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Home My WebLink AboutNC0025534_Draft Permit_20170712Water Resources ENVIRONMENTAL QUALITY July 12, 2017 Lee Smith, Water & Sewer Utilities Director City of Hendersonville 305 Williams Street Hendersonville, North Carolina 28792 Dear Mr. Smith: ROY COOPER CVV MCY MICHAEL S. REG AN S. JAI' ZIMMERMAN A7 wor Subject: Draft NPDES Permit Renewal Permit NCO025534 Hendersonville WWTP, Class 4 Henderson County SIC Code 4592 Enclosed with this letter is a copy of the Draft NPDES permit renewal for your facility. Please review this draft carefully to ensure thorough understanding of the requirements and conditions it contains. There are several changes from the existing permit, including the following: • The NC 2007-2014 Water Quality Standard (WQS) Triennial Review was approved by the NC Environmental Management Committee (EMC) on November 13, 2014. The US EPA subsequently approved the WQS revisions on April 6, 2016 with some exceptions. The NC Division of Water Resources NPDES Permitting Unit is required to implement the new dissolved metal standards in all permits public noticed after April 6, 2016. The new standards for most metals include acute standards. Further, the freshwater standards for several metals are expressed as the dissolved form of the metals, and seven metals have hardness -dependent equations. As a result, the NPDES Permitting Unit will need site- specific effluent hardness data and instream hardness data, upstream of the discharge, for each facility monitoring these metals in order to calculate permit limitations. Effluent hardness and instream hardness sampling, upstream of the discharge, has been added to this permit at a monitoring frequency of quarterly. [See Specific Conditions A. (1.) and A. (2.) Effluent Limitations and Monitoring Requirements.] Effluent mercury data was reviewed from January 2012 to September 2016. The Permittee tested effluent mercury using EPA test Method 1631 E throughout this period. In accordance with the 2012 Mercury TMDL NPDES Guidance, the Permittee needs to show annual mean effluent concentrations below both the Water Quality Based Effluent Limitation (WQBEL) of 68.3 ng/L and the Technology Based Effluent Limitation (TBEL) State of North Carolina I Environmental Quality I Water Resources 1617 Mail Service Center I Raleigh, North Carolina 27699-1617 919 807 6300 Page 12 of 47 ng/L. A review of the data showed that the annual averages were below both the WQBEL and the TBEL, therefore, no mercury limitation is required. Eighteen (18) out of 21 low level effluent mercury samples collected were over 1 ng/L. As a result, a Mercury Minimization Plan (MMP) requirement has been added to this permit renewal. See Special Condition A. (7.). Please note that the Permittee shall develop and implement a MMP during this permit term. The MMP shall be developed within 180 days of the NPDES Permit Effective Date, and shall be available for inspection on- site. A sample MMP was developed through a stakeholder review process and has been placed on the Division website for guidance (http://portal.nedenr.org/web/wq/swp/ps/npdes, under Model Mercury Minimization Plan). i Based on the new WQS approved on April 6, 2016 for dissolved metals, a monthly average limit of 37.5 µg/L and a daily maximum limit of 42.8 µg/L for Total Copper have been added to the permit for the facility expansion to 6.0 MGD permitted flow, and samples shall be taken monthly upon expansion. Results of a reasonable potential analysis on submitted data indicated a reasonable potential to exceed the instream WQS. • Quarterly monitoring for Total Nickel and Total Copper (Copper at the current 4.8 MGD permitted flow only) are retained in the permit. Results of a reasonable potential analysis on submitted data indicated no reasonable potential to exceed the water quality standard of each pollutant in the receiving stream, but the maximum predicted concentration of each pollutant was greater than 50% of its respective allowable concentration. • Monitoring for Total Zinc has been deleted from the permit, but quarterly monitoring shall continue as part of the Long Term Monitoring Program. Results of a reasonable potential analysis on submitted data indicated no reasonable potential to exceed the water quality standards in the receiving stream. • Review of submitted effluent data showed all samples for Total Silver to be less than detection at 5 gg/L. In accordance with 15A NCAC 2B .0500, all test procedures must produce detection and reporting levels that are below the permit discharge requirements and all data generated must be reported to the approved detection level or lower reporting level of the procedure. Currently, DWR's laboratory identifies the Practical Quantification Limit (PQL) for Total Silver at < 1 µg/L. The allowable discharge concentration for Total Silver at your facility is 0.34 pg/L as a monthly average. Therefore, the best your facility can do is to sample for Total Silver down to the lower reporting level of the procedure, which is < 1 pg/L. Quarterly Total Silver effluent sampling has been added to your permit. The City should implement "clean" sampling techniques and have silver analyzed down to the PQL of < 1 µg/L. • Monitoring and limits for Total Residual Chlorine (TRC) have been deleted from the permit in recognition that the facility does not use chlorination for disinfection. Page 13 Monitoring for Bis(2-ethylhexyl)phthalate have been deleted from the permit, in agreement with the request of the Permittee. Review of submitted data indicated no detected concentrations above 5 pg/L. Frequency of the Effluent Pollutant Scan have been reduced from annually to three years within the permit term per 40 CFR 122. Effluent Pollutant Scans shall be sampled in years 2018, 2019 and 2020. [See Special Condition A. (5.).] 