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The pipe to be used shall be (HDPE) pressure pipe conforming to the requirement of AW WA C-906 of a 160 psi working pressure. The grade used shall be resistant to aggressive soils or corrosive substances present. Unless otherwise specified, the dimensions and tolerances of the pipe barrel should conform to ductile iron pipe equivalent outside diameters. The dimension ratio (DR) shall be 11. 7. Fittings for all types of pipe shall be ductile iron, have a minimum working pressure rating of 150 psi and shall conform to the requirement of AW WA C153 (ANSI 21.53) Ductile Iron Compact Fittings, unless otherwise approved by the City Engineer. 8. Water service pipe requirements shall conform to the requirements of ASTM B 88 for Seamless Copper Water Tube, Type K, Soft Annealed temper. 9. Valve boxes shall be ductile iron, buffalo -type adjustable. Valve boxes shall be provided for 7.5 feet of cover, except where greater depths are indicated on the profiles of the Drawings. 10. Valve boxes shall be at least 3 pieces with sufficient adjustment to provide at least 6 inches of adjustment above and below grade. Adjustments for depths greater than 6 inches shall be incidental and no payment made therefore. All valve boxes should have a built in connection point for tracer wire. Tracer wire shall: Conform to the applicable requirements of NEMA WC3, WC5, WC7. Shall be Underwriters Laboratories (UL) listed for use in direct burial applications (E.G. USE, UF, or tracer wire). Conductor: Minimum No. 10 AWG—Copper Clad Steel Tracer Wire rated to 30 volts Outside Identification: Volts (V), AWG size, UL and designation (ex. "tracer wire"). Magnetized Tracer Boxes: Snake Pit Magnetized Tracer Box, www.copperheadwire.com, or approved equal. Valve box stabilizers manufactured by Adaptor Inc., or approved equal, shall be installed on all gate valves. 11. Curb stop and box shall be for copper service pipe inlet and outlet and boxes shall be approved extension service boxes of a uniform make. Inside diameter of upper section shall be standard for curb stop with which it is to be used. 12. Curb stops shall be Mueller MK 11 H-15150, oriseal curb valves, or equal. All threads shall conform to the requirements of AWWA C800.