NC0024392_Draft Permit_20230530

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ROY COOPER ,,
Governor L=
1 ELIZABETH S.BISER * 4.41111.f* , ,.<
Secretary t g ,fl 4 '
RICHARD E.ROGERS,JR. NORTH CAROLINA
Director Environmental Quality
May 30, 2023
Mr.Thomas D. Ray,Site Vice President
McGuire Nuclear Power Plant
12700 Hagers Ferry Road,Mail code: MG01 EM
Huntersville,NC 28078
Subject: Draft NPDES Permit
Permit NC0024392
McGuire Nuclear Power Plant
Mecklenburg County
Facility Class II
Dear Mr. Ray:
Enclosed with this letter is a copy of the Draft Permit for your facility. Please review the
draft very carefully to ensure thorough understanding of the conditions and requirements it
contains.
The Draft Permit contains the following significant changes from your current permit:
1. The Division approved 316(b) report submitted by Duke and updated Section A. (21.)
accordingly.
2._ The Section A. (16) entitled Lakg Monitoing Aquatic Environmental Maintenance
Monitoring Program has been removed to eliminate redundancy with 316(a) requirements.
3. Total Thallium limits were eliminated based on the results of the Reasonable Potential
Analysis (Outfall 001).
Please provide any comments you have regarding the draft permit to this office by July 3,
2023. At this time,the Division is also publishing a notice in the newspapers of general circulation
in Mecklenburg County,inviting public comment on the draft permit. 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
North Carolina Deprtment of imtal Qes
�� 512 North Salisburya Street 11611Env Mailron ens ervice CenterualityI IDivision Raleighof,NorthWater Carolina Resourc27699-1611
D
TH CAFOOI.WA ' 919.707.9000
e.rr..r a u m.nwa .a a„ V .'/

If you have any questions about the NPDES permit process,please contact me at the following e-
mail address: [e-mail],or telephone number: 919-707-3606.
Sincerely,
Sergei Chernikov,Ph.D.
Environmental Engineer III
Industrial NPDES Permitting Unit
cc: NPDES Files
Mooresville Regional Office/Surface Water Protection(e-copy)
Mooresville Regional Office/Water Supply(e-copy)
EPA Region IV(e-copy)
Aquatic Toxicology Unit(e-copy)
TACU (e-copy)
-y� North Carolina Department of Environmental Quality I Division of Water Resources
DE Q J� Nor North Salisbury Street 11611 Mail Service Center I Raleigh,North Carolina 27699-1611
"���� 919.707.9000
I

Permit NC0024392
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 provision 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 and stormwater from a facility located at the
McGuire Nuclear Station
12700 Hagers Ferry Rd
Huntersville
Mecklenburg County
to receiving waters designated as the Catawba River (Lake Norman& Mountain Island Lake)
in the Catawba River Basin in accordance with effluent limitations, monitoring requirements,
and other conditions set forth in Parts I, II, III, and IV hereof.
The permit shall become effective
This permit and the authorization to discharge shall expire at midnight on
Signed this day
Richard E. Rogers,Jr., Director
Division of Water Resources
By Authority of the Environmental Management Commission

