Specifications include, but are not limited to: Furnish all labor, materials, equipment and incidentals required and perform all trenching for installation of pipelines and appurtenances, including dewatering, filling, backfilling, disposal of surplus material, disposal of water removed from the trench, and restoration of trench surfaces and easements. Excavation shall extend to the width and depth shown on the Drawings or as specified herein and shall provide suitable room for installing pipe, structures and appurtenances. The CONTRACTOR shall be responsible for adequacy of the sheeting, bracing, and shoring system, and design of the systems. Furnish and place all sheeting, bracing and supports and remove from the excavation all materials which the ENGINEER may deem unsuitable for backfilling. The bottom of the excavation shall be firm, dry and in all respects, acceptable. Deposit crushed stone for pipe bedding, or crushed stone for excavation below grade, directly on the bottom of the trench immediately after excavation has reached the proper depth and before the bottom of the trench has become softened or disturbed by any cause. The length of open trench shall be related closely to the rate of pipe laying. All excavation, trenching and related sheeting, bracing, etc. shall comply at a minimum with the requirements ofOSHA excavation safety standards(29 CFR Part 1926.650 Subpart P) and local or State requirements. Where conflict between OSHA and State or local regulations exists, the more stringent requirements shall apply.