NC0004774_Draft Permit_20180511

ROY COOPER
(i'I(,,,un,•
MICHAEL S. REGAN
LINDA CULPEPPER
Water Resources
hit( oil l)irctror
ENVIRONMENTAL QUALITY
May 11,2018
Mr. Paul Draovitch,Senior Vice President EH&S
Duke Energy Carolinas,LLC
526 Church St.
Mail Code: EC3XP
Charlotte, North Carolina 28202
Subject: Draft NPDES Permit Renewal
Permit NC0004774
Buck Combined Cycle Station
Grade PC-1 Facility,SIC 4911
Rowan County
Dear Mr. Hausle:
The Division has reviewed Duke Energy's February 26,2016,application,revised applications,
and supplemental information for renewal of the subject NPDES permit.The Division has made
a tentative determination to reissue the permit,with modifications, and is enclosing the draft
permit for your review and comment. Please review this draft carefully to ensure a thorough
understanding of the requirements and conditions it contains.
At this time, the Division is submitting a notice to the newspaper of general circulation in
Rowan County (the Salisbury Post) inviting public comment on the draft permit and providing
notice of a public hearing to be held Wednesday,June 13,2018,at the Rowan County
Cooperative Extension in Salisbury, NC.The notice is scheduled for publication on or about
May 13. The public comment period begins upon publication and will extend through
Wednesday,June 20. Following the close of the comment period, the Division will consider all
pertinent comments received before taking final action on the proposed permit.
Please provide any comments you have regarding the draft permit to this office,in writing,
no later than the close of the comment period: Wednesday,June 20,2018.
The draft permit includes significant changes from the existing permit,including the following:
• Deletion of Outfall 001,previously used for once-through cooling waters but now inactive.
• Addition of new water quality-based effluent limitations for
• Addition of new effluent limitations and monitoring requirements for:
• ash pond discharges to Outfall 002, due to lack of consistent flows in this portion of the
river channel;limits will become effective six months after the effective date of the
permit;
• proposed Outfalls OO1A and 006 for the diversion of all waste discharges from the CTCC
to the Yadkin River mainstem;
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center Raleigh,North Carolina 27699-1617
919 807 6300

Draft NPDES Permit Renewal
May 11, 2018
• Outfall 002 for the discharge of decanting and dewatering wastes from the ash basins to
the existing outfall;
• proposed Outfall 007 for the diversion of decanting and dewatering waste discharges to
the Yadkin River mainstem;and
• discharge from ash basin constructed seeps, designated as Outfalls 111 and 117.
• Updating of conditions regarding Clean Water Act 316(a) (temperature) and 316(b) (intake
structure) variances.
• Removal of the Special Condition for Metal Cleaning Wastes,which are no longer
discharged.
• Addition of new water quality-based limits based on the dissolved metals standards,
including hardness-dependent standards.
• Addition of Total Hardness monitoring at Outfalls 002, 001A,006, and 007 to implement
new dissolved metals standards.
• Addition of an Applicable State Law special condition to acknowledge the Coal Ash
Management Act and Senate Bill 729.
• Addition of a new condition to reflect the EPA's final NPDES Electronic Reporting Rule,
which became effective December 21,2015.
If you have any questions concerning the draft permit, please contact me at(919) 807-6402 or
[e-mail].
Sincerely,
Michael E.Templeton,P.E.
Water Quality Permitting Section
Enclosure: Draft Permit and Fact Sheet,NC0004774
Copies(with encl.): NPDES Files
eCopies(with end.): Richard Baker,Duke Energy
Shannon Langley,Duke Energy
Elizabeth Glenn,Duke Energy
NPDES Permitting Section,EPA Region IV
Corey Basinger,Mooresville Regional Office,Surface Water Protection
Clinton Cook,Mooresville Regional Office,Public Water Supply
Maureen McKinney,Wastewater Operator Certification Group
Susan Meadows,Water Sciences Section
2

DRAFT Permit NC0004774
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
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 shall become effective Estimated: September 1, 2018.
This permit and authorization to discharge shall expire at midnight on Estimated:August 31, 2023.
Signed this day Estimated:August 2018.
DRAFT
Linda Culpepper, Interim Director
Division of Water Resources
By Authority of the Environmental Management Commission

DRAFT Permit 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:
• Convey wastewaters generated at the facility to the Buck ash basin system,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;and
• Discharge treated wastewater from the ash basin system through Outfall 002,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)or at a new Outfall 006(proposed)to the
Yadkin River at the locations shown on the attached map;and
3. Upon diversion of the CTCC discharge to Outfalls 001A or 006,discharge treated ash basin decanting
and dewatering wastes at Outfall 002 or at a new Outfall 007(proposed)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
5. 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.
ii

