NC0004774_Draft Permit_20200511

_ ;„.,,STATE :',,k
/ PVC °'.\ N. I
ROY COOPER ',1I \71;Governor ,u„� :f ,
MICHAEL S.REGAN `
Secretary *440.Amv,o. '
S.DANIEL SMITH NORTH CAROLINA
Director Environmental Quality
May 11, 2020
Mr. Paul Draovitch,Senior Vice President
Environmental,Health and Safety
Duke Energy Carolinas,LLC
Mail Code EC13K
P.O. Box 1006
Charlotte,North Carolina 28201-1006
Subject: Draft NPDES Major
Modification
Permit NC0004774
Buck Combined Cycle Station
' Rowan County
Facility Class I
Dear Mr. Draovitch:
Enclosed with this letter is a copy of the draft Major Modification for your facility. Please review
the draft very carefully to ensure thorough understanding of the conditions and requirements it
contains.
The draft Major Modification contains the following significant changes from your current
permit:
• Dewatering flow limit for Outfall 007 was increased from 0.72 MGD to 1.1 MGD to assure a
timely closure of the ash pond.
• Outfall 006 has been eliminated from the permit,it was never constructed.
• Outfall 002 has been eliminated from the permit since all the flows have been diverted to•
other Outfalls.
• Outfall 002A has been eliminated from the permit since it has been physically removed from
the facility.
• Outfall 007 decanting phase effluent pages have been eliminated from the permit since the
decanting phase of the operations has been completed.
• The permit added an authorized use of acid, alkaline,sodium hypochlorite,and sodium
bisulfate solutions,and sand filters at Outfall 007 to achieve consistent compliance with the
effluent limits.
DE ---A„
North Carolina Department of Environmental Quality I Division of Water Resources
f/� 512 North Salisbury Street 11617 Mail Service Center I Raleigh,North Carolina 27699 1617
NORTH CAROLINA
0.0erbeeret.4 EnvIrcenowasimrni- / 919.707.9000

• One downstream sampling location (10,000 ft downstream of Outfall 007) was removed to
be consistent with other Duke permits and because sampling indicated no water quality
concerns.
Please provide any comments you have regarding the draft permit to this office by June 15,
2020. At this time, the Division is also publishing a notice in the newspapers of general circulation in
Rowan County,inviting public comment on the draft major modification. Following the 30-day
comment period,we will review all pertinent comments received and take appropriate action on the
permit modification.
The NPDES Standard Conditions (Parts II, III,and IV) are not included with this draft. They can be
found at the following link if you would like to review them in conjunction with this draft permit.
https://bit.ly/2BZ4xxx
If you have any questions about the NPDES permit process,please contact me at the following e-
mail address: sergei.chernikovancdenr.gov, or telephone number: 919-707-3606.
•
Sincerely,
Sergei Chernikov,Ph.D.
Environmental Engineer III
Complex NPDES Permitting Unit
cc: Central Files
NPDES Files
EPA Region IV(e-copy)
Mooresville Regional Office/Water Quality(e-copy)
Mooresville Regional Office/PWS (e-copy)
WSS/Aquatic Toxicology Unit(e-copy)

NC0004774
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
DRAFT PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
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 Carolinas, LLC
is hereby authorized to discharge wastewater from a facility located at the
Buck Combined Cycle Station
1385 Dukeville Road
Salisbury
Rowan County
to receiving waters designated as the Yadkin River(upper High Rock Lake)in the Yadkin-Pee Dee
River Basin
in accordance with effluent limitations,monitoring requirements,and other conditions set forth in
Parts I,II,and III hereof.
This permit modification shall become effective
This permit and authorization to discharge shall expire at midnight on October 31,2023.
Signed this day
S. Daniel Smith,Director
Division of Water Resources
By Authority of the Environmental Management
Commission
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NC0004774
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked.As
of this permit issuance, any previously issued permit bearing this number is no longer effective. Therefore, the
exclusive authority to operate and discharge from this facility arises under the permit conditions,
requirements, terms, and provisions included herein.
Duke Energy Carolinas, LLC
is hereby authorized to:
1. Continue the following activities at the Buck Combined Cycle Station,comprising the former
Buck Steam Station(BSS),the Combustion Turbine Combined Cycle(CTCC)Plant,a Coal Ash
Beneficiation Plant(proposed),and associated facilities,located at 1385 Dukeville Road in
Salisbury,Rowan County:
• Discharge treated wastewater,including water treatment wastes,stormwater,and
contaminated groundwater seepage from the BSS and low volume wastes,cooling tower
blowdown,water treatment wastes,and stormwater from the CTCC Plant through Outfall
007(including the use of acid,alkaline,sodium hypochlorite,and sodium bisulfate solutions,
and sand filters),Yard Sump emergency overflows through Outfall 002A,and filter
screenings from the raw water intake through Outfall 004 to the Yadkin River(upper High
Rock Lake),classified as WS-V waters in the Yadkin-Pee Dee River Basin,at the locations
shown on the attached map; and
2. Upon elimination of all BSS wastewaters,discharge wastewaters from the CTCC and Coal Ash
Beneficiation Plants at Outfall 001A(formerly Outfall 001) to the Yadkin River at the locations
shown on the attached map;and
3. Upon diversion of the CTCC discharge to Outfalls 001A,discharge treated ash basin dewatering
wastes at Outfall 007 to the Yadkin River at the locations shown on the attached map;and
4. Discharge flows from constructed seeps at Outfalls 111 and 117 to an unnamed tributary to the
Yadkin River at the location shown on the attached map;and
Install an emergency overflow spillway at the ash settling pond in accordance with good
engineering practice and all applicable dam safety and other requirements and approvals.
