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9 . 07 BACKFLOW PREVENTERS <br /> All backflow preventers shall be mounted aboveground , in non -traffic <br /> areas on the customer's side of the meter. Aboveground piping shall be <br /> ductile iron . Brass or Copper pipe may be used for pipe 2" in diameter or <br /> smaller. Backflow preventers shall be of reduced pressure/double check <br /> type with two (2 ) independently operating check valves , and shall be <br /> designed to operate in a horizontal flow mode . An independent relief <br /> valve shall be located between the two check valves . Reduced pressure <br /> feature shall be included in all commerical applications . Preventers shall <br /> be University of Southern California ( USC) approved as per the Approved <br /> Manufacturer's Product List. <br /> 9 . 08 VALVE BOXES <br /> A. All buried valves shall have cast iron two or three-piece valve <br /> boxes with cast iron covers . Valve boxes shall be provided with <br /> suitable heavy bonnets and extend to match finished grade <br /> surface as directed by the Engineer. The barrel shall be one or <br /> two-piece , screw type , having 5 '/" shaft. Covers shall have <br /> 'WATER" cast into the top for all water mains , "SEWER" cast into <br /> the top for all wastewater force mains and " REUSE" cast into the <br /> top for all reuse mains All valves shall have actuating nuts <br /> extended to within 24 inches of the top of the valve box cover. <br /> B . Valve boxes shall be provided with concrete base and valve <br /> nameplate , with suitable anchors for casting in concrete . <br /> Nameplate shall be 3" diameter bronze disk with engraved <br /> lettering 1 /8" deep , as shown on the Drawings and manufactured <br /> per the Approved Manufacturer's Product List, <br /> C . Valve boxes shall be installed in a concrete pad , as specified in <br /> Drawing Detail M-5 . IRCDUS may eliminate concrete pad in <br /> asphalt pavement. <br /> 9 . 09 CORPORATION STOPS <br /> A. Corporation stops for connections to ductile iron or P .V . C . piping <br /> shall be all brass or bronze suitable for 150 psi operating pressure , <br /> shall be iron pipe or AWWA tapered thread design , shall be as per the <br /> Approved Manufacturer's Product List, and shall be of sizes required <br /> and/or noted on the Drawings . <br /> B . Saddles shall be stainless steel double strap with epoxy coated iron <br /> saddle as per the Approved Manufacturer's Product List. <br /> 9 - 4 <br />