Permit NC0024392
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 to operate wastewater treatment facilities necessary to comply with final effluent limitations
contained in this permit and located at McGuire Nuclear Station,northwest of Charlotte in Mecklenburg
County;
2. Outfall 001:Continue to discharge wastewaters from Internal Outfall 004,condenser cooling water,once
through cooling water, low pressure service water, ventilation unit drains, KC heat exchanger drain,
through Outfall 001 at the location specified on the attached map into Lake Norman which is classified
Class WS-IV,B;CA waters in the Catawba River Basin;the use,and subsequent discharge,of Auxiliary
Condensate System Water for backflushing of piping connections between the RN piping and the CA
system is authorized on an as-needed basis.
3. Outfall 002: Continue to discharge from miscellaneous system components cleaning, turbine building
sumps,water treatment room sumps,condensate demineralizer backwashes,closed cooling systems,the
Standby Shutdown Facility sumps,laboratory drains,landfill leachate,steam generator blowdown,wet
lay-up,dewatering pumps,chemical cleaning wastewater and other low volume wastewater generating
activities after treatment in the conventional wastewater treatment system consisting of a 200,000 gallon
concrete lined initial holdup pond lined with a sprayed in polyurethane liner,two paralle12.5 MG settling
ponds(both with HDPE liner) , a concrete lined 1 MG final holdup pond lined with a sprayed in
polyurethane liner, chemical addition of coagulants, oxidants, catalysts, pH control, and effluent pH
adjustment by CO2 addition with discharge through Outfall 002 at the location specified on the attached
map into the Catawba River(Mountain Island Lake)which is classified WS-IV;CA waters in the Catawba
River Basin;
4. Internal Outfall 004: Continue to discharge from the radwaste liquid monitoring system, floor and
equipment drains,laundry drains,ventilation unit drains and other low volume wastewater generating
activities through Internal Outfall 004,discharging through Outfall 001 at the location specified on the
attached map into Lake Norman which is classified WS-IV,B;CA waters in the Catawba River Basin;
5. Outfall 005: Continue to discharge standby nuclear service pond overflow, administrative building
drains(HVAC sump,floor drains,janitorial sinks,hot water boiler,chiller water system),closed cooling
system water from auxiliary building(during maintenance),main condenser cooling dewatering,filtered
water,HVAC unit drains,yard drains,emergency discharge of the turbine building sumps and reverse
osmosis reject flows to the wastewater collection basin consisting of a 13.4 acre settling pond and surface
skimmer with discharge through Outfall 005 at the locations specified on the attached map into the
Catawba River(Mountain Island Lake)which is classified WS-IV;CA waters in the Catawba River Basin;
and
6. Internal Outfall 006: Continue to discharge chemical metal cleaning wastes from Internal Outfall 006
through outfall 002 at the location specified on the attached map into the Catawba River(Mountain Island
Lake) which is classified WS-IV CA waters in the Catawba River Basin and through outfall 004 at the
location specified on the attached map into Lake Norman which is classified WS-IV B;CA waters in the
Catawba River Basin.
Page 2 of 16

Permit NC0024392
PART I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 001)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of the permit and lasting until expiration,the
Permittee is authorized to discharge from Outfall 001. Such discharges shall be limited and
monitored'by the Permittee as specified below:
PARAMETER DISCHARGE MONITORING REQUIREMENTS
LIMITATIONS
Monthly Daily Measurement Sample Type Sample
Average Maximum Frequency Location
Intake Flow (MGD) Daily Pump Logs I
Temperature3 95°F Daily Recorder DCB
(October-June) (35°C)
Temperature3 99°F Daily Recorder DCB
(July-September) (37.2°C)
pH4 Quarterly Grab DCB
Acute Toxicity5 Quarterly Composite DCB
Free Available Chlorine6 0.20 mg/L 0.50 mg/L Weekly Multiple Grabs DS
Time of Chlorine Addition Footnote 8
NOTES:
1. Continue submitting discharge monitoring reports electronically using NC DWR's eDMR application
system. See Special Condition A. (22.).
2. I:Intake. DCB:Discharge canal bridge. DS:Discharge structure corresponding to an individual unit.
3. Temperature limits are based on Clean Water Act Section 316(a)thermal variance[see Special
Condition A. (6.)].A temperature mixing zone is defined in Special Condition A. (16.).
4. The pH shall not be less than 6.0 standard units or greater than 9.0 standard units.
5. Acute Toxicity(Ceriodaphnia 24 hour);No significant mortality at 90% with a composite sample of equal
volumes collected at one-hour intervals during a 24-hour period. Toxicity samples will be collected in
February,May,August,and November.See Special Condition A.(7.).
6. Monitoring for free available chlorine is required during and subsequent to chlorination. Monitoring
shall begin immediately upon start-up of chlorination and shall discontinue when free available
chlorine is no longer detected. Neither free available chlorine nor total residual chlorine may be
discharged from any single generating unit for more than two hours per day unless the discharger
demonstrates to the State that discharge for more than two hours is required for macroinvertebrate
control.
7. Multiple grab samples shall consist of grab samples collected at the approximate beginning of Free
Available Chlorine discharge and once every 15 minutes thereafter until FAC is no longer detected.
"Daily Maximum" FAC is the instantaneous maximum of any single grab.
8. The Permittee shall maintain a log of all chlorination events within each unit. The log shall be
maintained on file at the plant and shall be available for review or submitted to the Division upon
request by any of its representatives. For each chlorination event,the log shall list:(1)each system that
is chlorinated;(2)the volume of the system(gpm);(3)the chlorination begin and end time;and(4)the
total time of the chlorination event(minutes).
DISCHARGE OF ANY PRODUCT REGISTERED UNDER THE FEDERAL INSECTICIDE,FUNGICIDE,AND RODENTICIDE ACT IS
PROHIBITED UNLESS SPECIFICALLY AUTHORIZED ELSEWHERE IN THIS PERMIT.
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.
Page 3 of 16