Page 2 of 18

NC0004774
Part I
A.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 001A-
CTCC Operations)
[15A NCAC 02B .0400 et seq.,02B .0500 et seq.]
a. During the period beginning upon both elimination of all remaining waste flows from the
Buck Steam Station and diversion of CTCC Plant flows to Outfall 001A and lasting until
permit expiration the Permittee is authorized to discharge wastewaters,as described herein,
from Outfall 001A.Such discharges shall be limited and monitored by the Permittee as
specified below:
EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
PARAMETER
Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location 1
Flow, MGD Daily Pump logs Effluent
or similar readings
pH >_ 6.0 and <_ 9.0 standard units Daily 2 Grab Effluent
Temperature 35°C(95°F) Daily Grab Effluent
Temperature Daily Grab Intake and
Effluent
Total Nitrogen, mg/L3 Monthly Grab Effluent
Total Phosphorus, mg/L Monthly Grab Effluent
Total Suspended Solids 23.0 mg/L 74.0 mg/L 2/Month Grab Effluent
Oil and Grease 11.0 mg/L 15.0 mg/L 2/Month Grab Effluent
Total Residual Chlorine 4 28.0 pg/L 2/Month Grab Effluent
Free Available Chlorine 4 200 pg/L 500 Ng/L 2/Month Grab Effluent
Total Hardness, mg/L as CaCO3 2/Month Grab Effluent
Total Arsenic, pg/L 5 Quarterly Grab Effluent
Total Selenium, pg/L 5 Quarterly Grab Effluent
Total Mercury, ng/L 5 Quarterly Grab Effluent
Total Aluminum, mg/L 5 Quarterly Grab Effluent
Total Antimony, pg/L 5 Quarterly Grab Effluent
Total Chromium 5.6 200 ig/L 200 pg/L 2/Month Grab Effluent
Total Copper 5 Quarterly Grab Effluent
Total Nickel, pg/L 5 Quarterly Grab Effluent
Total Zinc 5.6 1,000 pg/L 1,000 pg/L 2/Month Grab Effluent
Total Fluoride, mg/L Quarterly Grab Effluent
Chloroform, pg/L ' Quarterly Grab Effluent
Chronic Toxicity 8 P/F @ 0.1% Quarterly Grab Effluent
The 126 priority pollutants
except Total Chromium and No detectable amount Annually Grab Effluent
Total Zinc 5.6
Footnotes:
1. Effluent sampling shall be conducted below the final treatment unit and prior to mixing with any other
waste streams. Intake means the facility's raw water intake.
2. Upon completing at least three consecutive months of daily pH readings,the Permittee may request that
pH monitoring be reduced to Weekly.Such request should demonstrate to the Division's satisfaction that
the results of weekly monitoring will adequately represent the measure and variability of effluent pH. If a
Page 3 of 18

NC0004774
request was approved for Outfall 001A,the approval may be extended to Outfall 006 without requiring
resubmittal of the request.
3. Total Nitrogen=NO2-N+NO3-N+TKN
4. The Division shall consider all effluent TRC values reported below 50 µg/L to be in compliance with the
permit. However,the permittee shall continue to record and submit all values reported by a North
Carolina certified laboratory(including field certified),even if these values fall below 50 µg/L. Neither
free available chlorine(FAC)nor TRC may be discharged from any single generating unit for more than
two hours in any single day,and not more than one unit in the plant may discharge FAC or TRC,unless
the discharger demonstrates to the Division that the unit(s)cannot operate at or below this level of
chlorination.
5. See Special Condition A.(12.)Metals Analyses.
6. See Special Condition A.(13.)Priority Pollutant Limitations and Analysis.
7. See paragraph(f)of this condition.
8. See Special Condition A.(14.)Chronic Toxicity Permit Limit.
b. Authorized waste flows from the CTCC Plant are potable,service,and process water
treatment wastes;floor drain wastes;cooling tower blowdown;heat recovery steam generator
(HRSG)and auxiliary boiler blowdowns;and stormwater flows draining to the sump.Such
waste flows shall not pass through the ash settling pond prior to discharge.
c. There shall be no discharge of metal cleaning waste or chemical metal cleaning waste.
d. There shall be no discharge of floating solids or visible foam in other than trace amounts.
e. The Permittee shall analyze a representative sample of the CTCC Plant Wastewater Sump
discharge and submit a complete and accurate EPA Application Form 2C for the sump
discharge no later than 180 days from the beginning of the discharge.
f. If the initial chloroform analysis is conducted while this condition is effective,and if the initial
analysis does not yield a reportable concentration of chloroform(PQL<2.0 lig/L),chloroform
monitoring specified in paragraph(a)of this condition is waived for the remainder of the
permit term.
g. The mixing zone for thermal discharges from the Buck facility is defined as that portion of the
Yadkin River(High Rock Lake)extending from the Buck Combined Cycle Station water intake
to High Rock Lake Dam.The thermal variance and mixing zone terminate on expiration of this
permit.The Director may reopen the permit to extend or modify the variance based on the
findings of the Thermal Mixing Zone Study(see Special Condition C.(13.))or other new
information.
h. When High Rock Lake,as measured at the intake of the Buck Combined Cycle Station,is
drawn down 10 feet or greater,the Permittee shall on a daily average basis ensure that the
minimum unheated daily average stream flow does not fall below one third of the 7-day 10-
year low flow(7Q10).
