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Home My WebLink AboutNC0024201_Permit (Modification)_20060613NPDES DOCUHEN'I' :SCANNING COVER SHEET NC0024201 Roanoke River WWTP NPDES Permit: Document Type: Permit Issuance Wasteload Allocation Authorization to Construct (AtC) Permit Modification -.., Complete File - Historical Engineering Alternatives (EAA) Correspondence Owner Name Change Report Instream Assessment (67b) Speculative Limits Environmental Assessment (EA) Document Date: June 13, 2006 This document is printed on reuse paper - ignore any content on the reverse side Michael F. Easley, Governor el William G. Ross, Jr., Secretary North Carolina Department of Environment and Natural Resources Alan W. Klimek, P.E., Director Division of Water Quality June 13, 2006 R. Danieley Brown, P.E. Roanoke Rapids Sanitary District PO Box 308 Roanoke Rapids, NC 27870 Subject: Request for Permit Modification Roanoke Rapids WWTP NPDES Permit NC0024201 Halifax County Dear Mr. Brown: The Division of Water Quality has received your permit modification request dated May 24, 2006, for the Roanoke Rapids Wastewater Treatment Plant. Permit modifications requesting the removal of an effluent parameter from an NPDES permit is considered a major modification to the permit. Such a change, if implemented, would subject the permit to the same public notice procedures as issuing a new or renewed permit. In addition, because your facility is classified as a major municipal, any major modifications to your permit would have to receive concurrent approval from the U.S. Environmental Protection Agency (EPA). Given the above, and since your permit expires on March 31, 2007, and since the renewal process is scheduled to begin within the next few months, this office will evaluate your request to remove the mercury effluent limit during your NPDES permit renewal process. We can, however, at this time reduce the measurement frequency requirement for the effluent and upstream mercury from weekly to monthly. Accordingly, we are forwarding herewith the attached modified NPDES permit. Please insert the attached permit pages into your permit and discard the old ones. 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. EPA dated May 9, 1994 (or as subsequently amended). As a reminder, your permit renewal application is due to the Division postmarked no later than October 2, 2006, in order to satisfy the conditions of your NPDES permit. If you have questions regarding any of the above, please feel free to contact Vanessa Manuel at 919/733- 5083, extension 532. Attachments Cc: Central Files NPDES File DWQ/S W P Raleigh Regional Office DWQ/ESS Aquatic Toxicology Unit EPA Region 4, Roosevelt Childress `7 / Alan W. Klimek, P.E. �onf One No hCaro]ina atura/llf North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone (919) 733-5083 Customer Service Internet www.newatereualitv.org 512 N. Salisbury St. Raleigh, NC 27604 FAX (919) 733-0719 1-877-623-6748 An Equal Opportunity/Affirmative Action Employer — 50% Recycled/10% Post Consumer Paper Permit NC002420I STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY PERMIT TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards and regulations promulgated and adopted by the North Carolina Environmental Management Commission, and the Federal Water Pollution Control Act, as amended, the Roanoke Rapids Sanitary District is hereby authorized to discharge wastewater from a facility located at the Roanoke Rapids Sanitary District WWTP 135 Aqueduct Road Weldon Halifax County to receiving waters designated as Chockoyotte Creek at the Roanoke River in the Roanoke River Basin in accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, and III hereof. The permit shall become effective July 1, 2006. This permit and the authorization to discharge shall expire at midnight on March 31, 2007. Signed this day June 13, 2006. an W. Klimek, P.E., Director Division of Water Quality By Authority of the Environmental Management Commission Permit NC0024201 A. (3) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (DISCHARGES AFTER OUTFALL RELOCATION) Beginning July 1, 2006, and lasting until March 31, 2007, the permittee is authorized to discharge treated wastewater from outfall 001. Such discharges shall be limited and monitored by the permittee as specified below: EFFLUENT CHARACTERISTICS • EFFLUENT LIMITATIONS MONITORING REQUIREMENTS Monthly Average Weekly Average Daily Maximum Measurement Frequency Sample Type Sample Locations Flow 8.34 MGD Continuous Recording Influent or Effluent CBOD, 5-day, 20°C2 25.0 mg/L 37.5 mg/L Daily Composite Influent & Effluent Total Suspended Solids2 30.0 mg/L 45.0 mg/L Daily Composite Influent & Effluent NH3 as N Daily Composite Effluent Total Residual Chlorine 28 µg/L Daily Grab Effluent Fecal Coliform (geometric mean) 200/ 100 ml 400/ 100 ml Daily Grab Effluent pH Between 6.0 and 9.0 Standard Units Daily Grab Effluent Dissolved Oxygen Daily Grab Effluent Temperature Daily Grab Effluent Total Nitrogen (NO2 + NO3 + TKN) Monthly Composite Effluent Total Phosphorus Monthly Composite Effluent Total Mercury 0.868 µg/L Monthly Grab Effluent, U Total Copper Monthly Composite Effluent Total Zinc Monthly Composite Effluent Total Selenium Monthly Composite Effluent Total Fluoride Monthly Composite Effluent Chronic Toxicity3 Quarterly Composite Effluent Dissolved Oxygen Variable4 Grab U, D Temperature Variable4 Grab U, D Notes: 1. U: Upstream at 308 Rollingwood Road. D: Downstream at the U.S. 158 crossing at the Roanoke River. 