Permit NC0024392
NOTE:TREATMENT OF THE NUCLEAR SERVICE WATER WITH HYDROGEN PEROXIDE TO ADDRESS FOULING OF THE REACTOR
COOLANT PUMP HEAT EXCHANGER IS PERMITTED.
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 002)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of the permit and lasting until expiration,the
Permittee is authorized to discharge from outfall 002(Conventional Wastewater Treatment
Facility). Such discharges shall be limited and monitored)by the Permittee as specified below:
PARAMETER DISCHARGE MONITORING REQUIREMENTS
LIMITATIONS
Monthly Daily Measurement Sample Type Sample
Average Maximum Frequency Location2
Flow(MGD) Daily Instantaneous E
Oil and Grease 15.0 mg/L 20.0 mg/L Quarterly Grab E
Total Suspended Solids 30.0 m g/L 100.0 mg/L Quarterly Grab E
Total Residual Chlorine Monthly Grab E
pH3 Monthly Grab E
Acute Toxicity4 Quarterly Grab E
NOTES:
1. Continue submitting discharge monitoring reports electronically using NC DWR's eDMR
application system. See Special Condition A.(22.).
2. E:Effluent,with sampling performed prior to mixing with any other waste streams.
3. The pH shall not be less than 6.0 standard units or greater than 9.0 standard units.
4. Acute Toxicity (Ceriodaphnia); LC50 at 80% with samples collected in February, May, August, and
November.See Special Condition A. (8.).
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.
•
Page 4 of 16

Permit NC0024392
A. (3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Internal
Outfall 004) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of the permit and lasting until expiration,the
Permittee is authorized to discharge from internal outfall 004 (Low Volume Wastes/Radwaste
Liquid Waste Monitoring System)l. Such discharges shall be limited and monitored2 by the
Permittee as specified below:
PARAMETER DISCHARGE MONITORING REQUIREMENTS
LIMITATIONS4
Monthly Daily Measurement Sample Type Sample
Average Maximum Frequency Location3
Flow(MGD) Weekly Instantaneous E
Total Suspended Solids 30.0 mg/L 100.0 mg/L Quarterly Grab E
Oil and Grease 15.0 mg/L 20.0 mg/L Quarterly Grab E
NOTES:
1. In the event the turbine building sumps are discharged through Outfall 004 or directly through
Outfall 001 instead of Outfall 002, the above discharge limitations shall also apply to the turbine
building sump discharge. Each discharge from the turbine building sumps shall be monitored as
specified above for flow,total suspended solids,oil and grease,if applicable.
2. Continue submitting discharge monitoring reports electronically using NC DWR's eDMR
application system. See Special Condition A. (22.).
3. Sample Locations: E-Waste Monitoring Tanks.
4. Limits for pH for this internal outfall have been applied at external outfall 001, based on EPA
guidance regarding pH limits for low volume wastes comingled with once through cooling waters.
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.
Page 5 of 16

Permit NC0024392
A. (4.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 005)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of the permit and lasting until expiration,the
Permittee is authorized to discharge from outfall 005 (Wastewater Collection Basin). Such
discharges shall be limited and monitored) by the Permittee as specified below:
PARAMETER DISCHARGE MONITORING REQUIREMENTS
LIMITATIONS
Monthly Daily Measurement Sample Type Sample
Average Maximum I Frequency Location
Flow(MGD) Weekly Instantaneous E
Total Suspended Solids 30.0 mg/L 100.0 mg/L Quarterly Grab E
Oil and Grease 15.0 mg/L 20.0 mg/L Quarterly Grab E
pH3 Quarterly Grab E
Chronic Toxicity' Quarterly Grab E
NOTES:
1. Continue submitting discharge monitoring reports electronically using NC DWR's eDMR
application system. See Special Condition A. (22.).
2. E:Effluent.
3. The pH shall not be less than 6.0 standard units or greater than 9.0 standard units.
4. Chronic Toxicity (Ceriodaphnia) at 2.9 % with samples collected in February, May, August, and
November.See Special condition A. (9.).
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.
•
Page 6 of 16

