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M M ® r M ® ® M ® M ® ® ® ® ® i <br /> HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> SG-7 <br /> Sample Type:Air <br /> Sampling Date 8/7/12 1/28/13 9/11/13 3/18/14 <br /> Toluene <1.7 <2.4 <1.0 <2.9 <br /> trans-1,3-Dichloropropene <1.7 <2.4 <1.0 <2.9 <br /> 1,1,2-Trichloroethane <1.7 <2.4 <1.0 <2.9 <br /> Tetrachloroethene(PCE) <1.7 <2.4 <1.0 <2.9 <br /> 2-Hexanone <6.7 <9.6 <4.2 <11 <br /> Dibromochloromethane <1.7 <2.4 <1.0 <2.9 <br /> 1,2-Dibromoethane(EDB) <1.7 <2.4 <1.0 <2.9 <br /> Chlorobenzene <1.7 <2.4 <1.0 <2.9 <br /> Ethylbenzene <1.7 <2.4 <1.0 <2.9 <br /> m/p Xylene 2.3 <2.4 <1.0 <2.9 <br /> o-Xylene <1.7 <2.4 <1.0 <2.9 <br /> Styrene <1.7 <2.4 <1.0 <2.9 <br /> Bromoform <1.7 <2.4 <1.0 <2.9 <br /> Cumene <1.7 <2.4 <1.0 <2.9 <br /> 1,1,2,2-Tetrachloroethane <1.7 <2.4 <1.0 <2.9 <br /> Propylbenzene <1.7 <2.4 <1.0 <2.9 <br /> 4-Ethyltoluene <1.7 <2.4 <1.0 <2.9 <br /> 1,3,5-Trimethylbenzene <1.7 <2.4 <1.0 <2.9 <br /> 1,2,4-Trimethylbenzene <1.7 <2.4 <1.0 <2.9 <br /> 1,3-Dichlorobenzene <1.7 <2.4 <1.0 <2.9 <br /> 1,4-Dichlorobenzene <1.7 <2.4 <1.0 <2.9 <br /> alpha-Chlorotoluene <1.7 <2.4 <1.0 <2.9 <br /> 1,2-Dichlorobenzene <1.7 <2.4 <1.0 <2.9 <br /> 1,2,4-Trichlorobenzene <6.7 9.6 <4.2 <11 <br /> Hexachlorobutadiene <6.7 9.6 <4.2 <11 <br /> Benzyl Chloride NT NT NT NT <br /> n-butylbenzene NT NT NT NT <br /> sec-butylbenzene NT NT NT NT <br /> tert-b utyl benzene NT NT NT NT <br /> NR=Not Required <br /> NT=Not Tested <br /> *=Trace Concentration <br /> (1} Parameter also detected in one or more quality control blanks. <br /> E= Exceeds instrument calibration range. <br />