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Be Foundation material used for pipe bedding , from a minimum 6-inch distance <br /> below the pipe invert to the bottom 12- inches above the top of the pipe , shall be <br /> bank run sand and gravel . <br /> C . All gravity sewer installation procedures must be in accordance with pipe <br /> manufacturer's recommendations . All gravity sewers and force mains shall be <br /> installed to have a minimum depth of 36-inches . Installation of gravity sewers <br /> shall be controlled by use of a laser to maintain proper grade . A maximum <br /> tolerance of %° dip will be accepted in gravity sewer construction . A 2-inch wide <br /> magnetic I . D . tape shall be placed continuously in the trench over all pipes , 12,, <br /> inches below grade . <br /> 1 . Trench — Trench width shall be kept to a minimum necessary for <br /> installation of the pipe and shall comply with current OSHA requirements . <br /> The trench bottom shall be graded uniformly to match the slope of the pipe . <br /> 2 . Backfill — Only good quality backfill ; free of stones , hardpan materials , <br /> roots , rocks , broken cement or other debris that might be damaging to the <br /> pipe shall be used . Backfill shall be placed in the trench in uniform lifts of <br /> 12-inches . <br /> 3 . Compaction — All fill must be compacted by hand tamping from under the <br /> pipe us to the center line . Backfill shall be compacted in lifts up to the <br /> surface to achieve a minimum compaction of 98% of maximum density in <br /> roadways , shoulders , and easements, in accordance with AASHTO <br /> Specifications T- 180 and ASTM D-2167 , <br /> 4 . Dewatering — Construction shall be accomplished in a dry trench . Well <br /> pointing may be required as necessary. All water entering excavations or <br /> other parts of the work shall be contained , collected and pumped to <br /> suitable places for disposal , as permitted by local and state regulation . <br /> 5 . Sheeting — Sheeting and shoring shall be installed as may be necessary <br /> for the protection of the work , preservation of adjacent property and <br /> structures and the safety of employees . Sheeting and backing shall be <br /> uniform to OSHA requirements. <br /> D . Installation of force mains (sewer or reused water) shall be in accordance with <br /> latest AWWA Standard Specifications C- 600 and the installation specifications <br /> for water lines in the Water Distribution Section , irrespective of the type of pipe <br /> selected . A 2-inch wide magnetic I . D . tape and tracer wire shall be placed <br /> continuously in the trench over all pipes per Detail M- 14 , 12-inches below grade . <br /> 1 . Trench — Trench width shall be kept to a minimum necessary for pipe <br /> installation and shall comply with current OSHA requirements . The trench <br /> bottom shall be graded and alignment shall be parallel with roadway , <br /> where possible . <br /> 11 - 5 <br />