NCS000575_Fact sheet binder_20230614

DEQ / DEMLR
FACT SHEET FOR NPDES INDUSTRIAL INDIVIDUAL
STORMWATER PERMIT DEVELOPMENT
Basic Information for Permit Issuance and Renewals:
Permit Writer/Date Brianna Young 4/17/2023
Permit Number NCS000575
Owner/Facility Name Duke Energy Progress,LLC/Asheville Steam
Electric Power Plant
SIC AICS Code/Category 4911 /Electric Services
Basin Name/Sub-basin number French Broad/04-03-02
Receiving Stream/HUC UT to French Broad River/060101050704
Stream Classification/Stream Segment B/6-(54.75)
Is the stream impaired on 303 d list]? No
Any TMDLs? No
Any threatened and/or endangered species? See Section 2 below
Any compliance concerns? See Section 2 below
Any permit mods since lastpermit? See Section 1 below
New expiration date XX/XX/2028
Comments on Draft Permit? See Section 6 below
Section 1. Facility Activities and Process:
The Duke Energy Progress Asheville Steam Electric Station is a former coal fired steam electric plant
that was retired in January 2020. Coal combustion residual (CCR) from the original steam electric plant
was collected in an ash basin constructed in conjunction with the original steam electric plant in 1964.
The original coal fired steam electric plant has been replaced by a natural gas burning combined cycle
station. Duke Energy Progress has also built a CCR landfill for removal of CCR from the original 64-ash
basin to facilitate the closure of the 64-ash basin.
Per an email from Duke Energy Progress dated 7/6/2022, construction was completed April 1, 2021 and
ash placement completed in June 2022. Inclusion in the SPPP, and sampling began in in the second
quarter of 2021 concurrent with operation, and closure of the landfill will occur by year end of 2022.
Per an email dated from Duke Energy Progress 2/27/2023, DEQ accepted compliance with CAMA on
10/17/2022. The groundwater Corrective Action Plan was submitted in November 2022 and subsequent
request for a surface water assessment plan that includes sampling down-gradient of SW009, SWO10,
SW012 and SW013. All coal ash subject to stormwater has been excavated and placed in the onsite
landfill, where the final cover system construction was completed in January 2023.
The previous permit(which was issued in 2016) had a public hearing. With the current permit renewal
application, Duke Energy Progress has requested that the following outfalls be removed from the permit:
• SW001: No longer discharges after site modifications
• SW007: Outfall never built
• SW008: Outfall never built
• SW013: Outfall never built
Page 1 of 9

Changes at the facility since the last permit renewal include:
• SW001: Drainage and discharge area modified in 2020 to support coal-fired Unit 1 and Unit 2
decommissioning and coal combustion product project activities. Modifications include removal
of the former coal storage railroad tracks and construction of a grass-covered berm and drainage
features. An asphalt curb was installed along the back haul road to divert the SW001 drainage
area industrial stormwater runoff associated with the road to the SW003 drainage area. No
industrial activity is currently in the drainage area.
• SW007 and SW008 were never constructed and Duke Energy no longer plans to construct the
south haul road.
• Construction on the Combined Cycle Station was completed and the coal-fired Units 1 and 2
were retired in 2020. Stormwater drains adjacent to the station's powerhouse flow into two
stormwater collection basins and discharge though stormwater outfalls SW009 and SWO10 to a
wetland area and then to the French Broad River.
• An industrial landfill for the disposal of CCR from an on-site ash basin was built. Stormwater
that falls on the landfill's access roads and haul road will flow into trenches that drain to two
stormwater collection basins (SWO11 and SW012). Due to facility activity and grading
constraints, SW013 was not built and the stormwater from the CCR landfill haul road is included
in the SW012 drainage area.
• Per an email dated from Duke Energy 2/27/2023: Since ash removal completion in June 2022,
the haul road has been removed, the landfill capped. Landfill and stormwater channels have been
covered with AstroTurf. Maintenance access roads remain and stormwater ponds are in process
of being converted to post construction wet ponds. These areas are also permitted under an
Erosion and Sediment Control permit and a Buncombe County Stormwater Permit.
o SWO11 and SW012: Coal combustion materials no longer transported through these
areas. Landfill completed the final cover system construction in January 2023, only
maintenance access roads to perform inspections remain.
The inspection report from a site visit conducted in October 2020 noted the following items. Duke
Energy Progress provided updates on these items in July 2022:
• The "plugged" status of the stormwater infrastructure on the NE corner of the facility could not
be confirmed during the inspection. To confirm that no stormwater with the potential of being
impacted by operations on site is or can discharge the permittee shall assess and document the
status of all related stormwater infrastructure in the Stormwater Pollution Prevention Plan.
o Duke Energy response: The pipe in question was abandoned and all plant area drains
closed on the operating side of the former coal station. The Demolition group performed
closure on the plant side as former coal pile had been removed. They have a separate
Erosion and Sediment control plan and are separate from operational flows. The pipe was
removed and the areas have no discreet discharge point.
• An area adjacent to the removed section of railroad at the NE corner of the facility was observed
to have the potential to discharge stormwater impacted by the processes on site into Lake Julian.
The permittee shall confirm the status of this area, modify the monitoring procedures on site as
necessary and include those changes in the next permit renewal.
o Duke Energy response: This item is the same area discussed where the former rail bed
was removed. There is no outfall and industrial stormwater is separately collected and
discharged as part of the NPDES wastewater permit.
• Stormwater potentially impacted by the processes on site at the location of the current Stilling
basin and future Leachate collection system is discharging to Powell Creek. The permittee shall
confirm the status of area, modify the monitoring procedures on site as necessary and include
those changes in the next permit renewal.
Page 2 of 9

o Duke Energy response: The stilling pond(NPDES outfall 001) and the leachate tank
(piped directly to MSD-Metropolitan Sewerage District of Buncombe County)have no
stormwater that flows from either area and there are no piped discharges. The
surrounding area is covered by an Erosion and Sediment Control permit.
The inspection report from a site visit conducted in October 2022 states outfalls have been requested to
be removed from the permit: SW001 no longer discharges (drainage area diverted to SW003), SW007
and SW008 will not be constructed, and SW013 (associated with the CCR Landfill)will not be
constructed and the drainage area will be discharged through SW012.
Outfall SW009:
Drainage area consists of the combined cycle station area. Discharge structure is a stormwater detention
basin(East Stormwater Collection Basin) discharging to a wetland area that discharges to the French
Broad River. Limestone riprap and floc socs are utilized in the drainage area ditches. Per Duke Energy
(via email 2/27/2023), the ammonia storage tanks are the only outside containment and the area is being
decommissioned as the station does not inject ammonia for air pollution control. The ammonia is
scheduled to be recycled to an offsite customer.
Outfall SWO10:
Drainage area consists of the combined cycle station area. Discharge structure is a stormwater detention
basin(West Stormwater Collection Basin) discharging to a wetland area that discharges to the French
Broad River. Per Duke Energy (via email 2/27/2023), the ammonia storage tanks are the only outside
containment and the area is being decommissioned as the station does not inject ammonia for air
pollution control. The ammonia is scheduled to be recycled to an offsite customer.
Additional outfalls:
Outfall SW001: No longer receives industrial stormwater runoff due to site modifications.
Outfall SW002: Removed from permit May 2017.
Outfall SW003: Drainage area consists of a road. Coal combustion residuals were formerly hauled
offsite using this road(activity ceased in 2020 as the ash landfill was constructed).
Outfall SW004: Drainage area does not contain industrial activity.
Outfall SW005: Drainage area does not contain industrial activity.
Outfall SW006: Drainage area does not contain industrial activity.
Outfall SW007: Outfall never built.
Outfall SW008: Outfall never built.
Outfall SWO11: Drainage area consists of the CCR landfill area, access roads, and stormwater detention
basin. Coal Combustion residuals ceased being hauled to the ash landfill in June 2022 and the haul road
Page 3 of 9

was restored. The landfill final cover system construction was completed in January 2023. Only
maintenance access roads remain to perform inspections.
Outfall SW012: Drainage area consists of the CCR landfill area, access roads, and stormwater detention
basin. Coal Combustion residuals ceased being hauled to the ash landfill in June 2022 and the haul road
was restored. The landfill final cover system construction was completed in January 2023. Only
maintenance access roads remain to perform inspections.
Outfall SW013: Outfall never built.
Why Industrial Sites with Stormwater are Subject to a Permit: Federal NPDES regulations define
stormwater discharge associated with industrial activity in 40 CFR §122.26 (b)(14) as: "the discharge
from any conveyance that is used for collecting and conveying storm water and that is directly related to
manufacturing,processing or raw materials storage areas at an industrial plant. The term does not
include discharges from facilities or activities excluded from the NPDES program under this part 122.
For the categories of industries identified in this section, the term includes, but is not limited to, storm
water [sic] discharges from industrial plant yards; immediate access roads and rail lines used or traveled
by carriers of raw materials, manufactured products, waste material, or byproducts used or created by
the facility; material handling sites; refuse sites; sites used for the application or disposal of process
waste waters (as defined at part 401 of this chapter); sites used for the storage and maintenance of
material handling equipment; sites used for residual treatment, storage, or disposal; shipping and
receiving areas; manufacturing buildings; storage areas (including tank farms) for raw materials, and
intermediate and final products; and areas where industrial activity has taken place in the past and
significant materials remain and are exposed to storm water. For the purposes of this paragraph, material
handling activities include storage, loading and unloading, transportation, or conveyance of any raw
material, intermediate product, final product, byproduct or waste product. The term excludes areas
located on plant lands separate from the plant's industrial activities, such as office buildings and
accompanying parking lots as long as the drainage from the excluded areas is not mixed with storm
water [sic] drained from the above described areas."
Section 2. Monitoring Information and Compliance History:
• November 2016 to June 2022, benchmarks exceeded for:
o SW003: Mercury 2x, TSS Ix, Copper I
• Per letter dated 10/25/2018, SW003 was in Tier I status for TSS
• Per letter dated 12/6/2018, SW003 was in Tier I status for Copper
• Per an email dated 9/3/2014, SW003 was appropriate for ROS for SW001 and SW002
• There are no NOVs or enforcements in BIMS for this facility; however, a slope failure occurred
at the CCR landfill in February 2022. Per a DEQ email from 2/4/2022, there was no
environmental release, but ash ended up in a lined stormwater ditch. This incident was
investigated by the DEQ Division of Waste Management(DWM).
o Per Shawna Riddle (DEMLR ARO; via email 10/17/2022): The site was in compliance
during an October 2022 inspection and no issues were found from the slope failure in
February. There are no additional concerns that need to be addressed during the permit
renewal process.
o Per Duke Energy (via email 2/27/2023): All sediment and any traces of ash were cleaned
from forebay of SWOT I detention pond from above event. Valves used to detain
stormwater remained closed during storm event to prevent release to environment until
Page 4 of 9

inspection and settling occurred. There have been no benchmark exceedances at either
SWO11 or SW012 during landfill operation and through closure.
Threatened/Endangered species:
In the area of the discharge are the Superb Jewelwing (Calopteryx amata;NC status: SR), Paddlefish
(Polyodon spathula;NC status: E), Blotched Chub (Erimystax insignis; NC status: SR), Eastern
Hellbender(Cryptobranchus alleganiensis alleganiensis; NC status: SC), Creeper(Strophitus undulatus;
NC status: T), and Sickle Darter(Percina williamsi; NC status: SC; Federal status: PT).
In the nearby vicinity of the discharge, there is the Northern Long-eared Bat (Myotis septentrionalis;NC
status: T; Federal status: PE), Mountain Sweet Pitcherplant(Sarracenia jonesii; NC status: E; Federal
status: E), Mole Salamander(Ambystoma talpoideum;NC status: SC), Bog Turtle (Glyptemys
muhlenbergii; NC status: T; Federal status: T(S/A)), Warbling Vireo (Vireo gilvus; NC status: SR), a
mayfly(Macdunnoa brunnea; NC status: SR), and Eastern Small-footed Bat(Myotis leibii;NC status:
SC).
Section 3. Proposed Monitoring for Stormwater Discharges:
The Division considered potential pollutants from past and present industrial activities (coal-fired
electric generation, plant decommissioning, and future ash removal) and data was submitted for
November 2016 to June 2022. Quantitative sampling included pH, TSS, boron, zinc, antimony, arsenic,
beryllium, cadmium, chromium, copper, lead, nickel, selenium, silver, thallium, and mercury.
Unlike most stormwater permits in its program, the Division is proposing a permit structure with outfall-
specific monitoring for discharges. Parameters are based on potential pollutants in the drainage area,
sampling results, and in some cases, dependent upon future activities (e.g., ash removal through the
drainage area). Below is a table of the proposed monitoring for each outfall at the Asheville Steam
Electric Power Plant site.
Outfalls SW009 and SWO10
Combined Cycle Station
Quarterly monitoring
Total Suspended Solids BASIS: Potential pollutant from drainage area and BMP effectiveness
(TSS) indicator.
Quarterly monitoring
PH BASIS: Pollutant indicator
Quarterly monitoring
Total Rainfall BASIS: Discharge potential indicator
Quarterly monitoring
Non-Polar Oil &Grease BASIS: Potential pollutant from lubricants; Method 1664 SGT-HEM
targets petroleum-based O&G
Quarterly monitoring
Monthly Oil Usage BASIS: Potential pollutant from drainage area
Page 5 of 9

Quarterly monitoring
COD BASIS: Pollutant indicator
Quarterly monitoring
Ammonia Nitrogen BASIS: Potential pollutant from drainage area
Stormwater Benchmarks and Tiered Response: Rather than limits,North Carolina NPDES
Stormwater permits contain benchmark concentrations. Stormwater benchmarks are numerical action
levels for stormwater monitoring. Benchmarks are not effluent limits, and benchmark exceedances are
not permit violations. Benchmarks provide facilities a tool for assessing the significance of pollutants in
stormwater discharges and the effectiveness of best management practices (BMPs). Benchmark
concentrations are intended as guidelines for the facility's development and implementation of the
Stormwater Pollution Prevention Plan (SWPPP).
Benchmark exceedances require the permittee to increase monitoring, increase management actions,
increase record keeping, and/or install stormwater BMPs in a tiered program. The permit establishes a
tiered approach to specify actions the permittee must take in response to analytical results above
benchmark concentrations. The tiered structure of the permit provides the permittee and DEMLR wide
flexibility to address issues that may arise with one or more parameters and/or outfalls.
Metals benchmarks are calculated to mimic acute water quality standards and with the guidance of
DWR. NC DWR follows established federal procedures for calculating acute standards when developing
the benchmarks. Just like the acute standards, metals benchmarks normally reflect one half of the
calculated Final Acute Value (the "1/2 FAV"). In most cases, translation into total recoverable values is
based on an assumed hardness of 25 mg/L and a total suspended solids (TSS) concentration of 10 mg/L.
Acute standards protect aquatic life from negative impacts of short-term exposure to higher levels of
chemicals where the discharge enters a waterbody. The Stormwater Permitting Program applies this
approach because of the ephemeral nature of rainfall events.
The Division may evaluate results to determine if a smaller suite of parameters for some outfalls is
adequate to characterize potential pollution or BMP effectiveness. For example, one or more metals or
other parameters may serve as an adequate tracer for the presence of ash pollution during disturbance or
ash removal in specific drainage areas at this site. For parameters that do not have a stormwater
benchmark, the Division may develop a benchmark value if appropriate toxicity data become available
or if rising trends in concentrations suggest a persistent source.
A summary of the benchmarks in the draft permit, and their basis, is below:
Parameter Benchmark Basis
Total Suspended 100 mg/L National Urban Runoff Program (NURP) Study, 1983
Solids TSS
H 6 s.u. 9 s.u. NC Water Quality Standard(Range)
Non-Polar Oil & Review of other state's daily maximum benchmark
Grease, EPA 15 mg/L concentration for this more targeted O&G;NC WQS that
Method 1664 does not allow oil sheen in waters
SGT-HEM
COD 120 mg/L BPJ; Generally found at levels 4x BOD5 in domestic
wastewaters
Page 6 of 9

Ammonia Nitrogen 5 Based on the mussels-present/trout absent acute criteria table
Summer .6 mg/I in the 2013 EPA criteria document
Ammonia Nitrogen 15 mg/L Based on the mussels-present/trout absent acute criteria table
Winter in the 2013 EPA criteria document
Stormwater Pollution Prevention Plan: The proposed permit conditions reflect the EPA and NC's
pollution prevention approach to stormwater permitting. The Division's maintains that implementation
of Best Management Practices (BMPs) and traditional stormwater management practices that control the
source of pollutants meets the definition of Best Available Technology (BAT) and Best Conventional
Pollutant Control Technology(BCT). The permit conditions are not numeric effluent limitations but are
designed to be flexible requirements for implementing site-specific plans to minimize and control
pollutants in stormwater discharges associated with the industrial activity. Title 40 Code of Federal
Regulations (CFR) §122.44(k)(2) authorizes the use of BMPs in lieu of numeric effluent limitations in
NPDES permits when the agency finds numeric effluent limitations to be infeasible. The agency may
also impose BMP requirements which are "reasonably necessary" to carry out the purposes of the Act
under the authority of 40 CFR 122.44(k)(3). The conditions proposed in this draft permit are included
under the authority of both of these regulatory provisions. In essence, the pollution prevention and BMP
requirements operate as limitations on effluent discharges that reflect the application of BAT/BCT.
Flexibility in Tier Responses: Tier Two actions provide an opportunity for the permittee to propose an
alternative monitoring plan for approval by the Region:
• Alternatively, in lieu of steps 2 and 3, the permittee may, after two consecutive exceedances,
exercise the option of contacting the DEMLR Regional Engineer as provided below in Tier
Three. The Regional Engineer may direct the response actions on the part of the permittee as
provided in Tier Three, including reduced or additional sampling parameters or frequency.
• If pursuing the alternative above after two consecutive exceedances, the permittee may propose
an alternative monitoring plan for approval by the Regional Engineer.
The permit therefore allows the permittee to petition the Regional Office for monitoring changes sooner
than Tier Three (upon any four benchmark exceedances) and gives guidance on one option to take. For
example, the permittee may request that mercury only be monitored semi-annually under the tiers, or
that only parameters over the benchmark be monitored more frequently. In this way, changes to the
monitoring scheme for any outfall could be handled outside of a permit modification.
Other Proposed Requirements:
• It is standard for Stormwater Pollution Prevention Plan(SWPPP)requirements to include an
annual certification that stormwater outfalls have been evaluated for the presence of non-
stormwater discharges, and if any are identified, how those discharges are permitted or otherwise
authorized.
• Requirement to submit a request for permit modification if the facility identifies or creates any
new outfalls, removes outfalls, or alters any drainage area that changes potential pollutants. This
site may trigger this requirement during demolition or ash removal activities.
• The Division expects the permittee to apply best professional judgment and consider the safety
of its personnel in fulfilling sampling obligations under the permit.
• Federal regulations require electronic submittal of all discharge monitoring reports (DMRs). If a
state does not establish a system to receive such submittals, then permittees must submit DMRs
electronically to the EPA.
• Quarterly QualitativeNisual Monitoring to assure regular observation of outfalls throughout
year.
Page 7 of 9

Section 4. Changes from previous permit to draft:
• Monitoring increased from semi-annually to quarterly for all parameters and outfalls (qualitative
and quantitative)
• "No discharge" clarifications made
• eDMR requirement added
• Boilerplate language moved into body of the permit; boilerplate no longer attached
• Facility address updated on permit cover sheet
• Non-polar oil and grease added to all outfalls per current permitting guidance
• Monthly Oil Usage added to all outfalls per current permitting guidance
• Monitoring for total hardness added for all outfalls as monitoring for hardness dependent metals
is required
• Benchmarks updated for parameters per guidance from DWR Standards group on stormwater
benchmarks
• Outfall SW001 as it no longer discharges industrial stormwater(per renewal application)
• Outfalls SW007 and SW008 removed from the permit as the road will no longer be built(per
renewal application)
• Outfall SW013 removed from the permit as the outfall will no longer be built(per renewal
application)
• Ammonia nitrogen added to outfalls SW009 and SWO10 due to presence of aqueous ammonia in
drainage area
• COD added to outfalls SW009 and SWO10 due to presence of water treatment chemicals
Section 5. Changes from first draft to second draft:
• Feasibility study removed due to Stormwater Program changes
• Monitoring for Outfalls SW003, SWO11, and SW012 removed from permit based on comments
from Duke Energy Progress and ARO
• Monitoring for boron, Ag, As, Be, Cd, Cr, Cu, Hg,Ni, Pb, Sb, Se, Tl, Zn, and Total Hardness
removed from outfalls SW009 and SWO10 as coal ash hauling has ceased
• Footnote added for ammonia that monitoring could cease after storage tanks decommissioned
and 4 samples below detection
Section 6. Changes from second draft to final:
• None
Section 7. Discussions with the Facility and Regional Office:
• Initial contact with facility: 6/27/2022
• Initial contact with Regional Office: 6/27/2022
• Draft sent to CO peer review: 12/14/2022
• Draft sent to Regional Office: 1/24/2023; 4/17/2023
Page 8 of 9

• Final permit sent for supervisor signature: 5/30/2023
Section 8. Comments received on draft permit:
• Duke Energy Progress (via email 2/27/2023): In June 2022, all remaining ash was successfully
excavated from the 1964 ash basin. NC DEQ DWR and DWM responded in October of 2022
that Duke Energy had complied with closure requirements in accordance with Coal Ash
Management Act of 2014 with a closure report for the 1964 basin and a corrective action plan
(CAP) for the site. The CAP was submitted in November 2022 and a request for a Surface Water
Assessment and monitoring was received from NC DEQ in January 2023. These milestones
point to concurrence with DEQ that all Coal Ash has been removed and/or properly disposed in
the onsite capped and in process of final closure landfill.
o DEMLR response: Monitoring for outfalls SW003, SWO11, and SW012 has been
removed and monitoring for outfalls SW009 and SWO10 have been modified.
• Shawna Riddle (ARO; via email 3/22/2023): ARO can confirm that all coal ash subject to
stormwater has been removed and/or disposed of in the onsite capped landfill.
• Shawna Riddle (ARO; via email 4/21/2023): I reviewed the updated draft and fact sheet. ARO
agrees with the new reduced monitoring.
Page 9 of 9

CITIZE-- T1-- IES
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CITIZE--\
- I_ JES OF THE USA TODAY NETWORK
AFFIDAVIT OF PUBLICATION
BUNCOMBE COUNTY
NORTH CAROLINA
NORTH CAROLINA ENVIRONMENTAL
MANAGEMENT COMMISSION INTENT TO
ISSUE
NPDES STORMVIATER DISCHARGE
PERMITS Before the undersigned,a Notary Public,duly commissioned,qualified and
The North Carolina Environmental Man- authorized by law to administer oaths,personally appeared said legal clerk,
agement Commission proposes to issue who,being first duly sworn,deposes and says:that he/she is the Legal
NPDES stson(s)ter discharge.lw.Public
co- Clerk of The Asheville Citizen-Times,engaged in publication of a
to the person(s)listed below.Pvbhc com-
ment or objection to the draft permits is newspaper known as The Asheville Citizen-Times,published,issued,and
invited. Written comments regarding
the pproposed permit will be accepted un- entered as first class mail in the City of Asheville,in Buncombe County and
til 30 days after the publish date of this State of North Carolina;that he/she is authorized to make this affidavit and
notice and considered in the final deter-
mination regarding permit issuance and swom statement;that the notice or other legal advertisement,a true copy of
perimsiit provisions,The Director of the NC
v on of Ene which is attached here to,was published in The Asheville Citizen-Times on
Dirgy,Mineral,and Land Re-
sources(DEMLR may hold a public hear- the following date(s) 04128123, And that the said newspaper in which
mypublic interest. Please mail comments should there be significant degree
o said notice,paper,document or legal advertisement was published was,at
and/or information requests to DEMLR the time of each and every publication,a newspaper meeting all of the
at 1612 Mail Service Center,Raleigh, NC requirements and qualifications of Section 1-597 of the General Statues of
27699-1512, q q
• Duke Energy Progress, LLC (526 5 North Carolina and was a qualified newspaper within the meaning of
Church Street, Charlotte, NC 28201j has Section 1-597 of the General Statutes of North Carolina.
requested renewal of permit NMOS75
for the Asheville Steam Electric Power
Plant in Buncombe County. This facility,
discharges to Powell Creek and an un-
named tributary to the French Broad
River in the French Broad River Basin. Signed this 28th of April,2023,
Interested persons may visit DEMTLR at
512 N. Salisbury street,. Raleigh, NC
27604 to review information on file.Ad-
ditional information on NPDES permits
and this notice may be found on our
website; https:#deq,nc,gov1dbout/divisio ns/energyy mineral-land Legal Clerk
and resourcesistormwatedstormwater-
programistormwater-public-notices; or
bbbycoon3 contacting 8rr vnna Young at bb�anna. Sworn to and subscribed before the 28th of April,2023
(5681280) 07
Notary Public of State of Wisco sin,Coun Brown
VICKY FELTY �jql
Notary Public My Commission expires.
State of Wisconsin
[phone] I [phone] FAX
14 O.HENRYAVE. I P.O.BOX 2090 1 ASHEVILLE,NC 28802 I(800)800-4204

DEQ / DEMLR
FACT SHEET FOR NPDES INDUSTRIAL INDIVIDUAL
STORMWATER PERMIT DEVELOPMENT
Basic Information for Permit Issuance and Renewals:
Permit Writer/Date Brianna Young 3/9/2023
Permit Number NCS000575
Owner/Facility Name Duke Energy Progress,LLC/Asheville Steam
Electric Power Plant
SIC AICS Code/Category 4911 /Electric Services
Basin Name/Sub-basin number French Broad/04-03-02
Receiving Stream/HUC 003: Powell Creek(Lake Julian)/060101050704
009: UT to French Broad River/060101050704
010: UT to French Broad River/060101050704
011: UT to French Broad River/060101050704
012: UT to French Broad River/060101050704
Stream Classification/Stream Segment 003: C/6-62
009: B/6-(54.75)
010: B/6-(54.75)
011: B/6-(54.75)
012: B/6- 54.75
Is the stream impaired on 303 d list]? No
Any TMDLs? No Statewide Mercury)
Any threatened and/or endangered species? See Section 2 below
Any compliance concerns? See Section 2 below
Any permit mods since lastpermit? See Section 1 below
New expiration date 4/30/2028
Comments on Draft Permit? See Section 6 below
Section 1. Facility Activities and Process:
The Duke Energy Asheville Steam Electric Station is a former coal fired steam electric plant that was
retired in January 2020. Coal combustion residual (CCR) from the original steam electric plant was
collected in an ash basin constructed in conjunction with the original steam electric plant in 1964. The
original coal fired steam electric plant has been replaced by a natural gas burning combined cycle
station. Duke Energy has also built a CCR landfill for removal of CCR from the original 64-ash basin to
facilitate the closure of the 64-ash basin.
Per an email from Duke Energy dated 7/6/2022, construction was completed April 1, 2021 and ash
placement completed in June 2022. Inclusion in the SPPP, and sampling began in in the second quarter
of 2021 concurrent with operation, and closure of the landfill will occur by year end of 2022.
Per an email dated from Duke Energy 2/27/2023, DEQ accepted compliance with CAMA on
10/17/2022. The groundwater Corrective Action Plan was submitted in November 2022 and subsequent
request for a surface water assessment plan that includes sampling down-gradient of SW009, SWO10,
SW012 and SW013. All coal ash subject to stormwater has been excavated and placed in the onsite
landfill, where the final cover system construction was completed in January 2023.
The previous permit(which was issued in 2016) had a public hearing. With the current permit renewal
application, Duke Energy has requested that the following outfalls be removed from the permit:
Page 1 of 11

• SW001: No longer discharges after site modifications
• SW007: Outfall never built
• SW008: Outfall never built
• SW013: Outfall never built
Changes at the facility since the last permit renewal include:
• SW001: Drainage and discharge area modified in 2020 to support coal-fired Unit 1 and Unit 2
decommissioning and coal combustion product project activities. Modifications include removal
of the former coal storage railroad tracks and construction of a grass-covered berm and drainage
features. An asphalt curb was installed along the back haul road to divert the SW001 drainage
area industrial stormwater runoff associated with the road to the SW003 drainage area. No
industrial activity is currently in the drainage area.
• SW007 and SW008 were never constructed and Duke Energy no longer plans to construct the
south haul road.
• Construction on the Combined Cycle Station was completed and the coal-fired Units 1 and 2
were retired in 2020. Stormwater drains adjacent to the station's powerhouse flow into two
stormwater collection basins and discharge though stormwater outfalls SW009 and SWO10 to a
wetland area and then to the French Broad River.
• An industrial landfill for the disposal of CCR from an on-site ash basin was built. Stormwater
that falls on the landfill's access roads and haul road will flow into trenches that drain to two
stormwater collection basins (SWO11 and SW012). Due to facility activity and grading
constraints, SW013 was not built and the stormwater from the CCR landfill haul road is included
in the SW012 drainage area.
• Per an email dated from Duke Energy 2/27/2023: Since ash removal completion in June 2022,
the haul road has been removed, the landfill capped. Landfill and stormwater channels have been
covered with AstroTurf. Maintenance access roads remain and stormwater ponds are in process
of being converted to post construction wet ponds. These areas are also permitted under an
Erosion and Sediment Control permit and a Buncombe County Stormwater Permit.
o SWO11 and SW012: Coal combustion materials no longer transported through these
areas. Landfill completed the final cover system construction in January 2023, only
maintenance access roads to perform inspections remain.
The inspection report from a site visit conducted in October 2020 noted the following items. Duke
Energy provided updates on these items in July 2022:
• The "plugged" status of the stormwater infrastructure on the NE corner of the facility could not
be confirmed during the inspection. To confirm that no stormwater with the potential of being
impacted by operations on site is or can discharge the permittee shall assess and document the
status of all related stormwater infrastructure in the Stormwater Pollution Prevention Plan.
o Duke Energy response: The pipe in question was abandoned and all plant area drains
closed on the operating side of the former coal station. The Demolition group performed
closure on the plant side as former coal pile had been removed. They have a separate
Erosion and Sediment control plan and are separate from operational flows. The pipe was
removed and the areas have no discreet discharge point.
• An area adjacent to the removed section of railroad at the NE corner of the facility was observed
to have the potential to discharge stormwater impacted by the processes on site into Lake Julian.
The permittee shall confirm the status of this area, modify the monitoring procedures on site as
necessary and include those changes in the next permit renewal.
Page 2 of 11

o Duke Energy response: This item is the same area discussed where the former rail bed
was removed. There is no outfall and industrial stormwater is separately collected and
discharged as part of the NPDES wastewater permit.
• Stormwater potentially impacted by the processes on site at the location of the current Stilling
basin and future Leachate collection system is discharging to Powell Creek. The permittee shall
confirm the status of area, modify the monitoring procedures on site as necessary and include
those changes in the next permit renewal.
o Duke Energy response: The stilling pond(NPDES outfall 001) and the leachate tank
(piped directly to MSD-Metropolitan Sewerage District of Buncombe County) have no
stormwater that flows from either area and there are no piped discharges. The
surrounding area is covered by an Erosion and Sediment Control permit.
The inspection report from a site visit conducted in October 2022 states outfalls have been requested to
be removed from the permit: SW001 no longer discharges (drainage area diverted to SW003), SW007
and SW008 will not be constructed, and SW013 (associated with the CCR Landfill)will not be
constructed and the drainage area will be discharged through SW012.
Outfall SW009:
Drainage area consists of the combined cycle station area(fuel oil ,,,,' adin, Teas "heffl ""'
leading/unleading areas, ' ). Discharge structure is a stormwater
detention basin(East Stormwater Collection Basin) discharging through a e ffugate nwta- pipe to a
wetland area that discharges to the French Broad River. Limestone riprap and floc socs are utilized in
the drainage area ditches. Potential pollutants include: Petr-elett .ate,.*,-o"*m en4 building "hv,.,.meek
(Phosphate, Aqtieetis Ammonia, Gitfie and Sulfitfie Aeid, Sodium Hydr-exide, Sodium ,
Fleeeulants and Clarifying " en4s) a"a sediment. See Duke comments
Drainage area and containments around fuel tanks at fuel unloading is a containment that drains to a sump then
an OWS then flows to NPDES outfall 001 in NC0000396. Chemical unloading areas are also in containment that
drain to water treatment sump or turbine building sump, both which discharge to NPDES outfall 001. Chemical
unloading sump drains to NPDES wastewater collection sump and then to NPDES outfall 001. The ammonia
storage tanks on the east side are the only outside containment that is locked and inspected/attended when
stormwater is released. This area is being decommissioned as the station does not inject ammonia for air
pollution control. The ammonia is scheduled to be recycled to an offsite customer for beneficial use before Q2
2023. Transformers also drain into turbine building sumps to NPDES outfall 001.
Outfall SWO10:
Drainage area consists of the combined cycle station area(fuel oil unleading areas, ehefflieal
loading/unloading areas, liquid storage tanks, andsztehyar-ds). Discharge structure is a stormwater
detention basin (West Stormwater Collection Basin) discharging through a pipe to a
wetland area that discharges to the French Broad River. Potential pollutants include: Petr-e euf , wate"
Hydr-exide, Sodium HypoEkler-ite, Flne,.�dClarifying agents), and sediment. See Duke
comments
Drainage area and containments around fuel tanks at fuel unloading is a containment that drains to a sump then
an O WS then flows to NPDES outfall 001 in NC0000396. Chemical unloading areas are also in containment that
drain to water treatment sump or turbine building sump, both which discharge to NPDES outfall 001. Chemical
unloading sump drains to NPDES wastewater collection sump and then to NPDES outfall 001. The ammonia
storage tanks on the east side are the only outside containment that is locked and inspected/attended when
Page 3 of 11

stormwater is released. This area is being decommissioned as the station does not inject ammonia for air
pollution control. The ammonia is scheduled to be recycled to an offsite customer for beneficial use before Q2
2023. Transformers also drain into turbine building sumps to NPDES outfall 001.
Additional outfalls:
Outfall SW001: No longer receives industrial stormwater runoff due to site modifications.
Outfall SW002: Removed from permit May 2017.
Outfall SW003: Drainage area consists of a haul road. Coal ash was formerly hauled offsite using this
road(activity ceased in 2020). Potential pollutants include: Sediment.
Outfall SW004: Drainage area does not contain industrial activity.
Outfall SW005: Drainage area does not contain industrial activity.
Outfall SW006: Drainage area does not contain industrial activity.
Outfall SW007: Outfall never built.
Outfall SW008: Outfall never built.
Outfall SWO11: Drainage area consists of the CCR landfill area, access roads, and stormwater detention
basin. Potential pollutants include: Sediment.
Outfall SW012: Drainage area consists of the CCR landfill area, access roads, and stormwater detention
basin. Potential pollutants include: Sediment.
Outfall SW013: Outfall never built.
Why Industrial Sites with Stormwater are Subject to a Permit: Federal NPDES regulations define
stormwater discharge associated with industrial activity in 40 CFR §122.26 (b)(14) as: "the discharge
from any conveyance that is used for collecting and conveying storm water and that is directly related to
manufacturing,processing or raw materials storage areas at an industrial plant. The term does not
include discharges from facilities or activities excluded from the NPDES program under this part 122.
For the categories of industries identified in this section, the term includes, but is not limited to, storm
water [sic] discharges from industrial plant yards; immediate access roads and rail lines used or traveled
by carriers of raw materials, manufactured products, waste material, or byproducts used or created by
the facility; material handling sites; refuse sites; sites used for the application or disposal of process
waste waters (as defined at part 401 of this chapter); sites used for the storage and maintenance of
material handling equipment; sites used for residual treatment, storage, or disposal; shipping and
receiving areas; manufacturing buildings; storage areas (including tank farms) for raw materials, and
intermediate and final products; and areas where industrial activity has taken place in the past and
significant materials remain and are exposed to storm water. For the purposes of this paragraph, material
handling activities include storage, loading and unloading, transportation, or conveyance of any raw
material, intermediate product, final product, byproduct or waste product. The term excludes areas
located on plant lands separate from the plant's industrial activities, such as office buildings and
Page 4 of 11

accompanying parking lots as long as the drainage from the excluded areas is not mixed with storm
water [sic] drained from the above described areas."
Section 2. Monitoring Information and Compliance History:
• November 2016 to June 2022, benchmarks exceeded for:
o SW003: Mercury 2x, TSS Ix, Copper Ix
• Per letter dated 10/25/2018, SW003 was in Tier I status for TSS
• Per letter dated 12/6/2018, SW003 was in Tier I status for Copper
• Per an email dated 9/3/2014, SW003 was appropriate for ROS for SW001 and SW002
• There are no NOVs or enforcements in BIMS for this facility; however, a slope failure occurred
at the CCR landfill in February 2022. Per a DEQ email from 2/4/2022, there was no
environmental release, but ash ended up in a lined stormwater ditch. This incident was
investigated by the DEQ Division of Waste Management(DWM).
o Per Shawna Riddle (DEMLR ARO; via email 10/17/2022): The site was in compliance
during an October 2022 inspection and no issues were found from the slope failure in
February. There are no additional concerns that need to be addressed during the permit
renewal process.
All sediment and any traces of ash were cleaned from forebay of SW011 detention pond from above
event. Valves used to detain stormwater remained closed during storm event to prevent release to
environment until inspection and settling occurred. There have been no benchmark exceedances at
either SW011 or SW012 during landfill operation and through closure.
Threatened/Endangered species:
In the area of the discharge are the Superb Jewelwing (Calopteryx amata;NC status: SR), Paddlefish
(Polyodon spathula;NC status: E), Blotched Chub (Erimystax insignis; NC status: SR), Eastern
Hellbender(Cryptobranchus alleganiensis alleganiensis; NC status: SC), Creeper(Strophitus undulatus;
NC status: T), and Sickle Darter(Percina williamsi; NC status: SC; Federal status: PT).
In the nearby vicinity of the discharge, there is the Northern Long-eared Bat (Myotis septentrionalis;NC
status: T; Federal status: PE), Mountain Sweet Pitcherplant(Sarracenia jonesii; NC status: E; Federal
status: E), Mole Salamander(Ambystoma talpoideum;NC status: SC), Bog Turtle (Glyptemys
muhlenbergii; NC status: T; Federal status: T(S/A)), Warbling Vireo (Vireo gilvus; NC status: SR), a
mayfly(Macdunnoa brunnea; NC status: SR), and Eastern Small-footed Bat(Myotis leibii;NC status:
SC).
Section 3. Proposed Monitoring for Stormwater Discharges:
The Division considered potential pollutants from past and present industrial activities (coal-fired
electric generation, plant decommissioning, and future ash removal) and data was submitted for
November 2016 to June 2022. Quantitative sampling included pH, TSS,boron, zinc, antimony, arsenic,
beryllium, cadmium, chromium, copper, lead, nickel, selenium, silver, thallium, and mercury.
Unlike most stormwater permits in its program, the Division is proposing a permit structure with outfall-
specific monitoring for discharges. Parameters are based on potential pollutants in the drainage area,
sampling results, and in some cases, dependent upon future activities (e.g., ash removal through the
Page 5 of 11

drainage area). Below is a table of the proposed monitoring for each outfall at the Asheville Steam
Electric Power Plant site.
Outfans SWO11, and SM1012 coo Duke comm
Goal C-embus-fien Ragidual LandfiU and haul read
Quarterly monitoring
Total Suspended Solids BASIS: Potential, ollt tan4 fr.,,ndrainage area and BN4P effeet;yenes-
.
BASIS:CIS. Pall„taPA ;a.1ie to-and impe pr-otiag t...Eieity potential
nuafter-l. monitoring
Non Polar- Oil &Cirease BASIS:C7C• D..to„t;.,l ,.o11„t.,,,t fr.,,n 1„b.r4...,,-.tom. Motl,.,.7 1664 CrT 17>:M
tar-gets pe4eleffm based 0&
Monthly Oil Usage BASIS:CIS• Poten4i l , oli tan4 fFofn drainage area
> Cu,
nuafter-1, r;t
n,,,,,-ter-l. monitoring
Total L7.,.-,1ness
Outfalls SW009 and SWO10 See Duke comments
Combined Cycle Station
Quarterly monitoring
Total Suspended Solids BASIS: Potential pollutant from drainage area and BMP effectiveness
(TSS) indicator.
Quarterly monitoring
H BASIS: Pollutant indicator and important to interpreting toxicity potential
p of metals.
Quarterly monitoring
Total Rainfall BASIS: Discharge potential indicator
Page 6 of 11

Quarterly monitoring
Non-Polar Oil &Grease BASIS: Potential pollutant from lubricants; Method 1664 SGT-HEM
targets petroleum-based O&G
Quarterly monitoring
Monthly Oil Usage BASIS: Potential pollutant from drainage area
Priority Pollutant Metals Quarterly monitoring
Ag, As, Be, Cd, Cr, Cu, BASIS: Coal combustion waste (CCW) constituents.
Hg,Ni, Pb, Sb, Se, Tl,
and Zn
Quarterly monitoring
Boron ** BASIS: Coal combustion waste (CCW) constituent/ coal tracer.
Quarterly monitoring
Total Hardness BASIS: Monitoring for hardness dependent metals required.
Quarterly monitoring
COD BASIS: Pollutant indicator.
Quarterly monitoring
Ammonia Nitrogen BASIS: Pollutant indicator.
**The permittee will be allowed to stop sampling for Priority Pollutant Metals and Boron at outfalls
SW009 and SWO10 after 4 consecutive sampling events with no benchmark exceedances.
Stormwater Benchmarks and Tiered Response: Rather than limits,North Carolina NPDES
Stormwater permits contain benchmark concentrations. Stormwater benchmarks are numerical action
levels for stormwater monitoring. Benchmarks are not effluent limits, and benchmark exceedances are
not permit violations. Benchmarks provide facilities a tool for assessing the significance of pollutants in
stormwater discharges and the effectiveness of best management practices (BMPs). Benchmark
concentrations are intended as guidelines for the facility's development and implementation of the
Stormwater Pollution Prevention Plan (SWPPP).
Benchmark exceedances require the permittee to increase monitoring, increase management actions,
increase record keeping, and/or install stormwater BMPs in a tiered program. The permit establishes a
tiered approach to specify actions the permittee must take in response to analytical results above
benchmark concentrations. The tiered structure of the permit provides the permittee and DEMLR wide
flexibility to address issues that may arise with one or more parameters and/or outfalls.
Metals benchmarks are calculated to mimic acute water quality standards and with the guidance of
DWR. NC DWR follows established federal procedures for calculating acute standards when developing
the benchmarks. Just like the acute standards, metals benchmarks normally reflect one half of the
calculated Final Acute Value (the "1/2 FAV"). In most cases, translation into total recoverable values is
based on an assumed hardness of 25 mg/L and a total suspended solids (TSS) concentration of 10 mg/L.
Acute standards protect aquatic life from negative impacts of short-term exposure to higher levels of
chemicals where the discharge enters a waterbody. The Stormwater Permitting Program applies this
approach because of the ephemeral nature of rainfall events.
Page 7 of 11

The Division may evaluate results to determine if a smaller suite of parameters for some outfalls is
adequate to characterize potential pollution or BMP effectiveness. For example, one or more metals or
other parameters may serve as an adequate tracer for the presence of ash pollution during disturbance or
ash removal in specific drainage areas at this site. For parameters that do not have a stormwater
benchmark, the Division may develop a benchmark value if appropriate toxicity data become available
or if rising trends in concentrations suggest a persistent source.
A summary of the benchmarks in the draft permit, and their basis, is below:
Parameter Benchmark Basis
Antimony Total 340 /L Acute Aquatic Criterion, %2 FAV
Arsenic Total 340 /L Acute Aquatic Criterion, 1/2 FAV
Beryllium Total 65 /L Acute Aquatic Criterion, 1/2 FAV
Boron 34,000 µg/L CCW/Coal constituent;Narrative National Recommended
Water Quality Criterion
Cadmium Total 3 /L Acute Aquatic Criterion, 1/2 FAV
1/2 FAV; Based on (Cr III+Cr VI) acute thresholds and
Chromium(Total) 905 µg/L assumption that industrial activities here are not a source of
hexavalent chromium
Copper Total 10 /L Acute Aquatic Criterion, 1/2 FAV
Lead Total 75 /L Acute A uatic Criterion, 1/2 FAV
Mercury (Total) 12 ng/L CCW/Coal Constituent; Chronic 02B standard
Nickel Total 335 /L Acute Aquatic Criterion, 1/2 FAV
Selenium(Total) 5 µg/L 1/2 FAV,NC-specific, based on 1986 Study on Se impacts in
NC
Silver Total 0.3 /L Acute Aquatic Criterion, 1/2 FAV
Thallium Total 2,000 CCW/Coal constituent; Based on EPA Safe Drinking Water
(Total) µg/L, Act MCL
Zinc Total 126 /L Acute Aquatic Criterion, '/2 FAV
COD 120 mg/L BPJ; Generally found at levels 4x BOD5 in domestic
wastewaters
Ammonia Nitrogen 5 Based on the mussels-present/trout absent acute criteria table
Summer .6 mg/I in the 2013 EPA criteria document
Ammonia Nitrogen 15 mg/L Based on the mussels-present/trout absent acute criteria table
Winter in the 2013 EPA criteria document
Total Suspended 100 mg/L National Urban Runoff Program(NURP) Study, 1983
Solids TSS
H 6 s.u. —9 s.u. NC Water Quality Standard(Range)
Non-Polar Oil & Review of other state's daily maximum benchmark
Grease, EPA 15 mg/L concentration for this more targeted O&G;NC WQS that
Method 1664 does not allow oil sheen in waters
SGT-HEM
Stormwater Pollution Prevention Plan: The proposed permit conditions reflect the EPA and NC's
pollution prevention approach to stormwater permitting. The Division's maintains that implementation
of Best Management Practices (BMPs) and traditional stormwater management practices that control the
source of pollutants meets the definition of Best Available Technology (BAT) and Best Conventional
Pollutant Control Technology(BCT). The permit conditions are not numeric effluent limitations but are
Page 8 of 11

designed to be flexible requirements for implementing site-specific plans to minimize and control
pollutants in stormwater discharges associated with the industrial activity. Title 40 Code of Federal
Regulations (CFR) §122.44(k)(2) authorizes the use of BMPs in lieu of numeric effluent limitations in
NPDES permits when the agency finds numeric effluent limitations to be infeasible. The agency may
also impose BMP requirements which are "reasonably necessary" to carry out the purposes of the Act
under the authority of 40 CFR 122.44(k)(3). The conditions proposed in this draft permit are included
under the authority of both of these regulatory provisions. In essence, the pollution prevention and BMP
requirements operate as limitations on effluent discharges that reflect the application of BAT/BCT.
Mercury Monitoring Requirements: The proposed permit requires mercury to be measured in
stormwater samples by EPA Method 1631 E, which can detect levels as low as 0.5 ng/l. This requirement
is consistent with recent federal rule-making that requires NPDES permittees to monitor discharges with
sufficiently sensitive test procedures approved under 40 CFR §136. Modifications to 40 CFR §122.44(i)
require a method that has a minimum level (ML) at or below the effluent limit(not applicable here), or
the lowest minimum level (ML) of EPA approved analytical methods for the measured parameter. Based
on results, Method 1631E will be required to quantify levels in these discharges. NC DEMLR
understands that this method is more costly and requires a more intensive sampling protocol than most
other parameters, and that fish tissue sampling will be provided during the permit cycle. Therefore, no
benchmark applies that would trigger tiered response actions. Proposed permit provisions also allow the
permittee to use field blank and/or method blank concentrations to adjust reported mercury levels as
long as documented is submitted with the Data Monitoring Report DMR).
Flexibility in Tier Responses: Tier Two actions provide an opportunity for the permittee to propose an
alternative monitoring plan for approval by the Region:
• Alternatively, in lieu of steps 2 and 3, the permittee may, after two consecutive exceedances,
exercise the option of contacting the DEMLR Regional Engineer as provided below in Tier
Three. The Regional Engineer may direct the response actions on the part of the permittee as
provided in Tier Three, including reduced or additional sampling parameters or frequency.
• If pursuing the alternative above after two consecutive exceedances, the permittee may propose
an alternative monitoring plan for approval by the Regional Engineer.
The permit therefore allows the permittee to petition the Regional Office for monitoring changes sooner
than Tier Three (upon any four benchmark exceedances) and gives guidance on one option to take. For
example, the permittee may request that mercury only be monitored semi-annually under the tiers, or
that only parameters over the benchmark be monitored more frequently. In this way, changes to the
monitoring scheme for any outfall could be handled outside of a permit modification.
Other Proposed Requirements:
• It is standard for Stormwater Pollution Prevention Plan(SWPPP)requirements to include an
annual certification that stormwater outfalls have been evaluated for the presence of non-
stormwater discharges, and if any are identified, how those discharges are permitted or otherwise
authorized.
• Requirement to submit a request for permit modification if the facility identifies or creates any
new outfalls, removes outfalls, or alters any drainage area that changes potential pollutants. This
site may trigger this requirement during demolition or ash removal activities.
• The Division expects the permittee to apply best professional judgment and consider the safety
of its personnel in fulfilling sampling obligations under the permit.
Page 9 of 11

• Federal regulations require electronic submittal of all discharge monitoring reports (DMRs). If a
state does not establish a system to receive such submittals, then permittees must submit DMRs
electronically to the EPA.
• Quarterly QualitativeNisual Monitoring to assure regular observation of outfalls throughout
year.
Section 4. Changes from previous permit to draft:
• Monitoring increased from semi-annually to quarterly for all parameters and outfalls (qualitative
and quantitative)
• "No discharge" clarifications made
• eDMR requirement added
• Boilerplate language moved into body of the permit; boilerplate no longer attached
• Facility address updated on permit cover sheet
• Non-polar oil and grease added to all outfalls per current permitting guidance
• Monthly Oil Usage added to all outfalls per current permitting guidance
• Monitoring for total hardness added for all outfalls as monitoring for hardness dependent metals
is required
• Benchmarks updated for parameters per guidance from DWR Standards group on stormwater
benchmarks
• Outfall SW001 as it no longer discharges industrial stormwater(per renewal application)
• Outfalls SW007 and SW008 removed from the permit as the road will no longer be built(per
renewal application)
• Outfall SW013 removed from the permit as the outfall will no longer be built(per renewal
application)
• Ammonia nitrogen added to outfalls SW009 and SW010 due to presence of aqueous ammonia in
drainage area
• COD added to outfalls SW009 and SWO10 due to presence of water treatment chemicals
Section 5. Changes from draft to final:
• Feasibility study removed due to programmatic changes
• Outfalls SW003, SW011, and SW012 removed from permit based on comments from Duke
Energy and ARO
Section 6. Discussions with the Facility and Regional Office:
• Initial contact with facility: 6/27/2022
• Initial contact with Regional Office: 6/27/2022
• Draft sent to CO peer review: 12/14/2022
• Draft sent to Regional Office: 1/24/2023
• Final permit sent for supervisor signature:
Page 10 of 11

Section 7. Comments received on draft permit:
• Keith Douthit(Duke Energy; submitted by Don Safrit via email 2/27/2023): In June 2022, all
remaining ash was successfully excavated from the 1964 ash basin. NC DEQ DWR and DWM
responded in October of 2022 that Duke Energy had complied with closure requirements in
accordance with Coal Ash Management Act of 2014 with a closure report for the 1964 basin and
a corrective action plan(CAP) for the site. The CAP was submitted in November 2022 and a
request for a Surface Water Assessment and monitoring was received from NC DEQ in January
2023. These milestones point to concurrence with DEQ that all Coal Ash has been removed
and/or properly disposed in the onsite capped and in process of final closure landfill.
o DEMLR response:
• Shawna Riddle (ARO; via email 3/22/2023): ARO can confirm that all coal ash subject to
stormwater has been removed and/or disposed of in the onsite capped landfill.
Page 11 of 11