A.(2.) INTAKE SCREEN BACKWASH
[15A NCAC 02H.0106(f)(2)]
Backwash from the Buck raw water intake screens is deemed permitted provided that no water
quality standards are contravened or expected to be contravened.
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NC0004774
A.(3.) MONITORING REQUIREMENTS (Internal Outfall 008- Coal Ash Beneficiation
Plant)
[15A NCAC 02B .0400 et seq.,02B .0500 et seq.]
a. No later than 180 days after startup of the Coal Ash Beneficiation Plant,the Permittee shall
monitor the waste flows discharged to the CTCC wastewater system as specified below:
EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
PARAMETER Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location 1
Daily
2
Pump logs,
Flow, MGD (first year) similar readings,or Effluent
estimate
pH,S.U. Once Grab Effluent
Total Suspended Solids, mg/L Once Grab Effluent
Oil and Grease, mg/L Once Grab Effluent
Total Dissolved Solids, mg/L Once Grab Effluent
Chlorides, mg/L Once Grab Effluent
Sulfates, mg/L Once Grab Effluent
Total Hardness, mg/L as CaCO3 Once Grab Effluent
Total Arsenic, pg/L 3 Once Grab Effluent
Total Selenium, pg/L 3 Once Grab Effluent
Total Copper, pg/L 3 Once Grab Effluent
Total Lead, pg/L 3 Once Grab Effluent
Total Nickel, pg/L 3 Once Grab Effluent
Total Thallium, pg/L 3 Once Crab Effluent
Total Zinc, pg/L 3 Once Grab Effluent
Footnotes:
1. Samples shall be collected at a point downstream of the final Beneficiation Plant treatment unit and prior
to comingling with any other waste streams.Samples shall be representative of the waste flow from the
plant.
2. See Special Condition A.(16.)Flow Monitoring and Reporting.
3. See Special Condition A.(12.)Metals Analyses.
b. The Permittee shall report the monitoring results on the appropriate DMR.
c. The Permittee shall notify the Division in writing no later than seven calendar days prior to
start-up of the Beneficiation Plant;see Special Condition A.(8.) Notifications and Submittals.
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NC0004774
A.(4.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 007-
Ash Pond Dewatering)
[15A NCAC 02B .0400 et seq.,02B .0500 et seq.]
a. During the period beginning with the start of ash pond dewatering and diversion of
dewatering discharges to Outfall 007 and lasting until permit expiration,the Permittee is
authorized to discharge treated ash dewatering waste flows from Outfall 007.Such discharges
shall be limited and monitored by the Permittee as specified below:
EFFLUENT LIMITATIONS MONITORING REQUIREMENTS'.
PARAMETER
Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location
Flow 1.2 MGD Daily Pump Logs or Effluent
similar readings
pH 2 >_ 6.0 and <_ 9.0 standard units Daily Grab Effluent
Total Nitrogen, mg/L 3 Weekly Grab Effluent
Total Phosphorus, mg/L Weekly Grab Effluent
Total Suspended Solids 4 23.0 mg/L 74.0 mg/L Weekly Grab Effluent
Oil and Grease 11.0 mg/L 15.0 mg/L Weekly Grab Effluent
Total Dissolved Solids, mg/L Weekly Grab Effluent
Turbidity, NTU 5 Weekly Grab Effluent
Chlorides, mg/L Weekly Grab Effluent
Total Hardness, mg/L as CaCO3 Weekly Grab Effluent
Total Arsenic, ug/L 6 Weekly Grab Effluent
Total Selenium, ug/L 6 Weekly Grab Effluent
Total Mercury, ng/L 6 Weekly Grab Effluent
Total Antimony, pg/L 6 Weekly Grab Effluent
Total Copper, ug/L 6 Weekly Grab Effluent
Total Chromium,ug/L 6 Weekly Grab Effluent
Total Lead, pg/L 6 Weekly Grab Effluent
Total Nickel, pg/L 6 Weekly Grab Effluent
Total Thallium, pg/L 6 Weekly Grab Effluent
Chronic Toxicity ' P/F @ 0.17% Monthly Grab Effluent
Footnotes:
1. Effluent sampling shall be conducted at the discharge from the ash settling pond or,if additional treatment
is provided,below the final treatment unit,and prior to mixing with any other waste streams.
2. The Permittee shall continuously monitor pH when the dewatering process commences(and one or more
pumps is operating),and the dewatering pump(s)shall be shut off immediately when the 15-minute
running average pH falls below 6.1 or rises above 8.9 S.U.Pumping will be allowed to continue if
interruption might result in dam failure or damage.
3. Total Nitrogen=NO2-N+ NO3-N+TKN
4. The Permittee shall continuously monitor TSS concentration when the dewatering process commences
(and one or more pumps is operating),and the dewatering pump(s)shall be shut off automatically when
the 15-minute running average TSS exceeds one half of the Daily Maximum TSS limit.Pumping will be
allowed to continue if interruption might result in dam failure or damage.
5. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 25 NTU. If the
instream turbidity exceeds 25 NTU due to natural background conditions,the discharge shall not cause
turbidity to increase in the receiving stream. Therefore,if the effluent turbidity exceeds 25 NTU,the
Permittee shall sample upstream and downstream turbidity in the receiving waterbody,within 24 hours,
to determine whether the turbidity level in the receiving waterbody was increased. All data shall be
reported on the DMRs. (See 15A NCAC 2B.0211 (21)).
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NC0004774
6. See Special Condition A.(12.)Metals Analyses.
7. See Special Condition A.(14.)Chronic Toxicity Permit Limit.
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
c. If any one of these pollutants(As,Se,Hg,Sb,Cu,Pb,Ni,and TI)reaches 85% of the allowable
monthly average effluent discharge concentration during dewatering,the Permittee shall
immediately discontinue discharge of the wastewater and report the event to DWR
Mooresville Regional Office and Complex NPDES Permitting via telephone and e-mail.
