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Home My WebLink AboutNC0050342_permit modification_20090807ATA NCDENR North Carolina Department of Environment and Natural Resources Division of Water Quality Beverly Eaves Perdue Coleen H. Sullins Dee Freeman Governor Director Secretary August 7, 2009 Mr. David K. Saunders P.E. Director of Utilities City of Winston-Salem P.O. Box 2511 Winston-Salem, North Carolina 27102 Subject: Dear Mr. Saunders, Permit Modification NPDES Permit NC0050342 Muddy Creek WWTP Forsyth County On July 24, 2009, the Division of Water Quality issued NPDES Permit No. NC0050342 to the City of Winston- Salem. However, EPA requested the Division to change the mercury limits to meet the requirement of the 40 CFR Part 122.45 (d)(2). Therefore, the Division made a correction to the Effluent page. The Division also updated Toxicity test requirements on the Effluent page. Please insert the enclosed corrected effluent sheet and discard the old sheet. This permit modification becomes effective on the effective date of the permit. All other terms and conditions in the original permit remain unchanged and in full effect. These modifications are 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 December 6, 1983. 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. Sincerely, Coleen H. Sullins cc: US EPA, Marshall Hyatt (e-copy) WSRO-Surface Water Protection NPDES File Central Files 1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Location: 512 N. Salisbury St. Raleigh, North Carolina 27604 Phone: 919-807-63001 FAX: 919-807-6492 \ Customer Service: 1-877-623-6748 Internet www.ncwaterquality.org An Equal Opportunity : Affirmative Action Employer NorthCarolina Naturally Permit NC0050342 A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [001] 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: PARAMETER LIMITS MONITORING REQUIREMENTS Monthly Average Weekly Average Daily ` Maximum Measurement Frequency Sample Type Sample Locations Flow 21 MGD Continuous Recording Influent or Effluent CBOD, 5-Day, 200C2 25.0 mg/L 40.0 mg/L Daily Composite Influent & Effluent CBOD, 5-Day, 20°C Variable3 Grab U & D Total Suspended Solids2 30.0 mg/L 45.0 mg/L Daily Composite Influent & Effluent NH3 N (April 1 — October 31) 14.0 mg/L 35.0 mg/L Daily Composite Effluent NH3-N (November 1— March 31) Daily Composite Effluent NH3-N Variable3 Grab U & D Dissolved Oxygen.' Daily Average > 5.0 mg/L Daily Grab Effluent Dissolved Oxygen Variable3 Grab U & D Fecal Coliform (geometric mean) 200/100 mL 400/100 mL Daily Grab Effluent Fecal Coliform (geometric mean) Variable3 Grab U & D Total Residual Chlorines 28 pg/L Daily Average Daily Grab Effluent Total Nitrogen {NO2+NO3+TKN} Weekly Composite Effluent Total Phosphorus Weekly Composite Effluent Temperature, 0C Daily Grab Effluent Temperature, °C Variable3 Grab U & D Conductivity Daily Grab Effluent Conductivity Variable3 Grab U & D Chronic Toxicity6 Quarterly Composite Effluent pH > 6.0 and < 9.0 standard units Daily Grab Effluent Total Mercury 0.2162 pg/L 0.2162 pg/L 2/Month Grab Effluent Annual Pollutant Scan Annually , See A. (5) Effluent Notes: 1. The effluent composite sampling location is established at the parshall flume immediately below the chlorine injection point. 2. The monthly average effluent CBOD5 and Total Suspended Solids concentrations shall not exceed 15% of their respective influent values (85% removal). 3. U: upstream at Idols Dam. D: downstream 0.26 miles below U.S. Highway 64. Instream sampling requirements are provisionally waived in light of the permittee's participation in the Yadkin -Pee Dee River Basin Association. Should participation in the Association cease, all instream sampling requirements are immediately reinstated. Should instream sampling be reinstated, grab samples shall be collected 3/week during the months of June, July, August, and September and weekly during the remainder of the year. 4. Effluent samples shall be taken prior to entering the 5 mile outfall line. 5. Facility shall report all effluent TRC values reported by a NC certified laboratory including field certified. However, effluent values below 50 µg /L will be treated as zero for compliance purposes. 6. Chronic Toxicity (Ceriodaphnia) P/F @ 5.5%; January, April, July, October [see A. (3)]. There shall be no discharge of floating solids or foam visible in other than trace amounts.