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(3) The granular backfill material shall be placed to the top ofthe trench of street subgrade elevation in level, successive layers, having a thickness of not greater than 12 inches. Each successive layer shall be thoroughly compacted as specified prior to the placement or additional layers. If the specified compaction is not being attained utilizing the equipment and materials available, the thickness of the layers shall be reduced. The addition of water to th~ backfill . materials , should be limited to achieving a satisfactory moisture content for compaction control, ifnecessary, Compaction of the backfill should be attained using vibratory, non-vibratory, or mechanical rammer-type compactors. The type of compactor is dependent on the type of backfill material used. Precautionary measures should be taken to assure that the compaction equipment will not damage the underlying pipe. (4) Backfilling shall not take place at any time unless approved compaction equipment is available at the site. ,,;;J ...;1 Ledge rock, boulders and large stones shall be removed to provide a cl~ance of at least six inches below outside barrel of the pipe, or fittings, and to a clear width of six inches on each side of all pipe and appurtenances for pipe 16 inches or less in diameter; for pipes larger than 16 inches, a clearance of 9 inches below and clear width of9 inches on each side of inside diameter of pipe shaU be provided. Adequate clearance for properly jointing pipe laid m rock trenches shall be provided at bell holes. , . ! Excavations below subgrade in rock or in boulders shall be refilled to subgrade with material approved by the ENGINEER or his representative and thoroughly compacted. .J Where trench excavation is encountered which is unsuitable for backfill, such material shall be replaced with granular backfill to be supplied by the CONTRACTOR at the direction of the ENGINEER. .j Where pipes are of sufficient size to create an excess of backfill material, the excess. shall be haufed to a location if directed by the ENGINEER and this location shall not be beyond the Roseville City limits. Hauling and grading of the excess backfill will be considered incidental to the project. ~ . . j 1 :1 J J Any deficiency in the quantity of material for backfilling the trenches or for filling depressions caused by settlement shall be supplied by the CONTRACTOR with no extra compensation allowed. Any settlement which occurs within one year after final acceptance shall be refilled by the CONTRACTOR with material supplied at the CONTRACTOR's expense and with material approved by the ENGINEER. Backfill in trenches on streets shall be placed to an elevation that will permit the placement of base material and surfacing material. . 600-5