Permit NC0024392
A. (5.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Internal
Outfall 006) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
q q
During the period beginning on the effective date of the permit and lasting until expiration,the
Permittee is authorized to discharge from internal outfall 006(Chemical Metal Cleaning Wastes)1.
Such discharges shall be limited and monitored2 by the Permittee as specified below:
PARAMETER DISCHARGE LIMITATIONS MONITORING REQUIREMENTS
Monthly Daily Measurement Sample Type Sample
Average Maximum Frequency Location3
Flow(MGD) 1/Batch Instantaneous E
Total Suspended Solids 30.0 mg/L 100.0 mg/L 1/Batch Grab E
Oil and Grease 15.0 mg/L 20.0 mg/L 1/Batch Grab E
Total Recoverable Copper 1.0 mg/L 1.0 mg/L 1/Batch Grab E
Total Recoverable Iron 1.0 mg/L 1.0 mg/L 1/Batch Grab E
pH4 i 1/Batch Grab E
NOTES:
1. THESE LIMITATIONS SHALL APPLY TO ALL CHEMICAL METAL CLEANING WASTES TREATED AT THE
FACILITY. The treated wastewater from the chemical metal cleaning wastes operation may be
discharged through any permitted outfall. All limitations imposed upon outfall 006, with the
possible exception of pH,are applicable to any chemical metal cleaning waste discharges,and must
be met prior to their mixing with any other wastestream. For pH,if the wastestream is sent through
the conventional wastewater treatment facility(Outfall 002)prior to discharge,the limitation below
must be met at the outfall from the conventional wastewater treatment facility.
2. Continue submitting discharge monitoring reports electronically using NC DWR's eDMR
application system. See Special Condition A. (22.).
3. E:Effluent.
4. The pH shall not be less than 6.0 standard units or greater than 9.0 standard units.
MONITORING AND REPORTING UNDER THESE EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS IS REQUIRED
ONLY WHEN CHEMICAL METAL CLEANING IS PERFORMED.
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.
Page 7 of 16

Permit NC0024392
A. (6.) CLEAN WATER ACT SECTION 316(a) THERMAL VARIANCE (Outfall 001)
[40 CFR 125,Subpart H]
Unless this permit administratively continued, the thermal variance granted under Section 316(a) terminates on
expiration of this NPDES permit. Should the permittee wish a continuation of its 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.
The next 316(a)studies shall be performed in accordance with the 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.
Copies of all the study plans,study results,and any other applicable materials should be submitted to:
1) Electronic Version Only(pdf and thumb drive)
Division of Water Resources
WQ Permitting Section-NPDES
1617 Mail Service Center
Raleigh,NC 27699-1617
2) Electronic Version(pdf and thumb drive)and Hard Copy
Division of Water Resources
Water Sciences Section
1621 Mail Service Center
Raleigh,NC 27699-1621
A. (7.) ACUTE TOXICITY PASS/FAIL PERMIT LIMIT (QUARTERLY) (Outfall 001)
[15A NCAC 02B .0200 et seq.]
The permittee shall conduct acute toxicity tests on a quarterly basis using protocols defined in the North Carolina
Procedure Document entitled"Pass/Fail Methodology For Determining Acute Toxicity In A Single Effluent
Concentration" (Revised December 2010 or subsequent versions).The monitoring shall be performed as a
Ceriodaphnia dubia 24 hour static test.The effluent concentration at which there may be at no time significant
• acute mortality is 90% (defined as treatment two in the procedure document). The tests will be performed during
the months of February,May,August and November. These months signify the first month of each three month
toxicity testing quarter assigned to the facility. Effluent sampling for this testing must be obtained during
representative effluent discharge and shall beperformed at the NPDESpermitted final effluent discharge below
P g g
all treatment processes.
Should any single quarterly monitoring indicate a failure to meet specified limits,then monthly monitoring
will begin immediately until such time that a single test is passed.Upon passing,this monthly test
requirement will revert to quarterly in the months specified above.
Page 8 of 16

