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loo <br />I I Ii I III i IV <br />90 <br />a <br />so <br />I <br />lv <br />'o <br />E <br />soOfI <br />♦ I <br />I I <br />so <br />.......�. ....� <br />i <br />'o <br />I v <br />20 <br />.+c <br />io <br />• <br />o <br />o <br />0 <br />y <br />0 <br />loo <br />I I Ii I III i IV <br />90 <br />so <br />I <br />'o <br />I <br />soOfI <br />♦ I <br />I I <br />so <br />.......�. ....� <br />i <br />'o <br />I v <br />20 <br />®I ® ®r®® H <br />io <br />• <br />L100000 <br />I <br />1 <br />► <br />Y <br />i <br />i <br />I <br />i <br />i <br />t <br />i <br />TIME AFTER PLACEMENT <br />(n®t 14) <br />I. Aerobic <br />11.' Anaerobic, Non-Methanogenic <br />III. Anaerobic, Methano9enic, Unsteady <br />IV. Anaerobic, Methanogenic, Steady <br />-Ewon <br />Associates <br />1490 W1 Circle <br />oq dpe. CNI1erel® goal <br />Figure 4. Evolution of typical landfill gas composition. <br />Source: Methane Generation and Recovery From Landfills., By EMCON Associates,'1982 <br />