NC0005088_Technical Correction_20180810

A . w.o'er
ROY COOPER NORTH CAROLINA
Governor Environmental Quality
MICHAEL S.REGAN
Secretary
LINDA CULPEPPER
Interim Director
August 10, 2018
Mr. Paul Draovitch, Senior Vice President EH&S
Duke Energy Carolinas, LLC
526 Church St.
Mail Code: EC3XP
Charlotte,NC 28202
Subject: NPDES Permit Technical Correction
Permit NC00005088
Rogers Energy Complex
Cleveland&Rutherford Counties
Class II Facility—Sanitary WWTP
Dear Mr. Draovitch:
The Division issued a final permit for your facility on July 13, 2018. Upon your request the
Division is issuing technical corrections to the issued permit. The whole effluent toxicity test
sampling schedule for outfall 002 was changed to March, June, September and December to
align testing for outfalls 002 and 005 on the same schedule. The downstream sampling location
for the instream sampling requirements for outfall 005 will reflect the final location selected by
Duke to conduct the sampling, which is 650 feet downstream from outfall 005. Please replace
the attached pages in your permit. These changes become effective September 1, 2018.
All other terms and conditions in the original permit remain unchanged and in full effect. These
modifications are issued pursuant to the requirements of North Carolina General Statute 143-215.1
and the Memorandum of Agreement between North Carolina and the U.S. Environmental
Protection Agency dated December 6, 1983.
If any parts,measurement frequencies or sampling requirements contained in this modification are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within
thirty (30) days following receipt of this letter. This request must be in the form of a written
£D_EQ,„).
NORTMCOUNA
Department of
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street I)1611 Mail Service Center I Raleigh,North Carolina 27699-1611
919.707.9000

petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the
Office of Administrative Hearings, Post Office Drawer 11666, Raleigh, North Carolina 27604.
Unless such demand is made,this decision shall be final and binding.
If you have any questions concerning this permit, please contact Teresa Rodriguez at (919) 707-
3608 or email at [e-mail].
Sincerely,
• da Culpepper, Interim Director
ivision of Water Resources,NCDEQ
Hardcopy: NPDES Files
Central Files
Ecopy: DWR/Raleigh Regional Office/Water Quality Program
US EPA Region 4
DWR/Ecosystems Branch
DWR/Aquatic Toxicology Branch/Susan Meadows
£D_EQ)NORTH CAROLINA
UevaMRm of E>r�nmeNal Unal sry�
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11611 Mail Service Center I Raleigh,North Carolina 27699-1611
919.7079000

Permit No.NC0005088
Notes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR
application system. See Special Condition A. (28).
2. Sample Locations:E-Effluent from treatment system prior to mixing with other sources of wastewater,U-
upstream at the Station Intake,and D-downstream approximately 650 feet from the discharge.
3. Flow may be measured by pump logs.
4. Monitoring shall be per occurrence of chemical metal cleaning and sample shall be from a representative
discharge.
5. Chronic Toxicity(Ceriodaphnia)P/F at 3.14%;March,June,September,and December;See Special Condition
A. (11)of this permit.
6. The Division shall consider all effluent TRC values reported below 50 µg/L to be in compliance with the
permit. However,the permittee shall continue to record and submit all values reported by a North Carolina
certified laboratory(including field certified),even if these values fall below 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.
7. See Special Condition A. (27)Temperature Mixing Zone.
8. Monthly monitoring is required during normal operations and decanting, weekly monitoring during
dewatering.
9. The facility shall employ method 1631E.
10. 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.
Within 180 days of the commencement of operations of the treatment system the permittee shall submit Items V
and VI of NPDES application Form 2C.
All domestic wastewater produced at the power plant is to be fully treated through the onsite wastewater treatment
system prior to being discharged.
The permittee shall obtain authorization from the Division prior to using any biocide in the cooling water;see
condition A. (20).
There shall be no discharge of floating solids or foam visible in other than trace amounts.
See Special condition A. (29)Notification of Start-up.
Page 13 of 29

