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HomeMy WebLinkAboutNC0043176_NPDES Permit_20120425A7A. NCDENR North Carolina Department of Environment and Natural Resources Division of Water Quality Beverly Eaves Perdue Charles Wakild, P. E. Dee Freeman Governor Director Secretary April 25, 2012 Mr. Dean Gaster, Utilities Director City of Dunn P.O. Box 1065 Dunn, North Carolina, 28335 Subject: NPDES Draft Permit Permit No. NC0043176 Dunn WWTP Harnett County Facility Class IV Dear Mr. Gaster: 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 following significant changes from your current permit: • A quarterly monitoring for total mercury was added to the permit based on the results of the statistical analyses of the effluent data. In addition, the Mercury TMDL reopener condition was added to the permit to notify you about upcoming TMDL implementation. • The description of the treatment system was updated. Please submit any comments to me no later than thirty days following your receipt of the draft. Comments should be sent to the address listed at the bottom of this page. If no adverse comments are received from the public or from you, this permit will likely be issued in late August, with an effective date of October 1, 2012. If you have any questions about the NPDES permit process, please contact me at the following e- mail address: sergei.chernikov(�ncdenr.gov, or telephone number: 919-807-6393. 1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Location: 512 N. Salisbury St Raleigh, North Carolina 27604 Phone: 919-807-63001 FAX: 919-807-6492 Internet: www.ncwateraualitv.orq An Equal Opportunity \ Affirmative Action Employer Respectfully, Sergei Chernikov, Ph.D. Environmental Engineer II Complex NPDES Permitting Unit NoithCarolina Naturally cc: NPDES Unit (draft permit, fact sheet, RPA) EPA Region 4 (draft permit, fact sheet, RPA, permit application) PERCS Unit (e-copy) Fayetteville Regional Office / Surface Water Protection Section (e-copy) Fayetteville Regional Office / DWR/Public Water Supply Regional Engineer (e-copy) Aquatic Toxicology Unit (e-copy) TACU (e-copy) ESS/Basin Coalition Coordinator (e-copy Carrie Ruhltnan and Steve Kroeger) Permit NC0043176 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY 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, the City of Dunn is hereby authorized to discharge wastewater from a facility located at the Black River WWTP Susan Tart Road Harnett County to receiving waters designated as the Cape Fear River in the Cape Fear 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 This permit and authorization to discharge shall expire at midnight on September 30, 2016. Signed this day. Charles Wakild, P.E. Director Division of Water Quality By Authority of the Environmental Management Commission Permit NC004317,6 SUPPLEMENT TO PERMIT COVER SHEET All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked, and as of this 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 Dunn is hereby authorized to: 1. Continue to operate a 3.75 MGD wastewater treatment facility located at the Black River WWTP on Susan Tart Road near Dunn in Harnett County. The facility includes the following treatment components: • Influent pumps • Equalization tank (3,000,000 gallons) • Automatic bar screen • Aerated grit removal • Influent flow measurement • Aeration basins- 4 cells • Three final clarifiers • Chlorination (12% sodium hypochlorite liquid) • Dechlorination (sodium bisulfate liquid) • Dual chlorine contact tanks • Effluent pumps • Effluent flow meter • Cascade discharge • Sludge handling including Rotary Drum Thickener, aerobic sludge digester, aerated sludge holding tank, and sludge drying beds (optional use) 2. Discharge from said treatment works at the location specified on the attached map into the Cape Fear River, classified WS-V waters in the Cape Fear River Basin. Permit NC0043176 A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS During theperiod beginning on the effective date of the permit 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: DISCHARGE LIMITATONS MONITORING REQUIREMENTS EFFLUENT CHARACTERISTICS Monthly Average Weekly Average Daily Maximum Measurement Frequency Sample Type Sample Location1 Flow 3.75 MGD Continuous Recording Influent or Effluent BOD, 5-day, 20°C 2 (April l — October 31) 12.0 mg/L 18.0 mg/L Daily Composite Influent and Effluent BOD, 5-day, 20°C 2 (November 1— March 31) 24.0 mg/L 36.0 mg/L Daily Composite Influent and Effluent Total Suspended Solids2 30.0 mg/L 45.0 mg/L Daily Composite . Influent and Effluent NH3 as N (April 1— October 31) 2.0 mg/L 6.0 mg/L Daily Composite Effluent NH3 as N (November 1 — March 31). 4.0 mg/L 12.0 mg/L Daily Composite Effluent Dissolved Oxygen3 Daily Grab Effluent Fecal Coliform (geometric mean) 200/100mL 400/100mL Daily Grab Effluent Total Residual Chlorines 28 p g/L Daily Grab Effluent Temperature Daily Grab Effluent Total Phosphorus Monthly Composite Effluent TKN (mg/L) Monitor and report Monthly Composite Effluent NO3-N + NO2-N (mg/L) Monitor and report Monthly Composite Effluent Total Nitrogen4 Monthly Composite Effluent Chronic Toxicity5 Quarterly Composite Effluent pH6 Daily Grab Effluent Temperatures See note 7 Grab Upstream & Downstream Dissolved Oxygen? See note 7 Grab Upstream & Downstream Total Mercury8 Quarterly Grab Effluent NOTES: 1. Upstream = at NC Highway 217. Downstream = approximately 1400 feet below discharge. 2. The monthly average effluent BOD and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal). 