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Leachate is returned to the refuse of Module 1 in accordance with the WDRs either by direct <br /> pumping or by water truck applying leachate to the waste or travel surfaces within Module 1. <br /> 3.3.2.3. Engineering and Chemical Properties of Waste <br /> The engineering properties of municipal solids waste have been collected from literature. <br /> Physical properties include density, moisture content, particle size and distribution, field <br /> capacity, and porosity. Density varies because of the large variety of wastes, the degree of <br /> compaction, state of decomposition, and the amount of daily cover and total waste (Table 2). In <br /> general, uncompacted waste densities can vary between 110 pounds per cubic yard (cy) for <br /> plastic to 550 pounds per cy for ferrous metals. <br /> When waste is compacted, the Foothill Landfill currently estimates that they are obtaining a <br /> combined density of 800 pounds refuse per cy airspace consumed(refuse and soil cover). The <br /> County has an operating goal of effective densities to a minimum 880 pounds per cy. <br /> The chemical properties of wastes are important if evaluating recovery options, especially when <br /> burned for energy recovery. Typical values of solid waste parameters important to energy <br /> recovery (moisture, volatile matter, and ash) are shown in Table 2. The County is not <br /> considering a waste-to-energy project at this time. <br /> Foothill Sanitary Landfill Page 15 of 62 Public Works/Solid Waste <br /> JTD County of San Joaquin—Revised 10/6/05 <br />