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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> FOOTHILL SANITARY LANAFH.L <br /> Units:mg/1,unless noted <br /> Sample Designation MW-3 MW-3 MW-3 MW-3 MW-3 <br /> Sampling Date 7/27/06 1/31/07 7/23/07 2/6/08 7/31/08 <br /> Monitoring and Field Parameters <br /> General Water Ouality Parameters <br /> Temperature(°C)(field) 21.5 16.8 21.2 17.7 21.7 <br /> Chloride 10 11 9.6 9.58 9.21 <br /> Nitrate-Nitrogen 3 6 2.9 2.87 2.61 <br /> Total Dissolved Solids 229 180 200 140 130 <br /> Sulfate 6 6.3 6 6.41 6.04 <br /> pH(std.units)(field) 7.14 7.34 7.22 7.32 7.26 <br /> Electrical Conductivity(umhos/cm)(field) 341 358 258 378 254.9 <br /> Turbidity(NT(I)(field) 12.7 11.8 11.3 11.3 7.7 <br /> Calcium 25.6 21 22 16 20 <br /> Potassium 13.1 11 3.5 3.3 3.4 <br /> Magnesium 3.8 5.3 11 8.1 12 <br /> Sodium 17.9 18 16 12 15 <br /> Volatile Oreanic Compounds(ugn) <br /> _1,1,1,2-Tetrachloroethane NA NA NA NA <0.38 <br /> _1,1,1-Trichloroethane(TCA) NA NA NA NA <0.39 <br /> _1,1,2,2-Tetrachloroethane NA NA NA NA <0.35 <br /> _1,1,2-Trichloroethane NA NA NA NA <0.44 <br /> _1,1,2-Trichlorotritlouroethane NA NA NA NA <0.61 <br /> I,I-Dichloroethane NA NA NA NA <0.37 <br /> 1,1-Dichloroethene <0.39 <0.39 <0.39 <0.43 <0.43 <br /> _I,I-Dichloropropene NA NA NA NA <0.38 <br /> _1,2,3-Trichlorobenzene NA NA NA NA <0.37 <br /> _1,2,3-Trichloropropane NA NA NA NA <0.43 <br /> 1,2,4-Trichlorobenzene NA NA NA NA <0.36 <br /> 1,2,4-Trimethylbenzene <0.23 <0.23 <0.23 <0.29 <0.33 <br /> _1,2-Dibromo-3-chloropropane NA NA NA NA <0.69 <br /> _1,2-Dibromoethane(EDB) NA NA NA NA <0.39 <br /> _1,2-Dichlorobenzene NA NA NA NA <0.38 <br /> _1,2-Dichloroethane(EDC) NA NA NA NA <0.38 <br /> 1,2-Dichloropropane NA NA NA NA <0.35 <br /> 1,3,5-Trimethylbenzene <0.20 <0.20 <0.20 <0.32 <0.39 <br /> 1,3-Dichlorobenzene NA NA NA NA <0.37 <br /> 1,3-Dichloropropane <0.12 <0.12 <0.12 <0.32 <0.37 <br /> 1,4-Dichlorobenzene <0.14 <0.14 <0.14 <0.34 <0.38 <br /> 2,2-Dichloropropane NA NA NA NA <0.39 <br /> 2-Butanone(MEK) <0.92 <0.92 <0.92 <2.0 <2.0 <br /> _2-Cblorotoluene NA NA NA NA <0.33 <br /> _2-Hexanone NA NA NA NA <1.8 <br /> _4-Chlorotoluene NA NA NA NA <0.32 <br /> _4-Isopropyltoluene NA NA NA NA <0.39 <br /> 4-Methyl-2-pentanone(MIBK) NA NA NA NA <1.9 <br /> Acetone <1.8 6* 6.6* <2.7 <3.0 <br /> Acrolein NA NA NA NA <4.5 <br /> Acrylonitrile NA NA NA NA <0.89 <br /> Benzene <0.17 <0.17 <0.17 <0.30 <0.33 <br /> Bromobenzene NA NA NA NA <0.38 <br /> _Bromochloromethane NA NA NA NA <0.37 <br /> Bromodichloromethane NA NA NA NA <0.30 <br /> Bromoform NA NA NA NA <0.31 <br /> Bromomethane NA NA NA NA <0.40 <br /> Carbon disulfide <0.23 <0.23 <0.23 <0.86 <0.86 <br /> Carbon Tetrachloride NA NA NA NA <0.46 <br /> Chlorobenzene <0.16 <0.16 <0.16 <0.36 <0.39 <br /> Chloro e < :<�,23 <0.23 <0.38 <0.38 <br />