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. The requirement to begin reporting discharge monitoring data electronically using the NC DWR's Electronic Discharge Monitoring Report (eDMR) internet application has been added to your final NPDES permit. [See Special Condition A. (6.).] For information on eDMR, registering for eDMR and obtaining an eDMR user account, please visit the following web page: hlW:Hdeg.nc.gov/about/divisions/water- resources/edmr. For more information on EPA's final NPDES Electronic Reporting Rule, please visit the following web site: httys://www.federalre 'ster.gov/documents/2015/10/22/2015- 24954/national-pollutant-discharge-elimination-system-npdes-electronic-reporting-rule. Please note that the receiving stream is listed as impaired for benthos and fish community on the North Carolina 2014 303(d) Impaired Waters List. Addressing impaired waters is a high priority with the Division, and instream data will continue to be evaluated. If there is noncompliance with permitted effluent limits and stream impairment can be attributed to your facility, then mitigative measures may be required. Concurrent with this notification the Division is publishing a notice in a newspaper having circulation in the general Henderson County area, soliciting public comments on this draft permit. Please provide any written comments you may have to the following: NCDEQ/DWR, NPDES Permitting Branch, 1617 Mail Service Center, Raleigh, NC 27699-1617 no later than 30 days after receipt of this draft permit. Following the 30 -day public comment period, the Division will review all pertinent comments and take appropriate action prior to issuing a final permit. If you have questions concerning this draft permit, please call me at (919) 807-6385 or by email at gary.perlmutter@ncdenr.gov. Sincerely, �Z�XD Gary Perlmutter, Environmental Senior Specialist NPDES Complex Permitting Unit Page 14 Hardcopy: NPDES Files eCopy: US EPA Region 4 DWR / Operator Certification Unit / Maureen Kinney DWR / Aquatic Toxicology Branch / Susan Meadows DWR / Asheville Regional Office / Water Quality Operations Permit NCO025534 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 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, the City of Hendersonville is hereby authorized to discharge wastewater from a facility located at the Hendersonville WWTP 99 Balfour Road Hendersonville, NC 28792 Henderson County to receiving waters designated as Mud Creek in the French Broad River Basin in accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III and IV hereof. This permit shall become effective XXXX 1, 2017. This permit and authorization to discharge shall expire at midnight on March 31, 2021. Signed this day XXXX 1, 2017. V aA F T S. Jay Zimmerman, P.G. Division of Water Resources By Authority of the Environmental Management Commission Permit NC0025534 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. The City of Hendersonville is hereby authorized to: 1. Continue to operate an existing 4.8 MGD wastewater tratment system consisting of the following: ♦ Influent pump station ♦ Dual mechanical bar screens ♦ Dual grit chamber ♦ Dual aeration basins ♦ Three centrifugal blowers, ♦ Dual clarifiers ♦ Recycle pump stations ♦ Dual effluent filters �. ♦ Ultraviolet disinfection ♦ Dual gravity thickeners ♦ Sludge dewatering The facility is located at the Henderson Wastewater Treatment Plant, 99 Balfour Road, near Balfour, in Henderson County; 2. Upon issuance of an Authorization to Construct permit from the Division of Water Quality and submission of the engineers' certification for expansion, operate a wastewater treatment facility up to a design flow of 6.0 MGD (Phase II construction); and 3. Discharge from said treatment works at the location specified on the attached map into Mud Creek, classified C waters in the French Broad River Basin. Page 2 of 17 Permit NCO025534 PART I A.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (4.8 MGD) [ 15A NCAC 02B .0400 et seq., 02B .0500 et seq.] a. During the period beginning on the effective date and lasting until expansion above 4.8 MGD, the Permittee is authorized to discharge treated wastewater from Outfa❑ 001. Such discharges shall be limited and monitored' by the Permittee as specified below: All footnotes are listed on the following page. Page 3 of 17 LIMITS MONITORING REQUIREMENTS EFFLUENT Monthly Weekly Daily Measurement Sample Sample Location2 CHARACTERISTICS Average Average Maximum Frequency Type Flow 4 8 MGD Continuous Recording Influent or Effluent BOD, 5 -day, 20°C (Summer between April 1 through October 10 0 mg/L 15 0 mg/L Daily Composite Influent & Effluent 31)3 y BOD, 5 -day, 20°C (Winter between November 1 through 20 0 mg/L 30 0 mg/L,/ �� Daily Composite Influent & Effluent March 31)3 �aY �li Total Suspended Solids (TSS) 3 30 0 mglL 45 0 mglL �' Dad y Composite p Influent & Effluent NH3 as N (Summer between 2 0 mg/L 6 0 mg/L �,� _A Daily Composite Effluent April 1 through October 31) NH3 as N (Winter between 4 0 mg/L 12 0 mg/L t Daily Composite Effluent November 1 through March 31) Dissolved Oxygen Daily Average >_ 5 0 mg/L Daily Grab Effluent Fecal Coliform (geometric mean)f 200/100 mL I 400/100 mL Daily Grab Effluent pH Between 6 0 and 9 0 Standard Units Daily Grab Effluent Temperature (°C) Monitor and Report Daily Grab Effluent Total Nitrogen (mg/L)4 Monitor and Report Quarterly Composite Effluent Total Phosphorus (mg/L) Morntor and Report Quarterly Composite Effluent Total Copper (µg/L) Monitor and Report Quarterly Composite Effluent Total Nickel (µg/L) Monitor and Report Quarterly Composite Effluent Total Silver (µg/L)5 Monito(and Report Quarterly Composite Effluent Total Hardness as [CaCO3 or Monitor and Report P Quarter' Y Composite P Effluent (Ca + Mg)] (mg/L)6 Chronic Toxicity? Quarterly Composite Effluent Effluent Pollutant Scan Monitor and Report Footnote 8 Footnote 8 Effluent Total Hardness as [CaCO3 or Monitor and Report Quarterly Grab Upstream + M9)] (m9/L)9 Temperature (°C)10 Footnote 10 Grab Upstream, Downstream Fecal Coliform Footnote 10 Grab Upstream, (No colonies/100 mL)10 Downstream Dissolved Oxygen (mg/L)10 Footnote 10 Grab Upstream, Downstream All footnotes are listed on the following page. Page 3 of 17 Permit NC0025534 Footnotes: 1. Submit discharge monitoring reports electronically using NC DWR's eDMR application system. See Special Condition A (6.). 2. Upstream is in Mud Creek above outfall. Downstream is at NCSR 1365. 3. The monthly average effluent BODS and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal). 4. Total Nitrogen = TKN + NO3-N + NO2-N, where TKN is Total Kjeldahl Nitrogen, NO3-N is Nitrate Nitrogen, and NO2-N is Nitrite Nitrogen. 5. Total Silver samples should be analyzed to the lower detection limit approximately to < 1 µg/L. 6. Effluent Total Hardness sampling should be performed in conjunction with metals sampling. 7. Whole Effluent Toxicity shall be monitored using the Pass/Fail Chronic Toxicity test using Ceriodaphnia at 18% effluent. Samples shall be taken in February, May, August & November; see Special Condition A. (3.). 8. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit; see Special Condition A. (5.). 