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Volatile Organic Compounds PPB (v/v <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 HISTORICAL SUMMARY OF ANALYTICAL RESULTS <1.0 <1.0 <1.0 UNSATURATED ZONE SOIL GAS Acetone NT <0.5 FOOTHILL SANITARY LANDFILL <0.5 <0.5 <0.5 SG -5 Sample Type: Air <0.5 <0.5 7.7 Sampling Date 10/1/03 2/11/04 5/6/04 7/22/04 11/15/04 2/11/05 10/3/05 6/30/06 11/29/06 3/13/07 8/20/07 Monitoring and Field Parameters <0.5 <0.5 <0.5 Methane Concentration(percent) NR 0 0 0 0 0 0 0 0 0 0 xygen (percent) NT NT NT NT NT NT NT NT 17 19.8 12.4 Carbon Dioxide (percent) NT NT NT NT NT NT NT NT 0.7 1.1 2.1 Volatile Organic Compounds PPB (v/v <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 Acetone NT <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 7.7 Benzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 2.5 <0.5 <0.5 Benzyl Chloride <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 _ Bromomethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 2-butanone NT NT NT NT NT <0.5 <0.5 <0.5 <0.5 <0.5 10 n-butylbenzene NT NT NT NT NT <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 _ sec-butylbenzene NT NT NT NT NT <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 tert-butylbenzene NT NT NT NT NT <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 Carbon Disulfide NT NT NT NT NT <0.5 <0.5 <0.5 <0.5 1.8 1.8 Carbon Tetrachloride <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 Freon 113 NT NT NT NT NT <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 Hexachlorobutadiene <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 Hexane <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 _ _ Cyclohexane <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 _ Heptane <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 2,2,4-Trimethylpentane <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 NR = Not Required NT = Not Tested ' = Trace Concentration (1) Parameter also detected in one or more quality control blanks. SG -5; Printed: 1/31/2008 1 of 1