Permit NC0024392
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form(MR-1)for the month in which it was performed,using the parameter code TGE3B.
Additionally,DWR Form AT-2(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,North Carolina 27699-1621
Or, results can be sent to the email,ATForms.ATB®ncdenr.gov
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30 days after
the end of the reporting period for which the report is made.
Test data shall be complete and accurate and include all supporting chemical/physical measurements performed
in association with the toxicity tests,as well as all dose/response data. 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 will 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 toxicity monitoring is required,then monthly
monitoring will begin immediately until such time that a single test is passed.Upon passing,this monthly test
requirement will revert to quarterly in the months specified above.Assessment of 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 either of these monitoring requirements 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 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. (8.) ACUTE TOXICITY PERMIT LIMIT (QUARTERLY) (Outfall 002)
[15A NCAC 02B .0200 et seq.]
The permittee shall conduct acute toxicity tests on a quarterly basis using protocols defined in the E.P.A.
Document EPA/600/4-90/027 entitled"Methods for Measuring the Acute Toxicity of Effluents to Freshwater
and Marine Organisms."The monitoring shall be performed as a Ceriodaphnia dubia 48 hour static test.The
effluent concentration at which there may be at no time significant acute mortality is 80%(defined as treatment
two in the procedure document).Effluent samples for self-monitoring purposes must be obtained during
representative effluent discharge below all waste treatment.The tests will be performed during the months of
February,May,August,and November. These months signify the first month of each three month toxicity
testing quarter assigned to the facility. Effluent sampling for this testing shall be performed at the NPDES
permitted final effluent discharge below all treatment processes.
Page 9 of 16

Permit NC0024392
Should any single quarterly monitoring indicate a failure to meet specified limits,then monthly monitoring
will begin immediately until such time that a single test is passed.Upon passing,this monthly test
requirement will revert to quarterly in the months specified above.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form(MR-1)for the month in which it was performed,using the parameter code TAA3B.
Additionally,DWQ Form AT-2(original)is to be sent to the following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section
1621 Mail Service Center
Raleigh,North Carolina 27699-1621
Or,results can be sent to the email,[e-mail]
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30 days after
the end of the reporting period for which the report is made.
Test data shall be complete and accurate and include all supporting chemical/physical measurements performed
in association with the toxicity tests,as well as all dose/response data.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 will 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 Environmental Sciences Section at
the address cited above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required,then monthly
monitoring will begin immediately until such time that a single test is passed.Upon passing,this monthly test
requirement will revert to quarterly in the months specified above.
Should any test data from either these monitoring requirements 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.
If the Permittee monitors any pollutant more frequently then required by this permit,the results of such
monitoring shall be included in the calculation&reporting of the data submitted on the DMR&all AT Form
submitted.
NOTE: Failure to achieve test conditions as specified in the cited document,such as minimum control organism
survival 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. (9.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY) (Outfall 005)
[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 2.9%.
The permit holder shall perform at a minimum,quarterly monitoring using test procedures outlined in the"North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure,"Revised December 2010,or subsequent versions or
Page 10 of 16

Permit NC0024392
"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 February,May,August,and November.
These months signify the first month of each three-month toxicity testing quarter assigned to the facility.
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 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,North Carolina 27699-1621
Or,results can be sent to the email,[e-mail]
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30 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 will 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 toxicity monitoring is required,monitoring will be
required during the following month.Assessment of 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.
Page 11 of 16

