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HomeMy WebLinkAboutNC0025011_Draft Permit_20171003WaterResources ENVIRONMENTAL QUALITY October 3, 2017 Mr. Joseph R. Pearce P.E., Public Utilities Director City of Elizabeth City P.O. Box 347 Elizabeth City, North Carolina, 27907 Dear Mr. Pearce: ROY COOPER Governor MICHAEL S. REGAN Secretary S. JAY ZIMMERMAN Director Subject: Draft NPDES Major Modification Permit No. NCO025011 Elizabeth City WWTP Pasquotank County Facility Class IV Enclosed with this letter is a copy of the Draft Major Modification for your facility. Please review the draft very carefully to ensure thorough understanding of the conditions and requirements it contains. The Draft Major Modification contains the following significant changes from your current permit: The summer instream monitoring frequency has been reduced and modified to be consistent with the winter instream monitoring frequency. Please submit any comments to me no later than thirty days following your receipt of the draft. At this time, the Division is also publishing a notice in the newspapers of general circulation in Pasquotank 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 Major Modification. If you have any questions about the NPDES permit process, please contact me at the following e-mail address: sergei.chernikov(i4ncdenr gov, or telephone number: 919-807-6386. Respectfully, Sergei Chernikov, Ph.D. Environmental Engineer II Complex NPDES Permitting Unit cc: Central Files NPDES Files EPA Region IV Washinhgton Regional Office / Water Quality (e -copy) WSS/Aquatic Toxicology Unit (e -copy) TACU (e -copy) Nothing Compares_ State of North Carolina I Environmental Quality I Water Resources 512 N Salisbury Street 11611 Mall Service Center I Raleigh, NC 27699-1611 919 707 9000 Permit NC0025011 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY DIVISION OF WATER RESOURCES Draft PERMIT TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (hTDES) In compliance with the provisions 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, Elizabeth City is hereby authorized to discharge wastewater from a facility located at the Elizabeth City WWTP 450 Kobbs Creek Drive, Elizabeth City Pasquotank County to receiving waters designated as the Pasquotank River in the Pasquotank River Basin in accordance with effluent limitations, monitoring requirements, and other applicable 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 December 31, 2017. Signed this day S. Jay Zimmerman P.G., Director Division of Water Resources By Authority of the Environmental Management Commission Page 1 of 7 Permit NC0025011 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. Elizabeth City is hereby authorized to: 1. continue to operate an existing 4.5 MGD wastewater treatment facility utilizing: ➢ Mechanical bar screen ➢ Manually -cleaned bypass bar screen ➢ Aerated grit removal ➢ Parshall flume ➢ Aeration basin with nutrient removal ➢ Pump station with sludge return ➢ Clarifier splitter box ➢ Chlorine contact tank ➢ Sulfur dioxide injection with mixer for effluent dechlorination ➢ Effluent weir box with ultrasonic flow meter ➢ Re -aeration tank with floating aerator ➢ One 30 -inch discharge pipe plumbed to two each 24 -inch outfall lines with diffusers ➢ Sludge storage tanks located at Elizabeth City WWTP, 450 Kobbs Creek Drive, Elizabeth City in Pasquotank County, and 2. discharge from said facility, at a specified location (see attached map), into the Pasquotank River, a Class SC waterbody within the Pasquotank River Basin. Page 2 of 7 Permit NCO025011 Part I A. (I.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS During the period beginning on the effective date of the permit and lasting until permit expiration, the Permittee is authorized to discharge from Outfall 001 Such discharges shall be limited and monitored by the Permittee as specified below. EFFLUENT LIMITS MONITORING REQUIREMENTS CHARACTERISTICS Monthly Weekly Daily Measurement Sample Sample Average Average Maximum Frequency Type Location I Flow 4 5 MGD Continuous Recording Influent or Effluent CBOD, 5 day (20°C) 2 12.0 mg/L 18.0 mg/L Daily Composite Influent & (Apel 1 — Oct 31) Effluent CBOD, 5 day (20°C) 2 Daily Influent & (Nov 1 — March 31) 25 0 mg/L 37.5 mg/L Composite Effluent Total Daily Influent & Suspended Solids 2 30 0 /L mg 45 0 mg/L Composite Effluent s1N 4 0 mg/L 12 0 mg/L Daily Composite Effluent (April October 31) NI -13 as NMarch 8.0 mg/L 24 0 mg/L Daily Composite Effluent (Nov 1 31) Enterococci 35 / 100 mL 276 / 100 mL Daily Grab Effluent, Instream (geometric mean) Dissolved Oxygen 3 Daily Grab Effluent, Instream Total Residual 13 4 µS/I Daily Grab Effluent Chlorine (TRC) 4 Temperature (°C) Daily Grab Effluent, Instream Conductivity Daily Grab Effluent, Instream pH Between 6 8 and 8 5 standard units Daily Grab Effluent, Instream Total Nitrogen 1/Month Composite Effluent, Instream (NO2+NO3+TKN) Total Phosphorus 1/Month Composite Effluent, Instream Total Copper 1/Quarter Composite Effluent Total Zinc l/Quarter Composite Effluent Chronic Toxicity 5 1/Quarter Composite Effluent Total Cyamde6 1/Quarter Grab Effluent Footnotes 1 For mstream sampling locations and monitoring frequencies, See A. (2.). 2 The monthly average effluent CBOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (i e , 85% removal is required) 3 The daily average Dissolved Oxygen effluent concentration shall not fall below 5 0 mg/L 4 TRC -- because low-level TRC is currently difficult to quantify in a wastewater matrix, the Division shall consider all effluent TRC values reported below 50 µg2 to be "in compliance" with the permit. However, the Pernuttee shall continue to record and submit all values reported using North Carolma-certified field and lab test methods, even if these values fall below 50 µg/L 5 Chronic Toxicity (Myszdopsis bahia) limited at 10%, March, June, September and December [see A. (3.)]. 