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for pipe lines shall be completed before the pipe is installed unless <br /> otherwise permitted by the Engineer. <br /> 4. All excavation shall be by open cut unless otherwise authorized by <br /> the Engineer. If the bottom of the excavation is found to consist of <br /> rock or any materials that cannot be excavated to give a uniform <br /> bearing surface, the material shall be removed to a depth at least 6" <br /> below established bottom grade and backfilled to grade with suitable <br /> bedding material thoroughly compacted in place. Any excavations <br /> carried below the depths indicated, without specific directions, shall <br /> be backfilled in the same manner. The excavation shall be of <br /> sufficient width to allow a clearance of not less than 6" between the <br /> side of the trench and the outside of the pipe, or in case of pipe with <br /> a bell, the outside of the bell of the pipe. This rule will apply at all <br /> times, and consequently, proper allowance must be made for <br /> additional space required for sheeting the trench where necessary. <br /> 5. Sheeting Bracing. Trenches, and Trench Boxes: If necessary, the <br /> , <br /> Contractor will be required to keep the sides of the excavation <br /> vertical by sheeting and/or bracing or the use of a trench box to <br /> prevent movement by slides or settling of the sides of the trench, to <br /> prevent injury or displacement of the pipe or appurtenances or <br /> diminish the working space required at the sides of the pipe. Also, <br /> the Contractor may be required for the purpose of preventing injury <br /> to persons or property or adjacent structures in place or to be <br /> constructed, to leave sheeting and bracing in place. <br /> 6. No sheeting or bracing shall extend closer than 2'-0" off the ground <br /> surface, or within subgrade, and no timbers shall be left in the trench <br /> that may form pockets or cavities that cannot easily be filled during <br /> the operation of backfilling and settling or compacting the trench <br /> backfill. It is understood that the Owner will be under no obligation <br /> to pay for sheeting or bracing left in place by the Contractor. Failure <br /> to sheet and brace trenches or other excavation shall be the <br /> Contractors risk, and he will be held responsible for caving, <br /> settlement, and all other damage resulting therefrom. <br /> 7. Excavated materials to be used for backfill will be approved by the <br /> Engineer, and if acceptable shall be neatly deposited at the sides of <br /> the trenches where space is available. Where stockpiling of <br /> excavated material is required, the Contractor shall so maintain his <br /> operations as to provide for natural drainage and not present an <br /> unsightly appearance. <br /> B. Installing Valves and Appurtenances: <br /> Rev. 10122/01 PROJECT#13.01126 02640-Page 10 <br />