9. The Permittee shall sample mstream Total Hardness, upstream 'of the facility's discharge. The sample shall be representative of the hardness in the receiving stream: 10. Samples shall be collected three times per week from June 1 through September 30 and once per week from October 1 through May 31. ` b. There shall be no discharge of floating solids or visible foam in other than trace amounts Page 4 of 17 Permit NCO025534 A.(2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (6.0 MGD) [ 15A NCAC 02B.0400 et seq., 02B 0500 et seq.] a. Beginning upon the receipt of the Engineer's Certification for completion of the 6.0 MGD expansion and lasting until expiration, the Permittee is authorized to discharge treated wastewater from Outfall 001. Such discharges shall be limited and monitored' by the Permittee as specified below: All footnotes are listed on the following page. Page 5of17 LIMITS MONITORING REQUIREMENTS EFFLUENT Monthly Weekly Daily Measurement Sample Sample Location2 CHARACTERISTICS Average Average Maximum Frequency Type Flow 6 0 MGD Continuous Recording Influent or Effluent BOD, 5 -day, 20°C (Summer between April 1 through October 10 0 mg/L 15 0 mg/L Daily Composite Influent & Effluent 31)3 BOD, 5 -day, 20°C (Winter between November 1 through 20 0 mg/L 30 0 mg/L Daily Composite Influent & Effluent March 31)3 Total Suspended Solids (TSS)3 30 0 mg/L 45 0 mg/L Daily Composite Influent & Effluent NH3 as N (Summer between 2 0 mg/L 6 0 mg/L Daily Composite Effluent April 1 through October 31) NH3 as N (Winter between 4 0 mg/L 12:0 mg/L Daily Composite Effluent November 1 through March 31) Dissolved Oxygen (DO) Daily Average z 5.0 mg/L Daily Grab Effluent Fecal Coliform (geometric mean) 200/100 mL 400/100 mL Daily Grab Effluent pH Between 6 0 and 9 0 Standard Units Daily Grab Effluent Temperature (°C) Monitor and Report Daily Grab Effluent Total Nitrogen (mg/L)4 Monitor and Report Quarterly Composite Effluent Total Phosphorus (mg/L) Monitor and Report Quarterly Composite Effluent Total Copper 37 5 µg/L 42 8µg/L I Monthly Composite Effluent Total Nickel (µg/l-) Monitor and Report Quarterly Composite Effluent Total Silver (µg/L)5 Monitor and Report Quarterly Composite Effluent Total Hardness as [CaCO3 or Monitor and Report Quarterly Composite Effluent (Ca + Mg)] (m9/L)s Chronic Toxicity? Quarterly Composite Effluent Effluent Pollutant Scan Monitor and Report Footnote 8 Footnote 8 Effluent Total Hardness as [CaCO3 or Monitor and Report Quarterly Grab Upstream (Ca + Mg)] (mg/L)9 Temperature (°C)10 Footnote 10 Grab Upstream, Downstream Fecal Coliform Footnote 10 Grab Upstream, (No colonies/100 mL)10 Downstream Dissolved Oxygen (mg/L)10 Footnote 10 Grab Upstream, Downstream All footnotes are listed on the following page. Page 5of17 Permit NCO025534 Footnotes: 1. Submit discharge monitoring reports electronically using NC DWR's eDMR application system. See Special Condition A (6.). 2. Upstream is in Mud Creek above outfall. Downstream is at NCSR 1365. 3. The monthly average effluent BODS and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal). 4. Total Nitrogen = TKN + NO3-N + NO2-N, where TKN is Total Kjeldahl Nitrogen, NO3-N is Nitrate Nitrogen, and NO2-N is Nitrite Nitrogen. 5. Total Silver samples should be analyzed to the lower detection limit approximately to < 1 µg/L. 6. Effluent Total Hardness sampling should be performed in conjunction with metals sampling. 7. Whole Effluent Toxicity shall be monitored using the Pass/Fail Chronic Toxicity test using Ceriodaphnia at 21 % effluent. Samples shall be taken in February, May, August & November; see Special Condition A. (4.). 8. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit; see Special Condition A. (5.). 9. The Permittee shall sample mstream Total Hardness, upstream of the facility's discharge. The sample shall be representative of the hardness in .the receiving stream. 10. Samples shall be collected three times per week from June4 through September 30 and once per week from October 1 through May 31. b. There shall be no discharge of floating solids or visible foam/ in other than trace amounts Page 6 of 17 Permit NCO025534 A. (3.) CHRONIC TOXICITY PERMIT LIMIT (Quarterly) — 4.8 MGD [I 5A 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 18%. The permit holder shallperform 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 Il 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 Chronic Value (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 TGP313 for the pass/fail results and THP313 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 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. Page 7 of 17 Permit NC0025534 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. i Permit NCO025534 A.(4.) CHRONIC TOXICITY PERMIT LIMIT (Quarterly) —upon expansion [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 21 %. 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 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 Chronic Value (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. 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. Page 9 of 17 Permit NCO025534 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 10 of 17 F fr � T fl \ It u t Page 10 of 17 Permit NCO025534 A.(5.) EFFLUENT POLLUTANT SCAN (Municipal POTWs) [G.S. 143-215.1(b)] The Permittee shall perform a total of three (3) Effluent Pollutant Scans for all parameters listed below. One scan must be performed in each of the following years: 2018, 2019, and 2020. Analytical methods shall be in accordance with 40 CFR Part 136 and shall be sufficiently sensitive to determine whether parameters are present in concentrations greater than applicable standards and criteria. Samples should be collected with one quarterly toxicity test each year, and must represent seasonal variation [i.e., do not sample in the same quarter every year]. Unless otherwise indicated, metals shall be analyzed as "total recoverable." Ammonia (as N) Trans-l,2-dichloroethylene Bis (2-chloroethyl) ether Chlorine (total residual, TRC) 1, 1 -dichloroethylene Bis (2-chloroisopropyl) ether Dissolved Oxygen 1,2-dichloropropane Bis (2-ethylhexyl) phthalate Nitrate/Nitnte 1,3-dichloropropylene 4-bromophenyl phenyl ether Kjeldahl Nitrogen (TKN) Ethylbenzene Butyl benzyl phthalate Oil and Grease Methyl brom�ideo� 2-chloronaphthalene Phosphorus Methyl chloride 4-chlorophenyl phenyl ether Total Dissolved Solids Methylene'chlonde Chrysene Hardness 1,1,2,2-tetrachloroethane',,�, Di -n -butyl phthalate Antimony Tetrachloroethylene �� - Di phthalate Arsenic Toluene Dibenzo(a,h)anthracene Beryllium 1, 1, 1 -tnchloroethan 1,2 -dichlorobenzene Cadmium 1,1,2 -trichloroethane 1,3 -dichlorobenzene Chromium Trichloroethylene �¢,� 1,4 -dichlorobenzene Copper Vinyl chloride.;3,3-dichlorobenzidine Lead Acid -extractable compounds: Diethyl phthalate Mercury (EPA Method.1631E) rY P -chloro -m -cresol Dimethyl phthalate Nickel , 2 -chlorophenol 2,4-dmitrotoluene Selenium °2,4=dichlorophenol 2,6-dimtrotoluene Silver "� 2,4 -dimethylphenol 1,2-diphenylhydrazme Thallium 4,6-dmitr07o7cresol Fluoranthene Zinc r 2,4-dinitrophenol Fluorene Cyanide . 