10
<0.20
<1.0
<2.0
47.0
9.96
<1.0
<0.50
2.13
<2.0
1.9
<10.0
9.6
-
Upstream
11/04/21
<1.0
<0.10
<0.20
<1.0
<2.0
33.0
10.00
<1.0
<0.50
1.06
<2.0
2.0
<10.0
9.6
9.5
-0.1
Downstream
12/01/21
<1.0
<0.10
<0.20
<1.0
<2.0
30.0
9.92
<1.0
<0.50
<0.50
<2.0
1.5
<10.0
4.1
-
Upstream
12/01/21
<1.0
<0.10
<0.20
<1.0
<2.0
33.0
10.50
<1.0
<0.50
<0.50
<2.0
1.9
<10.0
4.2
4.6
0.4
Downstream
01/05/22
<1.0
<0.10
<0.20
<1.0
<2.0
33.0
10.00
<1.0
<0.50
1.96
<2.0
6.6
<10.0
7.6
-
Upstream
01/05/22
<1.0
<0.10
<0.20
<1.0
<2.0
40.0
9.91
<1.0
<0.50
1.92
<2.0
7.2
<10.0
7.2
6.6
-0.6
Downstream
02/03/22
<1.0
<0.10
<0.20
1.3
<2.0
49.0
11.50
<1.0
<0.50
1.26
<2.0
8.8
<10.0
4.2
-
Upstream
02/03/22
<1.0
<0.10
<0.20
<1.0
<2.0
42.0
10.90
<1.0
<0.50
0.999
<2.0
3.7
<10.0
3.9
4
0.1
Downstream
03/02/22
<1.0
<0.10
<0.20
<1.0
<2.0
35.0
9.70
<1.0
<0.50
1.10
<2.0
6.7
<10.0
9.2
-
Upstream
03/02/22
<1.0
<0.10
<0.20
<1.0
<2.0
36.0
9.75
<1.0
<0.50
1.08
<2.0
4.4
<10.0
7.6
7.8
0.2
Downstream
04/04/22
<1.0
<0.10
<0.20
<1.0
<2.0
31.0
8.15
<1.0
<0.50
1.78
<2.0
7.5
<10.0
12.3
Upstream
04/04/22
<1.0
<0.10
<0.20
<1.0
<2.0
<25.0
8.14
<1.0
<0.50
1.28
<2.0
5.4
<10.0
11.8
12.3
0.5
Downstream
05/05/22
<1.0
<0.10
<0.20
<1.0
<2.0
<25.0
8.84
<1.0
<0.50
1.11
<2.0
3.6
<10.0
20.0
Upstream
05/05/22
<1.0
<0.10
<0.20
<1.0
<2.0
<25.0
9.35
<1.0
<0.50
0.986
<2.0
6.6
<10.0
18.4
18.5
0.1
Downstream
06/06/22
<1.0
<0.10
<0.20
2.6
<2.0
25.0
8.34
<1.0
<0.50
3.19
<2.0
9.8
<10.0
20.3
Upstream
06/06/22
<1.0
<0.10
<0.20
2.6
<2.0
26.0
8.38
<1.0
<0.50
3.10
<2.0
8.8
<10.0
19.2
19
-0.2
Downstream
07/11/22
<1.0
<0.10
<0.20
1.4
<2.0
40.0
9.95
<1.0
<0.50
8.30
<2.0
47.4
<10.0
20.5
Upstream
07/11/22
<1.0
<0.10
<0.20
1.1
<2.0
<25.0
9.46
<1.0
<0.50
4.68
<2.0
34.7
<10.0
20.4
20.4
0.0
Downstream
08/03/22
<1.0
<0.10
<0.20
<1.0
<2.0
30.0
10.60
<1.0
<0.50
3.06
<2.0
17
<10.0
22
Upstream
08/03/22
<1.0
<0.10
<0.20
<1.0
<2.0
<25.0
9.42
<1.0
<0.50
3.52
<2.0
16
<10.0
21.8
21.8
0.0
Downstream
09/07/22
<1.0
<0.10
<0.20
1.6
<2.0
26.0
9.66
<1.0
0.917
8.70
<2.0
31
<10.0
21.3
Upstream
09/07/22
<1.0
<0.10
<0.20
1.3
<2.0
25.0
9.38
<1.0
<0.50
7.61
<2.0
28
<10.0
21
21.2
0.2
Downstream
10/04/22
<1.0
<0.10
<0.20
<1.0
<2.0
44.0
9.70
<1.0
<0.50
1.10
<2.0
5.1
<10.0
1 15.8
Upstream
10/04/22
<1.0
<0.10
<0.20
<1.0
<2.0
35.0
10.40
<1.0
<0.50
1.11
<2.0
3.2
<10.0
14.3
13.7
-0.6
Downstream
11/01/22
<1.0
<0.10
<0.20
<1.0
4.3
33.0
10.10
<1.0
<0.50
1.60
<4.0
5.6
<10.0
13.3
Upstream
11/01/22
<1.0
<0.10
<0.20
<1.0
<2.0
33.0
10.30
<1.0
<0.50
1.68
<4.0
5.6
<10.0
12
12
0.0
Downstream
12/07/22
<1.0
<0.10
<0.20
<1.0
2.6
27.0
11.00
<1.0
<0.50
2.83
<2.0
19
<10.0
10
Upstream
12/07/22
<1.0
<0.10
<0.20
<1.0
3.3
<25.0
10.60
<1.0
<0.50
2.36
<2.0
13
<10.0
10
9.8
-0.2
Downstream
01/04/23
<1.0
<0.10
<0.20
2.6
<2.0
46.0
13.50
<1.0
<0.50
7.18
<2.0
92
<10.0
10.5
Upstream
01/04/23
<1.0
<0.10
<0.20
<1.0
<2.0
37.0
11.80
<1.0
<0.50
5.42
<2.0
35
<10.0
10.4
10.6
0.2
Downstream
02/07/23
<1.0
<0.10
<0.20
<1.0
<2.0
30.0
9.58
<1.0
<0.50
1.46
<2.0
4.2
<10.0
6.0
Upstream
02/07/23
<1.0
<0.10
<0.20
<1.0
<2.0
31.0
9.48
<1.0
<0.50
3.51
<2.0
4.1
<10.0
5.7
5.8
0.1
Downstream
03/01/23
<1.0
<0.10
<0.20
<1.0
<2.0
<25.0
8.63
<1.0
0.916
2.82
<2.0
6.4
<10.0
11.3
11.5
0.2
Upstream
03/01/23
<1.0
<0.10
<0.20
<1.0
<2.0
<25.0
8.69
<1.0
<0.50
2.38
<2.0
5.1
<10.0
11.2
Downstream
04/04/23
<1.0
<0.10
<0.20
<1.0
<2.0
<25.0
20.7
<1.0
<0.50
1.81
<2.0
5.1
<10.0
11.2
11
-0.2
Upstream
04/04/23
<1.0
<0.10
<0.20
<1.0
<2.0
<25.0
9.48
<1.0
<0.50
2.92
<2.0
3.5
<10.0
10.9

5 316B REPORT

Clean Water Act § 316(b)
Compliance Submittal Requirements
Asheville Combined Cycle Station
Arden, NC
NPDES Permit NC0000396
Duke Energy I Environmental Operations
526 South Church Street
Charlotte NC 28202
May 2023
DUKE
*4.1' ENERGY-

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
Contents
ExecutiveSummary ....................................................................................................................................... 7
1 Introduction......................................................................................................................................10
2 Source
Water Physical Data [§122.21(r)(2)].....................................................................................14
2.1
Description of Source Waterbody[§122.21(r)(2)(i)]..............................................................................14
2.2
Characterization of Source Waterbody[§122.21(r)(2)(ii)].....................................................................19
2.3
Locational Maps [§122.21(r)(2)(iii)].......................................................................................................21
3 Cooling Water Intake Structure Data [§ 122.21(r)(3)]......................................................................
22
3.1
Description of CWIS Configuration [§122.21(r)(3)(i)]............................................................................22
3.2
Latitude and Longitude of CWIS§122.21(r)(3)(ii)]................................................................................25
3.3
Description of CWIS Operation [§122.21(r)(3)(iii)]................................................................................25
3.4
Description of Intake Flows and Water Balance [§122.21(r)(3)(iv)]......................................................27
3.5
Engineering Drawings of CWIS [§122.21(r)(3)(v)]..................................................................................27
4 Source Water Baseline Biological Characterization Data[§122.21(r)(4)].........................................28
4.1
List of Available Biological Data [§122.21(r)(4)(i)].................................................................................29
4.2
List of Species and Relative Abundance in the vicinity of CWIS[§122.21(r)(4)(ii)]................................29
4.3
Identification of Species and Life Stages Susceptible to Impingement and Entrainment
[§122.21(r)(4)(iii)]..................................................................................................................................32
4.4
Identification and Evaluation of Primary Growth Period [§122.21(r)(4)(iv)].........................................37
4.5
Data Representative of Seasonal and Daily Activities of Organisms in the Vicinity of CWIS
[§122.21(r)(4)(v)]...................................................................................................................................39
4.6
Identification of Threatened, Endangered, and Other Protected Species Susceptible to
Impingement and Entrainment at CWIS [§122.21(r)(4)(vi)]..................................................................41
4.7
Documentation of Consultation with Services[§122.21(r)(4)(vii)]........................................................43
4.8
Methods and QA Procedures for Field Efforts [§122.21(r)(4)(viii)].......................................................4
4.9
Definition of Source Water Baseline Biological Characterization Data[§122.21(r)(4)(ix)]....................43
4.10
Identification of Protective Measures and Stabilization Activities [§122.21(r)(4)(x)] ...........................43
4.11
List of Fragile Species [§122.21(r)(4)(xi)]...............................................................................................43
4.12
Information Submitted to Obtain Incidental Take Exemption or Authorization from Services
[§122.21(r)(4)(xii)]..................................................................................................................................45
5 Cooling
Water System Data[§122.21(r)(5)]......................................................................................
46
5.1
Description of Cooling Water System Operation [§122.21(r)(5)(i)].......................................................46
5.2
Design and Engineering Calculations [§122.21(r)(5)(ii)]........................................................................52
5.3
Description of Existing Impingement and Entrainment Reduction Measures [§122.21(r)(5)(iii)] .........53
6 Chosen Method(s) of Compliance with Impingement Mortality Standard [§122.21(r)(6)]..............
55
6.1
Design TSV.............................................................................................................................................56
6.2
Requirements of Make-up Water Minimization for Closed -Cycle Recirculating System.......................56
7 Entrainment
Performance Studies [40 CFR § 122.21(r)(7)]..............................................................
58
7.1
Site -Specific Studies [40 CFR §122.21(r)(7)(i)].......................................................................................58
7.2
Studies Conducted at Other Locations [40 CFR§122.21(r)(7)(ii)]..........................................................58

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
8 Operational Status [§ 122.21(r)(8)]...................................................................................................59
8.1 Description of Operating Status [§ 122.21(r)(8)(i)]................................................................................59
8.2 Major Upgrades in Last Fifteen Years....................................................................................................60
8.3 Descriptions of Consultation with Nuclear Regulatory Commission [§122.21(r)(8)(ii)] ........................60
8.4 Other Cooling Water Uses for Process Units[§122.21(r)(8)(iii)]............................................................61
8.5 Description of Current and Future Production Schedules [§122.21(r)(8)(iv)].......................................61
8.6 Description of Plans or Schedules for New Units Planned within 5 years [§122.21(r)(8)(v)] ................61
9 References.........................................................................................................................................62
Appendices.................................................................................................................................................. 66

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
Tables
Table 1-1. Facility and Flow Attributes and Permit Application Requirements....................................................11
Table 1-2. Summary of §316(b) Rule for Existing Facilities Submittal Requirements..........................................13
Table 2-1. Annual Mean Concentration for Select Parameters Documented in Surface Water Samples ............
18
Table 2-2. Summary of Input Parameters for TSV Calculations of CWIS on Lake Julian.......................................20
Table 3-1. Original and Repurposed Cooling Water Intake Structure Components.............................................23
Table 3-2. Cooling Water Intake Structure Coordinate Information...................................................................25
Table 3-3. Number of Hours of Unit 05/06 Cooing System Operation at ACC in 2020-2022..............................26
Table 3-4. Number of Hours of Unit 07/08 Cooling System Operation at ACC in 2020-2022 .............................26
Table 3-5. Monthly Withdrawals (MG) from ACC Intake during 2020-2022 to Support Plant Operations ..........
27
Table 3-6. List of Engineering Drawings for ACC Intakes......................................................................................27
Table 4-1. Relative Abundance of Fish Collected in Electrofishing Samples on Lake Julian.................................31
Table 4-2. Entrainment Potential for Fish Species Identified in Lake Julian.........................................................33
Table 4-3. Known Spawning and Recruitment Period of select Species with Documented Occurrence .............38
Table 4-4. Seasonal and Daily Activities of select Species Present in Lake Julian.................................................39
Table 4-5. Rare, Threatened, or Endangered Aquatic Species Listed and Record of Occurrence in Lake Julian..41
Table 4-6. List of Fragile Species and their Occurrence near Asheville Combined Cycle Station .........................44
Table 5-1. Water Balance Associated Flows for the ACC......................................................................................50
Table5.2 Calculated TSV.......................................................................................................................................52
Table 6-1. Site -Specific Design of ACC Closed -Cycle Cooling System...................................................................57
Table 8-1. Annual Capacity Factors (%) at ACC Unit 05/06, 2020-2022...............................................................60
Table 8-2. Annual Capacity Factors (%) at ACC Unit 07/08, 2020-2022...............................................................60

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
Figures
Figure 2-1. Map of French Broad -Holston Basin Hydrologic Unit Code 06010105.......................................
Figure 2-2. Duke Energy Progress Environmental Monitoring Program Water Quality Sampling Stations..
Figure 2-2. Asheville Combined Cycle Station Site Location Map.................................................................
Figure 3-1. Asheville Combined Cycle Cooling Water Intake Structure on Lake Julian .................................
Figure 3-2. Layout of the Repurposed Lake Julian Cooling Water Intake Structure (not to scale) ................
Figure 3-3. Photograph of a 1-inch Hexagonal Mesh Screen Panel Employed at the Cooling Water Intake
Figure 4-1. Shoreline Habitat Types and Locations Sampled with Nighttime Electrofishing in Lake Julian ..
Figure 5-1. Water Balance Diagram of the Asheville Combined Cycle Station ..............................................
......16
......17
iv

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
Appendices
Appendix A. Asheville Combined Cycle Station § 122.21(r)(2)-(8) Submittal Requirement Checklist.
Appendix B. Asheville Combined Cycle Station, Pertinent Engineering Drawings.
Appendix C. Asheville Combined Cycle Station, Engineering Calculations for Through Screen Velocity.
v

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
Abbreviations
°C degrees Celsius
°F degrees Fahrenheit
AIF actual intake flow
AOI 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
CPUE catch per unit effort
CTMU cooling tower makeup
CWA Clean Water Act
MIS Cooling Water Intake Structure
DIF design intake flow
Director NPDES Director
DO dissolved oxygen
Duke Energy Duke Energy Carolinas, LLC
EPA Environmental Protection Agency
ESA Endangered Species Act
EPRI Electronic Power Research Institute
fps feet per second
ft foot/feet
ft msl feet above mean sea level
gpm gallons per minute
HUC Hydrologic Unit Code
IPAC Information for Planning Conservation
m meter
µm micron
µS/cm microSiemens per centimeter
m3 cubic meters
MGD million gallons per day
mm millimeters
MW megawatts
MWIS makeup water intake structure
NCDENR-DWQ North Carolina Department of Environment and Natural Resources — Department of Water Quality
NCDNCR North Carolina Department of Natural and Cultural Resources
NDCT natural draft cooling tower
NPDES National Pollutant Discharge Elimination System
OTC once -through cooling
POA percent open area
PVC polyvinyl chloride
Rule Clean Water Act §316(b) rule
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
vi

316(b) Compliance Submittal Requirements
Asheville 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.
Duke Energy Progress, LLC (DEP) constructed a new combined cycle unit at the existing Asheville Steam
Electric Plant (Asheville Plant) in Buncombe County, North Carolina. The generation capacity of the
former Asheville Plant was replaced with the Asheville Combined Cycle Station (ACC), consisting of two
combined cycle power blocks with a summer/winter net electrical generating capacity of 250 MW/280
MW per block. The ACC utilizes closed -cycle mechanical draft cooling towers, which reduce cooling
water withdrawals from the coal-fired units average of 225 MGD to an average of 2.85 MGD and
eliminates the thermal input to Lake Julian. The ACC utilizes the existing CWIS on Lake Julian for raw
water supply, including cooling tower make-up water.
The new ACC is defined as a "new unit" at an existing facility' per 40 CFR 125.92(u). To meet the
impingement mortality and entrainment reduction standards in §125.94(e), the ACC is equipped with
closed -cycle recirculating mechanical draft cooling towers. The §122.21(r) submittal material provided
herein supports a conclusion that the ACC will fully meet the new unit BTA standards at §125.94(e) for
impingement and entrainment reductions and minimizes potential adverse environmental impacts.
Based on the §122.21(r) submittal material provided herein, ACC's chosen method of compliance with
the Impingement Mortality Standard is operation of a closed -cycle recirculating system. Further, ACC
requests that the Department designated the closed -cycle system as Best Technology Available (BTA)
for entrainment reduction. Given that ACC currently employs closed -cycle cooling as described below,
no further impingement or entrainment controls are necessary to comply with the standards.
Impingement BTA
The final Rule, at §125.94(c), requires existing facilities to employ one of seven impingement BTA
alternatives'. ACC already employs one of these alternatives:
' The Rule states in § 125.92(u) that a "New unit means a new 'stand-alone' unit at an existing facility where
construction of the new units begins after October 14, 2014, and that does not otherwise meet the definition of
a new facility at § 125.83 or is not otherwise already subject to subpart I of this part. A stand-alone unit is a
separate unit that is added to a facility for either the same general industrial operation or another purpose. A
new unit may have its own dedicated cooling water intake structure, or the new unit may use an existing or
modified cooling water intake structure."
2 Or under specific circumstances one of nine alternatives, which includes §125.94(c)(11) and (12) in addition to
§125.94(c)(1)-(7).

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
• Primary impingement BTA—Closed-cycle cooling with mechanical draft cooling towers are 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).
Accordingly, this is ACC's preferred option for complying with the impingement standard. Of note, the
ACC raw water intake is configured such that the design through -screen velocity is less than the 0.5
feet/second (fps) standard in the Rule.
Entrainment BTA
The Rule does not prescribe BTA for entrainment but does require BTA to be determined by the
permitting authority on a site -specific basis. Based on information presented here, ACC requests that
the Department designate closed -cycle cooling as BTA for entrainment based on the following:
When compared against the factors in 40 C.F.R. § 122.25(f), closed -cycle cooling provides benefits
to entrainment relative to once -through cooling (OTC) without additional costs. ACC utilizes
closed -cycle cooling, which minimizes entrainment through flow reduction. Using actual cooling
tower flows during the 2020-2022 period, the withdrawal reduction is 99%. Furthermore, the
actual cooling tower flows (2.85 MGD) during the 2020-2022 period are substantially less than the
125 MGD threshold for a permittee to provide a comprehensive review of any entrainment
impacts.
Statements made by the United States Environmental Protection Agency (EPA) in the preamble
to the Rule support a conclusion that closed -cycle cooling is appropriate for designation as BTA
for entrainment:
"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. I (emphasis added)
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.1'4
(emphasis added)
3 79 Fed. Reg. 48344 (15 August 2014)
4 Response to Comments, Essay 14, p. 62.
8

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
Overall, entrainment at the facility is likely to be low and is not expected to involve federally protected
species or their designated critical habitat. Potential impacts to fish and shellfish populations due to
entrainment is also extremely unlikely due to the operation and configuration of the intake. Based on
these findings, the existing closed -cycle cooling is the best technology available for reduction of
entrainment at this facility.
9

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
1 Introduction
Section 316(b) was enacted under the 1972 Clean Water Act (CWA), which also introduced the National
Pollutant Discharge Elimination System (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) to reflect Best Technology Available (BTA) for
minimizing potential adverse environmental impacts.
On August 15, 2014, regulations implementing §316(b) of the final CWA rule (Rule) for existing facilities
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 million gallons per day (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 evaluate an applicants' preferred technology for compliance with the
impingement standard and to make a site -specific Best Technology Available (BTA) determination
regarding entrainment for the facility. The actual intake flow (AIF)' and design intake flow (DIF)6 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 were required to submit their §316(b) application material to their Director with their
next permit renewal application unless that permit renewal application was due prior to July 14, 2018, in
which case an alternate schedule could have been requested.
5 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.
6 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).
10

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
Table 1-1. Facility and Flow Attributes and Permit Application Requirements.
Facility and Flow Attributes Permit Application Requirements
Existing facility with DIF greater than 2 MGD and §122.21(r)(2)-(13)
AIF greater than 125 MGD.
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 used for cooling Director Best Professional Judgment
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)
The new ACC is defined as a "new unit" at an existing facility' per 40 CFR 125.92(u). The new ACC has a
DIF greater than 2 MGD and an AIF less than 125 MGD and, therefore, is not required to submit
information detailed in §122.21(r)(10)-(r)(13) of the Rule. Appendix A provides a checklist summary of
the specific requirements under each of the §122.21(r)(2)-(8) and (r)(14) submittal requirements and
how each is addressed in this report or why it is not applicable to ACC.
Based on the Rule, 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 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 decommissioned Duke Energy Progress, LLC (DEP) Asheville Steam Electric Plant (Asheville Plant)
was located on Lake Julian in Buncombe County, North Carolina. Once -through cooling water from the
former plant was withdrawn from the CWIS on Lake Julian. Supplemental water to maintain water levels
in Lake Julian was withdrawn from an intake located on the adjacent French Broad Rivers.
Per Section 2 of the Mountain Energy Act, the Asheville Plant was decommissioned prior to the January
29, 2020 deadline, replaced by the new Asheville Combined Cycle Plant (ACC). The revised NPDES permit
to authorize ACC discharges was effective July 1, 2019.
' The Rule states that "New unit" means a new "stand-alone" unit at an existing facility where construction of the
new units begins after October 14, 2014, and that does not otherwise meet the definition of a new facility at §
125.83 or is not otherwise already subject to subpart I of this part. A stand-alone unit is a separate unit that is
added to a facility for either the same general industrial operation or another purpose. A new unit may have its
own dedicated cooling water intake structure, or the new unit may use an existing or modified cooling water
intake structure."
a Supplemental water to maintain Lake Julian elevation continues to be withdrawn as needed from the French
Broad River.
11

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
The former coal-fired Asheville Plant was replaced with two natural gas -fired combined cycle power
blocks, each with one combustion turbine, one heat recovery steam generator (HRSG), and one steam
turbine. The ACC employs close -cycled recirculating mechanical draft cooling towers, which significantly
reduced water withdrawal and removed thermal impacts to Lake Julian. The new ACC units utilize the
existing CWIS on Lake Julian for raw water supply, including cooling tower make-up; therefore, the CWIS
on Lake Julian is the point of compliance for the Rule. The existing river intake on the French Broad River
will continue to be used for occasional withdrawals to maintain Lake Julian surface water elevation.
12

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
Table 1-2. Summary of §316(b) Rule for Existing Facilities Submittal Requirements for §122.21(r)(2)-(8) and (14).
Submittal Requirements at §122.21(r)
Submittal Description
(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.
Characterization of the biological community in the vicinity of
the intake; life history summaries; susceptibility to impingement
(4) Source Water Baseline Biological
and entrainment; existing data; identification of missing data;
Characterization 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).
Narrative description of cooling water system and intake
structure; proportion of design flow used; water reuse
(5) Cooling Water System Data
summary; proportion of source waterbody withdrawn
(monthly); seasonal operation summary; ;existing impingement
mortality and entrainment reduction measures; flow/MW
efficiency.
Provides facility's proposed approach to meet the impingement
Chosen Method of Compliance with
mortality requirement (chosen from seven available options);
(6) Impingement Mortality Standard
provides detailed study plan for monitoring compliance, if
required by selected compliance option; addresses entrapment
where required.
Provides summary of relevant entrainment studies (latent
(7) Entrainment Performance Studies
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.
Provides operational status for each unit; age and capacity
utilization for the past 5 years; upgrades within last 15 years;
(8) Operational Status
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.
Identifies the chosen compliance method for the new unit;
based on the method selected will provide information to
(14) New Units
demonstrate closed -cycle cooling or entrainment reductions
that are commensurate with closed -cycle cooling; may also
include additional data and information, as determined by the
Director.
13

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
2 Source Water Physical Data [§122.21(r)(2)]
The information required to be submitted per 40 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 the facility, including areal dimensions, depths, salinity and temperature regimes,
and other documentation that supports the applicant's 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 used to conduct any physical studies to determine
the intake's area of influence within the waterbody and the results of such studies;
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 ACC withdraws raw water for cooling purposes at the existing CWIS on Lake Julian, the source
waterbody. Lake Julian and the adjacent French Broad River are located within the French Broad -
Holston River basin, which includes watersheds in North Carolina and Tennessee. The North Carolina
portion of the French Broad -Holston River basin is 2,830 square miles and lies entirely in the Blue Ridge
ecoregion. The French Broad River originates in Transylvania County, North Carolina, and flows north for
210 miles through western North Carolina into Tennessee, where it joins the Holston River near
Knoxville to form the Tennessee River (NCDEQ 2017). The French Broad -Holston River basin is
predominantly forested; however, it also contains some of the most populated urban areas in the
region, including the mountain municipalities of Asheville, Waynesville, Hendersonville, and Black
Mountain, North Carolina.
Lake Julian was created to serve as part of the cooling system for the Asheville Plant by impounding
Powell's Creek, a tributary of the French Broad River (North Carolina State Board of Health 1963). The
freshwater lake reached full -pool elevation in June 1963 and the Asheville Plant began commercial
operation in 1964. The shoreline -situated CWIS is located within an intake cove on the main body of
Lake Julian. Coal fired operations officially ceased and the combined cycle plant went online 2019/2020.
Historically cooling water for the coal-fired units was circulated from the main body of the lake through
the plant and into the discharge arm. The water from the discharge arm returned to the intake side of
the lake via an opening underneath the railroad trestle (Figure 1-1). The main body of the lake has a
surface area of 215 acres, a maximum depth of 108 feet, and a mean depth of 30 feet. Average surface
14

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
water elevation on Lake Julian is approximately 2,160 feet above mean sea level (ft msl). The average
impounded volume (at elevation 2,160) is approximately 8,819 acre-feet.
Land use in Lake Julian's 4.8-square mile watershed is primarily residential and urban. Lake Julian is a
relatively steep -sided, deep lake and prior to the retirement of the coal-fired units devoid of aquatic
vegetation and other types of naturally occurring underwater structure, resulting in less than optimal
shallow -water fish habitat (Progress Energy 2013). The lake has since seen an increase of aquatic
vegetation, covering nearly 60% of the littoral zone sampled in 2021 (DEP 2021b). The increase in mainly
native aquatic vegetation is due in part to the recent absence of the non-native herbivorous Blue Tilapia.
The cessation in reject heat from steam electric generation to lake Julian has significantly reduced the
likelihood of Blue Tilapia over -wintering in the small mountain reservoir (Sections 2.2.3 and 4.2.1).
Artificial structures (submerged and cabled trees, fish reefs, etc.) have been placed along shorelines by
DEP during periodic fish habitat enhancement activities to improve fish habitat in Lake Julian.
Cooling tower make-up water for the ACC units is withdrawn from the existing CWIS on Lake Julian with
the cooling tower blowdown being discharged to an existing outfall on the French Broad River. As such,
the remainder of this document is focused on Lake Julian, the source waterbody for the ACC CWIS, for
establishing compliance with the Rule's impingement and entrainment BTA standards.
2.1.1 Water Quality
Water quality data from Lake Julian has been periodically collected by DEP since 1973 as part of an
Environmental Monitoring Program (Program). The Program has included periodic data collections
targeting water chemistry, phytoplankton, zooplankton, benthic invertebrates, and fish communities
(DEP 2023). Water quality sampling for Lake Julian is performed on alternate months (i.e., January,
March, May, July, September, and November) at Stations GS2 and D2 (see Figure 2-2). These data are
summarized in the following section. Water quality sampling for location GS2 ceased at the end of 2020
following the retirement of the coal-fired units.
Water quality and limnological data collected from Lake Julian (Station D2 - near the CWIS) from 2012-
2021 under the Program (DEP 2023) are summarized in Table 2-1.
15

316(b) Compliance Submittal Requirements
Asheville Combined Cvcle Station
CZ g,h
LEGEND
Boone
Fayette
8 Digit Hydrologic Units
Station Location
06010101 - North Fork Holston
French Broad -Holston River
�J Basin
G6010102 - South Fork Holston
Raleigh
County Boundaries
06010103 -Watauga
State Boundaries
wyomng
Summers
06010104 -Holston
CATA SOURCE: MCCC-0 :]1i
Mercer
06010105 - Upper French Broad
MoDowell
46010106 -Pigeon
- _k _­1
f
06010107 - Lower French Broad
0 Miles 25
Giles
gland
06010108 - Nolichucky
Tazewell
U
f . t5e
f• m
N
Knox
Russell
Harlan
-
Smyth
Wythe
Bell
Whitley �'
F nw
Scott �ri ashington
LPe
�g,�
Carroll
Grayson
Clabome Hancock
Swim
E Haw
Johnson
All,ghany
Um u cn _ r�tw. ._ 40 °"'�
R Ashe
Surry
)(I, Washington
rribten
A R Greene
Sevieri
Blount
if
Bur, mhe
$Yiin
-
Graham
Jackson dens
Cherokee Macon
Trans y is
Clay
�
'— —_
Greenville
Towns
Rabun
Pickens
,lmcn
Oconee
Whie Habersham
Anderson
uga VPilkes
• *w' Caldwell
Alexander
Iredell
Burke
IcOowell Catawba
.Asheville Combined
-" Cycle Station
LinWn
,wa Mid4an
Pennsylvania
a inois
Indiana Ohio
West V'rgisia Maryland
Debw3 `c
lissoun Kentucky Virginia
Tennessee i North Camlha
rkansas
South Cara9ina
WssissippiAlabama Georgia
ouisiana *bnda
Figure 2-1. Map of French Broad -Holston Basin Hydrologic Unit Code 06010105
16

�.:.Or
LEGEND
f
0 River intake
,u
s , . W
�3uhrnerged Cuiuert...
fish Reefs •
Lake Julian
oz
C'vV1S-
Discharge 4 -

