Trenches. a. Backfill for trenches shall be as specified for structures and as follows: (1) Complete promptly upon completion of pipe embedment and approval to proceed. (2) Use hand methods to a plane 12 inches above top of pipe. (3) Mechanical methods shall be acceptable where hand backfill is not required. (4) Backfill in lifts of thickness within compacting ability of equipment used, but not greater than 8 inches. (5) Until compacted depth over conduit exceeds 3 ft., do not drop fill material over 5 ft. Distance may then be increased 2 ft. for each additional ft. of cover.
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Sources: License Agreement, License Agreement, License Agreement