Loading...
HomeMy WebLinkAboutNC0003468_Draft Permit_20220726 ,;--- ST_+Tf o, ,, ,:,. ROY COOPER (,._ °�' o ' °, Governor ,,. y: ELIZABETH S.BISER Secretary ``s` N""' RICHARD E.ROGERS,JR. NORTH CAROLINA Director Environmental Quality July 26, 2022 Ms.Jessica Bednarcik, Senior Vice President Environmental,Health and Safety Duke Energy Carolinas,LLC Mail Code EC13K P.O. Box 1006 Charlotte,North Carolina 28201-1006 Subject: Draft NPDES Permit Permit NC0003468 Dan River Combined Cycle Station Rockingham County Facility Class I Dear Ms. Bednarcik: 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: • Once through cooling water and treated domestic wastewater have been removed from the list of authorized discharges. • The monitoring requirements for Mercury have been removed from the permit based on the results of the Reasonable Potential Analysis. • The monitoring requirements for Iron have been removed from the permit based on the elimination of the state standards for Iron. • The footnote associated with temperature requirement of once-through cooling system has p q g Y been removed from the permit due to the conversion to the closed-cycle cooling system. • The monitoring and limits for pH have been removed from internal Outfall 001A to be consistent with the requirements of 40 CFR 423. • The 316(a) variance has been removed from the permit and substituted with the Thermal Mixing Zone based on the new modeling information and due to the conversion to the closed- cycle cooling system. • The downstream sampling site was relocated closet to the discharge from 2 miles to 85 ft. based on the results of the thermal model. • The effluent temperature limit has been increased to 37.2°C from 35°C and was changed from Monthly Average to Daily Maximum based on the results of the thermal model. This change will make the limit more stringent because it will not allow any excursions above 37.2°C. D North Carolina Department of Environmental Quality I Division of Water Resources 512 North Salisbury Street 1 1611 Mail Service Center I Raleigh,North Carolina 2 7699-1 61 1 NOP 1 r�.,.,Ji dNA 919.707.9000 De ft porime of Em m lrar.,1.t o1 • The following permit conditions have been removed due to the elimination of the discharges associated with operations of the former coal ash ponds: 1. Effluent pages for Outfall 002. 2. Effluent pages for 3 seeps. 3. Chronic toxicity conditions for Outfall 002. 4. Special Condition for Structural Integrity of the Ash Pond Dam. 5. Special Condition for Instream Monitoring. 6. Special Condition for Applicable State Law—Senate Bill 729. 7. Special Condition for Discharge from Seepage. 8. Special Condition for Fish Tissue Monitoring Near Ash Pond Discharge(Outfall 002). Please provide any comments you have regarding the draft permit to this office by August 29, 2022. At this time,the Division is also publishing a notice in the newspapers of general circulation in Rockingham County,inviting public comment on the draft major modification. Following the 30-day comment period,we will review all pertinent comments received and take appropriate action on the permit modification. The NPDES Standard Conditions (Parts II,III,and IV) are not included with this draft. They can be found at the following link if you would like to review them in conjunction with this draft permit. https://bit.ly/2BZ4xxx If you have any questions about the NPDES permit process,please contact me at the following e- mail address: sergei.chernikov(a ncdenr.gov, or telephone number: 919-707-3606. Sincerely, Sergei Chernikov,Ph.D. Environmental Engineer III Complex NPDES Permitting Unit cc: NPDES Files EPA Region IV(e-copy) Winston-Salem Regional Office/ Surface Water Protection (e-copy) Aquatic Toxicology Unit(e-copy) TACU (e-copy) D -y� North Carolina Department of Environmental Quali ty I Division of Water Resources QJ� 512 North Salisbury Street 11611 Mail Service Cent er I Raleigh,North Carolina 27699-1611 �^ a 919.707.9000 Permit NC0003468 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 from a facility located at the Dan River Combined Cycle Station 864 South Edgewood Road Eden, NC Rockingham County to receiving waters designated as the Dan River in the Roanoke River