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Changes in depth of cut for pressure lines, necessitated by conflicting existing underground <br />utilities will not be a basis for additional compensation, but will be considered as incidental <br />work. Such changes shall not reduce the specified pipe cover. <br />All pressure conduit, including 3" and smaller, shall be buried a minimum of 36" below the <br />flowline of all creeks, and those creek crossings in dirt shall be backfilled for a depth of 4" below <br />and 6" above the top of the conduit with Class D concrete. Creek crossings in rock-bottom creeks <br />shall be backfilled to the flowline of the creek with Class D concrete. The concrete shall extend <br />20 feet past the edge of the creek. The concrete backfill shall not be paid for as a separate pay <br />item. <br />All gravity pipelines shall have the depth of bury specified in the detail drawings, and will be <br />concrete encased where specifically noted in the drawings, at no additional cost to the OWNER. <br />Provide support for vertical risers as commonly found at service connections, cleanouts, and <br />drop manholes to preclude vertical or lateral movement. Prevent the direct transfer of thrust due <br />to surface loads and settlement, and ensure adequate support at points of connection to main <br />lines. <br />When excavating for a service line connection, excavate material from above the top of the <br />existing pipe before removing rnaterial from the sides of the pipe. Materials and density of <br />service line ernbedment should conform to the specifications for the existing line, or with this <br />specification, whichever is more stringent. <br />Secure caps and plugs to the pipe to prevent movement and resulting leakage under test and <br />service pressures. <br />Use flexible water stops, resilient connectors, or other flexible systems approved by the <br />ENGINEER to make watertight connections to manholes and other structures. <br />Pipe shall be protected during handling against impact shock and free fall. No cracked or <br />damaged pipe or joint shall be installed in the line. Handle and store pipe and fittings in <br />accordance with recommendations of the manufacturer. <br />If faults, caverns, or subsidence are discovered during construction, all work will be halted and <br />the ENGINEER will be contacted to inspect. <br />TABLE I <br />EMBEDMENT MATERIAL REQUIREMENTS <br />Gravity Sewer Maias <br />Particle SizeLimitations <br />Sieve Size <br />% Passin <br />1 %2" <br />100 <br />#4 <br />90-100 <br />#200 <br />0-10 <br />Plasticily Index (P.I.) less than 12 <br />84 <br />