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Sample Type: Air <br />Sampling Date <br />7/22/04 <br />mmmmmmm <br />HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE SOIL GAS <br />FOOTHILL SANITARY LANDFILL <br />SG -121 <br />2/14/05 10/3/05 11/17/06 3/13/07 8/20/07 <br />Monitoring and Field Parameters <br />Methane Concentration (percent) <br />0 <br />0 <br />0 <br />0 <br />0 0 <br />Oxygen (percent) <br />NT <br />NT <br />NT <br />NT <br />20.8 20.3 <br />Carbon Dioxide (percent) <br />NT <br />NT <br />NT <br />NT <br />0.5 0.2 <br />Volatile Organic Compounds PPB N/v) <br />Acetone <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br />NT NT <br />Benzene <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br />NT NT <br />Benzyl Chloride <br /><0.5 <br /><0.5 <br /><0.5 <br />-<-O-.-5----NT- <br />NT <br />Bromomethane <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br />NT NT <br />Carbon Disulfide <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br />NT NT <br />Carbon Tetrachloride <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br />NT NT <br />Etnylbenzene <0.5 <0.5 <0.5 <0.5 NT NT <br />Freon 113 <0.5 <0.5 <0.5 <0.5 NT NT <br />NR = Not Required <br />NT = Not Tested <br />* = Trace Concentration <br />{1) Parameter also detected in one or more quality control blanks. <br />SG -121; Printed: 1/31/2008 1 of 1 <br />