T1_L_\4ESC1 I IZE--N
t�
PART OFTHE USATODAY NETWORK
AFFIDAVIT OF PUBLICATION
BUNCOMBE COUNTY
NORTH CAROLINA
NORTH CAROLINA ENVIRONMENTAL
MANAGEMENT COMMISSION INTENT TO
ISSUE - Before the undersi ned,a Notary Public,duly commissioned,qualified and
NPDES STORMWATER DISCHARGE PER- 9 rY Y
MITS authorized by law to administer oaths,personally appeared said legal clerk,
The North Carolina Environmental Man- who,being first duly swom,deposes and says:that he/she is the Legal
agewnent Commission proposes to issue Clerk of The Asheville Citizen-Times,engaged in publication of a
NPDES stormwater discharge permit(s)to
the person(s) listed below. Public com- newspaper known as The Asheville Citizen-Times,published,issued,and
ment or objection to the draft permits is entered as first class mail in the City of Asheville,in Buncombe County and
invited. Witten comments regarding the
proposed permit will be accept ed urdil 30 State of North Carolina;that he/she is authorized to make this affidavit and
days after the publish date of this notice swom statement,that the notice or other legal advertisement,a true co of
and considered in the final determination g copy
regardirtg permit issuance and permit pra- which is attached here to,was published in The Asheville Citizen-Times on
Energy The Director of the Land
Division of
es the following dates 02101123. And that the said newspaper in which
Energy, Mineral, and Land Resources 9 ( )
(DEM[R)may hold a public hearing should said notice,paper,document or legal advertisement was published was,at
there be a signs iard degree of public in-
terest. the time of each and eve newspaper g
Please mail comments and/or in- every publication,a news a r meeting all of the
formation requests to DEMLR at 1612 Mail requirements and qualifications of Section 1-597 of the General Statues of
Service Center,Raleigh,NC 27699.1612.
North Carolina and was a qualified newspaper within the meaning of
•Duke Energy Pr ress,LLC(526 S Church Section 1-597 of the General Statutes of North Carolina.
Street,Charlotte,t�C 282011 has requested
renewal of permit NCS000575 for the
Asheville Steam Electric Power Plant in
Buncombe County.This facility discharges
to Powell Creek and an unnamed tnbuta-
ryto the French Broad River in the French Signed this 27th of February,Broad River Basin 9 2023
Interested persons may visit DEMLR at 512
N.Salisbury street, Raleigh, NC 27604 to
review information on fie.Additional in-
formation on NPDES permits and this no-
tice may be found on our website:https!/
aeq.ncgovv/about/di isio a ns/e�rg-mineral- Legal Clerk
_ resources/stormwater/stormwater-
programistormwater ui*c-no,ces,-or by contacting Brianna Young at brianna.you Swornto and subscribed before the 27th of February,2023
[e-mail] or 919-70T-3647.
211/23
5574142 vv `-'
Notary Public of State of Wisconsin,County of Brown
T,
My Commission expires.
[phone] 1 [phone] FAX
14 O.HENRY AVE. I P.O.BOX 2090 1 ASHEVILLE,NC 28802 1(800)800.4204
MARIAH VERHAGEN
Notary Public
State of Wisconsin

Compliance Inspection Report
Permit:NCS000575 Effective: 10/30/20 Expiration: 04/30/21 Owner: Duke Energy Progress LLC
SOC: Effective: Expiration: Facility: Asheville Steam Electric Power Plant
County: Buncombe 46 Duke Energy Ln
Region: Asheville
Arden NC 28704
Contact Person:Robert Wylie Title: Phone: [phone]
Directions to Facility:
System Classifications: SWNC,
Primary ORC: Certification: Phone:
Secondary ORC(s):
On-Site Representative(s):
Related Permits:
Inspection Date: 10/05/2022 Entry Time 09:OOAM Exit Time: 12:OOPM
Primary Inspector:Shawna Riddle Phone: [phone]
Secondary Inspector(s):
Reason for Inspection: Routine Inspection Type: Compliance Evaluation
Permit Inspection Type: Stormwater Discharge, Individual
Facility Status: Compliant ❑ Not Compliant
Question Areas:
Storm Water
(See attachment summary)
Page 1 of 3

Permit: NCS000575 Owner-Facility:Duke Energy Progress LLC
Inspection Date: 10/05/2022 Inspection Type:Compliance Evaluation Reason for Visit: Routine
Inspection Summary:
I met with Teresa Williams and Nathan Grant for the inspection(compliance and permit renewal). No issues were observed
during the inspection. The SPPP is current and sampling is being conducted as required.
The site is in compliance and the following outfalls have been requested to be removed from the permit. SW001 no longer
discharges (drainage area diverted to SW003). SW007 and SW008 will not be constructed. SW013 (associated with the
CCR Landfill)will not be constructed and the drainage area will be discharged through SW012.
Page 2 of 3

Permit: NCS000575 Owner-Facility:Duke Energy Progress LLC
Inspection Date: 10/05/2022 Inspection Type:Compliance Evaluation Reason for Visit: Routine
Stormwater Pollution Prevention Plan Yes No NA NE
Does the site have a Stormwater Pollution Prevention Plan? ❑ ❑ ❑
#Does the Plan include a General Location (USGS) map? ❑ ❑ ❑
#Does the Plan include a"Narrative Description of Practices"? ❑ ❑ ❑
#Does the Plan include a detailed site map including outfall locations and drainage areas? ❑ ❑ ❑
#Does the Plan include a list of significant spills occurring during the past 3 years? ❑ ❑ ❑
#Has the facility evaluated feasible alternatives to current practices? ❑ ❑ ❑
#Does the facility provide all necessary secondary containment? ❑ ❑ ❑
#Does the Plan include a BMP summary? ❑ ❑ ❑
#Does the Plan include a Spill Prevention and Response Plan (SPRP)? ❑ ❑ ❑
#Does the Plan include a Preventative Maintenance and Good Housekeeping Plan? ❑ ❑ ❑
#Does the facility provide and document Employee Training? 0 ❑ ❑ ❑
#Does the Plan include a list of Responsible Party(s)? 0 ❑ ❑ ❑
# Is the Plan reviewed and updated annually? 0 ❑ ❑ ❑
#Does the Plan include a Stormwater Facility Inspection Program? 0 ❑ ❑ ❑
Has the Stormwater Pollution Prevention Plan been implemented? 0 ❑ ❑ ❑
Comment:
Qualitative Monitoring Yes No NA NE
Has the facility conducted its Qualitative Monitoring? 0 ❑ ❑ ❑
Comment:
Analytical Monitoring Yes No NA NE
Has the facility conducted its Analytical monitoring? 0 ❑ ❑ ❑
#Has the facility conducted its Analytical monitoring from Vehicle Maintenance areas? ❑ ❑ 0 ❑
Comment:
Permit and Outfalls Yes No NA NE
# Is a copy of the Permit and the Certificate of Coverage available at the site? 0 ❑ ❑ ❑
#Were all outfalls observed during the inspection? ❑ ❑ ❑
# If the facility has representative outfall status, is it properly documented by the Division? ❑ ❑ ❑
#Has the facility evaluated all illicit(non stormwater)discharges? 0 ❑ ❑ ❑
Comment:
Page 3 of 3

Young, Brianna A
From: Riddle, Shawna
Sent: Monday, October 17, 2022 3:53 PM
To: Young, Brianna A
Subject: RE: Asheville Steam Electric Station (NCS000575)
Brianna-
Hey. I did go.The site was in compliance during my inspection, and I found no issues from the slope failure in February.
There are no additional concerns that need to be addressed during the permit renewal process. I will enter the reports
into BIMS ASAP.
Thanks
Shawna
From:Young, Brianna A<[e-mail]>
Sent: Monday, October 17, 2022 2:16 PM
To: Riddle, Shawna <[e-mail]>
Subject: RE:Asheville Steam Electric Station (NCS000575)
Hey Shawna,
Just wanted to follow up and see if you were able to get out to the Duke Energy Asheville site? I didn't see an inspection
report in BIMS.
Thanks!
Brianna
Brianna Young, MS(she/her/hers)
Industrial Individual Permits Coordinator
Stormwater Permitting Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
[e-mail](e-mail preferred)
919-707-3647 (office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
Email correspondence to and from this address is subject to the North Carolina
Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Please check with the appropriate staff before visiting our offices,
as we may be able to handle your requests by phone or email.We appreciate your patience as we continue to serve the public
during this challenging time.
From:Young, Brianna A
Sent: Friday, September 30, 2022 10:31 AM
To: Riddle, Shawna <[e-mail]>
Subject: RE:Asheville Steam Electric Station (NCS000575)

Thanks for the update. Let me know if you need anything prior to then.
Brianna Young, MS(she/her/hers)
Industrial Individual Permits Coordinator
Stormwater Permitting Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
[e-mail](e-mail preferred)
919-707-3647 (office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
Email correspondence to and from this address is subject to the North Carolina
Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Please check with the appropriate staff before visiting our offices,
as we may be able to handle your requests by phone or email.We appreciate your patience as we continue to serve the public
during this challenging time.
From: Riddle, Shawna <[e-mail]>
Sent: Friday, September 30, 2022 10:30 AM
To:Young, Brianna A<[e-mail]>
Subject: RE:Asheville Steam Electric Station (NCS000575)
Hey. I'll be onsite on 10/5. Will send comments after.
Thanks
Shawna
Shawna Riddle
Environmental Program Consultant
Division of Energy, Mineral and Land Resources
North Carolina Department of Environmental Quality
D Qgi 828.296.4500 (Office) 828.299.7043 (Fax)
[e-mail]
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From:Young, Brianna A<Brianna.Young@ncdenrgov>
Sent: Monday, September 12, 2022 8:51 AM
To: Riddle, Shawna <shawna.riddleshawna.riddle@ncdenrgov>
Subject: RE:Asheville Steam Electric Station (NCS000575)
If an inspection is needed, if you could get that done sometime in the next month or so,that would be great!
Brianna Young, MS(she/her)
Industrial Individual Permits Coordinator
Stormwater Permitting Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
2

[e-mail](e-mail preferred)
919-707-3647 (office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
Email correspondence to and from this address is subject to the North Carolina
Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Many employees are working remotely or are on staggered shifts.
Please check with the appropriate staff before visiting our offices,as we may be able to handle your requests by phone or email.We
appreciate your patience as we continue to serve the public during this challenging time.
From: Riddle, Shawna <[e-mail]>
Sent:Thursday,September 8, 2022 4:39 PM
To:Young, Brianna A<[e-mail]>
Subject: RE:Asheville Steam Electric Station (NCS000575)
Brianna-
Hey.Thanks for the email. Let me check on the slope failure, etc. and get back with you. What is your timeframe for a
public notice if I need to conduct an inspection?
Thanks
Shawna
Shawna Riddle
Environmental Program Consultant
Division of Energy, Mineral and Land Resources
North Carolina Department of Environmental Quality
��� 828.296.4500 (Office) 828.299.7043 (Fax)
[e-mail]
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From:Young, Brianna A<[e-mail]>
Sent:Thursday,September 8, 2022 2:41 PM
To: Riddle, Shawna <[e-mail]>
Subject: RE:Asheville Steam Electric Station (NCS000575)
Good afternoon Shawna,
I am working on the Asheville Steam Electric Station (NCS000575) permit renewal. Mack mentioned he forwarded my
message to you, and I wanted to follow up as I had not heard anything to date.
I have previous email correspondence indicating a slope failure on a CCR landfill occurred at this site in February 2022.
Are there any lingering concerns on this that need to be addressed? Or are there any other concerns that should be
addressed during the permit renewal process? Will another site inspection need to be conducted before this permit can
go out to public notice?
Thank you,
3

Brianna Young, MS(she/her/hers)
Industrial Individual Permits Coordinator
Stormwater Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
[e-mail](e-mail preferred)
919-707-3647(office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
Email correspondence to and from this address is subject to the North Carolina
Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Many employees are working remotely or are on staggered shifts.
Please check with the appropriate staff before visiting our offices,as we may be able to handle your requests by phone or email.We
appreciate your patience as we continue to serve the public during this challenging time.
From: Granger,T. Mack<[e-mail]>
Sent:Tuesday,July 26, 2022 4:08 PM
To:Young, Brianna A<[e-mail]>
Subject: RE:Asheville Steam Electric Station (NCS000575)
Hi Brianna,
I am unfamiliar with this project, Shawna Riddle handles Buncombe County projects. I have forwarded your message to
her.
Respectfully,
Mack Granger
Environmental Specialist II
Division of Energy, Mineral and Land Resources
North Carolina Department of Environmental Quality
828 296-4500 main
828 296-4613 office
mack.clranger(-ncdenr.gov
2090 US70 Highway
Swannanoa, NC 28778-8211
D,_ E Q"
al �IIYIrIIIJ�{h.,li,y
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties
4

From:Young, Brianna A<[e-mail]>
Sent:Tuesday,July 26, 2022 10:59 AM
To:Aiken, Stan E<[e-mail]>; Granger,T. Mack<[e-mail]>
Subject: RE:Asheville Steam Electric Station (NCS000575)
Good morning,
I am following up on my previous email regarding the Duke Energy Asheville plant (NCS000575). Are there any
outstanding concerns regarding the slope failure on the CCR landfill? Or should I reach out to DWM folks on this?
Thanks!
Brianna Young, MS(she/her/hers)
Industrial Individual Permits Coordinator
Stormwater Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
[e-mail](e-mail preferred)
919-707-3647 (office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
Email correspondence to and from this address is subject to the North Carolina
Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Many employees are working remotely or are on staggered shifts.
Please check with the appropriate staff before visiting our offices,as we may be able to handle your requests by phone or email.We
appreciate your patience as we continue to serve the public during this challenging time.
From:Young, Brianna A
Sent: Monday,June 27, 2022 1:17 PM
To:Aiken, Stan E<[e-mail]>; Granger,T. Mack<[e-mail]>
Subject:Asheville Steam Electric Station (NCS000575)
Good afternoon,
I am beginning to review the draft permit for the Asheville Steam Electric Station (NCS000575). I have previous email
correspondence indicating a slope failure on a CCR landfill occurred at this site in February 2022. Are there any lingering
concerns on this that need to be addressed? Or are there any other concerns that should be addressed during the
permit renewal process?
Thank you,
Brianna Young, MS(she/her/hers)
Industrial Individual Permits Coordinator
Stormwater Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
[e-mail](e-mail preferred)
919-707-3647 (office)
5

Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
Email correspondence to and from this address is subject to the North Carolina
Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Many employees are working remotely or are on staggered shifts.
Please check with the appropriate staff before visiting our offices,as we may be able to handle your requests by phone or email.We
appreciate your patience as we continue to serve the public during this challenging time.
6

Young, Brianna A
From: Williams, Teresa Lynne <[e-mail]>
Sent: Wednesday,July 6, 2022 5:08 PM
To: Young, Brianna A
Cc: Safrit, Don; Hawkins, Randy
Subject: RE: [EXTERNAL] Asheville Steam Electric Plant (NCS000575) Stormwater Permit Renewal
Application
Attachments: 11-3-20 12520R NCS000575 Compliance Inspection Report.pdf,Tab 1_NPDES-
Individual-Permit-Renewal-Form-20171026-DEMLR-SW_Asheville update 7.6.22 sign.pdf
CAUTION: External email. Do not click links or open attachments unless you verify.Send all suspicious email as an attachment to
Report Spam.
Brianna,
Please see responses below. The referenced inspection report and updated renewal form is attached also.
Let us know if you have any further questions or would like to discuss.
Thank you,
Teresa Will ams
Lead Environmental Field Specialist-CNG
Duke Energy Progress I Asheville Combined Cycle Plant
46 Duke Energy Lane I Arden,NC 128704
828-650-0610-office 1 919-417-6417-cell 1828-650-0701-fax
[e-mail]
From:Young, Brianna A<[e-mail]>
Sent:Tuesday,July 5, 2022 3:15 PM
To: Williams,Teresa Lynne<[e-mail]>
Cc: Hawkins, Randy<[e-mail]>; Safrit, Don <[e-mail]>
Subject: RE: [EXTERNAL]Asheville Steam Electric Plant (NCS000575) Stormwater Permit Renewal Application
Good afternoon Teresa,
After reviewing the information provided, along with information I have in our permit files, I have a few follow-up
questions.
1. The renewal application states there are 6 stormwater outfalls, however, I only count 5 as being requested by
Duke (SW003, SW009, SW010, SW011, SW012). What is the 6t"outfall? There are only 5 outfalls, the renewal
application form has an error stating 6. All other sections reference the five you listed. Attached is a revised
renewal form.
2. The application states Outfalls SW009 and SW010 have "Chemicals" listed as potential pollutants to be
discharged, but do not specify what these chemicals are. Can you provide more information? These are bulk
chemicals for the water treatment building stored both inside and outside (in containment and cover)that have
unloading operations outside in containment. Detailed procedures are used for unloading, so the potential for
accidental spill is unlikely, as well as containment for truck and unloading area connections. The water
1

treatment chemicals include Phosphate,Aqueous Ammonia, Citric and Sulfuric Acid, Sodium Hydroxide, Sodium
Hypochlorite, Flocculants and Clarifying agents. No industrial process water flows into stormwater from
operation. Containments drain into the NPDES industrial waste water system. If more details are needed,
please advise.
3. Has construction on the CCR landfill to facilitate the closure of the 64-ash basin been completed? Construction
was completed April 1, 2021 and ash placement completed last month. Inclusion in the SPPP, and sampling
began in 2nd Quarter 2021 concurrent with operation. Closure of the landfill will occur by year end.
4. Per a DEMLR inspection report from a site visit in October 2020,the below is stated. Can you please provide
confirmation or additional information on each item? All items below were suggestions and discussed during
the site visit and not listed as compliance issues on the report. They were all additionally discussed and
evaluated with our internal permitting support. These items did not result in addition to the station SPPP. The
inspection report listed all areas as compliant without a required response.
a. The "plugged" status of the stormwater infrastructure on the NE corner of the facility could not be
confirmed during the inspection.To confirm that no stormwater with the potential of being impacted by
operations on site is or can discharge the permittee shall assess and document the status of all related
stormwater infrastructure in the Stormwater Pollution Prevention Plan. The pipe in question was
abandoned and all plant area drains closed on the operating side of the former coal station. The
Demolition group performed closure on the plant side as former coal pile had been removed. They have
a separate Erosion and Sediment control plan and are separate from operational flows. The pipe was
removed and the areas have no discreet discharge point.
b. An area adjacent to the removed section of railroad at the NE corner of the facility was observed to have
the potential to discharge stormwater impacted by the processes on site into Lake Julian.The permittee
shall confirm the status of this area, modify the monitoring procedures on site as necessary and include
those changes in the next permit renewal. This item is the same area discussed where the former rail
bed was removed. There is no outfall and industrial stormwater is separately collected and discharged
as part of the NPDES waste water permit.
c. Stormwater potentially impacted by the processes on site at the location of the current Stilling basin and
future Leachate collection system is discharging to Powell Creek.The permittee shall confirm the status
of area, modify the monitoring procedures on site as necessary and include those changes in the next
permit renewal. The stilling pond (NPDES outfall 001) and the leachate tank(piped directly to MSD-
Metropolitan Sewerage District of Buncombe County) have no stormwater that flows from either area
and there are no piped discharges. The surrounding area is covered by an Erosion and Sediment Control
permit.
Please let me know if you have any questions on these items.
Thank you,
Brianna Young, MS(she/her/hers)
Industrial Individual Permits Coordinator
Stormwater Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
2

[e-mail](e-mail preferred)
919-707-3647 (office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
Email correspondence to and from this address is subject to the North Carolina
Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Many employees are working remotely or are on staggered shifts.
Please check with the appropriate staff before visiting our offices,as we may be able to handle your requests by phone or email.We
appreciate your patience as we continue to serve the public during this challenging time.
From:Young, Brianna A
Sent: Friday,July 1, 2022 8:50 AM
To: Safrit, Don <[e-mail]>
Cc:Williams,Teresa Lynne<[e-mail]>; Hawkins, Randy<[e-mail]>
Subject: RE: [EXTERNAL]Asheville Steam Electric Plant (NCS000575) Stormwater Permit Renewal Application
Don,
Thank you for providing this information. If updates to the permit contacts are needed, please be sure to follow the links
in my previous email to submit the forms/information.That will get the information to the right staff to get our database
updated (different staff update different contacts, hence why the links are the best way to go). I will reach out to Teresa
with any questions on the other information once I've had a chance to review everything.
Thank you,
Brianna Young, MS(she/her/hers)
Industrial Individual Permits Coordinator
Stormwater Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
[e-mail](e-mail preferred)
919-707-3647 (office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
Email correspondence to and from this address is subject to the North Carolina
Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Many employees are working remotely or are on staggered shifts.
Please check with the appropriate staff before visiting our offices,as we may be able to handle your requests by phone or email.We
appreciate your patience as we continue to serve the public during this challenging time.
From: Safrit, Don <[e-mail]>
Sent: Friday,July 1, 2022 7:32 AM
To:Young, Brianna A<[e-mail]>
Cc:Williams,Teresa Lynne<[e-mail]>; Hawkins, Randy<[e-mail]>
3

Subject: FW: [EXTERNAL] Asheville Steam Electric Plant (NCS000575) Stormwater Permit Renewal Application
Importance: High
CAUTION: External email. Do not click links or open attachments unless you verify.Send all suspicious email as an attachment to
Report Spam.
Brianna,
Per our brief conversation regarding this matter yesterday at the Harris site, enclosed you will find the information
requested below for the Asheville Plant(NCS000575).As you can see, for continuity purposes,we updated the previous
submittal to update the requested information.
Teresa Williams is the Environmental Field Support contact for the Asheville Plant and her contact information is below:
Teresa Williams
Lead Environmental Field Specialist-CNG
Duke Energy Progress Asheville Combined Cycle Plant
46 Duke Energy Lane Arden, NC 1 28704
828-650-0610-office 919-417-6417-cell 1828-650-0701-fax
[e-mail]
Please let us know if any questions or additional information is needed.
Thanks, Don
Donald(Don)Safrit, P.E.
Lead Environmental Specialist
Duke Energy I Permitting and Compliance,Carolinas
410 S.Wilmington Street I Raleigh,North Carolina 27601
Office:[phone] 1 Cell:[phone]
fDUKE
ENERGY:
From: Young, Brianna A<[e-mail]>
Sent: Monday,June 27, 2022 11:44 AM
To: Bednarcik,Jessica L<Jessica.Bed [e-mail]>
Cc:Safrit, Don <[e-mail]>; [e-mail]; Price,Antonio<Antonio.Price@duke-
enerRy.com>
Subject: [EXTERNAL] Asheville Steam Electric Plant (NCS000575)Stormwater Pemrit Renewal Application
CAUTION! STOP. • expecting
and spelling correct? Does the content make sense? Can you verify the sender? If suspicious report it, then do
not click links, open attachments or enter your ID or password.
Good morning,
The Division of Energy, Mineral, and Land Resources (DEMLR) Stormwater Permitting Program
acknowledges receipt of your renewal application for coverage under NPDES Permit Number NCS000575,
received in our offices on November 4, 2020. Please continue to comply with all conditions and monitoring
requirements in your current NPDES stormwater permit. As long as you have submitted a complete renewal
4

request package and maintain compliance with those permit conditions, stormwater discharges from this facility
are authorized by that permit until the Division issues a renewal permit or notifies you of an alternative action.
I am working on renewing the individual stormwater permit for the Asheville Steam Electric Plant
(NCS000575). I need additional information in order to 1) confirm that the information I have is correct and 2)
make sure the permit adequately serves the needs of the facility. Please provide the following:
• An electronic spreadsheet summarizing all of the monitoring data that has been collected since the
effective date of the current permit;
• Verification that the information in the renewal application is still complete and correct; and
• An explanation of any operational changes since the renewal application was submitted.
Enter your stormwater permit number into the Stormwater Permit Summary Report and you will see a form that
includes the address of the facility,contact information for the permit, and the regulated stormwater outfall(s) for the
facility. Please review the facility information to make sure it is correct. Information can be updated using the links
provided below,where applicable:
• Facility/Company name or ownership: Name/Ownership Change Form
• Owner Affiliation (Legally responsible person; i.e., someone with the company who is designated to
represent the company per signatory requirements or another authorized representative): Permit Contact
Update Request Form
• Delegation of Signature Authority (DOSA): Permit Contact Update Request Form
• Billing contact: Permit Contact Update Request Form
• Permit contact: Permit Contact Update Request Form
• Facility contact: Permit Contact Update Request Form
• Facility address only: Email Bethany og ulias
• Stormwater outfall information: Email Bethany Georgoulias
• Visit the eDMR Six Steps website and complete Steps 1 and 2.
• Pay outstanding permit fees: Stormwater ePayment website
Once I have the above listed information, I can continue my review. You will receive a draft permit for a 30-day
comment period. During this time we will be able to address any comments or concerns you have. During the
same 30-day period, the draft will be sent to a Regional Office staff member for review as well as out to public
notice. Once all comments and concerns are addressed, you may be issued a final permit.
Please contact me if you have any questions.
Thank you,
Brianna Young, MS (she/her/hers)
Industrial Individual Permits Coordinator
Stormwater Program
NC DEQ/ Division of Energy, Mineral, and Land Resources (DEMLR)
[e-mail](e-mail preferred)
919-707-3647(office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
Email correspondence to and from this address is subject to the North Carolina
5

Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Many employees are working remotely or are on staggered shifts.
Please check with the appropriate staff before visiting our offices,as we may be able to handle your requests by phone or email.We
appreciate your patience as we continue to serve the public during this challenging time.
6

Permit Coverage
Renewal Application Form K,r- P National Pollutant Discharge Elimination System NP NC Permit Number
!•i uir�onmerVal
Stormwater Individual Permit S 000575
Qwdflr
Please provide your permit number in box in the upper right hand corner, complete the information in the space provided
below and return the completed renewal form along with the required supplemental information to the address indicated.
Owner Information * Address to which permit correspondence will be mailed
Owner/Organization Name: Duke Energy Progress,LLC
Owner Contact: Jessica Bednarclk
Mailing Address: 526 South Church Street
Charlotte,NC 28202
Phone Number: 704-382-8768
Fax Number:
E-mail address: jessica,[e-mail]
Facility Information
Facility Name: Asheville Steam Electrfc Station dba Asheville Combined Cycle Station
Facility Physical Address: 46 Duke Energy Lane
Arden,NC 28704
Facility Contact: Keith Douthit
Mailing Address: 46 Duke Energy Lane
Arden,INC 28704
Phone Number: Be8-650-0620
Fax Number: 828-650-0701
E-mail address: [e-mail]
Permit Information
Permit Contact: Don Safrlt
Mailing Address: 410 S Wilmington St.
Raleigh,NC 27602
Phone Number: 919-546-6146
Fax Number:
E-mail address: [e-mail]
Discharge Information
Receiving Stream: Lake Julian and French Broad River
Stream Class: C and B
Basin: French Broad
Sub-Basin: upper French Broad(04-03-02)
Number of Outfalls: 5
Facility/Activity Changes Please describe below any changes to your facility or activities since issuance of your permit. Attached a
separate sheet if necessary.
FaciRylActivity Changes are summarized in the attached Industrial Stormwater Permit NCS000575 Renewal Application supplemental information document.
Update 6_3D22-no changes to facility description from 10.2020 application.
Update 7.6.22-Updated number of outfalls on this form to reflect what is contained in renewal application wlupdates.
CERTIFICATION
I certify that I am familiar with the information contained in the application and that to the best of my knowledge and belief
such information is true, complete and accurate.
Signature Date 07.0622
Andrew Sprague,Acting Station Manager for Keith Douthit Station General Manager II
Print or type name of person signing above Title
DEMLR - Stormwater Program
Please return this completed application form
and requested supplemental information to: Dept. of Environmental Quality
q pp 1612 Mail Service Center
Raleigh, North Carolina 27699-1612

oy STA1E'a
v „R
ROY COOPER n
Governor
MICHAEL S.REGAN �
Secretary
BRIAN WRENN NORTH CAROLINA
Director Environmental Quality
November 3, 2020
Duke Energy Progress LLC
Attention: Antonio D. Price, Station Manager
46 Duke Energy Lane
Arden, North Carolina 28704
Subject: Compliance Evaluation Inspection
Asheville Steam Electric Power Plant
Permit: NCS000575
Buncombe County, North Carolina
Dear Mr. Price:
Enclosed please find a copy of the Compliance Evaluation Inspection Report for the
inspection I conducted at the subject facility on October 23, 2020.
The report should be self-explanatory; however, should you have any questions
concerning this report, please do not hesitate to contact me at [phone] or by email
at [e-mail].
Since�ejy,
1�
Isaiah Reed, C Q, MS4C Cl
Environmental Specialist
Land Quality Section
Enclosure: Inspection Report
D �w- North Carolina Department of Environmental Quality I Division of Energy,Mineral and Land Resources
_ Asheville Regional Office 1 2090 U.S.Highway 70 1 Swannanoa,North Carolina 28778
or"r.i uawm�r 828.296.4500

Compliance Inspection Report
Permit:NCS000575 Effective: 06/22/17 Expiration: 04/30/21 Owner. Duke Energy Progress LLC
SOC: Effective: Expiration: Facility: Asheville Steam Electric Power Plant
County: Buncombe 46 Duke Energy Ln
Region: Asheville
Arden NC 28704
Contact Person:Garry Whisnant Title: Station Manager Phone:[phone]
Directions to Facility:
System Classifications:
Primary ORC: Certification: Phone:
Secondary ORC(s):
On-Site Representative(s):
Related Permits:
Inspection Date: 10/23/2020 Entry Time 12:OOPM Exit Time: 03:30PM
Primary Inspector:Isaiah L Reed Phone: [phone]
Secondary Inspector(s):
Reason for Inspection: Routine Inspection Type: Compliance Evaluation
Permit Inspection Type: Stormwater Discharge, Individual
Facility Status: N Compliant ❑ Not Compliant
Question Areas:
Storm Water
(See attachment summary)
Page 1 of 3

Permit: NCS000575 Owner-Facility:Duke Energy Progress LLC
Inspection date: 1 0/2 312 02 0 Inspection Type:Compliance Evaluation Reason for Visit: Routine
Inspection Summary:
On October 23, 2020 this facility was inspected for compliance with the NCS000575 Individual Permit for Stormwater
Discharge.
I met with Teresa Williams and Nathan Grant on site. No major issues were observed during the inspection. However, the
following observation was made:
1)The"plugged"status of the stormwater infrastructure on the NE corner of the facility could not be confirmed during the
inspection.To confirm that no stormwater with the potential of being impacted by operations on site is or can discharge, the
permittee shall asses and document the status of all related stormwater infrastructure in the Stormwater Pollution Prevention
Plan,
2)An area adjacent to the removed section of railroad at the NE corner of the facility was observed to have the potential to
discharge stormwater impacted by the processes on site into Lake Julian. The permittee shall confirm the status of this
area, modify the monitoring procedures on site as necessary and include those changes in the next permit renewal.
3) Stormwater potentially impacted by the processes on site at the location of the current Stilling basin and future Leachate
collection system is discharging to Powell Creek.The permittee shall confirm the status of this area, modify the monitoring
procedures on site as necessary and include those changes in the next permit renewal.
Please give the above items your immediate attention.
If you have any questions, please contact this office at(828)296-4614.
Page 2 of 3

Permit: NCS000575 Owner-Facility:Duke Energy Progress LLC
Inspection Date: 10/23/2020 Inspection Type:Compliance Evaluation Reason for Visit: Routine
Stormwater Pollution Prevention Plan Yes No NA NE
Does the site have a Stormwater Pollution Prevention Plan? 0 ❑ ❑ ❑
#Does the Plan include a General Location (USGS)map? ❑ ❑ ❑
#Does the Plan include a"Narrative Description of Practices"? ❑ ❑ ❑
#Does the Plan include a detailed site map including outfall locations and drainage areas? E ❑ ❑ ❑
#Does the Plan include a list of significant spills occurring during the past 3 years? E ❑ ❑ ❑
#Has the facility evaluated feasible alternatives to current practices? ■ ❑ ❑ ❑
#Does the facility provide all necessary secondary containment? 0 ❑ ❑ ❑
#Does the Plan include a BMP summary? N ❑ ❑ ❑
#Does the Plan include a Spill Prevention and Response Plan(SPRP)? E ❑ ❑ ❑
#Does the Plan include a Preventative Maintenance and Good Housekeeping Plan? 0 ❑ ❑ ❑
#Does the facility provide and document Employee Training? E ❑ ❑ ❑
#Does the Plan include a list of Responsible Party(s)? 0 ❑ ❑ ❑
#Is the Plan reviewed and updated annually? 0 ❑ ❑ ❑
#Does the Plan include a Stormwater Facility Inspection Program? 0 ❑ ❑ ❑
Has the Stormwater Pollution Prevention Plan been implemented? ❑ ❑ ❑
Comment:
Qualitative Monitoring Yes No NA NE
Has the facility conducted its Qualitative Monitoring semi-annually? 0 ❑ ❑ ❑
Comment:
Analytical Monitoring Yes No NA NE
Has the facility conducted its Analytical monitoring? 0 ❑ ❑ ❑
#Has the facility conducted its Analytical monitoring from Vehicle Maintenance areas? ❑ ❑ 0 ❑
Comment:
Permit and Outfalls Yes No NA NE
#is a copy of the Permit and the Certificate of Coverage available at the site? E ❑ ❑ ❑
#Were all outfalls observed during the inspection? N ❑ ❑ ❑
#If the facility has representative outfall status, is it properly documented by the Division? ❑ ❑ 0 ❑
#Has the facility evaluated all illicit(non stormwater)discharges? E ❑ ❑ ❑
Comment:
Page 3 of 3

Young, Brianna A
From: Safrit, Don <[e-mail]>
Sent: Friday, July 1, 2022 7:32 AM
To: Young, Brianna A
Cc: Williams, Teresa Lynne; Hawkins, Randy
Subject: FW: [EXTERNAL] Asheville Steam Electric Plant (NCS000575) Stormwater Permit Renewal
Application
Attachments: 06.30.22 Update to Duke Energy Asheville Industrial Stormwater Permit Renewal
10.2020.pdf, NPDES SW Permit Summary Report 062722 w corrections.pdf; 09-08-21
12520A NPDES Delegate of Signature Authority - Douthit.pdf
Importance: High
CAUTION: External email. Do not click links or open attachments unless you verify.Send all suspicious email as an attachment to
Report Spam.
Brianna,
Per our brief conversation regarding this matter yesterday at the Harris site, enclosed you will find the information
requested below for the Asheville Plant(NCS000575).As you can see, for continuity purposes,we updated the previous
submittal to update the requested information.
Teresa Williams is the Environmental Field Support contact for the Asheville Plant and her contact information is below:
Teresa Williams
Lead Environmental Field Specialist- CNG
Duke Energy Progress Asheville Combined Cycle Plant
46 Duke Energy Lane Arden, NC 1 28704
828-650-0610-office 919-417-6417-cell 1828-650-0701-fax
[e-mail]
Please let us know if any questions or additional information is needed.
Thanks, Don
Donald (Don)Safrit, P.E.
Lead Environmental Specialist
Duke Energy I Permitting and Compliance,Carolinas
410 S.Wilmington Street I Raleigh,North Carolina 27601
Office:[phone] 1 Cell:[phone]
DUDE
ENERGY#
From:Young, Brianna A<[e-mail]>
Sent: Monday,June 27, 2022 11:44 AM
To: Bednarcik,Jessica L<Jessica.Bed [e-mail]>
Cc:Safrit, Don <[e-mail]>; [e-mail]; Price,Antonio<Antonio.Price@duke-
1

energV.com>
Subject: [EXTERNAL] Asheville Steam Electric Plant (NCS000575) Stormwater Pemrit Renewal Application
STOP. ASSESS.VERIFYH Were • expecting
and spelling correct? Does the content make sense? Can you verify the sender? If suspicious report it, then do
not click links, open attachments or enter your ID or password.
Good morning,
The Division of Energy, Mineral, and Land Resources (DEMLR) Stormwater Permitting Program
acknowledges receipt of your renewal application for coverage under NPDES Permit Number NCS000575,
received in our offices on November 4, 2020. Please continue to comply with all conditions and monitoring
requirements in your current NPDES stormwater permit. As long as you have submitted a complete renewal
request package and maintain compliance with those permit conditions, stormwater discharges from this facility
are authorized by that permit until the Division issues a renewal permit or notifies you of an alternative action.
I am working on renewing the individual stormwater permit for the Asheville Steam Electric Plant
(NCS000575). I need additional information in order to 1) confirm that the information I have is correct and 2)
make sure the permit adequately serves the needs of the facility. Please provide the following:
• An electronic spreadsheet summarizing all of the monitoring data that has been collected since the
effective date of the current permit;
• Verification that the information in the renewal application is still complete and correct; and
• An explanation of any operational changes since the renewal application was submitted.
Enter your stormwater permit number into the Stormwater Permit Summary Report and you will see a form that
includes the address of the facility,contact information for the permit, and the regulated stormwater outfall(s)for the
facility. Please review the facility information to make sure it is correct. Information can be updated using the links
provided below,where applicable:
• Facility/Company name or ownership: Name/Ownership Change Form
• Owner Affiliation (Legally responsible person; i.e., someone with the company who is designated to
represent the company per signatory requirements or another authorized representative): Permit Contact
Update Request Form
• Delegation of Signature Authority (DOSA): Permit Contact Update Request Form
• Billing contact: Permit Contact Update Request Form
• Permit contact: Permit Contact Update Request Form
• Facility contact: Permit Contact Update Request Form
• Facility address only: Email Bethanyy og ulias
• Stormwater outfall information: Email Bethany Georgoulias
• Visit the eDMR Six Steps website and complete Steps 1 and 2.
• Pay outstanding permit fees: Stormwater ePayment website
Once I have the above listed information, I can continue my review. You will receive a draft permit for a 30-day
comment period. During this time we will be able to address any comments or concerns you have. During the
same 30-day period, the draft will be sent to a Regional Office staff member for review as well as out to public
notice. Once all comments and concerns are addressed, you may be issued a final permit.
Please contact me if you have any questions.
Thank you,
2

Brianna Young, MS(she/her/hers)
Industrial Individual Permits Coordinator
Stormwater Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
[e-mail](e-mail preferred)
919-707-3647 (office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
Email correspondence to and from this address is subject to the North Carolina
Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Many employees are working remotely or are on staggered shifts.
Please check with the appropriate staff before visiting our offices,as we may be able to handle your requests by phone or email.We
appreciate your patience as we continue to serve the public during this challenging time.
3

Keith Douthit
' DUKE Plant General Manger
Asheville Combined Cycle Station
ENERGY®
Duke Energy Progress
Fed Ex Tracking: 777275445526 ASVL PLT J 46 Duke Energy Lane
Arden, NC 28704
June 30, 2022 o:828-650-0620
f:828-650-0701
[e-mail]
Brianna Young
NCDEMLR Stormwater Program
1612 Mail Service Center
Raleigh, North Carolina 27699-1612
Subject: Asheville Steam Electric Station dba Asheville Combined Cycle Station
Industrial Stormwater Permit No. NCS000575
Permit Renewal Application - Response for updated information
Dear Ms. McCoy:
Duke Energy Progress, LLC requests the subject permit be renewed and reissued. The subject permit
expired on April 30, 2021. Section III Part B of this permit requires the permit application for permit
renewal to be submitted at least 180 days prior to the expiration date of the permit. The renewal
application form and duplicate copies of the supplemental information was submitted October 27, 2020.
An electronic email request for updated information was received on June 27,2022.
The attached renewal package contains updated information requested in the June 27, 2022 request
and as noted below.
In the current permit there are several outfalls that it is requested to be removed from the permit for the
reasons as noted: a. SWO01 does not discharge and b. SW007, SWO08 and SW013 were never built.
Should you have questions or need additional information please contact Don Safrit at 919-546-6146 or
Teresa Williams at 828-650-0610.
Sincerely,
Keith Douthit, General Manager II
Asheville Combined Cycle Station
Enclosures:
Industrial Stormwater Permit NCS000575 Renewal Application
Tab 1 Renewal Application Form-Updated
Tab 2 Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
Tab 3 Site Maps
Tab 4 Summary of Analytical Monitoring-Updated
Tab 5 Summary of Visual Monitoring
Tab 6 Outfall Narrative and Summary of BMPs
Tab 7 Narrative of Facility Changes
Tab 8 Certification of the Development and Implementation of a Stormwater Pollution Prevention Plan for the Permitted Facility-
Updated
Tab 9 Fish Tissue Monitoring Results for the French Broad River 2017-2019
Cc: Brianna Young,MS,NC DEQ, DEMLR, Industrial Individual Permits Coordinator-via email
Don Safrit
Teresa Williams

DUKE
ENERGY®
Asheville Combined Cycle Station
Industrial Stormwater Permit NCS000575
Renewal Application
6.30.22 Update
a �•' •a ,y
94
SZ
■
.R g
October 2020
Updated 6.30.2022

TABLE OF CONTENTS
1 RENEWAL APPLICATION FORM - UPDATED
2 SUPPLEMENTAL INFORMATION REQUIRED FOR
RENEWAL OF INDIVIDUAL NPDES STORMWATER
PERMIT
3 SITE MAPS
3.1 Overall Site Map
3.2 Back Haul Road Area
3.3 Combined Cycle Station Area
3.4 Landfill Area
4 SUMMARY OF ANALYTICAL MONITORING - UPDATED
5 SUMMARY OF VISUAL MONITORING
6 OUTFALL NARRATIVE AND SUMMARY OF BMPS
6.1 Back Haul Road Area
6.2 Combined Cycle Station Area
6.3 Landfill Area
7 NARRATIVE OF FACILITY CHANGES
7.1 Back Haul Road Area
7.2 South Haul Road to New Rockwood Road (Not Constructed)
7.3 Combined Cycle Station
7.4 Landfill Area
8 CERTIFICATION OF THE DEVELOPMENT AND
IMPLEMENTATION OF A STORMWATER POLLUTION
PREVENTION PLAN FOR THE PERMITTED FACILITY -
UPDATED .................................................................
9 FISH TISSUE MONITORING REPORTS IN THE FRENCH
BROAD RIVER 2017 - 2019
ii I Page

1 RENEWAL APPLICATION FORM

Permit Coverage
Renewal Application Form N_r. . National Pollutant Discharge Elimination System NP NC Permit Number
E'rrrirnnm enrol
Stormwater Individual Permit S 000575
Qanlir.
Please provide your permit number in box in the upper right hand corner, complete the information in the space provided
below and return the completed renewal form along with the required supplemental information to the address indicated.
Owner Information * Address to which permit correspondence will be marled
Owner/Organization Name: Duke Energy Progress.LLc
Owner Contact: Jessica Bednarcik
Mailing Address: 526 south Church street
Charlotte,NC 28202
Phone Number: 7D4-382-B76B
Fax Number:
E-mail address: [e-mail]
Facility Information
Facility Name: Asheville Steam Electric Station dba Asheville Combined Cycle Station
Facility Physical Address: 46 Duke Energy Lane
Arden,NC 28704
Facility Contact: Keith Douthit
Mailing Address: 46 Duke Energy Lane
Arden,NC 28704
Phone Number: 828-650-0620
Fax Number: 828-650-0701
E-mail address: [e-mail]
Permit Information
Permit Contact: Dan Safrit
Mailing Address: 410 S Wilmington St.
Raleigh,NC 27602
Phone Number: 919-546-6146
Fax Number:
E-mail address: dcn,[e-mail]
Discharge Information
Receiving Stream: Lake Julian and French Broad River
Stream Class: C and B
Basin: French Broad
Sub-Basin: Upper French Broad(04-03-02)
Number of Outfalls: 6
Facility/Activity Changes_ Please describe below any changes to your facility or activities since issuance of your permit. Attached a
separate sheet if necessary.
Facility/Activity Changes are summarized in the attached Industrial Stormwater Permit NGS000575 Renewal Application supplemental information document,
Update 6 3D22-no changes to facility description from 10.2020 application_
CERTIFICATION
I certify that I am familiar with the information contained in the application and that to the best of my knowledge and belief
such information is true, complete and accurate.
Signature } Date _ W O 1ymo ZozZ_
Keith Douthit Station General Manager II
Print or type name of person signing above Title
Please return this completed application form DEMLR - Stormwater ProgramDept. of Environmental Quality
and requested supplemental information to: 1612 Mail Service Center
Raleigh, North Carolina 27699-1612

2 SUPPLEMENTAL INFORMATION REQUIRED FOR RENEWAL OF
INDIVIDUAL NPDES STORMWATER PERMIT

SUPPLEMENTAL INFORMATION REQUIRED FOR RENEWAL OF INDIVIDUAL
NPDES STORMWATER PERMIT
Two copies of each of the following shall accompany this submittal in order for the
application to be considered complete:
(Do not submit the site Stormwater Pollution Prevention Plan)
Initials
TLW 1. A current Site Map from the Stormwater Pollution Prevention Plan. The
location of industrial activities (including storage of materials, disposal
areas, process areas and loading and unloading areas), drainage
structures, drainage areas for each outfall, building locations and
impervious surfaces should be clearly noted. (Tab 3)
TLW 2. A summary of Analytical Monitoring results during the term of the
existing permit (if your permit required analytical sampling). Do not
submit individual lab reports. The summary can consist of a table
including such items as outfall number, parameters sampled, lab
results, date sampled, and storm event data. (Tab 4)-Updated
TLW 3. A summary of the Visual Monitoring results. Do not submit individual
monitoring reports. The summary can consist of a table including such
items as outfall number, parameters surveyed, observations, and date
monitoring conducted. (Tab 5)
TLW 4. A summary of the Best Management Practices utilized at the
permitted facility.
Summary should consist of a short narrative description of each BMP's
in place at the facility. If the implementation of any BMP's is planned,
please include information on these BMP's. (Tab 6)
TLW 5. A short narrative describing any significant changes in industrial
activities at the permitted facility. Significant changes could include the
addition or deletion of work processes, changes in material handling
practices, changes in material storage practices, and/or changes in the
raw materials used by the facility. (Tab 7)
TLW 6. Certification of the development and implementation of a Stormwater
Pollution Prevention Plan for the permitted facility (Sign and return
attached form). (Tab 8)-Updated
If the final year analytical monitoring of the existing permit term has not been completed
prior to filing the renewal submittal, then the last years monitoring results should be
submitted within 30 days of receipt of the laboratory reports. (i.e. do not withhold renewal
submittal waiting on lab results)

3 SITE MAPS
3.1 OVERALL SITE MAP
3.2 BACK HAUL ROAD AREA
3.3 COMBINED CYCLE STATION AREA
3.4 LANDFILL AREA

it
Structural Legend LEGEND:
Swo12 ­0 add 1 Power Block 1
,.
2 Power Block 2 Site Parcel Boundary ;--- Non-contributing Area
3 Unit 6 Cooling Tower ■----
4 Unit 8 Cooling Tower ® Stormwater Outfall Location ; CT Non-contributing Area
5 Water Treatment Building NPDES Outfall Location Coal Unit 1 and Unit 2 Demolition
0 o ` SW011 6 Administrative Building ---= Non-contributing Area
NPDES ' ''�`♦ 7 Warehouse • Manhole
Outfall 001
� ♦s�� 8 Laydown Yard ;...; Transmisslon and Distribution Switchyard
9 Unit 5 and 6 Transmission Switchyard Hydrology Non-contributing Area
�` `' 10 Unit 7 and 8 Transmission Switchyard Approximate LRB Boundary' ,.... pp Y Non-Contributing Area Flow Path
11 1,250,000 gallon fuel oil storage tank
- Landfill Limits of Construction —
Drai`g� Future SW011 .■.■ g storage e tank CT Non-contributingArea
gallon fuel oil 12 1,804,000
Area. - • � 1 Drainage . r •• ■� 23 •..■• 13 1,804,000 gallon fuel oil storage tank Topographic Contours (10-Foot Interval) Coal Unit 1 and Unit 2 Demolition Area
Landfill 1
Area ;, ?'
=/ ► r ' 14 Former Coal Pile
�'" 1 -- r 15 '64 Ash Basin ® Wetland Area Boundary Transmission and Distribution Switchyard
.rr '4r+.r'y�'►rr .. 'w 26 r 16 Lined Retention Basin 1
J,�. rF ' t ■ `■•■••■ow �\ — �. ` c�.i\ Fl.
� 24 = Drainage Area Boundary
■.;"`�'`f� �� „� �..� �: � r 1►' 17 NPDES Water Treatment System
fi - _ • '1CT�Non-coritributmg
` - ■•�r •. i 18 Outfa l l 001 Stilling Pond
20 : l Area , , NOTES: DB: detention basin
Transmissi d ' rr. ; . = `• ► �l .■ 2019. NPDES: National Pollutant Discharge Elimination S
22 19 Landfill Leachate Collection Tank stem 1. Aerial imagery from Esri Online Services, g y
19 18 4%,Drainage, h., .... : Distribution ; T' "` 20 230 kV Switchyard Area •■■. .� ■; Y 2. Topographic contours from CB&I, 2019. FGD: flue gas desulfurization
Switchyard ;,T 25 ■. 27 21 FGD Scrubber Demolition Area 3. Drainage area boundaries and wetland boundaries from CT: combustion turbine
r l,•i■fir Coal Unit 1' g
' �' ' { ' ' 22 Coal Unit 1 and Unit 2 Demolition Area Geosyntec, 2020. New landfill drawing dated October 5, 2020, CMP: corrugated metal pipe
and Unit 2 f ■
.�" emoliliti n 23 CT Unit 3
A 1';: which incorporates haul road. LRB: lined retention basin
4� - D o Area, - r • JW
- Elio ■..
24 CT Unit 4 4. Hydrology from North Carolina Department of Environmental
Quality.
25 CT Demineralized Water Storage Tanks 5. Site parcel boundary from Buncombe County GIs.
17 ".•'� + 21 ' 26 Laydown Yard 6. Outfall locations are approximate.
ti NPDES 27 CT Warehouse
16 !' 14 : Outfall 002
r 28 Intake
29 Former Once-Through Cooling Water Pond Stormwater Outfall Description and Impervious
. ,,, o 30 Oil/Water Separator Outfalls Coordinates Receiving Water Body Drainage Area Area Drainage Area Runoff Description
Non-Contributing - � _ -
• C-+T Non-contributin SWO03 35' 27' 56.05" N Concrete piping and 8.92 acres 1.42 acres Drainage area includes runoff from the rear plant access road, Duke Energy Progress
Area • ' g
� W. rr■ , ; Area 82' 32' 5.67"W riprap-lined ditch to Lake property,and privately owned property. No bulk chemicals, raw materials or
f • oo , 4'�. r.■rd�►■�' _ Julian. petroleum products are stored within the SWO03 drainage area.
446
rr�. , 13 1 SW009 35° 27' 52.18" N Sto rmw ater detention 61.24 acres 12 acres Drainage area includes runoff from exterior areas of the Combined cycle Statn io
•■■■■■'•'•■Re io■.* `r.•rr . rr r ■■ 12 �„- k 82°32' 35.78"W basin discharging Power Block 1 powerhouse, Unit 5 and 6 transmission switchyard,Combined Cycle
N, through a CMP to a Station entrance road, rear plant access road, parking lot area, Duke Energy Progress
• : T wetland area that property, New Rockwood Road, and privately owned property.
• '*- ; I �, 'L - , discharges to the French The interior areas of the Power Block 1 powerhouse are routed to sumps that drain to
Broad River. an NPDES wastewater permitted outfall.All bulk storage tanks, drums, or other liquid
P ■ 2133 � ._° ►� filled containers within the drainage area are stored within secondary containment.
--' 1 ���_� `� �'t• Drainage from the containments is controlled. Most of the containments discharge
■ , �� ��`e = to an NPDES wastewater permitted outfall.Some of the containments used for fuel
r 10 ,
. .1 i
,+ I 1 ' 9 t r'� 't► oil unloading are visually inspected prior to release to drop inlets to stormwater
'`- NPDES 3 f outfall SW009.The Unit 5 and 6 switchyard is a flat, gravel-covered area, and the
NPDES _ I' I a `♦ switchyard transformers are stored within secondary containment and do not drain
•• Outfall 101 / t Outfall +' ': s� - '�� r _ �V, to stormwater outfall SW009.
• 001 B ,;;•: fir-IV1 f �_ i o SWO10 35°27' 52.33" N Stormwater detention 31.01 acres 25 acres Drainage area includes runoff from exterior areas of the Combined Cycle Station
4 +! 82°32'41.32"W basin discharging Power Block 2 powerhouse, Unit 7 and 8transmission switchyard,Combined Cycle
NPDES SW010x; �; ;L * - a
it;�,,IV ,K _ s� . through a CMP to a Water Treatment Building,and a plant equipment laydown yard.
Outfall Drainage- _ +'•
q �, �, '_ ��s ,;,� � „ wetland area that The interior areas of the Power Block 2 powerhouse and the Water Treatment
001 D 4 Area - , f A discharges to the French Building are routed to sumps that drain to an NPDES wastewater permitted outfall.
o �.4 '�• - �� a Broad River. All bulk storage tanks,drums, or other liquid-filled containers within the drainage
- _ _ i`� - � r � � � ,,�• Ar area are stored within secondary containment. Drainage from the containments is
controlled. Most of the containments discharge to an NPDES wastewater permitted
6 i_ F'�` ,� outfall.Containments used for fuel oil unloading are visually inspected prior to
- �,�ir� �• ' a .t ; release to drop inlets to stormwater outfall SW010.The Unit 6 and Unit 8 turbine
/ SW003 building sump oil water separators are located within the drainage area and
discharge to the level-controlled wastewater collection sump also located within the
'"4rti► 1 ^r I. .' Area SW003 drainage area that discharges to an NPDES wastewater permitted outfall.
', ` `� '�• h, i. •'M ` Two 1,804,000 gallon fuel oil tanks are located within the drainage area.The fuel oil
�.• r 8 ;« `', SW009 g g
o ♦ �'4 �A NPDES r �A!� tanks are stored within secondary containment with unloading area containment
♦ & � , y.�r • �� ll and drainage to an oil/water separator and an NPDES wastewater permitted outfall.
Dramage�l
2,g ♦ t•,`.�� �.�, y� �vR! • Outfall o ♦ , ,r- moo•., .�,� ,,� ■ Area "�'
\ ♦, r`�t '�`r A'' �;�"� 001A DB 1 The Unit 7 and 8 switchyard is a flat, gravel-covered area,and the switchyard
transformers are stored within secondary containment and do not drain to
SWO09 0� NPDES - stormwater outfall SW010.The Power Block 1 and 2 cooling towers are located
pg Outfall ♦ ..T�� within the drainage area; however,the cooling tower basins are contained,with no
+� ♦ ❑ 001 C _ o DB drainage to stormwater outfall SW010.
♦ ® --:-.- �:.. SW011 35' 28' 25.80" N Stormwater detention 2.70 acres 1.61 acres Drainage area includes runoff from the coal ash landfill's eastern gravel-covered
♦ `♦ y+ 82° 32' 50.94"W basin discharging into an access roads. Landfill leachate is collected separately and discharged under a
1010
SW010 ♦o d energy dissipator with separate industrial wastewater pretreatment permit. No bulk chemicals, raw
Ir
1 ultimate discharge to the materials or petroleum products are stored within the SWO11 drainage area.
N N o French Broad River.
21 ��.+ � SW012 35°28'27.30" N Stormwater detention 6.14 acres 3.03 acres Drainage area includes runoff from the coal ash landfill's western gravel-covered �
� 82' 32' 59.66"W basin discharging into an access roads and landfill haul road. Landfill leachate is collected separately and
energy dissipator with discharged under a separate industrial wastewater pretreatment permit. No bulk
i• ultimate discharge to the chemicals, raw materials or petroleum products are stored within the SWO12
French Broad River. drainage area.
1 �
0 1,200
Feet
r
Publish Date: 2020/10/26, 1:55 PM I User: alesueur
Filepath: \\orcas\gis\Jobs\Duke_Energy_1290\Asheville_Plant\Maps\2020_10_SW_PermitRenewal\AQ_DE_Asheville_Fig01_SiteMap.mxd
ANCHOR Figure 1
QEA Overall Site Map
Stormwater Permit Renewal Application
Duke Energy Asheville Steam Electric Plant