DRAFT Permit NC0004774
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Duke Energy— Buck Steam Station
X
/'tJ County: Rowan
SCALE o Receiving Stream: Yadkin River(High Rock Lake)
Stream Classification: 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
iii

DRAFT Permit NC0004774
Contents
PERMIT
SUPPLEMENT TO PERMIT COVER SHEET ii
FACILITY MAP
PART I-MONITORING,CONTROLS,AND LIMITATIONS FOR PERMITI ED DISCHARGES 1
SECTION A-STEAM ELECTRIC AND COAL ASH BENEFICIATION OPERATIONS 1
A.(1.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS(Outfall 002-BSS+CTCC Operations) 1
A.(2.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS(Outfall 002-CTCC Operations) 3
A.(3.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS(Outfall 001A-CTCC Operations) 5
A.(4.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS(Outfall 006-CTCC Operations) 7
A.(5.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS(Outfall 002A) 9
A.(6.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS(Outfall 004) 9
A.(7.)MONITORING REQUIREMENTS(Internal Outfall 008-Coal Ash Beneficiation Plant) 10
SECTION B-ASH BASIN REMEDIATION and TOE DRAIN DISCHARGES 11
B.(1.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS(Outfall 002-Ash Pond Decanting) 11
B.(2.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS(Outfall 002-Ash Pond Dewatering) 13
B.(3.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS(Outfall 007-Ash Pond Decanting) 15
B.(4.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS(Outfall 007-Ash Pond Dewatering) 17
B.(5.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS(Outfall 111-Constructed Seep) 19
B.(6.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS(Outfall 117-Constructed Seep) 20
SECTION C-ADDITIONAL SPECIAL CONDITIONS 21
C.(1.)DEFINITIONS 21
C.(2.)NOTIFICATIONS AND SUBMITTALS 21
C.(3.)CHEMICAL DISCHARGES 21
C.(4.)DISCHARGES OF OTHER MATERIALS 22
C.(5.)BIOCIDE CONDITION 22
C.(6.)METALS ANALYSES 22
C.(7.)PRIORITY POLLUTANT LIMITATIONS AND ANALYSES 22
C.(8.)CHRONIC TOXICITY PERMIT LIMIT(Monthly/Quarterly) 22
C.(9.)WASTE TREATMENT MODIFICATIONS 23
C.(10.)FLOW MONITORING AND REPORTING 24
C.(11.)INSTREAM MONITORING 24
C.(12.)FISH TISSUE MONITORING NEAR ASH POND DISCHARGE(Outfalls 002/007) 24
C.(13.)CLEAN WATER ACT SECTION 316(a)THERMAL VARIANCE 24
C.(14.)CLEAN WATER ACT SECTION 316(b)INTAKE STRUCTURE REQUIREMENTS 25
C.(15.)ASH POND OPERATIONS AND MAINTENANCE 25
C.(16.)APPLICABLE STATE LAW(State-Enforceable Only) 25
C.(17.)GROUNDWATER COMPLIANCE BOUNDARY 26
C.(18.)NO WAIVER OF RIGHTS 26
C.(19.)ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS 26
ATTACHMENT 1- GROUNDWATER COMPLIANCE BOUNDARY MAP 29
PART II-STANDARD CONDITIONS FOR NPDES PERMITS
PART III-OTHER REQUIREMENTS
PART IV-SPECIAL CONDITIONS FOR MUNICIPAL FACILITIES(Not Applicable)
iv