85%of Allowable Monthly Average Effluent Concentrations
As Se Hg Sb Cu Pb Ni TI
37.8 mg/L 3.9 mg/L 9.4 pg/L 4.4 mg/L 6.2 mg/L 2.3 mg/L 19.6 mg/L 0.27 mg/L
d. In the event that additional waters accumulate in the pond(s),the rate for lowering the liquid
level in a coal ash pond shall not exceed one(1)foot per day unless a higher rate is supported
to the satisfaction of DEMLR and in accordance with NCAC,Title 15A,Subchapter 2K.The
facility shall use a floating pump suction pipe with free water skimmed from the basin surface
using an adjustable weir.See also paragraph(a),Footnotes 2 and 4,above.
e. Conditions B.(1.) through B.(4.) are not intended to authorize concurrent waste discharges
through both Outfalls 002 and 007 except as necessary to make an orderly transition to the new
outfall.The Permittee shall cease discharge at Outfall 002 as soon as practical after Outfall 007
is operational.
Page 7 of 18

NC0004774
A.(5.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 111 -
Constructed Seep)
[15A NCAC 02B .0400 et seq.,02B .0500 et seq.]
a. During the period beginning on the effective date of this permit and lasting until expiration,
the Permittee is authorized to discharge seepage from Outfa11111 (35.707126,-80.374034).Such
discharges shall be limited and monitored by the Permittee as specified below:
EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
PARAMETER
Monthly Daily Measurement Sample Sample
Average Maximum Frequency 1 Type Location 2
Flow, MGD 3 Monthly/Quarterly Estimate Effluent
pH >_ 6.0 and <_ 9.0 standard units Monthly/Quarterly Grab Effluent
Temperature, °C Monthly/Quarterly Grab Effluent
Total Suspended Solids 30.0 mg/L 100.0 mg/L Monthly/Quarterly Grab Effluent
Oil and Grease 15.0 mg/L 20.0 mg/L Monthly/Quarterly Grab Effluent
Total Dissolved Solids, mg/L 500 mg/L 500 mg/L Monthly/Quarterly Grab Effluent
Conductivity, pmho/cm Monthly/Quarterly Grab Effluent
Chlorides, mg/L Monthly/Quarterly Grab Effluent
Fluoride, mg/L Monthly/Quarterly Grab Effluent
Nitrate/nitrite as N, mg/L Monthly/Quarterly Grab Effluent
Sulfates, mg/L Monthly/Quarterly Grab Effluent
Total Hardness, mg/L as CaCO3 Monthly/Quarterly Grab Effluent
Total Arsenic, pg/L 4 Monthly/Quarterly Grab Effluent
Total Selenium, pg/L 4 Monthly/Quarterly Grab Effluent
Total Mercury, ng/L 4 Monthly/Quarterly Grab Effluent
Total Aluminum, mg/L4 Monthly/Quarterly Grab Effluent
Total Barium, mg/L 4 Monthly/Quarterly Grab Effluent
Total Cadmium, pg/L 4 Monthly/Quarterly Grab Effluent
Total Chromium, pg/L 4 Monthly/Quarterly Grab Effluent
Total Copper, pg/L 4 Monthly/Quarterly Grab Effluent
Total Lead, ug/L 4 Monthly/Quarterly Grab Effluent
Total Manganese, mg/L 4 Monthly/Quarterly Grab Effluent
Total Nickel, pg/L 4 Monthly/Quarterly Grab Effluent
Total Thallium, pg/L 4 Monthly/Quarterly Grab Effluent
Total Zinc, ug/L 4 Monthly/Quarterly Grab Effluent
Footnotes:
1. Beginning on the effective date of the permit,the Permittee shall monitor at least 1/month for one year and
1/quarter thereafter.
2. Sampling shall be conducted at the discharge point prior to mixing with any other waste streams.The
discharge point is as defined in the October 2014 Buck Steam Station Ash Basin Surface Water and Seep
Monitoring report or as approved in writing by the Director.
3. See Special Condition A.(16.)Flow Monitoring and Reporting regarding reporting flow when no discharge
occurs or the Permittee is unable to obtain a representative sample due to low-flow conditions at the toe
drain.
4. See Special Condition A.(12.) Metals Analyses.
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
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NC0004774
A.(6.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 117-
Constructed Seep)
[15A NCAC 02B .0400 et seq.,02B .0500 et seq.]