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
Table 2-1. Annual Mean Concentration for Select Parameters Documented in Surface Water Samples Collected in
Lake Julian (Station 1132) (DEP 2022b)
Parameter
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
Water Temperature (°C)
24.9
21.5
22.7
23.7
23.7
23.6
22.7
22.5
17.0
16.8
Specific Conductance
110
90
73
82
91
86
80
89
92
87
(PS/cm)
Dissolved oxygen (mg/L)
8.1
8.5
7.6
7.5
7.6
7.9
8.2
7.8
8.8
9.1
Total dissolved solids (mg/L)
50
39
44
42
58
40
40
59
57
48
Turbidity (NTU)
2.6
2.6
2.0
1.8
3.0
2.3
1.9
1.2
1.3
0.8
Secchi depth (m)
2.9
2.3
3.9
4.2
3.7
3.2
3.2
3.5
6.4
9.3
Chlorophyll a (Ng/L)
9.9
4.6
3.6
2.2
6.4
3.9
4.0
3.8
1.3
2.5
Nutrients (mg/L)
Ammonia-N
0.022
0.031
0.02
0.07
0.016
0.024
0.03
0.024
0.033
0.035
Nitrate + nitrite-N
0.03
0.12
0.24
0.15
0.15
0.04
0.13
0.2
0.14
0.11
Total nitrogen
0.14
0.35
0.45
0.33
0.32
0.36
0.21
0.48
0.43
0.37
Total phosphorus
0.012
0.106
0.012
0.016
0.008
<0.005
0.008
0.006
<0.01
0.02
Total organic carbon (mg/L)
2.5
3.0
2.4
1.8
1.9
1.8
1.9
1.8
1.9
1.7
Ions (mg/L)
Calcium
8.9
5.6
2.0
2.8
4.6
3.8
1.8
3.9
5.2
6.3
Chloride
10
8.5
9.3
11.0
11.9
11.3
12.3
12.0
10.7
10.4
Magnesium
2.6
2.3
2.4
2.2
2.5
2.4
2.2
2.3
2.3
2.3
Sodium
5.9
5.0
6.0
7.0
7.9
8.0
8.0
7.6
6.7
6.4
Sulfate
8.2
5.7
5.9
5.2
5.0
4.3
4.0
4.2
4.1
3.4
Total alkalinity (mg/L as CaCO3)
25
20
20
11
18
16
10
30
20
24
Hardness (mg equiv. CaCo3/L)
33
24
24
16
22
19
13
19
23
25
mg/L: milligrams per liter; m: meter; NTU: nephelometric turbidity units
pg/L: micrograms per liter; CaCO3/L: calcium carbonate
The mean annual nutrient concentrations (i.e., ammonia-N, nitrate+nitrite-N, total nitrogen, total
phosphorus, total organic carbon) measured in Lake Julian from 2012 to 2021 were consistent both
spatially and temporally, with the exception of total nitrogen. Mean total nitrogen concentrations were
elevated in 2014, 2019, and 2020 compared to the remaining data years (i.e., 2012, 2013, 2015, 2016,
2017, 2018 and 2021). Lake Julian has been determined to have low biological productivity (oligotrophic
conditions) based on the monthly calculated North Carolina Trophic State Index scores by NCDEQ
(NCDEQ 2018b). No adverse trends were observed for water chemistry characteristics of Lake Julian
during the period of monitoring.
Water clarity (transparency) depth as measured by Secchi disk in Lake Julian was consistently between
2.3 and 3.5 meters (m) during coal fired operation (2012-2019). Once the new combined cycle units
went online (2020-2021) water clarity depth as measured by Secchi disk increased to 6.4 and 9.3
respectfully (see Table 2-1). Turbidity was also low with an average of 2.0 NTU across all years. The
18

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
annual mean concentrations of total dissolved solids were consistent over the monitoring period and
displayed normal variation typically observed in comparably sized reservoirs in the region.
Thermal stratification typically develops during the spring/summer months in the main body of the lake
resulting in low dissolved oxygen (DO) conditions (i.e., less than 4 mg/L) in the hypolimnion (the bottom
strata of a thermally stratified reservoir or lake). Typically, by November, oxygenated water returns to
the deeper portions of Lake Julian after lake turn over (DEP 2023). Historical DO concentrations were
consistently greater than 4 mg/L (minimum DO required by most healthy fish) in the epilimnion (DEP
2023).
Mean specific conductance data were consistent across the data collection period, with values between
73 micro -Siemens per centimeter (µS/cm) in 2014 to 110 VS/cm in 2012 (Table 2-1). The range of values
documented for Lake Julian between 2012 and 2021 is consistent with freshwater systems in the region
(DEP 2023).
The annual mean surface water temperatures recorded at Station D2 exhibited minimal inter -annual
variation during coal fired operation (2012-2019), ranging between 21.5 degrees Celsius (°C) (2013) and
24.9°C (2012) (see Table 2-1). With the commencement of the ACC, blow -down and other byproducts of
the units were routed to an existing outfall on the French Broad River and the thermal discharge into
Lake Julian was terminated. As a result, the annual average water temperatures in Lake Julian were
reduced to 17.0°C (2020) and 16.8°C (2021), more reflective of a small, mountain watershed.
2.2 Characterization of Source Waterbody [§122.21(r)(2)(ii)]
To identify and characterize the primary source waterbody (i.e., Lake Julian), the following resources
were reviewed:
• Duke Energy Environmental Monitoring Program 2012-2021 (DEP 2023).
• Ecoregions of North Carolina (Griffith et al. 2002).
Data were compiled, synthesized, and are summarized below.
2.2.1 Hydrology
Lake Julian is located within the French Broad -Holston Basin, which is divided into eight U.S. Geological
Survey hydrologic units, each designated by a Hydrologic Unit Code (HUC). Lake Julian lies within the
Upper French Broad River subbasin HUC 06010105 (Figure 2-1). The drainage area of the Upper French
Broad River subbasin is approximately 1,864 square miles.
2.2.2 Geomorphology
Lake Julian is located within the Blue Ridge Level III ecoregion and, more specifically, the Broad Basins
(Level IV) of the Blue Ridge ecoregion. The Blue Ridge ecoregion extends from southern Pennsylvania to
northern Georgia and varies in topography from narrow ridges to hilly plateaus to more mountainous
areas with high peaks. The mostly forested slopes, high -gradient streams, and rugged terrain occur over
a mix of igneous, metamorphic, and sedimentary bedrock (Griffith et al. 2002).
19

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
2.2.3 Determination of Area of Influence — Desktop Calculations
Cooling tower make-up water is withdrawn at the Lake Julian CWIS which is comprised of four identical
intake bays. Each bay will be equipped with a submersible pump with a design capacity of approximately
1,800 gallons per minute (gpm) (2.6 MGD). The ACC consists of two units (Unit 05/06 and Unit 07/08)
that are designed to operate with two pumps (one per unit), with the remaining two pumps providing
redundant pumping capacity. As a result, the combined DIF capacity for the new ACC units will be 3,600
gpm (5.2 MGD). However, the provided DIF is improbable due to pump logic configuration which allows
only one pump for each unit to operate. The CWIS is equipped with 1-inch hexagonal mesh fixed
screens attached to the upstream face of the bar racks and oriented perpendicular to the direction of
flow. In addition, new %-inch mesh fixed screens will be installed on the downstream side of the 1-inch
hexagonal mesh panels as additional protection for the new submersible pumps.
TSV calculations for were performed for the new %-inch mesh screens under low water surface
elevations (2,158.0 feet). Inputs used to perform TSV calculations are provided in Table 2-2; the TSV
calculation package is provided in Appendix C.
The average TSV for the new %-inch mesh screen panels at design flows and low water surface elevation
is 0.09 fps (Table 2-2). This calculated TSV is considerably lower than the 0.5 fps threshold used as the
BTA standard for impingement mortality (§125.94(c)(2)). Impingement at the CWIS on Lake Julian is
negligible because the impingement A01 does not extend beyond the face of the screen.
Table 2-2. Summary of Input Parameters for TSV Calculations of CWIS on Lake Julian
TSV Calculation Inputs
New 1/4-inch Mesh Fixed Screens
Unit 05/06 Unit 07/08
Number of screens
2
2
Elevation at bottom of intake (feet)
2,144
2,144
High water surface elevation (ft msl)
2,165
2,165
Low water surface elevation (ft msl)
2,158
2,158
Screen width (feet)
9 feet 2 inches
9 feet 2 inches
Mesh size (L) (inches)
0.25
0.25
Mesh size (W) (inches)
0.25
0.25
Mesh gauge number
16
16
Cooling Water Pump Max Rating (gpm)
2900
2900
Cooling Water Pump 2 Max Rating (gpm)
2900
2900
Cooling Water Pump 1 Design Rating (gpm)
1,800
1,800
Cooling Water Pump 2 Design Rating (gpm)
1,800
1,800
TSV at max pump rating and low water surface
elevation (fps)
0.14
0.14
TSV at design pump rating and low water
surface elevation (fps)
0.09
0.09
20

Ashe ille _ +vannanoa
t V A.,
��Candle&:
• �.. � ••; Biltmore Forest
• -, -�-VF,airview
"Bent Creek �'
=Arden '
t •a fetcher '
'� 4

316(b) Compliance Submittal Requirements
Asheville 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 CWIS Configuration [§122.21(r)(3)(i)]
Cooling water for the ACC is supplied though the CWIS on Lake Julian situated on the southern shoreline
of the western arm of Lake Julian (Figure 3-1). The following sections provide additional information on
the configuration and operation of the CWIS on Lake Julian.
22

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
Figure 3-1. Asheville Combined Cycle Cooling Water Intake Structure on Lake Julian, Buncombe County, North
Carolina
The approximately 60-foot-wide CWIS on Lake Julian was originally constructed for the Asheville Plant
and has been repurposed for the ACC. The CWIS is comprised of four equally -sized intake bays (referred
to as Intake Bays 1, 2, 3, and 4). A summary of the original CWIS major components and those that have
been repurposed or replaced is provided in Table 3-1. The general layout of the repurposed CWIS is
shown in Figure 3-2. The opening of each of the four intake bays is approximately 21 feet high by 9 feet,
two inches wide with an invert elevation of 2,144 ft msl (see drawing G-171048 in Appendix B). Each bay
is equipped with a bar rack, two sets of fixed mesh screen panels (1-inch and %-inch), and a submersible
make-up cooling water pump.
Table 3-1. Original and Repurposed Cooling Water Intake Structure Components
Description of Major CWIS Components
Unit 05/06
Unit 07/08
Number of intake bays
2
2
Intake bay dimensions
21 feet high x
9 feet, 2 inches wide
21 feet high x
9 feet, 2 inches wide
Elevation at bottom of intake (feet)
2,144
2,144
1-inch hexagonal mesh fixed screen panel
2
2
Bar racks
2
2
Y..-inch mesh fixed screen panel
2
2
Once -through condenser cooling water pump capacity (gpm)
2 x 48,300
2 x 61,500
Submersible make-up cooling water pump capacity (gpm)
2 x 1,800*
2 x 1,800*
*Units 05/06 and 07/08 are designed to operate using one 1,800 gpm each, the remaining pump is for backup
23

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
Figure 3-2. Layout of the Repurposed Lake Julian Cooling Water Intake Structure (not to scale)
Near the entrance of the CWIS, 1-inch hexagonal mesh screens (comprised of 19-gauge wire) are
overlain on the exterior side of the bar racks (3/8-inch-thick steel bars with 3-inch on center spacing) to
help prevent large debris from entering the structure, as illustrated in Figure 3-3. The new %-inch mesh
(16-gauge wire) fixed screen panels are located approximately 16.5 feet downstream of the bar racks in
the slots formerly used for traveling screens (see drawing G-171048 in Appendix B). The new screens are
on the upstream side of the new submersible cooling water make-up pumps and provide an added layer
of protection from debris that is able to pass through the outer 1-inch hexagonal mesh screens and bar
racks.
24

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
Figure 3-3. Photograph of a 1-inch Hexagonal Mesh Screen Panel Employed at the Cooling Water Intake
Structure on Lake Julian
Each bay is equipped with a submersible pump with a design capacity of approximately 1,800 gpm (2.6
MGD). Raw water is withdrawn from Lake Julian, where it passes through the 1-inch hexagonal mesh
screen panels, bar racks, and Y4-inch mesh screen panels before entering the submersible pumps. Design
drawings for the Lake Julian CWIS are provided in Appendix B.
3.2 Latitude and Longitude of CWIS [§122.21(r)(3)(ii)]
The latitude and longitude (in degrees, minutes, and seconds) of the CWIS on Lake Julian is provided in
Table 3-2.
Table 3-2. Cooling Water Intake Structure Coordinate Information
(Source: DEP 2005, DEP 2007)
Intake Latitude Longitude
Intake on Lake Julian 35°28'20.7" N 82°32'35.4" W
3.3 Description of CWIS Operation [§122.21(r)(3)(iii)]
The ACC facility operates as a base load facility with year-round condenser cooling water operations.
The ACC operates by utilizing one 1,800 gpm (2.6 MGD) capacity pump per Unit (power block) for a total
facility DIF of 5.2 MGD. Raw water pump 5A or 56$ supplies raw water, including cooling water, to Unit
05/06 and raw water pump 7A or 7B supplies raw water, including cooling water, to Unit 07/08 (Figure
s Each of the power blocks are operated with cooling water supplied from one of the two pumps dedicated to the
power block. For example, with Units 05/06 only one of the two pumps (5A or 513) will be actively pumping water
at any given time. The remaining pump serves as a redundant pump to maintain operations during scheduled or
unplanned repairs to the other pump.
25

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
3-2). Note only two pumps (one for each power block) will be operational at any one time, with the
remaining two pumps providing redundant pumping capacity.
Table 3-3. Number of Hours of Unit 05/06 Cooing System Operation at ACC in 2020-2022.
2020-2022
Month
2020
2021
2022
Average
January
736
744
707
729
February
687
672
624
611
March
529
743
743
672
April
287
80
24
130
May
119
152
0
90
June
226
539
606
457
July
744
711
743
733
August
744
744
744
744
September
500
720
720
647
October
744
505
744
664
November
538
278
721
512
December
552
565
611
576
Total Number of Hours 6406 6453 6987 6615
Table 3-4. Number of Hours of Unit 07/08 Cooling System Operation at ACC in 2020-2022.
2020-2022
Month
2020
2021
2022
Average
January
594
744
744
694
February
511
537
587
545
March
195
585
575
452
April
672
703
687
687
May
498
742
744
661
June
684
720
720
708
July
742
664
744
717
August
740
609
707
685
September
595
551
378
508
October
82
346
5
144
November
590
721
534
615
December
744
707
744
732
Total Number of Hours 6647 7629 7169 7148
26

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
3.4 Description of Intake Flows and Water Balance
[§122.21(r)(3)(iv)]
Monthly average water withdrawals from 2020 through 2022 are provided in Table 3-5. The average
withdrawal for this period was 2.6 MGD from the raw water intake compared to a DIF of 5.2 MGD. The
Water Balance Diagram for ACC is provided in Table 5-1.
Table 3-5. Monthly Withdrawals (MG) from ACC Intake during 2020-2022 to Support Plant Operations.
Month
2020
2021
2022
2020-2022
Average
January
34.2
74.9
98.5
69.2
February
36.4
67.4
87.3
63.7
March
45.4
80.1
102.6
76.0
April
47.2
63.6
89.1
66.6
May
60.2
70.8
94.7
75.2
June
69.0
84.4
110.7
88.1
July
88.8
90.1
117.9
99.0
August
91.9
90.1
120.1
100.7
September
76.1
80.2
101.3
85.8
October
57.9
64.1
85.4
69.1
November
67.1
69.4
98.0
78.2
December
69.1
82.3
96.5
82.6
Annual Average
62.0
76.4
100.2
79.5
3.5 Engineering Drawings of CWIS [§122.21(r)(3)(v)]
A list of design drawings for the CWIS on Lake Julian is provided in Table 3-6 and the drawings are
provided in Appendix B.
Table 3-6. List of Engineering Drawings for ACC Intakes
Structure
Type
Drawing No.
Drawing Title
CWIS on Lake Julian
As -built
C-219-D
Concrete Intake Structure
CWIS on Lake Julian (Unit 1 Plan &Sections G-170903 Cooling Water System Intake -
Intake) MAS SH NO 1
CWIS on Lake Julian Plan & Sections G-171048 Intake Steel & Screens
Y..-inch Mesh Fixed Screen
General Arrangement E117624 Static Screen
Panel
27

316(b) Compliance Submittal Requirements
Asheville 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.
28

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
4.1 List of Available Biological Data [§122.21(r)(4)(i)]
The biological data needed to prepare the information required under 40 Code of Federal Regulations
(CFR) §122.21(r)(4) are available. The 2012-2021 Environmental Monitoring Report (DEP 2023) was used
to develop the baseline biological characterization of the source waterbody, Lake Julian.
This report was developed utilizing the existing, available data for Lake Julian. As the selected ACC
technology is fully compliant with the Rule, no impingement or entrainment studies were performed in
support of the development of this compliance documentation. No additional studies were performed
to support the baseline biological characterization for the proposed ACC.
4.2 List of Species and Relative Abundance in the vicinity of CWIS
[§122.21(r)(4)(ii)]
Since 1973, DEP has performed periodic sampling of the fish community at multiple locations within
Lake Julian (Figure 4-1). The objectives of the Lake Julian Environmental Monitoring Program (Program)
are to assess the lake's overall water quality and the fishery community and document the introductions
and/or possible impacts of non-native or exotic species to the lake. The following sections summarize
the data collected from Lake Julian under the Program.
4.2.1 Lake Julian Environmental Monitoring Program
Under the Program, as described in Section 2, data are collected and used to characterize the fish
community in Lake Julian. Data from sampling activities performed on Lake Julian from 2012 through
2021 are summarized below. Historically DEP, previously Carolina Power & Light Company (CP&L),
performed nighttime boat electrofishing at 30 shoreline sampling locations in Lake Julian, representing 6
shoreline habitat types (CP&L 2001). These long-term sampling locations are shown on Figure 4-1. The
entire length of the shoreline for each sampling location was sampled and catch rates were adjusted to
number per hour of sampling time. Since 2012, annual nighttime boat electrofishing sampling has been
performed, consisting of a spring and fall sample at 16 shoreline locations in Lake Julian representing the
same 6 shoreline habitat types (DEP 2023). The entire length of the shoreline for each sampling location
was sampled and catch rates were adjusted to number per hour of sampling time. The only exceptions
are 2013, 2017, and 2020 no sampling occurred. Additionally, sampling only occurred once per year in
2019 (spring) and 2021 (fall).
Relative abundance for the species collected during electrofishing of Lake Julian (2012-2021) is
summarized in Table 4-1. Species composition in Lake Julian has remained fairly consistent, varying
between 12 species in 2019 and 16 species in 2014. Length frequency data indicated that recreational
species such as Bluegill (Lepomis macrochirus), Redear Sunfish (Lepomis microlophus), Redbreast Sunfish
(Lepomis auratus), Largemouth Bass (Micropterus salmoides), and Alabama Bass (Micropterus henshalli)
exhibit both adequate reproduction and recruitment for a self-sustaining population.
29

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
Figure 4-1. Shoreline Habitat Types and Locations Sampled with Nighttime Electrofishing in Lake Julian, 2012-
2021(CP&L 2001, DEP 2023)
30

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
Table 4-1. Relative Abundance of Fish Collected in Electrofishing Samples on Lake Julian, 2012, 2014, 2015, 2016,
2018, 2019, 2021(DEP 2023).
Scientific Name
Common Namea
2012
2014
Relative Abundance (Percent)
2015 2016 2018
2019c
2021c
Lepomis macrochirus
Bluegill (R)
76.2
58.7
39.2
45.7
45.8
48.7
34.5
Lepomis spp.
Hybrid Sunfish (R)
10.8
12.5
11.4
16.4
12.1
6.5
5.3
Lepomis auratus
Redbreast Sunfish (R)
0.4
1.7
2.4
4.4
6.5
8.2
9.2
Lepomis cyanellus
Green Sunfish (R)
5.0
9.0
17.4
13.1
7.1
3.1
8.9
Lepomis gulosus
Warmouth (R)
0.1
1.5
1.7
0.5
0.1
0.1
0.9
Lepomis microlophus
Redear Sunfish (R)
1.5
2.6
5.7
5.4
7.5
7.7
2.7
Micropterus salmoides
Largemouth Bass (R)
1.4
3.2
3.2
3.9
4.0
7.9
12.4
Micropterus henshallib
Alabama Bass (R)b
1.2
5.6
6.4
4.8
10.1
9.9
25.2
Micropterus sp.
Largemouth Bass x Alabama
Bass Hybrid (R)
-
-
-
< 0.1
-
-
0.1
Pomoxis nigromaculatus
Black Crappie (R)
< 0.1
< 0.1
< 0.1
-
0.2
0.1
0.1
Ictalurus punctatus
Channel Catfish (R)
1.0
1.6
2.2
2.1
1.1
3.3
0.6
Ameiurus platycephalus
Flat Bullhead (R)
-
-
-
-
< 0.1
-
<0.1
Dorosoma petenense
Threadfin Shad (F)
< 0.1
1.0
7.7
3.0
3.6
-
-
Dorosoma cepedianum
Gizzard Shad (F)
-
-
-
< 0.1
-
-
-
Alosa pseudoharengus
Alewife (F)
< 0.1
-
-
-
-
-
-
Tilapia aurea
Blue Tilapia (E)
2.3
2.5
2.5
0.7
2.0
4.5
Pterygoplichthys pardolis
Amazon Sailfin Catfish (E)
-
< 0.1
0.1
-
< 0.1
0.1
Ctenopharyngodon idella
Grass Carp (S)
-
-
-
< 0.1
-
-
Gambusia holbrooki
Eastern Mosquitofish (F)
-
< 0.1
-
-
-
-
Carassius auratus
Goldfish (F)
-
< 0.1
< 0.1
-
-
-
Etheostoma flabellare
Fantail Darter (F)
-
-
-
-
-
-
< 0.1
a) R: Recreational; F: Forage; E: Exotic, non-native; S: Stocked
b) Previously referred as Spotted Bass (Micropterus punctulatus)
c) 2019 sampled in spring and 2021 sampled in the fall.
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4.2.2 Conclusions from Lake Julian Sampling Program
Long-term fish community monitoring results indicate the fish community is not dominated by pollution -
tolerant species, but rather by native sunfish (centrarchids) and other recreational species from multiple
size classes indicating a biological community with the capacity to sustain themselves through cyclic
seasonal changes (DEP 2023). Two exotic (non-native) species were also documented in Lake Julian, (i.e.,
Blue Tilapia [Tilapia aurea] and Amazon Sailfin Catfish [Pterygoplichthys pordalis]). The Amazon Sailfin
Catfish was first documented during 1997 and was most recently collected in 2019, although relative
abundance was low at 0.1 percent (DEP 2022b). In 1965, Blue Tilapia were experimentally stocked by
the North Carolina Wildlife Resources Commission to provide additional forage for Largemouth Bass.
Blue Tilapia subsequently became established in Lake Julian; however, results from periodic
electrofishing studies consistently indicate low relative abundance (varying between 0.7 to 4.5 percent
from study data collected between 2012 and 2019).
Changes associated with operation of the ACC facility (i.e., elimination of the thermal plume in Lake
Julian) did not result in an adverse environmental impact to the native aquatic organisms in Lake Julian
because they are naturally adapted to the ambient conditions of Lake Julian (a small, mountain lake).
However, populations of the exotic Blue Tilapia and Amazon Sailfin Catfish are expected to be reduced
or eliminated from Lake Julian with the removal of the thermal inputs from the retired coal fired station.
During our sampling post thermal discharge (2021), no Blue Tilapia or Amazon Sailfin Catfish were
observed. Additionally, Threadfin Shad, a fragile species that typically experiences varying levels of
winter mortality in response to cold shock were absent in the 2019 and 2021 surveys. As such, the
removal of thermal inputs may result in winter mortalities or potentially lead to the reduction and
potential elimination of this species in Lake Julian.
4.3 Identification of Species and Life Stages Susceptible to
Impingement and Entrainment [§122.21(r)(4)(iii)]
4.3.1 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 ongoing or historical impingement studies have been performed at the CWIS on Lake Julian. The ACC
makeup cooling water is withdrawn from Lake Julian through fixed mesh screen panels with a TSV of
much less than 0.5 fps; thus, the ACC closed -cycle cooling system design is fully compliant with
Compliance Alternative 2 (§125.94(c)(2)). As such, no species or life stages are anticipated to be
32

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
susceptible to impingement at the Lake Julian CWIS. In addition, the ACC's closed -cycle recirculating
cooling water system (CCRS) is compliant with §125.94(e)(1).
4.3.2 Entrainment
Ichthyoplankton, which is defined as 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 will
spend only a portion of its life cycle susceptible to entrainment, as larger juvenile and adult life stages
are excluded by screens at the CWIS. Life history characteristics can influence the vulnerability of a fish
species to entrainment. For example, broadcast spawners have free-floating eggs which drift with water
currents and can be entrained in a CWIS; however, species with adhesive eggs or nest building species
will be less susceptible to entrainment of early life stages.
DEP has regularly performed electrofishing surveys in Lake Julian near the CWIS. Historical electrofishing
sampling results for Lake Julian were used to determine species composition of Lake Julian and to
identify those species potentially susceptible to entrainment at the CWIS on Lake Julian. The evaluation
of species -specific susceptibility to entrainment is presented in Table 4-2.
Based on the anticipated make-up water withdrawal volumes that will be required for operation of the
ACC, and the calculated TSV values presented in Section 3, interactions with aquatic organisms are
expected to be limited, with an extremely low potential for adverse environmental impacts.
Two species in Lake Julian are considered "potential to be" susceptible to entrainment, Gizzard and
Threadfin Shad (Table 4-2) are broadcast spawners with high fecundity. While there is some potential
for species in Lake Julian to be susceptible to entrainment, the low TSV and low make-up water
withdrawal rate at this facility are expected to minimize entrainment and related potential for adverse
impacts to the biological community.
Table 4-2. Entrainment Potential for Fish Species Identified in Lake Julian
Species Habitat Use/Preference Potential for Entrainment'
(Common Name)
Centrarchidae
Construct nests around vegetation Unlikely due to water depth in the vicinity of the CWIS,
Black Crappie close to other nests demersal and adhesive eggs, parental care of nest until
larvae swim -up
Nest generally constructed in shallow Unlikely due to water depth in the vicinity of the CWIS,
Bluegill waters demersal and adhesive eggs, parental care of nest until
larvae swim -up
Green Sunfish Construct nests around vegetation Unlikely; limited quantity of vegetation available in the
vicinity of the CWIS
Largemouth Bass Nest constructed in shallow areas of Unlikely due to water depth in the vicinity of the CWIS
one to six feet
Redbreast Sunfish Construct nests over silt -free or lightly Unlikely; specific substrate type not present
silted sand and gravel in cover
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316(b) Compliance Submittal Requirements
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Species
Habitat Use/Preference
Potential for Entrainment*
(Common Name)
Unlikely due to water depth in the vicinity of the CWIS,
Redear Sunfish
Nest generally constructed in shallow
demersal and adhesive eggs, parental care of nest until
waters
larvae swim -up
Unlikely due to water depth in the vicinity of the CWIS,
Alabama Bass
Nest builder
demersal and adhesive eggs, parental care of nest until
larvae swim -up
Warmouth
Construct nests in cover
Unlikely; no cover near intake
Cichlidae
Nest builders and young develop
Unlikely due to habitat preference, life history
Blue Tilapia
inside of female
requirements, and reproduction tendency
Clupeidae
Alewife
Broadcast spawners
Unlikely due to low numbers
Gizzard Shad
Broadcast spawners
Potential, broadcast spawner increases susceptibility
Threadfin Shad
Broadcast spawners
Potential, broadcast spawner increases susceptibility
Cyprinidae
Lays adhesive eggs in shallow
Unlikely due to absence of shallow, vegetated habitat in
Goldfish
vegetation, introduced species
the vicinity of the CWIS
Demersal eggs, stocked populations
Grass Carp
are triploid and sterile. Illegal to stock
Unlikely; stocked species are triploid and sterile
this species unless triploid
Ictaluridae
Brown Bullhead
Females lay eggs in dark shallow areas
Unlikely due to habitat preference
under rocks and inside logs
Cavity nesters, found in large open
Channel Catfish
areas with woody debris, bank
Unlikely due to habitat preference
cavities; moderate currents
Flat Bullhead
Cavity nesters
Unlikely due to habitat preference
Loricariidae
Amazon Sailfin
Unlikely due to habitat preference and life history
Catfish
Lay eggs in burrows and guard eggs
requirements
Poeciliidae
Eastern
Young develop inside female
Unlikely because they are live -breeders
Mosquitofish
*TSV below 0.5 fps at the CWIS 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.
The retirement of the Asheville Plant and operation of the new ACC reduces the potential for
entrainment on Lake Julian and results in a reduction of total withdrawal volumes at the intake
structure. The change from once -through cooling to closed -cycle cooling therefore has a reduced
potential impact on the health of the fishery and reduces the potential for entrainment on Lake Julian.
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316(b) Compliance Submittal Requirements
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4.3.3 Life History Information for Species Susceptible to Entrainment
A subset of species present in Lake Julian with the likelihood to be entrained was selected for detailed
life history descriptions including reproduction, recruitment, and peak abundance. Threadfin Shad and
Gizzard Shad were selected as target species because of their respective reproduction strategy (i.e.,
broadcast spawner or floating eggs). Bluegill was also selected as a target species because it was the
most abundant species in historical electrofishing collections, is a substantial contributor to the
recreational fishery, and is an important forage species for game fish. Other selected species that
contribute to the recreational fishery of Lake Julian and were among the most dominant species
collected in historical electrofishing sampling include Green Sunfish, Largemouth Bass, and Alabama
Bass.
Of the selected species, Gizzard Shad is recognized as having the highest potential for entrainment at
the CWIS.
• Threadfin Shad
Spawning occurs in shallow waters such as near shorelines or riverbanks. Threadfin Shad spawn from
April to Jul in water temperatures above 16°C between dawn and sunrise. Spawning occurs near the
shoreline and over aquatic plants and other submerged objects with eggs that are demersal and
adhesive. Threadfin Shad are sensitive to sudden changes in water temperature and oxygen content
resulting in frequent die -offs in late summer and winter.
• Gizzard Shad
Gizzard Shad spawning can occur from mid -March to late August, with peak population spawning in May
and June at water temperatures ranging from 15.6-22.8'C (Wallus et al. 1990). They spawn in large
schools and their adhesive eggs are deposited on roots, fibers, and debris along the shore (Miller 1960).
Gizzard Shad are extremely prolific spawners and can deposit as many as 400,000 eggs at one time
(Tomelleri and Eberle 1990).
• Bluegill
Bluegill occur in most rivers and lakes in the southeastern U.S. and are frequently found in backwater
habitats containing vegetation and woody debris. Bluegill spawn at water temperatures between 19.4
and 26YC (Cornish and Welke 2004; Spotte 2007). The spawning season begins in spring or early
summer when the water temperature reaches approximately 21.1°C with the peak of spawning in the
mid -Atlantic region occurring in May or June. Individual fish may spawn several times within the same
season (Rohde et al. 1994).
Bluegill are colonial breeders in the sense that spawning fish build nests that are usually in close
proximity to each other. Males construct nests that are approximately 1-foot in diameter in shallow
water (i.e., depths of 1 to 3 feet). The eggs from several females can be fertilized and deposited in the
nest, which is then defended by the male until the eggs have hatched. Because the nests are located in
shallow depths, water level fluctuations can severely impact successful reproduction as nests can be
stranded by low water level or disrupted by strong wave action. The adhesive eggs hatch after 72 hours
35

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
at 22.2°C and 34 hours at 26.7°C (Cornish and Welke 2004). The yolk sac is absorbed when larvae are 6
millimeters long, at which time they leave the nest and move into littoral vegetation. Fry are free
swimming after approximately 10 days (Carlander 1977). Fecundity ranges from 2,000 to 8,000 eggs at
age 3 and up to 60,000 eggs at ages 4 to 8.
• Green Sunfish
Green Sunfish have a wide tolerance to many different aquatic conditions. They prefer smaller, low -
velocity streams and ponds but can inhabit lakes with weedy shorelines and shallow rivers. Green
Sunfish are tolerant to both turbid and clear water (Etnier and Starnes 1993). Green Sunfish have an
extended spawning period from June to August during which time a single male will construct several
nests (Hunter 1963). Green Sunfish are prolific colonizers and are tolerant of warm, turbid water making
them the most abundant and adaptable of all the sunfishes. Spawning occurs when the water
temperature rises above 21°C. Bluegill and Green Sunfish have similar fecundity rates and produce
approximately up to 50,000 eggs. Eggs hatch after 1 to 2 days and generally stay with the male for 5 to 7
days for protection before the fry become independent.
• Largemouth Bass
Largemouth Bass spawn when water temperatures reach 15.6-23.9 °C (Heidinger 1975). The male builds
a nest in substrate typically comprised of rocky sand or gravel and cleared of organic debris and silt
(Emig 1966; Rohde et al. 1994; Pflieger 1997). The nests are 2 two 3 feet in diameter and usually widely
spaced (i.e., 30 feet apart) unless the available nesting area is limited. Nests are built in areas of no
current or wave action (Pflieger 1997) at depths of 1 to 15 feet.
Males remain at the nest to fan the eggs to keep them silt -free and to protect the young for up to two
weeks (Pflieger 1997). Eggs hatch in 2 to 5 days (Emig 1966) and the fry form tight schools over the nest
and begin to feed in five to eight days. The schools break up approximately 1 month after hatching when
the young bass are approximately one inch long. Growth rates are variable and depend on the lake
productivity and food availability. Largemouth Bass typically mature at about ages 1 to 2 in the region
(Carlander 1977; Rohde et al. 1994), or when they reach approximately 10 inches long (Pitlo et al. 2004).
• Alabama Bass
Alabama Bass were once thought to be a subspecies of Spotted bass (M. punctulatus). Morphological
characteristics and DNA analyses revealed that was not the case and taxonomic revision was necessary
(Rider et al. 2015). The natural range of the Alabama Bass is the Mobile River basin of Alabama, Georgia,
and Mississippi. Illegal introductions by anglers were made in basins in South Carolina, North Carolina,
and Tennessee. Unlike Largemouth Bass that thrive in shallow turbid reservoirs Alabama Bass prefer
clear reservoirs with rocky substrate.
Although little has been described we assume young males construct nests in shallow littoral areas
(Rider et al. 2015). Spawning occurs in late spring, typically April. Males then guard the fry for a short
period of time. It is reported that fecundity of Alabama Bass is less than Largemouth Bass ranging from
1,500 to 7,200 eggs.
36