DRAFT Permit NC0004774
PART I -MONITORING,CONTROLS, AND LIMITATIONS FOR PERMITTED DISCHARGES
SECTION A- STEAM ELECTRIC AND COAL ASH BENEFICIATION OPERATIONS
A.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 002-BSS +
CTCC Operations)
[15A NCAC 02B .0400 et seq.,02B .0500 et seq.]
a. During the period beginning on the effective date of the permit and lasting until elimination of all
remaining Buck Steam Station(BSS)waste flows or until permit expiration,whichever is first,the
Permittee is authorized to discharge treated wastes,as described herein,from the ash settling pond
through Outfall 002.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 Weekly Pump Logs or Effluent
similar readings
pH >_ 6.0 and <_ 9.0 standard units Weekly Grab Effluent
Total Nitrogen, mg/L 2 Monthly Grab Effluent
Total Phosphorus, mg/L Monthly Grab Effluent
Total Suspended Solids 23.0 mg/L _ 74.0 mg/L Quarterly Grab Effluent
Oil and Grease 11.0 mg/L 15.0 mg/L Quarterly Grab Effluent
Total Hardness, mg/L as CaCO3 Quarterly Grab Effluent
Total Arsenic 3 10.0 pg/L 340 ug/L Quarterly Grab Effluent
(effective[>6 mos.])
Total Selenium, pg/L 3 Quarterly Grab Effluent
Total Mercury, ng/L 3 Quarterly Grab Effluent
Total Antimony 3 5.6 pg/L 5.6 pg/L Quarterly Grab Effluent
(effective[>6 mos.])
Total Chromium 3.4 200 pg/L 200 pg/L Quarterly Grab Effluent
Trivalent Chromium 3 118 pg/L 905 pg/L Quarterly Calculated Effluent
(effective[>6 mos.])
Hexavalent Chromium 3 11.0 pg/L 16.0 pg/L Quarterly Grab Effluent
(effective[>6 mos.])
Total Copper 3 7.9 pg/L 10.5 pg/L Quarterly Grab Effluent
(effective[>6 mos.])
Total Nickel 3 25.0 pg/L 335 pg/L Quarterly Grab Effluent
(effective[>6 mos.])
Total Zinc 3'4 126 pg/L 126 pg/L Quarterly Grab Effluent
(effective[>6 mos.])
Chronic Toxicity s P/F @ 0.7% (eff[1st 6 mos.]) Quarterly Grab Effluent
P/F @ 90% (effective[>6 mos.])
The 126 priority pollutants
except Total Chromium and No detectable amount Annually Grab Effluent
Total Zinc 3,4
Footnotes: Red text reflects compliance schedule.Final permit will specify actual expiration and effective dates.
1. Effluent sampling shall be conducted at the discharge from the ash settling pond prior to mixing with any other
waste streams.
2. Total Nitrogen=NO2-N+NO3-N+TKN
3. See Special Condition C.(6.)Metals Analysis.
4. See Special Condition C.(7.)Priority Pollutant Limitations and Analysis.
5. See Special Condition C.(8.)Chronic Toxicity Permit Limit.
1

DRAFT Permit NC0004774
A.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (cont.)
b. The following are authorized waste flows and shall pass through the ash settling pond prior to
discharge:
i. CTCC Plant Wastewater Sump: potable, service,and process water treatment wastes;floor drain
wastes;cooling tower blowdown;and heat recovery steam generator(HRSG)and auxiliary
boiler blowdowns;and
ii. BSS Yard Sump: sanitary (water treatment)wastes and groundwater seepage into powerhouse
structure.
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 notify the Division in writing no later than seven calendar days prior to
elimination of all remaining BSS waste flows and closure of the BSS Yard Sump;see Special Condition
C.(2.) Notifications and Submittals.
f. The Permittee shall notify the Division in writing no later than seven calendar days prior to diversion
of the waste flows to Outfall 001A or 006;see Special Condition C.(2.) Notifications and Submittals.
2

DRAFT Permit NC0004774
A.(2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 002- CTCC
Operations)
[15A NCAC 02B .0400 et seq.,02B .0500 et seq.]
a. During the period beginning upon elimination of all remaining waste flows from the Buck Steam
Station and lasting until diversion of all CTCC Plant waste flows to Outfall 001A or 006 or until permit
expiration,whichever is first,the Permittee is authorized to discharge treated wastewaters,as
described herein,from Outfall 002.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 Weekly Pump Logs or Effluent
similar readings
pH >_ 6.0 and <_ 9.0 standard units Weekly Grab Effluent
Total Nitrogen, mg/L 2 Monthly Grab Effluent
Total Phosphorus, mg/L Monthly Grab Effluent
Total Suspended Solids 23.0 mg/L 74.0 mg/L Monthly Grab Effluent
Oil and Grease 11.0 mg/L 15.0 mg/L Monthly Grab Effluent
Total Hardness, mg/L as CaCO3 Monthly Grab Effluent
Total Arsenic, pg/L 3 Monthly Grab Effluent
Total Selenium, pg/L 3 Monthly Grab Effluent
Total Mercury 3.4 12.0 ng/L(annual average) Monthly Grab Effluent
(effective[>6 mos.])
Total Aluminum 3 6.5 mg/L 6.5 mg/L Monthly Grab Effluent
(effective[>6 mos.])
Total Antimony 3 5.6 pg/L 5.6 pg/L Monthly Grab Effluent
(effective[>6 mos.])
Total Chromium 3.5 200 lig/L 200 pg/L Monthly Grab Effluent
pg/L 905 Trivalent Chromium 118(effective[>6 mos.])9/L Monthly Calculated Effluent
Hexavalent Chromium 3 11.0 pg/L 16.0 pg/L Monthly Grab Effluent
(effective[>6 mos.])
Total Copper 3 7.9 pg/L 10.5 pg/L Monthly Grab Effluent
(effective[>6 mos.])
Total Nickel 3 25.0 pg/L 335 pg/L Monthly Grab Effluent
(effective[>6 mos.])
Total Zinc 3.5 126 pg/L 126 pg/L Monthly Grab Effluent
(effective[>6 mos.])
Total Fluoride 1.8 mg/L 1.8 mg/L Monthly Grab Effluent
(effective[>6 mos.])
Chloroform, pg/L 6 Quarterly Grab Effluent
Chronic Toxicity' P/F @ 0.7%° (eff[1st 6 mos.]) Quarterly Grab Effluent
P/F @ 90% (effective[>6 mos.])
The 126 priority pollutants
except Total Chromium and No detectable amount Annually Grab Effluent
Total Zinc 3,5
Footnotes: Final permit will specify the e.rpiration and effertioe dam's for these limits.
1. Effluent sampling shall be conducted at the discharge from the ash settling pond prior to mixing with any other
waste streams.
2. Total Nitrogen=NO2-N+NO3-N+TKN
3. See Special Condition C.(6.)Metals Analyses.
4. Total Mercury: Annual average shall be calculated on calendar year basis.
3

