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Home My WebLink AboutNC0079057_Technical Correction_20240213DocuSign Envelope ID: 28E997BF-09A5-439B-8708-04C33CE029A7 ROY COOPER Governor ELIZABETH S. BISER Secretary RICHARD E. ROGERS, JR. Director Joshua O'Brien, Director Town of Manteo PO Box 246 Manteo, NC 27954-0246 Dear Mr. O'Brien: NORTH CAROLINA Environmental Quality February 13, 2024 Subject: NPDES Permit Technical Correction Permit NCO079057 Manteo WWTP Dare County Grade III Biological WPCS SIC Code 4952 The Division issued a final permit to your facility on February 7, 2024. In response to comments to the permit by the Town on February 12, 2023, monitoring frequencies for nutrient parameters Total Nitrogen, TKN, NO2+NO3 and Total Phosphorus have been corrected from monthly to quarterly on both the 0.6 and 1.0 MGD flow tier sheets [Sections A.(1.) and A.(2.)] per 15A NCAC 02B .0500 and consistent with previous permits as well as the current fact sheet. In addition, pH and Dissolved Oxygen (DO) have been corrected from daily to 3/week on the 1.0 MGD flow tier sheet [Section A.(2.)] per 15A NCAC 02B .0500 and consistent with previous permits as well as the fact sheet. Accordingly, we hereby forward the corrected permit pages (Pages 3 and 5 of 14). Please insert the changed pages into your permit. All other terms and conditions in the original permit remain unchanged and in full effect as of May 1, 2023. This is a minor technical correction. Please note that this permit is not transferable except after notice to the Division. The Division may require modification or revocation and reissuance of the permit. This permit does not affect the legal requirements to obtain other permits which may be required by the Division of Water Resources or any other Federal, State, or Local governmental regulations. If you have any questions concerning this permit, please contact Gary Perlmutter at (919) 707-3611 or via email at gary.perlmutter@ncdenr.gov. Sincerely, E:AD•o'c'u.Siwgneld by* A `,• h'w.'' ` `C4645314316 44FE... Michael J. Montebello, NPDES Permitting Branch Chief Division of Water Resources, NCDEQ Hardcopy: NPDES Files eCopy: US EPA Region 4 DWR / Washington Regional Office / Water Quality / David May D E Q North Carolina Department of Environmental Quality I Division of Water Resources 512 North Salisbury Street 1 1611 Mail Service Center I Raleigh, North Carolina 27699-1611 o PanmemA i Envi omen u� /� 919.707.9000 DocuSign Envelope ID: 28E997BF-09A5-439B-8708-04C33CE029A7 NCO079057 PART A.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [0.6 MGD] [15A NCAC 02B .0400 et seq., 15A NCACO2B .0500 et seq.] Grade III Biological Water Pollution Control System [15A NCAC 08G .0302] (a.) During the period beginning on the effective date of the permit and lasting until expansion to 1.0 MGD or permit expiration, whichever is sooner, the Permittee is authorized to discharge treated municipal wastewater from Outfall 001. Such discharges shall be limited and monitored 1 by the Permittee as specified below: PARAMETER Parameter Code EFFLUENT LIMITS MONITORING REQUIREMENTS Monthly Average Weekly I Average Daily Maximum Measurement Frequency Sample Type Sample Location Flow 50050 0.6 MGD Continuous RecordingInfluent or Effluent BOD, 5-day, 20°C2 (Apr 1 - Oct 31) C0310 5.0 mg/L 7.5 mg/L 2/week' Composite Influent & Effluent BOD, 5-day, 20°C 2 (Nov 1 - Mar 31) C0310 10.0 mg/L 15.0 mg/L 2/week' Composite Influent & Effluent Total Suspended Solids (TSS) Z C0530 30.0 mg/L 45.0 mg/L 2/week' Composite Influent & Effluent Ammonia (N13-N) (Apr 1 - Oct 31) C0610 1.4 mg/L 3.4 mg/L Weekly Composite Effluent Ammonia (N13-N) (Nov 1 - Mar 31) C0610 2.5 mg/L 6.2 mg/L Weekly Composite Effluent Enterococci (geometric mean) 61211 351100 mL 276/100 mL 2/week3 Grab Effluent Fecal Coliform 31616 Monitor and Report Weekly Grab Effluent Dissolved Oxygen (DO) 00300 Daily Average > 6.0 mg/L 3/week Grab Effluent pH 00400 Between 6.8 and 8.5 Standard Units 3/week Grab Effluent Temperature (°C) 00010 Monitor and Report Daily Grab Effluent Total Residual Chlorine (TRC) a 50060 1 1 13 µg/L 3/week Grab Effluent Total Nitrogen' (mg/L) C0600 Monitor and Report Quarterly Calculated Effluent TKN (mg/L) 00625 