Basin in accordance with effluent limitations, monitoring requirements, and other applicable conditions set forth in Parts I, II, and III hereof. This major modification shall become effective This major modification and 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 Page 1 of 9 Permit NC0003468 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 discharge the following: • Outfall 001: cooling tower blowdown from the combined cycle unit, intake screen backwash, and plant collection sumps (low volume wastes); • Internal Outfall 001A (discharges to Outfall 001): wastes from the filtered water plant including miscellaneous wash down water and laboratory wastes (low volume wastes); 2. Discharge from said treatment works at the location specified on the attached map into the Dan River (Outfall 001), classified C waters in the Roanoke River Basin. Page 2 of 9 Permit NC0003468 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 this permit and lasting until expiration, the permittee is authorized to discharge intake screen backwash, cooling tower blowdown, and plant collections sumps through Outfall 001. Such discharges shall be limited and monitored by the permittee as specified below: EFFLUENT LIMITS MONITORING REQUIREMENTS CHARACTERISTICS Monthly Daily Measurement Sample Sample Average Maximum Frequency Type Location' Flow, MGD Daily Pump Logs Effluent Temperature 37.2 °C Weekly Grab Effluent Temperature 32.0 °C 2 Weekly Grab Downstream Total Suspended Solids 30.0 mg/L 100.0 mg/L 2/Month Grab Effluent Oil and Grease 15.0 mg/L 20.0 mg/L 2/Month Grab Effluent pH 6.0 <_ pH <_ 9.0 2/Month Grab Effluent Total Residual Chlorine 3 28.0 µg/L 2/Month Grab Effluent Notes: 1. Sample locations: Downstream-downstream approximately 85 ft.; Effluent - at point downstream of combined wastewaters from the combined cycle turbine unit. 2. See Special Condition A. (6.) Temperature Mixing Zone. 3. Total Residual Chlorine (TRC) compliance is required only if chlorine or chlorine derivative is added to the cooling water. The Division shall consider all effluent TRC values reported below 50 µg/L to be in compliance with the permit. However, the permittee shall continue to record and submit all values reported by a North Carolina certified laboratory (including field certified), even if these values fall below 50 pg/L. The permittee shall obtain authorization from the Division of Water Resources prior to using any biocide in the cooling water; see condition A. (5.). There shall be no discharge of floating solids or foam visible in other than trace amounts. Page 3 of 9 Permit NC0003468 A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall OO1A) [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 wastewater from the filtered water plant including wash down water and laboratory wastes (low volume waste sources) through Internal Outfall OO1A. Such discharges shall be limited and monitored2 by the permittee as specified below: EFFLUENT LIMITS MONITORING REQUIREMENTS CHARACTERISTICS Monthly Daily Measurement Sample Sample Average Average Frequency Type Location' Total Suspended Solids 30.0 mg/L 100.0 mg/L 2/Month Grab Effluent Oil & Grease 15.0 mg/L 20.0 mg/L 2/Month Grab Effluent Notes: 1. Effluent sample location shall be at point downstream of the oil separator and prior to mixing with Outfall 001. Should no flow occur during a given month, the words "no flow" should be clearly written on the front of the DMR. All samples shall be a representative discharge. There shall be no discharge of floating solids or foam visible in other than trace amounts. Page 4 of 9 Permit NC0003468 A. (3.) TOXICITY RE-OPENER CONDITION [15A NCAC 02B .0200 et seq.] This permit shall be modified, or revoked and reissued, to incorporate additional toxicity limitations and monitoring requirements in the event that 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. (4.) SPECIAL CONDITIONS [NCGS 143-215.3 (a) (2) and NCGS 143-215.66] The following special conditions are applicable to all outfalls regulated by this permit: a) There shall be no discharge of polychlorinated biphenyl compounds such as those once commonly used for transformer fluid. b) Nothing contained in this permit shall be construed