Former Stormwater Outfall SWO01
Lake Julian
— _�--_--_-- — Stormwater OutfallSW 3
v---------- ——— _----j_s«=_—_ aster_ __\ \\\\`` =\\\
/ — —————— — ---- _-- �- _ - -- s -----_--- \
/ —99g
Lake Julian
-21
--�c
ete
lz
�36
'_ Z� ss1t------_— -- — J \ ——— -- Detention Basin O ` \\\ " — 7 T \Detention Basin v v v v
/i—� vA V v _ / / I / —�-40ZZ--- � �Z6g� vv �L�"C v-- -- ��� — ��� v � v \ � AAA �---- � I✓
kpie
Ie
Ir
1
ISO
i —
\\\ —A--------
♦��:��� —� Ww Rockwood Road
SBZZ-----------
SOURCE:Drawings provided by Jacobs Engineering dated May 18,2000 LEGEND: DRAINAGE AREA SWO03:
and Chicago Bridge&Iron Company(CB&I)dated April 21,2017. ———————— Topography(2'Interval)
HORIZONTAL DATUM:North Carolina State Plane, North American .------. Drainage Area Boundary Total Drainage Area:8.92 acres
Datum of 1983(NAD83),U.S.Survey Feet Drainage Flow Direction Impervious Drainage Area: 1.42 acres
VERTICAL DATUM:North American Vertical Datum of 1988(NAVD88) 0 100
— — — — Property Line
NOTE:See stormwater Best Management Practices(BMP)described in the Surface Water Feet
Stormwater Permit Renewal Application. MEN BMPs(e.g.Wattles and FIOCTI SOCS)
Publish Date:2020/10/23 4:23 PM I User:dholmer
Filepath:K:\Projects\1290-Duke Energy\Duke-SPPP Update\1290-SPRA-001.dwg Figure 2
ANCHOR Figure 2
QEA Back Haul Road Area Map
Stormwater Permit Renewal Application
Duke Energy Asheville Steam Electric Plant

, LEGEND:
ho To 1 Topography 10'Interval
\ \ \ \ / II •ICI / � \ \\ \ p9 pY( )
\ \1 1 / II //// ♦ \ \ \ Drainage Area Boundary
\ � Drainage Flow Direction
® / — — \\• \\ — — — — Property Line
♦ I Surface Water
r' °-- ¢ — \ \\ — — — Wetland Boundary
Lake Julian oMH-D10 Stormwater Drop Inlet
_\
/ I rl-c
I /// /� \\jam \o »— Stormwater Drain Line
I II -A4 A3 � \ \\ I\�_—'i/ �jr\O\ _►: \�
/ \ / I IM 44 I 1 � \ o c'j\\ \ \ BMPs(e.g.Check Dams and
\� I FIOCTM SOCS)
0 !L 1 i His SWO09 Drainage Area
H- a M M I \ I l l I I I
I 1 / j / l 1 \ \ DRAINAGE AREA SWO09:
H-KAA 1 Iv
® r'� I / \— 1 \\\\ Total Drainage Area:61.24 acres
It370 Impervious Draina a Area: 12 acres
t:;t I 1, :\. p 9
,I MH- a i i F ❑ \ \\\\ \
0 M �e Y4MH I\ 1 / �" o = \\\ \\ DRAINAGE AREASWO10:
SW010 Drainage Area / //�/ / I II H-cz t 1
Total Drainage Area:31.01 acres
N1H_ IMH_D
MH- 4 14
\\\ Impervious Drainage Area:25 acres
I IMH-D : j I V/// /
/
MI -CP0[W P6 M -D18
6H-CII151 \ H-�. MH- 6 ®® /MH-�
MH-B10
MH-B9 MH-D23 / / / / / / / / � — ��� ♦ q}^\
2120 "-°/A
\ \\`— _�• \ \\ / /i oil
/ MH-CP ; �,, ^` .G`H-D2b^�\\ \ `\ \�\\ ` \\ \ —— /O�d i �— ♦ ® \ \ `\
\ = Stormwater Outfall SW010 / ;j\\\ MH-c �, ♦ �� O�EB1 /�`— \ \\ �\y\ \\O\\__-- -- — — I\ \ ♦ \
\ \\ —2110 --�` \�\ //// 21� \ \\�� \\� ----------- , ♦\ \\ °
/Op I� ♦ \\ ' ----_ R /1 i oo ♦ \ \ SOURCE:Drawings provided by VEETech,P.C.,and
\ �
�// /Stormwater Collection Basin�� �� \ / o \ o 1 Catlin Engineers and Scientists dated December 3,
\ \J 1 HW-OF-C ��� / // �O•'_�—__ �_ / \� ^ 1 pl 2019.
I HORIZONTAL DATUM:North Carolina State Plane,
4* Stormwater Outfall SWO09
North American Datum of 1983(NAD83),U.S.Survey
\\ I \\ 0/ �:� \`_ // /' // // y. �'// / /•��-- � _ /_ I 1 I \ \ 1 I 1 Feet
\ \ 1 ^,,2�3 /�' \ \\ `_\ / / / / / // p✓•!\ �� �� _ / ` \ \ / ►� VERTICAL DATUM:North American Vertical Datum
\\ \\ \\ �// \ /; I �� ♦ ��� o °I \ \\ / i of 1988(NAVD88)
\ \ / Stormwater Collection Basin \ ♦ k ♦ 1 \ /
I / � o ��� — �♦ /�� '♦ __� � \ NOTE:See stormwater Best Management Practices
(BMP)described in the Stormwater Permit Renewal
Application.
AP
o
• \\ // / \ \\ % \�I----- Cf o/ % I // / 1\ \ I 0 300
I\ \ Feet
�. I \ \ \\ / � -' �/ \ �� \�----_O---\ #•*'_�_ I of I I\ � �
Publish Date:2020/10/23 4:23 PM I User:dholmer
Filepath:K:\Projects\1290-Duke Energy\Duke-SPPP Update\1290-SPRA-002.dwg Figure 3
ANCHOR Figure 3
QEA"" Combined Cycle Station Area Map
Stormwater Permit Renewal Application
Duke Energy Asheville Steam Electric Plant

`rl'r!j/1l1r1r/\/1!�!((71{y1\/11thdtCl1lt1�j1(TtJlI�rs1 1Llli\\�1j1r 11 '\ R1
Y k
�i/iii— .� / S 1 �}1r71 ( 1 11�I�\'t l\ 4 )V� SlvJl�l?l\ \t `\ ♦\�\`�` �w\�; \ _``� `� \\tom\\\\\ \4o I LEGEND:
---
% �� ^tti` �r�r/✓fj/�)11f1 �5�1� ` ` 11\j\.�1 \!"I'l I II\ Topography(2' Interval)
l'yl)nllb�llt\lli�}Vj\;�\\\��`\�` �\
1
1�' 11'�•...i�r 17/ ff/•/l��rir \ \\�.t\z /111 1��'(711�\\ �1\Ll�\.l\\�\�\�p�� -Ga,—•-` -------�
Drainage Area Boundary
�
/rl�rt\\Ik �, Stormwater Collection
Drainage Flow Direction
-_!a\ �`�\�J✓ =^/� Qf///�i.//<_ ..`vtr r..�i�f/ �G 7\l\�`1i_.-_����-.�a_a ���� \ -��~�a\ •\\ \�1-._ ^\ \\ \ _ _
Property Line
- \\ �="'_/. y1/ � `e.^-- •; \ . 1� 1 ` `."-J/wi 1 T a� �1-,"ter=�'� �a�4'���\ _�- \ \ } _
e�,�� \\���-s`"=_~�/ � _ ''i. r Cl \ \`.'li <.._,.�./f(•. J r r ` eC ��� /e� �r �.� `�a,� \ \ \_- -�vZ \
`; a —_" •��4 '\ram`✓ p y\ -�' \ ' ` �' I-- mac \- a // %//// 1 `\\
Surface Water
` LYE y i/J �y✓�/r f . _���� 1^� i� - `�f�.. /ii r/ /,////////llrlr I \ \\\
Stormwater OutfaII SWO12 Wetlands
__ Y---y���'---" ` �--_- J -' r' •-�� / �s / I I I I \ Lake Julian
Stormwater Outfall SW011 1111\f 11 \ \\
` a�.- 4�..•�y �.- r'} �m S{^.f/glll(��CI I I / Illtlllt
< s �. l 1 F 1 !l I I 1 / � - =�.v�AV ! _
��"
"�— �c\E�'v � },.t �� � I•f/1 I( 1 I I I /i _ \\ \ � aS i1 � \'I
f�a$� \ \ ••� ��, f r'ey^M1 ./j R� i 4 q/r�r/z ! 1 f I�_a I I ,',/s — \\\\ v/l�, j1 4.\ 1 \ 1111 \ � \\
, r//fl! s \ I I I 1 / _ \ \ \\ \ l {III r \ \
v v vas o t/i� x r/r t,rl 1 I I %„ v� v v 7t�< �}V 1 Vv v DRAINAGE AREA SW011:
/ /-v v vvIli Ill u.�f v
.r//ice/ / /�� v�a vv vr. 1) S�ti\Ilh'lill�l �lll ( \ \ \
/� // / // / � � II I� \ \ Total Drainage Area:2.70 acres
Impervious Drainage Area: 1.61 acres
- � \ \ _ � ,\ \4,�t�_ �/ 0-_ �_-�/� / / / ��,��� 1 1 + �• \\\.\ l l DRAINAGE AREA SW012:
Il)11111rrf ap).ti ,
Wit•/~ v� v��AA A-s� \,- .:^•-�,� �������Q70�;����' / `-�„ / / I w I��111t/Sz1�j� StOY1YlWater Collection Basin
SW012 Drainage Area Total Drainage Area:6.14 acres
SW011 Draina a Area Impervious Drainage Area:3.03 acres
g
//
� \\\\1 \ \�\. t\ \\\\ \\\ "�l1 \ 1 ( � ,,,��'���' // I I I I I I ,j II II � �1 1 � 11 �14 ���//•��L\
Landfill Footprint
1 1 \ \ \ I (Non-Contributing Area) I I �q w''/ \ 2
4;1 Proposed SWo13, Not 1 t / v v v as vv v v I I I I /J � v v %r ate' E o - v
Constructed.Haul Road E l 1
\ � Directed to SW012
tit
I I I I
\ \I Perimeter Access Road I I
\ Il+ll rl I \ \\.r •h5dl\1 I I I I I I I I // 1'rr E€E� � / / / - � '. \ �R} \\\ 11
<��;Ir,ti`\zYa.._. � �1�rfu `...---� ..�\�
/////F \� _ ��
_________________=_
\ _ / SOURCE:Drawings provided by Geosyntec
\\ \\\\\\\ �i^� � ��\ ���4T� 1 r I\\ \ \ =-- ------ --================== // + r ' r S i%�J1 d - — Consultants dated 2020.
' II HORIZONTAL DATUM:North Carolina State Plane,
-- y� ��o1 North American Datum of 1983(NAD83),U.S.Survey
f Q Q Q Feet
,�fd�. \ / -__ o o VERTICAL DATUM:North American Vertical Datum
/ �el at -__ _\ \ _ � k Maintenance Roads
Lo1 -'2;t \— � 7\ / o E'-- — � 3 ang� s 0 ❑ o0'Q of 1988(NAVD88)
1t1 r ��`� \1' f r/i/ ! €ii — �E °m A /�-""� i p o f,rl f 1 O o Q
\ \\\rF\\\\51 \/a'1`` '• /4/' =\\� / /r 1 may\ 1 , yu � C- dr, a o I f s ° ❑ ` 0 O \ �t
;I)\• ¢/[/` \\\\ � 12"or 18" Pipe \i s 1 1 t /' '�E E g1( I\ I t r o NOTE:See stormwater Best Management Practices
Illy' I ` o v BMP described in the Stormwater Permit Renewal
Haul Road I /t 4. �n J T ( )
/
! \ { \rJiS, I I \a--4///� r/ r1/ice-/:ice_ ----` — 1 `� ;, t '^. o•-T," a �v�ir ter. > v �r Application.
�f'- E
(y/ Sediment Basin
—
\ > "fit
' I / \\\\\\\tt\f •,.z �-•..v\\�� \it ° \� 1\t\L\\ �',,....�5 —`` Temporary Diversion
I { \\\\\\\\\ tr \\ \ \�% _ %w d 1c \tj� \ 5• SW Drainage Area r���\ s�:- -�,.a ___-----_--- -
\ \\ \\\ \ \ \\ ��' ---- , __ �\ o zoo
\ i \\\\\\\\\\\o \ \ s � �-�/ �/III/��/�\g�� , t /� ) �tv ��,/'�,_,�� z\ �'llj�\ \S,.'^�_���:✓�__^- __" � � �_ t
Feet
J / l� \ \°/-. \. r \� ...�tl-•e���i��'J'I1 \\3 i11\ — —��� /�/ // C Jf1. (v / I r
Publish Date:2020/10/23 4:23 PM I User:dholmer
Filepath:K:\Projects\1290-Duke Energy\Duke-SPPP Update\1290-SPRA-003.dwg Figure 4
ANCHOR Figure 4
O-EA"" Landfill Area Map
Stormwater Permit Renewal Application
Duke Energy Asheville Steam Electric Plant

4 SUMMARY OF ANALYTICAL MONITORING

SWO03 - Analytical Monitoring Results
Sample
Freq. SDOMR Parameter
Quarterly Code: 01097 01002 01012 01022 01027 01034 01042 01051 01067 01147 01077 01059 01092 71900 00530 00400
Benchmark Values(mg/L): 0.09 0.34 0.065 N/A 0.003 0.9 0.010 0.075 0.335 0.056 0.0003 N/A 0.126 N/A 100 6-9
Total Total Total Total Total Total Total Total Total Total Total Total Total Total Total
Monitoring Sample Rainfall Antimony Arsenic Beryllium Boron Cadmium Chromium Copper Lead Nickel Selenium Silver Thallium Zinc Mercury TSS pH
Period Date inches mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L ng/L mg/L S.U.
Y1P1/1/Q1 No Flow
Y1P1/1/Q2 No Flow
Y1P2/2/Q1 03/10/17 1 0.24 <0.005 <0.01 I <0.001 <0.05 <0.001 <0.005 <0.005 <0.005 1 <0.005 <0.01 <0.005 <0.001 0.011 5.78 5.6 6.4
Y1P2/2/Q2 No Flow - - - - - - - - - - - - - - - - -
Y2P1/3/Q1 08/31/17 1.24 <0.005 <0.01 0.000171 <0.05 <0.001 <0.005 0.007 <0.005 0.00281 <0.01 <0.0005 0.0000971 0.030 2.90 31.4 7.1
Y2P1/3/Q2 No Flow - - - - - - - - - - - - - - - - -
Y2P2/4/Q1 01/11/18 2.10 <0.001 <0.001 <0.001 <0.05 <0.001 0.00120 0.00378 <0.001 0.00130 <0.001 <0.0003 <0.0002 0.014 8.80 32 6.5
Y2P2/4/Q2 04/23/18 0.71 <0.001 0.0044 <0.001 <0.05 <0.001 0.0069 0.010 0.0036 0.0049 <0.001 <0.0003 <0.0002 0.068 13.10 87 7.4
Y3P1/5/Q1* 09/26/18 0.64 <0.001 0.00332 <0.001 <0.05 <0.001 0.00846 0.010 0.00390 0.00559 <0.001 <0.0002 <0.0002 0.103 9.77 200 6.4
Y3P1/5/Q2* 10/26/18 1.63 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 0.00431 <0.001 0.00125 <0.001 <0.0002 <0.0002 0.012 8.77 18 6.8
Y3P1/5/Q2* 11/09/18 0.45 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 0.0587 <0.001 <0.001 <0.001 <0.0002 <0.0002 0.012 4.28 7.8 7.2
Y3P1/5/Q2* 12/20/18 1.06 <0.001 0.00392 <0.001 <0.05 <0.001 0.00492 0.00997 0.00307 0.00340 <0.001 <0.0002 <0.0002 0.051 14.2 86 7.2
Y3P2/6/Q1* No Flow - - - - - - - - - - - - - - - - -
Y3P2/6/Q2* 04/05/19 0.31 <0.001 0.00129 <0.001 <0.05 <0.001 0.00116 0.00578 <0.001 <0.001 <0.001 <0.0002 <0.0002 0.014 8.15 21 7.1
Y3P2/6/Q2* 06/07/19 1.11 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 0.00970 <0.001 0.00137 <0.001 <0.0002 <0.0002 0.008 8.20 12 7.2
Y4P1/7/Q1 No Flow - - - - - - - - - - - - - - - - -
Y4P1/7/Q2 10/30/19 1.52 <0.001 0.00125 <0.001 <0.05 <0.001 <0.001 0.00306 <0.001 0.00110 <0.001 <0.0002 <0.0002 0.020 8.08 9 6.8
Y4P2/8/Q1 03/23/20 0.50 <0.001 0.00147 <0.001 <0.05 <0.001 0.00247 0.00434 0.00167 0.00213 <0.001 <0.0002 0.000491 0.033 7.28 24 6.95
Y4P2/8/Q2 04/23/20 1.01 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 0.00754 <0.001 0.00163 <0.001 <0.0002 <0.0002 0.013 9.64 5.8 6.84
Y5P1/9/Q1 09/29/20 0.92 <0.001 <0.001 <0.001 <0.05 <0.001 0.00178 0.005 0.00107 0.0023 <0.001 <0.0002 <0.0002 0.015 8.43 12 6.85
Y5P1/9/Q2 10/28/20 1.29 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 0.00420 <0.001 0.00130 <0.001 <0.0002 <0.0002 0.013 8.01 5.3 7.04
Y5P2/10/Q1 03/25/21 2.99 <0.001 <0.001 <0.001 <0.05 <0.001 0.00235 0.00320 0.00170 0.00212 <0.001 <0.0002 <0.0002 0.018 8.38 36 6.91
Y5P2/10/Q2 No Flow
Y6P1/11/Q1 No Flow
Y6P1/11/Q2 No Flow
Y6P2/12/Q1 02/03/22 i 2.13 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 0.00354 <0.001 0.00123 <0.001 <0.0003 <0.0002 0.009 8.56 22 7.14
Notes:
*Tiered Sampling (Tier One):
• TSS 09/26/18 - 12/20/18
• Copper 11/09/18 - 06/07/19
1. Monitoring Period = Year#Period#/Sample#/Quarter#
2. TBD = to be determined (results not available)
3. TSS = total suspended solids
4. 1 = Laboratory data qualifier indicating estimated concentration above the laboratory method detection limit and below the laboratory reporting limit.

SWO09 - Analytical Monitoring Results - In service 12/01/2020 semi-annual
Sample
Freq. SDOMR Parameter
Quarterly Code: 01097 01002 01012 01022 01027 01034 01042 01051 01067 01147 01077 01059 01092 71900 00530 00400
Benchmark Values(mg/L): 0.09 0.34 0.065 N/A 0.003 0.9 0.010 0.075 0.335 0.056 0.0003 N/A 0.126 N/A 100 6-9
Total Total Total Total Total Total Total Total Total Total Total Total Total Total Total
Monitoring Sample Rainfall Antimony Arsenic Beryllium Boron Cadmium Chromium Copper Lead Nickel Selenium Silver Thallium Zinc Mercury TSS pH
Period Date inches mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L ng/L mg/L S.U.
Y5P1/9 No Flow — — — — — — — — — — — — — — — — —
Y5132/10 3/16/21 0.74 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 0.00268 <0.001 0.01270 <0.001 <0.0002 <0.0002 0.057 3.08 16 6.05
Y6P1/11 No Flow — — — — — — — — — — — — — — — — —
Y6P2/12 02/03/22 2.13 <0.001 <0.001 <0.001 <0.05 <0.001 0.00108 0.00330 <0.001 0.00446 1 <0.001 <0.0003 <0.0002 0.038 3.31 16 7.15

SWO10 - Analytical Monitoring Results - In service 12/01/2020 semi-annual
Sample
Freq. SDOMR Parameter
Quarterly Code: 01097 01002 01012 01022 01027 01034 01042 01051 01067 01147 01077 01059 01092 71900 00530 00400
Benchmark Values(mg/L): 0.09 0.34 0.065 N/A 0.003 0.9 0.010 0.075 0.335 0.056 0.0003 N/A 0.126 N/A 100 6-9
Total Total Total Total Total Total Total Total Total Total Total Total Total Total Total
Monitoring Sample Rainfall Antimony Arsenic Beryllium Boron Cadmium Chromium Copper Lead Nickel Selenium Silver Thallium Zinc Mercury TSS pH
Period Date inches mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L ng/L mg/L S.U.
Y5P1/9 No Flow — — — — — — — — — — — — — — — — —
Y5P2/10 3/16/21 0.74 <0.001 <0.001 <0.001 <0.05 <0.001 0.00113 0.00209 <0.001 0.00103 <0.001 <0.0002 <0.0002 0.067 3.48 13 7.36
Y6131/11 No Flow — — — — — — — — — — — — — — —
Y6P2/12 1 02/03/22 1 2.13 1 <0.001 i <0.001 i <0.001 i <0.05 i <0.001 i 0.00117 1 0.00257 0.00120 0.00115 1 <0.001 1 <0.0003 1 <0.0002 1 0.052 3.12 16 i 7.37

SWO11 - Analytical Monitoring Results- In service 4/1/2021 quarterly
Sample
Freq. SDOMR Parameter
Quarterly Code: 01097 01002 01012 01022 01027 01034 01042 01051 01067 01147 01077 01059 01092 71900 00530 00400
Benchmark Values(mg/L): 0.09 0.34 0.065 N/A 0.003 0.9 0.010 0.075 0.335 0.056 0.0003 N/A 0.126 N/A 100 6-9
Total Total Total Total Total Total Total Total Total Total Total Total Total Total Total
Monitoring Sample Rainfall Antimony Arsenic Beryllium Boron Cadmium Chromium Copper Lead Nickel Selenium Silver Thallium Zinc Mercury TSS pH
Period Date inches mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L ng/L mg/L S.U.
Y5P2/10/Q2 07/26/21 0.04 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 <0.002 <0.001 <0.001 <0.001 <0.0003 <0.0002 <0.005 0.716 3.1 7.75
Y6P1/11/Q1 10/28/21 0.26 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 <0.002 <0.001 <0.001 <0.001 <0.0003 <0.0002 <0.005 0.796 3.2 8.90
Y6P1/11/Q2 02/03/22 2.13 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 <0.002 <0.001 <0.001 <0.001 <0.0003 <0.0002 <0.005 1.06 4.7 7.53
Y6P2/12/Q1 04/04/22 1 0.64 1 <0.001 i 0.00364 1 <0.001 1 <0.05 1 <0.001 1 0.00116 1 0.00237 <0.001 <0.001 1 0.00545 1 <0.0003 1 <0.0002 i <0.005 i 3.00 13 i 7.09

SWO12 - Analytical Monitoring Results - In service 4/1/2021 quarterly
Sample
Freq. SDOMR Parameter
Quarterly Code: 01097 01002 01012 01022 01027 01034 01042 01051 01067 01147 01077 01059 01092 71900 00530 00400
Benchmark Values(mg/L): 0.09 0.34 0.065 N/A 0.003 0.9 0.010 0.075 0.335 0.056 0.0003 N/A 0.126 N/A 100 6-9
Total Total Total Total Total Total Total Total Total Total Total Total Total Total Total
Monitoring Sample Rainfall Antimony Arsenic Beryllium Boron Cadmium Chromium Copper Lead Nickel Selenium Silver Thallium Zinc Mercury TSS pH
Period Date inches mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L ng/L mg/L S.U.
Y5P2/10/Q2 07/26/21 0.04 <0.001 <0.001 <0.001 <0.05 <0.001 0.00176 0.00272 <0.001 <0.001 <0.001 <0.0003 <0.0002 0.011 1.94 28.4 7.59
0.00029
Y6P1/11/Q1 10/28/21 0.26 <0.001 0.00102 <0.001 <0.05 <0.001 <0.001 0.00207 <0.001 <0.001 <0.001 <0.0003 2 0.005 <0.50 3.5 7.80
Y6P1/11/Q2 02/17/22 0.73 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 0.00208 <0.001 <0.001 <0.001 <0.0003 <0.0002 <0.005 1.99 12 8.36
Y6P2/12/Ql i 06/07/22 i 0.15 1 <0.001 1 0.00150 1 <0.001 1 <0.05 1 <0.001 1 0.00125 1 0.00238 <0.001 0.00101 1 <0.001 <0.0003 <0.0002 0.010 i 1.81 5.3 7.07

SWOO2
No Flow for all periods; removed from permit May 3, 2017.
SWOO1
No Flow for all periods; requesting removal.
SWOO7 and SWOO8
Never constructed, requesting removal.
SWO13
Never constructed, requesting removal.

5 SUMMARY OF VISUAL MONITORING

Summary of Visual (Qualitative) Monitoring
Visual (qualitative) results descriptions:
• Clarity = 1 through 5, where 1 is clear and 5 is very cloudy.
• Floating Solids = 1 through 5, where 1 is no solids and 5 is the surface covered with floating solids.
• Suspended Solids = 1 through 5, where 1 is no solids and 5 is extremely muddy.
SWO03 - Visual (Qualitative) Monitoring Results
Floating Suspended Visible Indication of
Date Rainfall Color Odor Clarity Solids Solids Foam Oil Sheen Erosion Comments
11/29/16 0.70 Clear None 1 1 1 No No No None
03/10/17 0.24 Clear None 1 1 1 No No No None
No measurable storm
events during
operational hours for
06/30/17 0.00 N/A N/A N/A N/A N/A N/A N/A N/A this monitoring period
08/31/17 1.24 Clear None 1 1 1 No No No None
10/23/17 3.33 Clear None 1 1 1 No No No None
01/11/18 2.10 Light brown None 2 2 2 No No No None
04/23/18 0.71 Light brown None 2 1 2 No No No None
09/26/18 0.64 Light brown None 3 1 2 No No No None
10/26/18 1.63 Light brown None 2 1 2 No No No None
11/09/18 0.45 Light brown None 2 1 2 No No No None
12/20/18 1.06 Light brown None 3 1 2 No No No None
02/22/19 0.78 Light brown None 2 1 2 No No No None
04/05/19 0.31 Light brown None 2 1 2 No No No None
06/07/19 1.11 Light brown None 2 1 2 No No No None
10/30/19 1.52 Light brown None 2 1 2 No No No None
03/23/20 0.50 Light brown None 2 1 1 No No No None
04/23/20 1.01 Light brown None 2 1 1 No No No None
09/29/20 0.92 Light brown None 2 1 2 No No No None
Notes:
1. N/A indicates not applicable (i.e. no stormwater discharge).

SWO01 - Visual (Qualitative) Monitoring Results
Floating Suspended Visible Indication of
Date Rainfall Color Odor Clarity Solids Solids Foam Oil Sheen Erosion Comments
Light red
11/29/16 0.70 (natural clay) None 2 1 2 No No No No discharge
03/10/17 0.24 N/A None N/A N/A N/A No No No No discharge
No measurable storm
events during
operational hours for
06/30/17 0.00 N/A N/A N/A N/A N/A N/A N/A N/A this monitoring period
Ponding at the
pipe light brown
from
08/31/17 1.24 surrounding soil None 2 1 2 No No No No discharge
Ponding at the
pipe vegetation
overgrown slight Ponding at pipe,
turbidity from discernable discharge
10/23/17 3.33 surrounding soil None 2 1 2 No No No path not evident
Very small amount of
ponding at pipe, but no
01/11/18 2.10 Very light brown None 2 1 2 No No No discharge to lake
Very small amount of
ponding at pipe, but no
04/23/18 0.71 Very light brown None 2 1 2 No No No discharge to lake
Very small amount of
ponding at pipe, but no
09/26/18 0.64 Very light brown None 2 1 2 No No No discharge to lake
Very small amount of
ponding at pipe, but no
10/26/18 1.63 Very light brown None 2 1 2 No No No discharge to lake
No water ponding at
pipe observed and no
11/09/18 0.45 N/A None N/A N/A N/A No No No discharge to lake
Very small amount of
ponding at pipe, but no
12/20/18 1.06 Very light brown None 2 1 2 No No No discharge to lake

Floating Suspended Visible Indication of
Date Rainfall Color Odor Clarity Solids Solids Foam Oil Sheen Erosion Comments
Very small amount of
ponding at pipe, but no
02/22/19 0.78 Very light brown None 2 1 2 No No No discharge to lake
No water ponding at
pipe observed and no
04/05/19 0.31 N/A None N/A N/A N/A No No No discharge to lake
No water ponding at
pipe observed and no
06/07/19 1.11 N/A None N/A N/A N/A No No No discharge to lake
Very small amount of
ponding at pipe, but no
10/30/19 1.52 Very light brown None 2 1 2 No No No discharge to lake
Small amount of
ponding at pipe, but no
03/23/20 0.50 Very light brown None 2 1 1 No No No discharge to lake
04/23/20* 1.01 N/A N/A N/A N/A N/A N/A N/A N/A No discharge
09/29/20* 0.92 N/A N/A N/A N/A N/A N/A N/A N/A No discharge
Notes:
1. N/A indicates not applicable (i.e. no stormwater discharge).
2. SW001 visual (qualitative) monitoring results are associated with ponding observed at the end of a pipe culvert, near the edge of Lake Julian (SW001), and
are not associated with observations of an actual discharge from SW001. There was no actual discharge from SW001 during the stormwater permit
monitoring period.
3. *The stormwater outfall SW001 drainage and discharge area was modified in April 2020 to where no industrial stormwater runoff flowed to or discharged
from SW001. See Tab 7 for a short narrative describing changes to the SW001 drainage area made in 2020.

G 0UTFALL NARRATIVE AND SUMMARY OF BMPS
6.1 BACK HAUL ROAD AREA
OUTFALL ID: SWO03
Discharge Structure: Concrete piping and riprap-lined ditch to Lake Julian
Location: Back Haul Road
Drainage Area: 8.92 acres
Percent Impervious: 15.92%
BMP Summary for SWO03 Drainage Area
INDUSTRIAL ACTIVITIES POTENTIAL BMP SUMMARY
AND DESCRIPTION POLLUTANTS
Material Handling (ash) Fugitive dust settling in Dust suppression with
drainage area water/polymer
Good housekeeping
Residue Hauling Vehicles Tracking of coal Covering trucks
combustion residuals Truck wash
(CCR) products onto Manually spraying tires and
roadway drainage area checking trucks before leaving site
Street sweeping
Leaking of petroleum from Petroleum into Security inspecting trucks for
delivery/haul truck stormwater outfalls leaks reporting any drips ors ills
Erosion caused by truck Sediment into Preventative maintenance on
traffic or weather stormwater shoulders, erosion wattles,
matting, and floc socs.
Landscape and herbicide Sediment into Cut grasses at higher level to
management stormwater encourage healthy growth.
Prohibit use of herbicides in
stormwater areas to prevent
erosion from lack of vegetation.

OUTFALL ID: SW001
Discharge Structure: Not applicable
Location: Back Haul Road
Drainage Area: Not applicable
Percent Impervious: Not applicable
Stormwater discharge outfall SWO01 no longer receives industrial stormwater runoff. See
Tab 7 for a short narrative describing changes to the SWO01 drainage area made in 2020.
BMP Summary for SWO01 Drainage Area
INDUSTRIAL ACTIVITIES POTENTIAL BMP SUMMARY
AND DESCRIPTION POLLUTANTS
Not applicable Not applicable Not applicable

6.2 COMBINED CYCLE STATION AREA
OUTFALL ID: SWO09
Stormwater detention basin discharging through a corrugated
metal pipe (CMP) to a wetland area that discharges to the
Discharge Structure: French Broad River.
Location: Combined Cycle Station area
Drainage Area: 61.24 acres
Percent Impervious: 19.60%
OUTFALL ID: SW010
Stormwater detention basin discharging through a CMP to a
Discharge Structure: wetland area that discharges to the French Broad River.
Location: Combined Cycle Station area
Drainage Area: 31.01 acres
Percent Impervious: 80.62%
Planned BMP Summary for Combined Cycle Station Drainage Areas (Outfalls
SWO09 and SW010)
INDUSTRIAL ACTIVITIES POTENTIAL BMP SUMMARY
AND DESCRIPTION POLLUTANTS
Leaking of petroleum from Petroleum into Security inspecting trucks for
delivery trucks stormwater outfalls leaks reporting any drips ors ills
Fuel oil unloading areas Petroleum into Confine unloading activities to
stormwater outfalls designated areas outside drainage
pathways
Use containment curbs in
unloading areas
Use spill protection (e.g. drip pans
or buckets) beneath unloading
connections
Implement SPCC Plan and FRP
Chemical loading/unloading Chemical into Utilize secondary containment
areas stormwater outfalls structures and sumps for chemical
unloading operations
Use spill protection (e.g. drip pans
or buckets) beneath unloading
connections
Implement chemical unloading
procedures, where necessary

INDUSTRIAL ACTIVITIES POTENTIAL BMP SUMMARY
AND DESCRIPTION POLLUTANTS
Liquid storage tanks Chemical into Cover chemical storage areas,
stormwater outfalls where necessary
Provide secondary containment
around chemical storage areas
Utilize manually activated
containment drain valves, where
necessary
Maintain inventory of in-process
chemical containers
Utilize in-process liquid storage
tank level indicators, where
available
Oil bearing equipment Petroleum into Power Block 1 and 2 transmission
switchyards stormwater outfalls switchyards are constructed with
level grades and gravel surfaces
Secondary containment provided
for transformers
Erosion caused by truck Sediment into Preventative maintenance on
traffic or weather stormwater shoulders, erosion wattles, matting
and floc socs.
Landscape and herbicide Sediment into Cut grasses at higher level to
management stormwater encourage healthy growth.
Prohibit use of herbicides in
stormwater areas to prevent
erosion from lack of vegetation.
Groundwater flow Low pH water Bottom of SWO09 and SWO10
contribution stormwater collection basins lined
with limestone (#57 stone and
riprap)
Limestone riprap and floc socs
utilized in SWO09 drainage area
ditches

6.3 LANDFILL AREA
OUTFALL ID: SW011
Stormwater detention basin discharging into an energy
Discharge Structure: dissipator with ultimate discharge to the French Broad River.
Location: CCR landfill area
Drainage Area: 2.70 acres
Percent Impervious: 59.63%
OUTFALL ID: SWO12
Stormwater detention basin discharging into an energy
Discharge Structure: dissipator with ultimate discharge to the French Broad River.
Location: CCR landfill area
Drainage Area: 6.14 acres
Percent Impervious: 49.35%
OUTFALL ID: SW013*
Discharge Structure: Not applicable
Location: Not applicable
Drainage Area: Not applicable
Percent Impervious: Not applicable
*Stormwater discharge outfall SW013 will not be constructed. Industrial stormwater
drainage from the CCR landfill haul road (permitted as SW013) will be incorporated in the
SW012 drainage area during landfill construction. See Tab 7 for a short narrative describing
the incorporation of the CCR landfill haul road drainage in the SW012 drainage area. This
outfall number is requested to be removed from the permit.

Planned BMP Summary for CCR Landfill Drainage Areas (Outfalls SWO11
and SW012)
INDUSTRIAL ACTIVITIES POTENTIAL BMP SUMMARY
AND DESCRIPTION POLLUTANTS
Material Handling (ash) Fugitive dust settling in Dust suppression with
drainage area water/polymer
Good Housekeeping
Residue Hauling Vehicles Tracking of CCR products Covering Trucks
onto landfill access Truck Wash
roadway drainage areas Manually spraying tires and
checking trucks before leaving '64
ash basin
Street sweeping
Stormwater diversion curbs along
the CCR landfill haul road to direct
industrial stormwater runoff from
the road to SWO12
Leaking of petroleum from Petroleum into Waste handling personnel
haul truck stormwater outfalls inspecting trucks for leaks,
reporting any drips ors ills
Erosion caused by truck Sediment into Preventative maintenance on
traffic or weather stormwater access road shoulders and
diversion berms, check dams,
erosion wattles, matting,
stormwater detention pond
foreba s and baffles
Landscape and Herbicide Sediment into Cut grasses at higher level to
management stormwater encourage healthy growth.
Prohibit use of herbicides in
stormwater areas to prevent
erosion from lack of vegetation

7 NARRATIVE OF FACILITY CHANGES
7.1 BACK HAUL ROAD AREA
In April 2020, the stormwater outfall SWO01 drainage and discharge area was
modified to support coal-fired Unit 1 and Unit 2 decommissioning and Duke Energy
Coal Combustion Product (CCP) project activities. The modifications removed the
coal storage railroad tracks (raw material storage area) from the SWO01 drainage
area and eliminated industrial stormwater drainage from the former coal storage
railroad tracks to SWO01. The modifications included:
• Removal of the former coal storage railroad tracks, immediately adjacent to
SWO01 to the west
• Construction of a grass-covered berm in the location of the former coal
storage railroad tracks, between the back haul road and Lake Julian
• Construction of drainage features including a culvert pipe, drainage swales,
and sediment basins to drain the grass-covered berm area of stormwater not
associated with industrial activities
On September 8, 2020, an asphalt curb was installed along the back haul road to
divert the former SWO01 drainage area industrial stormwater runoff associated with
the road to the SWO03 drainage area. Approximately 0.16 acres of former SWO01
impervious drainage area (back haul road) was diverted to SW003.
There is no industrial activity within or industrial stormwater drainage to the former
SWO01. Duke Energy therefore requests the removal of stormwater outfall SWO01
from Industrial Stormwater Permit No. NCS000575.
7.2 SOUTH HAUL ROAD TO NEW ROCKWOOD ROAD (NOT
CONSTRUCTED)
Stormwater outfalls SW-7 and SW-8 were never constructed but are included in the
current Industrial Stormwater Permit No. NCS000575. Stormwater outfalls SW-7
and SW-8 were permitted in the existing Industrial Stormwater Permit for the
formerly proposed south haul road to New Rockwood Road.
Duke Energy no longer plans to construct the south haul road to New Rockwood
Road or the currently permitted stormwater outfalls SW-7 or SW-8.
Duke Energy therefore requests the removal of stormwater outfalls SW-7 and SW-8
from Industrial Stormwater Permit No. NCS000575.
7.3 COMBINED CYCLE STATION
Construction of the Asheville Combined Cycle Station was completed in 2020, and
the Combined Cycle Station began operations in January 2020. Two new stormwater
outfalls (SW009 and SW010) associated with the Combined Cycle Station were
included in the January 29, 2020 Permit Modification Request letter submitted to the
North Carolina Department of Environmental Quality (DEQ).
The Asheville Steam Electric Plant coal-fired Unit 1 and Unit 2 were retired in
January 2020.

At the Asheville Combined Cycle Station, the stormwater within the powerhouse and
water treatment building process areas (e.g. turbine building drains, transformer
containments, water treatment chemical unloading drains, etc.) gets collected and
sent to a wastewater collection sump which discharges to a National Pollutant
Discharge Elimination System (NPDES) wastewater permitted outfall.
Stormwater collected in the transformer containments is sent to the wastewater
sump through turbine building drain tanks, then to an oil/water separator and
discharges through an NPDES wastewater permitted outfall.
The water treatment chemical unloading containment drains directly to the
wastewater collection sump and has downspouts feeding the containment from
water treatment roof drains.
All bulk storage containers and switchyard transformers located within the SWO09
and SWO10 drainage areas are provided with some means of passive secondary
containment to prevent a release of materials to stormwater outfalls. Drum and
waste container storage areas are located within covered areas of the powerhouse
and water treatment buildings that drain to NPDES permitted wastewater outfalls,
and have containment curbs, or other secondary containment measures. Combined
Cycle Station chemical product unloading activities in the powerhouse and water
treatment building are performed in locations equipped with sumps or secondary
containment measures to prevent release of material to stormwater drains.
All exterior stormwater drains adjacent to the station's powerhouse flow into two
stormwater collection basins and discharge through stormwater outfalls SWO09 and
SWO10 to a wetland area and then to the French Broad River.
Stormwater outfall SWO09 discharge is from the collection basin referred to as the
East Stormwater Collection Basin.
Stormwater outfall SWO10 discharge is from the collection basin referred to as the
West Stormwater Collection Basin.
Stormwater outfall SWO09 and SWO10 descriptions, drainage area information, and
planned BMPs are summarized in Tab 6 of this permit renewal application.
7.4 LANDFILL AREA
Construction of an industrial landfill for the disposal of CCR from an on-site ash
basin began in 2020 and is ongoing. Construction of the landfill is scheduled to be
completed by January 2021, and the landfill and associated stormwater drainage
areas are scheduled to begin operation in mid-January 2021. The landfill is
scheduled to be closed in 2023.
Two new stormwater outfalls (SWO11 and SWO12) associated with the CCR landfill
were included in the January 29, 2020 Permit Modification Request letter submitted
to DEQ.
Based on an August 14, 2020 facility stormwater inspection performed by DEQ,
stormwater outfall SWO13 was added to the draft 2020 Industrial Stormwater Permit

No. NCS000575 modification to incorporate industrial stormwater runoff associated
with the CCR landfill haul road drainage area. Based on facility activity and grading
constraints, the draft-permitted stormwater outfall SWO13 drainage area has been
designed to instead drain industrial stormwater runoff from the CCR landfill haul
road drainage area to stormwater outfall SWO12. Therefore, stormwater outfall
SWO13 will not be constructed as the industrial stormwater from the CCR landfill
haul road drainage area will be included in the SWO12 drainage area and will
discharge through SWO12.
Duke Energy therefore requests the removal of stormwater outfall SWO13 from
Industrial Stormwater Permit No. NCS000575.
The stormwater that falls directly on the landfill will be collected in chimney drains
and processed as leachate which will be discharged under an industrial wastewater
pretreatment permit. Stormwater that falls on the landfill's access roads and the
landfill haul road will flow into trenches that drain into two stormwater collection
basins. These two stormwater collection basin outfalls are identified as stormwater
outfalls SWO11 and SWO12.
Duke Energy has no plans to treat, store, or dispose of significant materials on the
CCR landfill access roads, haul road, or on immediately surrounding areas adjacent
to the landfill in the future. No materials loading or unloading activities will take
place on the access roads, haul road, or on immediately surrounding areas. No
hazardous waste treatment, storage, or disposal will occur in the SWO11 or SWO12
drainage areas. CCR landfill activities will be in compliance with solid waste
management permit 1119-INDUS-2020.
Stormwater outfall SWO11 and SWO12 descriptions, drainage area information, and
planned BMPs are summarized in Tab 6 of this permit renewal application.

8 CERTIFICATION OF THE DEVELOPMENT AND
IMPLEMENTATION OF A STORMWATER POLLUTION
PREVENTION PLAN FOR THE PERMITTED FACILITY

STORMWATER POLLUTION PREVENTION PLAN
DEVELOPMENT AND IMPLEMENTATION
CERTIFICATION
North Carolina Division of Energy, Mineral, and Land Resources— Storm water Program
Facility dame: Asheville Steam Electric Plant dba Asheville Corn bined Cycle Station
Permit Number: NGS000575
Location Address: 46 Duke Energy Lane
Arden,NO 28704
County:
Buncombe
"I certify, under penalty of law, that the Stormwater Pollution Prevention Plan (SPPP) document and all
attachments were developed and implemented under my direction or supervision in accordance with a system
designed to assure that qualified personnel properly gather and evaluate the information required by the SPPP.
Based on my inquiry of the person or persons who manage the system, or those persons directly responsible
for gathering the information, the information gathered is, to the best of my knowledge and belief, true,
accurate and complete."
And
I certify that the SPPP has been developed, signed and retained at the named facility location, and the SPPP
has been fully implemented at this facility location in accordance with the terms and conditions of the
stormwater discharge permit."
And
"I am aware that there are significant penalties for falsifying information, including the possibility of fines and
imprisonment for knowing violations."
Sign (according to permit signatory requirements) and return this Certification. DO NOT
SEND STORMWATER POLLUTION PREVENTION PLAN WITH THIS CERTIFICATION.
Signature Date zozz-
Keith Douthit Plant General Manager II
Print or type name of person signing above Title
SPPP Certification 10/13

9 FISH TISSUE MONITORING REPORTS IN THE FRENCH
BROAD RIVER 2017 - 2019

Asheville Steam Station
NPDES Permit No. NC0000396
Arsenic, Mercury, and Selenium Monitoring of Fish in the French Broad River
Buncombe County, North Carolina
Duke Energy Progress
June, 2020

Table of Contents
Page
1.0 Introduction....................................................................................................................... 1
2.0 Study Site Description and Sampling Locations .............................................................. 1
3.0 Target Species................................................................................................................... 1
4.0 Field Sampling Methods................................................................................................... 1
5.0 Laboratory Processing and Arsenic, Mercury, and Selenium Analysis............................ 2
6.0 Data Analysis and Reporting............................................................................................ 2
7.0 References......................................................................................................................... 3
List of Tables
Page
Table
1 Arsenic, mercury, and selenium concentrations in axial muscle of fish from the
French Broad River during June, October, and November 2019. .................................... 5
2 Baseline mercury and selenium concentrations in axial muscle of fish from the
French Broad River, August and November 2004............................................................ 6
List of Figures
Page
F
1 French Broad River arsenic, mercury, and selenium monitoring locations...................... 4
i

1.0 Introduction
Duke Energy Progress (DEP) owns and operates the Asheville Steam Station (Asheville Station)
located on the east side of the French Broad River in Buncombe County, Arden, North Carolina. As
required by the Asheville Station's National Pollutant Discharge Elimination System (NPDES)Permit
No. NC0000396 (current through December 31, 2019), Special Condition A. (13), monitoring of
arsenic, mercury, and selenium in fish from the French Broad River was conducted. Fish tissue
monitoring (mercury and selenium only) was originally required historically after Flue Gas
Desulfurization(FGD) operations commenced in December of 2005. This data report is submitted to
fulfill the annual monitoring as required by the NPDES permit.
2.0 Study Site Description and Sampling Locations
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).
3.0 Target Species
The target fish were black bass (preferred Smallmouth Bass) and sunfish (preferred Redbreast
Sunfish). Where the full complement of preferred target species was not available, Largemouth
and Bluegill were also included as necessary (Table 1). An attempt was made to collect 10 fish
per target species during three separate sampling events. 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).
4.0 Field Sampling Methods
Fish were collected using electrofishing procedures specified in the DEP Biology Program
Procedures Manual (Procedure NR-00080, Rev. 2 and NR-00095, Rev. 1) which is 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 and put in a labeled bag and placed on ice until frozen. Ancillary fisheries data
including species, total length (mm), 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
I

oxygen, and specific conductance were recorded daily at the surface at each sampling location
(available on request).
5.0 Laboratory Processing and Arsenic, Mercury, and Selenium Analysis
All fish samples were processed individually and analyzed in the trace element laboratory
according to procedure NR-00107, Rev. 4 Trace Element Monitoring Laboratory Procedure.
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 that re-analysis is needed.
6.0 Data Analysis and Reporting
Arsenic, mercury, and selenium concentrations (converted to µg/g wet weight) in the fish muscle
tissue collected during 2019 are shown in Table 1. In addition to the length and weight of each
fish, the dry-to-wet weight ratios are presented to convert the arsenic, mercury, and selenium
concentrations wet weight values back to dry weight values as desired. The 2004 baseline data
are presented as well for comparison purposes (Table 2).
Arsenic
During 2019, all 44 fish collected at all three sample locations were well below the USEPA
recreational screening value of 1.2 µg/g for arsenic (wet weight) (USEPA 2000).
Mercury
All sunfish species collected were below the USEPA recreational screening value of 0.4 µg/g (wet
weight) for mercury(USEPA 2000). One of six Largemouth Bass collected at Station UP, four of
six Smallmouth Bass at location Station DI, and four of five Smallmouth Bass at Station DN were
above the 0.4 µg/g mercury screening value. Two Largemouth Bass collected at Station DN were
below the mercury screening value. When evaluated, Smallmouth Bass appear to be slightly
greater accumulators of mercury compared to Largemouth Bass in the monitored reaches of
French Broad River.
2

Selenium
All fish collected were well below the USEPA recreational fisherman screening of 20 µg/g (wet
weight) (USEPA 2000).
When considered altogether, it does not appear that a pattern of arsenic, mercury, or selenium
accumulation in fish tissues during 2019 would be attributable to the Asheville Plant operations
(Table 2).
7.0 References
DER 2018. Asheville Steam Electric Plant mercury and selenium monitoring of fish in the French
Broad River.New Hill,NC.
USEPA. 2000. Guidance for assessing chemical contaminant data for use in fish advisories. Vol. 1.
Fish sampling and analysis. Third edition. EPA 823-B-00-007. United States Environmental
Protection Agency, Office of Water,Washington,DC.
3

11
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Figure 1. French Broad River arsenic,mercury,and selenium monitoring locations.
4

Table 1. Arsenic, mercury, and selenium concentrations (wet weight) in axial muscle of fish
from the French Broad River during June, October, and November 2019.
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 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.
5

Table 2. Baseline mercury and selenium concentrations (wet weight) in axial muscle of fish
from the French Broad River during August and November 2004.1
Fish Species Locations Month Length Weight Hg Se Dry-to-Wet'
(MM) (g) (µg/g) (µg/g) Weight Ratio
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
Smallmouth 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 198 154 <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
1 Arsenic was not required by permit during baseline monitoring.
' To convert to a dry weight,divide the wet weight concentrations by the dry-to-wet weight ratio.
6

Asheville Steam Station
NPDES Permit No. NC0000396
Mercury and Selenium Monitoring of Fish in the French Broad River
Buncombe County, North Carolina
Duke Energy Progress
April, 2019

Table of Contents
Page
1.0 Introduction....................................................................................................................... 1
2.0 Study Site Description and Sampling Locations .............................................................. 1
3.0 Target Species................................................................................................................... 1
4.0 Field Sampling Methods................................................................................................... 1
5.0 Laboratory Processing and Selenium Analysis................................................................. 2
6.0 Data Analysis and Reporting............................................................................................ 2
7.0 References......................................................................................................................... 3
List of Tables
Page
Table
1 Mercury and selenium concentrations in axial muscle of fish from the
French Broad River during June, October, and November 2018. .................................... 5
2 Baseline mercury and selenium concentrations in axial muscle of fish from the
French Broad River, August and November 2004............................................................ 7
List of Figures
Page
F
1 French Broad River mercury and selenium monitoring locations.................................... 4
i