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
4.4 Identification and Evaluation of Primary Growth Period
[§122.21(r)(4)(iv))
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 and 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).
Fish reproduction for the species in Lake Julian occurs via external fertilization', which is principally
controlled by water temperatures. Fish reproduction has the potential to produce high yields; however,
mortality rates can also be high compared to other organisms. Additionally, a majority of fish spawn only
once a year regardless of prior success. Fecundity, the number of eggs a female produces, can vary
depending on the life history of the species. Species -specific spawning information is summarized in
Section 4.4 of this report (Seasonal and Daily Activities of Organisms in the Vicinity of the CWIS).
Monitoring data collected on Lake Julian indicate the presence of multiple size classes indicating good
reproductive success.
Generally, larval recruitment to the juvenile life stage in North Carolina begins in November and
continues until April or May, depending on the life history strategy of individual species (Page and Burr
2011). As a result, peak larval fish entrainment also commonly occurs during the period immediately
prior to larval recruitment to the juvenile or young -of -year stage. During this period, the smaller larval
stage fish are less adept at maintaining their position in currents compared to larger fish and are more
susceptible to entrainment.
The majority of the native fish species present in Lake Julian are nest builders; the eggs remain in the
nest and newly hatched larvae do not travel far from the nest. Others are broadcast spawners with
demersal and adhesive eggs that stick to the substrate.
4.4.1 Period of Peak Abundance for Relevant Taxa
Fish spawning is a direct function of water temperature, and most activity is constrained to the spring
and early summer months. As a result, an influx of egg, larval, and juvenile fishes occur in Lake Julian
each year when water temperatures begin to rise. Under ACC operations, spawning is anticipated to
initiate around March or April. As such, peak abundance for most early life stages and juvenile fishes in
9 The release of both sperm and egg outside of an organism is defined as external fertilization.
37

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
Lake Julian is expected to occur between April and June depending on each species' unique spawning
habitats, as presented in Table 4-2.
Table 4-3. Known Spawning and Recruitment Period of select Species with Documented Occurrence in Lake
Julian, North Carolina (Sources: Rider et al. 2015; Rohde et al. 1994; Rohde et al. 2009; Etnier and Starnes 1993)
Name
Common Name Jan Feb
Mar Apr May Jun
Jul Aug Sep Oct Nov Dec
Black Crappie
Bluegill
Green Sunfish
Largemouth
Bass
Largemouth X
Centrarchidae
Alabama Bass
Hybrid
Redbreast
Sunfish
Redear Sunfish
Alabama Bass
Warmouth
■
Gizzard Shad
Clupeidae
Threadfin Shad
Goldfish
Cyprinidae
Grass Carp
Brown Bullhead
Ictaluridae
Channel Catfish
Flat Bullhead
Poeciliidae
Eastern
Mosquitofish
■
® Gray -shaded months indicate the known spawning Darker -shaded months
and recruitment period. indicates period of potential
■
peak abundance.
Note: The data presented here represent the spawning and recruitment windows that are typical of the region and that are
anticipated for Lake Julian after operations of ACC begin.
38

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
4.5 Data Representative of Seasonal and Daily Activities of
Organisms in the Vicinity of CWIS [§122.21(r)(4)(v)]
There are no diadromous fish species in Lake Julian. Most species undergo short or local migrations for
spawning and/or overwintering. Table 4-3 summarizes seasonal (i.e., spawning) and daily (i.e., feeding
and habitat preference) activities for species observed in Lake Julian.
Table 4-4. Seasonal and Daily Activities of select Species Present in Lake Julian (Sources: Rider et al. 2015; Rohde
et al. 2009; Rohde et al. 1994; Etnier and Starnes 1993)
Species
(Common Name)
Seasonal Activities/Spawning Migration
Daily Activities/Daily Migration/Habitat
Centrarchidae
Usually found in vegetated areas of backwaters in streams
Spawning occurs from late February to early May.
and rivers in ponds and reservoirs. Prefer clearer and cooler
Black Crappie
Nests are constructed in shallow water sometimes in
waters than White Crappie. Young Black Crappie feed on
close proximity to each other.
aquatic insects and small fishes and adults feed primarily on
fishes.
Tolerant of many conditions and utilize most of the habitats
Spawning occurs from May through the end of
available to the species in North Carolina. Natural habitats
Bluegill
summer (typically August) with a peak generally in
are pools in creeks and rivers, swamps, oxbow lakes,
June. Colonies of nests are constructed by males in
impoundments, and ponds, with cover of vegetation,
shallow water areas on variable substrates.
submerged wood, or rocks. Their diet consists of aquatic
insects, small fishes, and crayfishes.
Prefer slow pools and backwaters of low- and moderate
Spawning occurs from April through August. Colonies
gradient streams and rivers, but also occur in ponds, lakes,
Green Sunfish
of nests are almost always constructed near shelter
and reservoirs. Highly tolerant of conditions such as turbidity
such as a log or clump of vegetation.
and drought and can rapidly colonize new habitats. Food
preferences are aquatic insects and small fishes.
Spawning occurs late April to June. Nests are
Largemouth Bass generally located in sand or gravel at the base of logs,
stumps, and emergent vegetation along shorelines.
Spawning generally occurs from late May through the
end of July, with a peak in June. Nests are larger
Redbreast Sunfish saucer -shaped depressions swept out in a substrate
of coarse sand and gravel and typically made in
shallow water.
Occupy a wide variety of habitats. Prefer warm, calm, and
clear water and thrive in slow streams, farm ponds, lakes,
and reservoirs. Adults feed on fishes, frogs, and almost any
other animal of appropriate size.
Typically found in pools and backwaters of streams and rivers
of low to moderate gradient where the species is usually
associated with woody debris, stumps, and undercut banks.
Preferred foods include terrestrial insects, aquatic insects,
small clams, and fishes.
Spawning generally occurs from late spring to early Found in a variety of habitats in ponds, lakes, reservoirs,
swamps, sluggish streams, small rivers, and backwaters often
Redear Sunfish summer. Nests are constructed in colonies in shallow
in or near vegetation and over a mud or sand bottom. Prefer
waters. to feed on hard invertebrates such as snails and small clams.
Spawning occurs in late spring, typically April. The
Alabama Bass males construct nests in littoral areas and guard fry
for a short time.
Spawning occurs from late spring through mid-
Warmouth summer. Males construct solitary, circular nests in
silty debris usually associated with some type of
cover in shallow water.
Cichlidae
Blue Tilapia 1 Young develop inside of female
Prefer reservoirs and medium to larger streams and rivers.
Often inhabit deeper water and found on rocky points and
bluffs. Primarily piscivorous but a large portion of their diet
comprised of crayfishes.
Prefer sluggish or still waters of streams, swamps, bays, and
reservoirs, especially in shallow and well vegetated areas.
They eat only crayfishes and insects.
Nest builders
39

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
Species
Seasonal Activities/Spawning Migration
Daily Activities/Daily Migration/Habitat
(Common Name)
Clupeidae
Spawning occurs in the spring, from March through
Inhabit fresh and saltwater ecosystems. In freshwater
Alewife
May, usually near the surface and in large
landlocked systems (like Lake Julian), Alewife school in
pelagic regions of the waterbody following prey, primarily
aggregations.
zooplankton.
Inhabit lakes, ponds, pools, and backwaters of low -gradient
Spawning occurs in the spring and summer, from
streams. Gizzard Shad are filter feeders, consuming
Gizzard Shad
March through August, usually near the surface and
copepods, cladocerans, phytoplankton and zooplankton.
in large aggregations.
Feeding activity is highest during the day with minimal
activity at night.
Spawning occurs in aggregations at near surface
Inhabit a variety of habitats but is considered a pelagic
Threadfin Shad
depths often over structure. Eggs are demersal and
schooling fish. Filter feeders that strain the plankton from the
adhere to vegetation and brush.
mid -water column, open water.
Cyprinidae
Spawning occurs in the spring and summer. Adhesive
This benthic species is commonly found in still water of lakes,
Goldfish
eggs are scattered.
reservoirs, ponds, rivers, and quite streams dominated by
vegetation. It tolerant clear or turbid waters.
During spawning season, Grass Carp will migrate up
Found in quiet or slow -moving waters, in ponds, lakes, pools,
Grass Carp
rivers. They typically lay eggs over shoals and a large
and backwaters of larger rivers. Young are known to eat
female can produce more than a million eggs.
small invertebrates and microcrustaceans while adults are
omnivorous.
Ictaluridae
Occur over soft substrates in pools, slow -moving creeks, and
Brown Bullhead
Spawning begins in April and May and continues into
any -sized rivers and in various lentic habitats. They are
late summer; adults build circular, shallow nests.
bottom feeders with a wide variety of diet consisting of
crustaceans, insects, worms, algae, mollusks, and fishes.
Channel Catfish Spawning begins in April and May and continues into
early summer.
Flat Bullhead Spawning occurs in June and July, at water
temperatures of 21-24'C.
Loricariidae
Inhabit a wide range of habitats from small to large creeks,
rivers, reservoirs, and ponds. The species can occur over a
range of substrates. The young feed on plankton and aquatic
insect larvae while juveniles and adults prefer crayfishes,
mollusks, immature mayflies, and caddisflies.
Occupy a variety of habitats. Adults are more common in
slow areas of rivers with a mud or sand bottom and organic
debris. The young frequently inhabit smaller, clearer streams.
Prefer aquatic insects, small fishes, and snails.
Amazon Sailfin Introduced species that excavates riverbanks to
Catfish create burrows in which an attracted female will lay Feeds on algae, benthic organisms, and detritus.
and guard her eggs.
1 Likely not currently present within Lake Julian due to the reduced discharge of heat.
Water column migration or diel vertical migration in Lake Julian is typical for fish species that inhabit
lacustrine environments. During a daily cycle, zooplankton and fish exhibit synchronized movements up
and down in the water column and this movement is referred to as diel vertical migration (Brierley
2014). Diel vertical migration in freshwater fish is primarily triggered by the diel change in light intensity,
with declining illumination at dusk triggering the ascent to the surface and increasing illumination at
dawn triggering the descent back to deeper water (Mehner 2012). This is the typical pattern for many
species; however, reverse migration can also occur. Additional triggers for vertical migration include
hydrostatic pressure and water temperature, which may guide fish into particular water layers at night
40

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
(Mehner 2012). Pelagic (open water) organisms use diel vertical migration to balance the competing
objectives of growing quickly and minimizing predation risk. In fish species that perform diel vertical
migration, there are two similar ecological traits: 1) they are planktivorous; and 2) they require cold or
cool water and live primarily in the pelagic zone of deep, thermally stratified lakes (Mehner 2012). In
Lake Julian, diel vertical migration can be considered characteristic of many freshwater fish species,
particularly juveniles or species that are small in adulthood.
4.6 Identification of Threatened, Endangered, and Other Protected
Species Susceptible to Impingement and Entrainment at CWIS
[§122.21(r)(4)(vi)]
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 Lake Julian.
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 Lake Julian. The USFWS' 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 Lake Julian. The North Carolina Natural Heritage Program
was consulted for state -protected species. Because the ACC is located 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 RTE aquatic species or critical habitat designations for Buncombe County, North
Carolina, are provided in Table 4-5. 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 Endangered Species Act.
Table 4-5. Rare, Threatened, or Endangered (RTE) Aquatic Species Listed for Buncombe County, North Carolina,
and Record of Occurrence or Potential to Occur in Lake Julian
Scientific
Name
Common
Name
Status*
Record of occurrences or potential to occur in Lake Julian
Polyodon
FSC,
No record of occurrence in Lake Julian.
athula s
P
Paddlefish
SE
Very low - believed extirpated from the region, never collected in
electrofishing samples taken near the CWIS
Erimonax
Spotfin
No record of occurrence in Lake Julian.
monachus
Chub
FT, ST
Very low - believed extirpated from the region, never collected in
electrofishing samples taken near the CWIS
41

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
Scientific Common
Status" Record of occurrences or potential to occur in Lake Julian
Name Name
No record of occurrence in Lake Julian.
Very low - occurs in lotic habitat (riverine), never documented in
Alasmidonta Appalachian
FE, SE Lake Julian and host fish not documented in Lake Julian; not
raveneliana Elktoe
io
collected in recent survey of French Broad River (Alderman 201510,
NCDNCR 2022)
No record of occurrence in Lake Julian.
Very low - occurs in lotic habitat (riverine), never documented in
Fusconaia
Longsolid
SE Lake Julian and host fish not documented in Lake Julian; not
subrotunda
collected in recent survey of French Broad River (Alderman 2015,
NCDNCR 2022)
No record of occurrence in Lake Julian.
Very low - occurs in lotic habitat (riverine), never documented in
Lake Julian; not collected in recent survey of French Broad River
Strophitus
(Alderman 2015). Although host fish species (which may include
ST
undulatus Creeper
Green Sunfish, Creek Chub, Channel Catfish, Largemouth Bass,
Black bullhead (Ameiurus melas), Yellow Perch (Perca flavescens),
and Spotfin Shiner (Cyprinella spiloptera) exist, the general habitat
of Lake Julian would be unsuitable (NCDNCR 2022)
*Status: FE- federal endangered, FT -federal threatened, FSC- federal species of concern, SE - state endangered, ST-
state threatened.
The following materials were reviewed to develop the species list in Table 4-5:
• IPAC (https://ecos.fws.gov/ipac/) (USFWS 2022) for the search area shown on Figure 4-2, and
North Carolina Department of Natural and Cultural Resources (NCDNCR) Natural Heritage
Program (http://www.ncnhp.org/data/species-community-search) (topographic maps used:
Skyland, NC) (NCDNCR 2022).
Historical electrofishing results for Lake Julian are discussed in Section 4.1 of this report. No federally or
state -listed species were collected during the historical electrofishing sampling of Lake Julian.
Several factors will contribute to the protective nature of the ACC's cooling system toward aquatic
species, such as closed -cycle cooling (BTA), a CWIS design and TSV below 0.5 fps, and the minimal
amount of make-up water withdrawn from Lake Julian in support of the ACC units. The repurposed Lake
Julian CWIS uses fixed mesh screen panels with a TSV of much less than 0.5 fps, resulting in a negligible
potential for impingement.
Operating as a CCRS substantially reduces intake volume and is also reflected in the Rule as an
impingement mortality BTA. In addition, the ACC's closed -cycle configuration is compliant with
§125.94(e)(1) for entrainment BTA for new units at existing facilities.
io Results of a 2015 mussel survey performed in the upstream and downstream vicinity of the Asheville Plant river
intake structure on the French Broad River did not collect any specimens federal or state -listed mussels
(Alderman 2015).
42

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
4.7 Documentation of Consultation with Services
[§ 122.21(r) (4) (vi i )]
In preparing this response package for compliance with the Rule, there has been neither public
participation, nor coordination undertaken with the Services. DEP has not submitted information to
obtain incidental take exemption or authorization from the Services.
4.8 Methods and QA Procedures for Field Efforts
[§122.21(r)(4)(viii)]
Data presented in this report were compiled from DEP's historical and ongoing Environmental
Monitoring Program on Lake Julian. Copies of reference documents will be made available upon request.
4.9 Definition of Source Water Baseline Biological Characterization
Data [§122.21(r)(4)(ix)]
Data presented in this report were compiled from Duke Energy's historic and ongoing Environmental
Monitoring Program.
4.10 Identification of Protective Measures and Stabilization
Activities [§122.21(r)(4)(x)]
DEP has performed habitat improvements in Lake Julian to provide additional cover for juvenile and
small fishes and to increase angling success by recreational users. During March 2010, an artificial
concrete reef was constructed in approximately 25 feet of water on the north side of Lake Julian, east of
the planned ACC footprint (Figure 2-2). In June of 2017, discarded Christmas trees were added to the
artificial reef to improve the fishery habitat within the lake and provide additional fish attraction areas,
away from the facility, for shoreline and boat anglers (DEP 2022b). Additional shoreline habitat
enhancement efforts (1998 and 2002) have included the felling and cabling of trees along targeted
sections of shoreline (Progress Energy 2013).
The design of the ACC cooling water system (i.e., use of closed -cycle cooling) and the cooling water
intake (i.e., TSV less than 0.5 fps) are anticipated to minimize impingement and greatly reduce
entrainment.
4.11 List of Fragile Species [§122.21(r)(4)(xi)]
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 Lake Julian was evaluated using historical sampling
data and is summarized in Table 4-6.
43

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
Table 4-6. List of Fragile Species as Defined by the EPA and their Occurrence in Lake Julian and/or the French
Broad River near Asheville Combined Cycle Station
Scientific Name Common Name Occurrence in Lake Julian in vicinity of
ACC CWIS*
Alosa pseudoharengus
Alewife
Yes
Alosa sopidissima
American Shad
No
Clupea harengus
Atlantic Herring
No
Anchoa mitchilli
Bay Anchovy
No
Alosa aestivalis
Blueback Herring
No
Pomatomus saltatrix
Bluefish
No
Poronotus triacanthus
Butterfish
No
Dorosoma cepedianum*
Gizzard Shad
Yes
Dorosomo petenense*
Threadfin Shad
Yes
Lutjanus griseus
Grey Snapper
No
Alosa mediocris
Hickory Shad
No
Brevoortia tyrannus
Atlantic Menhaden No
Osmerus mordox
Rainbow Smelt No
Etrumeussadina
Round Herring No
Engraulis eurystole
Silver Anchovy No
*Threadfin Shad is not included on the EPA Fragile Species list; however, it is in the same family as
Gizzard Shad and is documented as having a post -impingement survival rate of less than 30 percent.
Alewife and Gizzard Shad were the only species from the list that have been documented in Lake Julian.
Threadfin Shad, a closely related species expected to have very low post -impingement survival, have
also been documented in electrofishing surveys performed on Lake Julian. Threadfin Shad, Gizzard Shad,
and Alewife typically exhibit a greater likelihood for entrainment and impingement at CWIS due to
reproductive habits, habitat preferences, and sensitivity to temperature extremes. Mass die -offs of shad
species have been documented in response to extreme winter temperatures (at or below 9°C) resulting
in large collection events at CWIS (Loar et al. 1978, Griffith 2011). Shad in Lake Julian may experience
die -offs during winter months in response to the loss of thermal discharges that have occurred with ACC
operations.
The facility is fully compliant with BTA alternative §125.94(e). Note however, that the repurposed CWIS
has fixed mesh screen panels with a TSV substantially less than 0.5 fps and impingement is anticipated
to be negligible at this facility based on the low TSV; therefore, a discussion or assessment of potential
fragile species is not provided in this report.
44

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
4.12 Information Submitted to Obtain Incidental Take Exemption or
Authorization from Services [§122.21(r)(4)(xii)]
DEP has not submitted information to obtain incidental take exemption or authorization from the
Services; nor is such an exemption necessary based on the ACC technology to be employed and the lack
of any relevant species in Lake Julian.
45

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
5 Cooling Water System Data [§122.21(r)(5)]
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 ACC utilizes a closed -cycle circulating water system to supply cooling water to the steam surface
condenser and auxiliary cooling system to remove heat from the combined cycle unit steam turbine. The
circulating water system also provides station service water (e.g., fire water and HRSG wash water). A
water balance diagram showing flow distribution at the facility (e.g., cooling water and service water
systems) is provided in Figure 5-1 and Table 5-1 presents the average annual and maximum design flows
(developed by CB&I North Carolina, Inc. [CB&I]) for the ACC.
Raw water pumped from submersible pumps at the repurposed CWIS supplies make-up water to the
recirculating cooling towers and other plant needs for the ACC (Units 05/06 and 07/08). Each unit
consists of a dual fuel (natural gas/fuel oil) combustion turbine combined with an HRSG that captures
the exhaust heat from the combustion turbine unit, generates steam, and delivers the steam to a steam
turbine to generate additional power. Each unit is also equipped with a mechanical draft cooling tower.
Each cooling tower has five main components: 1) the fans which direct the airflow upward, 2) the heat
transfer section made up of corrugated polyvinyl chloride sheets commonly called the "fill", 3) the water
distribution system, 4) the drift eliminator section, and 5) the concrete basin which collects water to
return to the condensers and auxiliaries. Each of the 50-foot-tall ACC towers consists of four cells, four
200-horsepower fans (one per cell), a 3-pass drift eliminator, and have a total circulating water flow of
65,106 gpm.
46

316(b) Compliance Submittal Requirements
Asheville Combined Cycle Station
Heated water from each unit's condenser cooling system is routed to the cooling tower via circulating
water piping. The heated circulating water is cooled by the cooling tower, collected in a basin beneath
the tower, and pumped back to the condenser cooling system where the cycle is repeated. The
recirculating cooling water system is designed to operate at 10 COC during typical operations, meaning
the circulating water constituents concentrate approximately 10 times or more during operation.
The heat transferred to the circulating water in the condenser is rejected to the atmosphere by
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 control the COC by continuously discharging 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 the wastewater pump, and discharged to the French Broad
River via Outfall 001.
47

4 Ultrafiltration $ '10 -16
Backwash Strainer Se Water/Fire Service Bip,,,�„r
and uttraf[Itration Water Tank C
ater Users Drains Sump
skids
5 17 Existing Simple Cycle E)astirg Savle C
Evap Cooling & Storrnwaier Dramas
Makeupand lift stalson i
Unit 07/06 Raw 38 38
Water Supply Standby ROIDemin
Trailers
Simple C) 12
Cycle CTG Two -Pass Reverse 3 15 1$
Water Mixed -Bed Derninefalized
Infection Osmosis Deriinefalizer Water Tanks CTG
Injecti<
Atmosphere 14
Evaporationj — —�j H %
72,
20 f--/222,1 19
i Cooling Tower&SG Blowdown HRSGBasinank/SumpOF Backwash Sump CTG Wash
(Shared) 30 24 Water Trans
27 Sample 19
3.1 Panel
34
2 $ 32 Oil -Water Unit 7/8 TE
Separator WTB drain
Sludge Side -stream Filter sips Unit 07108
Thider�r (t per Backwash Sump - F11Len tl p� Cooling Tower
pancr Clock) (1 per power pova r block) Slowdown 39) Oil -water U
nloc 25 Separator di
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(3ttsrea) Cooling Tower Wastewater Sump Sing
&owdown (Shared) Basin! FI CIIC�
2y
39 20 Chanel 4.1 putfall
Transfer Tm" 40
Existing
Fuel Oil Existing Fuel Oil Post ash basin
Area Oil -Water closure surfaced
Stormwater Separator groundwater Process Flow Diagrar
Progress, LLC
Asheville Combined C

[This page intentionally left blank]

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
Table 5-1. Water Balance Associated Flows for the ACC
Duke Energy Progress, Inc.
Asheville Combined Cycle Plant — NPDES Permit Number NCO000396
Form 2C - Item 2.1-A Flow, Sources of Pollution, and Treatment Technologies
Stream
Name
Average Flow
Comments
1
Total Facility Raw Water Supply
3.294 MGD
Lake Julian
2
Raw Water to Unit 05/06
1.647 MGD
Average
3
Raw Water to Unit 07/08
1.647 MGD
Average
4
Raw Water to Ultrafiltration
0.160 MGD
Estimated
5
Cooling Tower Makeup
1.335MGD
Estimated
6
Caoling Tower Evaporation and Drift
0.921 MGD
Estimated
8
Raw Water to Service Water Tank
0.151 MGD
Estimated
9
Uitrafiltration Reject & Strainer Backwash
0.021 MGD
Estimated
10
Service Water to Users
0.072 MGD
Estimated
11
Condenser Circ Water Quench Water to
Boiler Blowdown Tank
0.006 MGD
Estimated
12
Service Water to Two -Pass Reverse Osmosis
Skids
0.148 MGD
Estimated
13
Reverse Osmosis Permeate to Mixed Bed
Demineralizer
0.108 MGD
Estimated
14
Reverse Osmosis Reject
0.040 MGD
Estimated
15
De mineralized Water System Makeup
0.108 MGD
Estimated
16
Service Water Users to Oil Water Separator
0.072 MGD
Estimated
17
Service Water to Unit 3 & 4 Evaporative
Cooling & Cycle Makeup
0.090 MGD
Estimated Seasonal
18
CTG NOx Injection Water
0.255 MGD
Estimated
19
CTG Wash Water
0.001 MGD
Episodic
20 1
Boiler Makeup
0.016 MGD
Estimated
21
Boiler Blowdown
0.007 MGD
Estimated
22
Boiler Blowdown Tank Evaporation & Losses
0.003 MGD
Estimated
23 1
Quenched Boiler Blowdown Sump Flow
0.019 MGD
Estimated
24
Sam le Panel Flow
0.009 MGD
Estimated
25
Unit 05/06 Oil Water Separator Flow 1
0.072 MGD I
Estimated
50

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
Duke Energy Progress, Inc.
Asheville Combined Cycle Plant— NPDES Permit Number NCO000396
Form 2C - Item 2.1-A Flow, Sources of Pollution, and Treatment Technologies
Stream
Name
Average Flow
Comments
26
Total Facility Wastewater to Plant Discharge
0.677 MGD
Estimated
27
Side -Stream Filter Flow (Circulating water)
2.753 MGD
Estimated
28
Side -Stream Filter Backwash Flow
0.0244 MGD
Estimated
29
Sludge to Transfer Truck
0.009 MGD
Episodic
30
OF Backwash Sump discharge flow
0.050 MGD
Estimated
31
Side -Stream Filtrate (Circ water return)
2.390 MGD
Estimated
32
Unit 07/08/WTB Oil water separator Flow
0.114 MGD
Estimated
34
Filter Press Supernatant
0.001 MGD
Estimated
37
Sludge Filter Press Supernatant
0.001 MGD
Estimated
38
StandbV Demin Trailer Flow
0.164 MGD
Estimated
39
Cooling Tower Blowdown ( per unit)
0.338 MGD
Average
40
Post ash basin surfaced jzroundwater
0.02.9 MGD
Estimated
41
Outfall 001
0.706 MGD
Estimated
42
Outfall 002
0.080 MGD
Estimated Seasonal
5.1.1 Temporal Characteristics of Cooling Water System Operation
The cooling water system design incorporates two operating scenarios; Average Annual Design and
Maximum Flow Design (see Table 5-1). Average Annual Design assumes the ACC would operate using
natural gas as the fuel source and operate the cooling towers at 10 COC. This design scenario represents
typical or normal operations. The Maximum Flow Design scenario assumes the ACC would operate using
fuel oil with 5 COC at the cooling towers. This operating scenario is considered to be a relatively
infrequent event, for example, upon startup commissioning and during periods of natural gas
curtailment.
5.1.2 Proportion of Design Flow Used in the Cooling Water System
As illustrated in the water balance diagram provided on Figure 5-1, an average of 71 gpm per unit will be
used for service water (see Stream #7: raw water to ultrafiltration inlet). Therefore, based on the design
pumping capacity of 1,800 gpm per unit, approximately 3.9 percent of the raw water coming into ACC is
used for service water; the remaining 96.1 percent is used for cooling purposes.
51

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
Based on the AIF of 2.3 MGD (1,597 gpm) presented in Table 3-5, approximately 8.9 percent (71 gpm x 2
units / 1,597 gpm) of the raw water coming into ACC will be used for service water; the remaining 91.1
percent will be used for cooling purposes.
5.1.3 Distribution of Water Reuse
The ACC units do not reuse cooling water as process water, reuse process water for cooling purposes, or
use grey water for cooling purposes. Therefore, this subsection is not applicable to the ACC units.
5.1.4 Description of Reductions in Total Water Withdrawals
The retirement of the Asheville Plant's Units 1 and 2 and replacement with new combined cycle units
utilizing a closed -cycle recirculating cooling system has resulted in reductions in total water withdrawals
at the Lake Julian CWIS for ACC operations. Conversion of the existing once -through operations to the
new combined cycle operations decreases the DIF capacity from 316.2 MGD (i.e., 2 pumps at 48,300
gpm + 2 pumps 61,500 gpm = 219,600 gpm) to 5.2 MGD (i.e., 2 pumps at 1,800 gpm = 3,600 gpm) for a
net reduction of 311 MGD, or 98.4 percent. Actual withdrawals are approximately 2.3 MGD on an
average annual basis, which would result in a 99 percent reduction in total water withdrawals at the
CWIS.
5.1.5 Description of Cooling Water Used in Manufacturing Process
Cooling water from the ACC is not used in a manufacturing process, either before or after the water is
used for cooling; therefore, this subsection is not applicable to the ACC.
5.1.6 Proportion of Source Waterbody Withdrawn
The Lake Julian water surface elevation is dependent on rainfall runoff, natural evaporation, seepage
through the dam, and withdrawals to support plant operations. Water from the French Broad River can
also be pumped to Lake Julian to support pond elevations. At the normal lake elevation of 2,161 ft msl,
Lake Julian's storage capacity is 8,819 acre-feet (2,874 million gallons) (WSP 2015). To determine the
proportion of water withdrawn from Lake Julian on a monthly -average basis, the estimated average
withdrawal volume needed to support ACC operations was divided by the total capacity of Lake Julian at
the normal lake elevation. The proportion of Lake Julian withdrawn for cooling purposes by the ACC
plant is approximately 2.4 percent based on an AIF of 2.3 MGD.
5.2 Design and Engineering Calculations [§122.21(r)(5)(ii)]
Engineering calculations of TSV for the %-inch mesh fixed screen panels are provided in Appendix C.
Table 5.2 Calculated TSV
Calculated TSV (fps)
One Raw Water Pump 0.09
Two Raw Water Pumps 0.18
52

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
5.3 Description of Existing Impingement and Entrainment
Reduction Measures [§122.21(r)(5)(iii)]
Substantial reductions in rates of impingement for the ACC compared to the existing Asheville Plant are
accomplished through a TSV of less than 0.5 fps. The TSV calculated for the Lake Julian CWIS for Unit
05/06 and Unit 07/08 meet the BTA standard for new units at an existing facility at §125.94(e).
The ACC facility also 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 are conveyed passively with water entering the power plant. Therefore, reduction in flow
results in a commensurate reduction in entrainment". Reduction in flow will be accomplished by
retiring Units 1 and 2. The two new natural gas -fired combined cycle units reduce the DIF at the Lake
Julian CWIS by approximately 98.4 percent (as discussed in Section 5.1.4).
5.3.1 Asheville Plant
The retirement of existing Unit 1 and Unit 2, coupled with startup of the new ACC units, the total facility
DIF has been reduced by approximately 98.4 percent (from 316.2 MGD to 5.2 MGD). This flow reduction
results in a commensurate reduction in the potential entrainment and impingement associated with the
facility.
5.3.2 The ACC
The ACC is compliant with §125.94(e) BTA standards for impingement mortality and entrainment for
new units at existing facilities by use of mechanical draft cooling towers which reduce the DIF for the
new unit to a level commensurate with a CCRS. The ACC employs the following supplemental measures
to reduce impingement mortality and entrainment at the CWIS on Lake Julian:
• TSV (provided in Section 2.3) at the Lake Julian CWIS is substantially less than 0.5 fps.
• Because the AIF (2.3 MGD) at the Lake Julian CWIS represents a greater than 95 percent
reduction in withdrawal rates and the facility -induced TSV at the intake is less than 0.5 fps
(regulatory threshold), the A01 for the Lake Julian CWIS's does not extend beyond the surface of
the intake screens.
• The ACC employs a closed -cycle recirculating cooling water system by utilizing wet mechanical
draft cooling towers designed to reduce make-up water requirements. While the number of
COCs can change depending on operational conditions, an estimated 10 COC provides a flow
reduction of 98.4 percent compared to a once -through system. Since reductions in impingement
and entrainment can be assumed to be commensurate with reductions in flow, it is assumed
that the use of closed -cycle cooling at the ACC will reduce impingement and entrainment by
98.4 percent.
"This is the underlying assumption in EPA's calculation of entrainment reduction associated with closed -cycle
cooling —see EPA 2014.
53

