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Home My WebLink AboutNC0036668_Permit (Modification)_20130117NPDES DOCUMENT SCANNING COVER SHEET NC0036668 NPDES Permit: Kenansville WWTP Document Type: Permit Issuance Wasteload Allocation Authorization to Construct (AtC) Permit Modification Complete File - Historical Engineering Alternatives (EAA) Correspondence Owner Name Change Instream Assessment (67b) Speculative Limits Environmental Assessment (EA) Document Date: January 17, 2013 This document is printed tart reuse paper - igiriore any content on the resrerse side •u ArA witr NCDENR North Carolina Department of Environment and Natural Resources Division of Water Quality Beverly Eaves Perdue Charles Wakild, P.E. Dee Freeman Governor Director Secretary January 7, 2013 Mr. Eric Coman Town Manager Town of Kenansville P.O. Box 370 Kenansville, North Carolina 28349-0370 Subject: NPDES PERMIT MODIFICATION Permit Number NC0036668 Kenansville WWTP Duplin County Dear Mr. Coman: Division personnel have reviewed and approved your request for modification of the subject permit. This permit modification reinstates a component removed from the Supplement to Cover Page of the above referenced permit during its last renewal. The attached page should be placed in the permit and the old page discarded. 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). If you have any questions or need additional information, please do not hesitate to contact Maureen Kinney of my staff at (919) 807-6388. Charles Wakild, P.E. cc: Central Files NPDES Unit Files Wilmington Regional Office, Surface Water Protection Section 1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Location: 512 N. Salisbury St Raleigh, North Carolina 27604 Phone: 919-807-6300 l FAX: 919-807-6492 Internet http:llportal.ncdenr.orglwebhwglhome NonrthCarolina 1VaturaIIij An Equal opportunity 1 Affirmative Action Employer Permit NC0036668 SUPPLEMENT TO PERMIT COVER SHEET All previous NPDES permits issued to this facility, whether for operation or discharge are hereby revoked. As of this permit issuance, any previously issued permit bearing this number is no longer effective. Therefore, the exclusive authority to operate and discharge from this facility arises under the permit conditions, requirements, terms, and provisions included herein. The Town of Kenansville is hereby authorized to: 1. Continue to operate an existing 0.30 MGD wastewater treatment system with the following components: • Dual manual bar screens • Dual grit troughs • Dual oxidation ditches with brush rotors • Dual secondary clarifiers • Gas chlorination • Gas dechlorination • Two sludge digesters • Sludge storage tank • Four sludge drying beds • Influent & effluent flow meters • Standby generator The facility is located north of Kenansville on Industrial Drive, off of NCSR 1301 in Duplin County. 2. Discharge from said treatment works at the location specified on the attached map into Grove Creek, currently classified C-Swamp waters in sub -basin 03-06-22 in the Cape Fear River Basin. Iufun ufnunstrUfr P.O. BOX 370,141 ROUTLEDGE ROAD, KENANSVILLE, N.C. 28349-0370 Telephone 910-296-0369 FAX 910-296-0707 www.kenansville.org Betty Long, Mayor Stephen M. Williamson, Jr., Mayor Pro Tem Allen Wood, Commissioner December 19, 2012 Mr. John Hennessy NC DENR/DWQ/Point Source Branch 1617 Mail Service Center Raleigh, NC 27699-1617 Dear Mr. Hennessy: Milta G. King, Commissioner Trevor Houston, Commissioner Nelson Baker, Commissioner Subject: Request for NPDES Modification NPDES Permit #NC0036668 Town of Kenansville WWTP Duplin County The Town of Kenansville is requesting a minor modification of NPDES permit number NC0036668 to add a treatment component back to the permit. During the most recent permit renewal in November 2011, one of the permit modifications removed a sludge digester from the permit. The Town would like to have the tank added to the permit as a sludge storage tank instead of a sludge digester. The WWTP has a permitted flow of 0.300 MGD with an average daily flow of approximately 0.180 MGD. The solids handling operations for the plant occurs at the "old" wastewater plant and consisted of two aerated tanks, the oxidation ditch and related appurtenances. In the NPDES permit, these three tanks were listed as Sludge Digesters. It is my understanding that during the renewal process there was some concern as to the ability of the oxidation ditch to function as a digester. The concern centered on the ability of the brush aeration system in the oxidation ditch to provide the needed aeration capacity for sludge digestion. It is the Town's intention to utilize the oxidation ditch as a sludge holding tank instead of a digester. In fact, this has been the operational strategy prior to the permit renewal. Waste activated sludge is pumped to the aerated sludge digesters. The sludge is aerated and decanted as needed. Once thickened, the sludge was transferred to the oxidation ditch for storage. When the sludge level in the oxidation ditch reached the brush aerator, the unit was Designated as: A Bicentennial Community, Governor's Award Town, National Historic District i Governor's Community of Excellence "Proud o Its Past; Pride in Its Future" j I D E C 9 2012 f I L started for mixing and aeration. Prior to a land application event, lime was introduced into the oxidation ditch to meet the vector attraction reduction requirements. Without the use of the oxidation ditch, the Town has lost the ability to store sludge over an extended length of time. The extra holding capacity allowed the WWTP to schedule land application events over a longer period of time, to hold the sludge as necessary during inclement weather conditions, to better accommodate the nutrient requirements of the land application sites, and to have less impacts on the operation of the WWTP. As the permit is now issued, lime stabilization of the sludge now has to take place in the aerated sludge digesters. Once stabilized, no additional sludge wasting can take place until the digesters are emptied. If the land application is able to take place as scheduled, there is no problem. But if for some reason, land application cannot take place, plant operation may be impacted until normal wasting can take place. The Town feels that the removal of the oxidation ditch as treatment component from the permit was mainly a matter of semantics. The oxidation ditch has previously been listed in the NPDES permit as a sludge digester although it was always operated as a sludge storage tank. The Town also feels that the loss of the oxidation ditch as sludge storage can have a negative impact on the operation of both the land application program and the operation of the WWTP. Again, we would request that the permit be modified to include the oxidation ditch as a sludge storage tank. If you have any questions or comments, please feel free to call me at: 910/296-0369. 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