2-rntrophenol Hexachlorobenzene Total Phenolic Compounds 4-nitrophenol Hexachlorobutadiene Volatile organic compounds: Pentachlorophenol Hexachlorocyclo-pentadiene Acrolem Phenol Hexachloroethane Acrylonitrile 2,4,6 -trichlorophenol Indeno(1,2,3-cd)pyrene Benzene Base -neutral compounds: Isophorone Bromoform Acenaphthene Naphthalene Carbon tetrachloride Acenaphthylene Nitrobenzene Chlorobenzene Anthracene N-mtrosodi-n-propylamme Chlorodibromomethane Benzidine N-nrtrosodimethylamme Chloroethane Benzo(a)anthracene N-mtrosodiphenylamme 2-chloroethylvmyl ether Benzo(a)pyrene Phenanthrene Chloroform 3,4 benzofluoranthene Pyrene Dichlorobromomethane Benzo(ghi)perylene 1,2,4-tnchlorobenzene 1, 1 -dichloroethane Benzo(k)fluoranthene 1,2-dichloroethane Bis (2-chloroethoxy) methane Page 11 of 17 Permit NCO025534 Reporting. Test results shall be reported on DWR Form -A MR-PPA1 (or in a form approved by the Director) by December 31St of each des_gnated sampling year. The report shall be submitted to the following address: NC DEQ / DWR / Central Files, 1617 Mail Service Center, Raleigh, North Carolina 27699-1617. Additional Toxicity Testing Requirements for Municipal Permit Renewal. Please note that Municipal facilities that are subject to the Effluent Pollutant Scan requirements listed above are also subject to additional toxicity testing requ_rements specified in Federal Regulation 40 CFR 122.210)(5). The US EPA requires four (4) toxicity tests for a test organism other than the test species currently required in this permit. The multiple species tests should be conducted either quarterly for a 12 -month period prior to submittal of the permit renewal application, or four tests performed at least annually in the four and one half year period prior to the application. These tests shall be performed for acute or chronic toxicity, whichever is specified in this permit. The multiple species toxicity test results shall be filed with the Aquatic Toxicology Branch at the following'addre North Carolina Division of Water Resources'f Water Sciences Section/Aquatic Toxicology Branch 1621 Mail Service Center Raleigh, North Carolina 27699-1621 Contact the Division's Aquatic Toxicology Branch at 919,-743-8401 for guidance on conducting the additional toxicity tests and reporting requirements. Results should also be summarized in Part E (Toxicity Testing Data) of EPA Municipal Application Form 2A, when submitting the permit renewal application to the NPDES Permitting Unit. Page 12 of 17 Permit NCO025534 A.(6.) ELECTRONIC REPORTING OF 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.) (a)] The permittee shall report discharge monitoring data electronically using the NC DWR's Electronic Discharge Monitoring Report (eDMR) internet application. Monitoring results obtained during the previous month(s) shall be summarized for each month and submitted electronically using eDMR. The eDMR system allows permitted facilities to enter monitoring data and submit DMRs electronically using the internet Until such time that the state's eDMR application is compliant with EPA's Cross -Media Electronic Reporting Regulation (CROMERR), permittees will be required to submit all discharge monitoring data to the state electronically using eDMR and will be required to complete the eDMR submission by printing, signing, and submitting one signed original and a copy of the computer printed eDMR to the following address - NC DEQ / Division of Water Resources / Water Quality Permitting Section ATTENTION: Central Files 1617 Mail Service Center Raleigh, North Carolina 27699-1617 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 anew 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 - Page 13 of 17 Permit NCO025534 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 CER 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.federaIregister.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 five (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 Page 14 of 17 Permit NC0025534 4. Simatory 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://deg.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 Section D. (6.)] The permittee shall retain records of all Discharge Monitonng Reports, including eDMR submissions. These records or copies shall be maintained for a period of at least three (3) years from the date of the report. This period may be extended by request of the Director at any time [40 CFR 122.41]. Page 15 of 17 Permit NCO025534 A. (7.) MERCURY MINIMIZATIOl! PLAN (MMP) [G.S. 143-215.1 (b)] The permittee shall develop and implement a Mercury Minimization Plan (MMP) during this permit term. The MMP shall be developed within 180 days of the NPDES Permit Effective Date, and shall be available for inspection on-site. A sample MMP was developed through a stakeholder review process and has been placed on the Division website for guidance (http://deg.nc.gov/about/divisions/water- resources/water-resources-permits/wastewater-branch/npdes-wastewater-permits, under Model Mercury Minimization Plan). nae MMP should place emphasis on identification of mercury contributors and goals for reduction. Results shall be summarized and submitted with the next permit renewal. Performance of the Mercury Minimization Plan will meet the requirements of the TMDL (Total Maximum Daily Load) for mercury approved by USEPA on October 12, 2012, unless and until a Waste Load Allocation specific to this facility is developed and this NPDES permit is amended to require further actions to address the Waste Load Allocation. Page 16 of 17 Permit NCO021709 {ff��,,��,�CCss�.••^^ ' 4Jh, i _� ti .moi r' �.: :�Y' �- �� F �' 6+.y r�:y;� e �1 � � �� G I� A�� -+`�_ • •gyp � �. � - �� tt"' � _>>+ - �rL . „p, ,+.� �� •r ,� Aye � �. '-"�' s� PaY, j z a i s` • f�9''t' ' « �� eiclry • , f '}'` '4A Rr� ) _ `5l Ontbu 401 • r' • aat a �/ }�� f■+1 _I sZQA ° j '' g� 1 a• I L '�`•.�• {�'�!-.-. .