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Foothill Sanitary Landfill Preliminary Closure Plan <br /> Revision #1 May 6, 1994 <br /> Settlement will be monitored by taking the following steps: <br /> 1. Installing two permanent monuments. <br /> 2 . Every five years, commencing upon completion of <br /> closure activities, the following 3 tasks shall be <br /> done. <br /> A. Perform an aerial survey of the site upon <br /> completion of closure activities. <br /> B. Provide a topographic map with a maximum contour <br /> interval of two feet. <br /> C. Provide an iso-settlement map showing the change <br /> in elevation from the map produced at the time of <br /> closure and the most recent topographic map with a <br /> maximum contour interval of two feet. <br /> FINAL SITE FACE <br /> Final landfill slopes will be vegetated with appropriate drought <br /> resistant grass as each module is filled and covered to help <br /> stabilize slopes and reduce erosion. Grass planting will reduce <br /> the maintenance necessary to control erosion. The rooting depth <br /> of the grass will not exceed the thickness of the vegetative <br /> cover layer so the clay layer will not be disturbed. Also, final <br /> cover slopes will be 3% to 6%. The maximum side slopes will be <br /> 3 : 1 which will reduce high velocity overland flow. <br /> DRAINAGE CONTROL <br /> The permanent drainage facilities within the landfill will have <br /> the capacity to carry peak flow from a 100 year occurrence storm. <br /> Surface runoff within the landfill will be carried to natural <br /> drainage- swales by perimeter ditches. Run-on from adjacent areas <br /> will be controlled by constructing perimeter berms to direct <br /> water away from active disposal areas. <br /> when necessary, silt fences will be constructed parallel to the <br /> drainage ditches and swales to control sediment at the source. <br /> Also, if necessary, straw-bale dikes could be constructed along <br /> the downgradient silt fences to limit downgradient flow of <br /> sediment-laden water. <br /> is <br />