DRAFT Permit NC0004774
A.(2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (cont.)
Footnotes(cont.):
5. See Special Condition C.(7.)Priority Pollutant Limitations and Analysis.
6. See paragraph(f)of this condition.
7. See Special Condition C.(8.)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;and heat recovery steam generator (HRSG) and
auxiliary boiler blowdowns.All such waste flows shall 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. No later than 180 days after this special condition becomes effective,the Permittee shall analyze at
least one representative sample of the CTCC Plant Wastewater Sump discharge and submit a
complete and accurate EPA Application Form 2C for the discharge. If the discharge becomes subject to
Special Conditions A.(3.)or A.(4.)before this requirement is satisfied,the requirement and the original
180-day compliance date remain in effect;see conditions A.(3.) (f)and A.(4.) (f).
f. The initial chloroform analysis shall be conducted no later than 180 days after this condition becomes
effective. If the initial analysis does not yield a reportable concentration of chloroform (PQL <2.0
lig/L),the chloroform monitoring specified in paragraph(a) is waived for the remainder of the permit
term.
g. The Permittee shall notify the Division in writing no later than seven calendar days prior to diversion
of CTCC Plant flows to Outfall 001A or 006;see Special Condition C.(2.) Notifications and Submittals.
4

DRAFT Permit NC0004774
A.(3.) 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 diversion of CTCC Plant
flows to Outfall 006 or until permit expiration,whichever is first,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 Grab Effluent
Temperature 35°C(95°F) Daily Grab Effluent
Temperature 2 Daily Grab Intake and
Effluent
Total Nitrogen, mg/L 3 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 pg/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 pg/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 lig/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. The daily average temperature of the effluent shall be such as not to exceed 10°C(50°F)if the daily average intake
temperature is below 2.5°C(36.5°F),and shall not exceed two times the intake temperature(°F)minus 23 if the daily
average intake temperature ranges from 2.5°C(36.5°F)to 12.8°C(55°F)when only units with the same control
system are operating.See also paragraphs(h)and(i)of this condition.
3. Total Nitrogen=NO2-N+NO3-N+TKN
(Footnotes continued next page.)
5

DRAFT Permit NC0004774
A.(3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (cont.)
Footnotes(cont):
4. The Division shall consider all effluent TRC values reported below 50µg/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 50µg/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 C.(6.)Metals Analyses.
6. See Special Condition C.(7.)Priority Pollutant Limitations and Analysis.
7. See paragraph(g)of this condition.
8. See Special Condition C.(8.)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;and heat recovery steam generator(HRSG)and
auxiliary boiler blowdowns.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. This condition is not intended to authorize concurrent waste discharges through both Outfalls 001A
and 006 except to the extent necessary to make an orderly transition to the newer outfall.The
Permittee shall cease discharge at Outfall OO1A as soon as practical after bringing Outfall 006 online.
f. Unless it has already done so in accordance with Special Condition A.(2.) (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 the date
established per Condition A.(2.) (e).
g. If chloroform monitoring was waived in accordance with conditions A.(2.) (a) and (f),the monitoring
requirement specified in paragraph(a)of this condition is waived for the remainder of the permit
term. 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.
h. 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.
i. 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).
j. The Permittee shall notify the Division in writing no later than seven calendar days prior to diversion
of CTCC Plant flows to Outfall 006;see Special Condition C.(2.) Notifications and Submittals.
6