1.0 Introduction
Duke Energy Progress (DEP) owns and operates the Asheville Steam Station (Asheville Station)
located on the east side of the French Broad River in Buncombe County, Arden, North Carolina. As
required by the Asheville Station's National Pollutant Discharge Elimination System (NPDES)Permit
No. NC0000396 (current prior to December 1, 2018), Special Condition A. (13), monitoring of
mercury and selenium in fish from the French Broad River began after Flue Gas Desulfurization
(FGD) operations commenced in December of 2005. Sampling was conducted according to the
previously approved monitoring plan. This data report is submitted to fulfill the annual monitoring as
required by the above NPDES permit.
2.0 Study Site Description and Sampling Locations
Fish were collected from three locations of 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).
3.0 Target Species
The target fish were black bass (preferred Smallmouth Bass), sunfish (preferred Redbreast
Sunfish) and suckers (preferred Black Redhorse). Where the full complement of preferred target
species were not available, Largemouth Bass, Rock Bass, Spotted Bass, Bluegill, and Golden
Redhorse were substituted as necessary (Table 1). 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).
4.0 Field Sampling Methods
Fish were collected using electrofishing procedures specified in the DEP Biology Program
Procedures Manual (Procedure NR-00080, Rev. 2 and NR-00095, Rev. 1) which is 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 and put in a labeled (date, station, etc.) bag and placed on ice until frozen. Ancillary
fisheries data including species, number, total length (mm), and total weight (g) were also
recorded. Each day collected fish were transferred to a freezer on-site and maintained in the
frozen state until processing at the DEP New Hill Trace Element Laboratory. Associated water
I

quality data including water temperature, dissolved oxygen, and specific conductance were
recorded daily at the surface at each sampling location.
5.0 Laboratory Processing and Mercury and Selenium Analysis
All fish samples were processed in the trace element laboratory according to procedure NR-
00107, Rev. 4 Trace Element Monitoring Laboratory Procedure. Aliquots of the processed
samples (lyophilized left axial muscle; right muscle occasionally included when needed) were
sent to Pace Analytical for analysis (EPA 7374 — Hg, EPA 6020 — Se). Quality control was
achieved utilizing analytical standards, replicates, and certified reference materials. Following
analysis, the processed samples were archived and will be kept at least two years in the event
that re-analysis is needed.
6.0 Data Analysis and Reporting
Mercury and selenium concentrations (converted to µg/g wet weight) in the fish muscle tissue
collected during 2018 are shown in Table 1. In addition to the length and weight of each fish, the
dry-to-wet weight ratios are presented to convert the mercury and selenium concentrations wet
weight values back to dry weight values as desired. The 2004 baseline data are presented as well
for comparison purposes (Table 2). During 2018, 67 of the 88 fish collected at all three sample
locations were below the North Carolina Health Directors Mercury Action Advisory Level of 0.4
µg/g wet weight (NCDHHS 2006). At location UP, one Golden Redhorse, two Redbreast
Sunfish, two Largemouth Bass, two Rock Bass, and two Smallmouth Bass had mercury
concentrations in axial muscle (edible flesh) equivalent to or greater than the advisory level
(highlighted in Table 1). Eight Golden Redhorse and one Smallmouth Bass at location DI had
mercury tissue concentrations above the advisory level while one Redbreast Sunfish and one
Smallmouth Bass at location DN were above the level (also highlighted in Table 1). Based on the
mercury concentrations in fish at all three locations, the bioaccumulation pattern appears to be
random with no apparent contribution of mercury in fish tissues attributable to the Asheville
Station discharge to the French Broad River. During 2018, all fish collected at the three locations
were below the North Carolina human consumption advisory level of 10 µg/g (wet weight) for
selenium, however, two fish (highlighted in Table 1) of 27 fish collected at location DI were
slightly above the USEPA screening value of 2.457 µg/g (wet weight) for subsistence fishermen
(USEPA 2000).
2

7.0 References
NCDHHS. 2006. Health effects of methylmercury and North Carolina's advice on eating fish.
North Carolina Occupational and Environmental Epidemiology Branch. Raleigh,NC.
USEPA. 2000. Guidance for assessing chemical contaminant data for use in fish advisories. Vol. 1.
Fish sampling and analysis. Third edition. EPA 823-B-00-007. United States Environmental
Protection Agency, Office of Water,Washington,DC.
3

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Figure 1. French Broad River mercury and selenium monitoring locations.
4

Table 1. Mercury and selenium concentrations (wet weight) in axial muscle of fish from the
French Broad River during June, October, and November 2018.
Fish Species Locations Month Length Weight Hg Se Dry-to-Wet*
(MM) (g) (µg/g) (µg/g) Weight Ratio
Golden Redhorse UP June 475 959 0.35 0.20 0.20
Golden Redhorse UP June 362 460 0.13 0.17 0.22
Golden Redhorse UP June 350 408 0.14 0.17 0.21
Golden Redhorse UP June 401 564 0.23 0.14 0.19
Golden Redhorse UP June 449 1049 0.31 0.23 0.21
Golden Redhorse UP June 420 616 0.49 0.15 0.20
Golden Redhorse UP June 408 616 0.30 0.20 0.21
Golden Redhorse UP June 456 965 0.35 0.15 0.18
Golden Redhorse UP June 422 736 0.31 0.17 0.21
Golden Redhorse UP June 432 917 0.36 0.22 0.18
Largemouth Bass DI October 253 224 0.20 0.45 0.20
Largemouth Bass UP November 359 701 0.48 0.17 0.20
Largemouth Bass UP November 362 680 0.45 0.22 0.20
Redbreast Sunfish UP June 173 105 0.16 0.29 0.20
Redbreast Sunfish UP June 180 118 0.05 0.40 0.22
Redbreast Sunfish UP June 210 176 0.09 0.53 0.21
Redbreast Sunfish UP June 195 175 0.06 2.12 0.21
Redbreast Sunfish UP June 180 144 0.08 0.28 0.22
Redbreast Sunfish UP June 195 142 0.08 0.63 0.20
Redbreast Sunfish UP June 190 145 0.60 0.24 0.20
Redbreast Sunfish UP June 171 125 0.48 0.26 0.22
Redear Sunfish UP November 234 245 0.17 0.58 0.21
Redear Sunfish UP November 193 124 0.47 0.34 0.21
Rock Bass UP June 220 184 0.17 0.46 0.21
Rock Bass UP June 225 250 0.56 0.39 0.21
Rock Bass UP June 235 249 0.34 0.40 0.21
Rock Bass UP June 212 237 0.58 0.20 0.20
Smallmouth Bass UP June 355 520 0.05 0.75 0.21
Smallmouth Bass UP June 218 121 0.06 0.42 0.20
Smallmouth Bass UP June 230 162 0.43 0.24 0.20
Smallmouth Bass UP June 260 240 0.35 0.31 0.20
Redbreast Sunfish DI October 155 71 0.08 0.20
Redbreast Sunfish DI October 194 170 0.24 0.22 0.20
Bluegill DI October 134 40 0.04 2.20 0.20
Bluegill DI October 137 58 0.06 0.32 0.19
Bluegill DI October 156 80 0.04 1.89 0.20
Bluegill DI October 139 52 0.06 0.35 0.19
Bluegill DI October 134 46 0.10 0.30 0.19
Bluegill DI October 116 32 0.05 0.19
Golden Redhorse DI June 430 798 0.45 0.15 0.17
Golden Redhorse DI June 450 912 0.43 0.21 0.19
Golden Redhorse DI June 440 997 0.43 0.30 0.19
Golden Redhorse DI June 510 1168 0.47 0.16 0.20
Golden Redhorse DI June 535 1401 0.58 0.24 0.20
Golden Redhorse DI June 515 1120 0.42 0.24 0.20
Golden Redhorse DI June 453 843 0.59 0.19 0.19
Golden Redhorse DI June 516 1285 0.38 0.18 0.21
Golden Redhorse DI June 533 1420 0.39 0.14 0.20
Golden Redhorse DI June 425 767 0.47 0.18 0.18
Rock Bass DI October 183 129 0.14 0.24 0.20
Rock Bass DI October 153 76 0.12 0.33 0.20
Rock Bass DI October 167 98 0.11 0.26 0.20
Rock Bass DI October 155 76 0.18 0.43 0.21
Rock Bass DI October 165 83 0.12 0.27 0.20
Rock Bass DI October 190 137 0.12 1.92 0.21
Rock Bass DI October 156 83 0.12 0.36 0.20
Smallmouth Bass DI October 243 210 0.92 0.41 0.21
Smallmouth Bass DI October 243 203 0.19 0.16 0.22
Golden Redhorse DN June 482 1025 0.18 0.39 0.21
Golden Redhorse DN June 451 926 0.37 0.49 0.19
5

(Table 1 cont.)
Fish Species Locations Month Length Weight Hg Se Dry-to-Wet*
(mm) (g) (µg/g) (µg/g) Weight Ratio
Golden Redhorse DN June 415 744 0.38 0.44 0.18
Golden Redhorse DN June 465 1028 0.40 0.38 0.20
Golden Redhorse DN June 432 835 0.18 0.57 0.20
Golden Redhorse DN June 372 509 0.11 0.50 0.21
Golden Redhorse DN June 480 1127 0.39 0.45 0.20
Golden Redhorse DN June 470 985 0.18 0.47 0.21
Golden Redhorse DN June 450 944 0.32 0.49 0.20
Golden Redhorse DN June 442 829 0.33 0.35 0.17
Redbreast Sunfish DN October 176 104 0.17 0.37 0.20
Redbreast Sunfish DN October 161 70 0.17 0.44 0.20
Redbreast Sunfish DN October 144 60 0.17 0.56 0.21
Redbreast Sunfish DN October 128 42 0.08 0.62 0.21
Redbreast Sunfish DN October 180 125 0.06 0.44 0.20
Redbreast Sunfish DN October 169 94 0.10 0.40 0.20
Redbreast Sunfish DN October 180 116 0.11 0.42 0.20
Redbreast Sunfish DN October 195 165 0.15 0.44 0.18
Redbreast Sunfish DN October 184 145 0.12 0.36 0.20
Redbreast Sunfish DN October 182 115 0.08 0.34 0.20
Rock Bass DN June 170 99 0.07 0.46 0.21
Rock Bass DN October 211 171 0.39 0.20
Rock Bass DN October 138 59 0.11 0.62 0.20
Rock Bass DN October 157 82 0.08 0.65 0.20
Rock Bass DN October 180 125 0.29 0.44 0.19
Smallmouth Bass DN June 200 96 0.06 0.50 0.20
Smallmouth Bass DN June 332 478 0.60 0.32 0.20
Smallmouth Bass DN June 228 148 0.28 0.61 0.20
Smallmouth Bass DN October 205 119 0.18 0.44 0.20
Smallmouth Bass DN October 196 94 0.12 0.58 0.20
* To convert to a dry weight,divide the wet weight concentrations by the dry-to-wet weight ratio.
6

Table 2. Baseline mercury and selenium concentrations (wet weight) in axial muscle of fish
from the French Broad River during August and November 2004.
Fish Species Locations Month Length Weight Hg Se Dry-to-Wet*
(MM) (g) (µg/g) (µg/g) Weight Ratio
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 3.6 M 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 EW.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 0.3 0.22
Black redhorse DI August 383 0.25 0.25 0.3 0.21
Black redhorse DI August 457 0.52 0.48 0.5 0.20
Black redhorse DI August 465 0.76 0.21 0.2 0.21
Black redhorse DI August 493 0.69 0.21 0.2 0.21
Black redhorse DI August 475 0.43 0.77 0.8 0.20
Black redhorse DI November 410 <0.18 0.26 0.2 0.20
Smallmouth 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 198 154 <0.16 0.93 0.20
Black redhorse DN August 365 509 <0.2 0.5 0.20
Black redhorse DN August 356 518 0.1 0.3 0.20
Black redhorse DN August 375 651 <0.2 0.8 0.20
Black redhorse DN August 395 755 <0.2 0.5 0.20
Black redhorse DN August 388 810 0.5 0.4 0.21
Black redhorse DN August 423 910 <0.2 0.4 0.19
* To convert to a dry weight,divide the wet weight concentrations by the dry-to-wet weight ratio.
7

Asheville Steam Station
NPDES Permit No. NC0000396
Mercury and Selenium Monitoring of Fish in the French Broad River
Buncombe County, North Carolina
Duke Energy Progress
April, 2018

Table of Contents
Page
1.0 Introduction....................................................................................................................... 1
2.0 Study Site Description and Sampling Locations .............................................................. 1
3.0 Target Species................................................................................................................... l
4.0 Field Sampling Methods................................................................................................... l
5.0 Laboratory Processing and Selenium Analysis................................................................. 2
6.0 Data Analysis and Reporting............................................................................................ 2
7.0 References......................................................................................................................... 3
List of Tables
Page
Table
l Mercury and selenium concentrations in axial muscle of fish from the
French Broad River during June, October, and November 2017. .................................... 5
2 Baseline mercury and selenium concentrations in axial muscle of fish from the
French Broad River, August and November 2004............................................................ 7
List of Figures
Page
Fieure
I French Broad River mercury and selenium monitoring locations.................................... 4
1

1.0 Introduction
Duke Energy Progress (DEP) owns and operates the Asheville Steam Station (Asheville Station)
located on the east side of the French Broad River in Buncombe County, Arden, North Carolina. As
required by the Asheville Station's National Pollutant Discharge Elimination System (NPDES) Permit
No. NC0000396, Special Condition A. (13), monitoring of mercury and selenium in fish from the
French Broad River began after Flue Gas Desulfurization (FGD) operations commenced in December
of 2005. Sampling was conducted according to the previously approved monitoring plan. This data
report is submitted to fulfill the monitoring program as required by the NPDES permit.
2.0 Study Site Description and Sampling Locations
Fish were collected from three locations of 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).
3.0 Target Species
The target fish were black bass (preferred Smallmouth Bass), sunfish (preferred Redbreast
Sunfish) and suckers (preferred Black Redhorse). Where the full complement of preferred target
species were not available, Largemouth Bass, Rock Bass, Spotted Bass, Bluegill, and Golden
Redhorse were substituted as necessary (Table 1). 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).
4.0 Field Sampling Methods
Fish were collected using electrofishing procedures specified in the DEP Biology Program
Procedures Manual (Procedure NR-00080, Rev. 1) which is 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 and put in a
labeled (date, station, etc.) bag and placed on ice until frozen. Ancillary fisheries data including
species, number, total length (mm), and total weight (g) were also recorded. Each day collected
fish were transferred to a freezer on-site and maintained in the frozen state 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.
I

5.0 Laboratory Processing and Mercury and Selenium Analysis
All fish samples were processed in the trace element laboratory according to procedure NR-
00107, Rev. 4 Trace Element Monitoring Laboratory Procedure. Aliquots (0.15 grams) of the
processed samples (lyophilized left axial muscle; right muscle occasionally included when
needed) were analyzed for mercury and selenium by x-ray spectrophotometry. Quality control
was achieved utilizing analytical standards, replicates, and certified reference materials.
Following analysis, the processed samples were archived and will be kept at least two years in
the event that re-analysis is needed.
6.0 Data Analysis and Reporting
Mercury and selenium concentrations (converted to µg/g wet weight) in the fish muscle tissue
collected during 2017 are shown in Table 1. In addition to the length and weight of each fish, the
dry-to-wet weight ratios are presented to convert the mercury and selenium concentrations wet
weight values back to dry weight values as desired. The 2004 baseline data are presented as well
for comparison purposes (Table 2). During 2017, 80 of the 90 fish collected at all three sample
locations were below the North Carolina Health Directors Mercury Action Advisory Level of 0.4
µglg wet weight (NCDHHS 2006). At location UP, one Black Redhorse, one Smallmouth Bass,
and one Spotted Bass had mercury concentrations in axial muscle (edible flesh) equivalent to or
greater than the advisory level (highlighted in Table 1). Only one fish at location DI, a Rock
Bass, had mercury tissue concentrations above the advisory level while two Golden Redhorse and
three Smallmouth Bass at location DN were above the level (also highlighted in Table 1). Based
on this mercury bioaccumulation pattern, there was no apparent contribution of mercury in fish
tissues that was attributable to the Asheville Station discharge to the French Broad River. During
2017, all fish collected at the three locations were below the North Carolina human consumption
advisory level of 10 µg/g (wet weight) for selenium, however, three fish (highlighted in Table 1)
of thirty fish collected at location DI were slightly above the USEPA screening value of 2.457
µg/g (wet weight) for subsistence fishermen (USEPA 2000).
2

7.0 References
NCDHHS. 2006. Health effects of methylmercury and North Carolina's advice on eating fish.
North Carolina Occupational and Environmental Epidemiology Branch. Raleigh,NC.
USEPA. 2000. Guidance for assessing chemical contaminant data for use in fish advisories. Vol. 1.
Fish sampling and analysis. Third edition. EPA 823-B-00-007. United States Environmental
Protection Agency, Office of Water, Washington,DC.
3

r
"PM
ti r \ �� J "�t
7

Table 1. Mercury and selenium concentrations (wet weight) in axial muscle of fish from the
French Broad River during June, October,and November 2017.
Fish Species Locations Month Length Weight Hg Se Dry-to-Wet*
(min) (g) (µpig) (µglg) Weight Ratio
Redbreast Sunfish UP June 206 227 0.24 034 - 020
Redbreast Sunfish UP June 196 166 0.21 036 021
Redbreast Sunfish UP June 123 120 008 0,28 020
Redbreast Sunfish UP June 183 136 0 11 033 0 19
Redbreast Sunfish UP June 187 135 007 033 020
Redbreast Sunfish UP June 184 121 Oil 037 0 18
Redbreast Sunfish UP June 188 141 0 12 030 019
Redbreast Sunfish UP June 180 126 0 15 035 019
Redbreast Sunfish UP June 171 113 <0 05 1 12 020
Redbreast Sunfish UP June 164 94 Oil 042 020
Smallmouth Bass UP June 377 555 090 0 17 0 19
Smallmouth Bass UP June 300 369 025 024 0.19
Smallmouth Bass UP June 319 450 039 027 020
Smallmouth Bass UP Junc 245 211 039 045 020
Smallmouth Bass UP June 270 262 029 095 0.20
Rock Bass UP June 221 236 0,23 039 0.20
Rock Bass UP June 221 245 029 036 0.19
Rock Bass UP June 213 200 0.15 0,55 019
Rock Bass UP June 198 190 019 0.37 019
Spotted Bass UP June 316 464 0.50 0.37 019
Black Redhorse UP June 455 1062 0.22 025 0 19
Black Redhorse UP June 395 530 014 019 0.20
Black Rcdhorse UP June 397 593 036 0.23 020
Black Redhorse UP June 443 838 0.22 017 020
Black Redhorse UP June 400 615 031 021 020
Black Redhorsc UP June 442 741 0.27 016 020
Black Redhorse UP June 407 788 018 0.22 021
Black Redhorse UP June 457 924 0.49 024 022
Black Redhorsc UP June 447 744 026 016 021
Black Rcdhorse UP June 446 764 034 019 0 19
Redbreast Sunfish DI June 204 178 0 10 041 0.21
Redbreast Sun fish DI October 159 82 008 1.27 019
Redbreast Sunfish D1 October 153 60 0.14 2.50 0.19
Redbreast Sunfish D1 October 168 75 <0 05 095 0.20
Redbreast Sunfish Di October 162 67 <0 05 2.56 0.19
Redbreast Sunfish DI October 167 80 <0.05 061 0.16
Redbreast Sunfish DE October 181 84 <0 05 0.36 0.17
Blucgill DE June 170 122 014 0,64 017
Bluegdl DE June 150 69 -0.05 3.92 018
Blucgill DI June 153 68 0.09 0.69 0.21
Smallmouth Bass DI June 205 128 0.20 0.22 0.20
Smallmouth Bass DI June 188 90 0 14 028 0.21
Smallmouth Bass DI June 314 424 0 15 016 0.20
Smallmouth Bass DI June 311 460 0.26 0.29 0 19
Smallmouth Bass DI June 181 79 0.21 036 020
Smallmouth Bass DI June 201 110 024 0.42 019
Smallmouth Bass DI June 191 99 0 15 0.64 020
Smallmouth Bass DI June 202 118 023 037 021
Smallmouth Bass DI October 358 640 034 016 0 21
Rack Bass DI June 217 238 0.48 026 0 21
Golden Redhorse DI June 383 626 0,30 024 0,20
Golden Redhorse DI June 444 958 0,30 020 0 19
Golden Redhorse DI June 421 852 0.34 021 020
Golden Redhorse DI June 408 774 0,23 0,24 0.22
Golden Redhorse DI June 450 906 0-30 0,22 0.20
Golden Redhorsc DI June 435 826 031 0.41 0.21
Golden Redhorse DI June 440 942 031 067 021
Golden Rcdhorse DI June 427 942 0.29 1.52 0.21
Black Redhorse DI June 450 1072 0 39 0.25 0.20
Black Redhorse DI June 505 1200 0.49 0.22 021
5

(Table 1 cont.)
Fish Species Locations Month Length Weight Hg Se Dry-to-Wet*
mm Weight Ratio
Redbreast Sunfish ON June 174 122) 0,24 0.75 020
Redbreast Sunfish ON June 184 116 0,21 0.69 0 19
Redbreast Sunfish ON June 139 62 008 0.77 020
Redbreast Sunfish ON November 172 90 0 11 0.79 0 19
Redbreast Sunfish ON November 175 102 0,07 047 019
Redbreast Sunfish ON November 180 115 0 11 0.66 020
Redbreast Sunfish ON November 195 116 0.12 0.65 020
Redbreast Sunfish ON November 186 106 O 15 067 0 19
Redbreast Sunfish ON November 180 97 <0.05 079 019
Redbreast Sunfish ON November 193 132 0.11 0.23 020
Smallmouth Bass ON June 307 356 0.26 081 020
Smallmouth Bass ON June 168 70 023 055 0 19
Smallmouth Bass ON June 281 284 035 045 0 19
Smallmouth Bass ON June 273 288 0.24 071 020
Smalimouth Bass ON June 282 302 030 083 020
Smallmouth Bass ON June 315 4 IS 0.42 074 021
Smallmouth Bass ON June 408 746 0.51 045 020
Smallmouth Bass ON June 285 325 0.42 071 020
Smallmouth Bass ON June 180 86 0.20 062 020
Smallmouth Bass DN June 173 68 0 Is 080 018
Black Redhorse DN October 515 1200 038 057 019
Golden Redhorse ON October 441 1000 033 073 019
Golden Redhorse ON October 464 10" 036 073 019
Golden Redhorsc ON October 426 822 036 060 0 18
Golden Redhorse ON October 437 938 028 0 74 019
Golden Redhorse ON October 443 998 026 063 0 18
Golden Redhorse ON October 446 982 038 066 0 19
Golden Redhorse ON October 474 1175 0.53 063 0 18
Golden Redhorse ON October 545 1350 0.57 045 0 18
Golden Redhorse ON October 421 870 028 046 0 17
To convert to a dry weight,divide the wet weight concentrations by the dry-to-wet%%-eight ratio
6

Table 2. Baseline mercury and selenium concentrations (wet weight) in axial muscle of fish
from the French Broad River during August and November 2004.
Fish Species Locations Month Length Weight Hg Se Dry-to-Wet*
(min) (g) (µglg) (µg/g) Weight Ratio
Smallmouth bass UP August 246 201 087 039 022
Smallmouth bass UP August 297 370 0.49 036 021
Smallmouth bass UP August 346 620 044 022 022
Smallmouth bass UP August 445 1_300 1.66 031 0.24
Smallmouth bass UP August 370 744 149 030 020
Redbreast sunfish UP August 172 106 <0 I8 0.28 0.20
Redbreast sunfish UP August 160 87 032 024 020
Redbreast sunfish UP August 145 72 <0 27 039 030
Redbreast sunfish UP August 149 60 <0 17 0.25 0.21
Redbreast sunfish UP August 190 160 0 12 0.32 020
Black redhorse UP August 372 540 <0 15 026 021
Black redhorse UP August 380 550 <0 17 019 021
Black redhorse UP August 410 790 0.53 0-26 020
Black redhorse UP August 413 843 0.54 0.24 019
Black redhorse UP August 415 989 0.40 030 020
Black redhorse UP August 405 863 0.46 030 020
Largemouth bass DI August 475 1.725 0.74 123 021
Largemouth bass DI August 395 611 <0 16 146 020
Largemouth bass DI August 405 795 017 021 021
Smallmouth bass DI August 263 223 0.52 032 022
Smallmouth bass DI August 355 565 0.54 4.14 022
Smallmouth bass DI August 374 871 027 047 023
Smallmouth bass DI August 368 802 074 025 022
Smallmouth bass DI August 440 1.300 0.99 045 022
Redbreast sunfish DI August 136 52 <0 19 381 021
Redbreast sunfish Di August 183 108 <0 17 3.61 019
Redbreast sunfish DI August 164 80 020 0.57 020
Redbreast sunfish DI August M 128 <0 15 0-69 019
Redbreast sunfish DI August 177 109 0.74 1.23 0.20
Redbreast sunfish DI August 149 58 <0 16 1.46 020
Black redhorse DI August 375 <0 18 0,26 03 022
Black redhorse DI August 383 025 025 03 021
Black redhorse DI August 457 052 0.48 0,5 020
Black redhorse DI August 465 076 021 0,2 021
Black redhorse DI August 493 069 021 0.2 021
Black redhorse DI August 475 043 0.77 0.8 020
Black redhorse DI November 410 <0 IS 026 02 020
Smallmouth bass DN November 277 265 029 057 021
Smallmouth bats DN November 295 410 032 0 15 021
Smallmouth bass DN November 310 460 0.77 035 022
Smallmouth bass DN November 347 620 068 0.33 022
Smallmouth bass DN November 345 750 0.40 0.29 0.22
Bluegdl DN August 135 59 <016 0,33 020
Redbreast sunfish DN August 162 66 032 0.83 0.20
Redbreast sunfish DN August 175 96 <0.18 076 0.22
Redbreast sunfish DN August 185 139 0,25 0.31 019
Redbreast sunfish DN August 198 156 <0 15 0.27 019
Redbreast sunfish DN August 273 324 0,54 019 021
Redbreast sunfish DN August 126 46 <0 14 0-41 020
Redbreast sunfish DN August 187 170 012 073 020
Redbreast sunfish DN August 198 154 <0 16 093 020
Black redhorse DN August 365 509 <0 2 O.5 020
Black redhorse DN August 356 518 01 0.3 020
Black redhorse DN August 375 651 <0 2 OR 020
Black redhorse DN August 395 755 <0 2 0.5 020
Black redhorse DN August 388 810 0.5 0.4 021
Black redhorse DN August 423 910 <0,2 0.4 0 19
• To convert to a dry weight.divide the wet weight concentrations by the dry-to-wet aright ratio.
7

Young, Brianna A
From: Young, Brianna A
Sent: Wednesday,April 12, 2023 3:32 PM
To: Riddle, Shawna
Subject: RE: Asheville Steam Electric Plant (NCS000575)
Thank you, Shawna! I'll get the draft updated and then out to public notice again. We will have to notice again since
monitoring is getting less strict.
Brianna Young, MS(she/her/hers)
Industrial Individual Permits Coordinator
Stormwater Permitting Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
[e-mail](e-mail preferred)
919-707-3647 (office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
Email correspondence to and from this address is subject to the North Carolina
Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Please check with the appropriate staff before visiting our offices,
as we may be able to handle your requests by phone or email.We appreciate your patience as we continue to serve the public
during this challenging time.
From: Riddle, Shawna <[e-mail]>
Sent: Wednesday,April 12, 2023 2:04 PM
To:Young, Brianna A<[e-mail]>
Subject: RE:Asheville Steam Electric Plant(NCS000575)
Brianna-
Hey. I reviewed the comments that Duke submitted requesting to remove specific outfalls from the permit.ARO
confirms that current site conditions reflect their updated fact sheet and requests. Please let me know if you have any
questions.
Thanks
Shawna
Shawna Riddle
Environmental Program Consultant
Division of Energy, Mineral and Land Resources
North Carolina Department of Environmental Quality
Swa Hwy 70
Swannanoa, NCC
28778
• -'--•�a•• '� 828.296.4500 (Office) 828.299.7043 (Fax)
[e-mail]
Email correspondence to and from this address is subject to the
1

North Carolina Public Records Law and may be disclosed to third parties.
From:Young, Brianna A<[e-mail]>
Sent:Wednesday,April 12, 2023 8:32 AM
To: Riddle, Shawna <[e-mail]>
Subject: RE:Asheville Steam Electric Plant(NCS000575)
Thanks, Shawna!
Brianna Young, MS(she/her/hers)
Industrial Individual Permits Coordinator
Stormwater Permitting Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
[e-mail](e-mail preferred)
919-707-3647 (office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
Email correspondence to and from this address is subject to the North Carolina
Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Please check with the appropriate staff before visiting our offices,
as we may be able to handle your requests by phone or email.We appreciate your patience as we continue to serve the public
during this challenging time.
From: Riddle, Shawna <[e-mail]>
Sent:Tuesday, April 11, 2023 1:29 PM
To:Young, Brianna A<[e-mail]>
Subject: RE:Asheville Steam Electric Plant(NCS000575)
Brianna-
Hey. I will review the changes and send my comments to you tomorrow.
Thanks
Shawna
Shawna Riddle
Environmental Program Consultant
Division of Energy, Mineral and Land Resources
North Carolina Department of Environmental Quality
2090 US Hwy 70
D E Swannanoa, NC 28778
C­.1F,- 828.296.4500 (Office) 828.299.7043 (Fax)
[e-mail]
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
2

From:Young, Brianna A<[e-mail]>
Sent:Wednesday,April 5, 2023 8:31 AM
To: Riddle, Shawna <[e-mail]>
Subject: RE:Asheville Steam Electric Plant(NCS000575)
Hi Shawna,
Just wanted to follow up on my previous email. Have you been able to look through the comments yet? Duke Energy is
requesting significant changes and I want to make sure the site conditions reflect their requests. With the level of
changes they are requesting, the permit would need to go out to public notice a second time.
Thanks!
Brianna
Brianna Young, MS(she/her/hers)
Industrial Individual Permits Coordinator
Stormwater Permitting Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
[e-mail](e-mail preferred)
919-707-3647 (office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
Email correspondence to and from this address is subject to the North Carolina
Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Please check with the appropriate staff before visiting our offices,
as we may be able to handle your requests by phone or email.We appreciate your patience as we continue to serve the public
during this challenging time.
From:Young, Brianna A
Sent:Thursday, March 23, 2023 8:57 AM
To: Riddle, Shawna <[e-mail]>
Subject: RE:Asheville Steam Electric Plant(NCS000575)
Hello Shawna,
Would you be able to look through the comments Duke submitted on the fact sheet during the public notice and
confirm everything is accurate? I want to make sure the outfalls they are asking to be removed from the permit are
appropriate.
Thanks,
Brianna
Brianna Young, MS(she/her/hers)
Industrial Individual Permits Coordinator
Stormwater Permitting Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
3

[e-mail](e-mail preferred)
919-707-3647 (office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
Email correspondence to and from this address is subject to the North Carolina
Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Please check with the appropriate staff before visiting our offices,
as we may be able to handle your requests by phone or email.We appreciate your patience as we continue to serve the public
during this challenging time.
From:Young, Brianna A
Sent: Wednesday, March 22, 2023 3:33 PM
To: Riddle, Shawna <[e-mail]>; Smith, Mike M <[e-mail]>
Cc:Aiken, Stan E <[e-mail]>
Subject: RE:Asheville Steam Electric Plant(NCS000575)
Thank you, Shawna.
Brianna Young, MS(she/her/hers)
Industrial Individual Permits Coordinator
Stormwater Permitting Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
[e-mail](e-mail preferred)
919-707-3647 (office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
Email correspondence to and from this address is subject to the North Carolina
Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Please check with the appropriate staff before visiting our offices,
as we may be able to handle your requests by phone or email.We appreciate your patience as we continue to serve the public
during this challenging time.
From: Riddle, Shawna <[e-mail]>
Sent: Wednesday, March 22, 2023 3:29 PM
To:Young, Brianna A<[e-mail]>; Smith, Mike M <[e-mail]>
Cc:Aiken, Stan E <[e-mail]>
Subject: RE:Asheville Steam Electric Plant(NCS000575)
Brianna-
ARO can confirm that all coal ash subject to stormwater has been removed and/or disposed of in the onsite capped
landfill. If you have additional questions- please let me know.
Thanks
Shawna
4

Shawna Riddle
Environmental Program Consultant
Division of Energy, Mineral and Land Resources
North Carolina Department of Environmental Quality
2090 US Hwy 70
Swannanoa, NC 28778
828.296.4500 (Office) 828.299.7043 (Fax)
[e-mail]
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From:Young, Brianna A<[e-mail]>
Sent: Wednesday, March 22, 2023 10:09 AM
To: Smith, Mike M <[e-mail]>; Riddle, Shawna <[e-mail]>
Cc:Aiken, Stan E <[e-mail]>
Subject: RE:Asheville Steam Electric Plant(NCS000575)
Good morning,
Is ARO staff able to address the questions below? I have not received a response so wanted to follow up in case this
email got lost in the shuffle.
Thanks,
Brianna
Brianna Young, MS(she/her/hers)
Industrial Individual Permits Coordinator
Stormwater Permitting Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
[e-mail](e-mail preferred)
919-707-3647 (office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
Email correspondence to and from this address is subject to the North Carolina
Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Please check with the appropriate staff before visiting our offices,
as we may be able to handle your requests by phone or email.We appreciate your patience as we continue to serve the public
during this challenging time.
From:Young, Brianna A
Sent:Thursday, March 9, 2023 11:27 AM
To: Smith, Mike M <[e-mail]>; Riddle, Shawna <[e-mail]>
Cc:Aiken, Stan E <[e-mail]>
Subject:Asheville Steam Electric Plant(NCS000575)
Good morning,
5

I am finalizing the stormwater permit for the Asheville Steam Electric Plant (NCS000575) and wanted to confirm some
items. Duke Energy submitted extensive comments on the draft permit focusing around changes to the site that would
result in monitoring changes in the permit(see attached). Can ARO confirm that all coal ash onsite has been
removed/landfilled and that there is no potential exposure to stormwater for any of the outfalls?
Thank you,
Brianna Young, MS(she/her/hers)
Industrial Individual Permits Coordinator
Stormwater Permitting Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
[e-mail](e-mail preferred)
919-707-3647 (office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
D 0
,:�:���� E_
NORTH CAROLINA - ki -10)
Department of Environmental Quality
Email correspondence to and from this address is subject to the North
Carolina Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Please check with the appropriate staff before visiting our offices,
as we may be able to handle your requests by phone or email.We appreciate your patience as we continue to serve the public
during this challenging time.
6

Young, Brianna A
From: Riddle, Shawna
Sent: Wednesday, March 22, 2023 3:29 PM
To: Young, Brianna A; Smith, Mike M
Cc: Aiken, Stan E
Subject: RE: Asheville Steam Electric Plant (NCS000575)
Brianna-
ARO can confirm that all coal ash subject to stormwater has been removed and/or disposed of in the onsite capped
landfill. If you have additional questions- please let me know.
Thanks
Shawna
Shawna Riddle
Environmental Program Consultant
Division of Energy, Mineral and Land Resources
North Carolina Department of Environmental Quality
2090 US Hwy 70
Swa
_ Swannanoa, NC
28778
�w-- --�� � 828.296.4500 (Office) 828.299.7043 (Fax)
[e-mail]
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From:Young, Brianna A<[e-mail]>
Sent: Wednesday, March 22, 2023 10:09 AM
To: Smith, Mike M <[e-mail]>; Riddle, Shawna <[e-mail]>
Cc:Aiken, Stan E <[e-mail]>
Subject: RE:Asheville Steam Electric Plant(NCS000575)
Good morning,
Is ARO staff able to address the questions below? I have not received a response so wanted to follow up in case this
email got lost in the shuffle.
Thanks,
Brianna
Brianna Young, MS(she/her/hers)
Industrial Individual Permits Coordinator
Stormwater Permitting Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
[e-mail](e-mail preferred)
919-707-3647 (office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
1

Physical address: 512 North Salisbury Street, Raleigh, NC 27604
Email correspondence to and from this address is subject to the North Carolina
Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Please check with the appropriate staff before visiting our offices,
as we may be able to handle your requests by phone or email.We appreciate your patience as we continue to serve the public
during this challenging time.
From:Young, Brianna A
Sent:Thursday, March 9, 2023 11:27 AM
To: Smith, Mike M <[e-mail]>; Riddle, Shawna <[e-mail]>
Cc:Aiken, Stan E <[e-mail]>
Subject:Asheville Steam Electric Plant(NCS000575)
Good morning,
I am finalizing the stormwater permit for the Asheville Steam Electric Plant (NCS000575) and wanted to confirm some
items. Duke Energy submitted extensive comments on the draft permit focusing around changes to the site that would
result in monitoring changes in the permit(see attached). Can ARO confirm that all coal ash onsite has been
removed/landfilled and that there is no potential exposure to stormwater for any of the outfalls?
Thank you,
Brianna Young, MS(she/her/hers)
Industrial Individual Permits Coordinator
Stormwater Permitting Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
[e-mail](e-mail preferred)
919-707-3647 (office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
D E "7'�`
IQ 10�
NORTH CAROLINA -
Department of Environmental Quality
Email correspondence to and from this address is subject to the North
Carolina Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Please check with the appropriate staff before visiting our offices,
as we may be able to handle your requests by phone or email.We appreciate your patience as we continue to serve the public
during this challenging time.
2

�•� DUKE Keith Douthit
EN E RGY. Plant General Manager
PROGRESS Asheville Combined Cycle Station
Duke Energy Progress
ASVL PLT 146 Duke Energy Lane
Delivered via email Arden,NC28704
o: 828-650-0620
File: 12520R/ENV-30-32 f 828.650-0701
[e-mail]
February 27, 2023
Ms. Brianna Young
Industrial Individual Permits Coordinator
Stormwater Permitting Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
1612 Mail Service Center
Raleigh, NC 27699-1617
Subject: Asheville Steam Electric Generating Plant
Draft NPDES Permit NCS000575
Response to comment period
Dear Ms. Young:
Duke Energy Progress, LLC/AshevillePlantreceived the draft NPDES permit NCS000575 on January 26,
2023, and respectfully submit the attached comments.
Since our timely renewal application in November 2020 and subsequent updates requested in June 2022,
Asheville Plant has achieved a few major milestones. In June of 2022,all remaining ash was successfully
excavated from the 1964 ash basin. NC DEQ DWR and DWM responded in October of 2022 that Duke
Energy had complied with closure requirements in accordance with Coal Ash Management Act of 2014 with a
closure report for the 1964 basin and a corrective action plan (CAP) for the site. The CAP was submitted in
November of 2022 and a request for a Surface Water Assessment and monitoring was received from NC DEQ
in January of 2023. These milestones point to concurrence with DEQ,that all Coal Ash has been removed
and/or properly disposed in the onsite capped and in process of final closure, landfill. Portions of these
documents are attached as reference for the basis of comments to this draft permit.
Should you have questions or need additional information regarding this notification, please contact Teresa
Williams, at(828) 650-0610 or Don Safrit,at(919) 546-6146.
Sincerely,
Keith Douthit
Asheville Plant Manager
cc: Asheville Regional Office(via email)
Attachments
NCS000575 Fact sheet w/tracked comments
NCS000575 Draft permit w/tracked comments
01.09.23 Asheville NCDEQ Surface Water Evaluation(only sections applicable to Asheville)
10.17.22 NCDEQ Compliance with NC CAMA

NCS000575 Fact sheet w/tracked comments

DEQ / DEMLR
FACT SHEET FOR NPDES INDUSTRIAL INDIVIDUAL
STORMWATER PERMIT DEVELOPMENT
Basic Information for Permit Issuance and Renewals:
Permit Writer/Date Brianna Young 1/24/2023
Permit Number NCS000575
Owner/Facility Name Duke Energy Progress,LLC/Asheville Steam
Electric Power Plant
SIC(NAICS)Code/Category 4911 /Electric Services
Basin Name/Sub-basin number French Broad/04-03-02
Receiving Stream/HUC 003:Powell Creek(Lake Julian)/060101050704
009: UT to French Broad River/060101050704
010: UT to French Broad River/060101050704
011: UT to French Broad River/060101050704
012: UT to French Broad River/060101050704
Stream Classification/Stream Segment 003: C/6-62
009: B/6-(54.75)
010: B/6-(54.75)
011: B/6-(54.75)
012: B/6-(54.75)
Is the stream impaired[on 303(d)list]? No
Any TMDLs? No(Statewide Mercury)
Any threatened and/or endangered species? See Section 2(below)
Any compliance concerns? See Section 2(below)
Any permit mods since last permit? See Section 1 (below)
New expiration date XX/XX/2028
Comments on Draft Permit? See Section 6(below)
Section 1. Facility Activities and Process:
The Duke Energy Asheville Steam Electric Station is a former coal fired steam electric plant that was
retired in January 2020. Coal combustion residual (CCR) from the original steam electric plant was
collected in an ash basin constructed in conjunction with the original steam electric plant in 1964. The
original coal fired steam electric plant has been replaced by a natural gas burning combined cycle
station. Duke Energy has also built a CCR landfill for removal of CCR from the original 64-ash basin to
facilitate the closure of the 64-ash basin.
Per an email dated 7/6/2022, construction was completed April 1, 2021 and ash placement completed in
June 2022. Inclusion in the SPPP, and sampling began in in the second quarter of 2021 concurrent with
operation, and closure of the landfill will occur by year end of 2022. (Duke Energy comment) NC DEQ
acceptance of compliance with CAMA occurred on 10/1712022. The groundwater Corrective Action
Plan was submitted in November of 2022 and subsequent request for a surface water assessment plan
that includes sampling down-gradient of SW009, SW010, SW012 and SW013. As of this fact sheet, all
Coal Ash subject to stormwater has been excavated and placed in the onsite landfill, where the final
cover system construction was completed in January 2023.
Changes at the facility since the last permit renewal include:
• SW001: Drainage and discharge area modified in 2020 to support coal-fired Unit I and Unit 2
decommissioning and coal combustion product project activities. Modifications include removal
of the former coal storage railroad tracks and construction of a grass-covered berm and drainage
Page 1 of 13

features. An asphalt curb was installed along the back haul road to divert the SW001 drainage
area industrial stormwater runoff associated with the road to the SW003 drainage area. No
industrial activity is currently in the drainage area.
• SW007 and SW008 were never constructed and Duke Energy no longer plans to construct the
south haul road.
• Construction on the Combined Cycle Station was completed and the coal-fired Units 1 and 2
were retired in 2020. Stormwater drains adjacent to the station's powerhouse flow into two
stormwater collection basins and discharge though stormwater outfalls SW009 and SWO10 to a
wetland area and then to the French Broad River.
• An industrial landfill for the disposal of CCR from an on-site ash basin was built. Stormwater
that falls on the landfill's access roads and haul road will flow into trenches that drain to two
stormwater collection basins (SWO11 and SW012). Due to facility activity and grading
constraints, SW013 was not built and the stormwater from the CCR landfill haul road is included
in the SW012 drainage area. (Duke Enemy comment) Since ash removal completion in June 2022,
the haul road has been removed, the landfill capped. Landfill and stormwater channels have been
covered with AstroTurf. Maintenance access roads remain and stormwater ponds are in process of
being converted to post construction wet ponds. These areas are also permitted under an NC DEQ
Erosion and Sediment Control permit and a Buncombe County Stormwater Permit.
The previous permit(which was issued in 2016)had a public hearing. With the current permit renewal
application, Duke Energy has requested that the following outfalls be removed from the permit:
• SW001: No longer discharges after site modifications
• SW007: Outfall never built
• SW008: Outfall never built
• SW013: Outfall never built
The inspection report from a site visit conducted in October 2020 noted the following items. Duke
Energy provided updates on these items in July 2022:
• The "plugged" status of the stormwater infrastructure on the NE corner of the facility could not
be confirmed during the inspection. To confirm that no stormwater with the potential of being
impacted by operations on site is or can discharge the permittee shall assess and document the
status of all related stormwater infrastructure in the Stormwater Pollution Prevention Plan.
o Duke Energy response: The pipe in question was abandoned and all plant area drains
closed on the operating side of the former coal station. The Demolition group performed
closure on the plant side as former coal pile had been removed. They have a separate
Erosion and Sediment control plan and are separate from operational flows. The pipe was
removed and the areas have no discreet discharge point.
• An area adjacent to the removed section of railroad at the NE corner of the facility was observed
to have the potential to discharge stormwater impacted by the processes on site into Lake Julian.
The permittee shall confirm the status of this area, modify the monitoring procedures on site as
necessary and include those changes in the next permit renewal.
o Duke Energy response: This item is the same area discussed where the former rail bed
was removed. There is no outfall and industrial stormwater is separately collected and
discharged as part of the NPDES wastewater permit.
• Stormwater potentially impacted by the processes on site at the location of the current Stilling
basin and future Leachate collection system is discharging to Powell Creek. The permittee shall
confirm the status of area, modify the monitoring procedures on site as necessary and include
those changes in the next permit renewal.
o Duke Energy response: The stilling pond(NPDES outfall 001) and the leachate tank
Page 2 of 13

(piped directly to MSD-Metropolitan Sewerage District of Buncombe County)have no
stormwater that flows from either area and there are no piped discharges. The
surrounding area is covered by an Erosion and Sediment Control permit.
The inspection report from a site visit conducted in October 2022 states outfalls have been requested to
be removed from the permit: SW001 no longer discharges (drainage area diverted to SW003), SW007
and SW008 will not be constructed, and SW013 (associated with the CCR Landfill)will not be
constructed and the drainage area will be discharged through SW012.
Outfall SW003:
Drainage area consists of the back haul road. Discharge structure consists of concrete piping and riprap- lined ditch
to Lake Julian. Potential pollutants include: Dust, seal cembustieresiduals, etre1eum, and sediment. Duke
Enemy comment) Coal Combustion residuals ceased being hauled off site in 2020 as the ash landfill was
constructed. There are no chemicals or oil filled equipment located in this drainage area. Delivery vehicles access
this road and are escorted while on site.
Outfall SW009:
Drainage area consists of the combined cycle station area (fie' oil „n',.adin. area ,.semi.,,' ',,actin.„a',,adin.
areas liquid storage tanks, and sw tehxya ). Discharge structure is a stormwater detention basin (East Stormwater
Collection Basin) discharging through a eefrdgmed.aeW pipe to a wetland area that discharges to the French Broad
River. Limestone riprap and floc socs are utilized in the drainage area ditches. Potential pollutants include:
Petroleum, water- tfeatment building ehemieals (Phosphate, Aqueous Ammonia, Citr-ie and SulfttFie Aeid, Sedium
Hydroxide, Sodium Hypoehlor-ite, Fleeetila is and Clarifying aged), and sediment. (Duke EneMy comment)
Drainage area and containments around fuel tanks at fuel unloading is a containment that drains to a sump then an
OWS then flows to NPDES outfall 001 in NC0000396. Chemical unloading areas are also in containment that drain
to water treatment sump or turbine building sump, both which discharge to NPDES outfall 001. Chemical
unloading sump drains to NPDES wastewater collection sump and then to NPDES outfall 001. The ammonia
storage tanks on the east side are the only outside containment that is locked and inspected/attended when
stormwater is released. This area is being decommissioned as the station does not inject ammonia for air pollution
control. The ammonia is scheduled to be recycled to an of customer for beneficial use before Q2 2023.
Corrugated metal discharge pipe has been replaced with a concrete standpipe and platform that includes a ball
valve that can be closed in the event of some type of spill to facilitate stopping contaminant from making it to
wetlands and river. This is being incorporated in Asheville Plant SPCC and Emergency Plans. Transformers also
drain into turbine building sumps to NPDES outfall 001.
Outfall SWO10:
Drainage area consists of the combined cycle station area(ftlel oil,,,,',,,,ding areas, ,.hor..,iea
). Discharge structure is a stormwater
detention basin(West Stormwater Collection Basin) discharging through a^,.f..,,gatea ffw pipe to a
wetland area that discharges to the French Broad River. Potential pollutants include: Petf lets.,.,w er-
, and sediment. (Duke Energy
comment) See comments from Outfall SW009
Outfall SWO11:
Drainage area consists of the CCR landfill area and receive discharge from the access roads and-eealesh-
hatt! . Discharge structure consist of a stormwater detention basin discharging into an energy
dissipator that discharges to the French Broad River. Potential pollutants include: Dust, eeal eemb„s
osidu ls,Netreleum, and sediment. (Duke Energy comment) Coal Combustion residuals ceased being hauled to
the ash landfill in June of 2022 and the haul road restored. There are no chemicals or oil filled equipment in this
Page 3 of 13

drainage area. Landfill has completed the final cover system construction in January 2023, only maintenance
access roads to perform inspections remain. This outfall is also covered by NC DEQ Erosion and Sediment Control
permit and Buncombe County Stormwater Permit.
Outfall SWO12:
Drainage area consists of the CCR landfill area and receive discharge from the access roads and eeal as
haul read. Discharge structure consist of a stormwater detention basin discharging into an energy
dissipator that discharges to the French Broad River. Potential pollutants include: Dust, eeal ,.,.mbtistio
osidu ls, retr-a eu , and sediment. (Duke Ene=comment)see comments from Outfall SW011.
Additional outfalls:
• Outfall SW001 no longer receives industrial stormwater runoff due to site modifications.
• Outfall SWO02 removed from the permit in May 2017.
• Outfalls SW004, SW005, and SWO06 are not associated with industrial activities.
• Outfalls SW007, SW008, and SWO13 were never built.
Why Industrial Sites with Stormwater are Subject to a Permit: Federal NPDES regulations define
stormwater discharge associated with industrial activity in 40 CFR §122.26 (b)(14) as: "the discharge
from any conveyance that is used for collecting and conveying storm water and that is directly related to
manufacturing, processing or raw materials storage areas at an industrial plant. The term does not
include discharges from facilities or activities excluded from the NPDES program under this part 122.
For the categories of industries identified in this section, the term includes,but is not limited to, storm
water [sic] discharges from industrial plant yards; immediate access roads and rail lines used or traveled
by carriers of raw materials, manufactured products, waste material, or byproducts used or created by
the facility; material handling sites; refuse sites; sites used for the application or disposal of process
waste waters (as defined at part 401 of this chapter); sites used for the storage and maintenance of
material handling equipment; sites used for residual treatment, storage, or disposal; shipping and
receiving areas; manufacturing buildings; storage areas (including tank farms) for raw materials, and
intermediate and final products; and areas where industrial activity has taken place in the past and
significant materials remain and are exposed to storm water. For the purposes of this paragraph, material
handling activities include storage, loading and unloading, transportation, or conveyance of any raw
material, intermediate product, final product,byproduct or waste product. The term excludes areas
located on plant lands separate from the plant's industrial activities, such as office buildings and
accompanying parking lots as long as the drainage from the excluded areas is not mixed with storm
water [sic] drained from the above described areas."
Section 2. Monitoring Information and Compliance History:
• November 2016 to June 2022,benchmarks exceeded for:
o SWO03: Mercury 2x, TSS 1x, Copper Ix
(Duke Enery comments The permit in effect during this period list the Hg benchmark as NIA', with
footnote to report only and not as exceedance of benchmark with required actions.
• Per letter dated 10/25/2018, SWO03 was in Tier I status for TSS
• Per letter dated 12/6/2018, SWO03 was in Tier I status for Copper
• Per an email dated 9/3/2014, SWO03 was appropriate for ROS for SW001 and SWO02
• There are no NOVs or enforcements in BIMS for this facility; however, a slope failure occurred
at the CCR landfill in February 2022. Per a NC DEQ email from 2/4/2022, there was no
Page 4 of 13

environmental release,but ash ended up in a lined stormwater ditch. This incident was
investigated by the DEQ Division of Waste Management(DWM).
o Per Shawna Riddle (DEMLR ARO; via email 10/17/2022), The site was in compliance
during an October 2022 inspection, and no issues were found from the slope failure in
February. There are no additional concerns that need to be addressed during the permit
renewal process.
a (Duke Energy comment)All sediment and any traces of ash were cleaned from forebay
of SW011 detention pond from above event. Valves used to detain stormwater remained
closed during storm event to prevent release to environment until inspection and settling
occurred. There have been no benchmark exceedances at either SW011 or SW012 during
landfill operation and through closure.
Threatened/Endangered species:
In the area of the discharge are the Superb Jewelwing(Calopteryx amata;NC status: SR), Paddlefish
(Polyodon spathula;NC status: E), Blotched Chub (Erimystax insignis;NC status: SR), Eastern
Hellbender(Cryptobranchus alleganiensis alleganiensis;NC status: SC), Creeper(Strophitus undulatus;
NC status: T), and Sickle Darter(Percina williamsi; NC status: SC; Federal status: PT).
In the nearby vicinity of the discharge,there is the Northern Long-eared Bat(Myotis septentrionalis;NC
status: T; Federal status: PE), Mountain Sweet Pitcherplant(Sarracenia jonesii; NC status: E; Federal
status: E), Mole Salamander(Ambystoma talpoideum;NC status: SC), Bog Turtle (Glyptemys
muhlenbergii; NC status: T; Federal status: T(S/A)), Warbling Vireo (Vireo gilvus;NC status: SR), a
mayfly (Macdunnoa brunnea;NC status: SR), and Eastern Small-footed Bat (Myotis leibii; NC status:
SC).
Section 3. Proposed Monitoring for Stormwater Discharges:
The Division considered potential pollutants from past and present industrial activities (coal-fired
electric generation,plant decommissioning, and future ash removal) and data was submitted for
November 2016 to June 2022. Quantitative sampling included pH, TSS,boron, zinc, antimony, arsenic,
beryllium, cadmium, chromium, copper, lead, nickel, selenium, silver, thallium, and mercury.
Page 5 of 13

