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40 <br />40 <br />W (earth) (density of soil*) (depth of cover in feet) <br />(O.D. in feet) <br />maximum 120 lbs/cubic ft above maximum water table <br />i <br />elevation and 60 lbs/cubic Et below maximum water table <br />r <br />elevation. <br />D. <br />Bolts and nuts for restrained joints shall he hot dipped galvanized, low <br />alloy, high strength steel. <br />E. <br />The Contractor shall also provide restrained joints in accordance with the <br />above criteria wherever thrust blocks are used in conjunction with below <br />ground fittings on lines 12 inches in diameter or less. <br />1.02 EARTHWORK AND BACKFILL <br />A. <br />All excavation for utilities and/or house connections shall be adequately <br />guarded with barricades and lights, so as to protect the public from hazard. <br />Streets, sidewalks, driveways, curbs, parkways, and other public property <br />disturbed in the course of the work shall be restored in a manner <br />satisfactory to the County and City. <br />B. <br />Foundation material used for pipe bedding, from a minimum 6 inch <br />distance below the pipe invert to the bottom 12 inches above the top of the <br />pipe, shall be bank run sand and gravel. <br />C. <br />All gravity sewer installation procedures must be in accordance with pipe <br />manufacturer's recommendations. All gravity sewers and force mains <br />shall be installed to have minimum cover of 36 inches. 'Installation of <br />gravity sewers shall be controlled by use of a laser to maintain proper <br />grade. <br />D. <br />Installation of force mains shall be in accordance with AWWA Standard <br />C600 and the installation specifications for water lines in the water <br />distribution section, irrespective of the type of pipe selected. <br />I . Trench —Trench width shall be kept to a minimum necessary grade <br />for installation of tate pipe. The trench bottom slrr.il be graded <br />uniformly to match the slope of the pipe. <br />2. Backfill — Only good quality backfill, free of stones, roots, rocks, <br />broken cement, or other material which might be damaging to the <br />pipe shall be used. Backfill shall be placed in the trench in <br />uniform lifts of 12 inches. <br />02610-2 <br />