DRAFT
Permit NC0004774
A.(4.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 006-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 006 and lasting until permit expiration,the
Permittee is authorized to discharge wastewaters,as described herein,from Outfall 006.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 Grab Effluent
Temperature 35°C(95°F) Daily Grab Effluent
Temperature 2 Daily Grab Intake and
Effluent
Total Nitrogen, mg/L 3 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 pg/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 pg/L 200 pg/L 2/Month Grab Effluent
Total Copper, pg/L 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. The daily average temperature of the effluent shall be such as not to exceed 10°C(50°F)if the daily average intake
temperature is below 2.5°C(36.5°F),and shall not exceed two times the intake temperature(°F)minus 23 if the daily
average intake temperature ranges from 2.5°C(36.5°F)to 12.8°C(55°F)when only units with the same control
system are operating.See also paragraphs(h)and(i)of this condition.
3. Total Nitrogen=NO2-N+NO3-N+TKN
(Footnotes continued next page.).
7

DRAFT Permit NC0004774
A.(4.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (cont.)
Footnotes(cont.):
4. The Division shall consider all effluent TRC values reported below 50µg/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 50µg/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 C.(6.)Metals Analyses.
6. See Special Condition C.(7.)Priority Pollutant Limitations and Analysis.
7. See paragraph(g)of this condition.
8. See Special Condition C.(8.)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;and heat recovery steam generator(HRSG)and
auxiliary boiler blowdowns.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. Conditions A.(3.)and A.(4.)are not intended to authorize concurrent waste discharges through both
Outfalls OO1A and 006 except as necessary to make an orderly transition to the new outfall.The
Permittee shall cease discharge at Outfall 001A as soon as practical after bringing Outfall 006 online.
f. Unless it has already done so in accordance with Special Condition A.(2.) (e)or A.(3.) (f),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 the date
established in condition A.(2.)(e).
g. If chloroform monitoring was waived in accordance with conditions A.(2.)a)and (f)or conditions
A.(4.)(a)and(g),the monitoring requirement specified in paragraph(a)of this condition is waived for
the remainder of the permit term.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
pg/L),chloroform monitoring specified in paragraph(a)is waived for the remainder of the permit
term.
h. 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.
i. 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).
j. The Permittee shall notify the Division in writing no later than seven calendar days following the
closure of Outfall 001A to confirm its closure;see Special Condition C.(2.)Notifications and
Submittals.
8

DRAFT Permit NC0004774
A.(5.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 002A)
[15A NCAC 02B .0400 et seq.,02B .0500 et seq.]
a. During the period beginning on the effective date of the permit and lasting until elimination of all
remaining waste flows from the Buck Steam Station or until permit expiration,whichever is first,the
Permittee is authorized to discharge emergency yard sump overflows from Outfall 002A.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 Episodic Estimate Effluent
pH >_ 6.0 and <_ 9.0 standard units Episodic Grab Effluent
Total Suspended Solids, mg/L 23.0 mg/L 74.0 mg/L Episodic Grab Effluent
Oil and Grease 11.0 mg/L 15.0 mg/L Episodic Grab Effluent
Fecal Coliform, #/100 mL Episodic Grab Effluent
Footnotes:
1. Episodic sampling is required a minimum of once per day when sump overflows occur.All samples shall be
representative of the discharge.
2. Effluent sampling shall be conducted at a point prior to discharge to the Yadkin River.
3. See Special Condition C.(10.) Flow Monitoring and Reporting regarding reporting flow when no discharge occurs.
b. Authorized waste discharges from the BSS Yard Sump are sanitary(water treatment)wastes,
incidental flows from floor drains and groundwater seepage into the powerhouse structure,all of
which are generated at the BSS powerhouse;and stormwater from the existing sump drainage area.
c. There shall be no discharge of floating solids or visible foam in other than trace amounts.
d. The Permittee shall notify the Division when all waste flows to the sump are eliminated,per
Condition A.(1.) (e).
A.(6.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 004)
[15A NCAC 02B .0400 et seq.,02B .0500 et seq.,15A NCAC 02H .0106(0(2)]
a. The release of screenings from the Buck raw water intake is deemed permitted so long as the release
does not contravene water quality standards.
b. The Permittee shall monitor the water quality impact of such releases at least once per quarter. If the
release is found to contravene water quality standards,the Permittee shall note same on the
appropriate DMR form.
9

DRAFT Permit NC0004774
A.(7.) 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
Pump logs,
Flow, MGD 2 Daily similar readings,or Effluent
(first year) 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 Grab 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 C.(10.)Flow Monitoring and Reporting.
3. See Special Condition C.(6.)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 C.(2.)Notifications and Submittals.
10