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
In addition to the design aspects and operations of the ACC facility, the following are also important
considerations in determining BTA standards for impingement mortality and entrainment:
• The ACC withdraws water from Lake Julian; a cooling pond (impoundment) permitted and
constructed in part on WOTUS for the purpose of providing cooling for electric generation
(North Carolina State Board of Health 1963). All of the species identified as potentially subject to
entrainment are common to the region.
• The species found to have a higher likelihood of entrainment at Lake Julian (Threadfin Shad and
Gizzard Shad) comprise a low relative abundance of fish sampled through electrofishing surveys
(between 0 and 7.7 percent). As described in Section 4.2, electrofishing studies indicate Lake
Julian exhibits a balanced fish community. This suggests Lake Julian contains a sufficient
foundation of reproduction, recruitment, and mortality for sustainable predator populations
and prey base. Further, Lake Julian supports an active recreational fishery.
• No federally listed fish species or critical habitat designations exist within Lake Julian near the
CWIS (USFWS 2017).
As outlined above and in the section that follows, the operations of the ACC facility reduce impingement
mortality and entrainment such that no additional control measures are necessary.
5.3.3 Best Technology Available for Entrainment
Although the ACC closed -cycle cooling system is compliant with the BTA requirement for new units at an
existing facility (§125.94(e)), the following information is provided to support the conclusion that the
retirement of the existing Asheville Plant and operation of the new ACC units has resulted substantial
entrainment reduction.
The number of organisms that may be entrained is considered to be low. Since entrainment is
proportional to flow, reductions in flow equate to commensurate reductions in entrainment. The
retirement of Units 1 and 2 reduced the DIF by 98.4 percent (from 316.2 MGD to 5.2 MGD). As a result
of the flow -reduction measures, AIF is 2.3 MGD at the ACC.
No federally or state -protected species were collected in previous electrofishing sampling on Lake Julian.
In addition, according to the USFWS IPAC database, there are neither protected species nor critical
habitat designations for Lake Julian (USFWS 2017).
54

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
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.
55

Clean Water Act §316(b) Compliance Submittal
Asheville 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 new ACC units are equipped with a CCRS using mechanical draft cooling towers. A closed -cycle
recirculating system satisfies the impingement mortality and entrainment BTA standards for new units
at §125.94(e).
6.1 Design TSV
It is recognized by the EPA that an intake TSV of 0.5 fps or less establishes a threshold based on the
assumption that, at velocities below this value, most healthy impingeable-sized fishes will be able to
swim freely and avoid impingement.
The ACC cooling tower make-up water is withdrawn at the repurposed Lake Julian CWIS, which is
comprised of four identical intake bays. Each bay will be equipped with a new (replacement for historic)
submersible pump with a design capacity of approximately 1,800 gallons per minute (gpm) (2.6 MGD).
The ACC units are designed to operate with two pumps (the remaining two pumps provide redundant
pumping capacity). As a result, the combined DIF capacity for the ACC units is 3,600 gpm (5.2 MGD).
The average TSV based on the new Y4-inch mesh screens is 0.09 fps (at low water surface elevation) and
the max TSV is 0.18 fps (at low water surface elevation). At DIF the average TSV for new %-inch mesh
screens for both units (at low water surface elevations) is lower than the 0.5 fps threshold established
by the Rule. As such, the impingement AOI at the ACC is negligible because the area over which the
intake -induced velocity is greater than 0.5 fps would not extend beyond the face of the screens. The ACC
TSV (which is lower than the 0.5 fps threshold established for impingement BTA) would protect greater
than 96 percent of fish from impingement at the CWIS on Lake Julian based on the Rule's Technical
Development Document.
6.2 Requirements of Make-up Water Minimization for Closed -Cycle
Recirculating System
According to the Rule at §125.92, a CCRS is "...designed and properly operated using minimized make-up
and blowdown flows withdrawn from a water of the United States to support contact or non -contact
cooling uses within a facility...". A CCRS withdraws significantly less water from its source water body
than a once -through cooling system. The actual reduction in withdrawal volume depends on the design
and operation of the recirculating cooling system. The site -specific design and operating parameters of
the closed -cycle cooling system at ACC are presented in Table 6-1.
56

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
Table 6-1. Site -Specific Design of ACC Closed -Cycle Cooling System (CB&I 2018)
Design and Operational Parameters Values
Condenser cooling water flow and The cooling towers for ACC are designed to cool 65,106 gpm
condenser temperature rise (i.e., delta T) with a temperature range of 17.70 Fahrenheit (°F) (-7.940C).
COC at which the cooling tower is The circulating water system is currently expected to operate
typically operated at 10 COC.
Drift eliminator efficiency Drift loss (% of cooling water flow) is estimated to be 0.0005
percent.
The design MW rating of ACC is 560 MW (2 power blocks at
MW rating of ACC generating blocks 280 MW each). The summer/winter net electrical generating
capacity of each block is estimated at 250 MW / 280 MW.
Evaporation, drift, and blowdown rates are compiled and summed to determine volume of make-up
water withdrawn at the CWIS:
where:
Make-up flow = Evaporation (E) + Drift (D) + Blowdown (B)
E = 0.0008 x Condenser temperature delta T (°F) x Condenser CW flow rate (gpm)
D = Drift eliminator efficiency x Condenser cooling water flow (gpm)
B = [E-((COC-1) x D1]/(COC-1)
Then, make-up flow is compared with condenser cooling water flow (i.e., once -through flow) to
determine the degree of flow reduction.
Using the cooling tower flow of 65,106 gpm, delta T of 17.7°F (-7.94°C), drift eliminator efficiency of
0.0005 percent and 10 COC (CB&I 2018), the calculations for evaporation, drift, and blowdown rates are
as follows:
E=0.0008x17.7°Fx65,106gpm =921.9gpm
D=0.0005x65,106gpm =32.6gpm
B = [921.9 — 1(10-1) x 32.61]/(10-1) = 69.8 gpm
Make-up Flow for 10 COC = 921.9 + 32.6 + 69.8 = 1,024.3 gpm
Therefore, the calculated total ACC make-up water flow12 for 10 COC is 1,024.3 gpm (1.48 MGD). As a
result, the percent flow reduction compared to a once -through cooling system is 98.4 percent ([65,106-
1,024.31/65,106 X 100).
DEP anticipates that the make-up water flow to the cooling towers installed at ACC will continue to be
minimized to the maximum extent possible within the constraints of practicality, scaling, other
operational issues, and the need to comply with NPDES discharge limits.
12 Based on CB&I Document No. ACC00-SP-M-CW-01; represents the total designed capacity for the cooling
towers.
57

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
7 Entrainment Performance Studies [40 CFR §
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 [40 CFR §122.21(r)(7)(i)]
Site -specific entrainment has not been evaluated for ACC. Site -specific studies are neither required by
the Rule nor relevant to the ACC because the facility meets the entrainment BTA standards for new
units.
7.2 Studies Conducted at Other Locations [40 CFR §122.21(r)(7)(ii)]
As of the date of this report, no entrainment performance studies conducted at other facilities have
been determined relevant for documentation in this section.
58

Clean Water Act §316(b) Compliance Submittal
Asheville 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)]
ACC 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
ACC Unit 05/06 and Unit 07/08 began commercial operations in 2020. Therefore, at the time of this
report the ACC Units have only 3 years of commercial operations.
8.1.2 Utilization for Previous 5 Years
Monthly and annual average capacity factor information for 2020-2022 is provided in Table 8-1 and
Table 8-2. Annual average capacity factors during this period ranged from 59.2 to 79.5 percent. Note
that during 2020, the units were being optimized for long-term operations.
59

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
Table 8-1. Annual Capacity Factors (%) at ACC Unit 05/06, 2020-2022.
Month
2020
2021
2022
January
84.9
97.1
81.2
February
91.6
96.3
84.3
March
66.1
96.3
94.7
April
15.0
6.6
3.0
May
14.3
17.3
0.0
June
29.1
75.4
67.8
July
89.4
86.7
79.0
August
90.2
89.7
91.4
September
61.6
92.1
92.5
October
93.7
63.1
93.0
November
57.7
29.4
96.4
December
52.7
73.8
79.2
Annual Average
62.2
68.6
71.9
Table 8-2. Annual Capacity Factors (%) at ACC Unit 07/08, 2020-2022.
Month
2020
2021
2022
January
24.2
97.3
98.2
February
31.5
71.1
83.6
March
9.5
71.7
72.8
April
49.1
90.8
91.1
May
56.1
87.2
93.3
June
83.6
88.4
84.6
July
82.7
79.1
90.6
August
88.1
70.2
85.4
September
71.9
69.1
45.6
October
10.0
39.7
0.1
November
64.9
98.2
74.3
December
101.3
90.6
98.2
Annual Average
59.2
79.5
74.2
8.2 Major Upgrades in Last Fifteen Years
The ACC represents a new unit at an existing facility. No major upgrades have been completed that
would be applicable to the ACC or its operations.
8.3 Descriptions of Consultation with Nuclear Regulatory
Commission [§122.21(r)(8)(ii)]
Neither the ACC nor the existing Asheville Plant units are nuclear facilities; therefore, consultation with
the U.S. Nuclear Regulatory Commission is not required and was not initiated.
60

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
8.4 Other Cooling Water Uses for Process Units [§122.21(r)(8)(iii)]
The ACC will not use cooling water for process units; therefore, this subsection is not applicable.
8.5 Description of Current and Future Production Schedules
[§122.21(r)(8)(iv)]
ACC is not a manufacturing facility; therefore, this subsection is not applicable.
8.6 Description of Plans or Schedules for New Units Planned within
5 years [§122.21(r)(8)(v)]
There are no plans within the next five years to add additional generation at the ACC.
61

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
9 References
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Prepared for Duke Energy. September 22, 2015.
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November 2014.
Carlander, K.D. 1977. Handbook of Freshwater Fishery Biology. Vol. 2. The Iowa State University Press,
Ames, IA. 431 pp.
Carolina Power and Light (CP&L). 2001. Asheville Steam Electric Plant, 2000 Environmental Monitoring
Report. Environmental Services Section, Progress Energy Company. New Hill, North Carolina.
June 2001.
CB&I North Carolina, Inc (CB&I). 2018. Asheville Combined Cycle Project, Document No.: ACC00-ME-
M-WB-01. Prepared for: Duke Energy Progress, LLC.
Cornish, M. and K. Welke. 2004. Bluegill (Lepomis macrochirus). In: Pitlo, J.M. Jr. and J.L. Rasmussen
(eds.). UMRRC Fisheries Compendium. 3rd Edition. Upper Mississippi River Conservation
Committee. Rock Island, Illinois. January 2004. p. 177-180.
Duke Energy Progress, LLC (DEP). 2005. §316(b) Supplement to NPDES Permit NC000396 Reissuance
Application Package, submitted to NC Division of Water Quality, 2005.
. 2007. Asheville Steam Electric Plant, NPDES Permit Renewal Application Package,
submitted to NC Division of Water Quality, 2007.
2015. Clean Water Act §316(b) Strategic Plan -Asheville Steam Station.
2017a. North Carolina Integrated Resource Plan, September 1, 2017.
2021b. Unpublished data from Lake Julian Aquatic Plant Survey 2021.
2023. 2012-2021 Asheville Environmental Monitoring Report. Duke Energy Progress,
LLC., New Hill, 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.
Electric Power Research Institute (EPRI). 2004. Using Computational Fluid Dynamics Techniques to
Define the Hydraulic Zone of Influence of Cooling Water Intake Structure. 1005528. EPRI,
Palo Alto, CA.
. 2007. Cooling Water Intake Structure Area -of -Influence Evaluations for Ohio River
Ecological Research Program Facilities. 1015322. EPRI, Palo Alto, CA.
Emig, J.W. 1966. Largemouth bass. In: A. Calhoun (ed.). Inland Fisheries Management. State of
California, Department of Fish and Game.
62

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
Etnier, D. and W. Starnes. 1993. The Fishes of Tennessee. Knoxville: The University of Tennessee
Press. 1993.
Gebhart, G. E., and R.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, Oklahoma.
Golder Associates. 2005. Crystal River Energy Complex Proposal for Information Collection. NPDES
Permit No. FL0000159. Prepared for Progress Energy.
Griffith, G.E., J.M. Omemik, J.A. Comstock, M.P. Schafale, W.H. McNab, D.R. Lenat, D.R.
and T.F. MacPherson. 2002. Ecoregions of North Carolina. U.S. Environmental
Protection Agency, Corvallis, Oregon. (map scale 1:1,500,000).
Griffith, J.S. 2011. Effects of Low Temperature on the Survival and Behavior of Threadfin
Shad, Dorosoma petenense. Transactions of the American Fisheries Society, Vol.
107 (1).
Heidinger, R.C. 1975. Life history and biology of the Largemouth Bass. Pages 11-20 In: R.H. Stroud and
H. Clepper (eds.). Black Bass Biology and Management. Sport Fishing Institute, Washington,
D.C.
Hunter, J.R. 1963. The Reproductive Behavior of the Green Sunfish, Lepomis cyanellus. Zoological
48(1): 13-24.
Loar, J.M., J.S. Griffith, and K.D. Kumar. 1978. An analysis of factors influencing the impingement of
threadfin shad at power plants in the southeastern United States. Pages 245-255 in L.D.
Jensen, editor. Fourth national workshop on entrainment and impingement. EA
Communications, Melville, New York.
Leonard, P.M., and D.J. Orth. 1988. Use of habitat guilds of fishes to determine instream flow
requirements. North American Journal of Fisheries Management 8:399-409.
May, R. C. 1974. Larval mortality in marine fishes and the critical period concept. Pages 3-19 in J. H.S.
Blaxter, editor. The early life history of fish. Springer-Verlag, New York.
Mehner, T. 2012. Diel vertical migration of freshwater fishes — proximate triggers, ultimate causes and
research perspectives. Freshwater Biology, 57: 1342-1359.
Miller, R.R. 1960. Systematics and biology of the gizzard shad (Dorosoma cepedianum)
and related fishes. U.S. Fish and Wildlife Service, Bulletin 60: 371-392.
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
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North Carolina Department of Environmental Quality (NCDEQ). 2017. French Broad River Basin
Documents. Accessed March 6, 2017. https://deg.nc.gov/about/divisions/`mitigation-
services/dms-planning/watershed-planning-documents/french-broad-river-basin.
63

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
. 2018a. Water Withdrawal and Transfer Registration Annual Water Use Reports.
Accessed August 7, 2018.
http://www.ncwater.org/Permits and Registration/Water Withdrawal and Transfer Regi
stration/report.
. 2018b. Lake and Reservoir Assessments French Broad River basin. Accessed October
28, 2022.
North Carolina Department of Natural and Cultural Resources (NCDNCR). 2022. North
Carolina Natural Heritage Program. Accessed October 28, 2022.
North Carolina State Board of Health. 1963. Permit for Impounding and Maintenance of Impounded
Water, North Carolina State Board of Health, Sanitary Engineering Division. Raleigh, North
Carolina. July 12, 1963.
Page, L.M. and B.M. Burr. 2011. A field guide to freshwater fishes of North America north of Mexico.
Boston : Houghton Mifflin Harcourt.
Pflieger, W.L. 1997. The Fishes of Missouri. Missouri Department of Conservation, Jefferson City, MO.
372 pp.
Pitlo, J., D. Dieterman, and G. Jones. 2004. Largemouth bass (Micropterus salmoides). In: Pitlo, J.M. Jr.
and J.L. Rasmussen (eds.). UMRRC Fisheries Compendium. 3rd Edition. Upper Mississippi
River Conservation Committee. Rock Island, Illinois. January 2004. pp. 169-173.
Progress Energy Carolinas, Inc. (Progress Energy). 2010. NPDES Permit Renewal Request Asheville
Steam Electric Plant. Permit Number: NC0000396—Attachment #2.
2013. Asheville Steam Electric Plant, 2010-2011. Environmental Monitoring Report.
Water and Natural Resources Section Environmental Services Department, Progress Energy
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Virginia, Maryland, & Delaware. The University of North Carolina Press. Chapel Hill, NC. 222
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University of South Carolina Press, Columbia, SC. 430 pp.
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of Kansas. Kansas.
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64

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
U.S. Fish and Wildlife Service (USFWS). 2022. Information for Planning and Conservation Data Search.
Accessed October 28, 2022. https://ecos.fws.gov/ipac/user/login.
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WSP. 2015. Bathymetric Survey Asheville Cooling Lake (Lake Julian). Arden, NC.
65

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
Appendices

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
Appendix A. Asheville Combine Cycle Station §122.21(r)(2) —
(8), (14) Submittal
Requirement Checklist.
Citation
Title
40 CFR
Requirement
Provided in Report?
122.21(r)
(2)(i)
Narrative description and scaled drawings of source waterbody.
Yes
N
T
a
Identification and characterization of the source waterbody's
Yes, note that no
CU
hydrological and geomorphological features, as well as the
physical studies were
3 0
(2)(ii)
methods used to conduct any physical studies to determine
conducted to
intake's area of influence within the waterbody and the results
determine the area
of such studies.
of influence
0
Ln
(2)(iii)
Locational maps.
Yes
m
( 3)(i)
Narrative description of the configuration of each CWIS and
Yes
where it is located in the waterbody and in the water column.
c
�
o
(3)(ii)
Latitude and Longitude of CWIS.
Yes
m(3)(iIi)
c
Narrative description of the operation of each CWIS.
Yes
�
o ;.
u "'
(3)(iv)
Flow distribution and water balance diagram.
Yes
m
v
(3)(v)
Engineering drawing of CWIS.
Yes
A list of the data supplied in paragraphs (r)(4)(ii) through (vi) of
Yes, but not
(4)(i)
this section that are not available and efforts made to identify
applicable because all
sources of the data.
data are available.
o
(4)(ii)
A list of species (or relevant taxa) for all life stages and their
Yes
relative abundance in the vicinity of CWIS.
c
0
(4)(iii)
Identification of the species and life stages that would be most
Yes
susceptible to impingement and entrainment.
Identification and evaluation of the primary period of
MO
(4)(iv)
reproduction, larval recruitment, and period of peak abundance
Yes
0o
for relevant taxa.
0
_o
Co
(4)(v)
Data representative of the seasonal and daily activities of
Yes
biological organisms in the vicinity of CWIS.
M
m
Identification of all threatened, endangered, and other
(4)(vi)
protected species that might be susceptible to impingement and
Yes
�o
3
entrainment at cooling water intake structures.
v
Documentation of any public participation or consultation with
�°
Federal or State agencies undertaken in development of the
v
(4)(vii)
plan.
Yes, but not
applicable.
A-1

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
Citation
Title 40 CFR Requirement Provided in Report?
122.21(r)
Yes, but not
(4)(viii) Methods and CIA procedures for any field efforts.
applicable as no new
data have been
collected.
In the case of the owner or operator of an existing facility or new
Yes, noted in report
(4)(ix) unit at an existing facility, the Source Water Baseline Biological
that (i) through (xii)
Characterization Data is the information included in (i) through
provide this
(xii).
information.
Identification of protective measures and stabilization activities
that have been implemented, and a description of how these
(4)(x)
Yes
measures and activities affected the baseline water condition in
the vicinity of CWIS.
List of fragile species as defined at 40 CFR 125.92(m) at the Yes, but not required
(4)(xi) facility. because new unit at
an existing facility
Information submitted to obtain Incidental take exemption or
authorization for its cooling water intake structure(s) from the Yes, but not
(4)(xii) U.S. Fish and Wildlife Service or the National Marine Fisheries applicable.
Service.
Narrative description of the operation of the cooling water
(5)(i) Yes
system and its relationship to CWIS.
(5)(i) Number of days of the year the cooling water system is in Yes, anticipated
operation and seasonal changes in the operation of the system. seasonal operations
(5)(i) Proportion of the design intake flow that is used in the system. Yes
0
E
v
Proportion of design intake flow for contact cooling, non -contact
(5)(i) cooling, and process uses. Yes
v
Y
mDistribution of water reuse to include cooling water reused as
(5)(i) process water, process water reused for cooling, and the use of not applicable
0 gray water for cooling.
in
Description of reductions in total water withdrawals including
(5)(i) cooling water intake flow reductions already achieved through Yes
minimized process water withdrawals.
Description of any cooling water that is used in a manufacturing
(5)(i) process either before or after it is used for cooling, including not applicable
other recycled process water flows.
A-2

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
Citation
Title 40 CFR Requirement
122.21(r)
(5)(i) Proportion of the source waterbody withdrawn (on a monthly
basis).
Design and engineering calculations prepared by a qualified
(5)(ii) professional and supporting data to support the description
required by paragraph (r)(5)(i) of this section.
Description of existing impingement and entrainment
(5)(iii) technologies or operational measures and a summary of their
performance.
Identification of the chosen compliance method for the entire CWIS or each
CWIS at its facility.
Impingement Technology Performance Optimization Study for
Modified Travelling Screen.
L
Y
Two years of biological data collection.
(6)(i)
E '^
o
u
0 o
°
o
Demonstration of Operation that has been optimized
to P
minimize impingement mortality.
L �
Q) v
Complete description of the modified traveling screens and
I on
C
associated equipment.
v n
r E
Impingement Technology Performance Optimization Study for
i
Systems of Technologies as BTA for Impingement Mortality.
(6)(ii)
Minimum of two years of biological data measuring the
reduction in impingement mortality achieved by the system.
v Site -specific studies addressing technology efficacy, through
(7)(i) plant entrainment survival, and other impingement and
C m entrainment mortality studies.
c
LL,c E
� (7)(ii) Studies conducted at other locations including an explanation of
a how they relevant and representative.
Provided in Report?
Yes
Yes
N/A
Yes
None Available
None Available
None Available
A-3

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
Citation
Title
40 CFR
Requirement
Provided in Report?
122.21(r)
(7)(iii)
Studies older than 10 years must include an explanation of why
None Available
the data are still relevant and representative.
(8)(i)
Description of individual unit age, utilization for previous 5-year,
Yes, where relevant
major upgrades in last 15 years.
Descriptions of completed, approved, or scheduled uprates and
Yes, but not
(8)(ii)
Nuclear Regulatory Commission relicensing status of each unit at
applicable.
nuclear facilities.
Ln
c
0
(8)(iii)
Other cooling water uses and plans or schedules for
Yes, but not
decommissioning or replacing units.
applicable.
Q
O
(8)(iv)
For all manufacturing facilities, descriptions of current and
Yes, but not
future production schedules.
applicable.
(8)(v)
Descriptions of plans or schedules for any new units planned
Yes
within the next 5 years.
A-4

Appendix B. Asheville Combined Cycle Station, Pertinent
Engineering Drawings
C-219-D — Concrete Intake Structure Plan
G-170903 — Circulating Water System Intake
G-171048 — Intake Steel and Screens
E117624 — Static Screen General Arrangement
B-1

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
B-2

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Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
SH 44
Ulk-3
i,
M

Appendix C: Engineering Calculations for Through -Screen
Velocity
Asheville Combined Cycle Makeup Structure Through -Screen Velocity Calculations
Mike Smallwood, 5/09/2023
NOTE: only one pump per unit can operate (pumps are 100%capacity); therefore two pumps operating per unit Is an implausible scenario.
Operating Flow, Flow, Conversions
Pumps gpm cfs Data Source cfs to gpm = 448.8
SA 1800 4.01 2023 Asheville 316(b) report, Table 3-1
58 1800 4.01 same
7A 1800 4.01 same
7B I800 4.01 same
Structure Bays
Bays 1 Asheville Raw Water Intake Structure General Arrangement (Drawing ACC00-GA•P-IS.00.PL-01)
pumps/bat 2 same
Width, ft 9.17 Asheville Static Screen General Arrangement (Beaudrey Drawing E117624)
Depth, ft 20.0 same
Invert, ft 2144.0 same
Waterbody
Low water level 2158.0 feet Beaudrey drawing E117624
High water level 2165.0 feet same
Static Screens
Wetted depth, low 14.0 feet Beaudrey drawing E117624 (calculated value)
Wetted depth, high 21.0 feet Beaudrey drawing E117624 (calculated value)
Screen width 9.2 feet Beaudrey drawing E117624
Screen open area 0.64 see open area calculation
Through -Screen Velocity Formula (low elevation = 14.0 feet wetted depth)
V=Q/(WD"OA)
Q = 6.46 cfs (one pump), 12.92 cis (two pumps)
WD = screen area for flow = 71.04 ft 2 (@ 14.0 feet wetted depth)
OA = 0.64
note: see "low WD calcs" tab for detail
Calculations (low elevation =14.0 feet wetted depth)
0.09 fps, one pump
0.19 fps, two pumps
Screen Open Area Formula
(W*L)/I(IN+D)"(L+d))
width of mesh opening, Inches (0.25)
L = vertical length of mesh opening, Inches (0.25)
D = vertical wire diameter, inches (0.063)
horizontal wire diameter, Inches (0.063)
A = (0.25.0.25)/[(0.25+0.063) • (0.25+0.063))
0."
Note: assumes wire gauge number = 16
c-1

Clean Water Act §316(b) Compliance Submittal
Asheville Combined Cycle Station
Asheville CC Makeup Structure Screen Frame Open Area Cakulauons
Mike Smallwood, 3/06/2023
"Low Elevation" scenario
Source: Beaudrey drawing E217624
A
A = lower screen, bottom perimeter with seal z 9.17
3 = lower screen, top perimeter = 9.17'
C z lower screen, side perimeter = 2.27'
D intermediate screen, bottom perimeter z 9.17
E = intermediate screen, side perimeter = 223
Conversions
mm to it 0.003281
F : lower screen, vertical supports LW
G - lower sheen, horizontal support = M,
H : intermediate screen, vertical support = 190
1 - intermediate screen, horizontal support = 8&T
Assumption: a8 perimeter framing for each screen panei is 2.0(0.167 feet( face width
Assumption: a8 support framing is 1S" (0.125 feet) face width
Assumptiom seal attached to tower screen adds
no additional depth
A (Lower parsecs) open area:
36.05 1`12
B (Intermediate panels), frame open area 3499 ft2
Perimeter z A+B+2C
3.92 ft2
Perimeter = 2D+2E
3.81 ft2
A=9.17'x M167•
1.53 h2
2D=2x9.17S0-167z
306 ft2
8-9.37 x0.167=
1.53 ft2
2E-2x2_23'.0.167z
D.74 ft2
X z 2 x L27 x (L167'
0.76 ft2
Support = 7H + 31
4.98 f12
Support +7F+36
4.98 h2
7H-7x190'xD.125'=
L66 f12
7F = 7 x 1.90" x 0,125'
1 6G h2
3H z 3x8.84'.D. 125' z
332 W
36=3x8.MxD.M'
3.32 h2
Panel Frame =D'E
2CL45ft2
Panel Frame z AC
20.82 1112
Panels =
3 toUl
Purls z
3 total
Panel height z
223 feet
Panel freight z
2.27 feet
Tool freight =
&69 feet
Total height z
6.81 feet
Total frame z
6137 1`12
Total frame=
62,43 ft2
Totsl frame open, area = lower frame open area + intermedate frame open area z
7LD4
Low Water Level
Is (0)
8 panels (3)
A panels W
n vertical supports . 7
n horizontal supports s 3
C (Intermediate panels) Lame open area: ODD
perimeter - 213•2E
0.00 1112
2D z 2x9.17'x0.167' z
O.OD ft2
2E a 2x3.32'xD.125' -
DAD ft2
Support = I + 3H
0.00 ft2
7H z 7x1.9t1'x(LU5' a
D.OD 112
3H= 3x8.84'x0.12S'z
0.00 ft2
Frame - D'E
DAD ft2
Panels=
3 tout
Parcel height *
O.0D fern
Nate: assume no wider enters C panels
C-2

6 FISH TISSUE MONITORING

Asheville Combined -Cycle Station
i
Fish Tissue Monitoring of the French Broad River
Buncombe County, North Carolina (2019-2022)
NPDES Permit No. NC0000396
Duke Energy Progress
May, 2023

Table of Contents
Page
1.0 Introduction.....................................................................................................................
1
2.0 Methods............................................................................................................................
1
2.1 Study Site....................................................................................................................
1
2.2 Target Species.............................................................................................................
1
2.3 Field Sampling Methods.............................................................................................
2
2.4 Laboratory Process and Analysis................................................................................
2
3.0 Results and Discussion....................................................................................................
2
3.1 Arsenic........................................................................................................................
3
4.0 Summary..........................................................................................................................
4
5.0 References........................................................................................................................ 4
List of Tables
Table Page
3-1 Numbers and total length ranges (mm) of species of fish collected for trace element
analysis in the three sampling areas of the French Broad River during 2019-2022 ......... 3
3-2 Means and ranges of trace elements in fish muscle tissue collected from three
sampling locations in the French Broad River during 2019-2022.................................... 4
List of Figures
Figure Page
1 French Broad River trace element monitoring locations .................................................. 5
Appendices
Appendix A: Arsenic, mercury, and selenium concentrations (wet weight) in axial muscle of fish
from the French Broad River 2019-2022.
Appendix B: Baseline mercury and selenium concentrations (wet weight) in axial muscle of fish
from the French Broad River during August and November 2004.

Fish Tissue Monitoring of the French Broad River Near Asheville Combined Cycle Station (2019-2022)
1.0 Introduction
Duke Energy Progress (DEP) owns and operates the Asheville Combined -Cycle Station
(Asheville Station) located on the east side of the French Broad River in Buncombe County,
Arden, North Carolina. As currently required by the Asheville Station's National Pollutant
Discharge Elimination System (NPDES) Permit No. NC0000396 (current through November 30,
2023), Special Condition A. (15):
"The facility shall conduct fish tissue monitoring annually and submit the results with the
NPDES permit renewal application. The objective of this monitoring is to evaluate
potential uptake of pollutants by fish tissue near the ash pond discharge. The parameters
analyzed in fish tissue shall include arsenic, selenium, and mercury. The monitoring shall
be conducted in accordance with the sampling plan approved by the Division. "
Fish tissue monitoring was originally only required for mercury and selenium after Flue Gas
Desulfurization (FGD) operations commenced in December of 2005. Operation of the FGD
system discontinued when the coal fired generation system was decommissioned in 2019. Electric
generation has transitioned away from coal fired generation to natural gas (combustion turbines).
This data report is submitted to provide an overview of the sampling conducted during the permit
cycle and to fulfill the NPDES permit renewal application.
2.0 Methods
2.1 Study Site
Fish were collected from three locations within the French Broad River (Figure 1). These
locations were adjacent to the Asheville Station discharge (Station DI), 6.2 kilometers upstream
of the discharge (Station UP) and 10.8 kilometers downstream of the discharge (Station DN).
2.2 Target Species
Sunfish (Lepomis) and black bass (Micropterus spp.)/rock bass (Ambloplities spp.) were targeted
for collection based on prior sampling experience, likely availability, potential for human
consumption, and general trophic level. An attempt was made to collect ten fish per target species
with the understanding that six would satisfy permit requirements. As recommended by the U.S.

