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Home My WebLink AboutNC0021121_Permit (Correction)_20201118DocuSign Envelope ID: 4D4DB5A0-4C4A-4DFF-A3C8-4214C0964EA1 ROY COOPER Governor MICHAEL S. REGAN Secretary S. DANIEL SMITH Director Mr. Chris Marion, ORC Town of Mount Airy PO Box 70 Mount Airy, North Carolina 27030 Dear Mr. Marion: NORTH CAROLINA Environmental Quality November 18, 2020 Subject: Technical Correction for NPDES Permit Permit NCO021121 Mount Airy WWTP Surry County Grade IV Biological WPCS SIC Code 4952 Division personnel have reviewed and approved two minor corrections of the subject permit. The following corrections have been made: • Footnote 8 in Section A. (L) Effluent Limitations and Monitoring Requirements (1.5 MGD) was found misplaced at Chronic Toxicity, which should be footnote 9, affecting the remaining footnote numbers. Footnote 8 has been placed at Total Copper and at Total Zinc, and the remaining footnote numbers have been adjusted accordingly; and • The header in Section A. (3.) has been corrected to read: "CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)". We are forwarding you the new Page 3: Section A. (1.) Effluent Limitations and Monitoring Requirements, and Page 7: Section A. (3.) Chronic Toxicity. You should replace your existing pages 3 and 7 with these revised pages. This permit revision is effective immediately and is issued pursuant to the requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement between North Carolina and the U.S. Environmental Protection Agency dated October 15, 2007 (or as subsequently amended). If any parts, measurement frequencies or sampling requirements contained in this permit are unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty (30) days following receipt of this letter. This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings (6714 Mail Service Center, Raleigh, North Carolina 27699- 6714). Unless such demand is made, this decision shall be final and binding. DE Q�� North Carolina Department of Environmental Quality I Division of Water Resources _ 512 North Salisbury Street 1 1617 Mail Service Center I Raleigh, North Carolina 27699-1617 NORTH CAROLINA oecod—t of E,W—ooeeeei aual� 919.707.9000 DocuSign Envelope ID: 4D4DB5A0-4C4A-4DFF-A3C8-4214C0964EA1 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, �ADo'c'u,Siwgne'd b�y:A `'w � Ip.'' L C464531431644FE... for S. Daniel Smith, Director Division of Water Resources, NCDEQ Hardcopy: NPDES Files Central Files eCopy: US EPA Region 4 DWR/Winston-Salem Regional Office/Water Quality/Lon Snider DWR/Ecosystems Branch/Mark Vander Borgh DWR/Aquatic Toxicology Branch/Zachary Thomas Page 2 of 2 DocuSign Envelope ID: 4D4DB5A0-4C4A-4DFF-A3C8-4214C0964EA1 PART Permit NCO021121 A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - Outfall 001 [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] Grade IV Biological Water Pollution Control System [15A NCAC 08G .0302] a. Beginning on the effective date and lasting until permit expiration, the Permittee is authorized to discharge treated wastewater from the Wastewater Treatment Plant via Outfall 001. Such discharges shall be limited and monitored' by the Permittee as specified below: EFFLUENT CHARACTERISTICS LIMITS MONITORING REQUIREMENTS Monthly Weekly Daily Measurement Sample Type Sample Parameter Code Average Average Maximum Frequency Location z Flow 50050 7.0 MGD Continuous RecordingInfluent or Effluent BOD, 5-day, 200C 3 C0310 30.0 mg/L 45.0 mg/L 2/week 4 Composite Influent and Effluent Total Suspended Solids (TSS) 3 C0530 30.0 mg/L 45.0 mg/L 2/week 4 Composite Influent and Effluent Ammonia (NH3-N) Summer 2.1 mg/L 6.3 mg/L Daily Composite Effluent (Apr 1 - Oct 31) C0610 Ammonia (NH3-N) Winter 6.3 mg/L 18.9 mg/L Daily Composite Effluent (Nov 1 - Mar 31) Dissolved Oxygen (DO) 00300 Daily Average >_ 5.0 mg/L Daily Grab Effluent Fecal Coliform 31616 200/100 mL 400/100 mL 2/week 4 Grab Effluent (geometric mean) Total Residual Chlorine (TRC) 5 50060 28.0 µg/L Daily Grab Effluent pH 00400 Between 6.0 and 9.0 Standard Units Daily Grab Effluent Temperature (°C) 00010 Monitor and Report Daily Grab Effluent Conductivity (pmhos/cm) 00094 Monitor and Report Weekly Grab Effluent Total Nitrogen (NO2 + NO3 + TKN) (mg/L) C0600 Monitor and Report Monthly Composite Effluent Total Phosphorus (mg/L) C0665 Monitor and Report Monthly Composite Effluent Total Hardness (as CaCO3) 00900 Monitor and Report p Quarter) Y Composite p