6 Cyanide — The Division shall consider all cyanide values reported below 10 µg/L to be "zero' for compliance purposes However, Discharge Monitoring Reports (DMRs) shall record all values reported by a North Carolina - certified laboratory (even if these values fall below 10 µg/L) The Permittee shall discharge no floating solids or foam visible in other than trace amounts Page 3 of 7 Permit NCO025011 A. (2.) INSTREAM MONITORING REQUIREMENTS Samples shall be collected monthly at two sampling points: Upstream of the outfall at Norfolk 7 Southern Railroad bridge Downstream of the outfall at the U.S. Highway 158 bridge These samples shall be collected as grab samples from approximately 6" below the river surface and test for the following parameters: • Temperature • Dissolved Oxygen • Conductivity • Salinity • Total Nitrogen • Total Phosphorus • Chlorophyll -a • Enterococci • pH A. (3.) CHRONIC TOXICITY PERMIT Quarterly The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Mysidopsis bahia at an effluent concentration of 10%. The permit holder shall perform at a minimum, quarterly monitoring using procedures described below to establish compliance with the permit condition. 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 EPA Method 1007.0, Mysid, Mysidopsis bahia, Survival, Growth, and Fecundity Test, as described in Short -Term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Marine and Estuarine Organisms, Second Edition, EPA/600-4-91/003, July 1994. The test procedure will be based on EPA Method 1007.0, Mysid, Mysidopsis bahia, Survival, Growth, and Fecundity Test, as described in Short -Term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Marine and Estuarine Organisms, Second Edition, EPA -600-4-91-003, July 1994. The procedure will be performed as written with the following exceptions: • The test treatments will consist of a control and a 10% effluent concentration ("pass/fail,"), or a control and five effluent concentrations ranging from of 2.5%, to 30%). • The test will be performed at 20 ppt salinity. • Mortality for pass/fail tests will be evaluated using the t test described on page 91 in Methods for Measuring the Acute Toxicity of Effluents to Freshwater and Marine Organisms, Fourth Edition. EPA/600/4-90/027, September 1991, applying an alpha level of 0.05. Page 4 of 7 Permit NCO025011 The growth endpoint for pass/fail tests will be determined using Appendix G of Short -Term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Marine and Estuarine Organisms, Second Edition, EPA/600-4-91/003, July 1994, applying an alpha level of 0.01. • Mortality and growth endpoints for multiple -concentration tests will be determined using hypothesis testing as described in EPA Method 1007.0, Mysid, Mysidopsis bahia, Survival, Growth, and Fecundity Test, as described in Short -Term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Marine and Estuarine Organisms, Second Edition, EPA/600-4-91/003, July 1994. 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. For pass/fail results, report using the parameter code TGP3E and the DWR Form AT -4 (original) is to be sent to the address below. Additionally, for reporting Chronic Value results use the parameter code THP3E and DWR Form AT -6 (original) is to be sent to the following address: Attention. North Carolina Division of Water Resources 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 Resources indicate potential impacts to the receiving stream, this permit may be re -opened and modified to include alternate monitoring requirements or limits. If the Permittee monitors any pollutant more frequently then required by this permit, the results of such monitoring shall be included in the calculation & reporting of the data submitted on the DMR & all AT Form submitted. NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism survival, 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 5 of 7 Permit NCO025011 A. (4.) PRIORITY POLLUTANT ANALYSIS 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." Ammoma (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 Acrylonitnle Benzene Bromoform Carbon tetrachloride Chlorobenzene Chlorodibromomethane Chloroethane 2-chloroethylvinyl ether Chloroform Dichlorobromomethane 1, 1 -dichloroethane 1,2-dichloroethane Trans-l,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-tnchloroethane 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-duutrophenol 2-mtrophenol 4-nitrophenol Pentachlorophenol Phenol 2,4,6-tnchlorophenol Base -neutral compounds: Acenaphthene Acenaphthylene Anthracene Benzidine Benzo(a)anthracene Benzo(a)pyrene 3,4 benzofluoranthene Benzo(ghi)perylene Benzo(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-dimtrotoluene 2,6-dimtrotoluene 1,2-diphenylhydrazine Fluoranthene Fluorene Hexachlorobenzene Hexachlorobutadiene Hexachlorocyclo-pentadiene Hexachloroethane Indeno (1, 2, 3 -c d) pyrene Isophorone Naphthalene Nitrobenzene N-nitrosodi-n-propylamine N-nitrosodnnethylamme N-nitrosodiphenylamine Phenanthrene Pyrene 1,2,4-tnchlorobenzene 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 DWR Form -A MR-PPA1 or in a form approved by the Director by December 31 st of each designated 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. Page 6 of 7 Permit NC0025011 A. (5.) MERCURY MINIMIZATION PLAN (MMP) The permittee shall develop and implement a mercury minimization plan 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 (httv://Portal.ncdenr.org/web/wq/swp/`ps/npdes, under Model Mercury Minimization Plan). The MMP should place emphasis on identification of mercury contributors and goals for reduction. Results shall be summarized and submitted with the next permit renewal. Page 7 of 7 Elizabeth City WWTP Receivine Stream: Pasquotank River Stream Class: SC Drainage Basin: Pasquotank River Basin Sub -Basin: 03-01-50 Latitude: 360 18'29" N Longitude: 76° 12' 21" W State Grid/Quad: B 34 SW / Elizabeth City, NC Facility Location f not to scale North NPDES Permit NCO25011 =�` Pasquotank County