1989-10-10_REVISION - M1988112 (16)

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8.3 Tailings Delivery Pioeline • The tailings delivery system extends from the millsite to the disposal area perimeter and interior, and includes pipelines, valves, connecting feeder pipes and by-pass or end discharge points, pipe support blocks, thrust blocks, and other miscellaneous items as shown on the Drawings. Pipeline materials shall be as specified herein, while other materials associated with the tailings delivery system shall be furnished as necessary. The tailings delivery pipelines shall be HDPE Dri~scopipe 8600, or approved equivalent HDPE pipe with a standard dimension ratio (SDR) of 15.5. Pipe alignments and diameters are as shown on the Drawings. Pipe joints shall be butt fusion welded end to end in the field. The butt fusion method shall be performed in strict conformance with the pipe manufacturer's recommendations using approved equipment. HDPE flanged ends shall be installed for connecting to valves and feeder pipe discharge points, as directed • 1 by. the Owner. The discharge point feeder pipe shall be four-inch diameter HDPE Schedule 80 with a rubber connection to the main pipeline for clamp pinch valve shutoff. 8.4 Water Return Pioeline and Pond Outlet Pioe The water return pipeline covered by this Specification is from the collection pond to the tailings pond. Pipeline alignments are shown on the Drawings. The pipe shall consist of HDPE pipe sized to accommodate the maximum flow rate and pressures to be produced in the pipeline. 8.5 Leachate Detection Pioe The Leachate detection pipe shall consist of Schedule 80 • unslotted eight-inch diameter PVC pipe with the bmttom section 40