DRAFT Permit NC0004774
SECTION B- ASH BASIN REMEDIATION AND CONSTRUCTED SEEP DISCHARGES
B.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 002- Ash Pond
Decanting)
[15A NCAC 02B .0400 et seq.,02B .0500 et seq.]
a. During the period beginning with the elimination of all BSS waste flows and diversion of CTCC Plant
flows to Outfall 001A or 006 and lasting until commencement of ash basin dewatering,diversion of
decant discharges to Outfall 007,or permit expiration,whichever is first,the Permittee is authorized to
discharge decant water from Outfall 002(decanting the free water above the settled ash layer that does
not involve mechanical disturbance of the ash).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 Weekly Pump Logs or Effluent
similar readings
_pH 2 >_ 6.0 and <_ 9.0 standard units _ Weekly Grab Effluent
Total Nitrogen, mg/L 3 Monthly Grab Effluent
Total Phosphorus, mg/L Monthly _ Grab Effluent
Total Suspended Solids 4 23.0 mg/L 74.0 mg/L Monthly Grab Effluent
Oil and Grease 11.0 mg/L 15.0 mg/L Monthly Grab Effluent _
Total Dissolved Solids 500 mg/L 500 mg/L Monthly Grab Effluent
Turbidity, NTU 5 Monthly Grab Effluent
Chlorides 250 mg/L 250 mg/L Monthly Grab i Effluent
Total Hardness, mg/L as CaCO3 Monthly Grab Effluent
Total Arsenic 6 10.0 pg/L 340 pg/L Monthly Grab Effluent _
Total Selenium 6 5.0 pg/L 56.0 pg/L Monthly Grab Effluent
Total Mercury, ng/L 6 Monthly Grab Effluent
Total Antimony 6 5.6 pg/L 5.6 pg/L Monthly Grab Effluent
Total Copper 6 7.9 pg/L 10.5 pg/L Monthly Grab Effluent
Total Chromium, ug/L 6 Monthly Grab Effluent
Hexavalent Chromium, ug/L 6 Monthly Grab Effluent
Trivalent Chromium, ug/L 6 Monthly Grab Effluent
Total Lead 6 2.9 pg/L 75.0 pg/L Monthly Grab Effluent
Total Nickel 6 25.0 pg/L 335 pg/L Monthly Grab Effluent
Total Thallium, pg/L 6 _ Monthly Grab Effluent
Chronic Toxicity ' P/F at 90% Quarterly 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 decanting process commences(and one or more pumps are
operating),and the decanting 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
(Footnotes continued next page.)
11

DRAFT Permit NC0004774
B.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (cont.)
Footnotes(cont.):
4. The Permittee shall continuously monitor TSS concentration when the decanting process commences(and one or
more pumps is operating),and the decanting 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 50 NTU. If the instream
turbidity exceeds 50 NTU due to natural background conditions,the discharge shall not cause turbidity to increase
in the receiving stream. Therefore,if the effluent turbidity exceeds 50 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)).
6. See Special Condition C.(6.)Metals Analyses.
7. See Special Condition C.(7.)Chronic Toxicity Permit Limit.
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
c. The Permittee shall notify the Division of Water Resources,in writing,no later than seven calendar
days prior to commencement of decanting;see Special Condition C.(2.)Notifications and Submittals.
d. When the Permittee commences ash pond decanting/dewatering,it shall treat the wastewater
discharged from the ash pond(s)using physical-chemical treatment,if necessary,to ensure state Water
Quality Standards are not contravened in the receiving stream.The Permittee shall notify the Division
of Water Resources,in writing,within seven calendar days of installing additional physical-chemical
treatment at this outfall;see Special Condition C.(2.)Notifications and Submittals.
e. The facility is allowed to draw down the wastewater in the ash pond to no less than three feet above
the ash.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.
f. The limits and conditions for the discharge of dewatering waters shall apply when water in the ash
settling basin is lowered below the three feet trigger mark.
g. The Permittee shall notify the Division of Water Resources in writing no later than seven calendar
days prior to diversion of ash pond discharges to Outfall 007;see Special Condition C.(2.)
Notifications and Submittals.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.
h. The Permittee shall notify the Division of Water Resources in writing no later than seven calendar
days prior to commencement of ash dewatering;see Special Condition C.(2.)Notifications and
Submittals.
12

DRAFT Permit NC0004774
B.(2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 002- 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 lasting until diversion of
dewatering discharges to Outfall 007 or permit expiration,whichever is first,the Permittee is
authorized to discharge treated ash dewatering waste flows from Outfall 002.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 or Effluent
similar readings
pH 2 >_ 6.0 and 5 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 500 mg/L 500 mg/L Weekly Grab Effluent
Turbidity, NTU 5 Weekly Grab Effluent
Chlorides 250 mg/L 250 mg/L Weekly Grab Effluent
Total Hardness, mg/L as CaCO3 Weekly Grab Effluent
Total Arsenic 6 10.0 pg/L 340 pg/L Weekly Grab Effluent
Total Selenium 6 5.0 pg/L 56 pg/L Weekly Grab Effluent
Total Mercury, ng/L 6 Weekly Weekly Effluent
Total Antimony 6 5.6 pg/L 5.6 pg/L Weekly Grab Effluent
Total Copper 6 7.9 pg/L 10.5 pg/L Weekly Grab Effluent
Total Chromium,ug/L 6 Weekly Grab Effluent
Hexavalent Chromium, ug/L 6 Weekly Grab Effluent
Trivalent Chromium, ug/L 6 Weekly Grab Effluent
Total Lead 6 2.9 pg/L 75 pg/L Weekly Grab Effluent
Total Nickel 6 25 pg/L 335 pg/L Weekly Grab Effluent
Total Thallium 6 2.0 pg/L 2.0 pg/L Weekly Grab Effluent
Chronic Toxicity' P/F @ 90% 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.
(Footnotes continued next page.)
13