�* ° � y �1 •5�� Pte, �°° t. it w. �� rr r` ,♦r ��I Ck ' ,L y'r �• �••� FF`�t�','�! y�° k* f f4a`f '��Kr tat'� e'Feu i4r,h+g� `f� 4 +F 3 45 Snitt 3. � a < r �s 6GF ��v��► �i � f •",� __/".� k �' may+ '�y kY• �d ,C t' L 'a�) ��I 1a iC,.�� J- Imo• /Y� fGy� �♦�7 +{ r ' 1 � : rye ' • '�Y ,j�"'�t a _ • � CJs - cm NC00025534 e City of Hendersonville *fid, i�s)UF2s=onr Sub6 itd-0Jk2 Stra n s f&+ s 0 Dw: WC. W10105 Aperydan St+aenm Mud Geek Pen:==w Flasr, 4 R t 6 C IAGG Fact Sheet NPDES Permit No. NCOO25534 Permit Wnter/Email Contact Gary Perlmutter, gary.perlmutter@ncdenr.gov Date- Month xx, 2017 Division/Branch- NC Division of Water Resources/NPDES Complex Permitting Fact Sheet Template- Version 09Jan2017 Perrnttmg Action: ® Renewal ❑ Renewal with Expansion ❑ New Discharge ❑ Modification (Fact Sheet should be tailored to mod request) Note A complete application should include the following- • For New Dischargers, EPA Form 2A or 21) requirements, Engineering Alternatives Analysis, Fee • For Existing Dischargers (POTW), EPA Form 2A, 3 effluent pollutant scans, 4 2" d species WET tests. • For Existing Dischargers (Non-POTW), EPA Form 2C with correct analytical requirements based on industry category. Complete applicable sections below. If not applicable, enter NA 1. Basic Facility Information Facility Information Applicant/Facility Name: City of Hendersonville WWTP Applicant Address: 305 Williams Street, Hendersonville, NC 28792 Facility Address: 99 Balfour Road Hendersonville, NC 28792 Permitted Flow: Phased 4.8 and 6.0 MGD Facility Type/Waste: MAJOR Municipal; 95% domestic, 5% industrial Facility Class: Class 4 Treatment Units: Bar Screen, Gravity Thickener, Belt Press, Aerated Grit Removal, Activated Sludge, Clanfication, Low Head Filters, UV disinfection, Cascade Aeration Pretreatment Program (Y/1) Yes County: Henderson Region Asheville Briefly describe the proposed permitting action and facility background The City of Hendersonville has applied for NPDES permit renewal, and submitted a renewal application dated June 17, 2015 This facility serves a population of 19,800 residents and operates a pretreatment program with 1 Significant Industrial User (SIU) and 2 Categorical Industrial Users (ClUs) Page 1 of 11 2. Receiving Waterbody Information: Receiving Waterbody Information Outfalls/Receiving Stream(s): Outfall 001 -Mud Creek Stream Segment: 6-55 Stream Classification: C Drainage Area (mi2): 98 Summer 7Q10 (cfs) 34.9 Winter 7Q10 (cfs). 46.8 30Q2 (cfs): 69.5 Average Flow (cfs): 186 IWC (% effluent): 17.6 and 21.1. 303(d) listed/parameter: This segment is listed as impaired for Benthos and Fish Community on the Final 2014 and Draft 2016 303(d) lists. Subject to TMDL/parameter: Statewide TMDL for Mercury Subbasin/HUC: 04-03-02; 0601Q105 Upper French Broad USGS Topo Quad- F9SW/Hendersonville, NC 3. Effluent Data Summary Effluent data is summarized below for the period January 2013 through February 2017. Table. Effluent Data Summary Parameter Units Average Max Min Limit' Flow MGD 3.10 9.99 1.99 4.80 BODS summer mg/L 4.3 17.5 < 2 MA = 10 0 WA= 15 0 BODS winter mg/L 45 15.5 < 2 MA = 20 0 WA = 30.0 BOD removal ° 0 97.3 NA NA > 85 Total Suspended Solids MA = 30.0 (TSS) mg'L 4.2 28 8 < 2.5 WA = 45.0 TSS removal % 98.5 NA NA > 85 NH3N summer mg/L 0.54 6.90 < 0 50 MA = 2 0 WA = 6.0 NH3N winter mg/L 0.55 4.40 < 0.50 MA -40 WA = 12.0 Dissolved Oxygen (DO) mg/L 7.3 9.8 5.0 > 5.0 Page 2 of 11 Fecal Coliform #/100 mL 65 600 < I MA = 200 (geometric mean) WA = 400 Total Residual Chlorine µg/L NA NA' NA' DM = 28 (TRC) Temperature °C 176 25.1 6.0 Monitor only pH SU 68 7.3 59 6-9 Total Nitrogen mg/L 955 19 10 430 Monitor only Total Phosphorus mg/L 270 4.40 1 10 Monitor only Chronic Toxicity Ceraodaphnaa pass pass pass Pass Monitor Bis(2-ethylhexyl)phthalate µg/L < 5 < 5 <5 only Total Copper µg/L 15.8 86.0 7.0 Monitor only Total Zinc µg/L 472 853 004 Monitor only Total Nickel µg/L 113 1070 <5 0 MA = 142 WA = 1268 'MA -Monthly Average, WA -Weekly Average, DM -Daily Maximum 'Facility is using UV for disinfection, not chlorine a 4. Instream Data Summary Instream monitoring may be required in certain situations, for example 1) to verify model predictions when model results for instream DO are within 1 mg/L of instream standard at full permitted flow, 2) to verify model predictions for outfall diffuser; 3) to provide data for future TMDL, 4) based on other instream concerns. Instream monitoring may be conducted by the Permittee, and there are also Monitoring Coalitions established in several basins that conduct instream sampling for the Permittee (in which case mstream monitoring is waived in the permit as long as coalition membership is maintained) If applicable, summarize any instream data and what instream monitoring will be proposed for this permit action The current permit requires instream monitoring for DO, Fecal Coliform and Temperature Review of instream data from February 2014 through February 2017 yielded an average upstream to downstream DO increase of 0 4 mg/L, which tested significant (t-test, p = 0 01), indicating that oxygen - consuming wastes in the effluent are not causing the receiving water DO to decrease Temperature did not significantly change between upstream and downstream (mean difference was 0 2 °C, t-test resulted in p > 0 10), likewise indicating that the effluent is not affecting the receiving water thermally Fecal Coliform values varied greatly, with an average decrease of 6 colonies/100 mL from upstream to downstream Instream fecal coliform counts were often above the effluent standard of 200/100 mL monthly average, both upstream and downstream of the plant with 198 and 121 days, respectively (264 total days examined) Overall, the data suggest that the POTW is not impacting the water quality of Mud Creek sufficiently to require an alteration in instream monitoring Therefore, it is recommended that instream monitoring be continued at the existing frequency Page 3 of 11 Is this facility a member of a Monitoring Coalition with waived instream monitoring (YIN) NO Name ofMonitorzng Coalition NA 5. Compliance Summary Summarize the compliance record with permit effluent limits (past 5 years). The facility reported one limit violation in the past five years. A pH of 5 9 (limit: 6-9) was reported on January 9, 2017. No action was taken Summarize the compliance record with aquatic toxicity test limits and any second species test results (past 5 years): The facility passed 19 of 19 quarterly chrome Ceriodaphnia dubia toxicity tests, as well as all 4 second species (Fathead Minnow) chronic toxicity test; sampled on 11/06/2016, 12/4/2016, 01/03/2017 and 02/12/2017. Summarize the results from the most recent compliance inspection The most recent facility inspection was conducted on February 22, 2017 The inspector reported that the facility appeared to be well maintained and operated, and m compliance with its permit. 