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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE SOIL GAS <br />FOOTHILL SANITARY LANDFILL <br />SG-12I <br />Sample Type: Air <br />Sampling Date 7/22/04 2/14/05 10/3/05 11/17/06 3/13/07 8/20/07 1/29/08 7/29/08 1/23/09 7/15/09 3/2/10 7/24/15 2/25/16 7/17/17 2/9/18 8/15/18 2/21/19 8/23/19 1/30/20 8/24/20 2/25/21 8/11/21 3/3/22 8/31/22 3/2/23 8/23/23 5/15/24 <br />Monitoring and Field Parameters <br />Methane Concentration (percent) 000000000NT0NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />Carbon Dioxide (percent) NTNTNTNT0.50.2 0 0 0 NT0.7NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />Oxygen (percent) NTNTNTNT20.820.320.619.720.1NT20.6NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />Volatile Organic Compounds PPB (v/v) <br />Freon 12 0.9<0.5<0.5<0.5NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />Freon 114 <0.5<0.5<0.5<0.5NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />Chloromethane <0.5<0.5<0.5<0.5NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />Vinyl Chloride <0.5 <0.5 <0.5 <0.5 NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />1,3-Butadiene NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />Bromomethane <0.5<0.5<0.5<0.5NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />Chloroethane 1<0.5<0.5<0.5NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />Freon 11 <0.5 <0.5 <0.5 <0.5 NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />Ethanol NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />Freon 113 <0.5<0.5<0.5<0.5NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />1,1-Dichloroethene <0.5<0.5<0.5<0.5NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />Acetone <0.5<0.5<0.5<0.5NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />2-Propanol NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />Carbon Disulfide <0.5<0.5<0.5<0.5NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />3-Chloropropene NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />Methylene Chloride <1.0<1.0281.3NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />Methyl tert-butyl ether NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />trans-1,2-Dichloroethene NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />Hexane <1.0 <1.0 <1.0 <1.0 NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />1,1-Dichloroethane <0.5<0.5<0.5<0.5NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />2-Butanone (Methyl Ethyl Ketone) NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />cis-1,2-Dichloroethene <0.5 <0.5 <0.5 <0.5 NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />Tetrahydrofuran <0.5<0.5<0.5<0.5NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />Chloroform <0.5 <0.5 <0.5 <0.5 NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />1,1,1-Trichloroethane 1.3 <0.5 <0.5 <0.5 NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />Cyclohexane <1.0<1.0<1.0<1.0NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />Carbon Tetrachloride <0.5<0.5<0.5<0.5NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />2,2,4-Trimethylpentane <1.0<1.0<1.0<1.0NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />Benzene <1.0<1.0<1.0<1.0NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />1,2-Dichloroethane <1.0<1.0<1.0<1.0NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />Heptane <1.0 <1.0 <1.0 <1.0 NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />Trichloroethene <1.0<1.0<1.0<1.0NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />1,2-Dichloropropane <0.5<0.5<0.5<0.5NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />1,4-Dioxane NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />Bromodichloromethane NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />cis-1,3-Dichloropropene <0.5 <0.5 <0.5 <0.5 NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />4-Methyl-2-pentanone NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />Toluene <0.526 42 33NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />trans-1,3-Dichloropropene <0.5 <0.5 <0.5 <0.5 NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />1,1,2-Trichloroethane <0.5<0.5<0.5<0.5NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />Tetrachloroethene (PCE) <0.5<0.5<0.52.1NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />2-Hexanone NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />Dibromochloromethane NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />1,2-Dibromoethane (EDB) <0.5<0.5<0.5<0.5NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />Chlorobenzene <0.5<0.5<0.5<0.5NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />Ethylbenzene <0.5<0.5<0.5<0.5NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />m/p Xylene <0.5<0.5<0.51.3NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />o-Xylene <0.5 <0.5 <0.5 <0.5 NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />Styrene <0.5 <0.5 <0.5 <0.5 NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />Bromoform NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />Cumene NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />1,1,2,2-Tetrachloroethane <0.5 <0.5 <0.5 <0.5 NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />Propylbenzene NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />4-Ethyltoluene NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />1,3,5-Trimethylbenzene <0.5<0.5<0.5<0.5NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />1,2,4-Trimethylbenzene <0.5<0.5<0.5<0.5NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />1,3-Dichlorobenzene <0.5 <0.5 <0.5 <0.5 NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />1,4-Dichlorobenzene <0.5 <0.5 <0.5 <0.5 NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />alpha-Chlorotoluene NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />1,2-Dichlorobenzene <0.5 <0.5 <0.5 <0.5 NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />1,2,4-Trichlorobenzene <1.0<1.0<1.0<1.0NTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNTNT <br />Hexachlorobutadiene <1.0 <1.0 <1.0 <1.0 NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />Benzyl Chloride <0.5 <0.5 <0.5 <0.5 NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br />NR = Not Required <br />NT = Not Tested <br /> J = Trace Concentration <br />{1} Parameter also detected in one or more quality control blanks. <br 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