Permit NC0024392
A. (10.) BEST MANAGEMENT PRACTICES
It has been determined from information submitted that the plans and procedures in place at McGuire Nuclear
Station are equivalent to that of Best Management Practice(BMP).
A. (11.) BIOCIDES [G.S. 143-215, 143-215.1]
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 of Water Resources. 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 those outfalls containing toxicity testing. Division approval is not necessary for the introduction of
a new biocide into an outfall currently being tested for toxicity.
A. (12.) CHEMICAL METAL CLEANING WASTES
The term"chemical metal cleaning waste" means any wastewater resulting from the cleaning of any metal
process equipment with chemical compounds including,but not limited to,boiler tube cleaning.
A. (13.) COMBINED WASTE STREAMS
In the event that waste streams from various sources are combined for treatment or discharge,the quantity of
each pollutant or pollutant property attributable to each controlled waste source shall not exceed the specified
limitation for that waste source.
A. (14.) FEDERAL INSECTICIDE,FUNGICIDE,AND RODENTICIDE ACT
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 wastes of the United States is
prohibited unless specifically authorized elsewhere in this permit. This requirement is not applicable to products
used for lawn and agricultural purposes. 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
and in sewage treatment is authorized.
A. (15.) INTAKE SCREEN BACKWASH --_
Continued intake screen backwash discharge is permitted without limitations or monitoring requirements.
However,the discharge of oil and grease is prohibited from this discharge.
A. (16.) TEMPERATURE MIXING ZONE (Outfall 001)
The mixing zone is defined as containing an area of no more than 3500 acres and lying upstream of the dam and
south of a line originating on the west bank of NC coordinates E-1,416,900 and N-633,600 and extending south 70-
00 east intersecting the point of land on the eastern shore. Water quality stream standards for temperature shall
be met outside the mixing zone.
A. (17.) OTHER DISCHARGES
The permittee is hereby authorized to discharge as follows:
a. The Cowans Ford Dam underdrain discharge to the Catawba River which includes
uncontaminated bearing lubrication and gland seal water,and possibly silt from cyclone
separators;and
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Permit NC0024392
b. Fire protection water(approved biocides only)to Lake Norman(Catawba River).
A. (18.) POLYCHLORINATED BIPHENYL COMPOUNDS
There shall be no discharge of polychlorinated biphenyl compounds such as those commonly used for
transformer fluid.
A. (19.) RADIOACTIVE MATERIAL
Releases of radioactive material shall be monitored and conducted in accordance with all conditions and
limitations required by the Nuclear Regulatory Commission(NRC)and as specified in the Final Safety Analysis
Report,Technical Specifications,and Environmental Statement for the McGuire Nuclear Station.
A. (20.) TOXICITY REOPENER
This permit shall be modified,or revoked and reissued to incorporate toxicity limitations and monitoring
requirements in the event toxicity testing or other studies conducted on the effluent or receiving stream indicate
that detrimental effects may be expected in the receiving stream as a result of this discharge.
A. (21.) CLEAN WATER ACT SECTION 316 (b)
[40 CFR 125.95]
Based on evaluation of the 316(b)study reports the Department concludes that the existing configuration at
McGuire represents BTA for meeting the impingement and entrainment requirements of the Rule.The permittee
shall continue to comply with the Cooling Water Intake Structure Rule per 40 CFR 125.95.
Nothing in this permit authorizes take for the purposes of a facility's compliance with the Endangered Species Act.
A. (22.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS (STATE
ENFORCABLE ONLY) [G.S. 143-215.1(b)]
Federal regulations require electronic submittal of all discharge monitoring reports(DMRs)and program reports
and specify that,if a state does not establish a system to receive such submittals,then permittees must submit
monitoring data and reports electronically to the Environmental Protection Agency(EPA). 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 Section D. (2.)and Section E. (5.) (a)1
Effective December 21,2016,the permittee shall report discharge monitoring data electronically using the NC
DWR's Electronic Discharge Monitoring Report(eDMR)internet application.
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Permit NC0024392
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.
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 21,2025,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:
http://www2.epa.gov/compliance/final-national-pollutant-discharge-elimination-sy stem-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
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Permit NC0024392
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://portal.ncdenr.org/web/wq/admin/bog/ipu/edmr
4. Signatory Requirements[Supplements 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://portal.ncdenr.org/web/wq/admin/bog/ipu/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 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 122.411
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Permit NC0024392
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Duke Energy Carolinas— McGuire Nuclear Station Facility Location (not to scale)
Outfall 001/004: Outfall 005:
Receiving Stream: Lake Norman Receiving Stream: Catawba River
Lat:35°26'03" Long:80°56'50" Lat:35°25'57" Long:80°57'20" A X
Outfall 002/006: I V
Receiving Stream: Catawba River
Lat:35°25'57" Long:80°57'20" NC0024392—Mecklenburg County
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