6. Water Quality -Based Effluent Limitations (WQBELs) Dilution and Mixing Zones In accordance with 15A NCAC 2B.0206, the following streamflows are used for dilution considerations for development of WQBELs: 1Q10 streamflow (acute Aquatic Life); 7Q10 streamflow (chronic Aquatic Life, non -carcinogen HH), 30Q2 streamflow (aesthetic); annual average flow (carcinogen, HH). If applicable, describe any other dilution factors considered (e g, based on CORMLXmodel results) NA If applicable, describe any mixing zones established in accordance with 15A NCAC 2B 0204(b)' NA Oxygen -Consuming Waste Limitations Limitations for oxygen -consuming waste (e.g., BOD) are generally based on water quality modeling to ensure protection of the instream ,dissolved oxygen (DO) water quality standard Secondary TBEL limits (e g, BOD= 30 mg/L for Municipals) may be appropriate if deemed more stringent based on dilution and model results. Ifpermat limits are more stringent than TBELs, describe how limits were developed Limitations for BOD are based on a Streeter Phelps model (Level B) for mstream DO protection. No changes are proposed from the previous permit limits Ammonia and Total Residual Chlorine Limitations Limitations for ammonia are based on protection of aquatic life utilizing an ammonia chronic criterion of 1.0 mg/L (summer) and 1 8 mg/L (winter). Acute ammonia limits are derived from chronic criteria, utilizing a multiplication factor of 3 for Municipals and a multiplication factor of 5 for Non-Mumcipals Limitations for Total Residual Chlorine (TRC) are based on the NC water quality standard for protection of aquatic life (17 ug/1) and capped at 28 ug/l (acute impacts). Due to analytical issues, all TRC values reported below 50 ug/l are considered compliant with their permit limit. Page 4 of 11 Describe any proposed changes to ammonia and/or TRC limits for this permit renewal The facility does not chlorinate, therefore the current TRC limit and monitoring requirement will be removed from the permit The current NH3-N limits (originally set as oxygen -consuming limits) are more stringent than those calculated using the WLA spreadsheet Reasonable Potential Analysis (RPA) for Toxicants If applicable, conduct RPA analysis and complete information below The need for toxicant limits is based upon a demonstration of reasonable potential to exceed water quality standards, a statistical evaluation that is conducted during every permit renewal utilizing the most recent effluent data for each outfall The RPA is conducted in accordance with 40 CFR 122.44 (d) (i) The NC RPA procedure utilizes the following 1) 95% Confidence Level/95% Probability, 2) assumption of zero background, 3) use of 1/2 detection limit for "less than" values; and 4) streamflows used for dilution consideration based on 15A NCAC 2B 0206 Effective April 6, 2016, NC began implementation of dissolved metals cntena in the RPA process in accordance with guidance titled NPDES Implementation of Instream Dissolved Metals Standards, dated June 10, 2016. A reasonable potential analysis was conducted on effluent toxicant data collected between January 2013 and January 2017. Pollutants of concern included toxicants with positive detections and associated water quality standards/critena. Based on this analysis, the following permitting actions are proposed for this permit • Effluent Limit with Monitoring. The following parameters will receive a water quality -based effluent limit (WQBEL) since they demonstrated a reasonable potential to exceed applicable water quality standards/cntena Copper at 6.0 MGD permitted flow • Monitoring Only The following parameters will receive a monitor -only requirement since they did not demonstrate reasonable potential to exceed applicable water quality standards/cntena, but the maximum predicted concentration was > 50% of the allowable concentration- Copper (at 4.8 MGD only), Nickel and Silver All silver effluent samples were reported as non -detects at < 5 µg/L Since the allowable discharge concentration is < 1 µg/L, monitoring is recommended at a lower detection level of < 1 µg/L. • No Limit or Monitorm : The following parameters will not receive a limit or monitoring, since they did not demonstrate reasonable potential to exceed applicable water quality standards/cntena and the maximum predicted concentration was < 50% of the allowable concentration Arsenic, Beryllium, Cadmium, Total Phenolic Compounds, Total Chromium, Cyanide, Lead, Selenium, Zinc • POTW Effluent Pollutant Scan Review Three effluent pollutant scans were evaluated for additional pollutants of concern o The following parameter(s) will receive a water quality -based effluent limit (WQBEL) with monitoring, since as part of a limited data set, two samples exceeded the allowable discharge concentration None o The following parameter(s) will receive a monitor -only requirement, since as part of a limited data set, one sample exceeded the allowable discharge concentration None If applicable, attach a spreadsheet of the RPA results as well as a copy of the Dissolved Metals Implementation Fact Sheet for fi-eshwater/saltwater to this Fact Sheet Include a printout of the RPA Dissolved to Total Metal Calculator sheet of this is a Municipality with a Pretreatment Program Toxicity Testing Limitations Permit limits and monitoring requirements for Whole Effluent Toxicity (WET) have been established in accordance with Division guidance (per WET Memo, 8/2/1999) Per WET guidance, all'NPDES permits Page 5 of 11 issued to Mayor facilities or any facility discharging "complex" wastewater (contains anything other than domestic waste) will contain appropriate WET limits and monitoring requirements, with several exceptions. The State has received prior EPA approval to use an Alternative WET Test Procedure in NPDES permits, using single concentration screening tests, with multiple dilution follow-up upon a test failure Describe proposed toxicity test requirement Hendersonville WWTP is a Mayor POTW with chronic WET limits of 18% effluent at 4 8 MGD and 21 % at 6 0 MGD upon expansion No changes are proposed. Mercury Statewide TMDL Evaluation There is a statewide TMDL for mercury approved by