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HomeMy WebLinkAboutNC0047384_Permit Modification_19980211State of North Carolina Department of Environment and Natural Resources Division of Water Quality James B. Hunt, Jr., Governor Wayne McDevitt, Secretary A. Preston Howard, Jr., P.E., Director Mr. Arthur White City of Greensboro 2350 Huffine Mill Road McLeansville, North Carolina 27301 Dear Mr. White: A�� DEN R February 11, 1998 Subject: NPDES Permit Modification Permit No. NC0047384 T. Z. Osborne WWTP Guilford County A permit modification request was received by the Division on December 29, 1997. After review of the request, the modification to your NPDES permit has been approved. The following changes are incorporated: • Permitted flow is now 22.0 MGD instead of 20.0 MGD. • BOD monthly average (summer) is now 10.0 mg/l, daily maximum is 15.0 mg/l. • BOD monthly average (winter) is now 20.0 mg/l, daily maximum is 30.0 mg/l. • Ammonia limits are now 2.7 mg/1 (summer) and 5.4 mg/1 (winter). In light of information available regarding cyanide measurement techniques, the Division feels it is reasonable to specify the total cyanide quantitation limit as 10 µg/1 (10 ppb) in your NPDES permit. Levels reported as "<10 µg/1" will be considered zero for compliance purposes. Please find enclosed the amended Effluent Limitations page for outfall 001 which should be inserted into your permit upon completion of the upgrade in accordance with the Authorization to Construct (ATC) issued December 6, 1995. The old effluent sheet for flow at 20 MGD should be discarded. All other terms and conditions contained in the original permit remain unchanged and in full effect. This permit modification is issued pursuant to the requirements of North Carolina General Statutes 143-215.1 and the Memorandum of Agreement between North Carolina and the U.S. Environmental Protection Agency. If any parts, measurement frequencies, or sampling requirements contained in this permit 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, Post Office Drawer 27447, Raleigh, North Carolina 27611-7447. Unless such demand is made, this decision shall be final and binding. P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone (919) 733-5083 FAX (919) 733-0719 An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper If you have any questions regarding this modification to your permit, please contact Bethany Bolt at (919) 733-5083, Ext. 551. Sincerely, A/IPLGI' ?Ara64-e/4— . Preston Howard, Jr., P.E. cc: Central Files Winston-Salem Regional Office/Water Quality Section NPDES Unit Point Source Compliance Enforcement Unit Aquatic Toxicology Unit Technical Assistance and Certification Unit EPA/Roosevelt Childress S A. (1). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NC0047384 During the period beginning on the effective date of the permit and lasting until construction to expand to 30.0 MGD is complete, the Permittee is authorized to discharge from outfall(s) serial number 001. Such discharges shall be limited and monitored by the Permittee as specified below: ,'' .' -'� • + EFFI.UEN ::;�+CHA ACTERISTICS�• • :. t yn v�+ w . ,: 1 ... x .... .,._.,.C. _....., ...i.:.f.. ... .., �:.... Y4.t. ...«7 .1.>,.�}.-F_ .....'J.Y. Y N • ! r ... •r i'n A .. .. ..5 .. .: i , T _ . , ... a......... .. , , . 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Location w Flow 22.0 MGD Continuous Recording I or E BOD, 5 day, 20°C (April 1 - October 31)2 10.0 mg/l 15.0 mg/I Daily Composite E, I BOD, 5 day, 20°C (November 1 - March 31)2 20.0 mg/I 30.0 mg/l Daily Composite E, I _ Total Suspended Solids2 30.0 mg/1 45.0 mg/1 Daily Composite E, I , NH3 as N (April 1 - October 31) 2.7 mg/I Daily Composite E NH3 as N (November 1 - March 31) 5.4 mg/I Daily Composite E Dissolved Oxygen3 Daily' Grab E, U, D1, D2 pH4 Daily Grab E Fecal Coliform (geometric mean) 200 / 100 ml 400 / 100 ml Daily' Grab E, U, D1, D2 Temperature °C Daily' Grab E, U, D1, D2 Total Nitrogen (NO2 + NO3 + TKN) Monthly Composite E Total Phosphorus5 2.0 mg/I Weekly5 Composite E Total Residual Chlorine Daily Grab E Selenium 5.3 µg/l 20 µg/l Weekly Composite E Cadmium 2.1 µg/l 5.0 µg/I Weekly' Composite E, U, D1 Copper 2/Month Composite E Zinc 2/Month Composite E Cyanides 5.3 µg/I 21.2 µg/l Weekly Grab E Fluoride 1.9 mg/l Weekly Composite E Conductivity Weekly' Grab U, D1, D2 . Chronic Toxicity? Quarterly Composite E Notes: * Sample locations: E - Effluent, I - Influent, U - Upstream at Old US Highway 70, D1 - Downstream at SR 2821 (Harvest Road), D2 - Downstream at Huffine Farm Road. 1 Upstream and Downstream monitoring shall be grab samples and shall be conducted three times per week during the months of June, July, August, and September, and once per week during the remaining months of the year, except for Cadmium, which shall be monitored monthly. 2 The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal). 3 The daily average dissolved oxygen effluent concentration shall no be less than 5.0 mg/l. 4 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units. 5 Total Phosphorous compliance shall be based upon a quarterly average of weekly samples. 6 The quantitation limit for cyanide shall be 10.0 µg/l (10 ppb). Levels reported as "<10.0 µg/I" shall be considered zero for compliance purposes. 7 Chronic Toxicity (Ceriodaphnia) P/F at 90%; January, April, July, and October; See Part III, Condition G. There shall be no discharge of floating solids or visible foam in other than trace amounts.