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California" (Closure Plan). This report was prepared by EMCON <br />Associates for San Joaquin County and was approved by the RWQCB on <br />June 21, 1488 and is contained as Appendix B of this RWD. <br />The composition of typical municipal refuse is shown on Figure 11. <br />The greatest component of the waste, organic compounds, is comprised <br />mainly of foodstuffs, paper products and garden waste. Decomposition <br />of these organic wastes will take place by microbial action. <br />The decomposition process of foodstuffs is shown on Figure 24'. <br />Decomposition of materials containing cellulose is shown on Figure <br />Inorganic materials present are composed mainly inly of inert materials and <br />metals. Inert materials will remain relatively unchanged while metals <br />will undergo chemical reaction and oxidation. Ferrous metals will <br />ultimately be completely oxidized, while other metals such as aluminum <br />and copper will undergo chemical reaction and be protected from <br />further oxidation by the development ofi rotective ox <br />p des' . <br />The major factors which control decomposition of waste in a landfill <br />are oxygen, temperature, moisture and the composition of the waste. <br />During the relatively early active life of a landfill, the composition <br />of landfill gas undergoes an evolutionaryrocs <br />process where the waste <br />experiences first aerobic, and then anaerobic environments. The <br />changes in gas composition can be characterized by the four phases <br />shown in Figure 4 (which is Figure 4 taken from EMCON Associates'). As <br />5 <br />