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Home My WebLink AboutNC0021211_Technical Correction_20100809A �& NCDENR North Carolina Department of Environment and Natural Resources Division of Water Quality Beverly Eaves Perdue Coleen H. Sullins Governor Director August 9,' 2010 Mr. Chris Rollins, City Manager City of Graham PO Drawer 357 Graham, North Carolina 27253-0357 Subject: Technical Corrections Permit NCO021211 Graham WWTP Alamance County Dear Mr. Rollins: Dee Freeman Secretary In response to July 21 comments from Victor Quick, Utility Director, please find enclosed the following corrected pages for the City's NPDES permit, issued July 9, 2010: • The requirements for mercury in Condition A.(1.) have been corrected to specify at least "monthly' monitoring. • Monitoring requirements in Condition A.(1.) for lead, which were omitted from the draft and final permits, have been restored in this corrected final permit. • The pollutant scan requirements in the City's previous permit, conditions A.(1.) and A.(6.), were omitted from the draft and final permits and have been restored in this corrected final permit, now in conditions A.(1.) and A.(9.). Please insert the new pages and discard or strike out the corresponding pages in the permit you recently received. Mr. Quick expressed his concern that the second round of changes in the Part IV Standard Conditions still contains requirements from the state's draft pretreatment rules: The Division has removed 1617 Mail Service Center, Raleigh, North Carolina 27699.1617 Location: 512 N. Salisbury St. Raleigh, North Carolina 27604 Phone: 919-807-6 300 1 FAX: 919-807-64921 Customer Service:1-877-623-6748 Internet www.ncwaterquality.org An Equal Opportunity 1 Affirmative Action Employer One Carolina 6oVaNtura!ly Mr. Chris, Rollins, City Manager Technical Corrections August 9, 2010 those requirements except where they are part of the federal pretreatment rules and are already in effect. These corrections do not alter the issuance or effective dates of the permit, which remain at July 9 and August 1, 2010, respectively. If you have any questions concerning this permit, please contact Mike Templeton at (919) 807-6402 or at mike. templetonQncdenr.gov. Sincy, rrenl^y,644 leen H. Sullins Enclosure: Technical corrections, NC0021211 (3 pages) Copies: Victor R. Quick, Utilities Director Scott Pickard, Pretreatment Coordinator Chief, NPDES and Biosolids Permits Section, Region IV, EPA Winston-Salem Regional Office, Surface Water Protection Aquatic Toxicity Unit PERCS Unit NPDES Files Central Files Permit No. NCO021211 A.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below: EFFLUENT LIMITATIONS MONITORING REQUIREMENTS EFFLUENT CHARACTERISTICS Monthly Weekly ;' Daily ..., Measurement "Sample Sample Location Average Average .. , Maximum Frequency ; :Type Flow 3.5 MGD Continuous Recording Influent or Effluent Total Monthly Flow Monitor & Report (MG) Monthly Rec. or Calc. Influent or Effluent BOD, 5 day, 20°C 2 12.0 mg/L 18.0 mg/L Daily Composite Influent and Effluent (April 1 -October 31) BOD, 5 day, 200C 2 (November 1- March 31) 24.0 mg/L 36.0 mg/L Daily Composite Influent and Effluent Total Suspended Solids 2 30.0 mg/L 45.0 mg/L Daily Composite Influent and Effluent NH3 as N (April 1- October 31) 4.0 mg/L 12.0 mg/L Daily Composite Effluent NH3 as N (November 1- March 31) 8.0 mg/L 24.0 mg/L Daily Composite Effluent Dissolved Oxygen 3 Daily Grab Effluent, 1 Upstream & Downstream pH 4 Daily Grab Effluent Temperature Daily Grab Effluent, 1 Upstream & Downstream Fecal Coliform 200 / 100 400/100 mL Daily Grab Effluent (geometric mean) mL Total Residual Chlorine 5 28 ug/L Daily Grab Effluent Conductivity Daily Grab Effluent TKN Monitor & Report (mg/L) Weekly Composite Effluent NO3-N + NO2-N Monitor & Report (mg/L) Weekly Composite Effluent Total Nitrogen, TN Monitor & Report (mg/L) Weekly Composite Effluent TN Load 6 Monitor & Report (lb/mo) Monthly Calculated Effluent Monitor & Report (lb/yr) Annually Total Phosphorus, TP' Monitor & Report (mg/L) Weekly Composite Effluent TP load 6 Monitor & Report (!b/mo) Monthly Calculated Effluent 7,079 ib/yr (effective 1/1/2010) Annually Total Lead Monthly Composite Effluent Total Mercury Monthly Grab Effluent Total Copper Monthly Composite Effluent Total Zinc Monthly Composite Effluent Chronic Toxicity a Quarterlyc Composite Effluent Effluent Pollutant Scan 9 Annually Grab/ Composite Effluent All footnotes are listed on the following page. Permit No. NCO021211 Footnotes: 1. Upstream = at Highway 54. Downstream = at NCSR 2158. Stream samples shall be grab samples collected three times per week during June, July, August and September and once per week during the remaining months of the year. See section A .