a. During the period beginning on the effective date of this permit and lasting until expiration,
the Permittee is authorized to discharge seepage from Outfa11117(35.7058,-80.3753).Such
discharges shall be limited and monitored by the Permittee as specified below:
EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
PARAMETER
Monthly Daily Measurement Sample Sample
Average Maximum Frequency 1 Type Location 2
Flow, MGD 3 Monthly/Quarterly Estimate Effluent
pH >_ 6.0 and <_ 9.0 standard units Monthly/Quarterly Grab Effluent
Temperature, °C Monthly/Quarterly Grab Effluent
Total Suspended Solids 30.0 mg/L 100.0 mg/L Monthly/Quarterly Grab Effluent
Oil and Grease 15.0 mg/L 20.0 mg/L Monthly/Quarterly Grab Effluent
Total Dissolved Solids, mg/L 500 mg/L 500 mg/L Monthly/Quarterly Grab Effluent
Conductivity, pmho/cm Monthly/Quarterly Grab Effluent
Chlorides, mg/L Monthly/Quarterly Grab Effluent
Fluoride, mg/L Monthly/Quarterly Grab Effluent
Nitrate/nitrite as N, mg/L Monthly/Quarterly Grab Effluent
Sulfates, mg/L Monthly/Quarterly Grab Effluent
Total Hardness, mg/L as CaCO3 Monthly/Quarterly Grab Effluent
Total Arsenic, pg/L 4 Monthly/Quarterly Grab Effluent
Total Selenium, pg/L 4 Monthly/Quarterly Grab Effluent
Total Mercury, ng/L 4 Monthly/Quarterly Grab Effluent
Total Aluminum 4 6.5 mg/L 6.5 mg/L Monthly/Quarterly Grab Effluent
Total Barium, mg/L 4 Monthly/Quarterly Grab Effluent
Total Cadmium, pg/L 4 Monthly/Quarterly Grab Effluent
Total Chromium, pg/L 4 Monthly/Quarterly Grab Effluent
Total Copper, pg/L 4 Monthly/Quarterly Grab Effluent
Total Lead, ug/L 4 Monthly/Quarterly Grab Effluent
Total Manganese, mg/L 4 Monthly/Quarterly Grab Effluent
Total Nickel, pg/L 4 Monthly/Quarterly Grab Effluent
Total Thallium, pg/L 4 Monthly/Quarterly Grab Effluent
Total Zinc, ug/L 4 Monthly/Quarterly Grab Effluent
Footnotes:
1. Beginning on the effective date of the permit,the Permittee shall monitor at least 1/month for one year and
1/quarter thereafter.
2. Sampling shall be conducted at the discharge point prior to mixing with any other waste streams.The
discharge point is as defined in the October 2014 Buck Steam Station Ash Basin Surface Water and Seep
Monitoring report or as approved in writing by the Director.
3. See Special Condition A.(16.)Flow Monitoring and Reporting regarding reporting flow when no discharge
occurs or the Permittee is unable to obtain a representative sample due to low-flow conditions at the toe
drain.
4. See Special Condition A.(12.)Metals Analyses.
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
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NC0004774
A.(7.) DEFINITIONS
[15A NCAC 02B .0406(b)]
a. The term low volume waste sources means wastewater from all sources except those for which
specific limitations are otherwise established in 40 CFR 423.11 (b).
b. The term chemical metal cleaning waste means any wastewater resulting from cleaning any metal
process equipment with chemical compounds,including,but not limited to,boiler tube
cleaning(40 CFR 423.11 (c)).
c. The term metal cleaning waste means any wastewater resulting from cleaning [with or without
chemical cleaning compounds] any metal process equipment including,but not limited to,
boiler tube cleaning,boiler fireside cleaning,and air preheater cleaning(40 CFR 423.11 (d)).
A.(8.) NOTIFICATIONS AND SUBMITTALS
[G.S. 143-215.1(b)]
a. Unless specified otherwise,the Permittee shall provide,in writing,notifications required by
this permit to:
Division of Water Resources Division of Water Resources
WQ Permitting Section-NPDES Water Quality Supervisor
Attn: Duke Energy Permits Specialist Mooresville Regional Office
1617 Mail Service Center 610 East Center Avenue,Suite 301
Raleigh,NC 27699-1617 Mooresville,NC 28115
b. Unless specified otherwise,the Permittee shall submit all study plans,study results,and
related materials or information required by this permit as follows:
Electronic Version Only: Electronic Version and Hard Copy:
Division of Water Resources Division of Water Resources
WQ Permitting Section-NPDES Water Sciences Section
Attn: Duke Energy Permits Specialist 1624 Mail Service Center
1617 Mail Service Center Raleigh,NC 27699-1623
Raleigh,NC 27699-1617
c. Electronic copies shall be PDF files recorded on compact discs (CDs),or as approved by the
Division.
A.(9.) CHEMICAL DISCHARGES
[G.S. 143-215.1(b)]
a. Hazardous Wastes.
i. The Permittee shall continue to implement a Best Management Practices (BMP) Plan to
control the discharge of oils and the hazardous and toxic substances listed in 40 CFR Part
117 and Tables II and III of Appendix D to 40 CFR Part 122,and shall maintain a current
copy of the Plan at the plant site and make such copy available for inspection by EPA
and DWR personnel.
ii. Discharge of any waste resulting from the combustion of toxic or hazardous waste to any
waste stream which ultimately discharges to waters of the United States is prohibited,
unless specifically authorized in this permit.
b. PCBs. There shall be no discharge of polychlorinated biphenyl(PCB)compounds such as
those once commonly used for transformer fluid.
c. Metal Cleaning Waste. There shall be no discharge of metal cleaning waste or chemical metal
cleaning waste.
Page 10 of 18

NC0004774
d. FIFRA-Registered Products. Discharge of any product registered under the Federal
Insecticide,Fungicide,and Rodenticide Act to any waste stream which may ultimately be
released to lakes,rivers,streams or other waters of the United States is prohibited unless
specifically authorized elsewhere in this permit.
e. Pesticides. Use of restricted-use pesticides for lake management purposes by applicators
licensed by the N.C.Pesticide Board is allowed provided that the treatment is conducted
according to label restrictions and other applicable requirements.
f. Chlorine. Discharge of chlorine from the use of chlorine gas,sodium hypochlorite,or other
similar chlorination compounds for disinfection in plant potable and service water systems is
authorized subject to the conditions of this permit.
