1997-304 - Laserfiche WebLink

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311, the runoff from the tributary area resulting from the design storm having a 10 year recurrence interval with an upstream water depth of 15 inches. End sections shall be furnished and installed on both the inlet and outlet of each culvert. Stone riprap shall be installed as required to control erosion. b. Pipe, fittings, couplings, and accessories shall be handled in a manner that will ensure installation in sound, undamaged condition. Equipment, tools, and methods used in unloading, reloading, hauling, and laying shall be such that the pipe, fittings, couplings and accessories are not damaged. The Contractor shall repair any damaged pipe coating before installing the pipe. c. Where culvert pipe is to be laid on existing ground and on or under fill, the Contractor shall construct the embankment to a height of at least 9 inches, but not mom than 3 feet above top of pipe and then excavate a trench to receive the pipe. Trench shall be no wider than necessary to permit proper tampling of embedment around the pipe. d. The interior of all pipe, fittings, and couplings shall be thoroughly cleaned of all foreign matter before being installed. Before jointing, all joint surfaces shall be wire brushed if necessary, wiped clean, and kept clean until jointing is completed. e. Each run of corrugated metal pipe shall be laid to grade. Sections of the corrugated metal pipe shall be joined using metal coupling bands, centered on the joint, and with the pipe sections as close together as possible. Each coupling band shall be bolted in place and tightened sufficiently to ensure a tight joint and to form a continuous conduit capable of resisting all stresses. f. Culverts shall be maintained to ensure full flow capacity at all times. Temporary culverts no longer required for operation of the landfill shall be removed and the grassed drainage way restored. If in sound condition, removed pipes may be reused for construction of temporary culverts. 2.3-4 bp$SN14.Ie.97