Effluent (mg/L) 5 Total Copper 7,8 01042 29.7 pg/L 35.9 pg/L Monthly Composite Effluent Total Zinc 8 01077 447 pg/L 447 pg/L Monthly Composite Effluent Chronic Toxicity 9 TGP3B Monitor and Report Quarterly Composite Effluent Effluent Pollutant Scan NC01 Monitor and Report Footnote 10 Footnote 10 Effluent Total Hardness (as CaCO3) 00900 Monitor and Report P Quarter) Y Grab Upstream p (mg/L) 11 Dissolved Oxygen (mg/L) 00300 Monitor and Report Variable 2 Grab Upstream, Downstream Temperature (°C) 00010 Monitor and Report Variable 2 Grab Upstream, Downstream Footnotes on next DaLye. Page 3 of 12 ,for CAk� DowSigned by: Au� C464531431644FE... S. Daniel Smith, Director Division of Water Resources By Authority of the Environmental Management Commission Revised 11/6/2020 DocuSign Envelope ID: 4D4DB5A0-4C4A-4DFF-A3C8-4214C0964EA1 Permit NCO021121 A. (3.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY) [15ANCAC 02B .0200 et seq.] The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia dubia at an effluent concentration of 42%. The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," (Revised December 2010, or subsequent versions) or "North Carolina Phase Il Chronic Whole Effluent Toxicity Test Procedure" (Revised December 2010, or subsequent versions). The tests will be performed during the months of January, April, July, and October. These months signify the first month of each three-month toxicity testing quarter assigned to the facility. Effluent sampling for this testing must be obtained during representative effluent discharge and 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 -December 2010, or subsequent versions). All toxicity testing results required as part of this permit condition will be entered electronically using the Division's eDMR system 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, DWR Form AT-3 (original) is to be sent to the following address: North Carolina Division of Water Resources Water Sciences Section/Aquatic Toxicology Branch 1621 Mail Service Center Raleigh, NC 27699-1621 Or, results can be sent to the email, ATForms.ATBgncdenr.gov. Completed Aquatic Toxicity Test Forms shall be filed with the Water 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 Water 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. Assessment of toxicity compliance is based on the toxicity testing quarter, which is the three-month time interval that begins on t oe�I� i, b4ay of the month in which ELtc�1 au,lkhlnjt,lot Vh Page 7 of 12 fOPC464531431644FE... S. Daniel Smith, Director Division of Water Resources By Authority of the Environmental Management Commission Revised 11/6/2020 Docu5�". 6 S E C U R E 6 Certificate Of Completion Envelope Id: 4D4DB5AO4C4A4DFFA3C84214CO964EA1 Status: Completed Subject: Please DocuSign: 21121 Tech Corr pkg.pdf Source Envelope: Document Pages: 4 Signatures: 3 Envelope Originator: Certificate Pages: 1 Initials: 0 Gary Perlmutter AutoNav: Enabled 217 W. Jones Street Envelopeld Stamping: Enabled Raleigh, NC 27699 Time Zone: (UTC-08:00) Pacific Time (US & Canada) gary.perlmutter@ncdenr.gov I Address: 149.168.204.10 Record Tracking Status: Original Holder: Gary Perlmutter Location: DocuSign 11/18/2020 5:27:02 AM gary.perlmutter@ncdenr.gov Security Appliance Status: Connected Pool: StateLocal Storage Appliance Status: Connected Pool: North Carolina Department of Environmental Location: DocuSign Quality Signer Events Signature Timestamp Michael Montebello Sent: 11/18/2020 5:28:17 AM Michael.Montebello@ncdenr.gov ''S'g /Idby. 'Lt(A'1-bin.}t tVb ED Viewed: 11/18/2020 12:25:23 PM Water Resources C464531431644FE Signed: 11/18/2020 12:26:18 PM Security Level: Email, Account Authentication Freeform Signing (None) Signature Adoption: Pre -selected Style Using IP Address: 69.155.2.100 Electronic Record and Signature Disclosure: Not Offered via DocuSign In Person Signer Events Signature Timestamp Editor Delivery Events Status Timestamp Agent Delivery Events Status Timestamp Intermediary Delivery Events Status Timestamp Certified Delivery Events Status Timestamp Carbon Copy Events Status Timestamp Witness Events Signature Timestamp Notary Events Signature Timestamp Envelope Summary Events Status Timestamps Envelope Sent Hashed/Encrypted 11/18/2020 5:28:17 AM Certified Delivered Security Checked 11/18/2020 12:25:23 PM Signing Complete Security Checked 11/18/2020 12:26:18 PM Completed Security Checked 11/18/2020 12:26:18 PM Payment Events Status Timestamps