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100 <br />go' <br />KI <br />7C <br />ow <br />P: 2 <br />65 � 6( <br />00 <br />> <br />0 m 5C <br />G < 4( <br />3( <br />91 <br />11 <br />LANDFILL GAS COMPOSITION VS. TIME <br />DECOMPOSITION PHASES <br />IV <br />`55%....... .............................. <br />TIME AFTER PLACEMENT <br />DECOMPOSITION PHASES <br />I AEROBIC <br />11 ANAEROBIC, NON-METHANOGENIC <br />ill ANAEROBIC, METHANOGENIC, UNSTEADY <br />!V ANAEROBIC, METHANOGENIC, STEADY <br />