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M MM mm m ■r ® m m m m M MM MM t! <br />HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE AIR <br />NORTH COUNTY SANITARY LANDFILL <br />SG -6 <br />Sample Type: Air <br />Sampling Date 9/29/03 2111/04 5/7/04 7/22/04 11/9/04 2/10/05 9/30105 <br />Monttoring and Field Parameters <br />Methane one entration percent .4 50.3 <br />Volatile Organic Compounds PPB Cv v) <br />Benzene 5. 357 107 364 368 <br />Nol Required <br />NT = Not Tested <br />= Trace Concentration <br />{1I Parameter also detected in one or more quality control blanks. <br />SG -6: Printed: 1/25/2006 12 of 17 <br />