2. The monthly average effluent CBOD5 and TSS concentrations shall not exceed 15% of the respective influent value (85% removal). 3. Chronic Toxicity (Ceriodaphnia) at 1.1 %; January, April, July and October (see condition A. (5)). 4. Upstream/downstream samples shall be collected 3/Week during June, July, August, September, and 1/Week during the remaining months of the year. Stream sampling may be discontinued at such times as flow conditions in the receiving waters or extreme weather conditions will result in substantial risk of injury or death to persons collecting samples. In such cases, on each day that sampling is discontinued, written justification for the discontinuance shall be specified in the monitoring report for the month in which the event occurred. Stream sampling shall be resumed at the first opportunity after the risk period has ceased. There shall be no discharge of floating solids or visible foam in other than trace amounts. 1000 Jackson Street 1 a 7� P. 0. Box 308 Roanoke Rapids Sanitary District _.,_ Ro,�noke.Rapids,NC27870 v:a� ,..�.,._... .�...; 252) 537-9137 Fax (252) 537-3064 www.rrsd.orq May 24, 2006 Charles H. Weaver, Jr. NPDES Unit, Division of Water Quality 1617 Mail Service Center Raleigh, North Carolina, 27699-1617 RE: Request for Minor Pen" it Modification Roanoke Rapids Sanitary District Wastewater Treatment Plant NPDES Permit No. NC0024201 Dear Mr. Weaver, i/ig 2 5 2006 The Roanoke Rapids Sanitary District (RRSD) Wastewater Treatment Plant (WWTP) currently discharges to the Roanoke River upstream of Chockoyotte Creek. Our National Pollutant Discharge Elimination System (NPDES) permit contains a weekly effluent mercury limit of 0.868 µg/I and weekly monitoring of mercury upstream of our outfall. We have been collecting mercury samples from April 2005 to the present time (twelve months of data). This monitoring data is provided in the attached Table 1. Both the effluent discharge and upstream concentrations of mercury were below the detection limit for all sampling events. Our NPDES permit contains a metals re -opener clause that states that after twelve months of sampling and monitoring, RRSD may request a modification of the effluent limitation and upstream monitoring for metals (NPDES Condition A(7)). The RRSD respectfully requests, a minor modification to our NPDES permit to remove the effluent mercury limitation for a discharge to the Roanoke River. We also request that the monitoring frequency be reduced from weekly to monthly. We have met the sampling and monitoring requirements of our permit, and our data shows that significant levels of mercury were not detected at either sampling location. We very much appreciate the time and effort of the NPDES Unit to consider the re -opening of our NPDES permit to address this mercury issue. We thank you for your consideration of this request and we look forward to your response. Please do not hesitate to call myself (252-537-9137) or Mary Sadler with ARCADIS (919-854-1282) if you have any questions. Sincerely, Roanoke Rapids Sanitary District R. Danieley Brown, P.E. Chief Executive Officer Table 1: Mercury Sampling Results for the Roanoke Rapids Sanitary District NPDES Permit Date Mercury Concentration (mg/1) -7(,,r�e Upstream of Outfall 001 Outfall 001 4/18/05 < 0.0002 < 0.0002 4/29/05 < 0.0002 < 0.0002 5/4/05 < 0.0002 < 0.0002 5/12/05 < 0.0002 < 0.0002 5/19/05 < 0.0002 < 0.0002 5/26/05 < 0.0002 < 0.0002 6/2/05 < 0.0002 < 0.0002 6/7/05 < 0.0002 < 0.0002 6/15/05 < 0.0002 < 0.0002 6/22/05 < 0.0002 < 0.0002 6/29/05 < 0.0002 < 0.0002 7/7/05 < 0.0002 < 0.0002 7/11/05 < 0.0002 < 0.0002 7/19/05 < 0.0002 < 0.0002 7/27/05 < 0.0002 < 0.0002 8/3/05 < 0.0002 < 0.0002 8/10/05 < 0.0002 < 0.0002 8/17/05 < 0.0002 < 0.0002 8/25/05 < 0.0002 < 0.0002 8/31/05 < 0.0002 < 0.0002 9/8/05 < 0.0002 < 0.0002 9/14/05 < 0.0002 < 0.0002 9/21/05 < 0.0002 < 0.0002 9/28/05 < 0.0002 < 0.0002 10/5/05 < 0.0002 < 0.0002 10/12/05 < 0.0002 < 0.0002 10/19/05 < 0.0002 < 0.0002 10/26/05 < 0.0002 < 0.0002 11/2/05 < 0.0002 < 0.0002 11/7/05 < 0.0002 < 0.0002 11/16/05 < 0.0002 < 0.0002 11/22/05 < 0.0002 < 0.0002 11/30/05 < 0.0002 < 0.0002 12/7/05 < 0.0002 < 0.0002 12/19/05 < 0.0002 < 0.0002 1/4/06 < 0.0002 < 0.0002 1/9/06 < 0.0002 < 0.0002 1/19/06 < 0.0002 < 0.0002 1/24/06 < 0.0002 < 0.0002 2/1/06 < 0.0002 < 0.0002 2/8/06 < 0.0002 < 0.0002 2/16/06 < 0.0002 < 0.0002 2/21/06 < 0.0002 < 0.0002 3/2/06 < 0.0002 < 0.0002 3/9/06 < 0.0002 < 0.0002 3/18/06 < 0.0002 < 0.0002 3/23/06 < 0.0002 < 0.0002 3/3