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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> FOOTHILL SANITARY LANAFILL <br /> Units:mg/l,unless noted <br /> Sample Designation MW-4 MW-4 MW-4 <br /> Sampling Date 7/23/07 2/5/08 7/30/08 <br /> Monitorine and Field Parameters <br /> General Water Ouality Parameters <br /> Temperature(°C)(field) 23.5 11.6 20.1 <br /> Chloride _ _ 6.8 7.1 6.73 <br /> Nitrate-Nitrogen 1.6 1.7 1.66 <br /> Total Dissolved Solids _ 193 170 200 <br /> Sulfate 9.88 9.6 <br /> pH(std.units)(field) 9.2_ _ _ 9.2 8.24 9.6 <br /> Electrical Conductivity(umbos/cm)(field) 266 371 271.8 <br /> Turbidity(NTU)(field) 48.1 46.3 11.7 <br /> Calcium 21.6 22 21 <br /> Potassium 423 3.9 3.9 <br /> Magnesium _10.9 11 11 - <br /> Sodium IS 13 14 <br /> Volatile Organic Compounds(ugA) <br /> 1,1,1,2-Tetrachloroethane NA NA <0.38 <br /> 1,1,1-Trichlor0ethane(TCA) NA NA <0.39 <br /> 1,1,2,2-Tetrachloroethane NA NA <0.35 <br /> 1,1,2-Trichloroethane NA NA <0.44 <br /> 1,1,2-Trichlorotriflouroethane NA NA <0.61 <br /> 1,1-Dichlomethane NA NA <0.37 <br /> 1,1-Dichlomethene <0.39 <0.43 <0.43 - <br /> 1,1-Dichloropropene NA NA <0.38 ---_-- <br /> 1,2,3-Trichlorobenzene NA NA <0.37 <br /> 1,2,3-Trichloropropane NA NA <0.43 <br /> 1,2,4-Trichlorobenzene NA NA <0.36 <br /> 1,2,4-Trimethylbenzene <0.23 <0.29 <0.33 <br /> 1,2-Dibromo-3-chloropropane NA NA <0.69 <br /> 1,2-Dibromoethane(EDB) NA NA <0.39 <br /> 1,2-Dichlorobenzene NA NA <0.38 <br /> 1,2-Dichloroethane(EDC) NA NA <0.38 <br /> 1,2-Dichloropropene _ NA NA <0.35 <br /> 1,3,5-Trimethylbenzene <0.20 <0.32 <0.39 <br /> 1,3-DichlorobenzeneNA NA <0.37 <br /> 1,3-Dichloropropane <0.12 <0.32 <0.37 <br /> 1,4-Dichlorobenzene <0.14 <0.34 <0.38 <br /> 2,2-Dichloropropane NA NA <0.39 <br /> 2-Butanone(MEK) <0.92 <2.0 Q.0 <br /> 2-Chlorotoluene NA NA <0.33 <br /> 2-Hexanone NA NA <1.8 <br /> 4-Chlorotoluene NA NA <0.32 <br /> 4-Isopropyltoluene NA NA <0.39 <br /> 4-Methyl-2-pentanone(MIBK) NA NA <1.9 <br />