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HISTORICAL SUMMM&OF ANALYTICAL RESULTS <br /> UNSATU ZONE SOIL GAS <br /> FOOTHILLINIMTARY LANDFILL <br /> SGA <br /> Sample Type:Air <br /> Sampling Date 10/1/03 2/11/04 5/6/04 7/21/04 11/15/04 2/11/05 <br /> Monitoring and Field Parameters <br /> Methane Concentration(percent) NR 0 0 0 0.2 0.1 <br /> Volatile Organic Compounds PPB(y/v) <br /> Benzene <0.5 <0.5 33 <0.5 17 33 <br /> Benzyl Chloride <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <br /> Bromomethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Carbon Tetrachloride <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Chlorobenzene <0.5 <0.5 <0.5 <0.5 13 <0.5 <br /> Chloroethane <0.5 5.8 205 <0.5 204 369 <br /> Chloroform <0.5 <0.5 1.5 <0.5 1.3 2.5 <br /> _ Chloromethane <0.5 2.7 49 <0.5 50 86 <br /> 1,2-Dibromoethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> 1,2-Dichlorobenzene <0.5 <0.5 <0.5 <0.5 1.0 <0.5 <br /> 1,3-Dichlorobenzene <0.5 <0.5 <0.5 <0.5 1.0 <0.5 <br /> 1,4-Dichlorobenzene <0.5 <0.5 <0.5 <0.5 1.1 <0.5 <br /> Dichlorodifluoromethane 173 18.4 39 307 269 380 <br /> 1,1-Dichloroethane <0.5 <0.5 6.3 <0.5 4.7 8.3 <br /> 1,2-Dichloroethane <0.5 <0.5 5.4 <0.5 5.2 8.7 <br /> 1,2-Dichloro-1,1,2,2-Tetrafluoroethane <0.5 1.4 12 27 24 28 <br /> 1,1-Dichloroethylene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> cis-1,2-Dichloroethene <0.5 <0.5 <0.5 <0.5 2.0 2 <br /> 1,2-Dichloropropane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> _cis-1,3-Dichloropropene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> trans-1,3-Dichloropropene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Ethylbenzene <0.5 <0.5 17 <0.5 18 31 <br /> Hexachlorobutadiene <1.0 <1.0 <1.0 <0.5 1.5 <1.0 <br /> Methene Chloride 308 1.6* 1.2 1.5 2.9 1.7 <br /> Styrene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> 1,1,2-Trichloro-1,2,2-Trifluoroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> 1,1,2,2-Tetrachloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Tetrachloroethene(PCE) <0.5 <0.5 3.3 4.9 2.3 2 <br /> Toluene 64703 1199 75564 221 6223 62703 <br /> 1,2,4-Trichlorobenzene <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <br /> 1,1,2-Trichloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> 1,1,1-Trichloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Trichloroethene <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <br /> Trichlorofluoromethane <0.5 <0.5 2.0 2.7 2.8 5.1 <br /> 1,3,5-Trimethylbenzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> 1,2,4-Trimethylbenzene 194 <0.5 1.8 <0.5 0.9 <0.5 <br /> Vinyl Chloride 316 22 764 1.1 662 796 <br /> m/p Xylene 224 <0.5 15 0.9 19 9.2 <br /> _ _ o-Xylene <0.5 <0.5 2.1 <0.5 2.5 3.4 <br /> NR=Not Required <br /> NT=Not Tested <br /> .=Trace Concentration <br /> {1) Parameter also detected in one or more quality control blanks. <br /> SG-1;Printed:7/21/2005 1 of 15 <br />