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3-19 <br />• A trench will be dug across the channel. The trench will be approximately twice as long as <br />the channel is wide and at least three feet below the bottom of the channel. The slab of <br />concrete will be placed on its edge in the trench bottom and will be backfilled so that the top <br />edge of the slab will be even with the bottom of the channel. After backfilling tfie slab, the <br />channel will be reformed and the rip-rap will be replaced over the top of the slab.. This method <br />will prevent water from cutting down through the channel bottom or diverting around the rip-rap <br />while vegetation along the channel is developing. The method of placement will also allow the <br />solid concrete excavated from foundations and sidewalks to be beneficially utilized in the <br />reclamation of the project rather than being broken up and disposed. <br />fF channel errosion is evident after initial reclamation, other methods my be'utilized in <br />eliminate errosion. These methods may include the use of gabions, temporary fabric fences or <br />• similar devices. <br />Sedimentation ponds and temporary diversion structures will be backfilled, reclaimed and <br />abandoned as required. The hydrological balance of the permit area will be returned to a state <br />very closely resembling that prior to effecting the area. <br /> <br />M~ Volume 1 4-2996 <br />