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Volatile Organic Commends PPB (v/v) Acetone r mm it r m ■s mm mm rr r <0.5 <0.5 <0.5 HISTORICAL SUMMARY OF ANALYTICAL RESULTS <0.5 <0.5 <0.5 UNSATURATED ZONE SOIL GAS Benzene <0.5 0.8 FOOTHILL SANITARY LANDFILL <0.5 <0.5 <0.5 SG -3 Sample Type: Air 2.4 <0.5 <0.5 ---- Sampling Date 10/1/03 2/11/04 5/6/04 7/22/04 11/15/04 2/14/05 10/3/05 6/30/06 11/29/06 3/13/07 8/20/07 Monitoring and Field Parameters <10 <1.0 <1.0 Methane Concentration (percent) NR 0 0 0 0 0 0 0 0 0 0 Oxygen (percent) NT NT NT NT NT NT NT NT 14.2 15.4 14.3 Carbon Dioxide (percent) NT NT NT NT NT NT NT NT 4.7 4.5 4.3 Volatile Organic Commends PPB (v/v) Acetone NT <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 Benzene <0.5 0.8 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 2.4 <0.5 <0.5 ---- Benzyl Chloride 1.4' <1.0 <1.0 <10 <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 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 4.2 _ n-butylbenzene NT NT NT <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 sec-butylbenzene NT NT NT <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 tert-butylbenzene NT NT NT <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 Carbon Disulfide NT NT NT <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 Carbon Tetrachloride <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 Hexachlorobutadiene 1.4" <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 Cvclghexane <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 Heotane <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 -3; Printed: 1/31/2008 1 of 1