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undermining and erosion. The uniform section mat and riprap used as an apron to the <br />inlets may require periodic repair. The inlet area must be kept free of debris, soil <br />buildup, or grass clippings, which will tend to accumulate at these locations. <br />The surface of the landfill cap should be inspected at least on a quarterly basis to ensure <br />that the pipes remain covered with at least two feet of soil, and that the pipes have not <br />shifted. It is very important to pipe integrity that the pipe bedding soils remain intact. <br />A perimeter ditch terminal structure is located at the bottom of each letdown (except <br />the infill segment letdown pipes). These structures should be inspected on a monthly <br />basis in conjunction with normal landfill maintenance. The outfall structure apron <br />should be inspected for undermining and erosion. The FDOT energy dissipation <br />structure has a sump behind the baffle which should be inspected and cleaned as <br />needed. Due to the large velocities of the stormwater, only large rock or debris should <br />settle in the sump. <br />The existing stormwater management system needs to be maintained to assure efficient <br />renewal of runoff from solid waste deposition and operation/activity areas. Best <br />management practices (BMPs) and maintenance procedures are described below. <br />$tormwater Best Management Practices <br />The basis for any stormwater O&M plan is the implementation of accepted and proven <br />BMPs. BMPs are defined as a schedule of activities, prohibition of practices, <br />maintenance procedures, and other management practices to prevent the pollution of <br />surface and groundwater. BMPs also include treatment requirements, operating <br />procedures, and procedures to prevent site runoff, spillage or leaks, waste or sludge <br />F-32 <br />F <br />• <br />• <br />