D RAFT Permit NC0004774
B.(2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (cont.)
Footnotes(cont.):
5. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50 NTU. If the instream
turbidity exceeds 50 NTU due to natural background conditions,the discharge shall not cause turbidity to increase
in the receiving stream. Therefore,if the effluent turbidity exceeds 50 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)).
6. See Special Condition C.(6.)Metals Analyses.
7. See Special Condition C.(7.)Chronic Toxicity Permit Limit.
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
c. When the Permittee commences ash pond decanting/dewatering,it shall treat the wastewater
discharged from the ash pond(s)using physical-chemical treatment,if necessary,to ensure state Water
Quality Standards are not contravened in the receiving stream.The Permittee shall notify the Division
of Water Resources,in writing,within seven calendar days of installing additional physical-chemical
treatment at this outfall;see Special Condition C.(2.)Notifications and Submittals.
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. The Permittee shall notify the Division of Water Resources in writing no later than seven calendar
days prior to diversion of dewatering discharges to Outfall 007;see Special Condition C.(2.)
Notifications and Submittals.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.
14

DRAFT
Permit NC0004774
B.(3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 007-Ash Pond
Decanting)
[15A NCAC 02B .0400 et seq.,02B .0500 et seq.]
a. During the period beginning with the elimination of all BSS waste flows, diversion of CTCC Plant
flows to Outfall 001A or 006,and diversion of ash pond discharges to Outfall 007 and lasting until
commencement of ash basin dewatering or permit expiration,whichever is first,the Permittee is
authorized to discharge decant water from Outfall 007(decanting the free water above the settled ash
layer that does not involve mechanical disturbance of the ash). Such discharges shall be limited and
monitored by the Permittee as specified below:
EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
PARAMETER Monthly Daily Measurement Sample Sample 1
Average Maximum Frequency Type Location 1
Flow, MGD Weekly Pump Logs or Effluent I
similar readings
pH 2 >_ 6.0 and <_ 9.0 standard units Weekly Grab Effluent
Total Nitrogen, mg/L 4 Monthly Grab Effluent
Total Phosphorus, mg/L Monthly Grab Effluent
Total Suspended Solids 4 23.0 mg/L 74.0 mg/L Monthly Grab _ Effluent
Oil and Grease 11.0 mg/L 15.0 mg/L Monthly Grab Effluent
Total Dissolved Solids, mg/L Monthly _ Grab Effluent
Turbidity,NTU 5 Monthly Grab Effluent
Chlorides, mg/L Monthly Grab Effluent
Total Hardness,mg/L as CaCO3 Monthly Grab Effluent
Total Arsenic, ug/L 6 Monthly Grab Effluent
Total Selenium, ug/L 6 Monthly Grab Effluent
Total Mercury,ng/L 6 Monthly Grab Effluent
Total Antimony, pg/L 6 Monthly Grab Effluent
Total Copper, ug/L 6 Monthly Grab Effluent
Total Chromium, ug/L 6 _ Monthly _ Grab Effluent
Total Lead, pg/L 6 ______ Monthly _ Grab Effluent
Total Nickel, pg/L 6 Monthly Grab Effluent
Total Thallium, pg/L 6 Monthly Grab Effluent
Chronic Toxicity ' P/F @ 0.3% Quarterly 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 decanting process commences (and one or more pumps is
operating),and the decanting 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 decanting process commences(and one or
more pumps is operating),and the decanting 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.
(Footnotes continued next page.)
15

DRAFT
Permit NC0004774
B.(3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (cont.)
Footnotes(cont.):
5. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50 NTU. If the instream
turbidity exceeds 50 NTU due to natural background conditions,the discharge shall not cause turbidity to increase
in the receiving stream. Therefore,if the effluent turbidity exceeds 50 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)).
6. See Special Condition C.(6.)Metals Analyses.
7. See Special Condition C.(7.)Chronic Toxicity Permit Limit.
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
c. When the Permittee commences ash pond decanting/dewatering,it shall treat the wastewater
discharged from the ash pond(s)using physical-chemical treatment,if necessary,to ensure state Water
Quality Standards are not contravened in the receiving stream.The Permittee shall notify the Division
of Water Resources,in writing,within seven calendar days of installing additional physical-chemical
treatment at this outfall;see Special Condition C.(2.)Notifications and Submittals.
d. The facility is allowed to draw down the wastewater in the ash pond to no less than three feet above
the ash.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. The limits and conditions for the discharge from dewatering operations shall apply when water in the
ash settling basin is lowered below the three feet trigger mark.
f. The Permittee shall notify the Division of Water Resources in writing no later than seven calendar
days prior to commencement of ash basin dewatering;see Special Condition C.(2.)Notifications and
Submittals.
g. 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.
16