EPA in 2012 /The TMDL target was to comply with EPA's mercury fish tissue criteria (C 3 mg/kg) for human health protection The TMDL established a wasteload allocation for point sources of 37 kg/year (81 lb/year), aifd is applicable to municipals and industrial facilities with known mercury discharges Given�he small contribution of mercury from point sources (^-2% of total load), the TMDL emphasizes mercury minimization plans (MMPs) for point source control Municipal facilities > 2 MGD and discharging quantifiable levels of mercury (> 1 ng/L) will receive an MMP requirement Industrials are evaluated on a case-by-case basis, depending if mercury is a pollutant of concern Effluent limits may also be added if annual average effluent concentrations exceed the WQBEL value (based on the NC WQS of 12 ng/L) and/or if any individual value exceeds a TBEL value of 47 ng/L Table Mercury Effluent Data Summary Parameter 2012 2013 2014 2015 1 2016 No of Samples 5 4 4 5 3 Annual Average Conc. ng/L 1.6 1 0 6.1 23 2 1 Maximum Conc , ng/L 2:32 1.38 20.50 410 307 TBEL, ng/L 47 WQBEL, ng/L 683 Describe proposed permit actions based on mercury evaluation Since no annual average mercury concentration exceeded, the WQBEL, and no individual mercury sample exceeded the TBEL, no mercury limit is required. However, since the facility is > 2 MGD and reported quantifiable levels of mercury (> 1 ng/L), a Mercury Minimization Plan ((-MMP) has been added to the permit Other TMDL/Nutnent Management Strategy Considerations If applicable, describe any other TMDLs/Nutrient Management Strategies and their implementation within this permit• The French Broad River Basin has no TMDLs, nor does it have a Nutrient Management Strategy. Total Nitrogen and Total Phosphorus is monitored quarterly per facility size (> 1 MGD) and river sub -basin (French Broad) as specified in 15A NCAC 02B 0508 No changes are proposed. Other WQBEL Considerations If applicable, describe any other parameters of concern evaluated for WQBELs The current permit requires quarterly monitoring of Bis{2-ethylhexyl)phthalate, based on detects in prior Effluent Scans All Page 6 of 11 data under the current permit were below detection at 5 µg/L, the Permittee requested this be removed from the permit 'Review of the data revealed that continued monitoring is no longer necessary, quarterly monitoring of Bis(2-ethylhexyl)phthalate is proposed for removal If applicable, describe any special actions (HQW or OR W) this receiving stream and classification shall comply with in order to protect the designated waterbody NA If applicable, describe any compliance schedules proposed for this permit renewal in accordance with 15A NCAC 2H 0107(c)(2)(B), 40CFR 122 47, and EPA May 2007 Memo NA If applicable, describe any water quality standards variances proposed in accordance with NCGS 143- 215 3(e) and 15A NCAC 2B 0226 for this permit renewal NA 7. Technology -Based Effluent Limitations (TBELs) Municipals if not applicable, delete and skip to Industrials) Are concentration limits in the permit at least as stringent as secondary treatment requirements (30 mg/L BODS/TSS for Monthly Average, and 45 mg/L for BODS/TSS for Weekly Average). YES If NO, provide ajustification for alternative limitations (e.g, waste stabilization pond). NA Are 85% removal requirements for BODS/TSS included in the permit? YES If NO, provide alust f cation (e g, waste stabilization pond) NA Industrials (if not applicable, delete and slap to next Section) NA 8. Antidegradation Review (New/Expanding Discharge) The objective of an antidegradation review is to ensure that a new or increased pollutant loading will not degrade water quality Permitting actions for new or expanding discharges require an antidegradation review in accordance with 15A NCAC 2B.0201 Each applicant for a new/expanding NPDES permit must document an effort to consider non -discharge alternatives per 15A NCAC 2H.0105(c)(2) Ina]] cases, existing instream water uses and the level of water quality necessary to protect the existing use is maintained and protected If applicable, describe the results of the antidegradation review, including the Engineering Alternatives Analysis (EAA) and any water quality modeling results NA 9. Antibacksliding Review - Sections 402(0)(2) and 303(d)(4) of the CWA and federal regulations at 40 CFR 122.44(1) prohibit backsliding of effluent limitations in NPDES permits These provisions require effluent limitations an a reissued permit to be as stringent as those in the previous permit, with some exceptions where limitations may be relaxed (e g , based on new information, increases in production may warrant less stringent TBEL limits, or WQBELs may be less stringent based on updated RPA or dilution) Are any effluent limitations less stringent than previous permit (YES/NO) NO Page 7 of 11 If YES, confirm that antibacksliding provisions are not violated • NA 10. Monitoring Requirements Monitoring frequencies for NPDES permitting are established in accordance with the following regulations and guidance 1) State Regulation for Surface Water Monitoring, 15A NCAC 2B.0500, 2) NPDES Guidance, Monitoring Frequency for Toxic Substances (7/15/2010 Memo), 3) NPDES Guidance, Reduced Monitoring Frequencies for Facilities with Superior Compliance (10/22/2012 Memo); 4) Best Professional Judgement (BPJ). Per US EPA (Interim Guidance, 1996), monitoring requirements are not considered effluent limitations under Section 402(0) of the Clean Water Act, and therefore anti - backsliding prohibitions would not be triggered by reductions in monitoring frequencies For mstream monitoring, refer to Section 4 11. Electronic Reporting Requirements The US EPA NPDES Electronic Reporting Rule was finalized on December 21, 2015. Effective December 21, 2016, NPDES regulated facilities are required,to submit Discharge Monitoring Reports (DMRs) electronically Effective December 21, 2020, NPDES regulated facilities will be required to submit additional NPDES reports electronically. This permit contains the requirements for electronic reporting, consistent with Federal requirements 12. Summary of Proposed Permitting Actions Table 1 Current Permit Conditions and Proposed Changes until expansion above 4 8 MGD Parameter Current Permit Proposed Change Basis for Condition/Change Flow MA 4.8 MGD No change 15A NCAC 2B 0505. Summer: MA 10 mg/L WQBEL. Based on protection of BODS WA 15 mg/L No change DO standard 15A NCAC 2B.0200, Winter- assigned upon facility expansion of MA 20 mg/L 4.8 MGD in 2002. WA 30 mg/L Total Suspended Solids MA 30 mg/L TBEL Secondary treatment (TSS) WA 45 mg/L No change standards/40 CFR 133 / 15A NCAC 2B 0406 Summer. MA 2 mg/L WA 6 mg/L WQBEL. 