Environmental Protection Agency (USEPA) an attempt was made to limit the smallest fish to 75%
of the largest fish total length by species depending on availability (USEPA 2000).
2.3 Field Sampling Methods
Fish were collected using electrofishing procedures specified in the Duke Energy Environmental
Science Field Programs procedures (ESFP-SW-0200, Rev. 0 and ESFP-SW-0600, Rev. 0) which
were approved by the North Carolina Department of Environmental Quality under the DEP
Biological Laboratory Certification (# 006). Only live fish that showed little or no signs of
deterioration were retained for analysis, put in a labeled bag, and placed on ice until frozen.
Ancillary fisheries data including species, total length (nun), and total weight (g) were also
recorded. Fish collected were transferred to a freezer daily and maintained frozen until processing
at the DEP New Hill Trace Element Laboratory. Associated water quality data including water
temperature, dissolved oxygen, and specific conductance were recorded daily at the surface at each
sampling location (available on request).
2.4 Laboratory Processing and Analysis
All fish samples were processed individually and analyzed in the trace element laboratory
according to procedures ESFP-SW-0601, Rev. 0 and ESFP-SW-0602 Rev. 0. Fish were thawed
and skeletal muscle was fileted off using a carbon -steel scalpel. Muscle tissue from each
individual fish was homogenized, weighed to the nearest 0.001 g, and completely dried in a
desiccator. The dried weight was recorded and used to calculate a dry weight to fresh (wet)
weight ratio for that fish. Approximately 0.1 g of dried tissue was analyzed for each fish using X-
ray fluorescence. Quality control was achieved utilizing analytical standards, replicates, and
certified reference materials. Following analysis, residual processed samples were archived and
will be kept for at least two years in the event re -analysis is needed.
3.0 Results and Discussion
During the study period (2019-2022), 209 individuals representing seven species were captured
and analyzed from the French Broad River (Table 3-1). These species included Smallmouth Bass
Micropterus dolomieu, Largemouth Bass M. salmoides, Alabama Bass M. henshalli, Rock Bass
Amboplities rupestris, Redbreast Sunfish Lepomis auritus, Bluegill L. macrochirus, and Redear
Sunfish L. microlophus. A full list of individual fish and associated trace element concentrations
2

(wet weight) is presented in Appendix A. In addition to the length and weight of each fish, the
dry -to -wet weight ratios are presented on individual fish to convert the arsenic, mercury, and
selenium concentrations wet weight values back to dry weight values as desired. The 2004
baseline data (prior to the flue gas desulfurization system installation for the coal-fired plant) are
also presented for comparison purposes (Appendix B).
Table 3-1. Numbers and total length ranges (mm) of species of fish collected for trace
element analysis in the three sampling areas of the French Broad River during 2019-2022.
Number
UP
Range
Number
DI
Range
Number
DN
Range
Smallmouth Bass
15
192-377
24
170-473
22
219-420
Black bass
Lar emouth Bass
g
13
248-488
3
178-212
8
454-245
(Micropterus)l
Rock bass
Alabama Bass
1
230
1
390
-
(Amboplities)
Rock Bass
4
186-225
3
154-220
4
175-212
Redbreast Sunfish
33
161-203
26
125-205
32
145-225
Sunfish
Bluegill
3
177-185
8
140-177
5
138-194
(Lepomis)
Redear Sunfish
3
184-208
-
1
170
3.1 Arsenic
All fish collected during 2019-2022 at the three sample locations were well below the USEPA
screening value for recreational anglers of 1.2 µg/g (wet weight) for arsenic (USEPA 2000; Table
3-2).
3.2 Mercury
One of 111 sunfish species collected during 2019-2022 was above the USEPA recreational
screening value of 0.4 µg/g (wet weight) for mercury (USEPA 2000; Table 3-2). Of the 98 black
bass collected 40 were above the 0.4 µg/g mercury screening value. Of these 40 exceedances 16
were from UP, 13 from DI, and 13 from DN.
3.3 Selenium
All fish collected during 2019-2022 at the three sample locations were well below the USEPA
screening value for recreational anglers of 20 µg/g (wet weight) (USEPA 2000; Table 3-2).
K

Table 3-2. Means and ranges of trace elements in fish muscle tissue collected from three
sampling locations in the French Broad River during 2019-2022. All values are in µg/g wet
weight, and the USEPA screening values are shown next to each element. When
concentrations were less than the reporting limit, the reporting limit value was used for
analysis.
Arsenic (1.2)
Selenium (20)
Mercury (0.4)
Mean
Range
Mean
Range
Mean
Range
UP Black bass
0.15
0.12-0.20
0.36
0.23-0.53
0.47
0.09-1.16
Sunfish
0.14
0.12-0.16
0.52
0.30-2.36
0.12
<0.06-0.71
DI Black bass
0.16
0.12-0.20
0.33
0.22-0.67
0.37
0.07-0.77
Sunfish
0.14
0.12-0.16
0.51
0.23-1.22
0.10
<0.06-0.35
DN Black bass
0.15
0.12-0.20
0.39
0.20-0.54
0.34
<0.06-0.72
Sunfish
0.14
0.12-0.15
0.48
0.33-0.66
0.14
<0.06-037
4.0 Summary
When considered altogether, it does not appear that any pattern of arsenic, mercury, or selenium
accumulation in fish tissues existed during the 2019-2022 NPDES permit cycle attributable to the
Asheville Plant operations or in the French Broad River within the reach sampled. Furthermore,
no fish tissue from any location or from any year exceeded the USEPA recreational screening
values for arsenic or selenium. Fish having tissue that did exceed the screening value for mercury
appear to be randomly distributed and unrelated to plant operations. The mercury results seen
during this NPDES permit cycle are also comparable to the 2004 baseline data, indicating that
mercury levels have remained relatively stable in the reach of the French Broad River sampled.
Fish tissue samples were collected every year with at least six fish from each trophic level at three
designated locations in accordance with the state approved study plan satisfying the fish tissue
monitoring requirement of the NPDES permit.
5.0 References
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.
4

A
* Airr+^k C=t.xa-Cyc* Statwn
Fah Tsa�e Vo r.try Laaeoas
.�Re-ere r�a� Rim
Lake x!at
2 Miles
0 1 2 Klometers
Asheville Combined -Cycle Station
MPDES Permit rfC0000345
Figure 1. French Broad River trace element monitoring locations.
DUKE
ENERGY,

Appendix A
Arsenic, mercury, and selenium concentrations (wet weight) in axial muscle of fish from the
French Broad River 2019-2022. Exceedances of screening values are highlighted.
2022
Fish Species
Locations
Month
Length
Weight
As (µg/g)
Hg (µg/g)
Se (µg/g)
Dry -to -Wet'
(MM)
(g)
Weight Ratio
Smallmouth Bass
UP
June
335
432
0.17
0.74
0.32
0.20
Smallmouth Bass
UP
June
236
169
0.15
0.29
0.33
0.20
Smallmouth Bass
UP
October
299
339
0.15
0.56
0.35
0.20
Smallmouth Bass
UP
October
192
104
0.14
0.18
0.26
0.20
Alabama Bass
UP
June
230
164
0.14
0.30
0.43
0.21
Rock Bass
UP
June
212
230
0.15
0.45
0.36
0.20
Largemouth Bass
UP
June
334
493
0.15
0.25
0.30
0.20
Largemouth Bass
UP
June
248
188
0.15
0.21
0.28
0.20
Largemouth Bass
UP
June
342
550
0.12
0.37
0.31
0.20
Largemouth Bass
UP
October
279
319
0.15
0.62
0.36
0.21
Redbreast Sunfish
UP
June
171
114
0.15
0.07
0.33
0.20
Redbreast Sunfish
UP
June
170
93
0.15
0.27
0.46
0.20
Redbreast Sunfish
UP
June
189
148
0.13
0.10
0.38
0.19
Redbreast Sunfish
UP
June
200
169
0.12
0.19
2.36
0.20
Redbreast Sunfish
UP
June
173
106
0.15
0.14
0.39
0.21
Redbreast Sunfish
UP
June
175
114
0.14
< 0.06
0.38
0.20
Redbreast Sunfish
UP
June
161
82
0.15
0.08
0.44
0.20
Bluegill
UP
June
185
118
0.15
0.08
0.30
0.19
Bluegill
UP
June
177
113
0.14
0.28
0.36
0.20
Redear Sunfish
UP
June
208
176
0.16
0.11
0.46
0.21
Smallmouth Bass
DI
June
360
762
0.16
0.26
0.26
0.21
Smallmouth Bass
DI
June
310
437
0.16
0.35
0.32
0.21
Smallmouth Bass
DI
June
194
115
0.16
0.19
0.33
0.21
Smallmouth Bass
DI
June
400
851
0.15
0.51
0.24
0.20
Smallmouth Bass
DI
June
228
164
0.16
0.24
0.34
0.21
Smallmouth Bass
DI
October
270
271
0.16
0.16
0.26
0.21
Smallmouth Bass
DI
October
281
307
0.15
0.23
0.27
0.21
Rock Bass
DI
June
154
79
0.14
0.09
0.40
0.20
Rock Bass
DI
June
161
93
0.12
0.07
0.30
0.19
Rock Bass
DI
October
220
202
0.16
0.30
0.29
0.21
Redbreast Sunfish
DI
June
194
144
0.14
0.08
0.39
0.20
Redbreast Sunfish
DI
June
155
73
0.13
0.07
0.48
0.20
Redbreast Sunfish
DI
June
143
53
0.14
0.13
0.39
0.20
Redbreast Sunfish
DI
June
139
54
0.14
0.11
0.52
0.20
Redbreast Sunfish
DI
June
162
102
0.15
0.08
0.40
0.21
Redbreast Sunfish
DI
June
145
75
0.12
0.06
0.29
0.17
Redbreast Sunfish
DI
October
138
45
0.13
0.06
0.34
0.19
Redbreast Sunfish
DI
October
136
43
0.13
0.13
0.36
0.19
Bluegill
DI
June
177
115
0.13
0.08
0.25
0.19
Bluegill
DI
June
141
58
0.14
< 0.06
0.86
0.21
Smallmouth Bass
DN
June
303
377
0.16
0.38
0.36
0.21
Smallmouth Bass
DN
June
420
906
0.14
0.63
0.34
0.20
Smallmouth Bass
DN
June
364
622
0.16
0.72
0.34
0.20
Smallmouth Bass
DN
June
235
175
0.15
0.20
0.33
0.21
Smallmouth Bass
DN
June
243
201
0.16
0.18
0.31
0.21
Rock Bass
DN
June
175
106
0.14
0.07
0.34
0.21
Largemouth Bass
DN
June
406
1089
0. l3
0.50
0.20
0.18
Largemouth Bass
DN
June
454
1100
0.13
0.72
0.38
0.17
Largemouth Bass
DN
June
251
216
0.13
0.22
0.29
0.19
Largemouth Bass
DN
June
245
176
0.13
0.17
0.29
0.19
Redbreast Sunfish
DN
June
145
69
0.14
0.15
0.53
0.20
Redbreast Sunfish
DN
June
212
182
0.13
0.17
0.44
0.19
Redbreast Sunfish
DN
June
219
214
0.14
0.21
0.37
0.19
Redbreast Sunfish
DN
June
201
167
0.14
0.22
0.39
0.20
Redbreast Sunfish
DN
June
175
125
0.14
< 0.06
0.33
0.21
Redbreast Sunfish
DN
June
213
211
0.15
0.27
0.45
0.21
Bluegill
DN
June
138
61
0.15
0.07
0.33
0.21
Bluegill
DN
June
144
61
0.15
< 0.06
0.40
0.21
Bluegill
DN
June
140
65
0.14
0.06
0.37
0.20
Redear Sunfish
DN
June
170
92
0.15
0.11
0.59
0.21

2021
Fish Species
Locations
Month
Length
Weight
As (µg/g)
Hg (µg/g)
Se (µg/g)
Dry -to -Wet'
(MM)
(g)
Weight Ratio
Redbreast Sunfish
UP
June
182
135
0.14
0.71
0.62
0.20
Redbreast Sunfish
UP
June
190
145
0.13
0.23
0.46
0.19
Redbreast Sunfish
UP
June
187
142
0.13
0.10
0.51
0.19
Redbreast Sunfish
UP
June
171
106
0.14
0.09
0.40
0.20
Redbreast Sunfish
UP
June
197
156
0.14
0.12
0.42
0.20
Redbreast Sunfish
UP
June
185
143
0.13
0.07
0.42
0.19
Redbreast Sunfish
UP
June
188
145
0.16
0.14
0.42
0.20
Redbreast Sunfish
UP
June
180
139
0.16
0.09
0.60
0.20
Redbreast Sunfish
UP
June
200
179
0.14
0.17
0.56
0.20
Redbreast Sunfish
UP
June
185
154
0.15
0.09
0.42
0.19
Smallmouth Bass
UP
June
306
358
0.14
0.74
0.41
0.17
Smallmouth Bass
UP
June
286
324
0.15
0.75
0.40
0.19
Smallmouth Bass
UP
June
275
336
0.17
0.65
0.36
0.21
Smallmouth Bass
UP
June
326
471
0.16
1.09
0.36
0.20
Smallmouth Bass
UP
June
377
791
0.16
0.45
0.30
0.20
Rock Bass
UP
June
225
288
0.15
0.52
0.38
0.19
Smallmouth Bass
UP
August
373
709
0.20
0.75
0.35
0.22
Smallmouth Bass
UP
August
370
624
0.20
1.16
0.46
0.22
Smallmouth Bass
UP
August
265
246
0.17
0.76
0.42
0.21
Smallmouth Bass
UP
August
200
115
0.15
0.21
0.38
0.21
Redbreast Sunfish
DI
June
196
165
0.15
0.35
0.48
0.22
Redbreast Sunfish
DI
June
202
193
0.14
0.21
0.48
0.20
Redbreast Sunfish
DI
June
165
106
0.15
0.12
0.74
0.21
Redbreast Sunfish
DI
June
171
106
0.14
0.06
0.44
0.20
Bluegill
DI
June
148
66
0.14
0.07
0.42
0.20
Redbreast Sunfish
DI
June
156
59
0.13
0.13
0.49
0.18
Redbreast Sunfish
DI
June
151
65
0.14
0.09
0.64
0.20
Bluegill
DI
June
150
67
0.13
0.06
0.30
0.19
Bluegill
DI
June
139
58
0.13
0.06
0.34
0.19
Redbreast Sunfish
DI
June
125
38
0.16
0.07
0.72
0.20
Smallmouth Bass
DI
June
425
1032
0.15
0.53
0.23
0.19
Smallmouth Bass
DI
June
314
390
0.15
0.56
0.27
0.19
Smallmouth Bass
DI
June
387
792
0.16
0.74
0.24
0.20
Smallmouth Bass
DI
June
370
697
0.17
0.67
0.42
0.21
Largemouth Bass
DI
June
178
83
0.14
0.10
0.34
0.20
Largemouth Bass
DI
June
212
124
0.14
0.25
0.36
0.20
Alabama Bass
DI
June
390
660
0.17
0.28
0.67
0.21
Smallmouth Bass
DI
June
410
952
0.16
0.57
0.22
0.20
Smallmouth Bass
DI
June
445
1142
0.14
0.54
0.23
0.18
Redbreast Sunfish
DN
June
209
190
0.14
0.07
0.42
0.20
Redbreast Sunfish
DN
June
216
200
0.14
0.09
0.40
0.20
Redbreast Sunfish
DN
June
225
237
0.14
0.37
0.50
0.20
Redbreast Sunfish
DN
June
208
179
0.13
0.25
0.53
0.19
Redbreast Sunfish
DN
June
209
184
0.13
0.12
0.42
0.19
Redbreast Sunfish
DN
June
192
145
0.13
0.18
0.42
0.19
Redbreast Sunfish
DN
June
177
100
0.13
0.17
0.42
0.19
Redbreast Sunfish
DN
June
179
113
0.14
0.35
0.48
0.20
Redbreast Sunfish
DN
June
212
197
0.14
0.20
0.54
0.20
Redbreast Sunfish
DN
June
158
80
0.14
0.12
0.42
0.20
Rock Bass
DN
June
205
167
0.15
0.13
0.51
0.19
Rock Bass
DN
June
191
134
0.15
0.16
0.36
0.19
Rock Bass
DN
June
212
205
0.14
0.21
0.46
0.20
Smallmouth Bass
DN
June
274
292
0.13
0.41
0.38
0.19
Smallmouth Bass
DN
June
277
289
0.16
0.45
0.46
0.20
Smallmouth Bass
DN
June
354
617
0.16
0.60
0.36
0.20
Smallmouth Bass
DN
June
349
560
0.15
0.63
0.34
0.19
Smallmouth Bass
DN
August
378
588
0.17
0.65
0.40
0.21
Smallmouth Bass
DN
August
275
218
0.16
0.22
0.36
0.20
Largemouth Bass
DN
August
360
634
0.13
0.20
0.31
0.18

2020
Fish Species
Locations
Month
Length
Weight
As (µg/g)
Hg (µWg)
Se (µg/g)
Dry -to -Wet'
(inm)
(g)
Weight Ratio
Redbreast Sunfish
UP
June
187
138
0.15
0.08
0.41
0.21
Redbreast Sunfish
UP
June
188
135
0.14
0.1
0.65
0.20
Redbreast Sunfish
UP
June
190
142
0.14
0.09
0.56
0.20
Redbreast Sunfish
UP
June
188
143
0.14
0.11
0.39
0.20
Redbreast Sunfish
UP
June
184
113
0.15
0.11
0.46
0.20
Redbreast Sunfish
UP
June
193
142
0.13
0.08
0.51
0.19
Redbreast Sunfish
UP
September
168
86
0.15
0.13
0.48
0.20
Redbreast Sunfish
UP
September
181
118
0.15
0.09
0.41
0.19
Redbreast Sunfish
UP
September
169
91
0.15
0.07
0.44
0.21
Redear Sunfish
UP
September
185
104
0.16
0.12
0.57
0.21
Smallmouth Bass
UP
June
311
410
0.16
0.72
0.44
0.19
Smallmouth Bass
UP
June
267
259
0.15
0.93
0.49
0.20
Rock Bass
UP
June
195
155
0.15
0.09
0.49
0.20
Rock Bass
UP
June
186
142
0.19
0.16
0.53
0.23
Largemouth Bass
UP
June
344
568
0.15
0.29
0.44
0.19
Largemouth Bass
UP
June
378
933
0.15
0.35
0.29
0.19
Largemouth Bass
UP
September
297
402
0.14
0.21
0.31
0.20
Bluegill
DI
June
145
61
0.14
0.06
0.40
0.20
Bluegill
DI
June
140
53
0.13
0.07
0.35
0.19
Bluegill
DI
September
172
113
0.16
0.10
0.70
0.20
Redbreast Sunfish
DI
September
185
128
0.13
0.09
0.48
0.19
Redbreast Sunfish
DI
September
205
164
0.14
0.16
0.58
0.19
Redbreast Sunfish
DI
September
150
70
0.13
0.07
0.47
0.19
Smallmouth Bass
DI
June
170
170
0.15
0.14
0.38
0.20
Smallmouth Bass
DI
June
215
215
0.15
0.43
0.43
0.20
Smallmouth Bass
DI
June
237
237
0.15
0.21
0.40
0.20
Smallmouth Bass
DI
June
230
230
0.15
0.14
0.33
0.20
Smallmouth Bass
DI
September
365
365
0.19
0.42
0.34
0.22
Largemouth Bass
DI
June
182
182
0.13
0.15
0.29
0.19
Redbreast Sunfish
DN
June
185
166
0.14
0.16
0.65
0.20
Redbreast Sunfish
DN
June
196
172
0.15
0.08
0.58
0.21
Redbreast Sunfish
DN
June
200
193
0.14
0.09
0.54
0.20
Redbreast Sunfish
DN
June
213
201
0.13
0.08
0.55
0.20
Redbreast Sunfish
DN
June
206
220
0.14
0.09
0.47
0.20
Redbreast Sunfish
DN
September
211
130
0.12
0.14
0.51
0.19
Redbreast Sunfish
DN
September
190
150
0.13
0.14
0.5
0.19
Redbreast Sunfish
DN
September
196
106
0.15
0.16
0.56
0.20
Redbreast Sunfish
DN
September
177
93
0.12
0.07
0.34
0.18
Bluegill
DN
June
164
166
0.14
0.16
0.65
0.20
Smallmouth Bass
DN
June
228
145
0.20
0.15
0.16
0.46
Smallmouth Bass
DN
June
241
185
0.19
0.23
0.14
0.48
Smallmouth Bass
DN
June
239
171
0.20
0.18
0.15
0.48
Smallmouth Bass
DN
June
219
129
0.19
0.16
0.16
0.46
Smallmouth Bass
DN
June
252
210
0.20
0.16
0.16
0.54
Largemouth Bass
DN
June
257
227
0.20
0.26
0.14
0.41
Smallmouth Bass
DN
September
290
247
0.24
0.42
0.20
0.50

2019
Fish Species
Locations
Month
Length
Weight
As (µg/g)
Hg (µg/g)
Se (µg/g)
Dry -to -Wet'
(Min)
(g)
Weight Ratio
Redbreast Sunfish
UP
June
190
159
0.15
0.08
0.47
0.20
Redbreast Sunfish
UP
June
190
149
0.13
0.07
0.59
0.19
Redbreast Sunfish
UP
June
196
158
0.14
< 0.06
0.46
0.20
Redbreast Sunfish
UP
June
203
166
0.15
0.06
0.46
0.20
Redbreast Sunfish
UP
June
186
138
0.14
0.08
0.49
0.20
Redbreast Sunfish
UP
June
180
123
0.14
< 0.06
0.65
0.21
Largemouth Bass
UP
October
488
1700
0.16
0.52
0.44
0.20
Largemouth Bass
UP
October
488
1700
0.15
0.18
0.33
0.20
Largemouth Bass
UP
October
415
1225
0.15
0.28
0.28
0.20
Bluegill
UP
November
184
130
0.16
< 0.06
0.49
0.20
Redear Sunfish
UP
November
184
118
0.16
0.09
0.65
0.21
Redbreast Sunfish
UP
November
171
80
0.14
0.07
0.45
0.20
Largemouth Bass
UP
November
286
278
0.13
0.18
0.26
0.20
Largemouth Bass
UP
November
280
246
0.14
0.17
0.30
0.20
Largemouth Bass
UP
November
349
636
0.14
0.33
0.23
0.20
Redbreast Sunfish
DI
June
182
135
0.14
0.07
0.47
0.20
Redbreast Sunfish
DI
June
178
99
0.13
0.08
1.06
0.19
Redbreast Sunfish
DI
June
165
84
0.14
0.08
0.62
0.19
Redbreast Sunfish
DI
October
200
128
0.13
0.07
0.23
0.20
Redbreast Sunfish
DI
October
200
128
0.13
0.15
0.84
0.19
Redbreast Sunfish
DI
October
188
122
0.14
0.14
0.44
0.19
Redbreast Sunfish
DI
October
182
91
0.12
0.11
1.27
0.19
Redbreast Sunfish
DI
October
179
94
0.14
0.10
0.36
0.19
Smallmouth Bass
DI
June
384
703
0.19
0.47
0.48
0.21
Smallmouth Bass
DI
June
306
297
0.15
0.80
0.49
0.19
Smallmouth Bass
DI
June
290
291
0.16
0.28
0.32
0.20
Smallmouth Bass
DI
October
438
1016
0.16
0.51
0.21
0.21
Smallmouth Bass
DI
October
283
274
0.17
0.37
0.29
0.21
Smallmouth Bass
DI
October
473
1406
0.17
0.65
0.30
0.22
Redbreast Sunfish
DN
October
180
91
0.14
< 0.06
0.55
0.21
Redbreast Sunfish
DN
October
192
122
0.15
0.37
0.60
0.18
Redbreast Sunfish
DN
October
193
125
0.15
0.09
0.58
0.20
Redbreast Sunfish
DN
October
200
156
0.14
0.07
0.52
0.20
Redbreast Sunfish
DN
October
178
99
0.13
0.14
0.62
0.21
Redbreast Sunfish
DN
October
186
122
0.13
0.08
0.60
0.19
Redbreast Sunfish
DN
October
221
172
0.14
0.08
0.56
0.19
Bluegill
DN
October
193
150
0.13
0.10
0.35
0.20
Largemouth Bass
DN
October
327
460
0.14
0.21
0.37
0.20
Largemouth Bass
DN
October
268
217
0.14
0.19
0.41
0.19
Smallmouth Bass
DN
October
395
768
0.14
< 0.06
0.34
0.20
Smallmouth Bass
DN
October
329
422
0.15
0.53
0.41
0.21
Smallmouth Bass
DN
October
385
592
0.16
0.69
0.45
0.19
Smallmouth Bass
DN
October
245
177
0.15
0.12
0.54
0.20
Smallmouth Bass
DN
October
395
768
0.17
0.61
0.36 _
0.22
'To convert to a dry weight, divide the wet weight concentrations by the dry -to -wet weight ratio

Appendix B
Baseline mercury and selenium concentrations (wet weight) in axial muscle of fish
from the French Broad River during August and November 2004.1 Exceedances
of screening values are highlighted.
Locations
Month
Length
Weight
Hg
Se
Dry -to -Wet'
Fish
(inm)
(g)
(µgig)
(µg/g)
Weight Ratio
Species
Smallmouth bass
UP
August
246
201
0.87
0.39
0.22
Smallmouth bass
UP
August
297
370
0.49
0.36
0.21
Smallmouth bass
UP
August
346
620
0.44
0.22
0.22
Smallmouth bass
UP
August
445
1,300
1.66
0.31
0.24
Smallmouth bass
UP
August
370
744
1.49
0.30
0.20
Redbreast sunfish
UP
August
172
106
< 0.18
0.28
0.20
Redbreast sunfish
UP
August
160
87
0.32
0.24
0.20
Redbreast sunfish
UP
August
145
72
< 0.27
0.39
0.30
Redbreast sunfish
UP
August
149
60
< 0.17
0.25
0.21
Redbreast sunfish
UP
August
190
160
0.12
0.32
0.20
Black redhorse
UP
August
372
540
< 0.15
0.26
0.21
Black redhorse
UP
August
380
550
< 0.17
0.19
0.21
Black redhorse
UP
August
410
790
0.53
0.26
0.20
Black redhorse
UP
August
413
843
0.54
0.24
0.19
Black redhorse
UP
August
415
989
0.40
0.30
0.20
Black redhorse
UP
August
405
863
0.46
0.30
0.20
Largemouth bass
DI
August
475
1,725
0.74
1.23
0.21
Largemouth bass
DI
August
395
611
< 0.16
1.46
0.20
Largemouth bass
DI
August
405
795
0.17
0.21
0.21
Smallmouth bass
DI
August
263
223
0.52
0.32
0.22
Smallmouth bass
DI
August
355
565
0.54
4.14
0.22
Smallmouth bass
DI
August
374
871
0.27
0.47
0.23
Smallmouth bass
DI
August
368
802
0.74
0.25
0.22
Smallmouth bass
DI
August
440
1,300
0.99
0.45
0.22
Redbreast sunfish
DI
August
136
52
< 0.19
3.81
0.21
Redbreast sunfish
DI
August
183
108
< 0.17
3.61
0.19
Redbreast sunfish
DI
August
164
80
0.20
0.57
0.20
Redbreast sunfish
DI
August
182
128
< 0.15
0.69
0.19
Redbreast sunfish
DI
August
177
109
0.74
1.23
0.20
Redbreast sunfish
DI
August
149
58
<0.16
1.46
0.20
Black redhorse
DI
August
375
< 0.18
0.26
0.30
0.22
Black redhorse
DI
August
383
0.25
0.25
0.30
0.21
Black redhorse
DI
August
457
0.52
0.48
0.50
0.20
Black redhorse
DI
August
465
0.76
0.21
0.20
0.21
Black redhorse
DI
August
493
0.69
0.21
0.20
0.21
Black redhorse
DI
August
475
0.43
0.77
0.80
0.20
Black redhorse
DI
November
410
<0.18
0.26
0.20
0.20
Smallrouth bass
DN
November
277
265
0.29
0.57
0.21
Smallmouth bass
DN
November
295
410
0.32
0.15
0.21
Smallmouth bass
DN
November
310
460
0.77
0.35
0.22
Smallmouth bass
DN
November
347
620
0.68
0.33
0.22
Smallmouth bass
DN
November
345
750
0.40
0.29
0.22
Bluegill
DN
August
135
59
< 0.16
0.33
0.20
Redbreast sunfish
DN
August
162
66
0.32
0.83
0.20
Redbreast sunfish
DN
August
175
96
< 0.18
0.76
0.22
Redbreast sunfish
DN
August
185
139
0.25
0.31
0.19
Redbreast sunfish
DN
August
198
156
< 0.15
0.27
0.19
Redbreast sunfish
DN
August
273
324
0.54
0.19
0.21
Redbreast sunfish
DN
August
126
46
< 0.14
0.41
0.20
Redbreast sunfish
DN
August
187
170
0.12
0.73
0.20
Redbreast sunfish
DN
August
199
154
< 0.16
0.93
0.20
Black redhorse
DN
August
365
509
< 0.2
0.50
0.20
Black redhorse
DN
August
356
518
0.1
0.30
0.20
Black redhorse
DN
August
375
651
< 0.2
0.80
0.20
Black redhorse
DN
August
395
755
< 0.2
0.50
0.20
Black redhorse
DN
August
388
810
0.5
0.40
0.21
Black redhorse
DN
August
423 _ _
910
< 0.2
0.40
0.19
I Arsenic was not required by permit during baseline monitoring.
2 To convert to a dry weight, divide the wet weight concentrations by the dry -to -wet weight ratio

7 UPDATED COMPLIANCE BOUNDARY

• e
NPDES OUTFALL 001
7r,
\ <r �
>• u
A
✓.C•
;a
RETIRED ASHEVILLE t
STEAM ELECTRIC PLANT ,
FORMER
COAL
PILE
g. 4
FORMER i .
RIM DITCH �� �
VED�IC iASHEVILLE COMBINED
TLING CYCLE STATION
)ND S
n�j••,• �1Fe
FORMER 1982
ASH BASIN R'
a
C� •
Lam■ •• J / �� .
i • ` ".irR7i1
• ' `� I s
NPDES OUTFAL' GG
,i
f �s♦yam �
• J /
LEGEND
♦ NPDES OUTFALL LOCATION (APPROXIMATE)
1%4 ASH BASIN WASTE BOUNDARY
ti I 1982 ASH BASIN WASTE BOUNDARY
1.0000 — COMPLIANCE BOUNDARY
DUKE ENERGY PROGRESS PROPERTY LINE
�• ►— STREAM AND FLOW DIRECTION (TWT 2016)
WETLAND (TWT 2016)
Z FORMER FLUE GAS DESULFURIZATION (FGD) WETLANDS
SURFACE WATER FLOW DIRECTION
a NOTES:
1. THE DEPICTED STREAMS AND WETLANDS DATA WERE APPROVED BY THE US
ARMY CORPS OF ENGINEERS (USACE) ON MAY 19, 2016 - JURISDICTIONAL
DETERMINATION SAW-2014-00189. TAYLOR WISEMAN AND TAYLOR (TWT)
PERFORMED THE SURVEY OF THE FEATURES.
Y
f 2. ALL BOUNDARIES ARE APPROXIMATE.
f
3. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY PROGRESS, LLC.
4. AERIAL IMAGERY OF THE FORMER 1964 BASIN FROM DUKE ENERGY VIA
PROPELLER, COLLECTED APRIL 24, 2023. SURROUNDING AERIAL IMAGERY
OBTAINED FROM GOOGLE EARTH PRO, COLLECTED JANUARY 28, 2021.
5. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE
i PLANE COORDINATE SYSTEM FIPS 3200 (NAD83).
• x' (' DUKE
ENERGY
PROGRESS
WnTerm
.A �'.
GRAPHICSCALE a
300 0 300 600
ON FEET) FIGURE 1
DRAWN BY:T KING DATE: 03/24/2020 SITE LAYOUT MAP
REVISED BY: T. KING DATE. 05/18/2023 ASHEVILLE STEAM ELECTRIC PLANT
CHECKED BY: K. FERRI DATE: 05/18/2023 AR.DEN. NORTH CAROLINA
APPROVED BY: K. FERRI DATE: 05/18/2023
PROJECT MANAGER: K. FERRI -