Unlike most stormwater permits in its program,the Division is proposing a permit structure with outfall-
specific monitoring for discharges. Parameters are based on potential pollutants in the drainage area,
sampling results, and in some cases, dependent upon future activities (e.g., ash removal through the
drainage area). Below is a table of the proposed monitoring for each outfall at the Asheville Steam
Electric Power Plant site.
Outfalls SW003, SWO11, and SW012
Closed and Capped Coal Combustion Residual
Landfill and haul road
Quarterly monitoring
Total Suspended Solids BASIS: Potential pollutant from drainage area and BMP effectiveness
(TSS) indicator. These outf »s may be impaeted by a eeal ash e atioH
Quarterly monitoring
BASIS: Pollutant indicator and important to interpreting toxicity potential
pH of metals. These etttf its ,be impaeted by a eeal ash e atiefl
Quarterly monitoring
Total Rainfall BASIS: Discharge potential indicator
Quarterly monitoring
Non-Polar Oil&Grease BASIS: Potential pollutant from lubricants;Method 1664 SGT-HEM
targets petroleum-based O&G. (Duke Enemy comment)If applicable due
to vehicle maintenance activi or stora e.
Quarterly monitoring
Monthly Oil Usage BASIS: Potential pollutant from drainage area. (Duke Enemy commend I
applicable due to vehicle maintenance activiU or storage.
Priority Polhitant Metals- Qttat4er-ly monitoring
A,., n Be rv,a Cr-, Cu,
be impaeted by ^ eeal ash o ,a4i (Duke EneW comment)Areas are
arm no longer subject to coal ash excavation or trans ort.
_(Duke Ener,_gy
comment Areas are no longer subject to coal ash excavation or trans ort.
Qttat4er-ly monitor-in
Duke Ener
comment Areas are no longer subject to coal ash excavation or trans ort.
(Duke Energy comment) With cappingof landfall, outfalls SWOI l and SW012 should be removed as
industrial activity is no longer present in drainage area. In addition, they are covered by NC DEQ
Erosion Control permit and Buncombe County Stormwater permit.
Outfalls SW009 and SWO10
Combined Cycle Station
Quarterly monitoring
Total Suspended Solids BASIS: Potential pollutant from drainage area and BMP effectiveness
(TSS) indicator.
Page 6 of 13

Quarterly monitoring
pH BASIS: Pollutant indicator and important to interpreting toxicity potential
of metals.
Page 7 of 13

Quarterly monitoring
Total Rainfall BASIS: Discharge potential indicator
Non Polar-Oil&Grease BASIS:CTC• Doto„t;.,1 ...,11„t.,,,t ft..,n 1„1-.,-;...,,,ts• MotI,e.l 1664 C!-`_T HEM
(Duke Energy comment)If applicable
due to vehicle maintenance activi or stora e
Monthly Oil Usage BASIS: Potential p lhA rt 4efn drainage area. Duke Eneal comment I
applicable due to vehicle maintenance activi or storage
W ,-ity Poll„tafA Metals- n,,.,,4e-ley
(Duke Energy
Ni,Pb, cl. co Tl comment)Areas were not previously subiect to coal ash excavation or
z-x ** transport and previously met 4 periods o sam lin .
Qttat4er-ly monitor-in
Boron BASIS: Coal eombustion waste (CGW) eanstituent/e0al tfaeef. (Duke
Enemy comment)Areas were not previously subiect to coal ash excavation
or transport and previously met 4 periods o sam lin .
Qttat4er-ly monitor-in
Total 14a-doers B A CTC: Monitoring f,.bar-doess dependent metals ro rya Duke Ener
comment)Areas were not previously subiect to coal ash excavation or
trans ort and previously met 4 periods o sam lin .
Quarto-l. nit
COB BASIS: D litit nt;,,,meat, (Duke Enemy comment) Chemicals are not
stored or unloading subject to stormwater.
Quar-ter-ly monitor-in
Ammonia Ni4age BASIS: Polititaiit . (Duke Energy comment) Chemicals are not
stored or unloading subject to stormwater. One outside area with
containment is being decommissioned.
**The permittee will be allowed to stop sampling for Priority Pollutant Metals and Boron at outfalls
SWO09 and SWO10 after 4 consecutive sampling events with no benchmark exceedances. (Duke Energy
commeno Areas previously met 4 periods of sampling in current permit.
Duke Energy is required to develop and perform a surface water assessment program, sampling to 2B standard
inclusive of priority metals, under the Corrective Action Program submitted to NC DEQ DWR. All surface
water sampling locations are down gradient of SWO09, SWO10, SWOH and SWO12 prior to FBR. See
attachment"01.09.23 Asheville NCDEQ Surface Water Evaluation (only sections applicable to Asheville)".
Stormwater Benchmarks and Tiered Response: Rather than limits,North Carolina NPDES
Stormwater permits contain benchmark concentrations. Stormwater benchmarks are numerical action
levels for stormwater monitoring. Benchmarks are not effluent limits, and benchmark exceedances are
not permit violations. Benchmarks provide facilities a tool for assessing the significance of pollutants in
stormwater discharges and the effectiveness of best management practices (BMPs). Benchmark
concentrations are intended as guidelines for the facility's development and implementation of the
Stormwater Pollution Prevention Plan(SWPPP).
Benchmark exceedances require the permittee to increase monitoring, increase management actions,
Page 8 of 13

increase record keeping, and/or install stormwater BMPs in a tiered program. The permit establishes a
tiered approach to specify actions the permittee must take in response to analytical results above
benchmark concentrations. The tiered structure of the permit provides the permittee and DEMLR wide
flexibility to address issues that may arise with one or more parameters and/or outfalls.
Metals benchmarks are calculated to mimic acute water quality standards and with the guidance of
DWR. NC DWR follows established federal procedures for calculating acute standards when developing
the benchmarks. Just like the acute standards, metals benchmarks normally reflect one half of the
calculated Final Acute Value (the "1/2 FAV"). In most cases, translation into total recoverable values is
based on an assumed hardness of 25 mg/L and a total suspended solids (TSS) concentration of 10 mg/L.
Acute standards protect aquatic life from negative impacts of short-term exposure to higher levels of
chemicals where the discharge enters a waterbody. The Stormwater Permitting Program applies this
approach because of the ephemeral nature of rainfall events.
The Division may evaluate results to determine if a smaller suite of parameters for some outfalls is
adequate to characterize potential pollution or BMP effectiveness. For example, one or more metals or
other parameters may serve as an adequate tracer for the presence of ash pollution during disturbance or
ash removal in specific drainage areas at this site. For parameters that do not have a stormwater
benchmark, the Division may develop a benchmark value if appropriate toxicity data become available
or if rising trends in concentrations suggest a persistent source.
A summary of the benchmarks in the draft permit, and their basis, is below:
Parameter Benchmark Basis
Antimony(Total) 340 µg/L Acute Aquatic Criterion, 1/2 FAV
Arsenic (Total) 340 µg/L Acute Aquatic Criterion, 1/2 FAV
Beryllium(Total) 65 µg/L Acute Aquatic Criterion, 1/2 FAV
Boron 34,000 µg/L CCW/Coal constituent;Narrative National Recommended
Water Quality Criterion
Cadmium(Total) 3 µg/L Acute Aquatic Criterion, 1/2 FAV
1/2 FAV; Based on (Cr III+ Cr VI) acute thresholds and
Chromium (Total) 905 µg/L assumption that industrial activities here are not a source of
hexavalent chromium
Copper(Total) 10 µg/L Acute Aquatic Criterion, 1/2 FAV
Lead(Total) 75 µg/L Acute Aquatic Criterion, 1/2 FAV
Mercury(Total) 12 ng/L CCW/Coal Constituent; Chronic 02B standard
Nickel(Total) 335 µg/L Acute Aquatic Criterion, 1/2 FAV
Selenium(Total) 5 µg/L 1/2 FAV,NC-specific,based on 1986 Study on Se impacts in
NC
Silver(Total) 0.3 µg/L Acute Aquatic Criterion, 1/2 FAV
Thallium Total 2,000 CCW/Coal constituent;Based on EPA Safe Drinking Water
( ) µg/ Act MCL
Zinc (Total) 126 µg/L Acute Aquatic Criterion, 1/2 FAV
COD 120 mg/L BPJ; Generally found at levels 4x BOD5 in domestic
wastewaters
Ammonia Nitrogen 5.6 mg/L Based on the mussels-present/trout absent acute criteria table
Summer in the 2013 EPA criteria document
Ammonia Nitrogen 15 mg/L Based on the mussels-present/trout absent acute criteria table
Winter in the 2013 EPA criteria document
Page 9 of 13

Total Suspended 100 mg/L National Urban Runoff Program(NURP) Study, 1983
Solids (TSS)
pH 6 s.u. —9 s.u. NC Water Quality Standard(Range)
Non-Polar Oil& Review of other state's daily maximum benchmark
Grease, EPA 15 m concentration for this more targeted O&G;NC WQS that
Method 1664 does not allow oil sheen in waters
SGT-HEM
Page 10 of 13

Stormwater Pollution Prevention Plan: The proposed permit conditions reflect the EPA and NC's
pollution prevention approach to stormwater permitting. The Division's maintains that implementation
of Best Management Practices (BMPs) and traditional stormwater management practices that control the
source of pollutants meets the definition of Best Available Technology (BAT) and Best Conventional
Pollutant Control Technology(BCT). The permit conditions are not numeric effluent limitations but are
designed to be flexible requirements for implementing site-specific plans to minimize and control
pollutants in stormwater discharges associated with the industrial activity. Title 40 Code of Federal
Regulations (CFR) §122.44(k)(2) authorizes the use of BMPs in lieu of numeric effluent limitations in
NPDES permits when the agency finds numeric effluent limitations to be infeasible. The agency may
also impose BMP requirements which are "reasonably necessary" to carry out the purposes of the Act
under the authority of 40 CFR 122.44(k)(3). The conditions proposed in this draft permit are included
under the authority of both of these regulatory provisions. In essence, the pollution prevention and BMP
requirements operate as limitations on effluent discharges that reflect the application of BAT/BCT.
Mercury Monitoring Requirements: The proposed permit requires mercury to be measured in
stormwater samples by EPA Method 1631E,which can detect levels as low as 0.5 ng/l. This requirement
is consistent with recent federal rule-making that requires NPDES permittees to monitor discharges with
sufficiently sensitive test procedures approved under 40 CFR §136. Modifications to 40 CFR §122.44(i)
require a method that has a minimum level (ML) at or below the effluent limit (not applicable here), or
the lowest minimum level(ML) of EPA approved analytical methods for the measured parameter. Based
on results, Method 1631E will be required to quantify levels in these discharges. NC DEMLR
understands that this method is more costly and requires a more intensive sampling protocol than most
other parameters, and that fish tissue sampling will be provided during the permit cycle. Therefore, no
benchmark applies that would trigger tiered response actions. Proposed permit provisions also allow the
permittee to use field blank and/or method blank concentrations to adjust reported mercury levels as
long as documented is submitted with the Data Monitoring Report DMR).
Flexibility in Tier Responses: Tier Two actions provide an opportunity for the permittee to propose an
alternative monitoring plan for approval by the Region:
• Alternatively, in lieu of steps 2 and 3, the permittee may, after two consecutive exceedances,
exercise the option of contacting the DEMLR Regional Engineer as provided below in Tier
Three. The Regional Engineer may direct the response actions on the part of the permittee as
provided in Tier Three, including reduced or additional sampling parameters or frequency.
• If pursuing the alternative above after two consecutive exceedances,the permittee may propose
an alternative monitoring plan for approval by the Regional Engineer.
The permit therefore allows the permittee to petition the Regional Office for monitoring changes sooner
than Tier Three (upon any four benchmark exceedances) and gives guidance on one option to take. For
example, the permittee may request that mercury only be monitored semi-annually under the tiers, or
that only parameters over the benchmark be monitored more frequently. In this way, changes to the
monitoring scheme for any outfall could be handled outside of a permit modification.
Other Proposed Requirements:
• It is standard for Stormwater Pollution Prevention Plan(SWPPP)requirements to include an
annual certification that stormwater outfalls have been evaluated for the presence of non-
stormwater discharges, and if any are identified, how those discharges are permitted or otherwise
authorized.
Page 11 of 13

• Requirement to submit a request for permit modification if the facility identifies or creates any
new outfalls,removes outfalls, or alters any drainage area that changes potential pollutants. This
site may trigger this requirement during demolition or ash removal activities.
• The Division expects the permittee to apply best professional judgment and consider the safety
of its personnel in fulfilling sampling obligations under the permit.
• Federal regulations require electronic submittal of all discharge monitoring reports (DMRs). If a
state does not establish a system to receive such submittals, then permittees must submit DMRs
electronically to the EPA.
• Quarterly QualitativeNisual Monitoring to assure regular observation of outfalls throughout
year.
Section 4. Changes from previous permit to draft:
• Monitoring increased from semi-annually to quarterly for all parameters and outfalls (qualitative
and quantitative)
• "No discharge" clarifications made
• eDMR requirement added
• Boilerplate language moved into body of the permit; boilerplate no longer attached
• Facility address updated on permit cover sheet
• Non-polar oil and grease added to all outfalls per current permitting guidance
• Monthly Oil Usage added to all outfalls per current permitting guidance
• Monitoring for total hardness added for all outfalls as monitoring for hardness dependent metals
is required
• Benchmarks updated for parameters per guidance from DWR Standards group on stormwater
benchmarks
• Outfall SW001 as it no longer discharges industrial stormwater(per renewal application)
• Outfalls SW007 and SW008 removed from the permit as the road will no longer be built(per
renewal application)
• Outfall SW013 removed from the permit as the outfalI will no longer be built(per renewal
application)
• Ammonia nitrogen added to outfalls SW009 and SWO10 due to presence of aqueous ammonia in
drainage area
• COD added to outfalls SW009 and SWO10 due to presence of water treatment chemicals
Section 5. Changes from draft to final:
Section 6.Discussions with the Facility and Regional Office:
• Initial contact with facility: 6/27/2022
• Initial contact with Regional Office: 6/27/2022
• Draft sent to CO peer review: 12/14/2022
• Draft sent to Regional Office: 1/24/2023
• Final permit sent for supervisor signature:
Page 12 of 13

Section 7. Comments received on draft permit:
Page 13 of 43

NCS000575 Draft permit w/tracked comments

di STATE o„A'
ROY COOPER .A
Governor d
ELIZABETH S.BISER
Secretary
DOUGLAS R.ANSEL NORTH CAROLINA
Interim Director Environmental Quality
January 26,2023
Jessica Bednarcik, Senior Vice President
Duke Energy Progress, LLC
526 S Church Street
Charlotte,NC 28201
Subject: Draft NPDES Stormwater Permit
NPDES Permit NCS000575
Asheville Steam Electric Power Plant
Buncombe County
Dear Permittee:
The Division of Energy, Mineral, and Land Resources (DEMLR) Stormwater Permitting
Program acknowledges receipt of your renewal application for coverage under NPDES Permit
NCS000575 on November 4, 2020. Enclosed with this letter is a copy of the draft stormwater
permit for your facility. Please review the draft carefully to ensure thorough understanding of the
conditions and requirements it contains.
The draft permit contains the following significant changes from the current permit:
1. Monitoring increased from semi-annually to quarterly for all parameters (qualitative and
quantitative).
2. Units of measure for several benchmarks have been changed from mg/L to µg/L.
3. "No discharge"clarifications were made.
4. eDMR reporting requirement was added.
5. Boilerplate language has been moved into the body of the permit. There is no longer a
boilerplate attachment to the permit.
6. Total hardness monitoring added for all outfalls that also require monitoring for hardness
dependent metals.
7. Non-polar Oil& Grease and Monthly Oil Usage have been added to all outfalls per
current stormwater permitting guidance.
8. Monitoring for total hardness added for all outfalls as monitoring for hardness dependent
metals is required.
9. Outfalls SW001, SW007, SW008, and SW013 have been removed per information
provided in the permit renewal application.
D E Q�� North Carolina Department of Environmental Quality I Division of Energy,Mineral and Land Resources
512 North Salisbury Street 1 1612 Mail Service Center I Raleigh,North Carolina 27699-1612
NORTH CAROLINA _
oan.emant of Enmmmmmi ownry 919.707.9200

10. Ammonia nitrogen and COD added for outfalls SW009 and SWO10 as aqueous ammonia
and water treatment chemicals are present in the drainage areas.
11. Changes have been made to monitoring parameters and benchmarks. Stormwater
benchmarks are not permit limits,but rather guidelines for implementing the Stormwater
Pollution Prevention Plan(SWPPP). A benchmark exceedance is not a permit violation;
however, the permittee must respond to exceedances as directed in the Tiers.
Threatened and Endangered Species: Please note that your facility drains to an area where there
are threatened and endangered species. The Superb Jewelwing (Calopteryx amata), Paddlefish
(Polyodon spathula), Blotched Chub (Erimystax insignis), Eastern Hellbender(Cryptobranchus
alleganiensis alleganiensis), Creeper(Strophitus undulatus), and Sickle Darter(Percina
williamsi) are species of concern that have been identified near your facility. Failure to abide by
your stormwater permit may constitute violation of the Threatened and Endangered Species Act.
With this notification,the Division will solicit public comment on this draft permit by publishing
a notice in newspapers having circulation in the general Buncombe County area, per EPA
requirements. Please provide your comments, if any, to me no later than 30 days after
receiving this draft permit. Comments may be emailed to [e-mail] or
mailed to:
NC DEMLR
Stormwater Permitting Program
Attn: Brianna Young
1612 Mail Service Center
Raleigh,NC 27699-1612
Following the 30-day public comment period, the Division will review all pertinent comments
and take appropriate action prior to issuing a final permit. If you have questions concerning the
draft, please contact me at [e-mail] or call 919-707-3647.
Sincerely,
Brianna Young,Environ ental Program Consultant
DEMLR Stormwater Program
Attachment: Draft Permit NCS000575
cc:NPDES Stormwater Program Files(Laserfiche)
Asheville Regional Office
Don Safrit,Lead Environmental Specialist,Duke Energy Progress
Teresa Williams,Lead Environmental Field Specialist,Duke Energy Progress
WSS/Aquatic Toxicology Branch
USFWS
NCWRC
NoahCihrallna Departn"i of EovIr rYm"Ral Quaky I Divigon 4fnergy.Nfineral and LoW Reeourcra
1E 312 North Salisbury Street 11612 Mai Ser zeCentcr I Ralefgk North QrallnaZ7699-1612
919,707.9360

Permit NCS000575
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF ENERGY, MINERAL, AND LAND RESOURCES
PERMIT
TO DISCHARGE STORMWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
(NPDES)
In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended,
Duke Energy Progress, LLC
is hereby authorized to discharge stormwater from a facility located at:
Asheville Steam Electric Power Plant
46 Duke Energy Lane
Arden, NC
Buncombe County
to receiving waters designated as Powell Creek(Lake Julian), a Class C stream, and an unnamed
tributary to the French Broad River, a Class B stream, in the French Broad River Basin, in accordance
with the discharge limitations, monitoring requirements, and other conditions set forth in Parts A
through J hereof.
This permit shall become effective
This permit and the authorization to discharge shall expire at midnight on , 2028.
Signed this day
for Douglas R. Ansel, Interim Director
Division of Energy, Mineral and Land Resources
By the Authority of the Environmental Management Commission
Page 1 of 40

Permit NCS000575
TABLE OF CONTENTS
PART A: INDIVIDUAL PERMIT COVERAGE
PART B: STORMWATER POLLUTION PREVENTION PLAN(SWPPP)
B-1. Responsible Party
B-2. General Location Map
B-3. Site Map
B-4. Narrative Description of Industrial Processes
B-5. Evaluation of Stormwater Outfalls
B-6. Narrative Description of Stormwater SCMs/BMPs
B-7. Facility Inspections
B-8. Feasibility Study
B-9. Secondary Containment Plan
B-10. Spill Prevention and Response Procedures
B-11. Preventative Maintenance and Good Housekeeping Program
B-12. Employee Training
B-13. Representative Outfall Status
B-14. Annual SWPPP Review and Update
B-15. Annual On-Line SWPPP Certification when Available
B-16. Notice to Modify SWPPP
B-17. SWPPP Documentation
PART C: QUALITATIVE MONITORING OF STORMWATER DISCHARGES
C-1. Visual Inspections
C-2. Qualitative Monitoring Response
PART D: ANALYTICAL MONITORING REQUIREMENTS
D-1. Required Baseline Sampling
D-2. Baseline Sampling Benchmarks
D-3. Methodology for Collecting Samples
D-4. Locations for Collecting Samples
D-5. Tier One Response: Single Benchmark Exceedance
D-6. Tier Two Response: Two Consecutive Benchmark Exceedances
D-7. Tier Three Response: Four Benchmark Exceedances Within 5 Years
PART E: SUBMITTAL OF DISCHARGE MONITORING REPORTS (DMRs)
E-1. Deadlines for Submittal of Discharge Monitoring Reports
E-2. Submittal Process after Electronic Discharge Monitoring Reporting(eDMR)
E-3. Results Below Detection Limits
E-4. Occurrences of No Discharge
E-5. Reports if More Frequent Monitoring Has Occurred
E-6. Report if Begin Discharging to a New Stormwater Discharge Outfall
E-7. Qualitative Monitoring Reports
E-8. Monitoring Report Retention
E-9. Waivers from Electronic Reporting
PART F: OTHER OCCURENCES THAT MUST BE REPORTED
Page 2 of 40

Permit NCS000575
PART G: PERMIT ADMINISTRATION
G-1. Signatory Requirements
G-2. Permit Expiration
G-3. Planned Changes
G-4. Transfers
G-5. Sale or Closure
G-6. Permit Modification,Revocation and Reissuance, or Termination
G-7. Anticipated Noncompliance
G-8. Requirement to Report Incorrect Information
G-9. Annual Administering and Compliance Monitoring Fee Requirements
G-10. Flow Measurements
G-11. Test Procedures
G-12. Representative Outfall
G-13. Availability of Reports
G-14. Permit Actions
G-15. Recording Results
PART H: OPERATION AND MAINTENANCE of POLLUTION CONTROLS
H-1. Proper Operation and Maintenance
H-2. Corrective Actions
H-3. Draw Down of Treatment Facilities for Essential Maintenance
H-4. Bypasses of Stormwater Control Facilities
H-5. Upsets
H-6. Required Notice for Bypass or Upset
PART I: COMPLIANCE AND LIABILITY
I-1. Compliance Schedule
I-2. Duty to Comply
I-3. Duty to Mitigate
I-4. Civil and Criminal Liability
I-5. Oil and Hazardous Substance Liability
I-6. Property Rights
I-7. Severability
I-8. Duty to Provide Information
I-9. Penalties for Tampering
I-10. Penalties for Falsification of Reports
I-11. Onshore or Offshore Construction
I-12. Duty to Reapply
I-13. Inspection and Entry
I-14. Need to Halt or Reduce Not a Defense
PART J: DEFINITIONS
Page 3 of 40

Permit NCS000575
PART A: INDIVIDUAL PERMIT COVERAGE
During the period beginning on the effective date of the permit and lasting until expiration,the permittee
is authorized to discharge stormwater associated with industrial activity. Such discharges shall be
controlled, limited and monitored as specified in this permit.
If industrial materials and activities are not exposed to precipitation or runoff as described in 40 CFR
§122.26(g),the facility may qualify for a No Exposure Certification from NPDES stormwater discharge
permit requirements. Any owner or operator wishing to obtain a No Exposure Certification must:
(a) Submit a No Exposure Certification application form to the Division of Energy, Mineral and
Land Resources (Division),
(b) Receive approval from the Division,
(c) Maintain no exposure conditions unless authorized to discharge under a valid NPDES
stormwater permit, and
(d) Recertify the No Exposure Certification annually.
Until this permit expires or is modified or revoked, the permittee is authorized to discharge stormwater
to the surface waters of North Carolina or separate storm sewer system that has been adequately treated
and managed in accordance with the terms and conditions of this permit.
Any other point source discharge to surface waters of the state is prohibited unless it is an allowable
non-stormwater discharge or is covered by another permit, authorization, or approval. The stormwater
discharges allowed by this permit shall not cause or contribute to violations of Water Quality Standards.
This permit does not relieve the permittee from responsibility for compliance with any other applicable
federal, state, or local law,rule, standard, ordinance, order,judgment, or decree.
Page 4 of 40

Permit NCS000575
PART B: STORMWATER POLLUTION PREVENTION PLAN (SWPPP)
The permittee shall develop and implement a Stormwater Pollution Prevention Plan (SWPPP). The
SWPPP shall be maintained on site unless exempted from this requirement by the Division. The
permittee shall implement the SWPPP and all Best Management Practices (BMPs) consistent with the
provisions of this permit,to control contaminants entering surface waters. These items shall exist for the
duration of the permit term and be made available to the Director upon request, and shall also be sent to
the Asheville Regional Office upon request. The SWPPP shall be considered public information in
accordance with Part G-13 of this Individual Permit.
The SWPPP shall include, at a minimum,the following items:
B-1. Responsible Party
The SWPPP shall identify(a) specific position(s)responsible for the overall coordination, development,
implementation, and revision of the SWPPP. Responsibilities for all components of the SWPPP shall be
documented and position assignments provided.
B-2. General Location May
The General Location Map shall be a USGS quadrangle map or appropriately drafted equivalent map
that includes:
(a) The facility's location in relation to transportation routes and surface waters;
(b) The name of the receiving waters to which the stormwater outfalls discharge, or if the discharge is
to a Municipal Separate Storm Sewer System(MS4), the name of the municipality and the
ultimate receiving waters; and
(c) Any receiving waters that exceed criteria for one or more parameters or if the site is located in a
watershed for which a Total Maximum Daily Load(TMDL)has been established and, if so, a list
of the parameter(s) of concern.
B-3. Site Map
The Site Map shall include the following at a scale sufficient to clearly depict all required features. At a
minimum, the map shall include:
(a) Site property/permit boundary;
(b) Site topography and finished grade;
(c) Buildings,roads, parking areas and other built-upon areas;
(d) Industrial activity areas (including: fueling,vehicle maintenance and repair, washing of materials
or equipment, storage of materials, disposal areas,process areas, loading and unloading areas, and
haul roads);
(e) A table of stormwater discharge outfalls and their latitudes and longitudes;
(f) Drainage area for each outfall with an estimation of impervious area percentage;
(g) Stormwater Control Measures (SCMs);
(h) All stormwater collection/drainage features, structures and direction of flow;
(i) On-site and adjacent surface waters and wetlands; and
(j) A graphic scale and north arrow.
Page 5 of 40

Permit NCS000575
Location Map:
r Y�Fli}'��f�i} • a -1
�� ff�l rf;+rr �'. .' � �/+ N .r • � li ■� } i� � ■ .r
• , `
r� ■ t
OA
Ip
�� _ � ,,r. � � �,.� i — rya + t a� ' ■ �t
1■ . �i.r 1J + J. ■
r
` 7 i
�
Site Hur�
�� � r r •
Substa
7
-
- , G• pier � s
Ik
i ■
Latitude: 35' 27' 56" N
Longitude: 82' 33' 01"W
County: Buncombe
Approximate Facility
Receiving Stream: Powell Creek(Lake Julian) Location
and UT to French Broad River cffoalk NCS000575
Stream Class: C and B (respectively)
Asheville Steam Electric
Sub-basin: 04-03-02 (French Broad River Basin) Power Plant
Page 6 of 40

Permit NCS000575
B-4. Narrative Description of Industrial Processes
The narrative description shall include:
(a) Storage practices;
(b) Loading and unloading activities;
(c) Outdoor process areas;
(d) Dust or particulate generating and control processes;
(e) Waste disposal practices; and
(f) A list of the potential pollutants that could be expected to be present in the stormwater discharge
from each outfall.
B-5. Evaluation of Stormwater Outfalls
On an annual basis, the permittee shall evaluate all stormwater outfalls for the presence of non-
stormwater discharges. If non-stormwater discharges are present, the permittee shall identify the source
and record whether the discharge is otherwise permitted by rule or a different permit. The permittee
shall evaluate the environmental significance of the non-stormwater discharges and include a summary
written record and certification statement. The certification statement and summary written record shall
be retained with the SWPPP and shall be dated and signed in accordance with the requirements found in
Part G=1 of this permit.
B-6. Narrative Description of Stormwater SCMs/BMPs
A narrative description of structural Stormwater Control Measures (SCMs) and non-structural Best
Management Practices(BMPs)on site shall be provided. Appropriate SCMs/BMPs may include,but are
not limited to, vegetative swales, berms, and reuse of collected stormwater(such as for an industrial
process or as an irrigation source) in a manner that reduces pollutants in stormwater discharges leaving
the site. The installation and implementation of SCMs/BMPs shall be based on the assessment of the
potential for sources to contribute significant quantities of pollutants to stormwater discharges and on
data collected through monitoring of stormwater discharges. The Narrative Description of SCMs/BMPs
shall be reviewed and updated annually.
The narrative description of stormwater SCMs/BMPs shall include:
(a) A written record of the specific rationale for installation and implementation of the selected site
SCMs and/or BMPs; and
(b) BMPs for vehicle maintenance activities.
B-7. Facility Inspections
Inspections of the facility and all stormwater systems shall occur as part of the Preventative
Maintenance and Good Housekeeping Program at a minimum on a quarterly schedule, with at least 30
days separating inspection dates (unless performed more frequently than quarterly). These facility
inspections are different from, and in addition to, the stormwater discharge characteristic monitoring at
the outfalls required in Parts C and D of this permit.
B-8. Feasibility Study
The feasibility study shall include a review of the technical and economic feasibility of changing the
methods of operations and/or storage practices to eliminate or reduce exposure of materials and
Page 7 of 40

Permit NCS000575
processes to rainfall and run-on flows. Wherever practical,the permittee shall prevent exposure of all
storage areas, material handling operations, and manufacturing or fueling operations. In areas where
elimination of exposure is not practical, this review shall document the feasibility of diverting the
stormwater run-on away from areas of potential contamination.
B-9. Secondary Containment Plan
In order to prevent leaks and spills from contaminating stormwater runoff, secondary containment is
required for: bulk storage of liquid materials including petroleum products; storage in any amount of
water priority chemicals listed in Section 313 of Title III of the Superfund Amendments and
Reauthorization Act(SARA); and storage of hazardous substances in any amount.
For facilities subject to the federal Spill Prevention, Control, and Countermeasure (SPCC)regulation,
the SPCC Plan may be used to support compliance with this requirement.
The Secondary Containment Plan shall include:
(a) A table or summary of tanks and stored materials equipped with secondary containment systems;
(b) Manually activated valves or other similar devices that are securely closed with a locking
mechanism if the secondary containment devices are connected to stormwater conveyance system;
(c) A commitment to visually observe any accumulated stormwater prior to release for color, foam,
outfall staining,visible sheens, and dry weather flow. Accumulated stormwater may be released if
found to be uncontaminated by any material. Accumulated stormwater found to be contaminated
shall not be released from the containment area;
(d) Records on every release from a secondary containment system that include: the individual
making the observation, a description of the accumulated stormwater, and the date and time of the
release. These records shall be kept for a period of five (5) years.
B-10. Spill Prevention and Response Procedures
A responsible person shall be on-site at all times during facility operations that have potential to
contaminate stormwater runoff through spills or exposure of materials associated with the facility
operations. For facilities subject to the federal Spill Control and Countermeasure (SPCC)regulation, the
SPCC Plan may be used to support compliance with this permit. The Spill Prevention and Response
Procedures (SPRP) shall incorporate an assessment of potential pollutant sources based on a materials
inventory of the facility. The SPRP must be site specific. An oil SPCC Plan may be a component of the
SPRP. The common elements of the SPCC used to meet the SPRP shall be incorporated by reference
into the SPRP.
The Spill Prevention and Response Procedures (SPRP) shall include at minimum:
(a) An assessment of areas of the facility where there is the potential for spills;
(b) A list of trained facility personnel responsible for implementing the SPRP;
(c) A signed and dated acknowledgement in which staff members accept responsibilities for the
SPRP;
(d) A supply of spill response materials and equipment and the locations for storing these items;
(e) Written procedures for proper cleanup and disposal of spilled materials; and
(f) A list of significant spills or leaks of pollutants that have occurred during the previous three (3)
Page 8 of 40

Permit NCS000575
years and any corrective actions taken to mitigate spill impacts or the notation that no spills have
occurred. This list shall be updated on annual basis.
B-11. Preventative Maintenance and Good Housekeeping Program
A preventative maintenance and good housekeeping program(PMGHP) shall be developed and
implemented. The program shall address all stormwater control measures (SCMs) (if applicable),
stormwater discharge outfalls, all on-site and adjacent surface waters and wetlands, industrial activity
areas (including material storage areas, material handling areas, disposal areas, process areas, loading
and unloading areas, and haul roads), all drainage features and structures, and existing structural SCMs
and non-structural BMPs.
The PMGHP shall include:
(a) A schedule of inspections, maintenance and housekeeping measures for industrial activity areas
including, at a minimum, all material storage and handling areas, disposal areas,process areas,
loading and unloading areas, haul roads, and vehicle maintenance areas. Inspections shall occur at
a minimum on a quarterly schedule. A minimum of thirty (30) days must separate each
inspection LDuke EneW sysuggested langyy e) unless performed more frequently):
i. Period 1: January 1 —March 31
ii. Period 2: April 1 —June 30
iii. Period 3: July 1 —September 30
iv. Period 4: October 1 —December 31
(b) A plan for disposing spent lubricants and fuels properly and in accordance with applicable federal
disposal regulations (if applicable); and
(c) A record of inspections, maintenance, and housekeeping activities.
B-12. Employee Training
Training programs shall be provided at a minimum on an annual basis for facility personnel with
responsibilities for: spill response and cleanup,preventative maintenance activities, and for any of the
facility's operations that have the potential to contaminate stormwater runoff. The facility personnel
responsible for implementing the training shall be identified, and their annual training shall be
documented by the signature of each employee trained.
The annual employee training shall include, at a minimum, the following topics:
(a) General stormwater awareness;
(b) Spill response and cleanup procedures;
(c) Preventative maintenance and good housekeeping activities;
(d) Secondary containment releases; and
(e) Fueling procedures (if applicable).
B-13. Representative Outfall Status
If the Division has granted representative outfall status (ROS), written documentation from the Division
shall be part of the SWPPP. The permittee shall notify the Division of any site or activity modifications
that result in a change to ROS.
Page 9 of 40

Permit NCS000575
B-14. Annual SWPPP Review and Update
All aspects of the SWPPP shall be reviewed and updated on an annual basis. The permittee shall amend
the SWPPP whenever there is a change in design, construction, operation, site drainage, maintenance, or
configuration of the physical features which may have a significant effect on the potential for the
discharge of pollutants to surface waters.
In addition to the other items in Part B of the permit, the SWPPP update shall include:
(a) An updated list of significant spills or leaks of pollutants for the previous three (3)years, or the
notation that no spills have occurred;
(b) A written certification that the stormwater outfalls have been evaluated for the presence of non-
stormwater discharges;
(c) A documented re-evaluation of the effectiveness of the on-site SCMs and BMPs in minimizing
the contamination of stormwater runoff, including a summarization of all SCM inspections
conducted throughout the year preceding the annual update;
(d) A statement that annual training requirements were met in the past year; and
(e) A review and comparison of sample analytical data to benchmark values (if applicable) over the
past year, including an evaluation of Tiered Response status.
B-15. Annual On-Line SWPPP Certification when Available
After the Division's ePermitting system develops the capability to receive this information, an online
certification that the SWPPP annual update has been completed in a manner that meets the conditions of
this permit shall be submitted annually.
B-16. Notice to Modify SWPPP
The Director may notify the permittee when the SWPPP does not meet one or more of the minimum
requirements of the permit. Within 30 days of such notice, the permittee shall submit a time schedule to
the Director for modifying the SWPPP to meet minimum requirements. The permittee shall provide
certification in writing (in accordance with Part G=1 of this permit)to the Director that the changes have
been made.
B-17. SWPPP Documentation
Documentation of all monitoring, measurements, inspections, maintenance activities, and training
provided to employees, including the log of the sampling data and of actions taken to implement SCMs
and BMPs associated with the industrial activities, including vehicle maintenance activities. Such
documentation shall be kept on-site for a period of five (5)years and made available to the Division
immediately upon request.
Page 10 of 40

Permit NCS000575
PART C: QUALITATIVE MONITORING OF STORMWATER DISCHARGES
The purpose of qualitative monitoring is to implement a quick and inexpensive way to evaluate
the effectiveness of the permittee's SWPPP, to identify the potential for new sources of
stormwater pollution, and to prompt the permittee's response to pollution.
C-1. Visual Inspections
(a) Visual inspections shall be made at each stormwater discharge outfall (SDQ)that
discharges stormwater associated with industrial activity unless representative outfall
status specifically for visual monitoring has been approved in writing by the Division.
(b) Visual inspections shall be performed concurrent with required analytical monitoring
on a quarterly basis.Note: These monitoring requirements will increase to a monthly
basis when responding to Tier Two status.
(c) Visual inspections are not required to be performed outside of the facility's normal
operating hours.
(d) Visual inspections shall be recorded on the Division's Stormwater Discharge Outfall
Qualitative Monitoring Report (QMR) form and shall include observations of:
i. Color;
ii. Odor;
iii. Clarity;
iv. Floating Solids;
V. Suspended Solids;
vi. Foam;
vii. Oil Sheen;
viii. Deposition at or immediately below the outfall;
ix. Erosion at or immediately below the outfall; and
X. Other obvious indicators of stormwater pollution.
(e) Inability to perform inspections because of adverse weather or lack of discharge during
the monitoring period shall not constitute a failure to monitor if the event is documented
in the SWPPP and recorded on the Qualitative Monitoring Report.
C-2. Qualitative Monitoring Response
(a) If the permittee's qualitative monitoring indicates that the SWPPP and/or existing
stormwater BMPs are ineffective, or that significant stormwater contamination is present,
then the permittee shall investigate potential causes, evaluate the feasibility of corrective
actions, and implement those feasible corrective actions within sixty(60) days.
(b) A written record of the permittee's investigation, evaluation, and response actions shall be
kept in the SWPPP.
Page 11 of 40

Permit NCS000575
PART D: ANALYTICAL MONITORING REQUIREMENTS
This part applies to industrial stormwater discharges of stormwater-only flows from drainage
areas where industrial activities are performed.
D-1. Required Baseline Sampling
The permittee shall perform baseline sampling of all stormwater discharge outfalls
and/or authorized representative discharge outfalls in accordance with this part.
(a) Grab samples shall be collected, analyzed, and reported for all the parameters listed in
Table 1 and Table 2 below, except for Total Rainfall which shall be monitored using a
rain gauge.
(b) In addition to the grab samples, the average monthly usage of new motor and hydraulic oil
for the facility shall be tracked, recorded, and reported to the Division if it exceeds an
average of 55 gallons per month.
(c) The total rainfall amount for each sampling event shall be recorded in inches. Total
rainfall shall be determined from an on-site rain gauge or a regional rain gauge located
within one (1) mile of the facility.
(d) Samples shall be collected from four separate monitoring periods per year, unless the
facility is in Tier Two or Tier Three status. A minimum of thirty(30) days must separate
any two sampling events during the following periods:
i. Period 1: January 1 —March 31
ii. Period 2: April 1 —June 30
iii. Period 3: July 1 —September 30
iv. Period 4: October 1 —December 31
(e) If the facility was in Tier Two or Tier Three status under the previous permit,the facility
shall continue monthly monitoring and reporting requirements until relieved by the
provisions of this permit or the Division.
D-2. Baseline Sampling Benchmarks
(a) Analytical results for each parameter shall be compared to the benchmark values for the
appropriate receiving stream classification as provided in Table 1 and Table 2. An
exceedance of a benchmark value is not a permit violation; however, failure to respond in
accordance with part D-2 b of this permit is a permit violation.
(b) An exceedance of any benchmark value in Table 1 and Table 2 shall require a tiered
response for that parameter. A single exceedance of a benchmark value shall require a
Tier One response for that parameter. Two benchmark value exceedances in a row shall
require a Tier Two response for that parameter. Four benchmark exceedances for a
parameter within a five (5)year period shall require a Tier Three response for that
parameter.
(c) Baseline sampling benchmarks shall be in accordance with Table 1 and Table 2 below.
Page 12 of 40

Permit NCS000575
Table 1. Summary of Quarterly Baseline Sampling Requirements for Stormwater
Discharges for Outfalls SW003, SWO11, and SW012
Parameter Code for Parameter Frequency' Benchmark
Reporting
CO530 Total Suspended Solids(TSS) Quarterly 100 mg/L
00400 pH 2 Quarterly 6 s.u.—9 s.u.
46529 Total Rainfall of Sampled Event -
(inches)3
Non-Polar Oil&Grease for drainage
00552 areas that use>55 gallons/month of Quarterly 15 mg/L
oil on average per EPA Method 1664
(SGT-HEM)(syggested language-"if
applicable"
NCOIL Estimated Average Monthly Oil -
Usage at the Facility
(gallons)-
su ested language-"if a licable"
n i22 Bare Qtiat4er4j, 2 4,000 t o—r �r
7 09 ��.4imo
W 002 Arsenie Quarterly 340 tig!
nib Befylliu Quafte
nib ran Qua�ey
01042 GE)Ppe Quafter-4J TO tt
01051 Lead (Nafterly L
COME Mew Quarterly 12 ItpL
01067 Tsdiclfel Quat4edy 335 ttg
01147 Can Quarte
01077 silve Quaftedy n
01059 Thalli Qtffted 2,00
W 09-2 tine Quarterly 126 jig
iz sss Totarli--c"�,s_,--[GaCO3of(C�
98989 *,r_\,3 Quarterly -
Page 13 of 40

Permit NCS000575
Footnotes:
1. Measurement frequency: Quarterly during a measurable storm event. If the facility is monitoring
monthly due to Tier Two or Tier Three response actions,the facility shall continue a monthly
monitoring and reporting schedule in Tier Two or Tier Three status until relief is granted.
2. If pH values outside this range are recorded in sampled stormwater discharges,but ambient
precipitation pH levels are lower,then the lower threshold of this benchmark range is the pH of
the precipitation(within instrument accuracy)instead of 6 s.u..Readings from an on-site or local
rain gauge (or local precipitation data)must be documented to demonstrate background
concentrations were below the benchmark pH range.
3. For each sampled measurable storm event, the total precipitation must be recorded. An on-site
rain gauge is required.Where isolated sites are unmanned for extended periods of time, a local
rain gauge reading may be substitute for an on-site reading.
4. Tao,-..ury shall be,.,o.,sure,l by FDA Method 1 631 E.
5. Hardness sampling should be per-formed in eor��etion with testing for hardness dependen
metals(er'k4l iiirirE6ppE'r lead,, rniekel,, si!N er and zinc+
• Outfall SW003: Drainage area consists of the station back haul
road area from public road to guard house. No storagey fuels, chemicals or
materials. ( ,
liqttid-
storage tanks, and switehyards).
• Outfall SWO11: Drainage area consists of the capped and closed CCR landfill area and
receive discharge from the turf cover and maintenance access roads and eeal ash hate
• Outfall SW012: Drainage area consists of the CCR landfill area and receive discharge
from the turf cover and maintenance access roads and eeal ash haul recta
♦ (Duke Energy) Request removal of SWO11 and SW012 as they are no longer
subiect to industrial activity and covered by NC DEO Erosion Control permit and
Buncombe County Stormwater permit.
Page 14 of 40

Permit NCS000575
Table 2. Summary of Quarterly Baseline Sampling Requirements for Stormwater
Discharges for Outfalls SWO09 and SWO10
Parameter Code for Parameter Frequency' Benchmark
Reporting
C0530 Total Suspended Solids(TSS) Quarterly 100 mg/L
00400 pH 2 Quarterly 6 s.u.—9 s.u.
46529 Total Rainfall of Sampled Event - -
(inches)3
Non-Polar Oil&Grease for drainage
00552 areas that use>55 gallons/month of Quarterly 15 mg/L
oil on average per EPA Method 1664
(SGT-HEM)(syggested language-"if
applicable"
NCOIL Estimated Average Monthly Oil -
Usage at the Facility
(gallons)-
su ested language-"if a licable"
C;06 10 * Quaftedy 15 mgiL
01022 ger&H_4 @"arter3 3 4,000 jig
01097 Antimony4 @uarte 3 4 0 pgLL L
0�2 Arsenic Q� 340 PA/L
0101-2 Befyllitim4 Quaftefly
nib C-Admillm-r4
n i� Chromium
01042 Copper 4 @ea#erly 49 ttg
W051 Lead_4 QuaAe 75 tt
COMER Me 3`43 Quarterly
01067 Niekel Qua#edy 335 jig
01147 Seleniffm4 QuaAe p_G , i—
� 9� �_
0
4 Quarterly tiger F��T
W 05-9 Thal1itim Qttaf ter4j 2,000 tt�
ni92 ziffe-:4 Qwi4e 126 jig
Page 15 of 40

Permit NCS000575
00900 Hardness Total as[GaGO3 e Quarter!
W
*W4wer:November-1 N4afeh 31
Footnotes:
1. Measurement frequency: Quarterly during a measurable storm event. If the facility is monitoring
monthly due to Tier Two or Tier Three response actions,the facility shall continue a monthly
monitoring and reporting schedule in Tier Two or Tier Three status until relief is granted.
2. If pH values outside this range are recorded in sampled stormwater discharges,but ambient
precipitation pH levels are lower,then the lower threshold of this benchmark range is the pH of
the precipitation(within instrument accuracy)instead of 6 s.u..Readings from an on-site or local
rain gauge (or local precipitation data)must be documented to demonstrate background
concentrations were below the benchmark pH range.
3. For each sampled measurable storm event, the total precipitation must be recorded. An on-site
rain gauge is required.Where isolated sites are unmanned for extended periods of time, a local
rain gauge reading may be substitute for an on-site reading.
4. The pefmi4ee will be allowed to stop sampling for-Wiet4tt,Palltttat4 Metals and Befen a+etitfalls-
Duke
Energy) See notes in fact sheet comments.
6. 14ar-dness sampling should be peffofmed in eof��etionv�,ith testing f6f hardness dependen
metals (et'td lead, niekel, silver, and ziffe+
• Outfall SWO09: Drainage area consists of the combined cycle station area(ate! oil
unloading areas, ehemieal loading4mleading areas, li"id storage tanks, and
switehyaMs . (Duke Energy comment)Fuel and chemical loading and storage areas
drain to wastewater.
• Outfall SWO 10: Drainage area consists of the combined cycle station area{fttel--
unloading afeas, chemieal loading4Hiloading areas, liquid star-age tanks, and
switehyar-ds). (Duke EneM comment)Fuel and chemical loading and storage areas
drain to wastewater.
Additional Outfalls
Stormwater outfall SW001 no longer receives industrial stormwater. Outfalls SWO04, SWO05,
and SWO06 do not contain industrial activity. Any modifications to these outfalls that result in
a potential stormwater discharge associated with past or present industrial activities will
require a modification of this permit.
Should the permittee identify or create any new stormwater outfalls, remove any stormwater
outfalls identified in this permit, or alter any drainage areas that change the potential pollutants in
runoff discharged through corresponding outfalls, the permittee will submit a request to NC
DEMLR to modify this permit. For any newly discovered pipes or outfalls, the permittee must
evaluate the structure and provide a report of the status and planned actions to NC DEQ within
14 days. The permittee must either(1) request modification of this permit and modify the
SWPPP accordingly, or(2) eliminate potential 4�o #es by removal,plugging, or combination
of both.

