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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE SOIL GAS <br />FOOTHILL SANITARY LANDFILL <br />SG -11 <br />Sample Type: Air <br />Sampling Date 1/29/08 7/29/08 1/22/09 7/15/09 3/2/10 9/3/10 1/25/11 <br />Monitoring and Field Parameters <br />Volatile Organic Compounds PPB (v/v) <br />Freon 12 <br />Freon 114 <br />440 <br />130 <br />420 <br />180 <br />1300 <br />370 <br />790 <br />230 <br />650 <br />180 <br />210 <br />75 <br />350 <br />110 <br />Chloromethane <br /><0.5 <br /><8.8 <br /><19 <br /><12 <br /><8.8 <br /><4.4 <br /><4.1 <br />Vinyl hloride <br /><0.5 <br />39 <br />120 <br />54 <br />3.1 <br /><1.1 <br /><1.0 <br />1,3 -Butadiene <br />NT <br /><2.2 <br /><4.7 <br /><2.9 <br /><2.2 <br /><1.1 <br /><1.0 <br />Bromomethane <br /><0.5 <br /><2.2 <br /><4.7 <br /><2.9 <br /><2.2 <br /><1.1 <br /><1.0 <br />hloroethane <br />Freon 11 <br /><0.5 <br />4.1 <br /><2.2 <br />2.3 <br /><4.7 <br />8.5 <br /><2.9 <br />4.7 <br /><2.2 <br />6.2 <br /><1.1 <br />1.4 <br /><1.0 <br />2.6 <br />Ethanol <br /><4.6 <br /><8.8 <br /><19 <br /><12 <br /><8.8 <br />7.0 <br />8.0 <br />Freon 113 <br /><0.5 <br /><2.2 <br /><4.7 <br /><2.9 <br /><2.2 <br /><1.1 <br /><1.0 <br />1,1-Dichloroethene <br />7 <br />30 <br />82 <br />45 <br />9.1 <br /><1.1 <br /><1.0 <br />Acetone <0.5 18 <19 <12 <8.8 9 <4.1 <br />2 -Propanol <4.6 <8.8 <19 <12 <8.8 <4.4 <4.1 <br />Carbon Disulfide <0.5 <2.2 <4.7 <2.9 <2.2 1.9 <1.0 <br />3-Chloropropene NT <8.8 <19 <12 <8.8 <4.4 <4.1 <br />Methylene Chloride <1.0 <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <br />Methyl tert-butyl ether NT <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <br />trans-1,2-Dichloroethene NT <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <br />Hexane <1.0 6.4 14 7.1 2.2 <1.1 <1.0 <br />1 1-ninhinma4 nna <n.s; <7 7 <d 7 <7 G <7 7 <1 1 <1,0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br />1,1,1 -Trichloroethane <0.5 <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <br />Cvclohexane 3.5 10 14 8.3 <2.2 <1.1 <1.0 <br />