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0 . 0 <br />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 7/29/11 <br />Monitoring and Field Parameters <br />Volatile Organic Compounds PPB (v/v) <br />Freon 12 440 420 1300 790 650 210 350 230 <br />Freon 114 130 180 370 230 180 75 110 81 <br />Chloromethane < .5 <8.8 <19 <12 <8.8 <47 <4. <4.8 <br />Bromomethane <br /><0.5 <br /><2.2 <br /><4.7 <br /><2.9 <br /><2.2 <br /><1.1 <br /><1.0 <br /><1.2 <br />oroet ane <br /><0. <br />< <br /><47 <br /><2, <br />< <br />< <br /><1,0 <br /><4. <br />Freon 11 <br />4.1 <br />2.3 <br />8.5 <br />4.7 <br />6.2 <br />1.4 <br />2.6 <br />1.7 <br />Ethanol <br /><4.6 <br /><8.8 <br /><19 <br /><12 <br /><8.8 <br />7.0 <br />8.0 <br />100 <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 /><1.2 <br />1- is oroet ene <br />7 <br />3 <br />2 <br />45 <br />9. <br /><1. <br /><1.0 <br />9.0 <br />Acetone <br /><0.5 <br />18 <br /><19 <br /><12 <br /><8.8 <br />9 <br /><4.1 <br /><4.8 <br />Carbon Disulfide <0.5 <2.2 <4.7 <2.9 <2.2 1.9 <1.0 <4.8 <br />NT <R R <19 <12 <8.8 <4.4 <4.1 <4.8 <br />Methylene Chloride <1.0 <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <I .Z <br />Methyl tert-but I ether NT <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <br />..--- 4 NT <9 9 <4-7 <2.9 <2.2 <1.1 <1.0 <1.2 <br />Hexane <1.0 6.4 14 7.1 2.2 <1.1 <1.0 7.z <br />-Dic loroet ane <0.5 <2.2 <4.7 <2.9 <2.2 <1. <1.0 <1.2 <br />1 -Trichloroethane <0.5 <2.2 <4.7 <2.9 <2.2 < <1.0 < <br />1.2 <br />Cyclohexane 3.5 10 14 8.3 <2.2 <1.1 <1.0 1.3 <br />