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0 2.3.2.4 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 capacity, <br />and porosity. Density varies because of the large variety of wastes, the degree of compaction, <br />state of decomposition, and the amount of daily cover and total waste. In general, uncompacted <br />waste densities can vary between 110 pounds per cubic yard (cy) for plastic to 550 pounds per cy <br />for ferrous metals. <br />NCRC&SL refuse placement density calculations indicate that approximately 1000 pounds of <br />refuse is placed in the landfill for each cubic yard airspace consumed by refuse and cover. The <br />density of refuse placed between March 2008 and March 2009 was approximately 1200 Ib/cy. <br />The chemical properties of wastes are important if evaluating recovery options, especially when <br />burned for energy recovery. The typical proximate values (moisture, volatile matter, and ash) as <br />well as densities are shown in Table 3. <br />North County RC&SL Page 11 of 69 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin — February 10, 2010 <br />