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Corral Hollow Sanitary Landfill <br /> Postclosure Maintenance Plan <br /> Revised January, 1994 <br /> permeability layer is not damaged, the vegetative cover <br /> will be re-placed and additional soil will be placed if <br /> needed. eeeer-s to the vegetative layer-- The area will be <br /> re-graded, re-seeded, and watered to establish new <br /> vegetation. <br /> 2. If damage occurs to the low permeability layer, the <br /> engineer will have the proper amount of clay trucked to <br /> the site. If the area is small enough, pure clay may be <br /> used. The area will be re-compacted to 95% relative <br /> compaction and lab tested for permeability. If the area <br /> meets permeability requirements, it will be covered with <br /> vegetative material and re-seeded. <br /> The following activities will be performed during the postclosure <br /> period to monitor topography and predict settlement: <br /> 1. Maintaining two permanent monuments. <br /> 2 . Every five years, commencing upon completion of <br /> closure activities: <br /> A. Perform an aerial survey of the site. <br /> B. Provide a topographic map with a maximum <br /> contour interval- of two feet. <br /> C. Provide an iso-settlement map showing the change in <br /> 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 /> Differential settlement will be calculated upon completion of each <br /> aerial survey. The data from the aerial survey will be input into <br /> SDR Map Computer Software. The Map program is capable of comparing <br /> two surfaces, drawing contours from survey data, and calculating <br /> volumes between surfaces. Therefore, each time a survey is <br /> performed, it can be compared to the surface from the previous <br /> survey, and areas of differential settlement can be pinpointed. In <br /> addition, the volume can be calculated between two surfaces, so the <br /> amount of soil needed to repair areas of differential settlement <br /> can be determined. <br /> 5.2 Drainage <br /> The drainage system will be inspected to make sure it is directing <br /> runoff water into perimeter ditches to protect the integrity of the <br /> final cover. Drain ditches and facilities will be regraded or <br /> 8 <br />