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Engineers and Soil Scientists <br />Agri -Waste Technology, Inc. <br />5400 Etta Burke Court, Suite 200 <br />Raleigh, NC 27606 <br />919.859.0669 <br />www.agriwaste.com <br />Mr. Jim Hutcherson <br />Orange County Housing, Human Rights, and Community Development <br />P.O. Box 8181 <br />Hillsborough, NC 27278 <br />RE: Proposal for Engineering Services - REVISED <br />Dear Mr. Hutcherson, <br />October 28, 2011 <br />Thank you for contacting Agri -Waste Technology, Inc. (AWT) regarding the residence at <br />1318 Ford Road in Orange County. From our discussions, I understand that a National <br />Pollutant Discharge Elimination System ( NPDES) permit has been recommended to <br />replace the failed sub - surface system currently serving this residence. AWT would <br />appreciate the opportunity to assist you with this project. We maintain the credentials to <br />complete the required application, have completed several NPDES projects in Orange <br />County and maintain a positive relationship with the applicable regulatory agencies. <br />The State of North Carolina, Department of Natural Resources (DENR) maintains a <br />General NPDES Permit (NCG550000) that provides coverage for Single Family <br />Residences (SFR) discharging domestic wastewater. For the residence in question, we <br />would propose to develop the required application and engineered design to request a <br />Certificate of Coverage (COC) and an Authorization to Construct (ATC) the system. <br />Following review by DENR, the residence will be issued a unique permit number <br />(NCG55XXXX) under the General Permit. For your review, I have included a copy of <br />the General Permit with this proposal. <br />The current General Permit allows for buried, single pass sand filters or a re- circulating <br />sand filter to be used to treat the wastewater from the residence. Prior to final discharge, <br />the treated wastewater must also be disinfected with either chlorination tablets (and de- <br />chlorination tablets) or with an ultraviolet (UV) light system. With the size of the land <br />parcel and from an operational standpoint, we would recommend a re- circulating sand <br />filter system with UV disinfection. Additionally, we would design the system to <br />minimize the nitrogen content of the discharged wastewater (enhanced nitrogen removal). <br />