Permit NCS000575
NPDES Wastewater Permit NC0000396 requires the facility to conduct fish tissue monitoring
once during that permit term for arsenic (As), selenium (Se), and mercury(Hg) in accordance
with a Sampling Plan approved by the Division of Water Resources. The permittee shall submit
annually a summary of the results of the fish tissue monitoring results to the DEMLR
Stormwater Permitting Program(Central Office) and indicate the location of sampling in relation
to stormwater discharge outfalls. This reporting timeframe differs from the NPDES Wastewater
Permit, which directs that fish tissue analysis results be submitted with the wastewater discharge
permit renewal application.
D-3. Methodology for Collecting Samples
(a) Outfall monitoring efforts shall begin with the first measurable storm event that occurs
during the facility's normal operating hours and begins at least 72 hours after the previous
measurable storm event.
(b) Grab samples shall be collected within the first 30 minutes of discharge. If physical
separation between outfalls prevents collecting samples from all outfalls within the first 30
minutes of discharge, then the permittee may continue collecting samples until all outfalls
that are discharging have been sampled.
(c) Outfalls that are not discharging during or after the first measurable storm event shall be
sampled during the next measurable storm event, until a sample has been collected from
every outfall.
(d) If, during an entire monitoring period, there is no discharge from an outfall during any
measurable storm event that occurs during the facility's normal operating hours and
begins at least 72 hours after the previous measurable storm event, then the permittee shall
report"No Discharge" in the DMR and shall record"No Discharge" in the SWPPP. In this
case, the DMR shall be submitted within 30 days after the end of the monitoring period.
Lack of a discharge from an outfall for the monitoring period shall not constitute failure to
monitor as long as this condition is met.
(e) Sampling is not required to be performed outside of the facility's normal operating hours
or during adverse weather conditions.
(f) Samples collected shall be characteristic of the volume and nature of the permitted
discharge.
(g) If the sampled storm event coincides with a known non-stormwater discharge that is
deemed permitted under 15A NCAC 02H .0106, then this shall be noted on the
stormwater discharge monitoring report.
D-4. Locations for Collecting Samples
Samples shall be collected at all stormwater discharge outfalls (SDOs)that discharge stormwater
associated with industrial activity. If the Division has issued a representative outfall status (ROS)
approval letter, then the permittee shall collect samples from all SDOs in accordance with the
ROS approval letter.
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Permit NCS000575
(a) All samples shall be taken before the discharge joins or is diluted by any other waste
stream, body of water, or substance.
(b) Monitoring points as specified in this permit shall not be changed without written
notification to and approval by the Division [40 CFR 122.41(j)].
D-5. Tier One Response: Single Benchmark Exceedance
The facility will remain in Tier One status until three consecutive samples are under the
benchmark or are inside the benchmark range for all parameters.
(a) If any sampling result is above the benchmark value for any parameter at any outfall,then
the permittee shall respond in accordance with Table 2 to identify and address the source
of that exceedance for the parameter(s).
(b) Each required response shall be documented in the SWPPP as each action occurs
including; the date and value of the benchmark exceedance,the date the Division's
Asheville Regional Office was notified of the exceedance, the inspection date, the
personnel conducting the inspection, the selected feasible actions, and the date the
selected feasible actions were completed.
(c) Each exceedance of a benchmark parameter shall individually require a Tier One
response.
(d) The Tier One response shall be in accordance with Table 2 below:
Table 2: Tier One Response for a Benchmark Exceedance
Timeline from Receipt Tier One Required Response/Action
of Sampling Results
Continuously i. Document the exceedance and each required response/action in
the SWPPP in accordance with Part D-5 of the permit.
Within two weeks ii. Notify the Division's Asheville Regional Office of the
exceedance date and value via email or, when it is developed, an
electronic form created by the Division for reporting exceedances.
iii.Conduct a stormwater management inspection.
iv.Identify and evaluate possible causes of the benchmark
exceedance.
Within one month v. Select specific, feasible courses of action to reduce concentrations
of the parameter(s) of concern including, but not limited to,
source controls, operational controls, or physical improvements.
Within two months vi.Implement the selected feasible actions.
D-6. Tier Two Response: Two Consecutive Benchmark Exceedances
The facility will remain in Tier Two status until three consecutive samples are under the
benchmark or are inside the benchmark range for all parameters.
(a) If any two consecutive sampling results in a row are above the benchmark value for any
parameter at an outfall, then the permittee shall respond in accordance with Table 3 to
identify and address the source of exceedances for that parameter at that outfall.
(b) After implementing the specific feasible courses of action, perform monthly monitoring
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Permit NCS000575
for all analytical monitoring parameters at outfall(s) in Tier Two status until three samples
in a row are below the benchmark value.
(c) Each required response shall be documented in the SWPPP as each action occurs
including; the dates and values of the benchmark exceedances, the date the Division's
Asheville Regional Office was notified of the consecutive exceedances, the inspection
date,the personnel conducting the inspection,the selected feasible actions, the date the
selected feasible actions were completed, and the monthly monitoring results.
(d) Each pair of two consecutive exceedances of a single benchmark parameter at a single
outfall shall constitute an event that requires a Tier Two response. Subsequent events shall
not include the same exceedances that have been addressed in a Tier Two response.
(e) The Tier Two response shall be in accordance with Table 3 below.
(f) Alternatively, in lieu of the steps listed above, the permittee may, after two consecutive
exceedances exercise the option of contacting the DEMLR Regional Engineer as provided
below in Tier Three. The Regional Engineer may require additional response actions on
the part of the permittee as provided in Tier Three, including reduced or additional
sampling parameters or frequency.
Table 3: Tier Two Res onse for Two Consecutive Benchmark Exceedances
Timeline from Receipt of Tier Two Required Response/Action
Sampling Results
Continuously i. Document the exceedance and each required response/action in
the SWPPP in accordance with Part D-6 of the permit.
ii. Monitor all parameters monthly(qualitative and quantitative)at
appropriate outfall(s)
Within two weeks iii. Notify the Division's Asheville Regional Office in writing of
the exceedance date and value.
iv. Conduct a stormwater management inspection.
v. Identify and evaluate possible causes of the benchmark
exceedance.
Within one month vi. Select specific, feasible courses of action to reduce
concentrations of the parameter(s) of concern including,but not
limited to, source controls, operational controls, or physical
improvements.
D-7. Tier Three Response: Four Benchmark Exceedances Within 5 Years
The facility will remain in Tier Three status until three consecutive samples are under the
benchmark or are inside the benchmark range for all parameters.
(a) If any four sampling results within a five-year period for any single parameter are above
the benchmark value at a sampled outfall, then the permittee shall respond in accordance
with Table 4 to identify and address the source of exceedances for that parameter at that
outfall.
(b) The permittee shall prepare a written Action Plan and submit to the Division's Asheville
Regional Office for review and approval within thirty(30) days of receipt of the fourth
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Permit NCS000575
analytical monitoring data point that exceeds the benchmark value. See Section G-1. (b)
for reporting requirements. At a minimum, the Action Plan shall include:
i. documentation of the four benchmark exceedances;
ii. an inspection report that covers the industrial activities within the drainage area of
the outfall with the exceedances (including the date of the inspection and the
personnel conducting the inspection);
iii. an evaluation of standard operating procedures and good housekeeping
procedures;
iv. identification of the source(s) of exceedances;
V. specific actions that will be taken to remedy the identified source(s)with a
schedule for completing those actions; and
vi. a monitoring plan to verify that the Action Plan has addressed the source(s).
(c) The permittee shall keep the Action Plan in the SWPPP and document when each specific
action was carried out and by whom.
(d) The permittee shall contact the Division's Asheville Regional Office when all actions in
the Action Plan are completed.
(e) The Division may,but is not limited to, require the permittee to:
i. Revise, increase, or decrease the monitoring and reporting frequency for some or
all of the parameters herein;
ii. Perform additional sampling or sample for substitute parameters;
Ili. Install structural stormwater control measures;
iv. Implement other stormwater control measures;
V. Perform upstream and downstream monitoring to characterize impacts on
receiving waters;
vi. Implement site modifications to qualify for a No Exposure Exclusion; and/or
vii. Continue Tier Three obligations through the permit renewal process.
(f) The Tier Three response shall be in accordance with Table 4 below.
Table 4: Tier Three Res onse for Four Benchmark Exceedances Within Five Years
Timeline from Receipt of Tier Three Required Response/Action
Fourth Sampling Result
Continuously i. Document the exceedances and each required response/action
in the SWPPP in accordance with Part D-7 of the permit.
ii. Monitor all parameters monthly(qualitative and quantitative)
at appropriate outfall(s).
Within two weeks iii. Notify the Division's Asheville Regional Office in writing of
the affected outfall, four exceedance dates and values.
iv. Conduct a stormwater management inspection.
v. Identify and evaluate possible causes of the benchmark
exceedance.
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Permit NCS000575
Within one month vi. Prepare an Action Plan and submit to the Division's Asheville
Regional Office for review and approval.
Upon DEQ Approval vii.Implement the approved Action Plan.
Upon Completion of viii. Notify the Division's Asheville Regional Office of Action
Approved Action Plan Plan completion.
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Permit NCS000575
PART E: SUBMITTAL OF DISCHARGE MONITORING REPORTS (DMRs)
E-1. Deadlines for Submittal of Discharge Monitoring Reports
Discharge Monitoring Reports (DMRs) shall be submitted in accordance with Table 5 below. For
permits issued between March 1-31, June 1-30, September 1-30 or December 1-31, sampling
shall not commence until the next sampling period following initial issuance of the permit.
Table 5: Reporting Requirements
Monitoring Period Deadline
January 1 —March 30 April 30
April 1 —June 30 July 30
July 1 —September 30 October 30
October 1 —December 31 January 30
E-2. Electronic Discharge Monitoring Reporting (eDMR)Process
Unless otherwise informed by the Director, permittees are required to register for eDMR within
30 days of the permit issuance date. Permittees shall follow the guidelines for submitting data
that are set forth in the Stormwater eDMR User Manual, available on the Division's website at
deq.nc.gov/SW-eDMR.
E-3. Occurrences of No Discharge
If no discharge occurs during the sampling period, the permittee must record within 30 days of
the end of the sampling period in the facility's monitoring records in accordance with the
guidelines for submitting data that are set forth in the Stormwater eDMR User Manual, available
on the Division's website at deq.nc.gov/SW-eDMR.
E-4. Reports if More Frequent Monitoring Has Occurred
If the permittee monitors any pollutant more frequently than required by this permit using test
procedures approved under 40 CFR Part 136 and at a sampling location specified in this permit,
the results of such monitoring shall be included in the data submitted on the DMR. However, for
purposes of benchmark comparison and Tiered response actions, the permittee shall use the
analytical results from the first sample with valid results within the monitoring period and submit
it no later than 30 days from that date the facility receives the sampling results.
E-5. Report if Begin Discharging to a New Stormwater Discharge Outfall
The permittee shall submit a letter describing the modification and an updated site map to the
Division prior to discharging to a new SDO. Division approval must be granted in writing prior
to discharging to a new SDO.
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Permit NCS000575
E-6. Qualitative Monitoring Reports
The permittee shall record the required qualitative monitoring observations on the SDO
Qualitative Monitoring Report form provided by the Division at deq.nc.gov/SW-industrial and
shall retain the completed forms on site. Qualitative monitoring results shall not be submitted to
the Division, except upon the Division's specific requirement to do so. Qualitative Monitoring
Report forms are available on the Division's website.
E-7. Monitoring Report Retention
Copies of the following reports shall be maintained on-site or be available electronically to the
Division upon request. These records or copies shall be maintained for a period of at least five
(5) years from the date of the sample, measurement, report, permit renewal, or permit
application. This period may be extended by request of the Director at any time [40 CFR
122.41].
(a) Calibration and maintenance records,
(b) Original strip chart recordings for continuous monitoring instrumentation,
(c) Discharge Monitoring Reports (DMRs) and eDMR or other electronic DMR report
submissions,
(d) Visual monitoring records, and
(e) Copies of all data used to complete the permit application.
E-8. Waivers from Electronic Reporting
(a) If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to
the facility being physically located in an area where less than 10 percent of the
households have broadband access, then a temporary waiver from the NPDES electronic
reporting requirements may be granted and discharge monitoring data may be submitted
on paper DMR forms or alternative forms approved by the Director. Duplicate signed
copies shall be submitted to the mailing address above. See "How to Request a Waiver
from Electronic Reporting" section below.
(b) The permittee may seek a temporary electronic reporting waiver from the Division. To
obtain an electronic reporting waiver, a permittee must first submit an electronic reporting
waiver request to the Division. Requests for temporary electronic reporting waivers must
be submitted in writing to the Division for written approval at least sixty(60) days prior to
the date the facility would be required under this permit to begin submitting monitoring
data and reports. The duration of a temporary waiver shall not exceed five (5)years and
shall thereupon expire. At such time, monitoring data and reports shall be submitted
electronically to the Division unless the permittee re-applies for and is granted a new
temporary electronic reporting waiver by the Division. Approved electronic reporting
waivers are not transferrable. Only permittees with an approved reporting waiver request
may submit monitoring data and reports on paper to the Division for the period that the
approved reporting waiver request is effective.
(c) Information on eDMR and the application for a temporary electronic reporting waiver are
found on the DEQ web page at deq.nc.gov/SW-eDMR.
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Permit NCS000575
PART F: OTHER OCCURENCES THAT MUST BE REPORTED
After becoming aware of an occurrence that must be reported, the permittee shall contact the
Division's Asheville Regional Office within the timeframes and in accordance with the other
requirements listed in Table 6 below. Occurrences outside normal business hours may also be
reported to the Department's Environmental Emergency Center personnel at(800) 858-0368.
The permittee shall report all instances of noncompliance not reported under 24-hour reporting at
the time monitoring reports are submitted [40 CFR 122.41(1)(7)].
Table 6: Other Occurrences that Shall Be Reported
Occurrence Reporting Timeframes(After Discovery) and
Other Requirements
Visible Sedimentation in a stream or (a) Within 24 hours, an oral or electronic
wetland notification.
(b) Within 7 calendar days, a report that contains a
description of the sedimentation event and
permittee actions taken to address it.
Oil spills if they are: (c) Within 24 hours, an oral or electronic
• 25 gallons or more, notification. The notification shall include
• less than 25 gallons but cannot be information about the date,time,nature,volume
cleaned up within 24 hours, and location of the spill or release.
• cause sheen on surface waters
(regardless of volume), or
• are within 100 feet of surface waters
(regardless of volume).
Releases of hazardous substances in (d) Within 24 hours, an oral or electronic
excess of reportable quantities under notification. The notification shall include
Section 311 of the Clean Water Act Ref: information about the date,time,nature,volume
40 CFR 110.3and 40 CFR 117.3) or and location of the spill or release.
section 102 of CERCLA(Ref: 40 CFR
302.4) or G.S. 143-215.85
Noncompliance with the conditions of (e) Within 24 hours, an oral or electronic
this permit that may endanger health or notification.
the environment. [40 CFR 122.41(1)(7)] (f) Within 7 calendar days, a report that contains a
description of the noncompliance, and its causes;
the period of noncompliance, including exact
dates and times, and if the noncompliance has not
been corrected, the anticipated time
noncompliance is expected to continue; and steps
taken or planned to reduce, eliminate, and prevent
reoccurrence of the noncompliance. [40 CFR
122.41(1)(6).
(g) Division staff may waive the requirement for a
written report on a case-by-case basis.
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Permit NCS000575
PART G: PERMIT ADMINISTRATION
G-1. Si2natory Requirements
All applications,reports, or information submitted to the Director shall be signed and certified
[40 CFR 122.41(k)].
(a) All permit applications shall be signed as follows:
i. For a corporation: by a responsible corporate officer. For the purpose of this
Section, a responsible corporate officer means: (a) a president, secretary, treasurer
or vice president of the corporation in charge of a principal business function, or
any other person who performs similar policy or decision making functions for the
corporation, or(b)the manager of one or more manufacturing, production, or
operating facilities,provided, the manager is authorized to make management
decisions which govern the operation of the regulated facility including having
the explicit or implicit duty of making major capital investment
recommendations, and initiating and directing other comprehensive measures to
assure long term environmental compliance with environmental laws and
regulations; the manager can ensure that the necessary systems are established or
actions taken to gather complete and accurate information for permit application
requirements; and where authority to sign documents has been assigned or
delegated to the manager in accordance with corporate procedures.
ii. For a partnership or sole proprietorship: by a general partner or the proprietor,
respectively; or
iii. For a municipality, State, Federal, or other public agency: by either a principal
executive officer or ranking elected official [40 CFR 122.22].
(b) All reports required by the permit and other information requested by the Director shall be
signed by a person described in paragraph(a). above or by a duly authorized
representative of that person. A person is a duly authorized representative only if:
i. The authorization is made in writing by a person described above;
ii. The authorization specified either an individual or a position having responsibility
for the overall operation of the regulated facility or activity, such as the position
of plant manager, operator of a well or well field, superintendent, a position of
equivalent responsibility, or an individual or position having overall responsibility
for environmental matters for the company. (A duly authorized representative may
thus be either a named individual or any individual occupying a named position.);
and
iii. The written authorization is submitted to the Director [40 CFR 122.22].
(c) Changes to authorization: If an authorization under paragraph(b) of this section is no
longer accurate because a different individual or position has responsibility for the overall
operation of the facility, a new authorization satisfying the requirements of paragraph(b)
of this section must be submitted to the Director prior to or together with any reports,
information,or applications to be signed by an authorized representative [40 CFR 122.22].
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Permit NCS000575
(d) Certification. Any person signing a document under paragraphs (a) or(b) of this section,
or submitting an electronic report(e.g., eDMR), shall make the following certification [40
CFR 122.22].NO OTHER STATEMENTS OF CERTIFICATION WILL BE
ACCEPTED.
"I certify, under penalty of law, that this document and all attachments were prepared
under my direction or supervision in accordance with a system designed to assure that
qualified personnel properly gather and evaluate the information submitted. Based on my
inquiry of the person or persons who manage the system, or those persons directly
responsible for gathering the information, the information submitted is, to the best of my
knowledge and belief, true, accurate, and complete. I am aware that there are significant
penalties for submitting false information, including the possibility of fines and
imprisonment for knowing violations."
G-2. Permit Expiration
The permittee is not authorized to discharge after the expiration date. In order
to receive automatic authorization to discharge beyond the expiration date,the
permittee shall submit forms and fees as are required by the agency authorized to issue
permits no later than 180 days prior to the expiration date,unless permission for a later date has
been granted by the Director. (The Director shall not grant permission for applications to be
submitted later than the expiration date of the existing permit) [40 CFR 122.21(d)]. Any
permittee that has not requested renewal at least 180 days prior to expiration, or any permittee
that does not have a permit after the expiration and has not requested renewal at least 180 days
prior to expiration, will be subjected to enforcement procedures as provided in NCGS §143-
215.36 and 33 USC 1251 et. seq.
G-3. Planned Changes
The permittee shall give notice to the Director as soon as possible of any planned changes at the
permitted facility which could significantly alter the nature or quantity of pollutants discharged
[40 CFR 122.41(1)]. This notification requirement includes pollutants which are not specifically
listed in the permit or subject to notification requirements under 40 CFR Part 122.42(a).
G-4. Transfers
This permit is not transferable to any person without prior written notice to and approval from
the Director in accordance with 40 CFR 122.61. The Director may condition approval in
accordance with NCGS 143-215.1, in particular NCGS 143-215.1(b)(4)b.2. and may require
modification or revocation and reissuance of the permit, or a minor modification, to identify the
new permittee and incorporate such other requirements as may be necessary under the CWA [40
CFR 122.41(1)(3), 122.61] or state statute.
G-5. Sale or Closure
The Permittee is required to notify the Division in writing in the event the permitted facility is
sold or closed.
G-6. Permit Modification,Revocation and Reissuance, or Termination
The issuance of this permit does not prohibit the Director from reopening and modifying the
permit, revoking and reissuing the permit, or terminating the permit as allowed by the laws,
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Permit NCS000575
rules, and regulations contained in Title 40, Code of Federal Regulations, Parts 122 and 123;
Title 15A of the North Carolina Administrative Code, Subchapter 2H .0100; and North Carolina
General Statute 143-215.1 et al. After public notice and opportunity for a hearing, the permit
may be terminated for cause. The filing of a request for a permit modification, revocation and
reissuance, or termination does not stay any permit condition.
G-7. Anticipated Noncompliance
The permittee shall give advanced notice to the Director of any planned changes at the permitted
facility which may result in noncompliance with the permit [40 CFR 22.41(1)(2)].
G-8. Requirement to Report Incorrect Information
Where the Permittee becomes aware that it failed to submit any relevant facts in a
permit application or submitted incorrect information in a permit application or in any report to
the Director, it shall promptly submit such facts or information [40 CFR 122.41(1)(8)].
G-9. Annual Administering and Compliance Monitoring Fee Requirements
The permittee must pay the administering and compliance monitoring fee within 30 (thirty) days
after being billed by the Division. Failure to pay the fee in timely manner in accordance with
15A NCAC 2H .0105(b)(2) may cause this Division to initiate action to revoke coverage under
this permit.
G-10. Flow Measurements
Where required, appropriate flow measurement devices and methods consistent with accepted
scientific practices shall be selected and used to ensure the accuracy and reliability of
measurements of the volume of monitored discharges.
G-11. Test Procedures
Test procedures for the analysis of pollutants shall conform to the EMC regulations published
pursuant to NCGS 143-215.63 et. seq, the Water and Air Quality Reporting Acts, and to
regulations published pursuant to Section 304(g), 33 USC 1314, of the Federal Water Pollution
Control Act, as Amended, and Regulation 40 CFR 136.
To meet the intent of the monitoring required by this permit, all test procedures must produce
minimum detection and reporting levels and all data generated must be reported down to the
minimum detection or lower reporting level of the procedure.
If no approved methods are determined capable of achieving minimum detection and reporting
levels below the permit discharge requirements,then the most sensitive (method with the lowest
possible detection and reporting level) approved method must be used.
G-12. Representative Outfall
If a facility has multiple discharge locations with substantially identical stormwater discharges
that are required to be sampled, the permittee may petition the Director for representative outfall
status. If it is established that the stormwater discharges are substantially identical, and the
permittee is granted representative outfall status,then analytical sampling requirements may be
performed at a reduced number of outfalls.
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G-13. Availability of Reports
Except for data determined to be confidential under NCGS 143-215.3(a)(2) or Section 308 of the
Federal Act, 33 USC 1318, all reports prepared in accordance with the terms shall be available
for public inspection at the offices of the Division. As required by the Act, analytical data shall
not be considered confidential. Knowingly making any false statement on any such report may
result in the imposition of criminal penalties as provided for in NCGS 143-215.613 or in Section
309 of the Federal Clean Water Act.
G-14. Permit Actions
The permit may be modified,revoked and reissued, or terminated for cause. The notification of
planned changes or anticipated noncompliance does not stay any permit condition [40 CFR
122.41(f)].
G-15. Recording Results
For each measurement or sample taken pursuant to the requirements of this permit,
the permittee shall record the following information [40 CFR 122.41]:
(a) The date, exact place, and time of sampling or measurements;
(b) The individual(s)who performed the sampling or measurements;
(c) The date(s) analyses were performed;
(d) The individual(s)who performed the analyses;
(e) The analytical techniques or methods used; and
(f) The results of such analyses.
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Permit NCS000575
PART H: OPERATION AND MAINTENANCE of POLLUTION CONTROLS
H-1. Proper Operation and Maintenance
The permittee shall at all times:
(a) Properly operate and maintain all facilities and systems of treatment and control and
related appurtenances which are installed or used by the permittee to achieve compliance
with the conditions of this permit.
(b) Implement laboratory controls and quality assurance procedures for onsite labs
and field parameter testing.
(c) Operate back-up or auxiliary facilities or similar systems which are installed by a
permittee only when the operation is necessary to achieve compliance with the conditions
of this permit [40 CFR 122.41(e)].
H-2. Corrective Actions
The permittee shall take corrective actions if self-inspections required by this permit identify a
need for corrective actions, a facility fails to perform satisfactorily, or a facility creates nuisance
conditions.
Corrective actions shall include,but not be limited to: maintenance, modifications, or additions
to existing control measures,the construction of additional or replacement treatment or disposal
facilities, or implementation of new BMPs. Corrective actions shall be completed as soon as
possible considering adverse weather and site conditions.
H-3. Draw Down of Treatment Facilities for Essential Maintenance
The permittee may draw down stormwater and wastewater treatment facilities if the drawdown is
for essential maintenance to assure efficient operation and one of the following conditions is met:
(a) Either treatment facilities shall be drawn down from the surface, or
(b) Analytical sampling data of the water stored in the treatment facility demonstrates that the
discharge will not exceed benchmarks or violate effluent limitations in this permit. The
sampling data shall be collected no more than 14 calendar days prior to the draw down.
H-4. Bypasses of Stormwater Control Facilities
Bypass is prohibited, and the Division may take enforcement action against a permittee
for bypass unless the permittee provides engineering evidence that all three of the following
conditions are met:
(a) The bypass was unavoidable to prevent loss of life,personal injury or severe property
damage;
(b) There were no feasible alternatives to the bypass, such as the use of auxiliary control
facilities, retention of stormwater, or maintenance during normal periods of equipment
downtime or dry weather. This condition is not satisfied if adequate backup controls
should have been installed in the exercise of reasonable engineering judgment to prevent a
bypass which occurred during normal periods of equipment downtime or preventive
maintenance; and
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Permit NCS000575
(c) The permittee submitted notices and identified the reason(s) for the bypass as required
under Part H6 of this permit.
If the Director determines that it will meet the three conditions listed above, the Director
may approve an anticipated bypass after considering its adverse effects.
H-5. Upsets
Diversions of stormwater and wastewater from treatment facilities may be considered
as an upset if the permittee can demonstrate to the Director that all of the following conditions
have been met. In any enforcement proceeding,the permittee seeking to establish the occurrence
of an upset has the burden of proof.
(a) The permittee demonstrates that the upset was not caused by operational error, improperly
designed treatment or control facilities, lack of preventive maintenance, or careless or
improper operation.
(b) The permittee agrees to take remedial measures if necessary.
(c) The permittee submitted notice of the upset and identified the cause(s) of the upset as
required under part H6 of this permit.
H-6. Required Notice for Bypass or Upset
After a permittee becomes aware of an occurrence that must be reported, the permittee shall
contact the Division's Asheville Regional Office within the timeframes and in accordance with
the requirements listed in Table 7 below. Occurrences outside normal business hours may also be
reported to the Department's Environmental Emergency Hotline at [phone].
Table 7: Bypass and Upset Re rtin Requirements
Event
[40 CFR 122.41(m)(3)] Reporting Requirements
Anticipated Bypass Written report at least ten days prior to the anticipated
bypass. The written report shall include an evaluation of the
anticipated quantity, quality and effect of the bypass.
Unanticipated Bypass or Oral or electronic notification within 24 hours of the event,
Upset and
Written report within 7 calendar days of the event. The
written report shall include an evaluation of the quantity,
quality and effect of the bypass.
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Permit NCS000575
PART I: COMPLIANCE AND LIABILITY
I-1. Compliance Schedule
The permittee shall comply with Limitations and Controls specified for stormwater discharges in
accordance with the following schedule:
(a) Facilities applying for permit renewal: All requirements, conditions, limitations, and
controls contained in this permit(except new SWPPP elements in this permit renewal)
shall become effective immediately upon issuance of this permit. New elements of the
Stormwater Pollution Prevention Plan for this permit renewal shall be developed and
implemented within 6 months of the effective date of this permit and updated thereafter on
an annual basis. Secondary containment, as specified in B-9 of this permit shall be
accomplished prior to the beginning of stormwater discharges from the operation of the
industrial activity.
I-2. Duty to Comply
The permittee must comply with all conditions of this permit. Any permit noncompliance
constitutes a violation of the Clean Water Act(CWA) and is grounds for enforcement action; for
permit termination,revocation and reissuance, or modification; or denial of a permit upon
renewal application [40 CFR 122.41].
(a) The permittee shall comply with standards or prohibitions established under section
307(a) of the CWA for toxic pollutants within the time provided in the regulations that
establish these standards or prohibitions, even if the permit has not yet been modified to
incorporate the requirement [40 CFR 122.41].
(b) The CWA provides that any person who violates section[s] 301, 302, 306, 307, 308, 318
or 405 of the Act, or any permit condition or limitation implementing any such sections in
a permit issued under section 402, or any requirement imposed in a pretreatment program
approved under sections 402(a)(3) or 402(b)(8) of the Act, is subject to a civil penalty not
to exceed $51,570 per day for each violation [33 USC 1319(d) and 40 CFR 122.41(a)(2)].
(c) The CWA provides that any person who negligently violates sections 301, 302, 306, 307,
308, 318, or 405 of the Act, or any condition or limitation implementing any of such
sections in a permit issued under section 402 of the Act, or any requirement imposed in a
pretreatment program approved under section 402(a)(3) or 402(b)(8) of the Act, is subject
to criminal penalties of$2,500 to $25,000 per day of violation, or imprisonment of not
more than 1 year, or both. In the case of a second or subsequent conviction for a negligent
violation, a person shall be subject to criminal penalties of not more than $50,000 per day
of violation, or by imprisonment of not more than 2 years, or both [33 USC 1319(c)(1)
and 40 CFR 122.41(a)(2)].
(d) Any person who knowingly violates such sections, or such conditions or limitations is
subject to criminal penalties of$5,000 to $50,000 per day of violation, or imprisonment
for not more than 3 years, or both. In the case of a second or subsequent conviction for a
knowing violation, a person shall be subject to criminal penalties of not more than
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Permit NCS000575
$100,000 per day of violation, or imprisonment of not more than 6 years, or both [33 USC
1319(c)(2) and 40 CFR 122.41(a)(2)].
(e) Any person who knowingly violates section 301, 302, 303, 306, 307, 308, 318 or 405 of
the Act, or any permit condition or limitation implementing any of such sections in a
permit issued under section 402 of the Act, and who knows at that time that he thereby
places another person in imminent danger of death or serious bodily injury, shall, upon
conviction, be subject to a fine of not more than $250,000 or imprisonment of not more
than 15 years, or both. In the case of a second or subsequent conviction for a knowing
endangerment violation, a person shall be subject to a fine of not more than $500,000 or
by imprisonment of not more than 30 years, or both. An organization, as defined in
section 309(c)(3)(B)(iii) of the CWA, shall,upon conviction of violating the imminent
danger provision,be subject to a fine of not more than $1,000,000 and can be fined up to
$2,000,000 for second or subsequent convictions [40 CFR 122.41(a)(2)].
(f) Under state law, a civil penalty of not more than $25,000 per violation may be assessed
against any person who violates or fails to act in accordance with the terms, conditions, or
requirements of a permit [North Carolina General Statutes § 143-215.6A].
(g) Any person may be assessed an administrative penalty by the Administrator for violating
section 301, 302, 306, 307, 308, 318 or 405 of this Act, or any permit condition or
limitation implementing any of such sections in a permit issued under section 402 of this
Act. Administrative penalties for Class I violations are not to exceed$20,628 per
violation, with the maximum amount of any Class I penalty assessed not to exceed
$51,570. Penalties for Class II violations are not to exceed $20,628 per day for each day
during which the violation continues, with the maximum amount of any Class II penalty
not to exceed $257,848 [33 USC 1319(g)(2) and 40 CFR 122.41(a)(3)].
I-3. Duty to Mitigate
The permittee shall take all reasonable steps to minimize or prevent any discharge in violation of
this permit which has a reasonable likelihood of adversely affecting human health or the
environment [40 CFR 122.41(d)].
I-4. Civil and Criminal Liability
Except as provided in Part H-4 of this permit regarding bypassing of stormwater control
facilities, nothing in this permit shall be construed to relieve the permittee from any
responsibilities, liabilities, or penalties for noncompliance pursuant to NCGS 143-215.3,
143-215.6, or Section 309 of the Federal Act, 33 USC 1319. Furthermore,the permittee is
responsible for consequential damages, such as fish kills, even though the responsibility
for effective compliance may be temporarily suspended.
I-5. Oil and Hazardous Substance Liability
Nothing in this permit shall be construed to preclude the institution of any legal action or relieve
the permittee from any responsibilities, liabilities, or penalties to which the permittee is or may
be subject to under NCGS 143-215.75 et seq. or Section 311 of the Federal Act, 33 USC 1321.
Page 32 of 40

Permit NCS000575
I-6. Property Rights
The issuance of this permit does not convey any property rights in either real or personal
property, or any exclusive privileges, nor does it authorize any injury to private property or any
invasion of personal rights,nor any infringement of federal, state or local laws or regulations [40
CFR 122.41(g)].
I-7. Severability
The provisions of this permit are severable, and if any provision of this permit, or the application
of any provision of this permit to any circumstances, is held invalid, the application of such
provision to other circumstances, and the remainder of this permit, shall not be affected thereby
[NCGS 15013-23].
I-8. Duty to Provide Information
The permittee shall furnish to the Director, within a reasonable time, any information which the
Director may request to determine whether cause exists for modifying,revoking and reissuing, or
terminating the permit issued pursuant to this permit or to determine compliance with this
permit. The permittee shall also furnish to the Director, upon request, copies of records required
to be kept by this permit [40 CFR 122.41(h)].
I-9. Penalties for Tampering
The Clean Water Act provides that any person who falsifies, tampers with, or knowingly renders
inaccurate, any monitoring device or method required to be maintained under
this permit shall,upon conviction, be punished by a fine of not more than$10,000 per violation,
or by imprisonment for not more than two years per violation, or by both. If a conviction of a
person is for a violation committed after a first conviction of such person under this paragraph,
punishment is a fine of not more than $20,000 per day of violation, or by imprisonment of not
more than four years, or both [40 CFR 122.41].
I-10. Penalties for Falsification of Reports
The Clean Water Act provides that any person who knowingly makes any false statement,
representation, or certification in any record or other document submitted or required to be
maintained under this permit, including monitoring reports or reports of compliance or
noncompliance shall, upon conviction,be punished by a fine of not more than $10,000 per
violation, or by imprisonment for not more than six months per violation, or by both [40 CFR
122.41].
I-11. Onshore or Offshore Construction
This permit does not authorize or approve the construction of any onshore or offshore physical
structures or facilities or the undertaking of any work in any navigable waters.
I-12. Duty to Reapply
If the permittee wishes to continue an activity regulated by this permit after the expiration date of
this permit, the permittee must apply for and obtain a new permit [40 CFR 122.41(b)].
I-13. Inspection and Entry
The permittee shall allow the Director, or an authorized representative (including
Page 33 of 40

Permit NCS000575
an authorized contractor acting as a representative of the Director), or in the case of a facility
which discharges through a municipal separate storm sewer system, an authorized representative
of a municipal operator or the separate storm sewer system receiving the discharge,upon the
presentation of credentials and other documents as may be required by law, to:
(a) Enter upon the permittee's premises where a regulated facility or activity is located or
conducted, or where records must be kept under the conditions of this permit;
(b) Have access to and copy, at reasonable times, any records that must be kept under the
conditions of this permit;
(c) Inspect at reasonable times any facilities, equipment(including monitoring and control
equipment), practices, or operations regulated or required under this permit; and
(d) Sample or monitor at reasonable times, for the purposes of assuring permit compliance or
as otherwise authorized by the Clean Water Act, any substances or parameters at any
location [40 CFR 122.41(i)].
I-14. Need to Halt or Reduce Not a Defense
It shall not be a defense for a permittee in an enforcement action that it would have been
necessary to halt or reduce the permitted activity in order to maintain compliance with the
condition of this permit [40 CFR 122.41(c)].
Page 34 of 40

Permit NCS000575
PART J: DEFINITIONS
Act
See Clean Water Act.
Adverse Weather
Adverse conditions are those that are dangerous or create inaccessibility for personnel, such as
local flooding, high winds, or electrical storms, or situations that otherwise make sampling
impractical. When adverse weather conditions prevent the collection of samples during the
sample period,the permittee must take a substitute sample or perform a visual assessment during
the next qualifying storm event. Documentation of an adverse event (with date, time and written
narrative) and the rationale must be included with SWPPP records. Adverse weather does not
exempt the permittee from having to file a monitoring report in accordance with the sampling
schedule. Adverse events and failures to monitor must also be explained and reported on the
relevant DMR.
Allowable Non-Stormwater Discharges
This permit regulates stormwater discharges. However, non-stormwater discharges which shall
be allowed in the stormwater conveyance system include:
(a) All other discharges that are authorized by a non-stormwater NPDES permit.
(b) Uncontaminated groundwater, foundation drains, air-conditioner condensate without added
chemicals, springs, discharges of uncontaminated potable water, waterline and fire hydrant
flushings, water from footing drains, flows from riparian habitats and wetlands.
(c) Discharges resulting from fire-fighting or fire-fighting training, or emergency shower or
eye wash as a result of use in the event of an emergency.
Best Management Practices (BMPs)
Measures or practices used to reduce the amount of pollution entering surface waters. BMPs may
take the form of a process, activity, or physical structure. More information on BMPs can be
found on the Environmental Protection Agency's website.
Bypass
A bypass is the known diversion of stormwater from any portion of a stormwater control facility
including the collection system,which is not a designed or established operating mode for the
facility.
Bulk Storage of Liquid Materials
Liquid raw materials, intermediate products,manufactured products,waste materials, or by-
products with a single above ground storage container having a capacity of greater than 660
gallons or with multiple above ground storage containers having a total combined storage
capacity of greater than 1,320 gallons.
Clean Water Act
The Federal Water Pollution Control Act, also known as the Clean Water Act(CWA), as
amended, 33 USC 1251, et. seq.
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Permit NCS000575
Division or DEMLR
The Division of Energy, Mineral, and Land Resources, Department of Environmental Quality.
Director
The Director of the Division of Energy,Mineral, and Land Resources,the permit issuing
authority.
EMC
The North Carolina Environmental Management Commission.
Grab Sample
An individual sample collected instantaneously. Grab samples that will be analyzed
(quantitatively or qualitatively)must be taken within the first 30 minutes of discharge.
Hazardous Substance
Any substance designated under 40 CFR Part 116 pursuant to Section 311 of the Clean Water
Act.
High Quality Waters (HOW)
Supplemental North Carolina water quality classification intended to protect waters which are
rated excellent based on biological and physical/chemical characteristics through Division
monitoring or special studies, or HQW by definition:
(a) Water Supply Watershed I (WS-I),
(b) Water Supply Watershed I1 (WS-II),
(c) SA waters (commercial shellfish),
(d) Outstanding Resource Waters (ORW),
(e) Primary Nursery Areas and other functional nursery areas designated by Marine Fisheries
Commission, or
(f) Waters for which the Division of Water Resources has received a petition for
reclassification to either WS-I or WS-11.
Impaired Waters
Streams, rivers and other bodies of water that do not meet water quality standards and may
require development of a Total Maximum Daily Load(TMDL)per Section 303(d) of the federal
Clean Water Act.
Landfill
A disposal facility or part of a disposal facility where waste is placed in or on land and which is
not a land treatment facility, a surface impoundment, an injection well, a hazardous waste long-
term storage facility or a surface storage facility.
Measurable Storm Event
A storm event that results in an actual discharge from the permitted site outfall. The previous
measurable storm event must have been at least 72 hours prior. The 72-hour storm interval may
Page 36 of 40

Permit NCS000575
not apply if the permittee is able to document that a shorter interval is representative for local
storm events during the sampling period and obtains approval from the local DEMLR Asheville
Regional Office. Two copies of this information and a written request letter shall be sent to the
local DEMLR Asheville Regional Office. After authorization by the DEMLR Asheville Regional
Office, a written approval letter must be kept on site in the permittee's SWPPP.
Municipal Separate Storm Sewer System MS4)
A stormwater collection system within an incorporated area of local self-government such as a
city or town.
No Exposure
A condition of no exposure means that all industrial materials and activities are protected by a
storm-resistant shelter or acceptable storage containers to prevent exposure to rain, snow,
snowmelt, or runoff. Industrial materials or activities include, but are not limited to, material
handling equipment or activities, industrial machinery, raw materials, intermediate products,by-
products, final products, or waste products [40 CFR 122.26 (b)(14)]. DEMLR may grant a No
Exposure Exclusion from NPDES Stormwater Permitting requirements only if a facility
complies with the terms and conditions described in 40 CFR §122.26(g).
Outstanding Resource Water(ORW)
Supplemental North Carolina water quality classification intended to protect unique and special
waters having excellent water quality and being of exceptional state or national, ecological or
recreational significance. To qualify, waters must be rated"excellent"by the NC Division of
Water Resources, and have one of the following outstanding resource values:
(a) Outstanding fish habitat and fisheries,
(b) Unusually high level of water-based recreation or potential for such kind of recreation,
(c) Some special designation such as N.C. Scenic/Natural River, or National Wildlife
Refuge,
(d) Important component of state or national park or forest; or
(e) Special ecological or scientific significance(rare or endangered species habitat,research
or educational areas).
All ORWs are also considered High Quality Waters (HQW)by supplemental classification.
Permittee
The owner or operator issued this permit, who is the legally responsible party for compliance.
Point Source Discharge of Stormwater
Any discernible, confined and discrete conveyance including, but not specifically limited to, any
pipe, ditch, channel,tunnel, conduit,well, or discrete fissure from which stormwater is or may be
discharged to waters of the state.
Representative Outfall Status
When it is established that the discharge of stormwater runoff from a single outfall is
representative of the discharges at multiple outfalls, the Division may grant representative outfall
Page 37 of 40

Permit NCS000575
status. Representative outfall status allows the permittee to perform analytical monitoring at a
reduced number of outfalls.
Secondary Containment
Spill containment for the contents of the single largest tank within the containment structure plus
sufficient freeboard to contain the 25-year, 24-hour storm event.
Section 313 Water Priority Chemical
A chemical or chemical category which:
(a) Is listed in 40 CFR 372.65 pursuant to Section 313 of Title III of the Superfund
Amendments and Reauthorization Act(SARA) of 1986, also titled the Emergency
Planning and Community Right-to-Know Act of 1986;
(b) Is present at or above threshold levels at a facility subject to SARA title III, Section 313
reporting requirements; and
(c) Meets at least one of the following criteria:
1. Is listed in appendix D of 40 CFR part 122 on Table II (organic priority pollutants),
Table III (certain metals, cyanides, and phenols) or Table IV(certain toxic pollutants
and hazardous substances);
2. Is listed as a hazardous substance pursuant to section 311(b)(2)(A) of the CWA at 40
CFR 116.4; or
3. Is a pollutant for which EPA has published acute or chronic water quality criteria.
Severe Prope . Damage
Substantial physical damage to property, damage to the control facilities which causes them to
become inoperable, or substantial and permanent loss of natural resources which can reasonably
be expected to occur in the absence of a bypass. Severe property damage does not mean
economic loss caused by delays in production.
Significant Materials
Includes, but is not limited to: raw materials; fuels; materials such as solvents, detergents, and
plastic pellets; finished materials such as metallic products; raw materials used in food
processing or production; hazardous substances designated under section 101(14) of CERCLA;
any chemical the facility is required to report pursuant to section 313 of Title III of SARA;
fertilizers; pesticides; and waste products such as ashes, slag and sludge that have the potential to
be released with stormwater discharges.
Significant Spills
Includes, but is not limited to: releases of oil or hazardous substances in excess of reportable
quantities under section 311 of the Clean Water Act(Ref: 40 CFR 110.3and 40 CFR 117.3) or
section 102 of CERCLA (Ref: 40 CFR 302.4).
Stormwater Discharge Associated with Industrial Activity
This term is defined in 40 CFR 122.26(14).
Page 38 of 40

Permit NCS000575
Stormwater Control Measure (SCM)
A permanent structural device that is designed, constructed, and maintained to remove pollutants
from stormwater runoff by promoting settling or filtration or mimic the natural hydrologic cycle
by promoting infiltration, evapotranspiration, post-filtration discharge, reuse of stormwater, or a
combination thereof.
Stormwater Control Systems
All systems at present at the facility used for the control and facilitation of stormwater, including
but not limited to, all drainage systems and all stormwater control measures and best
management practices.
Stormwater Discharge Outfall (SDO)
The point of departure of stormwater from a discernible, confined, or discrete conveyance,
including but not limited to, storm sewer pipes, drainage ditches, channels, spillways, or
channelized collection areas, from which stormwater flows directly or indirectly into waters of
the State of North Carolina.
Stormwater Runoff
The flow of water which results from precipitation and which occurs immediately following
rainfall or as a result of snowmelt.
Stormwater Associated with Industrial Activity
The discharge from any point source which is used for collecting and conveying stormwater and
which is directly related to manufacturing,processing or raw material storage areas at an
industrial site. Facilities considered to be engaged in "industrial activities" include those
activities defined in 40 CFR 122.26(b)(14). The term does not include discharges from facilities
or activities excluded from the NPDES program.
Stormwater Pollution Prevention Plan(SWPPP)
A comprehensive site-specific plan which details measures and practices to reduce stormwater
pollution and is based on an evaluation of the pollution potential of the site.
Total Maximum Daily Load(TMDL)
TMDLs are written plans for attaining and maintaining water quality standards, in all seasons,
for a specific water body and pollutant. A list of approved TMDLs for the state of North Carolina
can be found on the Division's website.
Toxic Pollutant
Any pollutant listed as toxic under Section 307(a)(1) of the Clean Water Act.
Trout Water(Tr)
Supplemental NC water quality classification intended to protect freshwaters for natural trout
propagation and survival of stocked trout on a year round basis. This is not the same as the NC
Wildlife Resources Commission's Designated Public Mountain Trout Waters.
Page 39 of 40

Permit NCS000575
Upset
An exceptional incident in which there is unintentional and temporary noncompliance with
technology-based permit effluent limitations because of factors beyond the reasonable control of
the permittee. An upset does not include noncompliance to the extent caused by operational
error, improperly designed treatment or control facilities, inadequate treatment or control
facilities, lack of preventive maintenance, or careless or improper operation.
Vehicle Maintenance Activity
Vehicle rehabilitation, mechanical repairs,painting, fueling, lubrication, vehicle cleaning
operations, or airport deicing operations. This definition includes equipment maintenance
activity that uses hydraulic oil and that is stored or used outside, or otherwise exposed to
stormwater.
Visible Sedimentation
Solid particulate matter,both mineral and organic,that has been or is being transported by water,
air, gravity, or ice from its site of origin which can be seen with the unaided eye.
10-year, 24-hour Storm Event
The maximum 24-hour precipitation event expected to be equaled or exceeded, on the average,
once in 10 years.
25-year, 24-hour Storm Event
The maximum 24-hour precipitation event expected to be equaled or exceeded, on the average,
once in 25 years.
Page 40 of 40

01.09.23 Asheville NCDEQ Surface Water
Evaluation (only sections applicable to Asheville)

r�
ROY COOPER o
Governor
ELIZABETH S.BISER ` :'
Secretary
RICHARD E.ROGERS,,JR. NORTH CAROLINA
Director Environmen tat 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.
Methodology
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
D EQ��
North Carolina Department of Environmental Quality Division of Water Resources
512 North Salisbury Street 1611 Mail Service Center Raleigh,North Carolina 27699-1611
NORTH CPAOLINA
ppnrh,yM piEmironmunW Ounl� 919.707.9000

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.
Total No.of Surface Water No.of Surface Water Sampling Sites
Facility Sampling Sites and Non- and/or Non-Dispositioned Seeps with
Dis ositioned Seeps Evaluated 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 48 7
Steam Station
Dan River Combined Cycle 29 1
Station
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 20 0
Plant
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(919) 707-3606.
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 Sampling 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-I1,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-01 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 I-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 1 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
draining to Non-Constructed Seep. Seep to established channel within
D-01 French Broad B wetlands west of I-26.Channel flows to C-01 location.
River
Wetlands Non-Constructed Seep. Point of drainage to French Broad
E-01 draining to B River from wetland/braided flow west of I-26 and south of C-
French Broad 01 drainage.
River
Wetlands Non-Constructed Seep. Point of drainage to French Broad
F-01 draining to B River from wetland/braided flow west of 1-26 and south of E-
French Broad
01 drainage.
River
Wetlands Non-Constructed Seep. Point of drainage to French Broad
F-02 draining to B River from wetland/braided flow west of 1-26 and south of F-
French Broad
01 drainage.
River
Wetlands Non-Constructed Seep. Monitoring location within wetland
draining to area west of I-26,at outlet of culvert under I-26.May be
F-03 French Broad B remnant beaver pond. Flows toward F-01 location,then to
River French Broad River.
Unnamed Non-Constructed Seep. Monitoring location of UT below the
tributary to 1982 Ash Basin dam,just east of culvert under I-26,
K-01 Wetlands, B conveying flow to wetlands west of I-26.Flows drain through
drains to wetlands past locations. F-03 and F-01 before entering
French Broad French Broad River.
River
Wetlands Non-Constructed Seep. Monitoring location for coalescence
M-0I 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.
Unnamed Non-Constructed Seep. Seep to small channel upstream of
N-01 Tributary to C
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 Non-Constructed Seep. Western drain(Drain 1)from 1982
82EO-01 Wetlands, B ash basin. Basin has been excavated and repurposed. Any
drains to flow would drain to K-0I and F-0I locations.
French Broad
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
1 DEQ has determined this is not a stream.
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Unnamed
tributary to French drain below divider dike between'64 and past'82
DD-Pipe Wetlands, Not 2 basin. Flow is into former 1982 basin footprint which was
drains to Applicable recently removed from the NPDES permit. Flow would drain
French Broad toward M-01 location and then to sample point at F-01.
River
z This location will need a stream determination by DEQ.
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7• S
Asheville Steam Electric Plant Station—Surface Water Standards Evaluation
eneral Noteshe update to the permit renewal application submitted in 2014 provided instream sampling data for oil&grease,chemical oxygen demand(COD),
hlorides,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
NRWQC,or ISTV
Dissolved Oxygen, • Dissolved Oxygen and Turbidity in stream
FB DOWN Turbidity likely due to factors other than contaminated • None
roundwater.
• 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 likely due to factors other than contaminated • None
groundwater.
• Turbidity in stream likely due to factors other
than contaminated groundwater.
FB-I 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.
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• Turbidity in stream likely due to factors other
than contaminated groundwater.
FB-2 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.
• The naturally occurring background
concentrations for iron are high,therefore no 2B
SW-FBI Iron • None
standard violation was observed for iron at this
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.
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• 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-01 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-H2 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-H3 None standards were not violated at this sampling • None
1982 Basin) location during the evaluation period.
• Based on analysis of the samples,the 2B
SW-13 2012 None standards were not violated at this sampling • None
location during the evaluation period..
P-01 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.
• The naturally occurring background
pH,Dissolved concentrations for iron and manganese are high,
SW-02 Oxygen,Iron, therefore no 2B standard violation was observed • None
Manganese,Cobalt,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 opt ons to characterize surface water.
highway and • Based on analysis of the samples,the 2B
French Broad SW-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
Oxygen,Turbidity, groundwater.
SW-04 Iron,Manganese, • The naturally occurring background None
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
o tions 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
SW-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.
• The naturally occurring background
Cadmium,Cobalt,Manganese, 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.
• Short term monitoring to investigate stormwater
(between 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.
• The naturally occurring background
pH,Turbidity,Iron, concentrations for iron and manganese are high,
Manganese, therefore no 2B standard violation was observed
K-01-A Mercury,Cadmium, • 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
SW-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
Undetermined location during the evaluation period.
(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 during the 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-I1 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)
Parameters that Exceed Required Actions for Use in Developing a Surface
Sample Site a 213 Standard,EPA Comments/Observations Water Assessment Plan
NRWQC,or ISTV
• 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

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
C-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
C-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,
D-01 _ determined to have been collected prior to or Duke Energy shall continue monitoring and reporting
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
Page 11 of 17

• 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
Office staff along with Winston-Salem Duke Energy shall continue monitoring and reporting
Regional Office staff conducted an evaluation of this seep as established in the SOC until approval
F-01 - 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

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.
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
Office staff along with Winston-Salem Duke Energy shall continue monitoring and reporting
Regional Office staff conducted an evaluation of this seep as established in the SOC until approval
F-03 - 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
Office staff along with Winston-Salem Duke Energy shall continue monitoring and reporting
Regional Office staff conducted an evaluation of this seep as established in the SOC until approval
K-01 - 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.
Page 13 of 17

• The sampling data that was reviewed was
determined to have been collected prior to or
during the implementation of the SOC; . Per the SOC termination letter dated May 18,2022,
therefore,no evaluation was performed.
• 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
of the Surface Water Assessment Plan required in
Regional Office staff conducted an evaluation DEQ's Comprehensive Site Assessment comments
M-01 - of AOW identified by Duke and Duke's dated July 14,2021.
Asheville Plant in Buncombe County. Staff also • 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 Survey for the site. Staff concluded that stream evaluation.
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
Office staff along with Winston-Salem Duke Energy shall continue monitoring and reporting
Regional Office staff conducted an evaluation of this seep as established in the SOC until approval
N-01 - 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
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
Ponded Water F - Office staff along with Winston-Salem 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 periodically to determine if conditions have changed
Asheville Plant in Buncombe County. Staff also such that it may warrant DWR staff performing a
reviewed notes from previous DWR site visit
9-28-16 ,USGS maps,NRCS Soil Surveystream evaluation.
Page 14 of 17

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. . Per the SOC termination letter dated May 18,2022,
• On August 14 and 15,2017,DWR Central
Office staff along with Winston-Salem Duke Energy shall continue monitoring and reporting
Regional Office staff conducted an evaluation of this seep as established in the SOC until approval
82E0-01 - of the Surface Water Assessment Plan required in
of AOW identified by Duke and Duke's
also Asheville Plant in Buncombe County. Staff DEQ's Comprehensive Site Assessment comments
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
82EO-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.
• Per the SOC termination letter dated May 18,2022,
• The sampling data that was reviewed was Duke Energy shall continue monitoring and reporting
determined to have been collected prior to or of this seep as established in the SOC until approval
DD-Pipe _ during the implementation of the SOC; of the Surface Water Assessment Plan required in
therefore,no evaluation was performed. DEQ's Comprehensive Site Assessment comments
• This location has not evaluated to determine if dated July 14,2021.
it is a stream and subject to 2B standards. • Duke Energy shall work with DWR's 401 &Buffer
Permitting Branch to determine if this location
Page 15 of 17

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 "LTD066 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 AVLHPND068 AVLSTR003 AVLSTR052 AVLTD074 K-02
SD-01
The following sam le locations were sampled two times for a limited number of constituents of interest. These were not evaluated.
LF-SW-02 1 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 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 SW-101 SW-102 SW-103 SW-104
The following non-dis ositioned seeps 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
onion 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
portion of an NPDES wastewater treatments stem.
Page 17 of 17

NPDES OUTFACE 001 !�_ _ ■Lr 1
y i 1 • r' •� J 0 ;4�
y
- ■ 1 ` NI'DES OUTFACE 002 `
r r -
ry
.
-. .
NPDES OUTFALL 101 . 1 r f ■ -
�
� � 1 a r..rr as 1�'r11■■ w
1- 1 • 1 + mot'
�f 46 fFNOR c�� O
7
LEGEND
SEEP AND SURFACE WATER SAMPLE LOCATIONS
♦ NPDES OUTFALL LOCATION(APPROXIMATE)
"'� 'r^•r � - •• •• 1," ■ • 1964ASH BASIN WASTE BOUNDARY
rn 1 y " ■
`�-, ■ FORMER 1982 ASH BASIN WASTE BOUNDARY
■. °sFT ,■ f -- COMPLIANCE BOUNDARY
� • 9�m - DUKE ENERGY PROGRESS PROPERTY LINE
1 I STREAM AND FLOW DIRECTION(TWT 2016)
FORMER FLUE GAS DESULFURIZATION(FGD)WETLANDS
WETLAND(TWT 2016)
�r=� 11, •�"O'°� SURFACE WATER FLOW DIRECTION
NOTES:
s _ 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.
t. ■ 3.PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY PROGRESS,LLC.
_ 4.AERIAL PHOTOGRAPHY OBTAINED FROM NORTH CAROLINA ONE MAP ON
FEBRUARY 2Q 2020.AERIAL DATED JANUARY 1,2019.
5.DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE
PLANE COORDINATE SYSTEM RIPS 3200(NAD83).
GRAPHIC SCALE
DUKE 375 1 0 375 750
FIGURE 1-2C
t
ENERGY (IN FEET) SITE LAYOUT MAP-SEEP AND SURFACE WATER
PROGRESS DRAWN BY:C.DAVIS DATE:03/24/2020 SAMPLE LOCATIONS
REVISED BY:C.CURRIER DATE:11/18/2020 2020 COMPREHENSIVE SITE ASSESSMENT UPDATE
CHECKED BY:H.CARTER DATE:11/18/2020 ASHEVILLE STEAM ELECTRIC PLANT
APPROVED BY:G.BARRIER DATE:11/18/2020 ARDEN, NORTH CAROLINA
synTerra PROJECT MANAGER G.BARRIER
www.s nterracor .com

Attachment 2c
Asheville Steam Electric Plant
Location ID Location Description Latitude Longitude
A-01-A Upgradient ofA-01 AOW location 35.47087000 -82.55259000
A-01-AA Upgradient of A-01-A surface water 35.46967000 -82.55207000
location
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 35.47347900 -82.55437700
River
FB-D/S French Broad River adjacent to MW-11 35.47348000 -82.55397000
FB-MID French Broad River between MW-16 and 35.46852000 -82.55164000
MW-17
French Broad French Broad Downstream 35.47309000 -82.55421475
Downstream
French Broad French Broad Upstream 35.46087000 -82.54694146
Upstream
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 35.46684059 -82.54858215
drain
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
drain
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 35.46245500 -82.54782400
basin
SWFBR-03 N/Downstream of SWFBR-02, W of 1964 35.46521000 -82.54981200
basin
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 35.46185000 -82.54462501
corner
Non-Dispositioned Seeps
Non- Constructed Seep. Point of drainage
A-01 to French Broad River from 35.47125300 -82.55291401
wetland/braided flow west of I-26.
Northernmost sample locations near river.
A-02 Non- Constructed Seep. Minor seep in 35.47115500 -82.55259601
wet area just upstream of A-01.
Page 2 of 4

Attachment 2c
Channeled flow drains toward A-01
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 I-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 I-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
Page 3 of 4

