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NORTH CAROLINA DEPARTMENT <br /> OF ENVIRONMENT AND NATURAL RESOURCES <br /> DIVISION OF ENVIRONMENTAL HEALTH <br /> ON-SITE WASTEWATER SECTION <br /> INNOVATIVE WASTEWATER <br /> SYSTEM APPROVAL <br /> INNOVATIVE WASTEWATER SYSTEM NO: IWWS-97-1 <br /> ISSUED TO: Michael T.Hoover <br /> Professor and Extension Soils Specialist <br /> North Carolina State University <br /> Department of Soil Science,Sox 7619 <br /> Raleigh NC 27695-7619 <br /> FOR: Pressure Dosed Sand Filter Pretreatment Systems <br /> APPROVAL DATE:May 1, 1997 <br /> In accordance with 15A NCAC 18A.1969,a proposal by Michael T.Hoover,Department Soil Science,NCSU,for <br /> approval of subsurface wastewater systems utilizing pressure-dosed sand filters has been reviewed and modified and the <br /> system has been found to meet the standards of an innovative system when all of the following conditions are met: <br /> A. GENERAL <br /> 1. Scope of this.1969 Innovative System Approval <br /> a. Two treatment performance standards for advanced on-site pretreatment systems. <br /> b. Siting and sizing specifications for pressure-dosed sand filter pretreatment systems that meet <br /> these performance standards. <br /> C. Design and construction requirements for three types of pressure-dosed sand filter pretreatment <br /> systems that meet these standards. <br /> d. Operation,maintenance and monitoring requirements for pressure-dosed sand filter pretreatment <br /> systems that meet these performance standards. <br /> 2. This Innovative System Approval is applicable to wastewater systems utilizing pressure dosed sand filters that <br /> have a design..flow not exceeding 1000 gallons per day, and that treat domestic sewage only (non-industrial <br /> wastewater). Influent waste strength to the sand filter shall not exceed domestic quality septic tank effluent,with an <br /> average biochemical oxygen demand(SODS)less than 300 mg/1,total suspended solids(TSS) less than 200 mg/l, <br /> ammonium-nitrogen(NH3-N)less than 60 mg/l,and grease plus oil less than 30 mg/l. <br /> 1 <br /> 130 <br />