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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 commercial applications. Preventers shall <br /> be University of Southern California (USC) approved as per the Approved <br /> Manufacturer's Product List. <br /> 11.08 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 /> Drawings Detail M-5 & M-6. <br /> 11.09 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 or brass double strap as per the <br /> Approved Manufacturer's Product List. <br /> 11.10 FLEXIBLE COUPLINGS <br /> A. Flexible couplings shall be either the split type or the sleeve type. <br /> 1. Split type coupling shall be used with all interior piping and <br /> with exterior piping as noted. The couplings shall be <br /> mechanical type for radius groove piping. The couplings <br /> 14W shall mechanically engage and lock grooved pipe ends in a <br /> 11 -4 <br />