Attachment 2c
locations. F-03 and F-0I before entering
French Broad River.
Non- Constructed Seep. Monitoring
location for coalescence of seep flows
M-0I 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-0I 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-0I
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-0I location and
then to sample point at F-01.
Page 4 of 4

Attachment 15
General Surface Water Quality Requirements Applicable to All Facilities
1. For all surface water sampling locations required to be included in the facility Interim Monitoring
Plan(EVIP)or Effectiveness MonitoringPlan lan(EMP)(whichever is applicable),the locations shall:
a. be sampled,at a minimum,for the approved site-specific groundwater constituents of interest
per the IlVIPs 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 EV1P or EMT:
a. Duke Energy shall determine if the location is appropriate for inclusion in the facility IMP 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 IMP 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 EWs or EMPs, 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
determined to be streams, then they shall be included in the facility IMP or EMP (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(d)(10)(F).
Page 2 of 2

10.17.22 NCDEQ Compliance with NC CAMA

a STATF� .
4
�R'IXUNwAo
ROY COOPER NORTH CAROLINA
Governor Environmental Quality
ELIZABETH S. BISER
Secretary
October 17, 2022
Jessica Bednarcik
Senior Vice President
Environmental, Health & Safety
Duke Energy
526 South Church Street
Mail Code EC3XP
Charlotte, North Carolina 28202
Subject: Documentation of Compliance with the Coal Ash Management Act of 2014,
Session Law 2014-122, Part II, Section 3.(b), 3.(c)(1) and 3.(c)(2) Coal Ash
Impoundment Excavation and Closure,
Asheville Steam Electric Plant, Buncombe County (1964 Ash Basin)
Dear Ms. Bednarcik:
The North Carolina Department of Environmental Quality (DEQ) has reviewed submittals made
by Duke Energy concerning the coal ash impoundment excavation of the 1964 Basin at the
Asheville Steam Electric Plant (Asheville) in Buncombe County.
Per Part II, Section 3.(b) of the Coal Ash Management Act of 2014, Session Law 2014-122
(CAMA), Asheville was deemed high-priority and was required to close no later than August 1,
2019, and in conformance with Section 3.(c) of LAMA. Section 3.(c)(1) directs, "Impoundments
located in whole above the seasonal high groundwater table shall be dewatered. Impoundments
located in whole or in part beneath the seasonal high groundwater table shall be dewatered to the
maximum extent practicable." Section 3.(c)(2) states, in part, "All coal combustion residuals shall
be removed from the impoundments and transferred for(i) disposal in a coal combustion residuals
landfill, industrial landfill, or municipal solid waste landfill or (ii) use in a structural fill or other
beneficial use as allowed by law..." Subsequently, the Mountain Energy Act of 2015 extended
the removal of all ash to August 1, 2022.
Direction concerning information needed to demonstrate compliance with Part II Sections 3.(b)
and 3.(c) of CAMA closure requirements for Asheville and the other high-priority sites was
submitted by DEQ to Duke Energy in a letter dated January 22, 2019. The items listed below were
submitted by Duke Energy to DEQ to document compliance with the requirements of referenced
CAMA Sections:
R t.,�Y%j
Q�� North Carolina Department of Environmental Quality
217 West Jones Street 1 1601 Mail Service Center Raleigh.North Carolina 27699-1601
o� /`� 919.707.8600

• Coal Ash Excavalion Plan, Asheville Steam Electric Generating Plant submitted on
December 12, 2019.
• Ash Removal Veriticalion Report - 1964 Ash Basin—Asheville Steam Electric Plant dated
August 31, 2022.
• Email from Ashley Healy to Eric Smith and Poonam Girl with the subject,Asheville 1964
Ash Basin Coal Ash Tons Excavaled and Dispositioned sent on September 13, 2022.
• Email from Ashley Healy to Eric Smith with the subject,Asheville 1964 Ash Basin Coal
Ash Tons Excavated and D4sposilioned sent on September 15, 2022.
• Email from Ashely Healy to Eric Smith with the subject, Dicke Energy Asheville 1964
Ash Basin -Ash Removal Geri f cation Report Suhmiaal 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'Ground",aler.
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 Girl (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 resloralion ofgroundwaler quality is degt-aded as a result of the
impoundmenl, corrective action to restore groundtil,aler quality shall be implemenled by the
owner or operator as provided in G.S. 130A-309.20[9]."
North Carolina Department of Environmental Quality
217 West Jones Street 1 1601 Mail Service Center I Raleigh.North Carolina 27699-1601
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(919) 707-3669 or Edward Mussler at(919)
707-8281.
Sincerely, Sincerely, Digitally signed by
Edward F.Mussler
4 III
Date:2022.10.17
�. 14:04:29-04'00'
Ji> e A. Grzy Edward F. Mussler I1I, P.E.
eputy Director Chief, Solid Waste Section
Division of Water Resources 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
D Q
0101'r � North Carolina Department of Environmental Quality
217 West Jones Street 1 1601 Mail Service Center I Raleigh.North Carolina 27699-1601
�^^s^--!!� 919.70Z8600

Young, Brianna A
From: Georgoulias, Bethany
Sent: Monday, February 7, 2022 8:47 AM
To: Young, Brianna A
Subject: RE: [EXTERNAL] Asheville
It's just an FYI. I think Fred Walker from ARO is going.
Bethany Georgoulias (she/her)
Environmental Engineer
Stormwater Program, Division of Energy,Mineral, and Land Resources
N.C.Department of Environmental Quality
919 707 3641 office
[e-mail]
S12 N. Salisbury Street, Raleigh, NC 27604 (location)
1612 Mail Service Center, Raleigh, NC 27699-1612 (mailing)
Website: http://deq.nc.gov/about/divisions/energy-mineral-land-resources/stormwater
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has
adjusted operations to protect the health and safety of the staff and public. Many employees are working remotely or
are on staggered shifts.To accommodate these staffing changes, all DEQ office locations are limiting public access to
appointments only. Please check with the appropriate staff before visiting our offices, as we may be able to handle your
requests by phone or email. We appreciate your patience as we continue to serve the public during this challenging
time.
From:Young, Brianna A
Sent: Monday, February 7, 2022 8:30 AM
To: Georgoulias, Bethany<[e-mail]>
Subject: RE: [EXTERNAL]Asheville
Thanks for the heads up. Should I reach out to Toby about this, or ARO? Looks like I'm missing the site visit today.
Brianna Young, MS(she/her)
Industrial Individual Permits Coordinator
Stormwater Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
[e-mail](e-mail preferred during State of Emergency)
919-707-3647 (office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
1

Email correspondence to and from this address is subject to the North Carolina
Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Many employees are working remotely or are on staggered shifts.
To accommodate these staffing changes,all DEQ office locations are limiting public access to appointments only. Please check with
the appropriate staff before visiting our offices, as we may be able to handle your requests by phone or email.We appreciate your
patience as we continue to serve the public during this challenging time.
From: Georgoulias, Bethany<[e-mail]>
Sent: Monday, February 7, 2022 6:26 AM
To:Young, Brianna A<[e-mail]>
Subject: FW: [EXTERNAL] Asheville
fyi
Bethany Georgoulias (she/her)
Environmental Engineer
Stormwater Program,Division of Energy,Mineral,and Land Resources
N.C.Department of Environmental Quality
919 707 3641 office
bethan [e-mail]
512 N. Salisbury Street, Raleigh, NC 27604 (location)
1612 Mail Service Center, Raleigh, NC 27699-1612 (mailing)
Website: http://deq.nc.gov/about/divisions/energy-mineral-land-resources/stormwater
Ql�
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has
adjusted operations to protect the health and safety of the staff and public. Many employees are working remotely or
are on staggered shifts.To accommodate these staffing changes, all DEQ office locations are limiting public access to
appointments only. Please check with the appropriate staff before visiting our offices, as we may be able to handle your
requests by phone or email. We appreciate your patience as we continue to serve the public during this challenging
time.
From:Vinson,Toby
Sent: Friday, February 4, 2022 3:44 PM
To: Mussler, Ed <[e-mail]>
Cc:Wrenn, Brian L<[e-mail]>; Georgoulias, Bethany<[e-mail]>; Walker, Fred
<[e-mail]>; Aiken, Stan E<[e-mail]>
Subject: RE: [EXTERNAL]Asheville
Do we need to have our folks go out with yours on Monday to look at the SW aspect?
tV
2

William E.Toby Vinson,Jr., PE,CPESC,CPM
Chief of Program Operations and NCORR Liaison
Department of Environmental Quality
Division of Energy, Mineral, and Land Resources
512 N Salisbury St
1612 Mail Service Center
Raleigh, NC 27699
Office: 919-707-9201
Email: [e-mail]
-,i E
.41 ifYI.i! r NA
��D_
aow+ime+w n1 Enri�uero.¢I pgallby
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties.
From: Mussler, Ed <[e-mail]>
Sent: Friday, February 4, 2022 3:35 PM
To: Masemore, Sushma <[e-mail]>; Benzoni, Francisco J <[e-mail]>; Lane, Bill F
<[e-mail]>
Cc:Vinson,Toby<[e-mail]>; Giri, Poonam a <[e-mail]>; Watkins,Jason
<jason.watkins@ncdenr.�ov>
Subject: FW: [EXTERNAL] Asheville
Just in case you hear of this.There was a slope failure at the Asheville CCR landfill.There was no environmental release,
ash ended up in a lined stormwater ditch.
We have a process and reporting procedure that we last used in 2018 when the same thing happened at Dan River.
I don't believe any further action is necessary. Solid Waste Staff will visit Monday am. If there are further questions,
please let me know.
Ed
From: Osborn, Claire J <[e-mail]>
Sent: Friday, February 4, 2022 3:27 PM
To: Mussler, Ed <[e-mail]>; Stanley, Sherri <[e-mail]>; Moutos, Sarah
<[e-mail]>
Subject: FW: [EXTERNAL] Asheville
From: Healy,Ashley Lisbeth <[e-mail]>
Sent: Friday, February 4, 2022 3:25 PM
3

To: Osborn, Claire J <[e-mail]>
Subject: RE: [EXTERNAL]Asheville
CAUTION: External email. Do not click links or open attachments unless you verify.Send all suspicious email as an attachment to
Report Spam.
Hi Claire-
See attached photos of the Asheville CCR Landfill eastern slope and perimeter ditch in regards to the slope failure event
we discussed earlier. I also called out the approximate location of the eastern slope where the event occurred and the
east pond forebay on the WQMP map below for reference.
I will be following up shortly with an email regarding a description of the event as discussed.
Please let me know if you have any other questions, and please also let me know when you would like to visit the Site. If
you would like to visit this weekend, I would recommend Sunday when members of our CCP Team will be available for a
walk down of the area with us. Thanks,Ashley.
4

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Ashley L. Healy, PG
EHS Waste and Groundwater Programs
Duke Energy
Mobile: [phone]
[e-mail]
From: Osborn, Claire J <[e-mail]>
Sent: Friday, February 4, 2022 3:07 PM
To: Healy,Ashley Lisbeth <[e-mail]>
Subject: [EXTERNAL] Asheville
5

*** CAUTION! EXTERNAL SENDER *** STOP. ASSESS.VERIFY!1l Were
• expecting
and spelling correct? Does the content make sense? Can you verify the sender? If suspicious report it, then do
not click links, open attachments or enter your ID or password.
Hey Ashlee,
Can you send some photos of Asheville when you have a moment?
Thanks,
Claire Osborn_P.E.
Emyrony vial Engineer
EQ Division of Fl=4 m7mgannni,Sold F MIR S@Cf m
North Carolina ant of Emgromental Quality
82 9.296.4706(Mbin Office)
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Young, Brianna A
From: Young, Brianna A
Sent: Monday,June 27, 2022 11:44 AM
To: Bednarcik,Jessica L
Cc: Safrit, Don; [e-mail]; [e-mail]
Subject: Asheville Steam Electric Plant (NCS000575) Stormwater Pemrit Renewal Application
Good morning,
The Division of Energy, Mineral, and Land Resources (DEMLR) Stormwater Permitting Program
acknowledges receipt of your renewal application for coverage under NPDES Permit Number NCS000575,
received in our offices on November 4, 2020. Please continue to comply with all conditions and monitoring
requirements in your current NPDES stormwater permit. As long as you have submitted a complete renewal
request package and maintain compliance with those permit conditions, stormwater discharges from this facility
are authorized by that permit until the Division issues a renewal permit or notifies you of an alternative action.
I am working on renewing the individual stormwater permit for the Asheville Steam Electric Plant
(NCS000575). I need additional information in order to 1) confirm that the information I have is correct and 2)
make sure the permit adequately serves the needs of the facility. Please provide the following:
• An electronic spreadsheet summarizing all of the monitoring data that has been collected since the
effective date of the current permit;
• Verification that the information in the renewal application is still complete and correct; and
• An explanation of any operational changes since the renewal application was submitted.
Enter your stormwater permit number into the Stormwater Permit Summary Report and you will see a form that
includes the address of the facility,contact information for the permit, and the regulated stormwater outfall(s)for the
facility. Please review the facility information to make sure it is correct. Information can be updated using the links
provided below,where applicable:
• Facility/Company name or ownership: Name/Ownership Change Form
• Owner Affiliation(Legally responsible person; i.e., someone with the company who is designated to
represent the company per signatory requirements or another authorized representative): Permit Contact
Update Request Form
• Delegation of Signature Authority (DOSA): Permit Contact Update Request Form
• Billing contact: Permit Contact Update Request Form
• Permit contact: Permit Contact Update Request Form
• Facility contact: Permit Contact Update Request Form
• Facility address only: Email Bethany og ulias
• Stormwater outfall information: Email Bethany Geor og ulias
• Visit the eDMR Six Steps website and complete Steps 1 and 2.
• Pay outstanding permit fees: Stormwater ePgMent website
Once I have the above listed information, I can continue my review. You will receive a draft permit for a 30-day
comment period. During this time we will be able to address any comments or concerns you have. During the
same 30-day period, the draft will be sent to a Regional Office staff member for review as well as out to public
notice. Once all comments and concerns are addressed, you may be issued a final permit.
1

Please contact me if you have any questions.
Thank you,
Brianna Young, MS(she/her/hers)
Industrial Individual Permits Coordinator
Stormwater Program
NC DEQ/Division of Energy, Mineral, and Land Resources (DEMLR)
[e-mail](e-mail preferred)
919-707-3647 (office)
Mailing address: 1612 Mail Service Center, Raleigh, NC 27699-1612
Physical address: 512 North Salisbury Street, Raleigh, NC 27604
Email correspondence to and from this address is subject to the North Carolina
Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has adjusted
operations to protect the health and safety of the staff and public. Many employees are working remotely or are on staggered shifts.
Please check with the appropriate staff before visiting our offices,as we may be able to handle your requests by phone or email.We
appreciate your patience as we continue to serve the public during this challenging time.
2

SWO03 - Analytical Monitoring Results
Sample
Freq. SDOMR Parameter
Quarterly Code: 01097 01002 01012 01022 01027 01034 01042 01051 01067 01147 01077 01059 01092 71900 00530 00400
Benchmark Values(mg/L): 0.09 0.34 0.065 N/A 0.003 0.9 0.010 0.075 0.335 0.056 0.0003 N/A 0.126 N/A 100 6-9
Total Total Total Total Total Total Total Total Total Total Total Total Total Total Total
Monitoring Sample Rainfall Antimony Arsenic Beryllium Boron Cadmium Chromium Copper Lead Nickel Selenium Silver Thallium Zinc Mercury TSS pH
Period Date inches mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L ng/L mg/L S.U.
Y1P1/1/Q1 No Flow
Y1P1/1/Q2 No Flow
Y1P2/2/Q1 03/10/17 1 0.24 <0.005 <0.01 <0.001 1
<0.05 <0.001 <0.005 <0.005 <0.005 1 <0.005 <0.01 <0.005 <0.001 0.011 5.78 5.6 6.4
Y1P2/2/Q2 No Flow - - - - - - - - - - - - - - - - -
Y2P1/3/Q1 08/31/17 1.24 <0.005 <0.01 0.00017J <0.05 <0.001 <0.005 0.007 <0.005 0.0028.1 <0.01 <0.0005 0.000097.1 0.030 2.90 31.4 7.1
Y2P1/3/Q2 No Flow - - - - - - - - - - - - - - - - -
Y2P2/4/Q1 01/11/18 2.10 <0.001 <0.001 <0.001 <0.05 <0.001 0.00120 0.00378 <0.001 0.00130 <0.001 <0.0003 <0.0002 0.014 8.80 32 6.5
Y2P2/4/Q2 04/23/18 0.71 <0.001 0.0044 <0.001 <0.05 <0.001 0.0069 0.010 0.0036 0.0049 <0.001 <0.0003 <0.0002 0.068 13.10 87 7.4
Y3P1/5/Q1* 09/26/18 0.64 <0.001 0.00332 <0.001 <0.05 <0.001 0.00846 0.010 0.00390 0.00559 <0.001 <0.0002 <0.0002 0.103 9.77 200 6.4
Y3P1/5/Q2* 10/26/18 1.63 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 0.00431 <0.001 0.00125 <0.001 <0.0002 <0.0002 0.012 8.77 18 6.8
Y3P1/5/Q2* 11/09/18 0.45 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 0.0587 <0.001 <0.001 <0.001 <0.0002 <0.0002 0.012 4.28 7.8 7.2
Y3P1/5/Q2* 12/20/18 1.06 <0.001 0.00392 <0.001 <0.05 <0.001 0.00492 0.00997 0.00307 0.00340 <0.001 <0.0002 <0.0002 0.051 14.2 86 7.2
Y3P2/6/Q1* No Flow - - - - - - - - - - - - - - - - -
Y3P2/6/Q2* 04/05/19 0.31 <0.001 0.00129 <0.001 <0.05 <0.001 0.00116 0.00578 <0.001 <0.001 <0.001 <0.0002 <0.0002 0.014 8.15 21 7.1
Y3P2/6/Q2* 06/07/19 1.11 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 0.00970 <0.001 0.00137 <0.001 <0.0002 <0.0002 0.008 8.20 12 7.2
Y4P1/7/Q1 No Flow - - - - - - - - - - - - - - - - -
Y4P1/7/Q2 10/30/19 1.52 <0.001 0.00125 <0.001 <0.05 <0.001 <0.001 0.00306 <0.001 0.00110 <0.001 <0.0002 <0.0002 0.020 8.08 9 6.8
Y4P2/8/Q1 03/23/20 0.50 <0.001 0.00147 <0.001 <0.05 <0.001 0.00247 0.00434 0.00167 0.00213 <0.001 <0.0002 0.000491 0.033 7.28 24 6.95
Y4P2/8/Q2 04/23/20 1.01 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 0.00754 <0.001 0.00163 <0.001 <0.0002 <0.0002 0.013 9.64 5.8 6.84
Y5P1/9/Q1 09/29/20 0.92 <0.001 <0.001 <0.001 <0.05 <0.001 0.00178 0.005 0.00107 0.0023 <0.001 <0.0002 <0.0002 0.015 8.43 12 6.85
Y5P1/9/Q2 10/28/20 1.29 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 0.00420 <0.001 0.00130 <0.001 <0.0002 <0.0002 0.013 8.01 5.3 7.04
Y5P2/10/Q1 03/25/21 2.99 <0.001 <0.001 <0.001 <0.05 <0.001 0.00235 0.00320 0.00170 0.00212 <0.001 <0.0002 <0.0002 0.018 8.38 36 6.91
Y5P2/10/Q2 No Flow - - - - - - - - - -
Y6P1/11/Q1 No Flow - - - -
Y6P1/11/Q2 No Flow - - - - - - - - - - - - - - - - -
Y6P2/12/Ql 02/03/22 2.13 <0.001 <0.001 <0.001 <0.05 <0.001 r <0.001 0.00354 <0.001 0.00123 <0.001 <0.0003 <0.0002 0.009 8.56 22 7.14
Notes:
*Tiered Sampling (Tier One):
TSS 09/26/18 - 12/20/18
• Copper 11/09/18 - 06/07/19
1. Monitoring Period = Year#Period#/Sample#/Quarter#
2. TBD = to be determined (results not available)
3. TSS = total suspended solids
4. 3 = Laboratory data qualifier indicating estimated concentration above the laboratory method detection limit and below the laboratory reporting limit.

SWO09 - Analytical Monitoring Results - In service 12/01/2020 semi-annual
Sample
Freq. SDOMR Parameter
Quarterly Code: 01097 01002 01012 01022 01027 01034 01042 01051 01067 01147 01077 01059 01092 71900 00530 00400
Benchmark Values(mg/L): 0.09 0.34 0.065 N/A 0.003 0.9 0.010 0.075 0.335 0.056 0.0003 N/A 0.126 N/A 100 6-9
Total Total Total Total Total Total Total Total Total Total Total Total Total Total Total
Monitoring Sample Rainfall Antimony Arsenic Beryllium Boron Cadmium Chromium Copper Lead Nickel Selenium Silver Thallium Zinc Mercury TSS pH
Period Date inches mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L ng/L mg/L S.U.
Y5P1/9 No Flow — — — — — — — — — — — — — — — — —
Y5132/10 3/16/21 0.74 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 0.00268 <0.001 0.01270 <0.001 <0.0002 <0.0002 0.057 3.08 16 6.05
Y6P1/11 No Flow — — — — — — — — — — — — — — — — —
Y6P2/12 02/03/22 2.13 <0.001 <0.001 <0.001 <0.05 <0.001 0.00108 0.00330 <0.001 0.00446 1 <0.001 <0.0003 <0.0002 0.038 3.31 16 7.15

SWO10 - Analytical Monitoring Results - In service 12/01/2020 semi-annual
Sample
Freq. SDOMR Parameter
Quarterly Code: 01097 01002 01012 01022 01027 01034 01042 01051 01067 01147 01077 01059 01092 71900 00530 00400
Benchmark Values(mg/L): 0.09 0.34 0.065 N/A 0.003 0.9 0.010 0.075 0.335 0.056 0.0003 N/A 0.126 N/A 100 6-9
Total Total Total Total Total Total Total Total Total Total Total Total Total Total Total
Monitoring Sample Rainfall Antimony Arsenic Beryllium Boron Cadmium Chromium Copper Lead Nickel Selenium Silver Thallium Zinc Mercury TSS pH
Period Date inches mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L ng/L mg/L S.U.
Y5P1/9 No Flow — — — — — — — — — — — — — — — — —
Y5P2/10 3/16/21 0.74 <0.001 <0.001 <0.001 <0.05 <0.001 0.00113 0.00209 <0.001 0.00103 <0.001 <0.0002 <0.0002 0.067 3.48 13 7.36
Y6131/11 No Flow — — — — — — — — — — — — — — —
Y6P2/12 1 02/03/22 1 2.13 1 <0.001 i <0.001 i <0.001 i <0.05 i <0.001 i 0.00117 1 0.00257 0.00120 0.00115 1 <0.001 1 <0.0003 1 <0.0002 1 0.052 3.12 16 i 7.37

SWO11 - Analytical Monitoring Results- In service 4/1/2021 quarterly
Sample
Freq. SDOMR Parameter
Quarterly Code: 01097 01002 01012 01022 01027 01034 01042 01051 01067 01147 01077 01059 01092 71900 00530 00400
Benchmark Values(mg/L): 0.09 0.34 0.065 N/A 0.003 0.9 0.010 0.075 0.335 0.056 0.0003 N/A 0.126 N/A 100 6-9
Total Total Total Total Total Total Total Total Total Total Total Total Total Total Total
Monitoring Sample Rainfall Antimony Arsenic Beryllium Boron Cadmium Chromium Copper Lead Nickel Selenium Silver Thallium Zinc Mercury TSS pH
Period Date inches mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L ng/L mg/L S.U.
Y5P2/10/Q2 07/26/21 0.04 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 <0.002 <0.001 <0.001 <0.001 <0.0003 <0.0002 <0.005 0.716 3.1 7.75
Y6P1/11/Q1 10/28/21 0.26 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 <0.002 <0.001 <0.001 <0.001 <0.0003 <0.0002 <0.005 0.796 3.2 8.90
Y6P1/11/Q2 02/03/22 2.13 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 <0.002 <0.001 <0.001 <0.001 <0.0003 <0.0002 <0.005 1.06 4.7 7.53
Y6P2/12/Q1 04/04/22 1 0.64 1 <0.001 i 0.00364 1 <0.001 1 <0.05 1 <0.001 1 0.00116 1 0.00237 <0.001 <0.001 1 0.00545 1 <0.0003 1 <0.0002 i <0.005 i 3.00 13 i 7.09

SWO12 - Analytical Monitoring Results - In service 4/1/2021 quarterly
Sample
Freq. SDOMR Parameter
Quarterly Code: 01097 01002 01012 01022 01027 01034 01042 01051 01067 01147 01077 01059 01092 71900 00530 00400
Benchmark Values(mg/L): 0.09 0.34 0.065 N/A 0.003 0.9 0.010 0.075 0.335 0.056 0.0003 N/A 0.126 N/A 100 6-9
Total Total Total Total Total Total Total Total Total Total Total Total Total Total Total
Monitoring Sample Rainfall Antimony Arsenic Beryllium Boron Cadmium Chromium Copper Lead Nickel Selenium Silver Thallium Zinc Mercury TSS pH
Period Date inches mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L ng/L mg/L S.U.
Y5P2/10/Q2 07/26/21 0.04 <0.001 <0.001 <0.001 <0.05 <0.001 0.00176 0.00272 <0.001 <0.001 <0.001 <0.0003 <0.0002 0.011 1.94 28.4 7.59
0.00029
Y6P1/11/Q1 10/28/21 0.26 <0.001 0.00102 <0.001 <0.05 <0.001 <0.001 0.00207 <0.001 <0.001 <0.001 <0.0003 2 0.005 <0.50 3.5 7.80
Y6P1/11/Q2 02/17/22 0.73 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 0.00208 <0.001 <0.001 <0.001 <0.0003 <0.0002 <0.005 1.99 12 8.36
Y6P2/12/Ql i 06/07/22 i 0.15 1 <0.001 1 0.00150 1 <0.001 1 <0.05 1 <0.001 1 0.00125 1 0.00238 <0.001 0.00101 1 <0.001 <0.0003 <0.0002 0.010 i 1.81 5.3 7.07

Antonio D. Price,PE
f DUKE Plant General Mangei
ENERGY Asheville Combined Cycle Station
Duke Energy Progress
October 28, 2020 ASVL PLT 1 46 Duke Energy Lane
Arden, NC 28704
o.828-650-0620
Suzanne McCoy f 828-650-0701
NCDEMLR Stormwater Program [e-mail]
1612 Mail Service Center
Raleigh, North Carolina 27699-1612
Subject: Asheville Steam Electric Station dba Asheville Combined Cycle Station
Industrial Stormwater Permit No. NCS000575
Permit Renewal Application
Dear Ms. McCoy:
Duke Energy Progress, LLC requests the subject permit be renewed and reissued. The subject permit
expires on April 30, 2021. Section III Part B of this permit requires the permit application for permit
renewal to be submitted at least 180 days prior to the expiration date of the permit. Attached are two
copies of the complete renewal application.
In the current permit there are several outfalls that it is requested to be removed from the permit for the
reasons as noted: a. SWO01 does not discharge and b. SW007, SWO08 and SW013 were never built.
Should you have questions or need additional information please contact Robert Wylie at 704-562-8258
or robert.wylie(cDduke-energy.com .
Sincerely,
RECEIVED
Antonio D. Price, PE, General Manager Il NOV 0 4 7020
Asheville Combined Cycle Station DENR-LAND QUALITY
STORMWATER PERMITTING
Enclosures:
Industrial Stormwater Permit NCS000575 Renewal Application
Tab 1 Renewal Application Form
Tab 2 Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
Tab 3 Site Maps
Tab 4 Summary of Analytical Monitoring
Tab 5 Summary of Visual Monitoring
Tab 6 Outfall Narrative and Summary of BMPs
Tab 7 Narrative of Facility Changes
Tab 8 Certification of the Development and Implementation of a Stormwater Pollution
Prevention Plan for the Permitted Facility
Tab 9 Fish Tissue Monitoring Results for the French Broad River 2017-2019
Cc: Robert Wylie
Teresa Williams
www.duke-energy.corm

DUKE
.� ENERGY.
Asheville Combined Cycle Station
Industrial Stormwater Permit NCS000575
Renewal Application
. ILL-
EVE
October 2020
Prepared by:
Anchor QEA of North Carolina, PLLC I _ ?, ANCHOR
231 Haywood Street V/,'�'
Asheville. North Carolina QEA

TABLE OF CONTENTS
1 RENEWAL APPLICATION FORM
2 SUPPLEMENTAL INFORMATION REQUIRED FOR
RENEWAL OF INDIVIDUAL NPDES STORMWATER
PERMIT
3 SITE MAPS
3.1 Overall Site Map
3.2 Back Haul Road Area
3.3 Combined Cycle Station Area
3.4 Landfill Area
4 SUMMARY OF ANALYTICAL MONITORING
5 SUMMARY OF VISUAL MONITORING
6 OUTFALL NARRATIVE AND SUMMARY OF BMPS
6.1 Back Haul Road Area
6.2 Combined Cycle Station Area
6.3 Landfill Area
7 NARRATIVE OF FACILITY CHANGES
7.1 Back Haul Road Area
7.2 South Haul Road to New Rockwood Road (Not Constructed)
7.3 Combined Cycle Station
7.4 Landfill Area
8 CERTIFICATION OF THE DEVELOPMENT AND
IMPLEMENTATION OF A STORMWATER POLLUTION
PREVENTION PLAN FOR THE PERMITTED FACILITY .
9 FISH TISSUE MONITORING REPORTS IN THE FRENCH
BROAD RIVER 2017 - 2019
h I ' age

I RENEWAL APPLICATION FORM

Permit Coverage
Renewal Application Form
National Pollutant Discharge Elimination System NPDES Permit Number
Stormwater Individual Permit NCS 00D575
Please provide your permit number in box in the upper right hand corner, complete the information in the space provided
below and return the completed renewal form along with the required supplemental information to the address indicated.
Owner Information *- Address to which permit correspondence will be mailed
Owner/Organization Name: Duke Energy Progress,LLC
Owner Contact: Paul Drsovltch
Mailing Address: 526 Sculh Church Street
Charlotte,NC 28202
Phone Number: 980-373-0408
Fax Number:
E-mail address: [e-mail]
Facility Information
Facility Name: Asheville Steam Electric Station dba Asheville Combined Cycle Station
Facility Physical Address: 46 Duke Energy Lane
Arden,NC 28704
Facility Contact: Antonio D.Price,PE
Mailing Address: 46 Duke Energy Lane
Al NC 26704
Phone Number: 828-650-0620
Fax Number: 828-650.0701
E-mail address: [e-mail]
Permit Information
Permit Contact: Robert Wylie
Mailing Address: 526 South Church Street
Charlotte,NC 282D2
Phone Number: 704 562-8258
Fax Number:
E-mail address: [e-mail]
Discharge Information
Receiving Stream: Lake Julian and French Broad River
Stream Class: C and B
Basin: French Broad
Sub-Basin: Upper French Broad(04-03-02)
Number of Outfalls: 6
Facility/Activity Changes Please describe below any changes to your facility or activities since issuance of your permit. Attached a
separate sheet if necessary.
Facility/Activity Changes are summarized in the attached Industrial Stormwater Permit NCS000575 Renewal Application supplemental information document.
CERTIFICATION
I certify that I am familiar with the information contained in the application and that to the best of my knowledge and belief
such information is true, conn!�7ae
e and accurate.
SignatureDate s y ru
Antonio D.Price,P.E. Station General Manager II
Print or type name of person signing above Title
DEMLR - Stormwater Program
Please return this completed application form Dept. of Environmental Quality
and requested supplemental information to: 1612 Mail Service Center
Raleigh, North Carolina 27699-1612

/0001
2 SUPPLEMENTAL INFORMATION REQUIRED FOR RENEWAL OF
INDIVIDUAL NPDES STORMWATER PERMIT

SUPPLEMENTAL INFORMATION REQUIRED FOR RENEWAL OF INDIVIDUAL
NPDES STORMWATER PERMIT
Two copies of each of the following shall accompany this submittal in order for the
application to be considered complete:
(Do = submit the site Stormwater Pollution Prevention Plan)
Initials
TLW
1. A current Site Map from the Stormwater Pollution Prevention Plan. The
location of industrial activities (including storage of materials, disposal
areas, process areas and loading and unloading areas), drainage
structures, drainage areas for each outfall, building locations and
impervious surfaces should be clearly noted. (Tab 3)
TLW 2. A summary of Analytical Monitoring results during the term of the
existing permit (if your permit required analytical sampling). Do not
submit individual lab reports. The summary can consist of a table
including such items as outfall number, parameters sampled, lab
results, date sampled, and storm event data. (Tab 4)
TLW 3. A summary of the Visual Monitoring results. Do not submit individual
monitoring reports. The summary can consist of a table including such
items as outfall number, parameters surveyed, observations, and date
monitoring conducted. (Tab 5)
TLW 4. A summary of the Best Management Practices utilized at the permitted
facility.
Summary should consist of a short narrative description of each BMP's
in place at the facility. If the implementation of any BMP's is planned,
please include information on these BMP's. (Tab 6)
TLW 5. A short narrative describing any significant changes in industrial
activities at the permitted facility. Significant changes could include the
addition or deletion of work processes, changes in material handling
practices, changes in material storage practices, and/or changes in the
raw materials used by the facility. (Tab 7)
TLW 6. Certification of the development and implementation of a Stormwater
Pollution Prevention Plan for the permitted facility (Sign and return
attached form). (Tab 8)
If the final year analytical monitoring of the existing permit term has not been completed
prior to filing the renewal submittal, then the last years monitoring results should be
submitted within 30 days of receipt of the laboratory reports. (i.e. do not withhold renewal
submittal waiting on lab results)

3 SITE MAPS
3.1 OVERALL SITE MAP
3.2 BACK HAUL ROAD AREA
3.3 COMBINED CYCLE STATION AREA
3.4 LANDFILL AREA

Structural Legend
SWO12 1 Power Block 1
2 Power Block 2
3 Unit 6 Cooling Tower
4 Unit 8 Cooling Tower
5 Water Treatment Building
Swo11 6 Administrative Building_
NPDES 7 Warehouse
Outfall 001 A
r- r\\O' 8 Laydown Yard
9 Unit 5 and 6 Transmission Switchya
r � � ! 10 Unit 7 and 8 Transmission Switchya
t' S W012- 11 1,250,000 gallon fuel oil storage to
Ctrainago ,a Future ` ara ° 12 1,804,000 gallon fuel oil storage to
Landfill23 13 1,804,000 gallon fuel oil storage to
♦ 14 Former Coal Pile
® *' 15
1.
Y � � '64 Ash Basin
y �
-r'� ze 16 Lined Retention Basin
x f; a a! ❑
,l� - � � �� 17 NPDES Water Treatment System _
.... ,. r�` •! Outfall 001 Stilling Pond
24
c. SW012 lary5rsey 20 �. 22 ♦ �, _ 18
F : .
• , , 19 Landfill Leachate Collection Tank
18 Drainage`_� ! �` 20 230 kV Switchyard
19 e
Distribe
Area , l- switchyard Coal Unit t c r. '` 25 `27 21 FGD Scrubber Demolition Area
) �.�. p! `
22 Coal Unit
riit f
23 CT Unit 3 1
ern liti Aiea"
,ems and Unit 2 Demolition
25 CT Unit 4
CT Demineralized Water Storage Tank
21 � 26 Laydown Yard
27 CT Warehouse _
Outfall 002
,,,r 14 28 Intake.-. -.—
29 % 29 Former Once-Through Cooling Wat
30 Oil/Water Separator
10
s - - 1 �.t, ,' !!!!!!!-!!a! �' �d•J.R:i.�= - y;. I11 i12
30 _
4 $tkw
� v
2133
r 10 j 9
�.. .
x '
NPDES NPDES 3 �•� - + � i
Outfall 101 Outfall
3
a 001E PDES SW" 110 2. �yA"�'I,7.• ' ' f'' a.....r �i' � ;{ Yro,: x•3 �I -.
,
r
N
Outfall001 D 4 yAre,sle
2030
r I
xa!'
_ 9
o ,
,., _ s
u. ... � S.r '��'�I� • ° N
51N003
so >oo CCJ NPDES SW009
Draina e
Area
DB
SWO09 _ NPDES
DB Outfall ' 'Y,
DB
DB 001C
3 y
A N 21
4 .s
Publish Date: 2020/10/26, 1:55 PM User: alesueur
Filepath: \\orcas\gis\Jobs\Duke_Energy_1290\Asheville_Plant\Maps\2020_10_SW_PermitRenew I\AQDE_Asheville_Fig01_SiteMap.mxd
ANCHOR
QEA

rFormerStormwater Outfall SWO01
Lake Julian
- Z9tZ *911 Est Stormwater Outfall SWO
tgVz
f _-----_ _ 991691Z99tZ9g�a_
0
2174
10
1-7
1
_ = = Ma
Jim
_ • 1-os��-_____ —_ a _
�61 _ ------ — —f
r
\
ae tZ
A _ _ $
_ o ion Detent Basin
____ `._---- — Detention Basin
o— toZZ —
_
961Z ZsIZ
o2198
tiotiti ovv �" ���\ god
90?? \
J
-- ♦ ♦� •
/r
to
fAva
1
tZZ -
2204
f p �
, .0e --------_
n 2.196
—
SOURCE: Drawings provided by Jacobs Engineering dated May 18, 2000 LEGEND: DRAINAGE AREA W003:
and Chicago Bridge & Iron Company (CB&I) dated April 21, 2017. Topography (2' Interval)
HORIZONTAL DATUM: North Carolina State Plane, North American - - - - � - - Drainage Area Boundary Total Drainage Area: 8.92 acres
Datum of 1983 (NAD83), U.S. Survey Feet Drainage Flow Direction Impervious Drainage Area: 1 .42 acres
VERTICAL DATUM: North American Vertical Datum of 1988 (NAVD88)
— — Property Line
NOTE: See Stormwater Best Management Practices (BMP) described in the Surface Water
Stormwater Permit Renewal Application. • ■ BMPs (e.g. Wattles and FlocTI SOCS)
Publish Date: 2020/10/23 4:23 PM I User: dholmer
Filepath: K:\Projects\1290-Duke Energy\Duke - SPPP Update\1290-SPRA-001.dwg Figure 2
ANCHOR
QEA

IV IV
\ 1\ \ LEGEND:
\ \\ \ �\ / i► � i � •• \ \ � �` � - - - - - - - - Topography (10' Interval)
\ 1
\ \_ «!\ Po� �� e ♦ I \\ Drainage Area Boundary
Drainage Flow Direction
\ ® --- _ _ / ♦ \• �_ - - P -operty Line
/''2160 I ee "' -->fl J `� � ♦ ' �f / \ \► \ _ Surface Water
or � ------- ------- --- • Wetland Boundary
\ ` \ _ --//' \\
- Julian
! �! III F-C \ ♦ \\ \ \ \ o 1AH-Ulu
_ \\ \\ �/ /sue \, \ \ Stormwater Drop Inlet
e� \
p\`� _ 1 \ » Stormwater Drain Line
MH49 - MH A4 - MH-A3 [VU 1 )2 —pMl I-D4 Mf l I \ ` I \ .` �. N. \ • \ NEW
3 BIAPs (e.g. Check Dams and
f�1H 6 \ I I \�\\\\�O\ \ I FlocT"" Socs)
MH D7
MH-A7 D1 �MH_p13
1 v \\ \ \ 1 \ \
L— - - 1 SW009 Drainage Area -
/ / I �
~ ��— _ 1 —��--- -= I I I �.,. I III 1 �\ \
/ ♦► I I II MIT i � IT i a � \\ \ ® DRAINAGE ARIEA SWO09:
\ IT
/! I ! I� I i 1 MH-D9��-- IMH-�A 1 , j N I !I I `\ \ \ Total Drainage Area: 61 .24 acres
/ I MH-A10 1 i J 1 P --L
It
IL �� iUn
/ / i j 1 ♦ ° \\\\� I Impervious Drainage Area: 12 acres
If
t �MH-DIP I / ! ! 1 _ \ \ \ DRAINAGE ARIEA SW010:
SW010 Drainage Area i //`/ c I it , MH-C31 MH ¢3 E ii j / i I/
g / / r/ I I H-c2
/inn 1�t _ I Total Drainage Area: 31 .01 acres
of
MH-B4 «_ 1 MH D1 I / / ! f \ \
_ aH-D14 I s / / I -~� \ \ \ Impervious Drainage Area: 25 acres
MA4 I /
L-- 1 + MH-D� I / / / /e I \ \ `. \
MH C5 -MH ® H-6 _MH-U]z -- ) / / r
/// I /_1 I 11 MHCP7MHCP6 = = = iww Mhf�D18
1 1 HP9 / MH 9
II
�IH-CfI151 \ � MH C6 I � � 1 II x .3 ,� � .
\ �� / 1 i MH D20 / / / / / / / / I 0
/ / I / 1 1 . �� IN \\ t �22}-/- ♦ / I \
/Q \ \\ MH $11 „____•M , 1--� 1� /sH D21 //// // I ( \ \ \ \\ 1
// ( IMH ¢P18j `� ��0� ` IMH B9 1 MH D73 / //////// // / ` . // /b�� \ J�l� a,,
Z---
+ • C 1 / � MH-CP10 I \\ \�—_ D2a ♦` / / / I / / ` \\ !
"00, 4#01
-------
MH CP1 MH-CP1� ��, \�,�MH D2& � \ ` 1 \ \ �� . � \ ♦ \\\ �� \
t
Stormwater Outfall SW010 / ^ HGV-of-EB1 ,-, _ \\\ �\ _ �-. I ♦ \ \\
/ \.. t MH CP12� 113
0 e \ \ \ \ \ \ \ \ \\
, 4\ SOURCE: Drawings provided by VEETech P.C. and
40
// Stormwater Collection Basin ,�� � .� . / \ Catlin Engineers and ,scientists dated December 3,
/ \\ ! 1 `.� HW-OF-C '�e\ �/ y �— \ 1 d 1 1 \ I 2019.
­V` - / �/ A /� I a i HORIZONTAL DATUM: North Carolina State Plane,
\ I 1 \ ``h` �/ ` Stormwater Outfall SW: --`-� \ /� / / r—�
\ \ �2 \
2 1\•�'�` % / ,� -\ - � - // I ' L I _+ North American Datum of 1983 (NAD83), U.S. Survey
Feet
// �'..� `/ , �� \\� \ ° I s : North American Vertical Datum
. . . ��,N�� ,ram`` ; � � 5, VERTICAL DATUM
/ � �/ ( / ♦ I �.. � �� � � ♦ ® o ,I 1 v v ! of 1988 (NAVD88)
\ , / `r Collection Basin \ �.' ,��\ \ / Stormwater
I /
`� 21 I !I ��`; ' / ` ► --� N . � ~ 1 i NOTE: See stormwatE.r Best Management Practices
\ \ \ \ \ I I / \ e, 1
\ �-. r \ ,,� �/ r (BMP) described in the Stormwater Permit Renewal
N. `\ \ ti �
\ \ \ \ * Application.
100,
\ \ \ If /
i—_\ Feet
Publish Date: 2020/10/23 4:23 PM User: dholmer
Filepath: K:\Projects\1290-Duke Energy\Duke - SPPP Update\1290-SPRA-002.dwg Figure 3
ANCHOR. Figure 3
Combined Cycle Station Area Map
Stormwater Permit Renewal Application
Duke Energy Asheville Steam Electric Plant

ay tint I \�'� \�`�\ v'
� � � t 1/ f / / y � 1 / t � \ td 1 d e �, _ �...®�\ \. 1 `. •`.. a\ \�.� ` -----`_ \
e Stormwater Collection Basin ' \
—
��— " � `sue \1 \ -"— J. . .. . . ..°��\ '
•`°•I �` '\s---aa1 r/Jf �rI'il.. — �P •— � , /J/' `f .f- r ,/_ / ..,. °f/ 1 / J/ J
13
If
Stormwater Clutfall SWO12 - ^� >' I / 1 E
! I 1 1 r \® .
l > Stormwater 0utfall SW011 /
A \ \ .
• \\\\\ \fin" `Lt j.. fJ 4 ~ \\I I I I ( \ / \\ \ \ t�E
\ ex \ \ , a I I I I\ E
�0 \ I \\\\
7 \ \ \ \ \ C y t \\
of
\\ \ ® - -' 20 Stormwater Collection
SW012 Drainage Area
/ ® / / I ,c� J SW011 Drains
\
l \
\ \1 \\ \ I \\
1 \ \
I \�t \ tj; \ \ �\ \� \ � I I \\ \ •.; \\ \ < Landfill Footprint
(Non-ContributingArea I '\ —
� \ —
\ + Proposed SW013, Not -
1 Constructed. Haul Road
i I \
1\ Directed to SW012
�� I I EE \ \
E E
i Perimeter Access Road
I
Y \ l; � '/ram /✓/ \\ \\ `\-''� \ \ \\ \\ \\ ` --- -- / / / �g / � /
\ \\ I \\\1 \ ^� ` 't - - - ---- - ----------
v
\ t\ \ ! N\L_ ter. - ... :1 J D �i %�t - '� `�� d �, —���— � Maintenance Roads
OHE
E E / ot+E - ---} OHE \ /� . .. EE d ❑
\ J� 1 E J� .. . .� `..� E ❑
12" or 18" Pipe < < ....\' � �' E _ . E ! �
\\ t 41
1 ' t -� It11: Ilt ►1 / ate s'�_--_--- i Haul Road E
---- -_ l ... E � /
s \ \\\\I r5�' — / ► 1 l / /J Sediment Basin
\\\\ \\ \\ 1 — — Temporary Diversion _
,---- — — — --
\\\�\1\\\\\`\\ SW012 Drainage Area
\
\\\\1'1\\ 1 �\\ `\e� i r. \ \•,C (/ Jam.�
\1\\l l�\` \ '�Y e 1�-•\' •
Publish Date: 2020/10/23 4:23 PM I User: dholmer
Filepath: K:\Projects\l290-Duke Energy\Duke - SPPP Update\1290-SPRA-003.dwg Figure 4
4
ANCHOR
QEA

4 SUMMARY OF ANALYTICAL MONITORING

l
SWO03 - Analytical Monitoring Results
Sample
Freq. SDOMR Parameter
Quarter) Code: 01097 01002 01012 01022 01027 01034 01042 '- : 01051 01067 01147 01077 01059 01092 71900 00530 00400
Benchmark Values(mg/L): 0.09 0.34 0.065 ." ;N/A 0.003 0.9 0.010 - 0.075 0.335 0.056 0.0003 N/A 0.126 N/A 100 6-9
Total Total Total Total Total Total Total Total Total Total Total Total Total Total Total
Monitoring Sample Rainfall Antimony Arsenic Beryllium Boron Cadmium Chromium Copper Lead Nickel Selenium silver Thalllum Zinc I Mercury TSS pH
Period Date inches mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L ng/L mg/L S.U.
Y1P1/1/Q1 No Flow - - - - - - - - - - - - - - - - -
Y1P1/l/Q2 No Flow - - - - - - - - - - - - - - - - -
Y1P2/2/Ql 03/10/17 0.24 <0.005 <0.01 <0.001 <0.05 <0.001 <0.005 <0.005 <0.005 <0.005 <0.01 <0.005 <0.001 0.012 5.78 5.6 6.4
Y1P2/2/Q2 No Flow - - - - - - - - - - - - - - - - -
Y2P3/3/Ql 08/31/17 1.24 <0.005 <0.01 0.000171 <0.05 <0.001 <0.005 0.007 <0.005 0.00281 <0.01 <0.0005 0.0000971 0.030 2.90 31.4 7.1
Y2P1/3/Q2 No Flow - - - - - - - - - - - - - - - - -
Y2P2/4/Q1 01/11/18 2.10 <0.001 <0.001 <0.001 <0.05 <0.001 0.00120 0.00378 <0.001 0,00130 <0.001 <0.0003 <0.0002 0.014 8.80 32 6.5
Y2P2/4/Q2 04/23/18 0.71 <0.001 0.0044 <0.001 <0.05 <0.001 0.0069 0.010 0.0036 0.0049 <0.001 <0.0003 <0.0002 0.068 13.10 87 7.4
Y3P1/5/Ql* 09/26/18 0.64 <0.001 0.00332 <0.001 <0.05 <0.001 0.00846 0.010 0.00390 0.005S9 <0.001 <0.0002 <0.0002 1 0.103 9.77 200 6.4
Y3P1/5/Q2* 10/26/18 1.63 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 0.00431 <0.001 0.00125 <0.001 <0.0002 <0.0002 0.012 8.77 18 6.8
Y3P1/5/Q2* 11/09/18 0.45 <0.001 <0.001 <0.001 <0.05 <0.001 <0.001 0.0587 <0.001 <0.001 <0.001 <0.0002 <0.0002 0.012 4.28 7.8 7.2
Y3P1/5/Q2* 12/20/18 1.06 <0.001 0.00392 <0.001 <0.05 <0.001 0.00492 0.00997 0.00307 0.00340 <0.001 <0.0002 <0.0002 0.051 14.2 86 7.2
Y3P2/6/Q1* No Flow - - - - - - - - - - - - - - - - -
Y3P2/6/Q2* 04/05/19 0.31 <0.001 0.DO129 <0.001 <0.05 <0.001 0.00116 0.00578 <0.001 <0.001 <0.001 <0.0002 <0.0002 0.014 8.15 21 7.1
Y3P2/6/Q2* 06/07/19 1.11 <0.001 I <0.001 <0.001 1 <0.05 <0.001 <0.001 0.00970 <0.001 0.00137 <0.001 <0.0002 <0.0002 0.008 8.20 12 7.2
Y4P1/7/Ql No Flow - - I - - - - - - - - I - - - - - - -
Y4P1/7/Q2 10/30/19 1.52 <0.001 0.00125 <0.001 <0.05 <0.001 <0.001 0.00306 <0.001 0.00110 <0.001 <0.0002 <0.0002 0.020 8.08 9 6.8
Y4P2/8/Ql 03/23/20 O.SO <0.001 0.00147 <0.001 <0.05 <0.001 0.00247 0.00434 0.00167 0.00213 <0.001 <0.0002 0.000491 0.033 7.28 24 6.95
Y4P2/8/Q2 04/23/20 1.01 <0.001 <0.001 <0.001 <0.05 1 <0.001 <0.001 0.00754 <0.001 0.00163 <0.001 <0.0002 <0.0002 0.013 9.64 5.8 6.84
Y5P1/9/Ql 09/29/20 0.92 <0.001 <0.001 <0.001 <0.05 <0.001 0.00178 0.005 0.00107 0.0023 <0.001 <0.0002 <0.0002 0.015 8.43 12 6.85
YSP1/9/Q2 TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD
YSP2/10/Q1 TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD I TBD I TBD I TBD TBD TBD TBD TBD
Notes:
*Tiered Sampling (Tier One):
• TSS 09/26/18 - 12/20/18
• Copper 11/09/18 - 06/07/19
1. Monitoring Period = Yea r#Period#/Sample#/Quarter#
2. TBD = to be determined (results not available)
3. TSS = total suspended solids
4. 3 = Laboratory data qualifier indicating estimated concentration above the laboratory method detection limit and below the laboratory reporting limit.

SWO02
No Flow for all periods; removed from permit May 3, 2017.
SWoo1
No Flow for all periods; requesting removal.
SWO07 and SW008
Never constructed, requesting removal.
SWO13
Never constructed, requesting removal.

r"511\
5 SUMMARY OF VISUAL MONITORING
ram,
14�

Summary of Visual (Qualitative) Monitoring
Visual (qualitative) results descriptions:
• Clarity = 1 through 5, where 1 is clear and 5 is very cloudy.
• Floating Solids = 1 through 5, where 1 is no solids and 5 is the surface covered with floating solids.
• Suspended Solids = 1 through 5, where 1 is no solids and 5 is extremely muddy.
SWO03 - Visual (Qualitative) Monitoring Results
Floating Suspended Visible Indication of
Date Rainfall Color Odor Clarity Solids Solids 106am Oil Sheen Erosion Comments
11/29/16 0.70 Clear None 1 1 1 No No No None
03/10/17 0.24 Clear None 1 1 1 No No No None
No measurable storm
events during
operational hours for
06/30/17 0.00 N/A N/A N/A N/A N/A N/A N/A N/A this monitoring period
08/31/17 1.24 Clear None 1 1 1 No No No None
10/23/17 3.33 Clear None 1 1 1 No No No None
01/11/18 2.10 Light brown None 2 2 2 No No No None
04/23/18 0.71 Light brown None 2 1 2 No No No None
09/26/18 0.64 Light brown None 3 1 2 No No No None
10/26/18 1.63 Light brown None 2 1 2 No No No None
11/09/18 0.45 Light brown None 2 1 2 No No No None
12/20/18 1.06 Light brown None 3 1 2 No No No None
02/22/19 0.78 Light brown None 2 1 2 No No No None
04/05/19 0.31 Light brown None 1 2 1 2 No No No None
06/07/19 1.11 Light brown None 2 1 2 No No No None
10/30/19 1.52 Light brown None 2 1 2 No No No None
03/23/20 0.50 Light brown None 2 1 1 No No No None
04/23/20 1.01 Light brown None 2 1 1 1 No No No None
09/29/20 0.92 Light brown None 2 1 1 2 No No No None
Notes:
1. N/A indicates not applicable (i.e. no stormwater discharge).