(2) for details regarding the provisional waiver of instream monitoring requirements. 2. The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the respective influent value (85% removal). 3. The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/L. 4. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units. 5. Effluent monitoring and limitation only apply if chlorine or a chlorine derivative is added to the waste stream during treatment. 6. TN or TP Load is the mass quantity of Total Nitrogen or Phosphorus discharged in a given period of time. See Special Condition A.(6.), Calculation of Mass Loads 7. Compliance with mass limits shall be determined in accordance with Special Condition A.(5.), Annual Limits for Total Nitrogen or Total Phosphorus. 8. Chronic Toxicity (Ceriodaphnia) P/F limit at 14% with besting in March, June, September and December. See Special Condition A. (3.). 9. See Condition A.(9.), Effluent Pollutant Scan. There shall be no discharge of floating solids or visible foam in other than trace amounts. A.(2.) PROVISIONAL WAIVER OF INSTREAM MONITORING REQUIREMENTS Instream monitoring requirements in this NPDES permit shall be provisionally waived so long as the Permittee remains a member of the Upper Cape Fear River Basin Association and the Association continues to function as approved by the Division and Environmental Management Commission. If the Permittee does not participate in the Association or if the Association ceases to function, the instream monitoring requirements in this permit become effective immediately; and the Division may reopen this permit by administrative letter to establish additional instream monitoring requirements it deems necessary to adequately characterize the effects of the discharges on water quality in the receiving stream. Permit No. NC0021211 A.(9.) EFFLUENT POLLUTANT SCAN The Permittee shall perform an annual Effluent Pollutant Scan for all parameters listed in the table below (in accordance with 40 CFR Part 136). The annual effluent pollutant scan samples shall represent seasonal (summer, winter, fall, spring) variations over the 5-year permit cycle. Unless otherwise indicated, metals shall be analyzed as "total recoverable."Additionally, the method detection level and the minimum level shall be the most sensitive as provided by the appropriate analytical procedure. Ammonia (as N) Trans-1,2-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/Nitrite 1,3-dichloropropylene 4-bromophenyl phenyl ether Kjeldahl nitrogen Ethylbenzene Butyl benzyl phthalate Oil and grease Methyl bromide 2-chloronaphthaIene Phosphorus Methyl chloride 4-chlorophenyl phenyl ether Total dissolved solids Methylene chloride Chrysene Hardness 1,1,2,2-tetrachloroethane Di-n-butyl phthalate Antimony Tetrachloroethylene Di-n-octyl phthalate Arsenic Toluene Dibenzo(a,h)anthracene Beryllium 1,1,1-trichloroethane 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* P-chloro-m-cresol Dimethyl phthalate Nickel 2-chlorophenol 2,4-dinitrotoluene Selenium 2,4-dichlorophenol 2,6-dinitrotoluene Silver 2,4-dimethylphenol 1,2-diphenylhydrazine Thallium 4,6-dinitro-o-cresol Fluoranthene Zinc 2,4-dinitrophenol Fluorene Cyanide 2-nitrophenol Hexachlorobenzene Total phenolic compounds 4-nitrophenol Hexachlorobutadiene Volatile organic compounds: Pentachlorophenol Hexachlorocyclo-pentadiene Acrolein 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-nitrosodi-n-propylamine Chlorodibromomethane Benzidine N-nitrosodimethylamine Chloroethane Benzo(a)anthracene N-nitrosodiphenylamine 2-chloroethylvinyl ether Benzo(a)pyrene Phenanthrene Chloroform 3,4 benzofluoranthene Pyrene Dichlorobromomethane Benzo(ghi)perylene 1,2,4-trichlorobenzene 1,1-dichloroethane Benzo(k)fluoranthene 1,2-dichloroethane Bis (2-chloroethoxy) methane Test results shall be reported to the Division in DWQ Form DMR-PPA1 or in a form approved by the Director within 90 days of sampling. The report shall be submitted to the following address: NC DENR/ DWQ/ Central Files 1617 Mail Service Center Raleigh, North Carolina 27699-1617. *Mercury samples shall be analyzed using EPA Method 1631E.