Permit No.NC0005088
A. (7.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Outfall 104 [15A NCAC 02B.0400 et
seq.,02B.0500 et seq.]
During the period beginning on the effective date of this permit and lasting until expiration,the Permittee is
authorized to discharge from outfall 104-constructed seep.Such discharges shall be limited and monitored)by
the Permittee as specified below:
Effluent Discharge Limitations Monitoring Requirements
Characteristics Monthly Daily Measurement Sample Sample
Average Maximum Frequency2 Type Location
Flow,MGD Monthly/Quarterly Estimate Effluent _
pH 6.0 to 9.0 S.U. Monthly/Quarterly Grab Effluent
TSS 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
Fluoride,µg/L Monthly/Quarterly Grab Effluent
Total Mercury3,ng/L Monthly/Quarterly Grab Effluent
Total Barium,mg/L Monthly/Quarterly Grab Effluent
Total Iron,µg/L Monthly/Quarterly Grab Effluent
Total Manganese,µg/L Monthly/Quarterly Grab Effluent
Total Zinc,µg/L Monthly/Quarterly Grab Effluent
Total Arsenic,µg/L Monthly/Quarterly Grab Effluent _
Total Cadmium,µg/L Monthly/Quarterly Grab Effluent
Total Chromium,µg/L Monthly/Quarterly Grab Effluent
Total Copper,µg/L Monthly/Quarterly Grab Effluent
Total Lead,µg/L Monthly/Quarterly Grab Effluent
Total Nickel,µg/L Monthly/Quarterly Grab Effluent
Total Selenium,µg/L Monthly/Quarterly Grab Effluent
Nitrate/nitrite as N, Monthly/Quarterly Grab Effluent
mg/L
Sulfates,mg/L Monthly/Quarterly Grab Effluent
Chlorides,mg/L Monthly/Quarterly Grab Effluent
TDS,mg/L Monthly/Quarterly Grab Effluent
Total Hardness,mg/L Monthly/Quarterly Grab Effluent
Turbidity4 Monthly/Quarterly Grab Effluent
Temperature,0C Monthly/Quarterly Grab Effluent
Conductivity,µmho/cm , Monthly/Quarterly Grab Effluent
Notes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application
system. See Special Condition A. (28).
2. The facility shall conduct monthly sampling from the effective date of the permit.After one year from the
effective date of the permit the monitoring will be reduced to quarterly.
3. The facility shall use EPA method 1631E.
4. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50 NTU. If the
instream turbidity exceeds 50 NTU due to natural background conditions,the discharge cannot cause turbidity
to increase in the receiving stream. Therefore,if the effluent measurement exceeds 50 NTU,the Permittee shall
sample upstream and downstream turbidity in the receiving waterbody,within 24 hours,to demonstrate the
existing turbidity level in the receiving waterbody was not increased.All data shall be reported on the DMRs.
(See 15A NCAC 2B .0211 (21)).
Page 14 of 29

Permit No.NC0005088
If no discharge occurs during the reporting period or the Permittee is unable to obtain a representative sample due
to low-flow conditions at the seep,the Permittee shall submit its DMR,as required, and indicate"No Flow" for the
seep outfall(15A NCAC 02B .0506(a)(1)(E)).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
A. (9.) CHRONIC TOXICITY PERMIT LIMIT(Quarterly) (Outfall 002-Ash Pond decanting) [15A NCAC
02B .0400 et seq., 02B .0500 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 7.7%.
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
"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. 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. 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,NC 27699-1621
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.
Page 17 of 29

Permit No.NC0005088
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.
A. (10.) CHRONIC TOXICITY PERMIT LIMIT(MONTHLY) (Outfall 002-Ash Pond Dewatering) [15A NCAC
02B.0400 et seq.,02B.0500 et seq.]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 0.5 %.
The permit holder shall perform at a minimum,monthly monitoring 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. 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,NC 27699-1621
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
Page 18 of 29