as a waiver by the permittee of any right State or Federal laws or regulations. to a hearingit mayhave pursuant to gu to ste c) Discharge of any waste resulting from the combustion of toxic or hazardous waste any waste stream which ultimately discharges to waters of the United States is prohibited, unless specifically authorized in this permit. d) The permittee shall report all visible discharges of floating materials (such as an oil slick) to the Director when submitting DMRs. e) "Upset," means an exceptional incident in which there is an unintentional and temporary non-compliance with technology-based effluent limitations because of factors beyond the reasonable control of the permittee. An upset does not include noncompliance to the extent caused by operational error, improperly designed treatment facilities, inadequate treatment facilities, lack of preventative maintenance, or improper operations. f) All flows shall be reported on monthly DMRs. Should no flow occur during a given month, the words "no flow" should be clearly written on the front of the DMR. g) EPA methods 200.7 or 200.8 (or the most current versions) shall be used for analyses of all metals except for total mercury. h) All effluent samples for all external outfalls shall be taken at the most accessible location after the final treatment but prior to discharge to waters of the U.S. (40 CFR 122.41(j)). i) The term low volume waste sources means wastewater from all sources except those for which specific limitations are otherwise established in this part (40 CFR 423.11 (b)). j) 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)). k) 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)). 1) For all outfalls where the flow measurement is to be "estimated" the estimate can be done by using calibrated V-notch weir, stop-watch and graduated cylinder, or other method approved by the Division. m) The concentration of asbestos in any wastewater shall not exceed 7 million fibers per liter. A. (5.) BIOCIDE CONDITION [NCGS 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 Page 5 of 9 Permit NC0003468 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 new biocides into outfalls currently tested for whole effluent toxicity. A. (6.) TEMPERAURE MIXING ZONE [NCGS 143-215.1] The temperature mixing zone is defined as the area extending from outfall 001 to approximately 143 feet below the discharge. The discharge shall not result in acute toxicity to aquatic life, prevent free passage of aquatic organisms around the mixing zone, result in offensive conditions, produce undesirable aquatic life or result in a dominance of nuisance species outside of the assigned mixing zone; or endanger the public health or welfare. b) The temperature standard of 32°C (89.6°F) and the maximum temperature increase above natural temperature of 2.8°C (5.04°F) shall be met at the end of the mixing zone. The natural water temperature shall be the temperature measured at the upstream sampling location. The increase in temperature is defined as the difference in temperature between the upstream and downstream sampling locations. c) The results of all temperature monitoring shall be reported in the monthly DMRs. When possible, instream monitoring for temperature shall be performed during times the facility is operating at full loading. d) After 12 months of temperature data are collected the permittee shall submit a report to the Division to verify the Cormix model predicti ons. The report shall include field verification of assumptions used in the model and a summary of temperature data for effluent, upstream and downstream and shall be submitted to: Division of Water Resources WQ Permitting Section - NPDES 1617 Mail Service Center Raleigh, NC 27699-1617 e) Once during the permit term the permittee shall perform an assessment to verify that the mixing zone does not prevent the passage of aquatic organisms around the mixing zone. A study plan shall be submitted to the Division prior to commencement of the study to the following address: Division of Water Resources Division of Water Resources WQ Permitting Section- NPDES Water Sciences Section 1617 Mail Service Center 1623 Mail Service Center Raleigh, NC 27699-1617 Raleigh, NC 27699-1623 f) This permit may be reopened to implement alternative temperature limits or requirements based on the results of the data collected. A. (7.) 