Monitor and Report Quarterly Composite Effluent NO3-N + NO2-N (mg/L) 00630 Monitor and Report Quarterly Composite Effluent Total Phosphorus (mg/L) C0665 Monitor and Report Quarterly Composite Effluent Total Copper interim limit 6,7 01042 3.7 µg/L 5.8 µg/L Monthly Composite Effluent Total Copper final limit 6,7 01042 1.8 µg/L 2.9 µg/L Monthly Composite Effluent Total Nickel 6 (µg/L) 01067 Monitor and Report Quarterly Composite Effluent Total Zinc interim 6,7 01042 Monitor and Report Monthly Composite Effluent Total Zinc final limit 6, 7 01042 42.8 µg/L 47.6 µg/L Monthly Composite Effluent Dibrom limit omethane 32105 interim limit 21.0 µg/L 21.0 µg/L Monthly Composite Effluent Di al limit 32105 final limit 10.5 µg/L 10.5 µg/L Monthly Composite Effluent Bromodichloromethane 32101 (=Dichlorobromomethane) Monitor and Report Monthly Composite Effluent Bis (2-ethylhexyl) phthalate interim 6,7 39100 Monitor and Report p Monthly y Composite p Effluent Bis 6h? xyl) phthalate finall limit 39100 limit 0.2 µg/L 0.2 µg/L Monthly Composite Effluent Total Mercury' (ng/L) COMER Monitor and Report 1/five years Grab Effluent PFAS various Monitor and Report 2/year9 Grab Effluent Acute Toxicity 10 TGE6C Monitor and Report Quarterly Composite Effluent Footnotes on next page. Do'c'IulSiigned by: lVt�l(,IA.G�t,t, YVWVN�"C�1.1.1J L6gAF_ Page 3 of 14 Michael Montebello, NPDES Branch Chief Date: February 13, 2024 DocuSign Envelope ID: 28E997BF-09A5-439B-8708-04C33CE029A7 NCO079057 A.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [1.0 MGD] [15A NCAC 02B .0400 et seq., 15A NCACO2B .0500 et seq.] Grade III Biological Water Pollution Control System [15A NCAC 08G .0302] (a.) During the period beginning upon expansion to 1.0 MGD and lasting until permit expiration, the Permittee is authorized to discharge treated municipal wastewater from Outfall 001. Such discharges shall be limited and monitored 1 by the Permittee as specified below: PARAMETER Parameter Code EFFLUENT LIMITS MONITORING REQUIREMENTS Monthly Average Weekly Average Daily Maximum Measurement Frequency Sample Type Sample Location Flow 50050 1.0 MGD Continuous Recording Influent or Effluent BOD, 5-day, 20°C2 (Apr 1 - Oct 31) C0310 5.0 mg/L 7.5 mg/L 3/week3 Composite Influent & Effluent BOD, 5-day, 20°C2 (Nov 1 - Mar C0310 31) 10.0 mg/L 15.0 mg/L 3/week3 Composite Influent & Effluent Total Suspended Solids (TSS) 2 C0530 30.0 mg/L 45.0 mg/L 3/week3 Composite Influent & Effluent Ammonia (N13-N) (Apr 1 - Oct 31) C0610 1.4 mg/L 3.4 mg/L Weekly Composite Effluent Ammonia (N13-N) (Nov 1 - Mar 31) C0610 2.5 mg/L 6.2 mg/L Weekly Composite Effluent Enterococci (geometric mean) 61211 35/100 mL 264/100 mL 3/week3 Grab Effluent Feal Coliform 31616 Monitor and Report Weekly Grab Effluent Dissolved Oxygen (DO) 00300 Daily Average > 6.0 mg/L 3/week Grab Effluent pH 00400 Between 6.8 and 8.5 Standard Units 3/week Grab Effluent Temperature (°C) 00010 Monitor and Report Daily Grab Effluent Total Residual Chlorine (TRC) 4 50060 13 µg/L 3/week Grab Effluent Total Nitrogen' (mg/L) C0600 Monitor and Report Quarterly Calculated Effluent TKN (mg/L) 00625 Monitor and Report Quarterly Composite Effluent NO3-N + NO2-N (mg/L) 00630 Monitor and Report Quarterly Composite Effluent Total Phosphorus (mg/L) C0665 Monitor and Report Quarterly Composite Effluent Total Copper 6 01042 1.8 µg/L 1 2.9 µg/L Monthly Composite Effluent Total Nickel 6 (µg/L) 01067 Monitor and Report Quarterly Composite Effluent Total Zinc 6 01042 42.6 µg/L 47.6 µg/L Monthly Composite Effluent Dibromochloromethane 32105 10.5 µg/L 10.5 µg/L Monthly Composite Effluent Bromodichloromethane 32101 (=Dichlorobromomethane) Monitor and Report Monthly Composite Effluent Bis (2-ethylhexyl) phthalate 39100 0.2 µg/L 0.2 µg/L Monthly Composite Effluent Total Mercury 7 (ng/L) COMER Monitor and Report 1/five years Grab Effluent PFAS various Monitor and Report 2/year a Grab Effluent Acute Toxicity 9 TGE6C Monitor and Report Quarterly Composite Effluent Effluent Pollutant Scan 10 NCO] Monitor and Report Footnote 10 Footnote 10 Effluent Footnotes on the next page. ^Do'c'ulSiwgneld by: Aukft "C�1. b In.'' A �11G�tat ( C464531431644FF_. Page 5 of 14 Michael Montebello, NPDES Branch Chief Date: February 13, 2024