SW001 - Visual (Qualitative) Monitoring Results
Floating Suspended Visible Indication of
Date Rainfall Color Odor Clarity Solids Solids Foam Oil Sheen Erosion Comments
Light red
11/29/16 0.70 (natural clay) None 2 1 2 No No No No discharge
03/10/17 0.24 N/A None N/A N/A N/A No No No No discharge
No measurable storm
events during
operational hours for
06/30/17 0.00 N/A N/A N/A N/A N/A N/A N/A N/A this monitoring period
Ponding at the
pipe light brown
from
08/31/17 1.24 surrounding soil None 2 1 2 No No No No discharge
Ponding at the
pipe vegetation
overgrown slight Ponding at pipe,
turbidity from discernable discharge
10/23/17 3.33 surrounding soil None 2 1 2 No No No path not evident
Very small amount of
ponding at pipe, but no
01/11/18 2.10 Very light brown None 2 1 2 No No No discharge to lake
Very small amount of
ponding at pipe,but no
04/23/18 0.71 Very light brown None 2 1 2 No No No discharge to lake
Very small amount of
ponding at pipe,but no
09/26/18 0.64 Very light brown None 2 1 2 No No No discharge to lake
Very small amount of
ponding at pipe,but no
10/26/18 1.63 Very light brown None 2 1 2 No No No discharge to lake
No water ponding at
pipe observed and no
11/09/18 0.45 N/A None N/A N/A N/A No No No discharge to lake
Very small amount of
ponding at pipe,but no
12/20/18 1.06 Very light brown None 2 1 2 No No No discharge to lake

Floating Suspended Visible Indication of
Date Rainfall Color Odor Clarity Solids Solids Foam Oil Sheen Erosion Comments
Very small amount of
ponding at pipe,but no
02/22/19 0.78 Very light brown None 2 1 2 No No No discharge to lake
No water ponding at
pipe observed and no
04/05/19 0.31 N/A None N/A N/A N/A No No No discharge to lake
No water ponding at
pipe observed and no
06/07/19 1.11 N/A None N/A N/A N/A No No No discharge to lake
Very small amount of
ponding at pipe,but no
10/30/19 1.52 Very light brown None 2 1 2 No No No discharge to lake
Small amount of
ponding at pipe,but no
03/23/20 0.50 Very light brown None 2 1 1 No No No discharge to lake
04/23/20* 1.01 N/A N/A N/A N/A N/A N/A N/A N/A No discharge
09/29/20* 0.92 N/A N/A N/A N/A N/A N/A N/A N/A No discharge
Notes:
1. N/A indicates not applicable (i.e. no stormwater discharge).
2. SW001 visual (qualitative) monitoring results are associated with ponding observed at the end of a pipe culvert, near the edge of Lake Julian (SW001), and
are not associated with observations of an actual discharge from SW001. There was no actual discharge from SW001 during the stormwater permit
monitoring period.
3. *The stormwater outfall SW001 drainage and discharge area was modified in April 2020 to where no industrial stormwater runoff flowed to or discharged
from SW001. See Tab 7 for a short narrative describing changes to the SW001 drainage area made in 2020.

6 OUTFALL NARRATIVE AND SUMMARY OF BMPs
6.1 BACK HAUL ROAD AREA
OUTFALL ID: SWO03
Discharge Structure: Concrete piping and riprap-lined ditch to Lake Julian
Location: Back Haul Road
Drainage Area: 8.92 acres
Percent Impervious: 15.92%
BMP Summary for SWO03 Drainage Area
INDUSTRIAL ACTIVITIES POTENTIAL BMP SUMMARY
AND DESCRIPTION POLLUTANTS
Material Handling (ash) Fugitive dust settling in Dust suppression with
drainage area water/polymer
Good housekeeping
Residue Hauling Vehicles Tracking of coal Covering trucks
combustion residuals Truck wash
(CCR) products onto Manually spraying tires and
roadway drainage area checking trucks before leaving site
Street sweeping
Leaking of petroleum from Petroleum into Security inspecting trucks for
deliver haul truck stormwater outfalls leaks reporting any drips ors ills
Erosion caused by truck Sediment into Preventative maintenance on
traffic or weather stormwater shoulders, erosion wattles,
matting, and floc socs.
Landscape and herbicide Sediment into Cut grasses at higher level to
management stormwater encourage healthy growth.
Prohibit use of herbicides in
stormwater areas to prevent
erosion from lack of vegetation.

,,010\
OUTFALL ID: SW001
Discharge Structure: Not applicable
Location: Back Haul Road
Drainage Area: Not applicable
Percent Impervious: Not applicable
Stormwater discharge outfall SWO01 no longer receives industrial stormwater runoff. See
Tab 7 for a short narrative describing changes to the SWO01 drainage area made in 2020.
BMP Summary for SWO01 Drainage Area
INDUSTRIAL ACTIVITIES POTENTIAL BMP SUMMARY
AND DESCRIPTION POLLUTANTS
Not applicable Not applicable Not applicable
,1AGN,
,?,M\

6.2 COMBINED CYCLE STATION AREA
OUTFALL ID: SWO09
Stormwater detention basin discharging through a corrugated
metal pipe (CMP) to a wetland area that discharges to the
Discharge Structure: French Broad River.
Location: Combined Cycle Station area
Drainage Area: 61.24 acres
Percent Impervious: 19.60%
OUTFALL ID: SW010
Stormwater detention basin discharging through a CMP to a
Discharge Structure: wetland area that discharges to the French Broad River.
Location: Combined Cycle Station area
Drainage Area: 31.01 acres
Percent Impervious: 80.62%
Planned BMP Summary for Combined Cycle Station Drainage Areas (Outfalls
SWO09 and SW010)
INDUSTRIAL ACTIVITIES POTENTIAL BMP SUMMARY
AND DESCRIPTION POLLUTANTS
Leaking of petroleum from Petroleum into Security inspecting trucks for
delivery trucks stormwater outfalls leaks reporting any drips ors ills
Fuel oil unloading areas Petroleum into Confine unloading activities to
stormwater outfalls designated areas outside drainage
pathways
Use containment curbs in
unloading areas
Use spill protection (e.g. drip pans
or buckets) beneath unloading
connections
Implement SPCC Plan and FRP
Chemical loading/unloading Chemical into Utilize secondary containment
areas stormwater outfalls structures and sumps for chemical
unloading operations
Use spill protection (e.g. drip pans
or buckets) beneath unloading
connections
Implement chemical unloading
�"`� procedures, where necessary

INDUSTRIAL ACTIVITIES POTENTIAL BMP SUMMARY
AND DESCRIPTION POLLUTANTS
Liquid storage tanks Chemical into Cover chemical storage areas,
stormwater outfalls where necessary
Provide secondary containment
around chemical storage areas
Utilize manually activated
containment drain valves, where
necessary
Maintain inventory of in-process
chemical containers
Utilize in-process liquid storage
tank level indicators, where
available
Oil bearing equipment Petroleum into Power Block 1 and 2 transmission
switchyards stormwater outfalls switchyards are constructed with
level grades and gravel surfaces
Secondary containment provided
for transformers
Erosion caused by truck Sediment into Preventative maintenance on
traffic or weather stormwater shoulders, erosion wattles, matting
and floc socs.
Landscape and herbicide Sediment into Cut grasses at higher level to
management stormwater encourage healthy growth.
Prohibit use of herbicides in
stormwater areas to prevent
erosion from lack of vegetation.
Groundwater flow Low pH water Bottom of SW009 and SWO10
contribution stormwater collection basins lined
with limestone (#57 stone and
riprap)
Limestone riprap and floc socs
utilized in SW009 drainage area
ditches

6.3 LANDFILL AREA
OUTFALL ID: SW011
Stormwater detention basin discharging into an energy
Discharge Structure: dissipator with ultimate discharge to the French Broad River.
Location: CCR landfill area
Drainage Area: 2.70 acres
Percent Impervious: 59.63%
OUTFALL ID: SWO12
Stormwater detention basin discharging into an energy
Discharge Structure: dissipator with ultimate discharge to the French Broad River.
Location: CCR landfill area
Drainage Area: 6.14 acres
Percent Impervious: 49.35%
OUTFALL ID: SW013*
Discharge Structure: Not applicable
Location: Not applicable
Drainage Area: Not applicable
Percent Impervious: Not applicable
*Stormwater discharge outfall SW013 will not be constructed. Industrial stormwater
drainage from the CCR landfill haul road (permitted as SW013) will be incorporated in the
SW012 drainage area during landfill construction. See Tab 7 for a short narrative describing
the incorporation of the CCR landfill haul road drainage in the SW012 drainage area. This
outfall number is requested to be removed from the permit.

Planned BMP Summary for CCR Landfill Drainage Areas (Outfalls SWO11
and SW012)
INDUSTRIAL ACTIVITIES POTENTIAL BMP SUMMARY
AND DESCRIPTION POLLUTANTS
Material Handling (ash) Fugitive dust settling in Dust suppression with
drainage area water/polymer
Good Housekeeping
Residue Hauling Vehicles Tracking of CCR products Covering Trucks
onto landfill access Truck Wash
roadway drainage areas Manually spraying tires and
checking trucks before leaving '64
ash basin
Street sweeping
Stormwater diversion curbs along
the CCR landfill haul road to direct
industrial stormwater runoff from
the road to SWO12
Leaking of petroleum from Petroleum into Waste handling personnel
haul truck stormwater outfalls inspecting trucks for leaks,
reporting any drips ors ills
Erosion caused by truck Sediment into Preventative maintenance on
traffic or weather stormwater access road shoulders-and
diversion berms, check dams,
erosion wattles, matting,
�. stormwater detention pond
foreba s and baffles
Landscape and Herbicide Sediment into Cut grasses at higher level to
management stormwater encourage healthy growth.
Prohibit use of herbicides in
stormwater areas to prevent
erosion from lack of vegetation

7 NARRATIVE OF FACILITY CHANGES
7.1 BACK HAUL ROAD AREA
In April 2020, the stormwater outfall SWO01 drainage and discharge area was
modified to support coal-fired Unit 1 and Unit 2 decommissioning and Duke Energy
Coal Combustion Product (CCP) project activities. The modifications removed the
coal storage railroad tracks (raw material storage area) from the SWO01 drainage
area and eliminated industrial stormwater drainage from the former coal storage
railroad tracks to SWO01. The modifications included:
• Removal of the former coal storage railroad tracks, immediately adjacent to
SWO01 to the west
• Construction of a grass-covered berm in the location of the former coal
storage railroad tracks, between the back haul road and Lake Julian
• Construction of drainage features including a culvert pipe, drainage swales,
and sediment basins to drain the grass-covered berm area of stormwater not
associated with industrial activities
On September 8, 2020, an asphalt curb was installed along the back haul road to
divert the former SW001 drainage area industrial stormwater runoff associated with
the road to the SWO03 drainage area. Approximately 0.16 acres of former SWO01
impervious drainage area (back haul road) was diverted to SW003.
There is no industrial activity within or industrial stormwater drainage to the former
SWO01. Duke Energy therefore requests the removal of stormwater outfall SWO01
from Industrial Stormwater Permit No. NCS000575.
7.2 SOUTH HAUL ROAD TO NEW ROCKWOOD ROAD (NOT
CONSTRUCTED)
Stormwater outfalls SW-7 and SW-8 were never constructed but are included in the
current Industrial Stormwater Permit No. NCS000575. Stormwater outfalls SW-7
and SW-8 were permitted in the existing Industrial Stormwater Permit for the
formerly proposed south haul road to New Rockwood Road.
Duke Energy no longer plans to construct the south haul road to New Rockwood
Road or the currently permitted stormwater outfalls SW-7 or SW-8.
Duke Energy therefore requests the removal of stormwater outfalls SW-7 and SW-8
from Industrial Stormwater Permit No. NCS000575.
7.3 COMBINED CYCLE STATION
Construction of the Asheville Combined Cycle Station was completed in 2020, and
the Combined Cycle Station began operations in January 2020. Two new stormwater
outfalls (SW009 and SW010) associated with the Combined Cycle Station were
,.� included in the January 29, 2020 Permit Modification Request letter submitted to the
North Carolina Department of Environmental Quality (DEQ).
The Asheville Steam Electric Plant coal-fired Unit 1 and Unit 2 were retired in
January 2020.

.10ftN
At the Asheville Combined Cycle Station, the stormwater within the powerhouse and
water treatment building process areas (e.g. turbine building drains, transformer
containments, water treatment chemical unloading drains, etc.) gets collected and
sent to a wastewater collection sump which discharges to a National Pollutant
Discharge Elimination System (NPDES) wastewater permitted outfall.
Stormwater collected in the transformer containments is sent to the wastewater
sump through turbine building drain tanks, then to an oil/water separator and
discharges through an NPDES wastewater permitted outfall.
The water treatment chemical unloading containment drains directly to the
wastewater collection sump and has downspouts feeding the containment from
water treatment roof drains.
All bulk storage containers and switchyard transformers located within the SWO09
and SW010 drainage areas are provided with some means of passive secondary
containment to prevent a release of materials to stormwater outfalls. Drum and
waste container storage areas are located within covered areas of the powerhouse
and water treatment buildings that drain to NPDES permitted wastewater outfalls,
and have containment curbs, or other secondary containment measures. Combined
Cycle Station chemical product unloading activities in the powerhouse and water
treatment building are performed in locations equipped with sumps or secondary
containment measures to prevent release of material to stormwater drains.
All exterior stormwater drains adjacent to the station's powerhouse flow into two
stormwater collection basins and discharge through stormwater outfalls SWO09 and
SW010 to a wetland area and then to the French Broad River.
Stormwater outfall SWO09 discharge is from the collection basin referred to as the
East Stormwater Collection Basin.
Stormwater outfall SW010 discharge is from the collection basin referred to as the
West Stormwater Collection Basin.
Stormwater outfall SWO09 and SWO10 descriptions, drainage area information, and
planned BMPs are summarized in Tab 6 of this permit renewal application.
7.4 LANDFILL AREA
Construction of an industrial landfill for the disposal of CCR from an on-site ash
basin began in 2020 and is ongoing. Construction of the landfill is scheduled to be
completed by January 2021, and the landfill and associated stormwater drainage
areas are scheduled to begin operation in mid-January 2021. The landfill is
scheduled to be closed in 2023.
Two new stormwater outfalls (SWO11 and SW012) associated with the CCR landfill
were included in the January 29, 2020 Permit Modification Request letter submitted
�••� to DEQ.
Based on an August 14, 2020 facility stormwater inspection performed by DEQ,
stormwater outfall SWO13 was added to the draft 2020 Industrial Stormwater Permit

No. NCS000575 modification to incorporate industrial stormwater runoff associated
with the CCR landfill haul road drainage area. Based on facility activity and grading
constraints, the draft-permitted stormwater outfall SWO13 drainage area has been
designed to instead drain industrial stormwater runoff from the CCR landfill haul
road drainage area to stormwater outfall SWO12. Therefore, stormwater outfall
SWO13 will not be constructed as the industrial stormwater from the CCR landfill
haul road drainage area will be included in the SWO12 drainage area and will
discharge through SWO12.
Duke Energy therefore requests the removal of stormwater outfall SWO13 from
Industrial Stormwater Permit No. NCS000575.
The stormwater that falls directly on the landfill will be collected in chimney drains
and processed as leachate which will be discharged under an industrial wastewater
pretreatment permit. Stormwater that falls on the landfill's access roads and the
landfill haul road will flow into trenches that drain into two stormwater collection
basins. These two stormwater collection basin outfalls are identified as stormwater
outfalls SWO11 and SWO12.
Duke Energy has no plans to treat, store, or dispose of significant materials on the
CCR landfill access roads, haul road, or on immediately surrounding areas adjacent
to the landfill in the future. No materials loading or unloading activities will take
place on the access roads, haul road, or on immediately surrounding areas. No
hazardous waste treatment, storage, or disposal will occur in the SWO11 or SWO12
drainage areas. CCR landfill activities will be in compliance with solid waste
management permit 1119-INDUS-2020.
Stormwater outfall SWO11 and SWO12 descriptions, drainage area information, and
planned BMPs are summarized in Tab 6 of this permit renewal application.

AMIN
S CERTIFICATION OF THE DEVELOPMENT AND
IMPLEMENTATION OF A STORMWATER POLLUTION
PREVENTION PLAN FOR THE PERMITTED FACILITY

STORMWATER POLLUTION PREVENTION PLAN
DEVELOPMENT AND. IMPLEMENTATION
CERTIFICATION
North Carolina Division of Energy, Mineral, and Land Resources— Stormwater Program
Facility Name: Asheville Steam Electric Plant dba Asheville Combined Cycle Station
Permit Number: NCS000575
Location Address: 46 Duke Energy Lane
Arden,NC 28704
County: Buncombe
"I certify, under penalty of law, that the Stormwater Pollution Prevention Plan (SPPP) document and all
attachments were developed and implemented under my direction or supervision in accordance with a system
designed to assure that qualified personnel properly gather and evaluate the information required by the SPPP.
Based on my inquiry of the person or persons who manage the system, or those persons directly responsible
for gathering the information, the information gathered is, to the best of my knowledge and belief, true,
accurate and complete."
And
"I certify that the SPPP has been developed, signed and retained at the named facility location, and the SPPP
has been fully implemented at this facility location in accordance with the terms and conditions of the
stormwater discharge permit."
And
"I am aware that there are significant penalties for falsifying information, including the possibility of fines and
imprisonment for knowing violations."
Sign (according to permit signatory requirements) and return this Certification. DO NOT
SEND STORMWATER POLLUTION PREVENTION PLAN WITH THIS CERTIFICATION.
Signature Date 10
1o't7/9-0
Antonio D.Price,PE Plant General Manager II
Print or type name of person signing above Title
SPPP Certification 10/13

9 FISH TISSUE MONITORING REPORTS IN THE FRENCH
BROAD RIVER 2017 - 2019

Asheville Steam Station
NPDES Permit No. NC0000396
Arsenic, Mercury, and Selenium Monitoring of Fish in the French Broad River
Buncombe County, North Carolina
Duke Energy Progress
June, 2020

Table of Contents
Page
1.0 Introduction..................................................................................................................... 1
2.0 Study Site Description and Sampling Locations .............................................................. 1
3.0 Target Species................................................................................................................... 1
4.0 Field Sampling Methods................................................................................................... 1
5.0 Laboratory Processing and Arsenic, Mercury, and Selenium Analysis............................ 2
6.0 Data Analysis and Reporting............................................................................................ 2
7.0 References......................................................................................................................... 3
List of Tables
Page
Table
I Arsenic, mercury, and selenium concentrations in axial muscle of fish from the
French Broad River during June, October, and November 2019. .................................... 5
�. 2 Baseline mercury and selenium concentrations in axial muscle of fish from the
French Broad River, August and November 2004............................................................ 6
List of Figures
Pa
Figure
1 French Broad River arsenic, mercury, and selenium monitoring locations...................... 4
i

1.0 Introduction
1411I. Duke Energy Progress (DEP) owns and operates the Asheville Steam Station (Asheville Station)
located on the east side of the French Broad River in Buncombe County, Arden, North Carolina. As
required by the Asheville Station's National Pollutant Discharge Elimination System (NPDES) Permit
No. NC0000396 (current through December 31, 2019), Special Condition A. (13), monitoring of
arsenic, mercury, and selenium in fish from the French Broad River was conducted. Fish tissue
monitoring (mercury and selenium only) was originally required historically after Flue Gas
Desulfurization(FGD)operations commenced in December of 2005. This data report is submitted to
fulfill the annual monitoring as required by the NPDES pen-nit.
2.0 Study Site Description and Sampling Locations
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).
3.0 Target Species
The target fish were black bass (preferred Smallmouth Bass) and sunfish (preferred Redbreast
Sunfish). Where the full complement of preferred target species was not available, Largemouth
and Bluegill were also included as necessary (Table 1). An attempt was made to collect 10 fish
per target species during three separate sampling events. 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).
4.0 Field Sampling Methods
Fish were collected using electrofishing procedures specified in the DEP Biology Program
Procedures Manual (Procedure NR-00080, Rev. 2 and NR-00095, Rev. 1) which is 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 and put in a labeled bag and placed on ice until frozen. Ancillary fisheries data
including species, total length (mm), 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
I

oxygen, and specific conductance were recorded daily at the surface at each sampling location
111106\ (available on request).
5.0 Laboratory Processing and Arsenic,Mercury, and Selenium Analysis
All fish samples were processed individually and analyzed in the trace element laboratory
according to procedure NR-00107, Rev. 4 Trace Element Monitoring Laboratory Procedure.
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 that re-analysis is needed.
6.0 Data Analysis and Reporting
Arsenic, mercury, and selenium concentrations (converted to µg/g wet weight) in the fish muscle
tissue collected during 2019 are shown in Table 1. In addition to the length and weight of each
fish, the dry-to-wet weight ratios are presented to convert the arsenic, mercury, and selenium
concentrations wet weight values back to dry weight values as desired. The 2004 baseline data
are presented as well for comparison purposes (Table 2).
Arsenic
During 2019, all 44 fish collected at all three sample locations were well below the USEPA
recreational screening value of 1.2 µg/g for arsenic (wet weight) (USEPA 2000).
Mercury
All sunfish species collected were below the USEPA recreational screening value of 0.4 µg/g (wet
weight) for mercury(USEPA 2000). One of six Largemouth Bass collected at Station UP, four of
six Smallmouth Bass at location Station DI, and four of five Smallmouth Bass at Station DN were
above the 0.4 µg/g mercury screening value. Two Largemouth Bass collected at Station DN were
below the mercury screening value. When evaluated, Smallmouth Bass appear to be slightly
greater accumulators of mercury compared to Largemouth Bass in the monitored reaches of
French Broad River.
2

Selenium
/IOM.
All fish collected were well below the USEPA recreational fisherman screening of 20 µg/g (wet
weight) (USEPA 2000).
When considered altogether, it does not appear that a pattern of arsenic, mercury, or selenium
accumulation in fish tissues during 2019 would be attributable to the Asheville Plant operations
(Table 2).
7.0 References
DER 2018. Asheville Steam Electric Plant mercury and selenium monitoring of fish in the French
Broad River.New Hill,NC.
USEPA. 2000. Guidance for assessing chemical contaminant data for use in fish advisories. Vol. 1.
Fish sampling and analysis. Third edition. EPA 823-B-00-007. United States Environmental
Protection Agency,Office of Water,Washington,DC.
3

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Table 1. Arsenic, mercury, and selenium concentrations (wet weight) in axial muscle of fish
from the French Broad River during June, October, and November 2019.
Fish Species Locations Month Length Weight As(µg/g) Wg(ltg/g) Se(µglg) Dry-to-Wet'
(mm) W Weight Ratio
Redbreast Sunfish UP June 190 159 0.15 0.08 0.47 0.20
Redbreast Sunfish UP June i90 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 17P 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 194 118 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
Largcmouth 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 179 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 394 703 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.l4 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 269 217 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 0.12 054 0.20
Smallmouth Bass DN October 395 768 0.17 0.61 0.36 0.22
' To convert to a dry weight,divide the vvet weight concentrations by the dry-to-wet weight ratio.
5

Table 2. Baseline mercury and selenium concentrations (wet weight) in axial muscle of fish
from the French Broad River during August and November 2004.1
Fish Species Locations Month Length Weight Hg Se Dry-to-Wet=
(MM) (g) (pg/g) (jLglg) Weight Ratio
Smalhnouth bass LIP August 246 201 0.87 0.39 0.22
Smalimotrthbass tip August 297 370 0.49 0.36 0.21
Smallmouth bass LIP August 346 620 0.44 0.22 0.22
Smalhnouth bass lip August 445 1.300 1.66 0.31 0.24
Smallmouth bass UP August 370 744 1 A9 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 sun fish UP August 190 160 0,12 0.32 0.20
Black redhorse UP August 372 340 <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 rcdhorse Lip 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
Smullmntuh bass DI August 263 223 0.52 0.32 0.22
Smallmouth bass DI August 355 565 0.54 4.14 0.22
Smallmouth bats DI August 374 871 0.27 0.47 0.23
Smallmouth bass DI Aueust 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?0 0.57 0.20
Redbreast sunfish DI Aueust 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 redhOTSe 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
Smallntoulh bass DN November 277 265 0.29 0.57 0.21
Smallmouth bass I)N November 295 410 0.32 0.15 0.21
Smallmouth bass 1)N Novembt.'r 310 460 0.77 0.35 0.22
Smallmouth bass DN November 347 620 0.68 0.33 0.22
Smallmouth bass I)N November 345 750 0.40 0.29 0.22
Bluegill DN August 135 59 <0.16 0.33 UO
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 I)N August 198 t56 <0.15 0.27 0.19
Redbreast sunfish I)N 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 198 154 <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 398 R10 0.5 0.40 0.21
Black redhorse DN August 423 910 <0.2 0.40 0.19
t Arsenic was not required by permit during baseline monitoring.
mow. To convert to a dry weight.divide the wet weight concentrations by the dry-to-wet weight ratio.
6

rf1p�
Asheville Steam Station
NPDES Permit No. NC0000396
Mercury and Selenium Monitoring of Fish in the French Broad River
�. Buncombe County, North Carolina
Duke Energy Progress
April, 2019

Table of Contents
Pa
Se
1.0 Introduction.................... 1
2.0 Study Site Description and Sampling Locations .............................................................. 1
3.0 Target Species................................................................................................................... 1
4.0 Field Sampling Methods................................................................................................... 1
5.0 Laboratory Processing and Selenium Analysis................................................................. 2
6.0 Data Analysis and Reporting............................................................................................ 2
7.0 References......................................................................................................................... 3
List of Tables
Page
Table
1 Mercury and selenium concentrations in axial muscle of fish from the
French Broad River during June, October, and November 2018. .................................... 5
2 Baseline mercury and selenium concentrations in axial muscle of fish from the
French Broad River, August and November 2004............................................................ 7
List of Figures
Page
Figure
1 French Broad River mercury and selenium monitoring locations.................................... 4
i

1.0 Introduction
Duke Energy Progress (DEP) owns and operates the Asheville Steam Station (Asheville Station)
located on the east side of the French Broad River in Buncombe County, Arden, North Carolina. As
required by the Asheville Station's National Pollutant Discharge Elimination System (NPDES)Permit
No. NC0000396 (current prior to December 1, 2018), Special Condition A. (13), monitoring of
mercury and selenium in fish from the French Broad River began after Flue Gas Desulfurization
(FGD) operations commenced in December of 2005. Sampling was conducted according to the
previously approved monitoring plan. This data report is submitted to fulfill the annual monitoring as
required by the above NPDES permit.
2.0 Study Site Description and Sampling Locations
Fish were collected from three locations of 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).
3.0 Target Species
The target fish were black bass (preferred Smallmouth Bass), sunfish (preferred Redbreast
Sunfish) and suckers (preferred Black Redhorse). Where the full complement of preferred target
species were not available, Largemouth Bass, Rock Bass, Spotted Bass, Bluegill, and Golden
Redhorse were substituted as necessary (Table 1). 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).
4.0 Field Sampling Methods
Fish were collected using electrofishing procedures specified in the DEP Biology Program
Procedures Manual (Procedure NR-00080, Rev. 2 and NR-00095, Rev. 1) which is 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 and put in a labeled (date, station, etc.) bag and placed on ice until frozen. Ancillary
fisheries data including species, number, total length (mm), and total weight (g) were also
recorded. Each day collected fish were transferred to a freezer on-site and maintained in the
frozen state until processing at the DEP New Hill Trace Element Laboratory. Associated water

quality data including water temperature, dissolved oxygen, and specific conductance were
,,q recorded daily at the surface at each sampling location.
5.0 Laboratory Processing and Mercury and Selenium Analysis
All fish samples were processed in the trace element laboratory according to procedure NR-
00107, Rev. 4 Trace Element Monitoring Laboratory Procedure. Aliquots of the processed
samples (lyophilized left axial muscle; right muscle occasionally included when needed) were
sent to Pace Analytical for analysis (EPA 7374 — Hg, EPA 6020 — Se). Quality control was
achieved utilizing analytical standards, replicates, and certified reference materials. Following
analysis, the processed samples were archived and will be kept at least two years in the event
that re-analysis is needed.
6.0 Data Analysis and Reporting
Mercury and selenium concentrations (converted to µg/g wet weight) in the fish muscle tissue
collected during 2018 are shown in Table 1. In addition to the length and weight of each fish, the
dry-to-wet weight ratios are presented to convert the mercury and selenium concentrations wet
weight values back to dry weight values as desired. The 2004 baseline data are presented as well
for comparison purposes (Table 2). During 2018, 67 of the 88 fish collected at all three sample
locations were below the North Carolina Health Directors Mercury Action Advisory Level of 0.4
µg/g wet weight (NCDHHS 2006). At location UP, one Golden Redhorse, two Redbreast
Sunfish, two Largemouth Bass, two Rock Bass, and two Smallmouth Bass had mercury
concentrations in axial muscle (edible flesh) equivalent to or greater than the advisory level
(highlighted in Table 1). Eight Golden Redhorse and one Smallmouth Bass at location DI had
mercury tissue concentrations above the advisory level while one Redbreast Sunfish and one
Smallmouth Bass at location DN were above the level (also highlighted in Table 1). Based on the
mercury concentrations in fish at all three locations, the bioaccumulation pattern appears to be
random with no apparent contribution of mercury in fish tissues attributable to the Asheville
Station discharge to the French Broad River. During 2018, all fish collected at the three locations
were below the North Carolina human consumption advisory level of 10 µg/g (wet weight) for
selenium, however, two fish (highlighted in Table 1) of 27 fish collected at location DI were
slightly above the USEPA screening value of 2.457 µg/g (wet weight) for subsistence fishermen
(USEPA 2000).
2

7.0 References
NCDHHS. 2006. Health effects of methylmercury and North Carolina's advice on eating fish.
North Carolina Occupational and Environmental Epidemiology Branch. Raleigh,NC.
USEPA. 2000. Guidance for assessing chemical contaminant data for use in fish advisories. Vol. 1.
Fish sampling and analysis. Third edition. EPA 823-B-00-007. United States Environmental
Protection Agency,Office of Water,Washington,DC.
Amok

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rr r
f
r �
Station

Table 1. Mercury and selenium concentrations (wet weight) in axial muscle of fish from the
French Broad River during June, October, and November 2018.
Fish Species Locations Month Length Weight Hg Se Dry-to-Wet*
(MM) (g) (µg/g) (µg/g) Weight Ratio
Golden Redhorse UP June 475 959 0.35 0.20 0.20
Golden Redhorse UP June 362 460 0.13 0.17 0.22
Golden Redhorse UP June 350 408 0.14 0.17 0.21
Golden Redhorse UP June 401 564 0.23 0.14 0.19
Golden Redhorse UP June 449 1049 0.31 0.23 0.21
Golden Redhorse UP June 420 616 0.49 0.15 0.20
Golden Redhorse UP June 408 616 0.30 0.20 0.21
Golden Redhorse UP June 456 965 0.35 0.15 0.18
Golden Redhorse UP June 422 736 0.31 0.17 0.21
Golden Redhorse UP June 432 917 0.36 0.22 0.18
Largemouth Bass DI October 253 224 0.20 0.45 0.20
Largemouth Bass UP November 359 701 0.48 0.17 0.20
Largemouth Bass UP November 362 680 0.45 0.22 0.20
Redbreast Sunfish UP June 173 105 0.16 0.29 0.20
Redbreast Sunfish UP June 180 118 0.05 0.40 0.22
Redbreast Sunfish UP June 210 176 0.09 0.53 0.21
Redbreast Sunfish UP June 195 175 0.06 2.12 0.21
Redbreast Sunfish UP June 180 144 0.08 0.28 0.22
Redbreast Sunfish UP June 195 142 0.08 0.63 0.20
Redbreast Sunfish UP June 190 145 0.60 0.24 0.20
Redbreast Sunfish UP June 171 125 0.48 0.26 0.22
Redear Sunfish UP November 234 245 0.17 0.58 0.21
Redear Sunfish UP November 193 124 0.47 0.34 0.21
Rock Bass UP June 220 184 0.17 0.46 0.21
Rock Bass UP June 225 250 0.56 0.39 0.21
Rock Bass UP June 235 249 0.34 0.40 0.21
Rock Bass UP June 212 237 0.58 0.20 0.20
Smallmouth Bass UP June 355 520 0.05 0.75 0.21
Smallmouth Bass UP June 218 121 0.06 0.42 0.20
Smallmouth Bass UP June 230 162 0.43 0.24 0.20
Smallmouth Bass UP June 260 240 0.35 0.31 0.20
Redbreast Sunfish DI October 155 71 0.08 2.74 0.20
Redbreast Sunfish DI October 194 170 0.24 0.22 0.20
Bluegill DI October 134 40 0.04 2.20 0.20
Bluegill DI October 137 58 0.06 0.32 0.19
Bluegill DI October 156 80 0.04 1.89 0.20
Bluegill DI October 139 52 0.06 0.35 0.19
Bluegill DI October 134 46 0.10 0.30 0.19
Bluegill DI October 116 32 0.05 3.23 0.19
Golden Redhorse DI June 430 798 0.45 0.15 0.17
Golden Redhorse DI June 450 912 0.43 0.21 0.19
Golden Redhorse DI June 440 997 0.43 0.30 0.19
Golden Redhorse DI June 510 1168 0.47 0.16 0.20
Golden Redhorse DI June 535 1401 0.58 0.24 0.20
Golden Redhorse DI June 515 1120 0.42 0.24 0.20
Golden Redhorse DI June 453 843 0.59 0.19 0.19
Golden Redhorse DI June 516 1285 0.38 0.18 0.21
Golden Redhorse DI June 533 1420 0.39 0.14 0.20
Golden Redhorse DI June 425 767 0.47 0.18 0.18
Rock Bass DI October 183 129 0.14 0.24 0.20
Rock Bass DI October 153 76 0.12 0.33 0.20
Rock Bass DI October 167 98 0.11 0.26 0.20
Rock Bass DI October 155 76 0.18 0.43 0.21
Rock Bass DI October 165 83 0.12 0.27 0.20
Rock Bass DI October 190 137 0.12 1.92 0.21
Rock Bass DI October 156 83 0.12 0.36 0.20
Smallmouth Bass DI October 243 210 0.92 0.41 0.21
Smallmouth Bass DI October 243 203 0.19 0.16 0.22
Golden Redhorse DN June 482 1025 0.18 0.39 0.21
Golden Redhorse DN June 451 926 0.37 0.49 0.19
5

(Table 1 cont.)
Fish Species Locations Month Length Weight Hg Se Dry-to-Wet*
(mm) (g) (µg/g) (µg/g) Weight Ratio
Golden Redhorse DN June 415 744 0.38 0.44 0.18
Golden Redhorse DN June 465 1028 0.40 0.38 0.20
Golden Redhorse DN June 432 835 0.18 0.57 0.20
Golden Redhorse DN June 372 509 0.11 0.50 0.21
Golden Redhorse DN June 480 1127 0.39 0.45 0.20
Golden Redhorse DN June 470 985 0.18 0.47 0.21
Golden Redhorse DN June 430 944 0.32 0.49 0.20
Golden Redhorse DN June 442 829 0.33 0.35 0.17
Redbreast Sunfish DN October 176 104 0.17 0.37 0.20
Redbreast Sunfish DN October 16l 70 0.17 0.44 0.20
Redbreast Sunfish DN October 144 60 0.17 0.56 0.21
Redbreast Sunfish DN October 128 42 0.09 0.62 0.21
Redbreast Sunfish DN October 180 125 0.06 0.44 0.20
Redbreast Sunfish DN October 169 94 0.10 0.40 0.20
Redbreast Sunfish DN October 180 116 0.11 0.42 0.20
Redbreast Sunfish DN October 195 165 0.15 0.44 0.18
Redbreast Sunfish DN October 184 145 0.12 0.36 0.20
Redbreast Sunfish DN October 182 115 0.08 0.34 0.20
Rock Bass DN June 170 99 0.07 0.46 0.21
Rock Bass DN October 211 171 0.49 0.39 0.20
Rock Bass DN October 138 59 0.1 I 0.62 0.20
Rock Bass DN October 157 82 0.08 0.65 0.20
Rock Bass DN October 180 125 0.29 0.44 0.19
Smallmouth Bass DN June 200 96 0.06 0.50 0.20
Smallmouth Bass DN June 332 478 0.60 0.32 0.20
Smallmouth Bass DN June 228 148 0.28 0.61 0.20
Smallmouth Bass DN October 205 119 0.18 0.44 0.20
Smallmouth Bass DN October 196 94 0.12 0.58 0.20
* To convert to a dry weight,divide the wet weight concentrations by the dry-to-wet weight ratio.
6

Table 2. Baseline mercury and selenium concentrations (wet weight) in axial muscle of fish
from the French Broad River during August and November 2004.
Fish Species Locations Month Length Weight Hg Se Dry-to-Wet*
(MM) (g) (µg/g) (µg/g) Weight Ratio
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 $50 <0.17 0.19 0.21
Black redhorse UP August 410 790 0.53 0.26 0.20
Black redhorse UP August 413 943 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 0.3 0.22
Black redhorse DI August 383 0.25 0.25 0.3 0.21
Black redhorse DI August 457 0.52 0.48 0.5 0.20
Black redhorse DI August 465 0.76 0.21 0.2 0.21
Black redhorse DI August 493 0.69 0.21 0.2 0.21
Black redhorse DI August 475 0.43 0.77 0.8 0.20
Black redhorse DI November 410 <0.18 0.26 0.2 0.20
Smallmouth 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.l2 0.73 0.20
Redbreast sunfish DN August 198 154 <0.16 0.93 0.20
Black redhorse DN August 365 509 <0.2 0.5 0.20
Black redhorse DN August 356 518 0.1 0.3 0.20
Black redhorse DN August 375 651 <0.2 0.8 0.20
Black redhorse DN August 395 755 <0.2 0.5 0.20
Black redhorse DN August 388 810 0.5 0.4 0.21
Black redhorse DN August 423 910 <0.2 0.4 0.19
* To convert to a dry weight,divide the wet weight concentrations by the dry-to-wet weight ratio.
,Av
7

Asheville Steam Station
NPDES Permit No. NC0000396
Mercury and Selenium Monitoring of Fish in the French Broad River
Buncombe County, North Carolina
Duke Energy Progress
April, 2018

Table of Contents
Page
1.0 Introduction....................................................................................................
2.0 Study Site Description and Sampling Locations .............................................................. 1
3.0 Target Species................................................................................................................... 1
4.0 Field Sampling Methods................................................................................................... l
5.0 Laboratory Processing and Selenium Analysis................................................................. 2
6.0 Data Analysis and Reporting............................................................................................ 2
7.0 References......................................................................................................................... 3
List of Tables
Page
Table
l Mercury and selenium concentrations in axial muscle of fish from the
French Broad River during June, October, and November 2017. .................................... 5
2 Baseline mercury and selenium concentrations in axial muscle of fish from the
French Broad River, August and November 2004............................................................ 7
List of Figures
Paae
Fieure
I French Broad River mercury and selenium monitoring locations.................................... 4
r
i

1.0 Introduction
Duke Energy Progress (DEP) owns and operates the Asheville Steam Station (Asheville Station)
located on the east side of the French Broad River in Buncombe County, Arden, North Carolina. As
required by the Asheville Station's National Pollutant Discharge Elimination System (NPDES) Permit
No. NC0000396, Special Condition A. (13), monitoring of mercury and selenium in fish from the
French Broad River began after Flue Gas Desulfurization (FGD) operations commenced in December
of 2005. Sampling was conducted according to the previously approved monitoring plan. This data
report is submitted to fulfill the monitoring program as required by the NPDES permit.
2.0 Study Site Description and Sampling Locations
Fish were collected from three locations of 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).
3.0 Target Species
The target fish were black bass (preferred Smallmouth Bass), sunfish (preferred Redbreast
Sunfish) and suckers (preferred Black Redhorse). Where the full complement of preferred target
species were not available, Largemouth Bass, Rock Bass, Spotted Bass, Bluegill, and Golden
Redhorse were substituted as necessary (Table I). 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).
4.0 Field Sampling Methods
Fish were collected using electrofishing procedures specified in the DEP Biology Program
Procedures Manual (Procedure NR-00080, Rev. 1) which is 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 and put in a
labeled (date, station, etc.) bag and placed on ice until frozen. Ancillary fisheries data including
species, number, total length (mm), and total weight (g) were also recorded. Each day collected
Fish were transferred to a freezer on-site and maintained in the frozen state until processing at the
DEP New Hill Trace Element Laboratory. Associated water quality data including water
r temperature, dissolved oxygen, and specific conductance were recorded daily at the surface at
each sampling location.
I

5.0 Laboratory Processing and Mercury and Selenium Analysis
All fish samples were processed in the trace element laboratory according to procedure NR-
00107, Rev. 4 Trace Element Monitoring Laboratory Procedure. Aliquots (0.15 grams) of the
processed samples (lyophilized left axial muscle; right muscle occasionally included when
needed) were analyzed For mercury and selenium by x-ray spectro photometry. Quality control
was achieved utilizing analytical standards, replicates, and certified reference materials.
Following analysis, the processed samples were archived and will be kept at least two years in
the event that re-analysis is needed.
6.0 Data Analysis and Reporting
Mercury and selenium concentrations (converted to µg/g wet weight) in the fish muscle tissue
collected during 2017 are shown in Table 1. In addition to the length and weight of each fish, the
dry-to-wet weight ratios are presented to convert the mercury and selenium concentrations wet
weight values back to dry weight values as desired. The 2004 baseline data are presented as well
Amok, for comparison purposes (Table 2). During 2017, 80 of the 90 fish collected at all three sample
locations were below the North Carolina Health Directors Mercury Action Advisory Level of 0.4
µg/g wet weight (NCDHHS 2006). At location UP, one Black Redhorse, one Smallmouth Bass,
and one Spotted Bass had mercury concentrations in axial muscle (edible flesh) equivalent to or
greater than the advisory level (highlighted in Table 1). Only one fish at location D1, a Rock
Bass, had mercury tissue concentrations above the advisory level while two Golden Redhorse and
three Smallmouth Bass at location DN were above the level (also highlighted in Table 1). Based
on this mercury bioaccumulation pattern, there was no apparent contribution of mercury in fish
tissues that was attributable to the Asheville Station discharge to the French Broad River. During
2017, all fish collected at the three locations were below the North Carolina human consumption
advisory level of 10 µg/g (wet weight) for selenium, however, three fish (highlighted in Table I)
of thirty fish collected at location DI were slightly above the USEPA screening value of 2.457
µg/g(wet weight) for subsistence fishermen (USEPA 2000).
2

7.0 References
NCDHHS. 2006. Health effects of methylmercury and North Carolina's advice on eating fish.
North Carolina Occupational and Environmental Epidemiology Branch. Raleigh,NC.
USEPA. 2000. Guidance for assessing chemical contaminant data for use in fish advisories. Vol. 1.
Fish sampling and analysis. Third edition. EPA 823-B-00-007. United States Environmental
Protection Agency, Office of Water, Washington, DC.
3

I /I
�r
Air
t_

Table 1. Mercury and selenium concentrations (wet weight) in axial muscle of fish from the
French Broad River during June, October,and November 2017.
Fish Species Locations Month Length Weight Ng Se Dry-to-Wet*
(mm) (g) (µgtg) (µg/g) Weight Ratio
Redbreast Sunfish UP June 206 227 024 034 020
Redbreast Sunfish UP June 196 166 021 036 021
Redbreast Sunfish UP June 183 120 008 0.28 020
Redbreast Sunfish UP June 183 136 0 I I 033 019
Redbreast Sunfish UP June 187 135 007 033 020
Redbreast Sunfish UP June 184 121 Oil 037 0 18
Redbreast Sunfish UP June 188 141 012 030 019
Redbreast Sunfish UP June 180 126 015 035 0 19
Redbreast Sunfish UP June 171 113 <0 03 1 12 020
Redbreast Sunfish UP June 164 94 Oil 042 Oil)
Smallmouth Bass UP June 377 555 090 017 0 19
Smallmouth Bass UP June 300 369 025 024 019
Smallmouth Bass UP June 319 450 039 027 020
Smallmouth Bass UP June 245 211 039 045 020
Smallmouth Bass UP June 270 262 029 095 020
Rock Bass UP June 221 236 023 039 0.20
Rock Bass UP June 221 245 029 036 0 19
Rock Bass UP June 213 200 015 055 0 19
Rock Bass UP June 198 190 0 19 037 0 19
Spotted Bass UP June 316 464 0.50 037 019
Black Redhorsc UP June 455 1062 022 025 019
Black Redhorsc UP June 395 530 014 0 19 020
Black Rcdhorse UP June 397 593 036 023 020
Black Redhorsc UP June 443 838 0.22 017 020
Black Redhorse UP June 400 615 031 021 020
Black Redhorse UP June 442 741 0.27 0 16 020
Black Redhorsc UP June 407 788 018 0.22 021
Black Redhorse UP June 457 924 0.49 024 0?-
Black Redhorsc UP June 447 744 026 016 021
Black Redhorsc UP June 446 764 034 019 019
Redbreast Sunfish DI June 204 179 010 041 0.21
Redbreast Sunfish DI October 159 82 008 1.27 0 19
Redbreast Sunfish DI October 153 60 0 14 2.50 0 19
Redbreast Sunfish DI October 168 75 <0 05 095 0.20
Redbreast Sunfish DI October 162 67 <0 05 2.56 019
Redbreast Sunfish DI October 167 80 <0.05 061 0.16
Redbreast Sunfish DI October 181 84 <0 05 0.36 0.17
Blucgill DI June 170 122 014 064 017
Bluegill DI June 150 69 -0 05 3.92 0 18
Bluegtil DI June 153 68 009 0.69 0.21
Smallmouth Bass DI June 205 128 020 022 020
Smallmouth Bass DI June 188 90 0 14 028 0.21
Smallmouth Bass DI June 314 424 0 is 016 0.20
Smallmouth Bass DI June 311 460 026 0.29 0 19
Smallmouth Bass DI June 181 79 0.21 036 020
Smallmouth Bass DI June 201 110 024 0.42 019
Smallmouth Bass DI June 191 99 0 IS 0.64 020
Smallmouth Bass DI June 202 118 023 037 021
Smallmouth Bass DI October 359 640 034 016 021
Rock Bass DI June 217 238 0.48 026 021
Golden Redhorsc DI June 383 626 030 024 0.20
Golden Redhorsc DI June 444 958 030 020 019
Golden Redhorsc DI June 421 832 0.34 021 0.20
Golden Redhorsc Dl June 408 774 023 024 0.22
Golden Redhorsc DI June 450 906 030 022 0.20
Golden Redhorsc DI June 435 826 031 0.41 021
Golden Redhorse DI June 440 942 031 067 021
Golden Redhorsc DI June 427 942 029 1.52 021
Black Redhorsc DI June 450 1072 039 025 020
Black Redhorsc DI June 505 1200 0.49 022 021
iAvftN
5

(Table Y cont.)
Fish Species Locations Month Length Weight Hg Se Dry-to-Wet'
(MM) (g) (µg/g) (µ /fig) Weight Ratio
Redbreast Sunfish DN June 174 122 0,24 075 020
Redbreast Sunfish DN June 184 116 0.21 0.69 019
Redbreast Sunfish DN June 139 62 008 077 020
Redbreast Sunfish DN November 172 90 0 11 079 0 19
Redbreast Sunfish DN November 175 102 0.07 047 019
Redbreast Sunfish DN November 180 115 Oil 066 020
Redbreast Sunfish DN November 195 116 012 0,65 020
Redbreast Sunfish DN November 186 106 0 l s 067 019
Redbreast Sunfish DN November I80 97 <0 05 079 0 19
Redbreast Sunfish DN November 193 132 0 11 023 020
Smallmouth Bass DN June 307 356 0.26 081 020
Smallmouth Bass DN June 168 70 023 055 0 19
Smallmouth Bass DN June 281 284 0.35 045 0 19
Smallmouth Bass DN June 273 288 0.24 071 020
Smallmouth Bass DN June 282 302 030 083 020
Smallmouth Bass DN June 315 418 0.42 074 021
Smallmouth Bass ON June 408 746 0.51 045 020
Smallmouth Bass DN June 285 325 0.42 071 020
Smallmouth Bass DN June 180 86 0.20 062 020
Smallmouth Bass DN June 173 68 015 080 018
Black Redhorse DN October 515 1200 038 057 019
Golden Redhorse DN October 441 1000 032 073 019
Golden Redhorse DN October 464 1044 036 073 019
Golden Redhorse DN October 426 822 036 060 0 18
Golden Redhorse DN October 437 938 028 074 0 19
Golden Redhorse DN October 443 998 026 063 0 18
Golden Redhorse DN October 446 982 038 066 0 19
Golden Redhorsc DN October 474 1175 0.53 063 0 18
Golden Redhorse DN October 545 1350 0.57 045 018
Golden Redhorse DN October 421 870 028 046 017
To convert to a dry weight,divide the wet weight concentrations by the dy-to-wet weight ratio
6

Table 2. Baseline mercury and selenium concentrations (wet weight) in axial muscle of fish
from the French Broad River during August and November 2004.
Fish Species Locations Month Length Weight Hg Se Dry-to-Wet*
(MM) (a) (µg ) (µg/g) Weight Ratio
Smallmouth bass UP August 246 201 087 039 022
Smallmouth bass UP August 297 370 0.49 036 021
Smallmuuth bass UP August 346 620 044 022 022
Smallmouth bass tip August 445 1.300 166 031 0.24
Smallmouth bass UP August 370 744 149 030 020
Redbreast sunfish UP August 172 106 <0 18 028 020
Redbreast sunfish UP August 160 87 032 024 020
Redbreast sunfish UP August 145 72 <0 27 039 030
Redbreast sunfish UP August 149 60 <0 17 0.23 021
Redbreast sunfish UP August l90 160 0 12 032 020
Black redhorsc UP August 372 540 <0 15 026 021
Black redhorsc UP August 380 550 <0 17 019 021
Black redhorse UP August 410 790 0.53 026 020
Black redhorse UP August 40 843 0.54 024 019
Block redhorsc UP August 415 989 0.40 030 020
Black redhorse UP August 405 863 0.46 030 020
Largemouth bass DI August 475 1,725 0.74 123 021
Largemouth bass DI August 395 611 0 16 146 020
Largemouth bass DI August 405 795 0 17 021 021
Smallmouth bass DI August 263 223 0.52 032 022
Smallmouth bass DI August 335 565 054 4 14 0 22
Smallmouth bass DI August 374 971 027 047 023
Smallmouth bass DI August 368 802 074 025 022
Smallmouth bass DI August 440 1 300 0.99 045 022
Redbreast sunfish DI August 136 52 <0 19 381 021
Redbreast sunfish Di August 183 108 <0 17 3.61 019
Redbreast sunfish DI August 164 80 020 0.37 020
Redbreast sunfish DI August 182 128 <0 l5 0.69 019
Redbreast sunfish DI August 177 109 074 1.23 020
Redbreast sunfish DI August 149 58 <0 16 146 020
Black redhorsc DI August 375 0 18 0.26 0 3 022
Black redhorsc DI August 383 023 025 03 021
Black redhorsc DI August 457 052 0.48 05 020
Black redhorsc DI August 465 076 021 02 021
Black redhorsc DI Aucust 493 069 021 0.2 021
Black redhorse DI August 475 043 0.77 0.8 020
Black redhorse DI November 410 -0 18 026 02 020
Smallmouth bass DN November 277 265 029 057 021
Smallmouth bass DN November 295 410 032 0 is 021
Smallmouth bass DN November 310 460 077 035 022
Smallmouth bass DN November 347 620 068 0.33 022
Smallmnuth bass DN November 345 750 0.40 0.29 022
Bluegdl DN August 135 59 <0 16 033 020
Redbreast sunfish DN August 162 66 032 083 020
Redbreast sunfish DN August 175 96 <0.18 076 022
Redbreast sunfish DN August 185 139 0.25 031 019
Redbreast sunfish DN August 198 156 <0 15 0.27 0 19
Redbreast sunfish DN August 273 324 0.54 019 021
Redbreast sunfish DN August 126 46 <0 14 041 020
Redbreast sunfish DN August 187 170 012 073 020
Redbreast sunfish DN August 198 154 <0 16 093 0 20
Black redhorse DN August 365 509 <0 2 03 020
Black redhorse DN August 356 518 0 1 03 020
Black redhorse DN August 375 651 <0 2 09 020
BIack redhorsc DN August 395 755 <0 2 05 020
Black redhorsc DN August 398 810 0.5 04 021
Black redhorsc DN Au ust 423 910 <0 2 04 0 19
• To convert to a dry%%eight.divide the act+verght concentrations by the dry-to-wet weight ratio.
7