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 this facility 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. Page 6 of 9 Permit NC0003468 A. (8.) 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 Section D. (2.) and Section E. (5.) (all 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 DENR / 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. Page 7 of 9 Permit NC0003468 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- pollu tant-di scharge-elim inatio n-system-npdes-electronic-repo rting-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 Section B. (11.) (b) and Supersedes Section B. (11.) (d)l All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II, Section B. (11.)(a) or by a duly authorized representative of that person as described in Part II, Section B. (11.)(b). A person, and not a position, must be delegated signatory authority for eDMR reporting purposes. For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user account and login credentials to access the eDMR system. For more information on North Carolina's eDMR system, registering for eDMR and obtaining an eDMR user account, please visit the following web page: http://deq.nc.gov/about/divisions/water-resources/edmr Page 8 of 9 Permit NC0003468 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.)l 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]. A. (9.) 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. 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. The compliance boundary map for this facility is incorporated herein and attached hereto as attachment. Page 9 of 9 r0:04t4-4.11ilz,--<J,c,_\-:-.._-_-1 ,N-l e ,fir" l ! '? �`(r " (i).--'..-k-I,7,(`\\, „�j / G__,• lam � \. :..fi\ 0 Il 14\(\ \- ){f'`\ - w --�►j,,� , r ��-N.®el\nd1.ins!W Ponds ;L;.� ° _�,�, : err Q , , {-; ,. Ki � ,.DpID _,b �_1• rf+ ' yI •a � {1 \-._..'gay'�'.' µt \ allitk, . .: 17".11-A :PI , 11:.:•reiti. — iip , -- 481r 1 0 i 4. ''' , . •'j '''• (--'\'' ..i 3, : dor , : --'114 . 4''-o. ;111•V ___J- ....0644...._,...hilk 64"6,., 5 •. '`..7.----'"''1 .. ,c, 1".°8 --db I '': ' ' )' ' ir A ilk"7- ••.0, 4r ..-g\_, ......_ , •I b- cy ...i A VitIOtiitt, ; -- A 14f/1," .----. )-s'Z-(-----`-‘ `I r �� 4 Outfall 001A _t'',-"-‘)f-"^: , '' 1 •C , i s mil' 0. ( 1 =it 6-,‘-.% , / Outfall 001 . V fie; % / _ �� -, 1 �, \ / ' , �111111 �a` d �! \', Nr. x o ,00 .),\ ' . 1C-fi ' • ' - NI ‘-' `(-‘ ,.. 0 --,'- r\i ‘:i/ .. T _.,,,,.... ,..72, ‘.. . ..,1 - f )( IV • V '� ✓ rah �( i�� 0 h- ...,-,-,,, . titii4i.1 c-., . It P S.'4 i_l_\ \ 's 1 ' -IA *cf,cm \,,,--. ° -,-_-_ o, c. ------/-, i -i 'i),, A .411e , - It .-- ---f./S' . . C l' '')1\r.\''';44:.C- **lir/ --.7: .,' ------- 0 ss...I 01 (1.---t. . 9 '_10K. - \\*......_...s‘s_ _ ... f L ,./•,:i_, .. , l'i,((:-'-- -*-4-\-7::>-\`'. ..1.7 .• ' ' ' '' Ili ''''' . . — >ID . .,- - k Se ' --)': 4 ' • -ii-..,,, „ 1,1.. . <_:--4‘, 5- ',') '17.I ' _3.4;• -.). -':-.:;"-Ir'-' ^(i- '\ C , c )(/ ). -c <;---c-''. ' l'. i'__, ''<....i 1 41!-- ,..,.!_iii(,,,,tik ''r_le,-,4/463_ . ' ', 4._ \11-‘,.--:\ •IL'—•:-I'C' I --0' ..'----4 7"Alk- 7.-r, ---\,\\*-,-.4,-3, / _ P ./; erh'' . ; '-:)) -- * At3J \\I 4ZA '11r--7 r• i r*fly '. -,-I.s• --�� , O J: - ..<1\f... ,..„ :4_.... , -\. ..., , , IL , < ‘,6,,, ti.., , li, , ,_ ,., ,_ . , , � � /�(2` .,i rf1� jw°7 yY '-c_,__s_vr 11 _c,�N �. c {: "� ,l� cep USGS Quad: B2ONW Southeast Eden, NC �� Outfall 001 l_i Latitude: 36° 29' 7.9" N I Longitude: 79° 43' 13.9" W Subbasin: 03-02-03 HUC: 03010103 North Facility Location Stream Class: C Duke Energy Carolinas - Dan River Station Receiving Stream: Dan River NPDES Permit No. NC0003468 Rockingham County Attachment A • -;w. ",' /'. 1 • 1 1 � . ". 1 ` f t 1 ; LEGEND BASIN COMPLIANCE _C.:: COMPLIANCE eOurvoARv •� FIGURE I . ..9 ."i..•• � WASTE AND COMPLIANCE BOUNDARIES Q u LANDP WASTE BOUNDARY f 0 TATION UNMILLOOMPUArvCE BOUNDARY . DANRIERGR Y CAR LINAS,L �ynTena DUKE ENERGY CAROLINAS,LLC ASH STORAGE BOOMARY 1 '• ` - EDEN,NORTH CAROLINA r..J PLANT eounARr ✓ .• - . .,.....,,.,.....,.............,,.......,..a..,a..,....,.....,.,.,.....