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Home My WebLink AboutNC0074268_Technical Correction of Permit_20170804Water Resources ENVIRONMENTAL QUALITY August 4, 2017 Ms. Stephanie Scheringer, Division Manager, Wastewater Treatment Two Rivers Utilities P.O. Box 1748 Gastonia, North Carolina 28053 Dear Mr. Scheringer: ROY COOPER Governor MICHAEL S. REGAN Secretary S. JAY ZIMMERMAN Da ector Subject: Technical Correction NPDES Permit Permit NCO074268 Crowders Creek WWTP Gaston County Class IV Facility The Division of Water Resources (the Division) is correcting an error in your issued permit. The sample type for Total Cyanide should be a grab sample, not composite. Accordingly, we hereby forward the modified permit page to amend your permit. Please insert these change pages into your existing permit and discard the old pages. 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 permits that may be required. If you have questions, or if we can be of further service, please contact Teresa Rodriguez at Teresa.rodriguez@ncdenr.gov or 919-807-6387. Respectfully, ayZimm , irector ivision of Water Resources, NCDEQ Enclosure: Corrected Effluent Page Copies: NPDES Files Central Files DWR/Mooresville Regional Office / Water Quality Program Ecopy: US EPA Region 4 DWR/Aquatic Toxicology Branch/Susan Meadows State of North Carolina I Environmental Quality I Water Resources 1617 Mail Service Center I Raleigh, North Carolina 27699-1617 919 807 6300 Permit NCO074268 PART I - MONITORING, CONTROLS, AND LIMITATIONS FOR PERMITTED DISCHARGES A.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] (a.) 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: Footnotes 1 The permittee shall submit discharge monitoring reports electronically using NC DWR's eDMR application system. See Special Condition A (8 ) 2 The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal) 3 Facility shall report all effluent TRC values reported by a NC certified laboratory including field certified However, effluent values below 50 pg /L will be treated as zero for compliance purposes 4 For a given wastewater sample, TN = TKN + NO3-N + NO2-N, where TN is Total Nitrogen, TKN is Total Kjeldahl Nitrogen, and NO3-N and NO27N are Nitrate and Nitrite Nitrogen, respectively TP is Total Phosphorus. See Condition A (3 ) Total Nitrogen and Total Phosphorus Limits Page 3 of 12 EFFLUENT LIMITATIONS MONITORING REQUIREMENTS EFFLUENT Monthly Weekly Daily Measurement Sample Sample CHARACTERISTICS Average Average Maximum Frequency Type Location Flow 6.0 MGD Continuous Recording Influent or Effluent Total Monthly Flow Monitor and Report Monthly Recorded or Calculated Influent or Effluent BOD, 5 -day, 20°C z 13.0 mg/L 19.5 mg/L 2/Week Composite Influent & Effluent Total Suspended Solids z 30 0 mg/L 45.0 mg/L 2/Week Composite Influent & Effluent NH3 as N (April 1 - October 31) 2.0 mg/L 6.0 mg/L 2/Week Composite Effluent NH3 as N (November 1— March 31) 10.0 mg/L 30.0 mg/L 2/Week Composite Effluent Dissolved Oxygen Daily average >_ 6 0 mg/L Daily Grab Effluent Fecal Coliform 200/100 mL 400/100 mL 2/Week Grab Effluent (geometric mean) Temperature Daily Grab Effluent Hardness [CaCO3 or (Ca + Quarterly Composite Effluent Mg)] mg/L Total Cyanide (ug/1) Quarterly Grab Effluent pH >_ 6.0 and <— 9.0 standard units Daily Grab Effluent Total Residual Chlorine 3 28 pg/L Daily Grab Effluent TKN (mg/L) 6 Monitor and Report Weekly Composite Effluent NO3-N + NO2-N (mg/L) 6 Monitor and Report Weekly Composite Effluent TN 4 Monitor and Report Weekly Composite Effluent Monitor & Report (Ib/mo) Monthly Calculated TN Load 5.6 64,251 Ib/summer (eff. 4/1/17) Seasonally Calculated Effluent 90,672 Ib/winter (eff. 11/1/17) Seasonally Calculated TP (mg/L) 4 1 mg/L (monthly average) Weekly Composite Effluent (effective through 12/31/17) TP Load 6,6 Monitor & Report (Ib/mo) Monthly Calculated Effluent 18,265 Ib/yr (eff 1/1/18) Annually Calculated Chronic Toxicity' 1 1 1 Quarterly Composite Effluent Effluent Pollutant Scan 8 Monitor and Report Footnote 8 Footnote 8 Effluent Footnotes 1 The permittee shall submit discharge monitoring reports electronically using NC DWR's eDMR application system. See Special Condition A (8 ) 2 The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal) 3 Facility shall report all effluent TRC values reported by a NC certified laboratory including field certified However, effluent values below 50 pg /L will be treated as zero for compliance purposes 4 For a given wastewater sample, TN = TKN + NO3-N + NO2-N, where TN is Total Nitrogen, TKN is Total Kjeldahl Nitrogen, and NO3-N and NO27N are Nitrate and Nitrite Nitrogen, respectively TP is Total Phosphorus. See Condition A (3 ) Total Nitrogen and Total Phosphorus Limits Page 3 of 12 Permit NCO074268 5. TN or TP Load is the mass quantity of Total Nitrogen or Total Phosphorus discharged in a given period of time See Special Condition A (4 ), Calculation of TN or TP Loads. 6 Summer is defined as April 1 - October 31, winter is defined as November 1- March 31. Annual means on a calendar year basis, January 1 - December 31 7 Chronic Toxicity (Ceriodaphnia), P/F at 41% with testing in March, June, September and December. See Special Condition A (6 ) 8. See Special Condition A (7) Priority Pollutant Scan (b ) There shall be no discharge of floating solids or visible foam in other than trace amounts. A.(2.) INSTREAM SAMPLING [15A NCAC 02B.0500 et seq.] Instream monitoring is required for the following parameters at the locations specified: Parameter Frequency Sample Type Location' Dissolved Oxygen Footnote 2 Grab U, Dl, D2 Temperature Footnote 2 Grab U, D1, D2 Conductivity Footnote 2 Grab U, D1 Hardness Quarterly Grab U Footnotes* 1 U upstream at Highway 1108 (Crawford Rd.), D1 downstream at NCSR 2424 (Thompson Road); D2: downstream at SCSR 564 (Meek Rd) 2 Instream samples shall be grab samples taken 3/week (June -September) and 1/week (October -May) A.(3.) TOTAL NITROGEN AND TOTAL PHOSPHORUS LIMITS [G.S.143-215.1(b)] (a) Total Nitrogen (TN) allocations and load limits for NPDES dischargers in the Lake Wylie watershed are seasonal (summer and winter) values Summer is defined as April 1 through October 31, and winter is defined as November 1 through March 31. Total Phosphorus (TP) allocations and load limits are annual values and apply on a calendar year basis, January 1 through December 31. (b.) The TN (or TP) Load limit in this Permit may be modified as the result of allowable changes in the Permittee's allocation (i.) Allowable changes include those transfers resulting from the purchase, sale, trade, or lease of allocation between the Permittee and other dischargers assigned allocation under the 1995 Lake Wylie TMDL; regionalization (if both facilities were assigned allocation); and other transactions approved by the Division (ii.) The Permittee may request a modification of the TN (or TP) Load limit in this Permit to reflect allowable changes in its allocation. (A) The request must include an analysis demonstrating that change in allocations and limits does not have a reasonable potential to cause localized water quality impacts. (B) Upon receipt of timely and proper application, the Division will propose to modify the permit as appropriate and in accordance with state and federal program requirements. (C) Changes in TN or TP linuts become effective on the first January 1 (annual limit), the first April 1 (summer limit), or the first November 1 (winter limit) following permit modification. The Division must receive application no later than 180 days prior to the requested effective date for any limit change. (iii.) Any requests for modification should be sent to: Page 4 of 12