7.1 Ash Basin Closure

• Coal Ash Excavation Plan, Asheville Steam Electric Generating Plant submitted on
December 12, 2019.
• Ash Removal Verification Report -1964 Ash Basin - Asheville Steam Electric Plant dated
August 31, 2022.
• Email from Ashley Healy to Eric Smith and Poonam Giri with the subject, Asheville - 1964
Ash Basin Coal Ash Tons Excavated and Dispositioned sent on September 13, 2022.
• Email from Ashley Healy to Eric Smith with the subject, Asheville - 1964 Ash Basin Coal
Ash Torts Excavated and Dispositioned sent on September 15, 2022.
• Email from Ashely Healy to Eric Smith with the subject, Duke Energy Asheville - 1964
Ash Basin - Ash Removal Verification Report Submittal sent on September 30, 2022.
Based on correspondence received by DEQ from Duke Energy, the dewatering of the 1964 Ash
Basin was completed on May 13, 2016, and ash removal was completed on June 23, 2022. Field
verification of coal ash removal met the objectives of sample collection and analysis consistent
with the recommended technical direction outlined in DEQ's CCR Surface Impoundment Closure
Guidelines for Protection of Groundwater.
The final field excavation totals of the coal combustion residuals transported from the facility for
ultimate handling and the amounts, in tons, sent to each permitted facility are documented per the
September 13, 2022, email from Ashley Healy to Eric Smith and Poonam Giri (documented above)
as follows:
• Beneficial Reuse (Roanoke Cement - 6071 Catawba Rd, Troutville, VA) - 69,280 tons
(basin ash)
• On -Site Landfill - 1,448,746 tons (basin ash)
• R&B Landfill (610 Bennett Rd, Homer, Georgia) - 1,282,102 tons (basin ash)
• 1964 Ash Basin Lined Rim Ditch (1964 Ash Stack) - 283,230 tons (production ash)
Duke Energy also notes the following regarding the tonnages listed above:
• The 1964 Ash Stack tonnages that were excavated from the 1982 Ash Basin are not
included. This total was included in the total tonnages for the 1982 Ash Basin
(Documentation of Compliance with Coal Ash Management Act for 1982 Ash Basin June
8, 2021, letter from NCDEQ).
• Excavated total tonnage from Flue Gas Desulfurization Wetlands (non -ash), formerly
located within the 1964 Ash Basin, is not included.
Based on the documentation provided above, DEQ hereby concurs that Duke Energy has complied
with Sections 3(b) and 3(c) of CAMA with the exception of 3.(c)(3), which is still in progress.
Section 3(c)(3) states, "If restoration of groundivaler quality is degraded as a result of'the
impoundment, corrective action to restore groundwater quality shall he implemented by the
owner or operator as provided in G.S. 130A-309.20[9]."
D_ E Q
�� North Carolina Department of Environmental Quality
217 West Jones Street 1 1601 Mall Service Center I Raleigh. North Carolina 27699-1601
e�w��%.++ow� % 919.707.8600

Duke Energy is expected to comply with other closure requirements concerning groundwater
corrective action for Asheville as required by CAMA and in conformance with Title 15A of the
North Carolina Administrative Code 02L .0100 General Considerations of the Groundwater
Classifications and Standards Rules. Any remaining soil contamination shall be addressed by the
facility corrective action plan and incorporated into the groundwater fate and transport modeling.
The date of this letter shall also serve as the beginning date for the 30-year post -closure monitoring
period for the subject basin.
If you have any questions, please contact Eric Smith at [phone] or Edward Mussler at (919)
707-8281.
Sincerely,
kGrzyP75
Director
Division of Water Resources
Sincerely, Digitally signed by
Edward F. Mussler
4 III
i
Date: 2022.10.17
14 0429-04'00'
Edward F. Mussler III, P.E.
Chief, Solid Waste Section
Division of Waste Management
cc: Landon Davidson — ARO Regional Office (electronic)
Ted Campbell — ARO Regional Office (electronic)
Sushma Masemore — DEQ (electronic)
Toby Vinson — DEMLR (electronic)
Ed Sullivan — Duke Energy (electronic)
John Toepfer — Duke Energy (electronic)
Scott Davies — Duke Energy (electronic)
Ashley L. Healy — Duke Energy (electronic)
GWRS Central Office File Copy
North Carolina Department of Environmental Quality
217 West Jones Street 11601 Mail Service Center I Raleigh. North Carolina 27699-1601
919.707.8600

(� DUKE
ENERGY:
November 18, 2022
Ms. Sushma Masemore, P.E.
Assistant Secretary for the Environment
North Carolina Department of Environmental Quality
1613 Mail Service Center
Raleigh, North Carolina 27699-1613
Jessica L. Bednarcik
Senior Vice President
Environmental Health & Safety
Coal Combustion Products
526 South Church Street, ST06K
Charlotte, NC 28202
o: 704.382, 8768
c: 704.907.8628
[e-mail]
Subject: Updated Corrective Action Plan Report for the Asheville Steam Electric Plant, Arden,
Buncombe County, North Carolina, NPDES Permit No. NC0000396
Dear Ms. Masemore:
Duke Energy is pleased to submit the enclosed updated Corrective Action Plan (CAP) for the Asheville Steam
Electric Plant. As specified in the North Carolina Department of Environmental Quality (NCDEQ) electronic
mail dated March 7, 2022, this updated CAP incorporates multi -media data collected in and around the
former 1964 Ash Basin, former 1982 Ash Basin, and former coal pile area inclusive through Quarter 12022.
The enclosed updated CAP recommends the following corrective actions at Asheville:
• Source removal by excavation combined with monitored natural attenuation (MNA) as a polishing
remedy along with a groundwater use restriction for the areas that include the former 1964 Ash
Basin and former 1982 Ash Basin, as required by the Coal Ash Management Act of 2014, Session Law
2014-122 (CAMA);
• Source removal by excavation and application of hydrated lime combined with MNA as a polishing
remedy along with a groundwater and land use restrictions for an area that includes the former coal
pile area; and
• Implementation of an Effectiveness Monitoring Plan (EMP) with a five-year review period to monitor
the effectiveness of corrective action.
Source removal by excavation is the active groundwater remedy for the three source areas listed above.
MNA is proposed as a polishing remedy for use in the areas with limited constituents of interest (COI) beyond
the ash basin compliance boundary and in the vicinity of the former coal pile area. The use of MNA is based
on generally stable or decreasing COI concentration trends in groundwater samples collected at the site and
lack of COls above applicable standards in potential receptor areas (i.e., surface water). A groundwater use
restriction is also proposed as an institutional control to prevent installation of water supply wells in a
portion of the former coal pile area; CAMA already requires such designation of groundwater use
restrictions.
RECEIVED
Ri;11DING ASMARTER FNFRGYF11T11RF" JUN U 7 2023
NCDEQ/DWR/NPDES

Ms. Sushma Masemore, P.E.
November 18, 2022
Page 2
As detailed in the enclosed updated CAP, source removal by excavation began at the site in 2007 and
completed June 2022, approximately 5,304,504 tons of ash have been excavated from the former 1982 Ash
Basin and approximately 3,083,898 tons of ash have been excavated from the former 1964 Ash Basin, while
all coal was removed from the former coal pile area shortly after plant retirement in 2020. As specified in the
NCDEQ letters dated June 8, 2021, and October 17, 2022, the 1982 Ash Basin and 1964 Ash Basin are in
compliance with closure requirements of CAMA Sections 3(b) and 3(c) with the exception of 3(c)(3), which
the enclosed updated CAP report addresses.
The COI concentrations downgradient of the source areas vary but are generally stable or decreasing based
on groundwater data collected to date. Evidence of conditions favorable for natural attenuation are
indicated via multiple lines of evidence that include time trend analysis, geochemical evaluation and
groundwater flow and transport modeling. The reduction in hydraulic head and mass contribution from the
former source areas is anticipated to be sufficient for natural attenuation processes to reduce COI
concentrations beyond the compliance boundary and in the vicinity of the former coal pile area.
Effectiveness monitoring is proposed to confirm the stable or decreasing COI concentration trends currently
indicated.
The enclosed updated CAP report also concludes there is no evidence of unacceptable risks to humans and
wildlife at Asheville attributed to coal or coal ash constituent migration in groundwater from the ash basins
and former coal pile area. This conclusion is further supported by decades of water quality and biological
assessments conducted by Duke Energy as part of NPDES and other site monitoring programs.
If you have any questions on the enclosed information, please contact Ed Sullivan at 980-373-3719.
Sincerely, `
J' essica L. Bednarcik
Senior Vice President
EHS and CCP
Enclosure: Updated Corrective Action Plan, Asheville Steam Electric Plant
cc: Ted Campbell — NCDEQ Asheville Regional Office
Karen Higgins — NCDEQ Central Office
Ed Sullivan — Duke Energy
Jason Tillotson —Arcadis G&M of North Carolina, Inc.

7.3 Surface Water Monitoring

ROY COOPER
Governor
,IZABETH S. B1SER
xetary
RICHARD E. ROGERS, JR.
Director
NORTH CAROLINA
Environmental Quality
January 9, 2023
Jessica Bednarcik, Senior Vice President
Environmental, Health & Safety
Duke Energy
526 South Church Street
Mail Code EC3XP
Charlotte, North Carolina 28202
Subject: Surface Water Evaluations
Allen Steam Station, Asheville Steam Electric Plant, Belews Creek Steam
Station, Buck Combined Cycle Station, Cape Fear Steam Electric Plant, James
E. Rogers Energy Complex (Formerly Cliffside Steam Station), Dan River
Combined Cycle Station, H. F. Lee Energy Complex, Marshall Steam Station,
Mayo Steam Electric Plant, Riverbend Steam Station, Roxboro Steam Electric
Plant, L. V. Sutton Energy Complex, and W. H. Weatherspoon Power Plant
Dear Ms. Bednarcik:
Per the Updated Corrective Action Plan (CAP) Conditional Approval letters or Updated
Comprehensive Site Assessment (CSA) Comment letters for the subject sites, the North Carolina
Department of Environmental Quality (DEQ) stated that it would provide additional comments
and direction regarding surface water in an upcoming separate correspondence. This letter shall
satisfy that comment and the surface water evaluation provided herein will assist Duke Energy
with the preparation of required Surface Water Assessment Plans for the subject facilities.
Please note that DEQ has previously provided surface water comments for the Roxboro Steam
Electric Plant (Roxboro) in DEQ's Corrective Action Plan Update Conditional Approval and
Additional Information Request Letter dated April 27, 2021. The evaluation for Roxboro provided
in this correspondence shall supersede those comments.
Methodolg&
Evaluations were conducted by the DEQ Division of Water Resources (DWR). For each of the
subject facilities, surface water data was evaluated for each sample location as identified in the
facility's comprehensive data spreadsheet as noted below. Sample data were compared to surface
water quality standards established in 15A NCAC 02B .0211 through .0225 (2B Standards), In -
stream Target Values (ISTVs) calculated per 15A NCAC 02B .0208, and the U.S. Environmental
Protection Agency's National Recommended Water Quality Criteria (EPA NRWQC). For the
purpose of these evaluations, the 2B Standards took precedence over EPA NRWQC, and the EPA
DNorth Carolina Department of Environmental Quality Di%isioo of Water Resources
_ �� 512 North Salisbury Street 1611 Mail Service Center Raleigh. North Carolina 27699-1611
1 /� 919,707.9000
an

Surface Water Evaluations
Duke Energy
January 9, 2023
NRWQC took precedence over ISTVs. DWR did not evaluate any surface water samples that
were categorized as an "Area of Wetness" except if it was determined to be a non-dispositioned
seep by Duke Energy in the comprehensive data spreadsheets as referenced below.
Surface Water Data Used for Evaluation
DEQ used the surface water data from Duke Energy's comprehensive data spreadsheets that are
submitted to the DEQ DWR on a quarterly or semi-annual basis. The following is a list of the
comprehensive data spreadsheets (as named by Duke Energy) that were used for the evaluation for
each facility:
• Allen Steam Station — Allen_All Media thru 2022-03
• Asheville Steam Electric Plant —Asheville All Media thru 2022-05
• Belews Creek Steam Station — REVISED _Belews_Comprehensive All Media thru 2022-05
• Buck Combined Cycle Station — Buck All Media thru 2022-03
• Cape Fear Steam Electric Plant — Cape Fear All Media thru 2022-03 san Ash Removal
• James E. Rogers Energy Complex (formerly Cliffside Steam Station) —
Cliffside_Comprehensive All Media thru 2022-02
• Dan River Combined Cycle Station — Dan River_ Comprehensive All Media thru 2021-12
• H. F. Lee Energy Complex — HF Lee All Media thru 2022-03
• Marshall Steam Station — Marshall All Media thru 2022-03
• Mayo Steam Electric Plant — Mayo All Media thru 2022-06
• Riverbend Steam Station — Riverbend All Media thru 2022-06
• Roxboro Steam Electric Plant — Roxboro All Media thru 2022-05
• L. V. Sutton Energy Complex — Sutton All Media thru 2022-03
• W. H. Weatherspoon Power Plant — Weatherspoon All Media thru 2022-05
These spreadsheets represent the cut-off dates for the data reviewed. Any data submitted after
these dates was not evaluated.
Letter Package Organization
The "Surface Water Evaluation" attachments for each subject facility have two tables. The first
table identifies the surface water body and classification for each of the surface water samples
collected. The second table contains more specific information for each sampling location
including any constituents of interest (COIs) detected above the 2B Standards, ISTVs, and/or EPA
NRWQC, along with DWR's comments/observations and required actions. The required actions,
if any, are listed in the last column.
Included after each site -specific Surface Water Evaluation are two additional attachments that
further identify the physical locations of the surface water samples: a map and a list of latitudes
and longitudes.
The "General Water Quality Required Actions" attachment contains general required actions
applicable to all facilities.
Page 2 of 4

Surface Water Evaluations
Duke Energy
January 9, 2023
Summary of Evaluation Results
The following table summarizes DWR's findings.
Facility
Total No. of Surface Water
Sampling Sites and Non-
Dis ositioned Seeps Evaluated
No. of Surface Water Sampling Sites
and/or Non-Dispositioned Seeps with
Required Actions
Allen Steam Station
31
4
Asheville Steam Electric Plant
67
17
Belews Creek Steam Station
46
8
Buck Combined Cycle Station
20
9
Cape Fear Steam Electric Plant
44
2
James E. Rogers Energy
Complex (formerly Cliffside
Steam Station
48
7
Dan River Combined Cycle
Station
29
1
H. F. Lee Energy Complex
33
0
Marshall Steam Station
22
9
Mao Steam Electric Plant
13
4
Riverbend Steam Station
21
3
Roxboro Steam Electric Plant
18
3
L. V. Sutton Energy Complex
24
0
W. H. Weatherspoon Power
Plant
20
0
TOTALS
436
67
Required Documents
Per the Updated CAP Conditional Approval letters or Updated CSA Comment letters for the
subject sites, DEQ required the following from Duke Energy:
Develop and submit a Surface Water Assessment Plan for DEQ approval to address
monitoring of surface waters at the facility. The Plan shall include monitoring of non-
dispositioned seeps to the extent that such monitoring is not part of routine NPDES
monitoring. The Plan shall also account for any surface water features that emerge in or
downgradient of the footprint of the former coal ash basin(s) during the closure and post -
closure period and include a proposed monitoring schedule. If surface water standard
exceedances caused by coal combustion residuals are identified or develop during the
closure process, DEQ may require that the CAP be revised to address these exceedances.
Within 90 days of receiving this letter, Duke Energy shall use the information provided in this
letter, including any required actions, to develop a Surface Water Assessment Plan for each of the
subject facilities. The Surface Water Assessment Plans shall be considered addendums to the
CAPs or CSAs, as appropriate. After receiving the Surface Water Assessment Plans, DEQ will
review them for approval or provide additional comments, if necessary. For the seeps at each
facility regulated under a Special Order by Consent, the approval of the Surface Water Assessment
Plans shall conclude Duke Energy's NPDES monitoring and reporting obligations as stated in the
facility -specific Special Order by Consent termination letters.
Page 3 of 4

Surface Water Evaluations
Duke Energy
January 9, 2023
For questions regarding groundwater assessments at each facility, please contact the appropriate
DWR Regional Office staff. For questions concerning surface water standards and classifications,
please contact Paul Wojoski at [phone]. For questions concerning the NPDES permits,
please contact Sergei Chernikov at [phone].
Sincerely,
Karen Higgins, Chief
Water Planning Section
Attachments:
1. Allen Steam Station Surface Water Evaluation (plus map and coordinates)
2. Asheville Steam Electric Plant Surface Water Evaluation (plus map and coordinates)
3. Belews Creek Steam Station Surface Water Evaluation (plus map and coordinates)
4. Buck Combined Cycle Station Surface Water Evaluation (plus map and coordinates)
5. Cape Fear Steam Electric Plant Surface Water Evaluation (plus map and coordinates)
6. Cliffside Steam Station Surface Water Evaluation (plus map and coordinates)
7. Dan River Combined Cycle Station Surface Water Evaluation (plus map and coordinates)
8. H. F. Lee Energy Complex Surface Water Evaluation (plus map and coordinates)
9. Marshall Steam Station Surface Water Evaluation (plus map and coordinates)
10. Mayo Steam Electric Plant Surface Water Evaluation (plus map and coordinates)
11. Riverbend Steam Station Surface Water Evaluation (plus map and coordinates)
12. Roxboro Steam Electric Plant Surface Water Evaluation (plus map and coordinates)
13. L. V. Sutton Energy Complex Surface Water Evaluation (plus map and coordinates)
14. W. H. Weatherspoon Power Plant Surface Water Evaluation (plus map and coordinates)
15. General Water Quality Required Actions
cc (electronic): WQROS Asheville Regional Office Supervisor
WQROS Fayetteville Regional Office Supervisor
WQROS Mooresville Regional Office Supervisor
WQROS Raleigh Regional Office Supervisor
WQROS Washington Regional Office Supervisor
WQROS Wilmington Regional Office Supervisor
WQROS Winston-Salem Regional Office Supervisor
Julie Grzyb — Division of Water Resources Assistant Director
Karen Higgins — Water Planning Section Chief
Paul Wojoski — Classifications, Standards, & Rules Review Branch
Sergei Chernikov — Water Quality Permitting Section
Bob Sledge — Water Quality Permitting Section
Ed Sullivan — Duke Energy
John Toepfer — Duke Energy
Scott Davies — Duke Energy
Page 4 of 4

Attachment 2
Asheville Steam Station Surface Water Evaluation
Facility NPDES Permit: NC0000396
County: Buncombe
Special Order by Consent: S 17-010 — Terminated May 18, 2022
Data Source
The comprehensive surface water data that was used for this evaluation was current through May
2022 (Asheville All Media thru 2022-05).
Classified Surface Waters and Associated Sampling Sites
Surface Waters, Classifications,
and Associated Sampling Locations
Water Body and Location
Classification
Associated Sam ling Locations
FB_DOWN, FB-D/S (downstream), FB-MID (downstream),
French Broad River
B
FB_UP, FB-1, FB-1-A (upstream), FB-2, SW-FB1, SW-FB2,
SWFBR-1 SWFBR-2 SWFBR-3 SWFBR-4
Powell Creek
C
SW-01 SW-7 2012
Lake Julian
C
SW-07 SWLJ-1
Other flows to Lake Julian
C
SW-06
Unnamed tributary (South of
B
SW-13(H1), SW-H2, SW-H3, SW-13 2012, P-01
1982 Basin
Wetlands complex (between
SW-02, SW-03, SW-04, SW-11 2012, SW-12 2012, F-03-B,
highway and French Broad
B
K-01-A
River
Undetermined (may flow to
SW-01_2012, SW-02_2012, SW-03_2012, SW-04_2012,
French Broad River)
B
SW-05_2012, SW-06 2012, SW-08 2012, SW-09 2012,
SW-10 2012, SW-l1. A-01-A. A-01-AA. TD-01
Non- Dis ositioned Seeps
Sampling
Receiving
Classification
Description
Site
Water Body
Wetlands
Non- Constructed Seep. Point of drainage to French Broad
A-01
draining to
B
River from wetland/braided flow west of I-26. Northernmost
French Broad
sample locations near river.
River
Wetlands
A-02
draining to
B
Non- Constructed Seep. Minor seep in wet area just upstream
French Broad
of A-01. Channeled flow drains toward A-0I location.
River
Wetlands
Non- Constructed Seep. Point of drainage to French Broad
B-01
draining to
B
River from wetland/braided flow west of I-26 and south of A -
French Broad
01
River
Unnamed
Non- Constructed Seep. Point of drainage to French Broad
C-01
Tributary to
B
River from wetland/braided flow west of 1-26 and south of B-
the French
01.
Broad River
Unnamed
Non- Constructed Seep. Monitoring location of UT below
C-02
Tributaryto
B
1964 Ash Basin for effects of general area seepage; site is
Page I of 17

the French
located just east of culvert under I-26. Stream flow is
Broad River
conveyed into wetland area draining toward C-01 location.
Wetlands
D-01
draining to
B
Non- Constructed Seep. Seep to established channel within
French Broad
wetlands west of I-26. Channel flows to C-01 location.
River
Wetlands
draining to
Non- Constructed Seep. Point of drainage to French Broad
E-01
French Broad
B
River from wetland/braided flow west of I-26 and south of C-
River
01 drainage.
Wetlands
draining to
Non- Constructed Seep. Point of drainage to French Broad
F-01
French Broad
B
River from wetland/braided flow west of I-26 and south of E-
River
01 drainage.
Wetlands
draining to
Non- Constructed Seep. Point of drainage to French Broad
F-02
French Broad
B
River from wetland/braided flow west of I-26 and south of F-
River
01 drainage.
Wetlands
Non- Constructed Seep. Monitoring location within wetland
F-03
draining to
B
area west of 1-26, at outlet of culvert under I-26. May be
French Broad
remnant beaver pond. Flows toward F-01 location, then to
River
French Broad River.
Unnamed
tributary to
Non- Constructed Seep. Monitoring location of UT below the
Wetlands,
1982 Ash Basin dam, just east of culvert under I-26,
K-01
drains to
B
conveying flow to wetlands west of I-26. Flows drain through
French Broad
wetlands past locations. F-03 and F-01 before entering
River
French Broad River.
Wetlands
Non- Constructed Seep. Monitoring location for coalescence
M-01
draining to
Not
of seep flows prior to entering culvert under I-26. Flow
French Broad
Applicable'
drains through wetlands to sampling location F-01 before
River
entering French Broad River.
N-01
Unnamed
Tributary to
C
Non- Constructed Seep. Seep to small channel upstream of
Powell Creek
its confluence with Powell Creek.
Wetlands
Ponded
draining to
Not
Non- Constructed Seep. Ponded water near dry channel
Water F
French Broad
Applicable'
between locations B-01 and C-01.
River
Unnamed
tributary to
wetlands,
Non- Constructed Seep. Western drain (Drain 1) from 1982
82EO-01
drains to
B
ash basin. Basin has been excavated and repurposed. Any
French Broad
flow would drain to K-01 and F-01 locations.
River
Unnamed
tributary to
Non- Constructed Seep. Eastern drain (Drain 2) from 1982
82EO-02
wetlands,
B
ash basin; east weir. Basin has been excavated and
drains to
repurposed. Any flow would drain to K-01 and F-01
French Broad
locations.
River
' DEQ has determined this is not a stream.
Page 2 of 17

Unnamed
tributary to
French drain below divider dike between '64 and past '82
DD -Pipe
wetlands,
Not
basin. Flow is into former 1982 basin footprint which was
drains to
Applicable z
recently removed from the NPDES permit. Flow would drain
French Broad
toward M-01 location and then to sample point at F-01.
River
2 This location will need a stream determination by DEQ.
Page 3 of 17

Asheville Steam Electric Plant Station — Surface Water Standards Evaluation
NPDES General Notes
• The update to the permit renewal application submitted in 2014 provided instream sampling data for oil & grease, chemical oxygen demand (COD),
chlorides, fluoride, sulfate, mercury, aluminum, barium, boron, calcium, hardness, iron, magnesium, manganese, zinc, antimony, arsenic, cadmium,
chromium, copper, lead, molybdenum, nickel, selenium, thallium, total dissolved solids (TDS), total suspended solids (TSS), pH, temperature,
specific conductance, and turbidity. The upstream monitoring station was located 5,500 ft. upstream of Outfall 001 and the downstream monitoring
station was located 2,900 ft. downstream of the Outfall 001.
• The following parameters were below detection level at both monitoring stations: oil & grease, COD, fluoride, mercury, boron, antimony, arsenic,
cadmium, chromium, copper, lead, molybdenum, nickel, selenium, and thallium. The rest of the parameters did not indicate a significant difference
between the upstream and the downstream monitoring locations except for specific conductance.
• The permit requires monthly monitoring in French Broad River for total arsenic, total selenium, total mercury, total chromium, dissolved lead,
dissolved cadmium, dissolved copper, dissolved zinc, total bromide, total hardness (as CaCO3), temperature, turbidity, and TDS.
Parameters that
Water Body
Sampling Site
Exceed a 2B
Comments/Observations
Required Actions for Use in Developing a
Standard, EPA
Surface Water Assessment Plan
NRW C, or ISTV
Dissolved Oxygen,
• Dissolved Oxygen and Turbidity in stream
FB_DOWN
Turbidity
likely due to factors other than contaminated
• None
groundwater.
• Based on analysis of the samples, the 2B
FB-D/S
None
standards were not violated at this sampling
• None
location during the evaluation period.
• Based on analysis of the samples, the 2B
FB-MID
None
standards were not violated at this sampling
• None
location during the evaluation period.
French Broad
pH, Dissolved
• pH, Dissolved Oxygen, and Turbidity in stream
River
FB UP
—
Oxygen, Turbidity
likelydue to factors other than contaminated
• None
groundwater.
• Turbidity in stream likely due to factors other
than contaminated groundwater.
FB-1
Turbidity, Iron
• The naturally occurring background
• None
concentrations for iron are high, therefore no 2B
standard violation was observed for iron at this
sampling location.
• Based on analysis of the samples, the 2B
FB-1-A
None
standards were not violated at this sampling
• None
location during the evaluation period.
Page 4 of 17

• Turbidity in stream likely due to factors other
than contaminated groundwater.
FB-_
Turbidity, Iron
• The naturally occurring background
None
concentrations for iron are high, therefore no 2B
concentrations
standard violation was observed for iron at this
sampling location.
• The naturally occurring background
SW -FBI
Iron
concentrations for iron are high, therefore no 2B
None
standard violation was observed for iron at this
standard
sampling location.
• Based on analysis of the samples, the 2B
SW-FB2
None
standards were not violated at this sampling
None
location during the evaluation period.
• Copper exceedance is a transient standard
excursion that might be related to the impacts
from the boundary conditions. The sampling
SWFBR-1
Copper
site does not accurately represent instream
None
conditions. Permit sampling does not show
copper standard violations in the main stem of
the French Broad River.
• Copper exceedance is a transient standard
excursion that might be related to the impacts
from the boundary conditions. The sampling
SWFBR-2
Copper
site does not accurately represent instream
None
conditions. Permit sampling does not show
copper standard violations in the main stem of
the French Broad River.
• Copper exceedance is a transient standard
excursion that might be related to the impacts
from the boundary conditions. The sampling
site does not accurately represent instream
conditions. Permit sampling does not show
SWFBR-3
Copper, Iron
copper standard violations in the main stem of
• None
the French Broad River.
• The naturally occurring background
concentrations for iron are high, therefore no 2B
standard violation was observed for iron at this
sampling location.
Page 5 of 17

• Copper exceedance is a transient standard
excursion that might be related to the impacts
from the boundary conditions. The sampling
site does not accurately represent instream
conditions. Permit sampling does not show
SWFBR-4
Copper, Iron
copper standard violations in the main stem of
• None
the French Broad River.
• The naturally occurring background
concentrations for iron are high, therefore no 2B
standard violation was observed for iron at this
sampling location.
• The naturally occurring background
concentrations for iron and manganese are high,
Iron, Manganese,
therefore no 2B standard violation was observed
SW-0I
Zinc
for iron and manganese at this sampling
• None
location.
Powell Creek
. April 2015 dissolved Zinc value has the
appearance of an outlier.
• Based on analysis of the samples, the 2B
SW-7 2012
None
standards were not violated at this sampling
None
location during the evaluation period.
• Turbidity in stream likely due to factors other
than contaminated groundwater.
• The naturally occurring background
Other (flows
Turbidity, Iron,
concentrations for iron are high, therefore no 2B
to Lake
SW-06
Copper
standard violation was observed for iron at this
• None
Julian)
sampling location.
• Isolated copper standard exceedance from a
sampling location beyond the estimated extent
of contaminated groundwater influence.
• pH in stream likely due to factors other than
contaminated groundwater.
• The naturally occurring background
pH, Iron,
concentrations for iron are high, therefore no 2B
Lake Julian
SW-07
Manganese, Zinc
standard violation was observed for iron at this
None
sampling location.
• Zinc exceedance is a transient standard
excursion that might be related to the impacts
from the boundary conditions. The sampling
Page 6 of 17

site does not accurately represent instream
conditions. Permit sampling does not show zinc
standard violations in Lake Julian.
• Based on analysis of the samples, the 2B
SWLJ-1
None
standards were not violated at this sampling
• None
location during the evaluation period.
• Based on analysis of the samples, the 2B
SW-13(H1)
None
standards were not violated at this sampling
• None
location during the evaluation period.
• Based on analysis of the samples, the 2B
SW-1-12
None
standards were not violated at this sampling
• None
Unnamed
location during the evaluation period.
tributary
• Based on analysis of the samples, the 2B
(South of
SW-1-13
None
standards were not violated at this sampling
• None
1982 Basin)
location during the evaluation period.
• Based on analysis of the samples, the 2B
S W-13 2012
None
standards were not violated at this sampling
• None
location during the evaluation period..
P-0I
Turbidity
• Turbidity in stream likely due to factors other
• None
than contaminated groundwater.
• pH and Dissolved Oxygen in stream likely due
to factors other than contaminated groundwater.
pH, Dissolved
• The naturally occurring background
Oxygen, Iron,
concentrations for iron and manganese are high,
SW-02
Manganese, Cobalt,
therefore no 2B standard violation was observed
• None
Zinc
for iron or manganese at this sampling location.
Wetlands
• One-time 2015 monitoring of location within
complex
wetland complex. Nearby outlet locations are
(between
better options to characterize surface water.
highway and
• Based on analysis of the samples, the 2B
French Broad
S W-03
None
standards were not violated at this sampling
• None
River)
location during the evaluation period.
• pH, Dissolved Oxygen, and Turbidity in stream
pH. Dissolved
likely due to factors other than contaminated
SW-04
Oxygen, Turbidity,
groundwater.
None
Iron, Manganese,
• The naturally occurring background
Cobalt, Selenium
concentrations for iron and manganese are high,
therefore no 2B standard violation was observed
Page 7 of 17

for iron and manganese at this sampling
location.
• 2015 monitoring of location within wetland
complex. Nearby outlet locations are better
options to characterize surface water.
• Based on analysis of the samples, the 2B
SW-11 2012
None
standards were not violated at this sampling
• None
location during the evaluation period.
• Based on analysis of the samples, the 2B
S W-12 2012
None
standards were not violated at this sampling
• None
location during the evaluation period.
• The naturally occurring background
A-01-A
Manganese
concentrations for manganese are high, therefore
• None
no 2B standard violation was observed for
manganese at this sampling location.
• The naturally occurring background
A-01-AA
Manganese
concentrations for manganese are high, therefore
• None
no 2B standard violation was observed for
manganese at this sampling location.
• pH in stream likely due to factors other than
contaminated groundwater.
pH, Manganese,
• The naturally occurring background
Cadmium, Cobalt,
concentrations for manganese are high, therefore
Wetlands
F-03-B
Copper, Nickel,
no 2B standard violation was observed for
• None
complex
Zinc
manganese at this sampling location.
(between
• Short tern monitoring to investigate stormwater
highway and
discharge influence. Standard exceedances not
French Broad
associated with groundwater impacts.
River)
• pH and Turbidity in stream likely due to factors
other than contaminated groundwater.
pH, Turbidity, Iron,
• The naturally occurring background
Manganese,
concentrations for iron and manganese are high,
K-01-A
Mercury, Cadmium,
therefore no 2B standard violation was observed
. None
Cobalt, Copper,
for iron and manganese at this sampling
Nickel, Zinc
location.
• Short term monitoring to investigate stormwater
discharge influence. Standard exceedances not
associated with groundwater impacts.
Page 8 of 17

