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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> FOOTHILL SANITARY LANDFILL <br /> Units:mg/l,unless noted <br /> Sample Designation MW-1 MW-1 MW-1 MW-1 MW-1 <br /> Sampling Date 7/27/06 1/31/07 7/23/07 2/5/08 7/31/08 <br /> Chloroform <0.20 <0.20 <0.20 <0.33 <0.33 <br /> Chloromethane <0.25 <0.25 <0.25 <0.41 <0.41 <br /> cis-1,2-Dict loroethene NA NA NA NA <0.36 <br /> cis-1,3-Dichloropropene NA NA NA NA <0.30 <br /> Dibromochloromethane NA NA NA NA <0.32 <br /> Dibromomethane NA NA NA NA <0.38 <br /> Dichlorodifluoromethane NA NA NA NA <0.68 <br /> Ethylbenzene NA NA NA NA <0.43 <br /> Hexachlorobutadiene NA NA NA NA <0.65 <br /> Iodomethane NA NA NA NA <0.83 <br /> Isoproplybenzene NA NA NA NA <0.39 <br /> m/p-Xylene NA NA NA NA NA <br /> Total Xylenes NA NA NA NA <l.l <br /> Methyl tert-Butyl Ether <0.32 <0.32 <0.32 <0.70 <0.72 <br /> Methylene Chloride <0.48 <0.48 <0.48 <0.30 <0.30 <br /> n-Butylbenzene NA NA NA NA <0.38 <br /> n-Propylbenzene NA NA NA NA <0.33 <br /> Napthalene <0.24 <0.24 <0.24 <0.29 <0.36 <br /> sec-Butylbenzene NA NA NA NA <0.40 <br /> Styrene NA NA NA NA <0.32 <br /> tert-Butylbenzene NA NA NA NA <0.35 <br /> Tetrachloroethene(PCE) <0.19 <0.19 <0.19 <0.40 <0.49 <br /> Toluene <0.22 <0.22 <0.22 <0.32 <0.40 <br /> trans-1,2-Dichloroethene NA NA NA NA <0.41 <br /> trans-1,3-Dichloropropene NA NA NA NA <0.35 <br /> trans-1,4-Dichloro-2-butene NA NA NA NA <1.3 <br /> Trichloroethene(TCE) <0.13 <0.13 <0.13 <0.31 <0.38 <br /> Trichlorofluoromethane NA NA NA NA <0.59 <br /> Vinyl Acetate NA NA NA NA <0.85 <br /> Vinyl Chloride NA NA NA NA <0.47 <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds (EPA Method 3520/8270) <br /> All Compounds NA NA NA NA NA <br /> Organochlorine Pesticides and Polychlorinated Biohenyl's <br /> (EPA Method 3510/8080) <br /> All Compounds NA NA NA NA NA <br /> °=Trace Concentration <br /> (1)This analytical result appears to be anomalous and therefore was not used in statistical evaluation procedures. <br /> (I)Parameter also detected in one or more quality control blanks <br /> NA=Not Available <br /> n:\consulting\data\shared\projects\xls\qmr\79\791289\FH-Hist.xls <br /> ® ® M M ® <br />