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HISTORICALSUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE SOIL GAS <br />FOOTHILL SANITARY LANDFILL <br />Sample Type: Air SG -T <br />Sampling Date 2/19/04 516/04 7/22/04 11/15/04 2/11/05 10/3/05 6/30/06 11/29/06 3/13/07 <br />MonFtorina and Field Parameters <br />Methane Concentration fpe�t 0 0 2.1 0 0.4 0 4.2 23 <br />Carbon percent --NT NT NT --NT NT NT NT <br />Required <br />NT = Not Tested <br />. = Trace Concentration <br />{1} Parameter also detected in one or more quality control blanks. <br />SG -T; Printed: 7/20/2007 <br />15 of 15 <br />