• Based on analysis of the samples, the 2B
S W-01 2012
None
standards were not violated at this sampling
• None
location during the evaluation period.
• Based on analysis of the samples, the 2B
SW-02 2012
None
standards were not violated at this sampling
• None
location during the evaluation period.
• Based on analysis of the samples, the 2B
SW-03 2012
None
standards were not violated at this sampling
• None
location during the evaluation period.
• Based on analysis of the samples, the 2B
SW-04 2012
None
standards were not violated at this sampling
• None
location during the evaluation period.
• Based on analysis of the samples, the 2B
SW-05_2012
None
standards were not violated at this sampling
• None
location during the evaluation period.
Undetermined
(may flow to
• Based on analysis of the samples, the 2B
French Broad
SW-06_2012
None
standards were not violated at this sampling
• None
River)
location duringthe evaluation period.
• Based on analysis of the samples, the 2B
SW-08 2012
None
standards were not violated at this sampling
• None
location during the evaluation period.
• Based on analysis of the samples, the 2B
SW-09 2012
None
standards were not violated at this sampling
• None
location during the evaluation period.
• Based on analysis of the samples, the 2B
SW-10_2012
None
standards were not violated at this sampling
• None
location during the evaluation period.
• Based on analysis of the samples, the 2B
SW-1 I
None
standards were not violated at this sampling
• None
location during the evaluation period.
• Based on analysis of the samples, the 2B
TD-01
None
standards were not violated at this sampling
• None
location during the evaluation period.
2B Standard(s) — 15A NCAC 02B .0200 Surface Water Quality Standards
EPA NRWQC — Environmental Protection Agency National Recommended Water Quality Criteria
ISTV — In -Stream Target Value
Page 9 of 17

Asheville Steam Station — Surface Water Standards Evaluation Non-Dis ositioned Seeps)
Sample Site
Parameters that Exceed
a 2B Standard, EPA
Comments/Observations
Required Actions for Use in Developing a Surface
NRW C, or ISTV
Water Assessment Plan
• The sampling data that was reviewed was
determined to have been collected prior to or
during the implementation of the SOC;
therefore, no evaluation was performed.
. Per the SOC termination letter dated May 18, 2022,
• On August 14 and 15, 2017, DWR Central
Duke Energy shall continue monitoring and reporting
Office staff along with Winston-Salem
of this seep as established in the SOC until approval
A-01
_
Regional Office staff conducted an evaluation
of the Surface Water Assessment Plan required in
of AOW identified by Duke and Duke's
DEQ's Comprehensive Site Assessment comments
Asheville Plant in Buncombe County. Staff also
dated July 14, 2021.
reviewed notes from previous DWR site visit
. This seep shall be included in the EMP.
(9-28-16), USGS maps, NRCS Soil Survey
maps, and the Jurisdictional Wetlands and
Stream Survey for the site. Staff determined
that this seep was classified as a surface water.
• The sampling data that was reviewed was
determined to have been collected prior to or
during the implementation of the SOC;
therefore, no evaluation was performed.
. Per the SOC termination letter dated May 18, 2022,
• On August 14 and 15, 2017, DWR Central
Duke Energy shall continue monitoring and reporting
Office staff along with Winston-Salem
of this seep as established in the SOC until approval
A-02
_
Regional Office staff conducted an evaluation
of the Surface Water Assessment Plan required in
of AOW identified by Duke and Duke's
DEQ's Comprehensive Site Assessment comments
Asheville Plant in Buncombe County. Staff also
dated July 14, 2021.
reviewed notes from previous DWR site visit
• This seep shall be included in the EMP.
(9-28-16), USGS maps, NRCS Soil Survey
maps, and the Jurisdictional Wetlands and
Stream Survey for the site. Staff determined
that this seep was classified as a surface water.
• The sampling data that was reviewed was
• Per the SOC termination letter dated May 18, 2022,
determined to have been collected prior to or
Duke Energy shall continue monitoring and reporting
B-01
_
during the implementation of the SOC;
of this seep as established in the SOC until approval
therefore, no evaluation was performed.
of the Surface Water Assessment Plan required in
• On August 14 and 15, 2017, DWR Central
DEQ's Comprehensive Site Assessment comments
Office staff along with Winston-Salem
dated July 14, 2021.
Page 10 of 17

C-01
C-02
D-01
Regional Office staff conducted an evaluation
of AOW identified by Duke and Duke's
Asheville Plant in Buncombe County. Staff also
reviewed notes from previous DWR site visit
(9-28-16), USGS maps, NRCS Soil Survey
maps, and the Jurisdictional Wetlands and
Stream Survey for the site. Staff determined
that this seep was classified as a surface water.
The sampling data that was reviewed was
determined to have been collected prior to or
during the implementation of the SOC;
therefore, no evaluation was performed.
On August 14 and 15, 2017, DWR Central
Office staff along with Winston-Salem
Regional Office staff conducted an evaluation
of AOW identified by Duke and Duke's
Asheville Plant in Buncombe County. Staff also
reviewed notes from previous DWR site visit
(9-28-16), USGS maps, NRCS Soil Survey
maps, and the Jurisdictional Wetlands and
Stream Survey for the site. Staff determined
that this seep was classified as a surface water.
The sampling data that was reviewed was
determined to have been collected prior to or
during the implementation of the SOC;
therefore, no evaluation was performed.
On August 14 and 15, 2017, DWR Central
Office staff along with Winston-Salem
Regional Office staff conducted an evaluation
of AOW identified by Duke and Duke's
Asheville Plant in Buncombe County. Staff also
reviewed notes from previous DWR site visit
(9-28-16), USGS maps, NRCS Soil Survey
maps, and the Jurisdictional Wetlands and
Stream Survey for the site. Staff determined
that this seep was classified as a surface water.
The sampling data that was reviewed was
determined to have been collected prior to or
during the implementation of the SOC;
no evaluation was
Page 11 of 17
• This seep shall be included in the EMP.
Per the SOC termination letter dated May 18, 2022,
Duke Energy shall continue monitoring and reporting
of this seep as established in the SOC until approval
of the Surface Water Assessment Plan required in
DEQ's Comprehensive Site Assessment comments
dated July 14, 2021.
This seep shall be included in the EMP.
Per the SOC termination letter dated May 18, 2022,
Duke Energy shall continue monitoring and reporting
of this seep as established in the SOC until approval
of the Surface Water Assessment Plan required in
DEQ's Comprehensive Site Assessment comments
dated July 14, 2021.
This seep shall be included in the EMP.
• Per the SOC termination letter dated May 18, 2022,
Duke Energy shall continue monitoring and reporting
of this seep as established in the SOC until approval
of the Surface Water Assessment Plan required in

• On August 14 and 15, 2017, DWR Central
DEQ's Comprehensive Site Assessment comments
Office staff along with Winston-Salem
dated July 14, 2021.
Regional Office staff conducted an evaluation
• This seep shall be included in the EMP.
of AOW identified by Duke and Duke's
Asheville Plant in Buncombe County. Staff also
reviewed notes from previous DWR site visit
(9-28-16), USGS maps, NRCS Soil Survey
maps, and the Jurisdictional Wetlands and
Stream Survey for the site. Staff determined
that this seep was classified as a surface water.
• The sampling data that was reviewed was
determined to have been collected prior to or
during the implementation of the SOC;
therefore, no evaluation was performed.
Per the SOC termination letter dated May 18, 2022,
• On August 14 and 15, 2017, DWR Central
Duke Energy shall continue monitoring and reporting
Office staff along with Winston-Salem
of this seep as established in the SOC until approval
E-01
_
Regional Office staff conducted an evaluation
of the Surface Water Assessment Plan required in
of AOW identified by Duke and Duke's
DEQ's Comprehensive Site Assessment comments
Asheville Plant in Buncombe County. Staff also
dated July 14, 2021.
reviewed notes from previous DWR site visit
• This seep shall be included in the EMP.
(9-28-16), USGS maps, NRCS Soil Survey
maps, and the Jurisdictional Wetlands and
Stream Survey for the site. Staff determined
that this seep was classified as a surface water.
• The sampling data that was reviewed was
determined to have been collected prior to or
during the implementation of the SOC;
therefore, no evaluation was performed.
• Per the SOC termination letter dated May 18, 2022,
• On August 14 and 15, 2017, DWR Central
Duke Energy shall continue monitoring and reporting
Office staff along with Winston-Salem
of this seep as established in the SOC until approval
F-01
-
Regional Office staff conducted an evaluation
of the Surface Water Assessment Plan required in
of AOW identified by Duke and Duke's
DEQ's Comprehensive Site Assessment comments
Asheville Plant in Buncombe County. Staff also
dated July 14, 2021.
reviewed notes from previous DWR site visit
• This seep shall be included in the EMP.
(9-28-16), USGS maps, NRCS Soil Survey
maps, and the Jurisdictional Wetlands and
Stream Survey for the site. Staff determined
that this seep was classified as a surface water.
F-02
_
• The sampling data that was reviewed was
• Per the SOC termination letter dated May 18, 2022,
determined to have been collected prior to or
Duke Energy shall continue monitoring and reporting
Page 12 of 17

F-03
K-01
during the implementation of the SOC;
therefore, no evaluation was performed.
On August 14 and 15, 2017, DWR Central
Office staff along with Winston-Salem
Regional Office staff conducted an evaluation
of AOW identified by Duke and Duke's
Asheville Plant in Buncombe County. Staff also
reviewed notes from previous DWR site visit
(9-28-16), USGS maps, NRCS Soil Survey
maps, and the Jurisdictional Wetlands and
Stream Survey for the site. Staff determined
that this seep was classified as a surface water.
The sampling data that was reviewed was
determined to have been collected prior to or
during the implementation of the SOC;
therefore, no evaluation was performed.
On August 14 and 15, 2017, DWR Central
Office staff along with Winston-Salem
Regional Office staff conducted an evaluation
of AOW identified by Duke and Duke's
Asheville Plant in Buncombe County. Staff also
reviewed notes from previous DWR site visit
(9-28-16), USGS maps, NRCS Soil Survey
maps, and the Jurisdictional Wetlands and
Stream Survey for the site. Staff determined
that this seep was classified as a surface water.
The sampling data that was reviewed was
determined to have been collected prior to or
during the implementation of the SOC;
therefore, no evaluation was performed.
On August 14 and 15, 2017, DWR Central
Office staff along with Winston-Salem
Regional Office staff conducted an evaluation
of AOW identified by Duke and Duke's
Asheville Plant in Buncombe County. Staff also
reviewed notes from previous DWR site visit
(9-28-16), USGS maps, NRCS Soil Survey
maps, and the Jurisdictional Wetlands and
Stream Survey for the site. Staff determined
that this seep was classified as a surface water.
Page 13 of 17
of this seep as established in the SOC until approval
of the Surface Water Assessment Plan required in
DEQ's Comprehensive Site Assessment comments
dated July 14, 2021.
• This seep shall be included in the EMP.
Per the SOC termination letter dated May 18, 2022,
Duke Energy shall continue monitoring and reporting
of this seep as established in the SOC until approval
of the Surface Water Assessment Plan required in
DEQ's Comprehensive Site Assessment comments
dated July 14, 2021.
This seep shall be included in the EMP.
Per the SOC termination letter dated May 18, 2022,
Duke Energy shall continue monitoring and reporting
of this seep as established in the SOC until approval
of the Surface Water Assessment Plan required in
DEQ's Comprehensive Site Assessment comments
dated July 14, 2021.
This seep shall be included in the EMP.

• The sampling data that was reviewed was
determined to have been collected prior to or
during the implementation of the SOC;
therefore, no evaluation was performed.
. Per the SOC termination letter dated May 18, 2022,
• On August 14 and 15, 2017, DWR Central
Duke Energy shall continue monitoring and reporting
Office staff along with Winston-Salem
of this seep as established in the SOC until approval
Regional Office staff conducted an evaluation
of the Surface Water Assessment Plan required in
M-01
-
of AOW identified by Duke and Duke's
DEQ's Comprehensive Site Assessment comments
Asheville Plant in Buncombe County. Staff also
dated July 14, 2021.
Duke Energy shall visually inspect this location
reviewed notes from previous DWR site visit
periodically to determine if conditions have changed
(9-28-16), USGS maps, NRCS Soil Survey
such that it may warrant DWR staff performing a
maps, and the Jurisdictional Wetlands and
stream evaluation.
Stream Survey for the site. Staff concluded that
this seep was not to be stream and therefore not
subject to the 2B standards.
• The sampling data that was reviewed was
determined to have been collected prior to or
during the implementation of the SOC;
therefore, no evaluation was performed.
• Per the SOC termination letter dated May 18, 2022,
• On August 14 and 15, 2017, DWR Central
Duke Energy shall continue monitoring and reporting
Office staff along with Winston-Salem
of this seep as established in the SOC until approval
N-01
_
Regional Office staff conducted an evaluation
of the Surface Water Assessment Plan required in
of AOW identified by Duke and Duke's
DEQ's Comprehensive Site Assessment comments
Asheville Plant in Buncombe County. Staff also
dated July 14, 2021.
reviewed notes from previous DWR site visit
• This seep shall be included in the EMP.
(9-28-16), USGS maps, NRCS Soil Survey
maps, and the Jurisdictional Wetlands and
Stream Survey for the site. Staff determined
that this seep was classified as a surface water.
• The sampling data that was reviewed was
determined to have been collected prior to or
. Per the SOC termination letter dated May 18, 2022,
during the implementation of the SOC;
Duke Energy shall continue monitoring and reporting
therefore, no evaluation was performed.
of this seep as established in the SOC until approval
• On August 14 and 15, 2017, DWR Central
of the Surface Water Assessment Plan required in
Ponded Water F
-
Office staff along with Winston-Salem
DEQ's Comprehensive Site Assessment comments
dated July 14, 2021.
Regional Office staff conducted an evaluation
. Duke Energy shall visually inspect this location
of AOW identified by Duke and Duke's
Asheville Plant in Buncombe County. Staff also
periodically to determine if conditions have changed
reviewed notes from previous DWR site visit
such that it may warrant DWR staff performing a
9-28-16 , USGS maps, NRCS Soil Survey
stream evaluation.
Page 14 of 17

82EO-01
82EO-02
maps, and the Jurisdictional Wetlands and
Stream Survey for the site. Staff concluded that
this seep was not to be stream and therefore not
subject to the 2B standards.
The sampling data that was reviewed was
determined to have been collected prior to or
during the implementation of the SOC;
therefore, no evaluation was performed.
On August 14 and 15, 2017, DWR Central
Office staff along with Winston-Salem
Regional Office staff conducted an evaluation
of AOW identified by Duke and Duke's
Asheville Plant in Buncombe County. Staff also
reviewed notes from previous DWR site visit
(9-28-16), USGS maps, NRCS Soil Survey
maps, and the Jurisdictional Wetlands and
Stream Survey for the site. Staff determined
that this seep was classified as a surface water.
The sampling data that was reviewed was
determined to have been collected prior to or
during the implementation of the SOC;
therefore, no evaluation was performed.
On August 14 and 15, 2017, DWR Central
Office staff along with Winston-Salem
Regional Office staff conducted an evaluation
of AOW identified by Duke and Duke's
Asheville Plant in Buncombe County. Staff also
reviewed notes from previous DWR site visit
(9-28-16), USGS maps, NRCS Soil Survey
maps, and the Jurisdictional Wetlands and
Stream Survey for the site. Staff determined
that this seep was classified as a surface water.
• The sampling data that was reviewed was
determined to have been collected prior to or
DD-Pipe _ during the implementation of the SOC;
therefore, no evaluation was performed.
• This location has not evaluated to determine if
it is a stream and subject to 2B standards.
Page 15 of 17
Per the SOC termination letter dated May 18, 2022,
Duke Energy shall continue monitoring and reporting
of this seep as established in the SOC until approval
of the Surface Water Assessment Plan required in
DEQ's Comprehensive Site Assessment comments
dated July 14, 2021.
This seep shall be included in the EMP.
• Per the SOC termination letter dated May 18, 2022,
Duke Energy shall continue monitoring and reporting
of this seep as established in the SOC until approval
of the Surface Water Assessment Plan required in
DEQ's Comprehensive Site Assessment comments
dated July 14, 2021.
• This seep shall be included in the EMP.
• Per the SOC termination letter dated May 18, 2022,
Duke Energy shall continue monitoring and reporting
of this seep as established in the SOC until approval
of the Surface Water Assessment Plan required in
DEQ's Comprehensive Site Assessment comments
dated July 14, 2021.
• Duke Energy shall work with DWR's 401 & Buffer
Permitting Branch to determine if this location

constitutes a stream. If it is determined to be a
stream, then it shall be included in the EMP. If it is
determined not to be a stream, then Duke Energy
shall visually inspect this location periodically to
determine if conditions have changed such that it
may warrant DWR staff performing a stream
evaluation.
2B Standard(s) — 15A NCAC 02B .0200 Surface Water Quality Standards
AOW — Area of Wetness
DEQ — North Carolina Department of Environmental Quality
DWR — North Carolina Department of Environmental Quality's Division of Water Resources
EPA NRWQC — Environmental Protection Agency National Recommended Water Quality Criteria
EMP — Effectiveness Monitoring Plan
ISTV — In -Stream Target Value
SOC — Special Order by Consent
The following sample locations were sampled one time for a limited number of constituents of interest. These were not evaluated.
2014007162
2014007178
2014007191
2014007210
AVLLK067
AVLSTR005
AVLSTR054
AVLTD090
2014007163
2014007179
2014007194
2014007211
AVLPOND053
AVLSTR006
AVLSTR056
AVLWTLD008
2014007164
2014007180
2014007199
2014007212
AVLSDO009
AVLSTR007
AVLSTR057
AVLWTLDOIO
2014007165
2014007181
2014007200
2014007235
AVLSDO015
AVLSTR012
AVLSTR060
AVLWTLD058
2014007166
2014007182
2014007201
2014007236
AVLSEEP002
AVLSTR013
AVLSTR061
AVLWTLD059
2014007170
2014007183
2014007202
2014007237
AVLSEEP004
AVLSTR014
AVLSTR063
AVLWTLD062
2014007171
2014007184
2014007203
2014007238
AVLSEEPOII
AVLSTR016
AVLSTR064
AVLWW001
2014007172
2014007185
2014007204
2014007239
AVLSEEP019
AVLSTR017
AVLSTR065
AVLWW055
2014007173
2014007186
2014007205
2014007240
AVLSEEP020
AVLSTR018
AVLTD066
AVLWW069
2014007174
2014007187
2014007206
2014007241
AVLSEEP021
AVLSTR023
AVLTD070
AVLWW072
2014007175
2014007188
2014007207
2014007242
AVLSEEP022
AVLSTR024
AVLTD071
AVLWW076
2014007176
2014007189
2014007208
64EO-01+02
AVLSEEP075
AVLSTR051
AVLTD073
CC-01
2014007177
2014007190
2014007209
1 AVLHPND068
AVLSTR003
AVLSTR052
AVLTD074
K-02
SD-01
The following sample locations were sampled two times for a limited number of constituents of interest. These were not evaluated.
FLF-SW-02 I LF-SW-03
Page 16 of 17

The following sample locations have several sampling events. No location data is provided. These were not evaluated.
N-01 Downstream I Separator Dike
The following sample location was within the 1964 Basin and was not evaluated.
SW-05
The following sample locations had one sample event and were on the opposite side of the French Broad River to the coal ash
impoundment. They each had one sample taken in 2016. They were not evaluated.
SW-100 I SW-101 SW-102 1 SW-103 I SW-104
The followina non-disnositioned seens were not evaluated along with the rationale.
64EO-01
Became permitted outfall during NPDES permit renewal.
64EO-02
Became permitted outfall during NPDES permit renewal.
64EO-03
Became permitted outfall during NPDES permit renewal.
C-03
Flow drains to 64EO-3, the 1964 engineered outfall collection system. This non -constructed seep flows to a
portion of an NPDES wastewater treatments stem.
C-05
Flow drains to 64EO-3, the 1964 engineered outfall collection system. This non -constructed seep flows to a
ortion of an NPDES wastewater treatments stem.
Page 17 of 17

.own
moo -
'
..
LEGEND
• SEEP AND SURFACE WATER SAMPLE LOCATIONS
NPDES OUTFALL LOCATION (APPROXIMATE)
1964ASH BASIN WASTE BOUNDARY
- - FORMER 1982 ASH BASIN WASTE BOUNDARY
- - - COMPLIANCE BOUNDARY
DUKE ENERGY PROGRESS PROPERTY LINE
—310 STREAM AND FLOW DIRECTION (TWT 2016)
FORMER FLUE GAS DESULFURIZATION (FGD) WETLANDS
✓I_;7] WETLAND (TWT 2016)
—SURFACE WATER FLOW DIRECTION
NOTES:
1. THE DEPICTED STREAMS AND WETLANDS DATA WERE APPROVED BYTHE US
ARMY CORPS OF ENGINEERS (USACE) ON MAY 19, 2016 - JURISDICTIONAL
DETERMINATION SAW-2014-00189. TAYLOR WSEMAN AND TAYLOR O WT)
PERFORMED THE SURVEY OF THE FEATURES.
2. ALL BOUNDARIES ARE APPROXIMATE.
3. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY PROGRESS, LLC.
4. AERIAL PHOTOGRAPHY OBTAINED FROM NORTH CAROLINA ONE MAP ON
FEBRUARY 20, 2020. AERIAL DATED JANUARY 1, 2019.
5. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE
PLANE COORDINATE SYSTEM FIPS 3200 (NAD83).
FIGURE 1-2C
SITE LAYOUT MAP - SEEP AND SURFACE WATER
SAMPLE LOCATIONS
2020 COMPREHENSIVE SITE ASSESSMENT UPDATE
ASHEVILLE STEAM ELECTRIC PLANT
ARDEN, NORTH CAROLINA

Attachment 2c
Asheville Steam Electric Plant
Location ID
Location Description
Latitude
Longitude
A-01-A
Upgradient of A-01 AOW location
35.47087000
-82.55259000
A-01-AA
Upgradient of A-0I-A surface water
location
35.46967000
-82.55207000
F-03-B
Downgradient of F-03 AOW location
35.46321000
-82.54694000
FB-01
Upstream of site on French Broad River
35.45752700
-82.54484600
FB-01-A
Boat landing off of Pinner Rd
35.45442000
-82.54762000
FB-02
Downstream of site on French Broad
River
35.47347900
-82.55437700
FB-D/S
French Broad River adjacent to MW-11
35.47348000
-82.55397000
FB-MID
French Broad River between MW-16 and
MW-17
35.46852000
-82.55164000
French Broad
Downstream
French Broad Downstream
35.47309000
-82.55421475
French Broad
Upstream
French Broad Upstream
35.46087000
-82.54694146
K-01-A
Upgradient of K-01 AOW location
35.46366000
-82.54527000
SW-01
Powell Creek
35.47427636
-82.55238588
SW-01_2012
Surface water below 1964 basin near toe
drain
35.46684059
-82.54858215
SW-02
Within French Broad Flood Plain
35.47265718
-82.55322795
SW-02 2012
Surface water near C-02
35.46705287
-82.54849330
SW-03
Within French Broad Flood Plain
35.47173662
-82.55286131
SW-03_2012
Surface water below 1964 basin near toe
35.46759449
-82.54867755
SW-04
Within French Broad Flood Plain
35.46982699
-82.55200135
SW-04 2012
Surface water near K-02
35.46335794
-82.54429095
SW-05 2012
Surface water at 1982 basin toe drain
35.46399117
-82.54478158
SW-06
Southern arm of Lake Julian
35.46254264
-82.53325978
SW-06 2012
Surface water at 1982 basin toe drain
35.46395773
-82.54473777
Page 1 of 4

Attachment 2c
SW-07
Eastern arm of Lake Julian
35.47388006
-82.52658634
SW-07 2012
Surface water below Lake Julian dam
35.47453456
-82.54781245
SW-08 2012
Surface water near M-01
35.46432987
-82.54680475
SW-09 2012
Surface water near M-01
35.46426064
-82.54668758
SW-10 2012
Surface water near M-01
35.46421986
-82.54671862
SW-11 2012
Surface water near D-01
35.46575877
-82.54927121
SW-12 2012
Surface water near C-01
35.46608655
-82.54952340
SW-13 (H1)
Surface water near P-01
35.46196635
-82.54440066
SW-13 2012
Surface water near P-01
35.46196635
-82.54440066
SW -FBI
French Broad upstream of plant
35.45997371
-82.54524381
SW-FB2
French Broad River near CB-05
35.46108790
-82.54651301
SWFBR-01
Beneath Glenn Bridge RD Bridge
35.45506900
-82.54713900
SWFBR-02
Transmission Right -of -Way S of 1982
basin
35.46245500
-82.54782400
SWFBR-03
N/Downstream of SWFBR-02, W of 1964
basin
35.46521000
-82.54981200
SWFBR-04
Upstream of Outfall
35.47356300
-82.55397100
SW-H2
Pond adjacent to New Rockwood Rd
35.46188695
-82.54073795
SW-H3
Surface water along Spring Hill Cir
35.46177499
-82.53979291
SW-I1
Surface water at 404 Glenn Bridge Rd
35.45712991
-82.54439691
SWLJ-01
Adjacent to Settling Pond in Lake Julian
35.47298600
-82.54514000
TD-01
Toe drain at 1964 basin
35.46697288
-82.54843596
P-01
Upstream of I-26 culvert at SW property
corner
35.46185000
-82.54462501
Non-Dispositioned Seeps
A 0l
Non- Constructed Seep. Point of drainage
to French Broad River from
wetland/braided flow west of I-26.
Northernmost sample locations near river.
35.47125300
-82.55291401
A-02
Non- Constructed Seep. Minor seep in
wet area just upstream of A-01.
35.47115500
-82.55259601
Page 2 of 4

Attachment 2c
Channeled flow drains toward A-0I
location.
Non- Constructed Seep. Point of drainage
B-01
to French Broad River from
35.46859500
-82.55141801
wetland/braided flow west of I-26 and
south of A-01.
Non- Constructed Seep. Point of drainage
C-01
to French Broad River from
35.46604200
-82.54970101
wetland/braided flow west of 1-26 and
south of B-01.
Non- Constructed Seep. Monitoring
location of UT below 1964 Ash Basin for
C-02
effects of general area seepage; site is
35.46689100
-82.54865101
located just east of culvert under I-26.
Stream flow is conveyed into wetland area
draining toward C-01 location.
Non- Constructed Seep. Seep to
D-01
established channel within wetlands west
35.46601300
-82.54958401
of I-26. Channel flows to C-01 location.
Non- Constructed Seep. Point of drainage
E-01
to French Broad River from
35.46506100
-82.54944001
wetland/braided flow west of I-26 and
south of C-01 drainage.
Non- Constructed Seep. Point of drainage
F-01
to French Broad River from
35.46358100
-82.54854001
wetland/braided flow west of I-26 and
south of E-01 drainage.
Non- Constructed Seep. Point of drainage
F-02
to French Broad River from
35.46253300
-82.54749901
wetland/braided flow west of I-26 and
south of F-01 drainage.
Non- Constructed Seep. Monitoring
location within wetland area west of I-26,
F-03
at outlet of culvert under 1-26. May be
35.46311400
-82.54717701
remnant beaver pond. Flows toward F-01
location, then to French Broad River.
Non- Constructed Seep. Monitoring
location of UT below the 1982 Ash Basin
K-01
dam, just east of culvert under I-26,
35.46305100
-82.54575101
conveying flow to wetlands west of I-26.
Flows drain through wetlands past
Noe 3 of 4

Attachment 2c
locations. F-03 and F-01 before entering
French Broad River.
Non- Constructed Seep. Monitoring
location for coalescence of seep flows
M-01
prior to entering culvert under I-26. Flow
35.46426600
-82.54671201
drains through wetlands to sampling
location F-0I before entering French
Broad River.
Non- Constructed Seep. Seep to small
N-01
channel upstream of its confluence with
35.47408800
-82.55153201
Powell Creek.
Ponded Water
Non- Constructed Seep. Ponded water
F
near dry channel between locations B-01
35.46723200
-82.55052101
and C-01.
Non- Constructed Seep. Western drain
82EO-01
(Drain 1) from 1982 ash basin. Basin has
35.46405800
-82.54484801
been excavated and repurposed. Any flow
would drain to K-0I and F-0I locations.
Non- Constructed Seep. Eastern drain
(Drain 2) from 1982 ash basin; east weir.
82EO-02
Basin has been excavated and repurposed.
35.46405800
-82.54484801
Any flow would drain to K-0I and F-01
locations.
French drain below divider dike between
'64 and past'82 basin. Flow is into former
DD -Pipe
1982 basin footprint which was recently
35.466724
-82.544403
removed from the NPDES permit. Flow
would drain toward M-01 location and
then to sample point at F-01.
Page 4 of 4

Attachment 15
General Surface Water OualW Requirements Applicable to All Facilities
For all surface water sampling locations required to be included in the facility Interim Monitoring
Plan(II M or Effectiveness Monitoring Plan (EMP) (whichever is applicable), the locations shall:
a. be sampled, at a minimum, for the approved site -specific groundwater constituents of interest
per the IMPS or EMPs;
b. be sampled on a frequency to be approved by the North Carolina Department of
Environmental Quality (DEQ) Division of Water Resources (DWR) Regional Office;
c. be sampled using an appropriate methodology as approved by the DEQ DWR Regional
Office (see note 5 below); and
d. include at least one appropriate background location that is sampled for the same approved
parameters and at the same approved frequency (note that a background location may be
appropriate for multiple downstream locations).
2. For all surface water sampling locations, including areas of wetness, not required to be included in
the facility UVIP or EMP:
a. Duke Energy shall determine if the location is appropriate for inclusion in the facility HAP or
EMP and propose any of those locations to the applicable DEQ DWR Regional Office for
approval;
b. All surface water sampling points shall be sampled, at a minimum, for the approved site -
specific groundwater constituents of interest per the IMPS or EMPs and include at least one
appropriate background location that is sampled for the same approved parameters and at the
same approved frequency (note that a background location may be appropriate for multiple
downstream locations); and
c. All proposed sample locations, parameters to be monitored, sampling methodologies (see
note 5 below), and sampling frequencies shall be approved by the applicable DEQ DWR
Regional Office prior to inclusion in the PAP or EMP.
3. All surface water sampling events shall include:
a, sampling for hardness and turbidity, and
b. analysis for both total and dissolved metals to determine compliance with 15A NCAC 02B
standards, including hardness -based metals compliance.
4. For all surface water locations, including areas of wetness, not proposed or required to be included in
the IMPS or END Duke Energy may discontinue sampling unless otherwise directed by DEQ.
DEQ may require additional periodic sampling to determine compliance with the 15A NCAC 02B
.0200 surface water standards or to evaluate site conditions or the effectiveness of the remedial
strategy as excavation and/or closure of the basins progress.
5. Grab sampling for surface water parameters is acceptable for monitoring purposes. However, DEQ
may require chronic/acute sampling to determine compliance with 15A NCAC 02B .0200 surface
water standards. This will depend on factors such as the concentrations observed and data trends.
Please refer to DEQ's Internal Technical Guidance: Evaluating Impacts to Surface Water from
Page 1 of 2

Discharging Groundwater Plumes memorandum dated October 31, 2017, and 15A NCAC 02B
.0211(11).
6. Any streams that may reform within the limits of an excavated coal ash impoundment will require
consultation with DEQ on a case -by -case basis to determine the proper course of action.
7. When a facility's NPDES permit is proposed for termination, Duke Energy and the DEQ DWR
Regional Office shall meet prior to its termination to discuss the appropriate next steps regarding any
surface water locations and any non-dispositioned seeps that may have been sampled per the NPDES
permit.
8. For all seeps that do not have stream classifications and continue to exhibit flow, Duke Energy shall
request stream determinations from the DEQ DWR's 401 & Buffer Permitting Branch. If they are
detemuned to be streams, then they shall be included in the facility IMP or ENV (whichever is
applicable). If they are determined not to be streams, then Duke Energy may discontinue their
sampling unless otherwise directed.
9. For all seeps that stop exhibiting flow, Duke Energy shall propose a methodology for their
dispositioning.
10. Please note that for any surface water location(s) requiring corrective actions due to coal combustion
residual contamination, natural attenuation will not be permitted per 15A NCAC 02L
.0111(dx10)(F).
Page 2 of 2