DRAFT Permit NC0004774
B.(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 REQUIREMENTS1
PARAMETER Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location
Flow, 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 @ 0.1% 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 50 NTU. If the instream
turbidity exceeds 50 NTU due to natural background conditions,the discharge shall not cause turbidity to increase
in the receiving stream. Therefore,if the effluent turbidity exceeds 50 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)).
6. See Special Condition C.(6.)Metals Analyses.
7. See Special Condition C.(7.)Chronic Toxicity Permit Limit.
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DRAFT Permit NC0004774
B.(4.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (cont.)
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
c. When the Permittee commences ash pond decanting/dewatering,it shall treat the wastewater
discharged from the ash pond(s)using physical-chemical treatment,if necessary, to ensure state Water
Quality Standards are not contravened in the receiving stream.The Permittee shall notify the Division
of Water Resources,in writing,within seven calendar days of installing additional physical-chemical
treatment at this outfall;see Special Condition C.(2.) Notifications and Submittals.
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.
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DRAFT Permit NC0004774
B.(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 Outfall 111 (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
How,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/L4 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 C.(10.)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 C.(6.)Metals Analyses.
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
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DRAFT Permit NC0004774
B.(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 Outfall 117(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' 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 Aluminum4 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 C.(10.)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 C.(6.)Metals Analyses.
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
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DRAFT Permit NC0004774
SECTION C- ADDITIONAL SPECIAL CONDITIONS
C.(1.) 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)).
C.(2.) 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 Mooresville Regional Office
Attn: Duke Energy Permits Specialist 610 East Center Avenue,Suite 301
1617 Mail Service Center Mooresville,NC 28115
Raleigh,NC 27699-1617
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
Electronic copies shall be PDF files recorded on compact discs(CDs),or as approved by the Division.
C.(3.) 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.
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,
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DRAFT Permit NC0004774
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.
C.(4.) 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.
C.(5.) 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.
C.(6.) 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.
C.(7.) 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.
C.(8.) 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 90%,0.7%,0.3%,or 0.1%,as specified for the discharge
in Sections A and B of this permit.
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DRAFT Permit NC0004774
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
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.
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.
C.(9.) 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
23

DRAFT Permit NC0004774
proposed waste holding basin.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 C.(2.)Notifications and Submittals.
C.(10.) 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)).
C.(11.) INSTREAM MONITORING
[G.S.143-215.66]
a. The Permittee shall conduct monthly instream monitoring(approximately 4,000 ft.upstream and
10,000 ft. downstream of Outfall 002)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.
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 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.Instream monitoring shall be conducted as stated
in this permit should the permittee end its participation in the Association.
C.(12.) 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 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.
C.(13.) 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.Should the
permittee wish 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)not later than 180 days prior to permit expiration. Reapplication shall
include a basis for continuation such as a)plant operating conditions and load factors are unchanged
and are expected to remain so for the term of the reissued permit;b)there are no changes to plant
discharges or other discharges in the plant site area which could interact with the thermal discharges;
and c)there are no changes to the biotic community of the receiving water body which would impact
the previous variance determination.
b. The 316(a)studies required with the reapplication,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.
24

DRAFT Permit NC0004774
c. 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 C.(2.) Notifications and
Submittals.
C.(14.) CLEAN WATER ACT SECTION 316(b) INTAKE STRUCTURE REQUIREMENTS
[40 CFR 125.95]
a. The Permittee shall comply with the Cooling Water Intake Structure Rule per 40 CFR 125.95.The
Permittee shall submit all the materials required by the Rule with the next application for renewal of
this permit.
b. The Permittee shall submit copies of all study plans,study results,and any other applicable materials
to the Division as specified in Special Condition C.(2.) Notifications and Submittals.
C.(15.) 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 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.
C.(16.) 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.
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DRAFT Permit NC0004774
C.(17.) 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.
C.(18.) 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.
C.(19.) 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)1
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
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.
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DRAFT Permit NC0004774
C.(19.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS (cont.)
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 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)j
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.
27

DRAFT Permit NC0004774
C.(19.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS (cont.)
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].
28

DRAFT Permit NC0004774
ATTACHMENT 1 -
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