A.(10.) DISCHARGES OF OTHER MATERIALS
[G.S.143-215.1(b);15A NCAC 02B.0400 et seq.]
a. There shall be no discharge of floating solids or visible foam in other than trace amounts.The
Permittee shall report such discharges,if observed in other than trace amounts,in the
comments section of the appropriate DMR.
b. The Permittee shall report all visible discharges of floating materials(such as an oil slick)in the
comments section of the appropriate DMR.
c. The Permittee shall report the presence of cenospheres observed in any samples,in the
comments section of the appropriate DMR.
A.(11.) BIOCIDE CONDITION
[15A NCAC 02B.0200 et seq.]
The Permittee shall not use any biocides except those approved in conjunction with the permit
application.The Permittee shall notify the Director in writing not later than ninety(90)days prior to
instituting use of any additional biocide used in cooling systems which may be toxic to aquatic life
other than those previously reported to the Division.Such notification shall include completion of
Biocide Worksheet Form 101 and a map locating the discharge point and receiving stream.
Completion of Biocide Worksheet Form 101 is not necessary for the introduction of a new biocide
into an outfall currently being tested for toxicity.
A.(12.) METALS ANALYSES
[G.S.143-215.1(b)]
Metals analyses shall be performed using EPA methods 200.7 or 200.8(or the most current versions)
except that mercury analyses shall be performed using EPA method 1631E.
A.(13.) PRIORITY POLLUTANT LIMITATIONS AND ANALYSES
[G.S.143-215.1(b)]
Limitations and monitoring requirements for the 126 Priority Pollutants(per 40 CFR Part 423,
Appendix A,exclusive of zinc and chromium)apply only if these substances are added by the
permittee for cooling tower maintenance. Compliance with the limitations for the 126 priority
pollutants in 40 CFR 423.13(d)(1)may be determined by engineering calculations which
demonstrate that the regulated pollutants are not detectable in the final discharge by the analytical
methods in 40 CFR Part 136. All primary industries are required to submit a priority pollutant
analysis in accordance with 40 CFR Part 122 with their application for permit renewal.
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NC0004774
A.(14.) CHRONIC TOXICITY PERMIT LIMIT(Monthly/Quarterly)
[15A NCAC 02B.0200 et seq.]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant
mortality to Ceriodaphnia dubia at an effluent concentration of 0.1%or 0.17%,as specified for the
discharge in Effluent Pages of this permit.
The permit holder shall perform,at a minimum,quarterly or monthly monitoring,as specified for the
discharge in Sections A and B,using test procedures outlined in the"North Carolina Ceriodaphnia
Chronic Effluent Bioassay Procedure,"Revised December 2010,or subsequent versions or"North
Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised-December 2010)or
subsequent versions.The tests will be performed during the months of March,June,September,
and December if quarterly testing is specified;these months signify the first month of each three-
month toxicity testing quarter assigned to the facility.The tests will be performed during each
calendar month if monthly testing is specified.Effluent sampling for this testing must be obtained
during representative effluent discharge and shall be performed at the NPDES permitted final
effluent discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter or month results in a failure
or ChV below the permit limit,then multiple-concentration testing shall be performed at a
minimum,in each of the two following months as described in"North Carolina Phase II Chronic
Whole Effluent Toxicity Test Procedure" (Revised-December 2010)or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form(MR-1)for the months in which tests were performed,using the
parameter code TGP3B for the pass/fail results and THP3B for the Chronic Value. Additionally,
DWR Form AT-3(original)is to be sent to the following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,NC 27699-1621
Or,results can be sent to the email,ATForms.ATBAncdentgov.
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than
40 days after the end of the reporting period for which the report is made.
Test data shall be complete,accurate,include all supporting chemical/physical measurements and
all concentration/response data,and be certified by laboratory supervisor and ORC or approved
designate signature. Total residual chlorine of the effluent toxicity sample must be measured and
reported if chlorine is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring
is required,the permittee shall complete the information located at the top of the aquatic toxicity
(AT)test form indicating the facility name,permit number,pipe number,county,and the
month/year of the report with the notation of"No Flow"in the comment area of the form. The
report shall be submitted to the Water Sciences Section at the address cited above.
Should the permittee fail to monitor during a month in which quarterly toxicity monitoring is
required,monitoring will be required during the following month. Assessment of quarterly toxicity
compliance is based on the toxicity testing quarter,which is the three-month time interval that
begins on the first day of the month in which toxicity testing is required by this permit and
continues until the final day of the third month.
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NC0004774
Should any test data from this monitoring requirement or tests performed by the North Carolina
Division of Water Resources indicate potential impacts to the receiving stream,this permit may be
re-opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum
control organism survival,minimum control organism reproduction,and appropriate
environmental controls,shall constitute an invalid test and will require immediate follow-up
testing to be completed no later than the last day of the month following the month of the initial
monitoring.
A.(15.) WASTE TREATMENT MODIFICATIONS
[G.S. 143-215.1(b)]
The Permittee shall notify the Division no later than 14 calendar days prior to start-up of any
substantial modifications to waste treatment units or operations at the CTCC Plant,including the
addition of the proposed waste holding basin or other new treatment units or operations. In such
cases,the Permittee shall also provide a written description of the nature and purpose of the
modifications,a revised flow schematic and water balance,if appropriate,and other such
information as necessary to maintain an accurate permit application in the NPDES files;see Special
Condition A.(8.) Notifications and Submittals.
A.(16.) FLOW MONITORING AND REPORTING
[15A NCAC 02B .0200 et seq.]
All flows shall be reported on monthly DMRs. Should no flow occur during a given month, the
Permittee shall submit its DMR,as required,and indicate"No Flow" for the seep on the DMR form
(15A NCAC 02B .0506(a)(1)(E)).