3. The daily average dissolved oxygen concentration as measured in the effluent shall not be less than 5.0 mg/L. 4. TN = TKN + NO3-N + NO2-N, where TN is Total Nitrogen, TKN is Total Kjeldahl Nitrogen, and NO3- N and NO2-N are Nitrate and Nitrite Nitrogen, respectively. 5. Chronic Toxicity (Ceriodaphnia) limit at 1% with testing in March, June, September, and December (see Special Condition A. (2)). 6. The pH shall not be less' than 6.0 standard units nor greater than 9.0 standard units. 7. Instream monitoring shall be waived as long as the permittee maintains membership in the Middle Cape Fear River Basin Association (MCFRBA), which conducts comprehensive instream monitoring. If the permittee Permit NC00431"6 cancels membership in the MCFRBA, the facility shall begin collecting the listed instream samples immediately at a frequency of 3/week (June -September) and weekly (October -May). 8. Facility shall employ method 1631E for mercury analysis. 9. Monitoring requirement applies only if chlorine is added for disinfection. 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 µg/L. There shall be no discharge of floating solids or visible foam in other than trace amounts. Permit NC0043176 A. (2) CHRONIC TOXICITY PERMIT LIMIT (Quarterly) — OUTFALL 001 The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia dubia at an effluent concentration of 1.0%. The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent versions or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. The tests will be performed during the months of March, June, September and December. Effluent sampling for this testing 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 -February 1998) or subsequent versions. The chronic value for multiple concentration tests will be determined using the geometric mean of the highest concentration having no detectable impairment of reproduction or survival and the lowest concentration that does have a detectable impairment of reproduction or survival. The definition of "detectable impairment," collection methods, exposure regimes, and further statistical methods are specified in the "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) 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, DWQ Form AT-3 (original) is to be sent to the following address: Attention: NC DENR / DWQ / Environmental Sciences Section 1621 Mail Service Center Raleigh, North Carolina 27699-1621 Completed Aquatic Toxicity Test Forms shall be filed with the Environmental 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 Environmental 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. Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water Quality 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. Permit NC00431 6 A. (3) EFFLUENT POLLUTANT SCAN The Permittee shall perform a total of three (3) Effluent Pollutant Scans for all parameters listed below. The 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. Sampling dates shall represent seasonal variation. Unless otherwise indicated, metals shall be analyzed as "total recoverable." Ammonia (as N) Chlorine (total residual, TRC) Dissolved oxygen Nitrate/Nitrite Kjeldahl nitrogen Oil and grease Phosphorus Total dissolved solids Hardness Antimony .Arsenic Beryllium Cadmium Chromium Copper Lead Mercury (EPA Method 1631E) Nickel Selenium Silver Thallium Zinc Cyanide Total phenolic compounds Volatile organic compounds: Acrolein Acrylonitrile Benzene Bromoform Carbon tetrachloride Chlorobenzene Chloro dibromometh an e Chloroethane 2-chloroethylvinyl ether Chloroform Dichlorobromomethane 1,1-dichloroethane 1,2-dichloroethane Trans-1,2-dichloroethylene 1,1-dichloroethylene 1,2-dichloropropane 1,3-dichloropropylene Ethylbenzene Methyl bromide. Methyl chloride Methylene chloride 1,1,2,2-tetrachloroethane Tetrachloroethylene Toluene 1,1,1-trichloroethane 1,1,2-trichloroethane Trichloroethylene Vinyl chloride Acid -extractable compounds: P-chloro-m-cresol 2-chlorophenol 2,4-dichlorophenol 2,4-dimethylphenol 4,6-dinitro-o-cresol 2,4-dinitrophenol 2-nitrophenol 4-nitrophenol Pentachlorophenol Phenol 2,4,6-trichlorophenol Base -neutral compounds: Acenaphthene Acenaphthylene Anthracene Benzidine Benzo(a)anthracene Benzo(a)pyrene 3,4 benzofluoranthene Benzo(ghi)perylene B enzo(k) fluoranthene Bis (2-chloroethoxy) methane Bis (2-chloroethyl) ether Bis (2-chloroisopropyl) ether Bis (2-ethylhexyl) phthalate 4-bromophenyl phenyl ether Butyl benzyl phthalate 2-chloronaphthalene 4-chlorophenyl phenyl ether Chrysene Di-n-butyl phthalate Di-n-octyl phthalate Dibenzo (a,h) anthracene 1,2-dichlorobenzene 1,3-dichlorobenzene 1,4-dichlorobenzene 3,3-dichlorobenzidine Diethyl phthalate Dimethyl phthalate 2,4-dinitrotoluene 2,6-dinitrotoluene 1,2-diphenylhydrazine Fluoranthene Fluorene Hexachlorobenzene Hexachlorobutadiene H exa chloro cyclo-p entadiene Hexachloroethane Indeno (1,2,3-cd) pyrene Is ophorone Naphthalene Nitrobenzene N-nitrosodi-n-propylamine N-ni tro s o dim e thylamin e N -ni tro s o dip h enylamin e Phenanthrene Pyrene 1,2,4-trichlorobenzene Reporting. The effluent pollutant scan shall be performed once/year during 2013, 2014, and 2015, and test results shall be reported to the Division on DWQ Form -A MR-PPA1 or in a form approved by the Director by December 31sL of each designated sampling year. The report shall be submitted to the following address: NC DENR / DWQ / Central Files, 1617 Mail Service Center, Raleigh, North Carolina 27699-1617. Permit NC0043176 A. (4) PERMIT RE -OPENER: MERCURY TMDL IMPLEMENTATION The Division may re -open the permit to implement the requirements of the Mercury TMDL.