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Home My WebLink AboutNC0022900_Permit (Modification)_20240524DocuSign Envelope ID: EB863FB8-B2D6-4D48-9E2A-2E0262D250A1 ROY COOPER Governor ELIZABETH S. BISER Secretary RICHARD E. ROGERS, JR. Director NORTH CAROLINA Environmental Quality 5/24/2024 Carolina Water Service, Inc. of North Carolina Attn: Travis Thomas, ORC P.O. Box 240908 Charlotte, NC 28224 Subject: NPDES Permit NCO022900 Minor Modification Sugar Mountain WWTP Avery County Dear Permittee: The Division has received and approved your request to change Flow monitoring from Influent to Effluent. This modification documents the change in monitoring location. Remove pages 3 and 4 of your existing permit and replace them with the attached pages. No other changes have been made to the permit. This permit modification 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). Insert the attached pages into your permit and discard the old pages. If any parts, measurement frequencies or sampling requirements contained in this modification 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. 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 any other Federal, State, or Local governmental regulation. If you have any questions concerning these changes, please contact Kate Shadwell [kate.shadwell@deq.nc.gov]. Sincerely, Docu/Signed by: 8328B44CE9EMA1... John E. Hennessy Section Chief Regional Operations Division of Water Resources ec: NPDES Unit (Laserfiche) North Carolina Department of Environmental Quality I Division of Water Resources :!��caao�i DW 512 North Salisbury Street 1 1611 Mail Service Center I Raleigh, North Carolina 27699-1611 NORT919.707.9000 DocuSign Envelope ID: EB863FB8-B2D6-4D48-9E2A-2E0262D250A1 Permit NCO022900 PART I. A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS — 0.5 MGD [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] Grade III Biological Water Pollution Control System [15A NCAC 08G .0302] During the period beginning on the effective date of this permit and lasting until expansion above 0.5 MGD or expiration, the Permittee is authorized to discharge from outfall 001. Such discharges shall be limited and monitored' by the Permittee as specified below: PARAMETERS Limits Monitoring Requirements Monthly Daily Measurement Sample Sample eDMR Code Average Maximum Frequency Type 2 Location Flow 50050 0.50 MGD Continuous Recording Effluent BOD, 5-day (20°C) C0310 30.0 mg/L 45.0 mg/L 3/Week Composite Effluent Total Suspended Solids C0530 30.0 mg/L 45.0 mg/L 3/Week Composite Effluent NH3 as N April 1 — October 31 C0610 12.0 mg/L 35.0 mg/L 3/Week Composite Effluent NH3 as N November 1 — March 31 C0610 Monitor and Report 3/Week Composite Effluent NH3 as N April 1 — October 31 s C0610 2.0 mg/L 10.0 mg/L 3/Week Composite Effluent NH3 as N s November 1 — March 31 C0610 4.0 mg/L 20.0 mg/L 3/Week Composite Effluent Dissolved Oxygen3 00300 See footnote 3 3/Week Grab Effluent Dissolved Oxygen3 00300 Monitor and Report Variable Grab Upstream & Downstream Fecal Coliform (geometric mean) 31616 200/100 mL 400/100 mL 3/Week Grab Effluent Total Residual Chlorine 4 50060 24 ug/L 3/Week Grab Effluent TRC Temperature (°C) 00010 Monitor and Report Daily Grab Effluent Temperature (°C) 00010 Monitor and Report Variable Grab Upstream & Downstream Total Nitrogen NO2+NO3+TKN C0600 Monitor and Report Semi -Annually Composite Effluent Total Phosphorus C0665 Monitor and Report Semi -Annually Composite Effluent 1pH 5 00400 Monitor and Report 3/Week Grab Effluent Footnotes: 1. The Permittee shall submit discharge monitoring reports electronically using the NC DWR's eDMR system [see A. (3.)]. 2. Upstream = 100 feet above discharge location; Downstream = 100 ft below discharge location. Upstream and downstream sampling are to be performed 3/Week during the months of June, July, August and September and once/week during the rest of the year. Page 3 of 7 DocuSign Envelope ID: EB863FB8-B2D6-4D48-9E2A-2E0262D250A1 Permit NCO022900 3. The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/L from April 1 — October and not less than 5.0 mg/L from November 1 — March 31. 4. The Division shall consider all effluent TRC values reported below 50 µg/L to be in compliance with the permit. However, the Permittee shall continue to record and submit all values reported by a North Carolina certified laboratory (including field certified), even if these values fall below 50 µg/L. 5. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units. 6. NH3 effluent limits take effect I/I/2028. Until then, the permittee shall monitor NH3 with previous effluent limits. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS — 1.0 MGD [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] Grade III Biological Water Pollution Control System [15A NCAC 08G .0302] During the period beginning upon expansion above 0.5 MGD 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: PARAMETERS Limits Monitoring Requirements Monthly Daily Measurement Sample Sample eDMR Code Average Maximum Frequency Type Location Flow 50050 1.0 MGD Continuous Recording Effluent BOD, 5-day (20°C) C0310 30.0 mg/L 45.0 mg/L 3/Week Composite Effluent Total Suspended Solids C0530 30.0 mg/L 45.0 mg/L 3/Week Composite Effluent NH3 as N April 1 — October 31 C0610 1.2 mg/L 6.0 mg/L 3/Week Composite Effluent NH3 as N November 1 — March 31 C0610 2.2 mg/L 11.0 mg/L 3/Week Composite Effluent Dissolved Oxygen 00300 See footnote 3 3/Week Grab Effluent Dissolved Oxygen 00300 Monitor and Report Variable Grab UpstreamDownstream Fecal Coliform (geometric mean) 31616 200/100 mL 400/100 mL 3/Week Grab Effluent Total Residual Chlorine 4 50060 20 ug/L 3/Week Grab Effluent TRC Temperature (°C) 00010 Monitor and Report Daily Grab Effluent Temperature (°C) 00010 Monitor and Report Variable Grab Upstream & Downstream Total Nitrogen NO2+NO3+TKN C0600 Monitor and Report Semi -Annually Composite Effluent Total Phosphorus C0665 Monitor and Report Semi -Annually Composite Effluent Page 4 of 7