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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE SOIL GAS <br />FOOTHILL SANITARY LANDFILL <br />SG -4 <br />Sample Type: Air <br />Sampling Date 8/20/07 1/29/08 7/29/08 1/22/09 7/15/09 3/2/10 9/3/10 1/25/11 7/29/11 4/12/12 8/7/12 <br />Monitoring and Field Parameters <br />Volatile Organic Compounds PPB (v/v) <br />Freon 12 <br />Freon 114 <br />81 <br />12 <br />11 <br />2.1 <br />22 <br />6.7 <br />600 <br />130 <br />100 <br />18 <br />26 <br />4.8 <br />21 <br />3.3 <br />25 <br />5.6 <br />31 <br />5.9 <br />180 <br />35 <br />44 <br />7.6 <br />Chloromethane <br /><0.5 <br /><0.5 <br /><4.8 <br /><8.1 <br /><4.6 <br /><4.7 <br /><4.8 <br /><4.8 <br /><4.3 <br />< <br /><3.2 <br />Vinyl Chloride <br /><0.5 <br /><0.5 <br /><1.2 <br />120 <br /><1. <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.1 <br /><0.69 <br /><0.79 <br />1,3 -Butadiene <br />NT <br />NT <br /><1.2 <br /><2.0 <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.1 <br /><0.69 <br /><0.79 <br />Bromomethane <br /><0.5 <br /><0.5 <br /><1.2 <br /><2.0 <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.1 <br /><6.9 <br /><7.9 <br />Chloroethane <br /><0.5 <br /><0.5 <br /><1.2 <br /><2.0 <br /><1.2 <br /><1. <br /><1.2 <br /><1. <br /><4.3 <br /><2.8 <br /><3.2 <br />Freon 11 <br />Ethanol <br />Freon 113 <br />1,1-Dichloroethene <br />29 <br />NT <br />1.8 <br /><0.5 <br />4.4 <br />NT <br /><0.5 <br /><0.5 <br />19 <br />5.3 <br /><1.2 <br /><1.2 <br />170 <br /><8.1 <br />18 <br />3.1 <br />39 <br /><4.6 <br />2.3 <br /><1.2 <br />15 <br /><4.7 <br />1.2 <br /><1.2 <br />8.4 <br /><4.8 <br /><1.2 <br /><1.2 <br />9.2 <br />9.6 <br /><1.2 <br /><1.2 <br />9.9 <br />85 <br /><1.1 <br /><1.1 <br />56 <br /><2.8 <br />4.6 <br /><0.69 <br />15 <br /><3.2 <br /><0.79 <br /><0.79 <br />Acetone <br />6.8 <br />8 <br />50 <br />12 <br /><4.6 <br />6.4 <br />6.6 <br />5.3 <br />4.2* <br /><6.9 <br /><7.9 <br />2 -Propanol <br />NT <br />NT <br /><4.8 <br /><8.1 <br /><4.6 <br /><4.7 <br /><4.8 <br /><4.8 <br /><4.3 <br /><2.8 <br /><3.2 <br />Carbon Disulfide <br /><0.5 <br /><0.5 <br /><1.2 <br /><2.0 <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />5.0 <br /><2.8 <br /><3.2 <br />3-Chloropropene <br />NT <br />NT <br /><4.8 <br /><8.1 <br /><4.6 <br /><4.7 <br /><4.8 <br /><4.8 <br /><4.3 <br /><2.8 <br /><3.2 <br />Methylene Chloride <br /><1.0 <br /><1.0 <br /><1.2 <br /><2.0 <br /><1.2 <br /><1.2 <br /><1.2 <br />2.0 <br /><1.1 <br /><6.9 <br /><7.9 <br />Methyl tert-butyl ether <br />trans- 1,2-Dichloroethene <br />NT <br />NT <br />NT <br />NT <br /><1.2 <br /><1.2 <br /><2.0 <br /><2.0 <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.1 <br /><1.1 <br /><0.69 <br /><0.69 <br /><0.79 <br /><0.79 <br />Hexane <br /><1.0 <br /><1.0 <br /><1.2 <br />32 <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.1 <br /><0.69 <br /><0.79 <br />171- is oroethane <br /><0.5 <br /><0.5 <br /><1.2 <br /><2.0 <br /><1.2 <br /><1.2 <br /><1.2 <br /><1. <br /><1.1 <br /><0.69 <br />7� <br />2-Butanone (Methyl Ethyl Ketone) <br />8.8 <br />4.8 <br />4.5 <br /><2.0 <br /><1.2 <br /><1.2 <br />1.7 <br /><1.2 <br /><4.3 <br /><2.8 <br /><3.2 <br />cis -1,2-D- ichTOroethene <br /><0.5 <br /><0.5 <br /><1. <br /><2. <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br /><1. <br /><0.69 <br /><0.79 <br />Tetra y ro uran <br /><0.5 <br />72 <br /><1.2 <br /><2.0 <br /><1.2 <br /><1.2 <br /><1.2 <br /><1-T <br /><1.1 <br /><0.69 <br />< <br />Chloroform <br /><0.5 <br /><0.5 <br /><1.2 <br /><2. 0 <br /><1.2 <br /><1. <br /><1.2 <br /><1.2 <br /><1.1 <br />1.6 <br />1.6 <br />1.1.1- ric oroet ane <br />< .5 <br /><0.5 <br />< <br /><2.0 <br /><1.2 <br />< <br /><1.2 <br /><1.2 <br /><1.1 <br /><0.69 <br /><0.79 <br />