A.(17.) INSTREAM MONITORING
[G.S. 143-215.66]
a. The Permittee shall conduct monthly instream monitoring (approximately 4,000 ft. upstream
and approximately 2,500 feet downstream of Outfall 007) 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 total dissolved
solids (TDS).Sampling periods and the samples collected shall be representative of the surface
waters and facility operations.Sampling locations may be modified with the written approval
of the Division in order to provide representative results.
b. The Permittee shall report instream monitoring results on its Discharge Monitoring Reports
and include a copy with its NPDES permit renewal application.
c. Instream monitoring by the permittee is provisionally waived considering the permittee's
participation in the Yadkin/ Pee Dee River Basin Association provided the Association agrees
to sample for all the parameters listed in this condition and at the specified locations and
frequencies. Instream monitoring shall be conducted as stated in this permit should the
permittee end its participation in the Association.
A.(18.) FISH TISSUE MONITORING NEAR ASH POND DISCHARGE (Outfalls 002/007)
[G.S. 143-215.66]
The Permittee shall conduct fish tissue monitoring annually and submit the results with the NPDES
permit renewal application.The objective of this monitoring is to evaluate potential uptake of
pollutants by fish tissue near the ash pond discharge. The parameters analyzed in fish tissue shall
include arsenic,selenium,and mercury.The monitoring shall be conducted in accordance with the
Page 13 of 18

NC0004774
sampling plan approved by the Division.The plan should be submitted to the Division within 180
days from the effective date of the permit. Upon approval,the plan becomes an enforceable part of
the permit.
A.(19.) CLEAN WATER ACT SECTION 316(a) THERMAL VARIANCE
[15A NCAC 02B .0226]
a. The thermal variance granted under Section 316(a)terminates upon permit expiration.
b. The Permittee shall conduct such studies as are necessary to determine the extent of any
mixing zone required for the Buck facility's thermal discharge.The findings and
recommendations shall be submitted no later than April 30,2022.
c. The Permittee may request a continuation of the 316(a)thermal variance beyond the term of
this permit. Reapplication for such continuation shall be submitted in accordance with 40 CFR
Part 125,Subpart H,and Section 122.21(m)(6)no later than April 30,2022. Reapplication shall
include justification for the continuation.
d. Any studies required to satisfy paragraphs(b.)or(c.) shall be performed in accordance with a
Division of Water Resources-approved plan. The temperature analysis and the balanced and
indigenous study plan shall conform to the specifications outlined in 40 CFR 125 Subpart H,
the EPA's Draft 316(a)Guidance Manual,dated 1977,and the Region 4 letter to NCDENR,
dated June 3,2010. EPA shall be provided an opportunity to review the plan prior to the
commencement of the study.
e. The Permittee shall submit copies of the study plan and study plan requests,study results,and
any other applicable materials to the Division as specified in Special Condition A.(8.)
Notifications and Submittals.
A.(20.) CLEAN WATER ACT SECTION 316(b) INTAKE STRUCTURE REQUIREMENTS
[40 CFR Part 125,Subpart J]
a. The Director has tentatively determined that operation of the CTCC plant's closed-cycle
recirculating system is sufficient to satisfy the Best Technology Available(BTA) standards per
40 CFR Part 125,Subpart J. Full approval is contingent upon the Permittee's submittal and the
Director's acceptance of additional information documenting the adequacy of the BTA
measures.
b. No later than April 30,2022,the Permittee shall submit to the Division,as specified in Special
Condition A.(8.)Notifications and Submittals,all additional information required of it by 40
CFR 122.21(r).
c. Nothing in this permit authorizes take for the purposes of a facility's compliance with the
Endangered Species Act.
A.(21.) ASH POND OPERATIONS AND MAINTENANCE
[G.S. 143-215.1(b)]
a. Structural Integrity Inspections of Ash Dams. The facility shall meet the dam design and dam
safety requirements per 15A NCAC 02K.
b. Working Capacity.
i. Beginning on the effective date of this permit and lasting until expiration,there shall be
no discharge of plant wastes to the ash pond unless the Permittee provides and
maintains at all times a minimum free water volume equivalent to the sum of the
maximum 24-hour plant discharges plus all direct rainfall and all runoff flows to the
Page 14 of 18

NC0004774
pond resulting from a 10-year,24-hour rainfall event,when using a runoff coefficient of
1.0.
ii. During the term of the permit,the Permittee shall remove settled material from the
ponds or otherwise enlarge the available storage capacities in order to maintain the
required minimum volumes at all times.
iii. Annually,the Permittee shall determine and report to the permit issuing authority: (1)
the actual free water volume of the ash pond, (2) physical measurements of the
dimensions of the free water volume in sufficient detail to allow validation of the
calculated volume,and (3)a certification that the required volume is available with
adequate safety factor to include all solids expected to be deposited in the ponds for the
following year. Any changes to plant operations affecting such certification shall be
reported to the Director within five days.
iv. In the event that adequate volume has been certified to exist for the term of the permit,
periodic certification is not needed.
c. Closure. The Permittee shall prepare an Ash Pond Closure Plan in anticipation of the facility
closure.This Plan shall be submitted to the Division no later than one year prior to the closure
of the facility.
d. Closure Agreement. Duke Energy shall continue the process of closing the coal ash surface
impoundments at Buck,to be completed by December 31,2035,through the process of
beneficiation as described in the mediated settlement agreement reached in Case No. 1:14-cv-
753-LCB-JEP(September 28,2016)from the United States District Court for the Middle District
of North Carolina. Completion of these closure activities will eliminate the seeps from the ash
basins at Buck. Within 180 days of completion of all surface impoundment closure activities at
Buck,the facility shall determine if a seep meets the applicable state water quality standards
established in 15 N.C.A.C.2B .0200 and submit the results of this determination to the Division
of Water Resources for evaluation.