40 CFR 122 45, set as NH3-N Winter: No change modification in permit renewal, MA 4 mg/L April 19, 2006 WA 12 mg/L Dissolved Oxygen (DO) > 5 mg/L No change WQBEL State WQ standard, 15A NCAC 2B.0200. Page 8 of 11 Fecal Coliform MA 200 /100 mL No change WQBEL. State WQ standard, 15A (geometric mean) WA 400 /100 mL NCAC 2B.0200 Total Residual Chlorine DM 28 µg2 Remove from Facility does not chlorinate. (TRC) monitoring Temperature Monitor daily No Change WQBEL. State WQ standard, 15A NCAC 2B .0500 WQBEL. State WQ standard, 15A pH 6-9 SU No change NCAC 2B.0200. Total Nitrogen Monitor No change 15A NCAC 02B.0508. (NO2 + NO3 + TKN) quarterly Total Phosphorus Monitor quarterly No change 15A NCAC 02B.0508. Ceriodaphnia .WQBEL. No toxics in toxic Chronic Toxicity pass/fail at 18% No change amounts. 15A NCAC 2B.0200 and effluent 15A NCAC 2B.0500. Bis(2-ethylhexyl)phthalate Monitor Remove from No detects at 5 µg2 in DMR data quarterly monitoring Hardness -dependent dissolved metals water quality standards, Total Hardness No requirement Monitor quarterly approved in 2016, need effluent and instream hardness data for calculations of permit limitations. No reasonable potential found; Total Copper Monitor quarterly quarterly No change predicted maximum >50% of allowable Cw No reasonable potential found; Total Nickel Monitor quarterly No change predicted maximum >50% of allowable Cw. v Add quarterly No detects at 5 µg/L, higher than Total Silver No requirement monitoring at lower allowable Cw. PQL Monitor Remove from No reasonable potential found, Total Zinc quarterly monitoring predicted maximum < 50% of allowable Cw. WQBEL. In accordance with 2012 Mercury Minimization No requirement Add MMP Special Statewide Mercury TMDL Plan (MMP) Condition Implementation, per facility size and monitoring data criteria. Reduce to three Effluent Pollutant Scan Annual times per permit 40 CFR 122 cycle Add Electronic In accordance with EPA Electronic Electronic Reporting No requirement Reporting Special Reporting Rule 2015. Condition MGD — Million gallons per day, MA - Monthly Average, WA — Weekly Average, DM — Daily Max Page 9 of 11 Table 2. Current Permit Conditions and Proposed Changes upon expansion above 4.8 MGD. Parameter Current Permit Proposed Change Basis for Condition/Change Flow MA 6 0 MGD No change 15A NCAC 2B.0505 Summer. MA 10 mg/L WA 15 mg/L WQBEL. Based on protection of BODS Winter No change DO standard 15A NCAC 2B.0200. MA 20 mg/L WA 30 mg/L Total Suspended Solids MA 30 mg/L TBEL. Secondary treatment (TSS) WA 45 mg/L No change If standards/40 CFR 133 / 15A NCAC 2B .0406 Summer MA 2 mg/L W 6 mg/L WQBEL 40 CFR 122.45, set as NH3-N Winter. No change modification in permit renewal, MA 4 mg/L Apnl 19, 2006 WA 12 mg/L Dissolved Oxygen (DO) > 5 mg/L No change WQBEL State WQ standard, 15A NCAC 2B 0200. Fecal Coliform MA 200 /100 mL No change WQBEL State WQ standard, 15A (geometric mean) WA 400 /100 mL NCAC 2B 0200 Total Residual Chlorine DM 28 µg2 Remove from Facility does not chlorinate. (TRC) momtonng Temperature Monitor daily No Change WQBEL State WQ standard, 15A NCAC 2B.0500 pH 6-9 SU No change WQBEL State WQ standard, 15A NCAC 2B .0200. Total Nitrogen (NO2 + NO3 + TKN) Monitor quarterly No change 15A NCAC 02B 0508 Total Phosphorus Monitor quarterly No change 15A NCAC 02B .0508 Ceriodaphnia WQBEL No toxics in toxic Chronic Toxicity pass/fail at 21 % No change amounts 15A NCAC 2B 0200 and effluent 15A NCAC 2B 0500 Bis(2-ethylhexyl)phthalate Monitor quarterly Remove from No detects at 5 gg/L in DMR data momtonng Hardness -dependent dissolved Total Hardness No requirement Monitor quarterly metals water quality standards, approved in 2016, need effluent and Page 10 of 11 MGD — Million gallons per day, MA - Monthly Average, WA — Weekly Average, DM — Daily Max 13. Fact Sheet Addendum (if applicable): Were there any changes made since the Draft Permit was public noticed (Yes/No) NO If Yes, list changes and their basis below • NA 14. Fact Sheet Attachments (if applicable): • NPDES Aquifer Protection Permitting Unit Pretreatment Information Request Form • Draft 2016 Category 5 Assessments EPA Submittal — 303(d) List, page 44 • Final 2014 NC 303(d) list, page 31 • Instream Monitoring summary tables and charts • Removal Rate Calculations • Monitoring Reports: violations • WET Testing and Self Monitoring Summary, page 53 • Compliance Evaluation report, 2/22/2017 • NH3/TRC WLA Calculations sheet • RPA Spreadsheet Summary for current 4.8 MGD and 6 0 MGD expansion • Dissolved Metals Implementation/Freshwater • Mercury Data Statistics sheet Page 11 of 11 mstream hardness data for calculations of permit limitations. Total Copper Monitor quarterly MA = 37.5 µg/L WA = 42.8 gg/L Reasonable potential found. No reasonable potential found; Total Nickel Monitor quarterly No change predicted maximum > 50% of allowable Cw. Add quarterly No detects at 5hi her than µms' g Total Silver No requirement monitoring at lower allowable Cw. limit Remove from No reasonable potential found; Total Zinc Monitor quarterly predicted maximum < 50% of monitoring allowable Cw WQBEL. In accordance with 2012 Mercury Minimization No requirement Add MMP Special Statewide Mercury TMDL Plan (MMP) Condition Implementation, per facility size and monitoring data criteria. Reduce to three Effluent Pollutant Scan Annual times per permit 40 CFR 122 cycle Add Electronic In accordance with EPA Electronic Electronic Reporting No requirement Reporting Special Reporting Rule 2015. Condition MGD — Million gallons per day, MA - Monthly Average, WA — Weekly Average, DM — Daily Max 13. Fact Sheet Addendum (if applicable): Were there any changes made since the Draft Permit was public noticed (Yes/No) NO If Yes, list changes and their basis below • NA 14. Fact Sheet Attachments (if applicable): • NPDES Aquifer Protection Permitting Unit Pretreatment Information Request Form • Draft 2016 Category 5 Assessments EPA Submittal — 303(d) List, page 44 • Final 2014 NC 303(d) list, page 31 • Instream Monitoring summary tables and charts • Removal Rate Calculations • Monitoring Reports: violations • WET Testing and Self Monitoring Summary, page 53 • Compliance Evaluation report, 2/22/2017 • NH3/TRC WLA Calculations sheet • RPA Spreadsheet Summary for current 4.8 MGD and 6 0 MGD expansion • Dissolved Metals Implementation/Freshwater • Mercury Data Statistics sheet Page 11 of 11