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® 4.4. Soil Availability <br /> Total future soil needs, including daily and intermediate cover (assume to represent 20% by <br /> volume of waste disposed, operations soil over future LCRS, and final cover, are estimated to <br /> be approximately 32.8 million CY (Tables 3 and 4). This estimate assumes continued use as <br /> soil for daily cover. <br /> The on-site sources of cover from excavation of the future modules are estimated to be <br /> approximately 49.1 million CY. These estimates indicate an abundance of soil cover, such that <br /> it is not anticipated that soil will be imported for daily, intermediate, or final cover under the <br /> present design scenario. <br /> Assuming a 20% soil by volume in refuse fill, the excess soil available (16.3 million CY) <br /> represents a potential additional 81 million CY of landfill capacity without importing soil. <br /> 4.5. Topography <br /> ® The predevelopment contours of the site show the slope of the site to be northwest to southeast <br /> (Figure 7). The present topography varies from approximately 220 to 360 mean sea level (MSL) <br /> (Figure 2). <br /> 4.6. Climatology <br /> 4.6.1 Isohyetal Map and Precipitation <br /> 1 <br /> i <br /> The isohyetal map for the region shows the rainfall in the vicinity of the landfill is <br /> approximately 17.5 inches per year (Figure 8). <br /> 4.6.2 Floodplain <br /> The waste management unit is not within a 100-year flood plain based on the <br /> Federal Emergency Management Agency's (FEMA) Flood Insurance Rate Map, <br /> Community - Panel Number 060299-0365A (Figure 9 and WDRs, Appendix A). The <br /> Foothill Sanitary Landfill Page 8 of 57 Public Works/Solid Waste <br /> Joint Technical Document County of San Joaquin—Revised 7/30/10 <br />