A.(22.) APPLICABLE STATE LAW(State-Enforceable Only)
[G.S. 143-215.1(b)]
The Permittee shall meet the General Statute requirements under G.S. 130A-309.200,et seq. This
permit may be reopened to include new requirements imposed under these statutes.
A.(23.) GROUNDWATER COMPLIANCE BOUNDARY
[15A NCAC 02L.0107]
The compliance boundary for the disposal system shall be specified in accordance with 15A NCAC
02L.0107(a)or(b),dependent upon the date permitted.The compliance boundary map for this
facility is incorporated herein and attached hereto as Attachment A. An exceedance of groundwater
standards at or beyond the compliance boundary is subject to remediation action according to 15A
NCAC 02L.0106(c), (d),or (e) as well as enforcement actions in accordance with North Carolina
General Statute 143-215.6A through 143-215.6C.
A.(24.) NO WAIVER OF RIGHTS
[G.S. 143-215.1(b)]
Nothing contained in this permit shall be construed as a waiver by the Permittee of any right to a
hearing it may have pursuant to State or Federal laws or regulations.
Page 15 of 18

NC0004774
A.(25.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
[G.S. 143-215.1(b)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs)and
program reports.The final NPDES Electronic Reporting Rule was adopted and became effective on
December 21,2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of
this permit(Standard Conditions for NPDES Permits):
• Section B. (11.) Signatory Requirements
• Section D. (2.) Reporting
• Section D. (6.) Records Retention
• Section E. (5.) Monitoring Reports
1. Reporting Requirements[Supersedes Part II,Section D. (2.) and Section E. (5.)(a))
The permittee shall report discharge monitoring data electronically using the NC DWR's
Electronic Discharge Monitoring Report(eDMR)internet application.
Monitoring results obtained during the previous month(s) shall be summarized for each month
and submitted electronically using eDMR. The eDMR system allows permitted facilities to enter
monitoring data and submit DMRs electronically using the internet. Until such time that the
state's eDMR application is compliant with EPA's Cross-Media Electronic Reporting Regulation
(CROMERR),permittees will be required to submit all discharge monitoring data to the state
electronically using eDMR and will be required to complete the eDMR submission by printing,
signing,and submitting one signed original and a copy of the computer printed eDMR to the
following address:
NC DEQ/ Division of Water Resources / Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
Page 16 of 18

NC0004774
1. Reporting Requirements(cont.)
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(MR 1,
1.1,2,3)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.
Regardless of the submission method,the first DMR is due on the last day of the month
following the issuance of the permit or in the case of a new facility,on the last day of the month
following the commencement of discharge.
Starting on December 21,2020,the permittee must electronically report the following
compliance monitoring data and reports,when applicable:
• Sewer Overflow/Bypass Event Reports;
• Pretreatment Program Annual Reports;and
• Clean Water Act(CWA)Section 316(b)Annual Reports.
The permittee may seek an electronic reporting waiver from the Division(see"How to Request a
Waiver from Electronic Reporting" section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9),the permittee must identify the initial recipient at the
time of each electronic submission. The permittee should use the EPA's website resources to
identify the initial recipient for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the
entity(EPA or the state authorized by EPA to implement the NPDES program)that is the
designated entity for receiving electronic NPDES data [see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool
for each type of electronic submission and for each state. Instructions on how to access and use
the appropriate electronic reporting tool will be available as well. Information on EPA's NPDES
Electronic Reporting Rule is found at:
https://www.federalregister.gov/documents/2015/10/22/2015-24954/national-pollutant-
discharge-elimination-system-npdes-electronic-reporting-rule
Electronic submissions must start by the dates listed in the"Reporting Requirements" section
above.
3. How to Request a Waiver from Electronic Reporting
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 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
Page 17 of 18

NC0004774
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.
Information on eDMR and the application for a temporary electronic reporting waiver are found
on the following web page: http://deq.nc.gov/about/divisions/water-resources/edmr
4. Signatory Requirements[Supplements Part II, Section B. (11.)(b) and Supersedes Section B.
(11.)(d)1
All eDMRs submitted to the permit issuing authority shall be signed by a person described in
Part II,Section B.(11.)(a)or by a duly authorized representative of that person as described in
Part II,Section B. (11.)(b).A person,and not a position,must be delegated signatory authority
for eDMR reporting purposes.
For eDMR submissions,the person signing and submitting the DMR must obtain an eDMR user
account and login credentials to access the eDMR system. For more information on North
Carolina's eDMR system,registering for eDMR and obtaining an eDMR user account,please
visit the following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system 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."
5. Records Retention[Supplements Part II,Section D. (6.)1
The permittee shall retain records of all Discharge Monitoring Reports,including eDMR
submissions.These records or copies shall be maintained for a period of at least 3 years from the
date of the report.This period may be extended by request of the Director at any time [40 CFR
122.41].
Page 18 of 18

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Duke Energy— Buck Steam Station
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441111111011
' N NC0004774
County: Rowan
SCALE o Receiving Stream: Yadkin River(High Rock Lake)
Stream Classif++cation: WS-V
USGS Quad #: E17NW, E17NE 1:24,000 River Basin: Yadkin-Pee Dee
Lat. 35.70716° Long. -80.37515° (1"=2000') Sub-Basin/8-Digit HUC#:03-07-06/ 03040102