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r OEM <br />M <br />M <br />� M ® MM <br />® W r W m m <br />m <br />HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE SOIL GAS <br />FOOTHILL SANITARY LANDFILL <br />SG -7 <br />Sample Type: Air <br />Sampling Date 10/1/03 <br />2/11/04 <br />5/7/04 7/22/04 11/15/04 2/14/05 10/3/05 6/30/06 11/29/06 3/13/07 8/20/07 <br />Monitoring and Field Parameters <br />_ Methane oncentration ercent) <br />en ( ercent <br />NR <br />NT <br />0 <br />NT <br />0 <br />NT <br />0 0 0 0 0 0 <br />NT NT NT NT NT 15.5 <br />0 <br />20 <br />0 ___ ----- <br />20 _ -_ -.-- -- <br />arbon Dioxide (percent) <br />NT <br />NT <br />NT <br />NT NT NT NT NT 0.4 <br />0.8 <br />0.3 ____ ----- <br />Volatile Organic Compounds PPB (v/v) <br />- <br />- - <br />Acetone <br />NT <br /><0.5 <br /><0.5 <br /><0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br />5.5 <br />13 <br />Benzene <br /><0.5 <br />0.90 <br /><0.5 <br /><0.5 <0.5 <0.5 <0.5 1.4 2.1 <br /><1.0 <1.0 <1.0 <br /><0.5 <br /><1.0 <br /><0.5 - <br /><1.0 <br />Benz I hioride <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <1.0 <1.0 <br />Bromomethane <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /><0.5 <br /><0.5 <br />2-butanone <br />NT <br />NT <br />NT <br />NT NT <0.5 <0.5 <0.5 <br />NT NT NT NT NT <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br />sec-but(benene e <br />nzene NT NT NT NT NT <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br />Carbon Disulfide NT NT NT NT NT <0.5<0.5 <0.5 <0.5 <0.5 <br /><n s <n 5 < 5, <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 -0.5 <br />Cyclohexane <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <br />He tane <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0- <br />_ n <4 n '10 <1 n <1 n <1 0 <1.0 <1.0 <1.0 <1.0 -- <br />NR = Not Required <br />NT = Not Tested <br />= Trace Concentration <br />(1) Parameter also detected in one or more quality control blanks. <br />1 of 1 <br />SG -7; Printed: 1/31/2008 <br />