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11 <br />C <br />Estimation of site life is based on the following: <br />• Useable airspace available as of March 2009, including capacity due to the increase in <br />landfill height to 320 ft elevation <br />• Approximate average disposal rate of increase of 3% per year from the 2009 disposal <br />rate. <br />• Average refuse density of 1000 pounds per cy (1000 Ib refuse disposed per cy airspace <br />consumed by refuse, daily and intermediate cover). <br />3.4 SOIL AVAILABILITY <br />Future total daily and intermediate cover needs as of March 2009, based on the waste quantities <br />above, are estimated to be approximately 8 million cy (Table 1 in Appendix B). This is based on <br />the approximation that daily and intermediate cover needs are 20% by volume of in-place waste, <br />plus construction of perimeter drainage facilities. This soil is available from on-site excavation. <br />Imported soil is not used at this time, and is not anticipated to be needed. <br />North County RC&SL <br />Joint Technical Document <br />Page 13 of 69 Public Works/Solid Waste <br />County of San Joaquin — February 10, 2010 <br />