2011-08-30_REVISION - M1977215 (2)

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B. Any work found unsatisfactory or any work disturbed by subsequent operations before acceptance is granted shall be corrected by Contractor as directed by the Project Manager at no additional cost to Rio Grande Silver. PART2 PRODUCTS 2.1 WATER TRUCK DELIVERY PIPES A. All pipe for the Water Truck Delivery Pipes shall be HDPE SDR32.5 pipe DriscoplexTM 1700 manufactured by CP Chem, or approved equivalent meeting ASTM D 1248 and D 2239 requirements. The resin, pipe, and fittings will comply with the following industry standards: Pipe Standard, ASTM F 714; Fittings Standard, ASTM D 3261; Cell Classification, ASTM 3350, PE345434C. B. All valves and fittings shall be stainless steel, rated to a minimum pressure of 50 psi as approved by the Project Manager and /or the Design Engineer. 2.2 EVAPORATION POND DIFFUSER A. A pre- fabricated HDPE diffuser shall be installed at the evaporation pond as indicated on the Drawings. PART 3 EXECUTION 3.1 GENERAL A. Contractor shall install pipe according to Manufacturer's recommendations. B. Contractor shall take all precautions necessary to not damage the pipe during material placement. Contractor may periodically be requested by the Project Manager to verify that covered pipe has not been crushed. Costs associated with proving pipes that have not been crushed shall be borne by Contractor. C. Piping shall be placed to the lines and elevations shown on the Drawings, with no sags or humps, as approved by the Project Manager and Design Engineer. 3.2 PIPE CONNECTIONS A. All connections for non - perforated pipe shall be watertight under maximum anticipated pressure head. B. The ends of all pipes shall be capped with a manufactured pipe cap. C. HDPE pipe will be butt- heat - fusion welded in accordance with the Manufacturer's guidelines. Rio Grande Silver Tailings Evaporation Pond 02610 -2 HDPE Pipe and Fittings August 2011 02610