From: Healy. Ashley Lisbeth
To: Camobell, Ted
Cc: Davidson. Landon; Smith, Eric G; Toepfer, John R; Hardin, Tyler; Sullivan. Ed M; Safrit. Don; Williams. Teresa
Lynne; Kelly Ferri
Subject: Asheville - Surface Water Assessment Flan
Date: Tuesday, April 4, 2023 3:47:16 PM
Attachments: Asheville Surface Water Assessment Plan Final 04-04-2023.odf
g.f -1
On January 9, 2023, Duke Energy received a Surface Water Evaluation letter from the NCDEQ for 14
Duke Energy facilities, including the Asheville :team Bectric Rant. This letter provided the surface
water assessment guidance referenced in the 2021 CEA Update - Comments Pevised letter and
conditional approval. The letter stated that within 90 days of receipt, Duke Energy shall submit a
Surface Water Assessment Ran (S/VAP). The requested Asheville SNAP is attached to this email for
NCDEQ review and approval.
Please let me know if you have any questionswith this submittal.
Ibspec tfully,
Ashley
Ashley L Healy, PG
Waste and Groundwater Programs
Mobile: [phone]

Terra Science &Engineering Consultants
synterracorp.com
SURFACE WATER ASSESSMENT PLAN - APRIL 2023
ASHEVILLE STEAM ELECTRIC PLANT
1.0 BACKGROUND
On January 9, 2023, Duke Energy received a Surface Water Evaluation letter (letter) from the
North Carolina Department of Environmental Quality (NCDEQ) for 14 Duke Energy facilities,
including the Asheville Steam Electric Plant (Asheville or Site) (Figure 1). Per the Comprehensive
Site Assessment comment letter for Asheville dated July 14, 2021 (NCDEQ 2021), NCDEQ
stated that it would provide additional comments and direction regarding surface water in an
upcoming separate correspondence. The January 9, 2023, letter satisfied that comment and
provided Duke Energy with a surface water evaluation to assist with the preparation of this
Surface Water Assessment Plan (SWAP). The letter stated that within 90 days of receipt, Duke
Energy shall use the information provided to develop a SWAP.
2.0 SURFACE WATER SAMPLE LOCATIONS, FREQUENCY, AND METHODOLOGY
The following surface water locations are proposed in the January 9, 2023, letter to be
monitored at the Site:
• A-01 • C-01 • E-01 • F-03 • 82EO-01
• A-02 • C-02 • F-01 • K-01 • 82EO-02
• B-01 • D-01 • F-02 • N-01 (aka N-01
downstream)
The locations are presented on Figure 2 and descriptions of the monitoring locations are
included on Table 1. N-01 nomenclature changed to N-01 Downstream in November 2018 and
remains the same sample location as N-01 presented in the NCDEQ Surface Water Evaluation
Letter dated January 9, 2023. N-01 Downstream will continue to be the identification name for
this location.
Locations A-01, B-01, C-01, F-01, and F-02 are downgradient surface water monitoring locations
previously approved by NCDEQ as representative of water quality at upgradient monitoring
locations. Location E-01 was identified by NCDEQ to be sampled and is included as such.
Monitoring locations A-02, C-02, F-03, K-01, 82EO-01, and 82EO-02 were identified by NCDEQ
to be sampled; however, those locations will be sufficiently monitored by sampling at the
downstream sampling points.
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Surface Water Sampling Assessment Plan — April 2023
Asheville Steam Electric Plant
Page 2 of 7
Those locations and their associated downstream sampling locations are described below:
• A-02 is located upgradient of A-01 within the same channel. Sample location A-01 is
representative of water quality at A-02.
• Drainage from C-02 flows downgradient to sample location C-01. Sample location C-01 is
representative of water quality at C-02.
• Drainage from F-03 flows northwest and converges into the channel where sample
location F-01 is located. Drainage from K-01 flows west, past location F-03 and
converges into the channel where sample location F-01 is located. Sample location F-01
is representative of water quality at F-03 and K-01.
• Constructed seeps 82EO-01 and 82EO-02 are located beneath the former 1982 Ash
Basin and drain southwest of K-01, into the channel where sample location F-01 is
located. Sample location F-01 is representative of water quality at 82EO-01 and
82EO-02.
The former 1964 Ash Basin toe drains discharge into the National Pollutant Discharge
Elimination System (NPDES) permitted outfall 101 (Figure 2). Outfall 101 discharges into an
unnamed tributary where C-01 and C-02 surface water locations are located. Location C-01 has
routinely been used as the representative downgradient monitoring location for flows from C-
02 and D-01. Sampling at C-01 will be discontinued until NPDES outfall 101 is removed because
of the downgradient proximity to a permitted wastewater discharge. Sampling at location D-01
will be conducted in the interim. Sampling at C-01, the representative downgradient monitoring
location for flows from C-02 and D-01, would resume once the NPDES outfall has been
removed. Location D-01 will be transition to an observation location at this time.
Duke Energy proposes to collect surface water samples from the following additional locations
(Figure 2):
• FB Upstream — background location in the French Broad River
• FB Downstream — downstream location in the French Broad River
• SW-06 —background location in an unnamed tributary that flows into Lake Julian
Duke Energy proposes semiannual collection of surface water samples A-01, B-01, C-01, E-01, F-
01, F-02, and N-01 Downstream within the same quarter as the groundwater monitoring events
per the current groundwater monitoring plan. Monitoring of background and the French Broad
River locations will be conducted during the semiannual collection of downgradient surface
water samples. Surface water samples will be collected as grab samples using Duke Energy
Water Chemistry Sampling Procedure ESFP-SW-0504 protocol (Duke Energy, 2020) and field
water quality parameters will be evaluated using Duke Energy Water Quality Field Procedure
protocol (Duke Energy, 2022).
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Surface Water Sampling Assessment Plan — April 2023 Page 3 of 7
Asheville Steam Electric Plant
3.0 SAMPLING AND OBSERVATION
3.1 Surface Water Sample Analysis
In the General Surface Water Quality Requirements Applicable to All Facilities provided in the
letter, NCDEQ stated that surface water samples collected for analysis shall be analyzed for, at a
minimum, the approved Site -specific groundwater constituents of interest (COls) per the
current groundwater monitoring plan [Interim Monitoring Plan (IMP), Effectiveness Monitoring
Plan (EMP), or Optimized Monitoring Plan (OMP)]. Currently at Asheville there are separate COI
lists for different source areas at the site (1964 ash basin, 1982 ash basin and the former coal
pile) in the groundwater Corrective Action Plan (Arcadis, 2022). Therefore, the surface water
samples will be analyzed for the list of constituents provided on Table 2, which represents a
compilation of COls associated with the various source areas, including total and dissolved
analysis as noted, plus any additional constituents required for calculating total hardness.
Surface water samples would not be analyzed for the additional water quality parameters or
additional voluntary parameters listed on the current groundwater monitoring plan.
The surface water sample and observation locations included in this SWAP will be incorporated
into the current groundwater monitoring plan. Following approval of an OMP or EMP for the
Site, the list of surface water sample analytes may be updated to reflect the revised COls for the
Site.
3.2 Seep Observations
NCDEQ concluded that seep locations Ponded Water F and M-01 are not considered
jurisdictional streams. Duke Energy believes that DD-Pipe does not represent jurisdictional
waters; flow from DD-pipe does not reach waters of the U.S. Therefore, Ponded Water F, M-01
and DD-Pipe are included as observation locations in this SWAP (Table 1). Surface water sample
locations to be monitored at downgradient locations (A-02, C-02, F-03, K-01, 82EO-01, and
82EO-02) are included as observation locations in this SWAP. The seep locations will be
observed semiannually in conjunction with the surface water sampling. If changes in conditions
are observed (such as increased in flow rate, etc.), Duke Energy will notify the NCDEQ.
4.0 REPORTING, EVALUATION, AND DISPOSITIONING
The surface water monitoring data and observation descriptions will be presented and
evaluated in the Annual Groundwater and Surface Water Monitoring Reports and
comprehensive data tables submitted to the NCDEQ quarterly. The surface water monitoring
data will be compared to applicable 02B standards; USEPA Nationally Recommended Water
Quality Criteria and North Carolina In -Stream Target Values for Surface Waters will be provided
for informational purposes.
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Surface Water Sampling Assessment Plan — April 2023 Page 4 of 7
Asheville Steam Electric Plant
USEPA Nationally Recommended Water Quality Criteria
USEPA recommended criteria are not water quality standards because they have not
been adopted through rulemaking and they have not been approved by USEPA in the
triennial review process. Moreover, the NCDEQ DWR does not consider them to be
standards, as reflected in the Surface Water Quality Standards, Criteria & Protective
Values spreadsheet, which states, on the USEPA criteria tab, "Below are all Nationally
Recommended Water Quality Criteria for which North Carolina does not have a Water
Quality Standard for one or more uses."
Iron and manganese were specifically removed from 15A NCAC 02B regulations in 2015.
During the proceeding review process, it was concluded that, "North Carolina further
believes that removal of the standard [iron] from the current 15A NCAC 02B regulations
will not cause any adverse effects on water quality and on any designated uses." As for
manganese, the "Division of Water Resources has no evidence to conclude that
discharges of manganese will impact any beneficial uses of North Carolina's waters."
Therefore, "the Environmental Management Commission (EMC) and the Rules Review
Commission (RRC), after public notice and review, approved removal of the water
quality standards for both iron and manganese."
Comparisons with the USEPA National Recommended Water Quality Criteria will be
included within Duke Energy's Annual Groundwater and Surface Water Report. As
stated by the USEPA, these criteria are not a regulation, nor do they impose a legally
binding requirement. Therefore, comparisons with these criteria are only for situational
context. The constituents that have corresponding USEPA criteria but do not have
NCDEQ 02B criteria are alkalinity, aluminum, antimony, iron, and manganese.
Alkalinity
The alkalinity criteria are a minimum value established by the USEPA over 30
years ago. It is a measure of the buffering capacity of the water as related to pH
and the association of pH and complexing materials with the toxicity of certain
pollutants such as certain metals and ammonia. In more recent times these
pollutants have the effects of pH (and hardness) constructed into the
establishment of the criteria value. Alkalinity is an artifact of past efforts of
criteria development.
Aluminum
Aluminum is ubiquitous. It is the third most abundant element and the most
common metal in the earth's crust. Aluminum enters the aquatic environment
predominantly from natural sources. This is due to the abundance of aluminum
in rocks and soils released by weathering. The USEPA expressed the aluminum
criterion as total recoverable aluminum. However, natural water samples may
also contain other species of aluminum that are not biologically available (i.e.,
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Surface Water Sampling Assessment Plan — April 2023
Asheville Steam Electric Plant
Page 5 of 7
suspended particles, clays, and aluminosilicate minerals). This creates
uncertainty because the total recoverable aluminum concentrations measured in
natural waters may overestimate the potential risks of toxicity to aquatic
organisms.
Antimony
Antimony was rarely detected in historical Duke Energy studies. Any detections
were well below the USEPA criteria of 640 ug/I for the Human Health criteria.
Iron and Manganese
Iron and manganese criteria were both withdrawn from the NCDEQ 02B
regulation in the last triennial review. The iron criteria of 1,000 ug/I, based on
USEPA's aquatic life value, was withdrawn in North Carolina due to the
determination that the value was unnecessary and potentially overly protective.
North Carolina further stated that they believed that removal of the standard
from the current 15A NCAC 02B regulations will not cause adverse effects on
water quality and on any designated uses. Manganese was likewise withdrawn
from the 02B regulation. Manganese criteria were based on Human Health
aspects, but the NCDEQ could not determine that the USEPA values provided any
human health protective benefit for North Carolina.
North Carolina In -Stream Target Values for Surface Waters
In -Stream Target Values are calculated according to the instructions in 15A NCAC
0213.0208. Although calculated according to regulation, the numeric derivations of the
narrative standard in .0208 have not themselves been adopted into regulation. As such
the published values may be recalculated from time to time based on new research or
by further evaluation of existing sources. Duke Energy will provide comparisons against
published In -Stream Target Values with the qualification that an exceedance of the
published value is not necessarily or automatically a violation of the water quality
standard for toxicity and that further review may be required to confirm that the
published value complies with .0208.
Historical Duke Energy surface water sample results, as well as results of other media,
including groundwater, are summarized in comprehensive data submittal spreadsheets
that Duke Energy routinely submits to NCDEQ.
In accordance with NCDEQ's January 9, 2023, letter, surface water samples will be collected as
grab samples. The 02B standards based on acute and chronic toxicity are not applicable to
constituent concentrations reported from grab sampling. Calcium and magnesium analysis
would be conducted to facilitate total hardness calculations for each sample. Dissolved analysis
would be conducted for those constituents that have 02B standards based on the dissolved
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Surface Water Sampling Assessment Plan — April 2023
Asheville Steam Electric Plant
Page 6 of 7
fraction; however, those dissolved and hardness -dependent 02B standards would not be
applicable to the sampling method.
Surface water sampling at the downstream locations will continue until:
• COI concentrations in those downstream surface water locations are less than
applicable comparison criteria in 15A NCAC 02B .0211 through .0255 or less than
concentrations observed at background locations for two consecutive monitoring
events,
or
• Sample locations become dry, stagnant, exhibit insufficient flow for sampling, or the
locations are otherwise unable to be sampled for two consecutive monitoring events.
Seep observations will continue until:
• The seep location becomes dry, does not flow to surface water, or is inundated for two
consecutive monitoring events,
or
• The seep is otherwise dispositioned,
or
• The COI concentrations in downstream surface water sampling locations are less than
applicable comparison criteria in 15A NCAC 02B .0211 through .0255 or concentrations
observed at background locations for two consecutive monitoring events.
Seep locations will be considered dispositioned if seeps are observed to be dry, not flowing to
surface waters, or inundated for two consecutive monitoring events.
Once downstream surface water sampling locations demonstrate compliance with applicable
comparison criteria in 15A NCAC 02B .0211 through .0255 for two consecutive monitoring
events, and seep observations have not indicated changing conditions, surface water sampling
(including background locations) and seep observations at the Site will cease, and the seeps will
be considered dispositioned.
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Surface Water Sampling Assessment Plan — April 2023
Asheville Steam Electric Plant
ATTACHMENTS
Figure 1— Site Location Map
Figure 2 —Surface Water Sampling Locations
Table 1— Surface Water Sampling and Seep Locations Descriptions
Table 2 — Summary of Constituents and Analytical Methods
REFERENCES
Page 7 of 7
Arcadis (2022). Corrective Action Plan Update —Asheville Steam Electric Plant November 18,
2022.
Duke Energy (2016). Standard Operating Procedure for Seep Sampling, ADMP-ENV-EHS-00002,
Revision 0, March 24, 2016.
Duke Energy (2020). Water Chemistry Sampling Procedure, ESFP-SW-0504, Revision 0,
January 1, 2020.
Duke Energy (2022). Water Quality Field Procedure, ESFP-SW-0503, Revision 2,
January 1, 2022.
NCDEQ (2021). 2020 Comprehensive Site Assessment Update - Comments, Asheville Steam
Electric Plant, July 16, 2021.
synterracorp.com

FIGURES
tip
synTerra
Science & Engineering Consultants

U
NOTES:
I ALL BOUNDARIES ARE APPROXIMATE
2 PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY PROURESS
J USGS TOPOGRAPHIC MAP. OBTAINED FROM THE ESRI. LAST UPDATED
JUNE 2022
t`:IDUKE
ENERGY
BUNCOMBE
COUNTY Aa
PROGRESS
�wnu
.y•
f � s
-r , i
1 II
-•
RETIRED ASHEVILLE �•
STEAM ELECTRIC PLANT
•r
% r
•
FORMER COAL PILE
,
1982
ASH BASIN
i
WASTE BOUNDARY
•
DUKE ENERGY PROGRESS
•� 1 • •
PROPERTY BOUNDARY
_
ASHEVILLE COMBINED
"*I
CYCLE STATION
FIGURE i
SITE LOCATION MAP
SURFACE WATER ASSESSMENT PLAN
ASHEVILLE STEAM ELECTRIC PLANT
ARDEN, NORTH CAROLINA
Nl 1. nr
f)UIYIHY 1 MAII vf c.,
f3V-A[)F` f 'RC4W"tl. Alf
I HN wf.. H1 K IfAQ, UHE ^) 1, t_'11
AM"til ll.f% K 1I 4HI [Alf n2 22 207, ❑t�ff,7
PRU SELF AfUAUR K II RRI

NPDESr..
OUTFALL 001 • r ". �' • �,� n
arol
:..:i
..
OL
IL
f
t LEGEND
tip. j H
e. ■ SURFACE WATER SAMPLE LOCATION
BACKGROUND SURFACE WATER SAMPLE LOCATION
. ' • (/fir r'�¢� • SEEP OBSERVATION LOCATION
NP'44- . • (.i<Y — 1964 ASH BASIN WASTE BOUNDARY
j `x""'• s- - t • ` ' F S - 1982 ASH BASIN WASTE BOUNDARY
V � ~ � , 4 �'4' � • '• -DUKE ENERGY PROGRESS PROPERTY BOUNDARY
t ' `' •' --► SURFACE WATER FLOW DIRECTION
1 ,�..: - • ~� • ; --►- STREAM (TWT 2016)
a . -_ - `' • WETLAND (TWT 2016)
LN �. a ^ • NOTES:
t
• ! .000, •• ^� • •� 1 • - TEMPORARILY MONITOR D-01 UNTIL MONITORING AT THE DOWNGRADIENT
.�� ' � � •ern• SAMPLE LOCATION C-01 RESUMES.
�R 2 ^ - TEMPORARILY DISCONTINUE MONITORING AT C-01 UNTIL NPDES PERMITTED
^ • OUTFALL 101 HAS BEEN REMOVED.
3 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)
Y 1,- •i • _ 4. THE STREAMS AND WETLANDS JURISDICTIONAL DETERMINATION WAS
' "'� ` • . PERFORMED BY TAYLOR WISEMAN AND TAYLOR ` ,, 5�,,_[>6 (TWi)AND ASSIGNED USACE
a w #SAW-201100189. THESE WETLANDS AND STREAMS WERE APPROVED BY THE US
ARMY CORPS OF ENGINEERS (USACE I ON MAY 16. 2016
+; u • `, \ �, • 5 ALL LOCATIONS AND BOUNDARIES ARE APPROXIMATE.
• '+ . •� • - ' 6. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY PROGRESS. LLC
_ 7 ►
F9-UPSTR •!' ' {'' `� 7. AERIAL IMAGERY IS A COMBINATION OF DUKE ENERGY PROPELLER AERIAL
r� • PHOTOGRAPHY COLLECTED ON JANUARY 23, 2023 AND GOOGLE EARTH AERIAL
R s PHOTOGRAPHY COLLECTED ON OCTOBER 17. 2021.
'.' , '•• ° }• `' ` A .H. •+" X'; •"..' }z: , 8. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE
'� K ,�,. �•� PLANE COORDINATE SYSTEM FIPS 3200 (NAD83)
350 i r}_
'DUKE . j %,•, r �,a , j� .yam FIGURE 2
- E N E R G Y GRAPHIC SCALE IN FEET
_ ;.. SURFACE WATER SAMPLE LOCATIONS
• `: t"n PROGRESS DRAIN%BY E OROEMANN DATE 02.222023 SURFACE WATER ASSESSMENT PLAN
' :i. " �'' , •k ., REVISED BY E ORDEAIA%% DATE OV31/2023
CHECKED BY. K FERRI DATE. 03, 31,'2023 ASHEVILLE STEAM ELECTRIC PLANT
~`•0� +'?I�y# i APPROVED BY K FERRI LATE 03.3�2023 ARDEN, NORTH CAROLINA
PROJECT MANAGER K FERRY
i y �� Wr'w.SyrHErracorD com

TABLES
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synTerra
Science & Engineering Consultants

TABLE 1
SURFACE WATER SAMPLING AND SEEP LOCATION DESCRIPTIONS
SURFACE WATER ASSESSMENT PLAN
ASHEVILLE STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, ASHEVILLE, NC
Location
Classification
Description
Surface Water Sample Locations
Point of drainage from wetlands northwest of the former 1964 ash basin to the French Broad River. NCDEQ determined this
A-01
Class B
location is classified as surface water and subject to the 02B standards.
Point of drainage from wetlands west of the former 1964 ash basin to the French Broad River. NCDEQ determined this
B-01
Class B
location is classified as surface water and subject to the 02B standards.
Point of drainage west of the former 1964 ash basin to the French Broad River. NCDEQ determined this location is classified as
C-01
Class B
surface water and subject to the 02B standards. Temporarily discontinue sampling at C-01 because of the downgradient
proximity to a permitted wastewater discharge. Sampling at C-01 would resume once NPDES outfall 101 has been removed.
Point of drainage from wetlands towards surface water sample location C-01. NCDEQ determined this location is classified as
D-01
Class B
a surface water. Temporarily monitor D-01 until monitoring at C-01 resumes.
Point of drainage southwest of the former 1964 ash basin toward the French Broad River. NCDEQ determined this location is
E-01
Class B
classified as surface water and subject to the 02B standards.
Point of drainage from wetlands west of the former 1982 ash basin to the French Broad River. NCDEQ determined this
F-01
Class B
location is classified as surface water and subject to the 02B standards.
Point of drainage from wetlands southwest of the former 1982 ash basin to the French Broad River. NCDEQ determined this
F-02
Class B
location is classified as surface water and subject to the 02B standards.
Seep to small channel north of the former 1964 ash basin that flows into Powell Creek. NCDEQ determined this location is
N-01 Downstream'
Class C
classified as surface water and subject to the 02B standards.
FB Downstream
Class B
Downstream location in the French Broad River.
FB Upstream
Class B
Upstream location in the French Broad River.
SW-06
Class C
Upstream location in an unnamed tributary that flows into Lake Julian.
Seep Observation Locations
Point of drainage from former 1982 ash basin towards F-01. NCDEQ determined this location is classified as a surface water.
82E0-01
Class B
Monitoring for 82EO-01 will be collected at downgradient sample location F-01.
Point of drainage from former 1982 ash basin towards F-01. NCDEQ determined this location is classified as a surface water.
82E0 02
Class B
Monitoring for 82EO-02 will be collected at downgradient sample location F-01.
Point of drainage towards surface water sample location A-01. NCDEQ determined this location is classified as a surface
A-02
Class B
water. Monitoring for A-02 will be collected at downgradient sample location A-01.
e1of2

TABLE 1
SURFACE WATER SAMPLING AND SEEP LOCATION DESCRIPTIONS
SURFACE WATER ASSESSMENT PLAN
ASHEVILLE STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, ASHEVILLE, NC
Location
Classification
Description
Point of drainage towards surface water sample location C-01. NCDEQ determined this location is classified as a surface water.
C-02
Class B
Monitoring for C-02 will be collected at downgradient sample location C-01. However, temporarily discontinue sampling at C-
01 because of the downgradient proximity to a permitted wastewater discharge.
Point of drainage from wetlands toward surface water sample location F-01. NCDEQ determined this location is classified as a
F-03
Class B
surface water. Monitoring for F-03 will be collected at downgradient sample location F-01.
Point of drainage from wetlands toward surface water sample location F-01. NCDEQ determined this location is classified as a
K-01
Class B
surface water. Monitoring for K-01 will be collected at downgradient sample location F-01.
NCDEQ determined this location to be a seep and not classified as surface water; therefore, it is not subject to the 02B
M-01
NA
standards. However, NCDEQ requested that this location be observed periodically to determine if conditions have changed.
French drain below divider dike between the former 1964 and 1982 ash basins. Due to closure of the former 1964 ash basin
DD-Pipe
NA
only minimal flow has been observed. Duke Energy believes that DD-Pipe does not represent jurisdictional waters; therefore,
it is included as an observation location in this SWAP.
NCDEQ determined this location to be a seep and not classified as surface water; therefore, it is not subject to the 02B
Ponded Water F
NA
standards. However, NCDEQ requested that this location be observed periodically to determine if conditions have changed.
Prepared by: KHF Checked by: TJG
Notes:
NA - Not applicable
' - N-01 nomenclature changed to "N-01 Downstream" in November 2018. Sample location remains the same as N-01 presented in the SOC and the NCDEQ Surface Water Evaluation Letter dated January 9,
2023.
NPDES - National Pollutant Discharge Elimination System
SWAP - surface water assessment plan
Page 2 of 2

TABLE 2
SUMMARY OF CONSTITUENTS AND ANALYTICAL METHODS
SURFACE WATER ASSESSMENT PLAN
ASHEVILLE STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, ARDEN, NC
Constituent
Units
Analytical Methods
In Situ Parameters
Field pH
Standard units
Multi -Parameter Water Quality Meter
Field Specific Conductance
µ0/cm
Multi -Parameter Water Quality Meter
Field Temperature
degrees Celsius
Multi -Parameter Water Quality Meter
Field Dissolved Oxygen
mg/L
Multi -Parameter Water Quality Meter
Field Oxidation Reduction Potential
mV
I Multi -Parameter Water Quality Meter
Field Turbidity
NTU
Turbidimeter
Laboratory Analyses
Aluminum
µg/L
EPA 200.7
Arsenic^
µg/L
EPA 200.8
Beryllium^
µg/L
EPA 200.8
Boron
µg/L
EPA 200.7
Cadmium
µg/L
EPA 200.8
Cobalt
µg/L
EPA 200.8
Iron
µg/L
EPA 200.7
Lithium
µg/L
EPA 200.8
Magnesium#
µg/L
EPA 200.7
Manganese
µg/L
EPA 200.7
Molybdenum
µg/L
EPA 200.8
Nickel
µg/L
EPA 200.8
Selenium
µg/L
EPA 200.8
Strontium
µg/L
EPA 200.7
Sulfate
mg/L
EPA 300.0
Thallium
µg/L
EPA 200.8 (low level)
Total Dissolved Solids
mg/L
SM 2540C-2015
Total Radium
pCi/L
EPA 903.1 (Radium-226) and EPA 904.0 (Radium-228)
Total Uranium
µg/mL
EPA 6020E
Vanadium
µg/L
EPA 200.8 (low level)
Zinc^
µg/L
EPA 200.7
Prepared by: KHF Checked by: TWL
Notes:
Constituent will be analyzed for total recoverable metals (TRM) and dissolved concentrations.
"- Magnesium is not a constituent of interest in groundwater at the Site; however, magnesium analysis is required to calculate total hardness.
Total Hardness = 2.497 (calcium) + 4.118 (magnesium)
µf)/cm - micro -ohms per centimeter
µg/L - micrograms per liter
mg/L - milligrams per liter
µg/mL - micrograms per milliliter
pCi/L - picocuries per liter
Page 1 of 1

From: Healy. Ashley Lisbeth
To: Camobell, Ted
Cc: Davidson. Landon; Smith, Eric G; Toeofer, John R: Hardin. Tyler; Sullivan. Ed M; Safrit. Don; Williams. Teresa
Lynne; Kelly Ferri
Subject: Asheville - Surface Water Assessment Plan
Date: Tuesday, April 4, 2023 3:47:16 PM
Attachments: Asheville Surface Water Assessment Plan Final 04-04-2023.odf
Ted —
On January 9, 2023, Duke Energy received a Surface Water Evaluation letter from the NCDEQfor 14
Duke Energy facilities, including the Asheville Steam Electric Plant. This letter provided the surface
water assessment guidance referenced in the 2021 CSA Update - Comments Revised letter and
conditional approval. The letter stated that within 90 days of receipt, Duke Energy shall submit a
Surface Water Assessment Plan (SWAP). The requested Asheville SWAP is attached to this email for
NCDEQ review and approval.
Please let me know if you have any questions with this submittal.
Respectfully,
Ashley
Ashley L. Healy, P.G.
Waste and Groundwater Programs
Mobile: [phone]

From:
Campbell, Ted
To:
Healy, Ashley Lisbeth
Cc:
Davidson. Landon, Smith, Eric G; Toenfer, John R, Hardin, Tyler, Sullivan. Ed M; Safrit. Don; Williams. Teresa
Lynne; Kelly Ferri, Campbell, Ted
Subject:
[EXTERNAL] Asheville - Surface Water Assessment Plan
Date:
Wednesday, April 26, 2023 10:31:08 AM
Attachments:
mage001.pna
Asheville Surface Water Assessment Plan Final 04-04-2023.0f
Ashley - The Asheville F1.gional office has reviewed the %rfaee Water Assessment Ran for the
Asheville Facility submitted on April 11, 2023, and approves its implementation with the following
comments:
Ste-,9,)ecific Comments
none
General Comments Applicable to Al Facilities
• Duke Energy shall request approval from the Pegional Office prior to dispositioning any seep
based on the proposed criteria. The Regional Office will review the request and may provide
additional conditions or comments based on their determination.
Fegardingthe use of 15ANCACO2B.0202 (213Sandards), USEnvironmental Protection
Agency National Recommended Water Quality Criteria (EPA NRWQC), and In -stream Target
e& L{ �f t s 'rsa'nCn s 5 dal 46■ oz i Aa'n4f of 'r5 i w4 'rkAl' s i Ag'nv j P�
{ CA.r M V / 'rA'r lz {I N V Qk*' Cle 9f { �.r Arr f QNV' f 4 found on the website at
httDs://de .nc. ov/docLimen s/nc-stdstable-07262021 (or the most recent version of this
�� � " Qnrj I'C�.C9l�A - s �'n5i v�if �nl'sff m'nPff�■�ir�-�r�6j f OPC�'nL'or�
classifications, 2Baandards, EPANRWQQ and ISTVs that the gate of North Carolina employs
to protect the designated uses of its surface waters. For the spedfic site waterbody, refer to
the designated uses table when dedding which 2B Elandard, EPA NRWQG or ISTVto apply.
The most sensitive use must be protected. Reported values that exceed the most sensitive
use value shall be flagged.
_%rface water samples proposed in larger waterbodies (e.g.. rivers and lakes) shall be
collected near the bank for the approved Ms.
The Fegional Office reserves the right to request modification the surface water sampling in
the Interim Monitoring Ran or Effectiveness Monitoring Ran (whichever is applicable for the
site) based on the available data, changes in site conditions, or remedial strategy
effectiveness.
Let me know if you have any questions. Thanks.
Ted R Campbell
I t' / o■fj IJ�AC

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ENERGY(IN
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FEEL)
375
PROGRESS
DRAWN BY: C. DAVIS
REVISED BY: C. CURRIER
DATE:03/24/2020
DATE:11/18/2020
Op
CHECKED BY: H. CARTER
DATE:11/18/2020
APPROVED BY: G. BARRIER
DATE:11/18/2020
r7m
PROJECT MANAGER: G. BARRIER
LEGEND
SEEPAND SURFACE WATER SAMPLE LOCATIONS
♦ NPDES OUTFALL LOCATION (APPROXIMATE)
1964ASH BASIN WASTE BOUNDARY
FORMER 1982 ASH BASIN WASTE BOUNDARY
COMPLIANCE BOUNDARY
DUKE ENERGY PROGRESS PROPERTY LINE
)— STREAM AND FLOW DIRECTION (TWT 2016)
I FORMER FLUE GAS DESULFURIZATION (FGD) WETLANDS
ZZZI WETLAND (TWT 2016)
►SURFACE WATER FLOW DIRECTION
NOTES:
1. THE DEPICTED STREAMS AND WETLANDS DATA WERE APPROVED BY THE US
ARMY CORPS OF ENGINEERS (USAGE) ON MAY 19. 2016 -JURISDICTIONAL
DETERMINATION SAW-2014-00189, TAYLOR WISEMAN AND TAYLOR Owr)
PERFORMED THE SURVEY OF THE FEATURES.
2. ALL BOUNDARIES ARE APPROXIMATE.
3. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY PROGRESS, LLC.
4. AERIAL PHOTOGRAPHY OBTAINED FROM NORTH CAROLINA ONE MAP ON
FEBRUARY 20, 2020. AERIAL DATED JANUARY 1, 2019.
5. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE
PLANE COORDINATE SYSTEM FIPS 3200 (NAD83).
FIGURE 1-2C
SITE LAYOUT MAP - SEEP AND SURFACE WATER
SAMPLE LOCATIONS
2020 COMPREHENSIVE SITE ASSESSMENT UPDATE
ASHEVILLE STEAM ELECTRIC PLANT
ARDEN, NORTH CAROLINA