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characteristics which inhibit leachate production and ultimate <br /> impairment of the groundwater from the landfill. Some of these <br /> characteristics are: <br /> (1) The average annual rainfall at the site is only <br /> approximately 8 inches. <br /> (2) Low permeability (less than 1 X 10-6 cm./sec. ) soil exists <br /> in the unsaturated zone beneath the site <br /> (3) The difference in elevation of groundwater in the regional <br /> aquifer beneath the site and the lowest elevation of <br /> existing landfilled refuse is approximately 200 to 220 feet. <br /> (4) The water balance calculation for the site, which is <br /> contained in Table 3 of the Closure Plan, indicates that <br /> precipitation should not infiltrate the refuse with <br /> placement of final cover. <br /> 31 <br />