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Home My WebLink AboutNC0020940_Permit Modification_20040520NPDES DOCUWENT SCANNINO COVER SHEET NC0020940 NPDES Permit: Murphy WWTP Document Type: Permit Issuance Wasteload Allocation Authorization to Construct (AtC) Permit Modification Complete File -Historical Engineering Alternatives (EAA) Report Instream Assessment (67b) Speculative Limits Environmental Assessment (EA) Document Date: May 20, 2004 Miss document 3s praiated oa reuece paper - %aare any content oa the re''erne aside Ms. Anna Payne Town Manager P.O. Box 130 Murphy, North Carolina Dear Ms. Payne: 4'w NCDENR 28906 Michael F. Easley Governor William G. Ross, Jr., Secretary North Carolina Department of Environment and Natural Resources Alan W. Klimek, P.E., Director Division of Water Quality May 20, 2004 Subject: Modification of NPDES Permit NC0020940 Murphy WWTP Cherokee County The Division issued the subject permit on November 26, 2003. That permit contained a footnote on the Effluent Limits and Monitoring Requirements pages that stipulated the use of EPA Method 1631 for Total Mercury analyses. Further review of the permit file has found this requirement to be incorrect; your facility's Total Mercury limits are higher than the threshold requiring use of method 1631. This modification removes the footnote requiring Method 1631. Note that no limits or monitoring frequencies have been changed. No other changes to the permit have been made. Please find enclosed the revised pages, which should be inserted into your permit. The old pages may then be discarded. All other terms and conditions contained in the original permit remain unchanged and in full effect. This permit modification is issued under 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 a written petition conforming to Chapter 150B of the North Carolina General Statutes, 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. If you have any questions concerning this permit modification, please contact Charles Weaver of the NPDES Unit at (919) 733-5083, extension 511. cc: Central Files Asheville Regional Office, Water Quality Section NPDES Unit EPA Region IV / Madolyn Dominy 1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Sincerely, Alan W. Klimek, P. Telephone (919) 733-5083 FAX (919) 733.0719 An Equal Opportunity Affirmative Action Employer Visrr us ON THE INTERNET @ http://h2o.enr.state.nc.us/NPDES Permit NC0020940 A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (0.925 MGD) During the period beginning on January 1, 2004 and lasting until expansion above 0.925 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: EfFUENT CHARACTERISTICS LIMITS MONITORING REQUIREMENTS Monthly Ave a e Weekly Average Daily Maximum Measl rej ent a it fo Sample Type Sample Location Flow 0.925 MGD Continuous Recording Influent or Effluent BOD, 5-day (209-C)' 30.0 mg/L 45.0 mg/L 3/Week Composite Effluent, Influent Total Suspended Solids' 30.0 mg/L 45.0 mg/L 3/Week Composite Effluent, Influent NH3 as N 3/Week Composite Effluent pH Between 6.0 and 9.0 standard units 3iWeek Grab Effluent Fecal Coliform (geometric mean) 200 / 100 mL 400 / 100 mL 3/Week Grab Effluent Total Residual Chlorine 28 µg/L 3/Week Grab Effluent , Temperature (9C) Daily Grab Effluent Total Cyanide 343 µg/L 22 µg/L Weekly • Grab Effluent Total Mercury 0.8 µg/L Weekly Grab Effluent Total Silver Weekly Composite Effluent Total Nitrogen (NO2 + NO3 + TKN) Semi -Annually Composite Effluent Total Phosphorus Semi -Annually Composite Effluent Chronic Toxicity2 Quarterly Composite Effluent Notes: 1. The monthly average BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal). 2. Chronic Toxicity (Ceriodaphnia) P/F at 1.5%; tests shall be conducted in March, June, September and December [see A. (3) for further details]. Chronic toxicity sampling shall coincide with metals sampling. There shall be no discharge of floating solids or visible foam in other than trace amounts. Permit NC0020940 A. (2) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (1.4 MGD) During the period beginning upon expansion above 0.925 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: EFFLUENT CHARACTERISTICS LIMITS MONITORING REQUIREMENTS Monthly Average Weekly Average Daily Maximum Measurement Frequency Sample Type Sample Location Flow 1.4 MGD Continuous Recording Influent or Effluent BOD, 5-day (20°C)l 30.0 mg/L 45.0 mg/L 3/Week Composite ` Effluent, Influent Total Suspended Solids' 30.0 mg/L 45.0 mg/L 3/Week Composite Effluent, Influent NH3 as N 3/Week Composite Effluent pH Between 6.0 and 9.0 standard units 3/Week Grab Effluent Fecal Coliform (geometric mean) 200 / 100 ml 400 / 100 ml 3/Week Grab Effluent Total Residual Chlorine 28 µg/L 3/Week Grab Effluent Temperature (°C) Daily Grab Effluent Total Cyanide 228 µg/L 22 µg/L Weekly Grab Effluent Total Mercury 0.6 µg/L Weekly Composite Effluent Total Silver Weekly Composite Effluent Total Nitrogen (NO2 + NO3 + TKN) Semi -Annually Composite Effluent Total Phosphorus Semi -Annually Composite Effluent Chronic Toxicity2 Quarterly Composite Effluent Notes: 1. The monthly average BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal) . 2. Chronic Toxicity (Ceriodaphnia) P/F at 2.2%; tests shall be conducted in March, June, September and December [see A. (4) for further details). Chronic toxicity sampling shall coincide with metals sampling. There shall be no discharge of floating solids or visible foam in other than trace amounts. imap://charles.weaver%40dwg.denr.ncmail.net@cros.ncmail.net:143/f... Subject: murphy mod From: Mike Templeton <mike.templeton@ncmail.net> Date: Thu, 20 May 2004 10:15:39 -0400 To: Charles Weaver <Charles.Weaver@ncmail.net> Charles - Please prep a permit mod for the Murphy WWTP, NC0020940. Both effluent sheets have a footnote requiring that Method 1631 be used for mercury analyses. However, Murphy is not on the list of "1631 facilities," and their mercury limits are high enough that the 245 method is adequate. I discussed it with Tom, and he agrees with the mod. If you need to contact the Town for any reason, the operator I spoke with is Scott Hilton, 828-837-5035. Thanks. - Mike T Michael E. Templeton, '. F. North Carolina Division of Water: Quality NPDES Unit 1617 Mail Service Centel, Ra eigh, NC 27699-1617 919-733-0719 mailto:nike.templeton@ncmail.net 919-733-5083 x541 F =.X: 1 of 1 5/20/2004 11:19 AM