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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> FOOTHILL SANITARY LANAFILL <br /> Units:mg/l,unless noted <br /> Sample Designation MW4 MW4 MW-4 MW-4 <br /> Sampling Date 7/23/07 2/5/08 7/30/08 1/15/09 <br /> Monitoring and Field Parameters <br /> General Water Quality Parameters <br /> Temperature(°C)(field) 23.5 11.6 20.1 19.6 <br /> Chloride 6.8 7.1 6.73 7.14 <br /> Nitrate-Nitrogen 1.6 1.7 1.66 1.5 <br /> Total Dissolved Solids 193 170 200 200 <br /> Sulfate 9.2 9.88 9.6 9.53 <br /> pH(std,units)(field) 7.61 8.24 7.61 7.85 <br /> Electrical Conductivity(umhos/cm)(field) 266 371 271.8 265.6 <br /> Turbidity(NTU)(field) 48.1 46.3 11.7 20.4 <br /> Calcium _ 21.6 22 21 22 <br /> Potassium _ 4.23 3.9 3.9 4.3 _ <br /> Magnesium _ 10.9 _ 11 11 11 _ - ----- <br /> Sodium 15 13 14 14 <br /> Volatile Organic Compounds NPAM <br /> 1,1,1,2-Tetrachloroethane NA NA 10.38 10.38 <br /> 1,1,1-Trichloroethane(TCA) NA NA <0.39 <0.46 <br /> 1,1,2,2-Tetrachloroethane NA NA <0.35 <0.35 <br /> 1,1,2-Trichloroethane NA NA <0.44 <0.44 <br /> 1,1,2-Trichlorctriflouroet1tane NA NA 10.61 10.78 <br /> 1,1-Dichlorcethane NA NA <0.37 <0.34 <br /> 1,1-Dichloroethene <0.39 <0.43 <0.43 <0.29 <br /> 1,1-Dichloropropene NA NA <0.38 <0.47 <br /> 1,2,3-Trichlorobenzene NA NA <0.37 <0.37 <br /> 1,2,3-Trichloropropane NA NA <0.43 <0.43 <br /> 1,2,4-Trichlorobenzene NA NA <0.36 <0.36 <br /> 1,2,4-Trimethylbenzme <0.23 <0.29 <0.33 <0.33 <br /> 1,2-Dibromo-3-chloropropane NA NA <0.69 <0.69 <br /> 1,2-Dibromoethane(EDB) NA NA <0.39 <0.39 <br /> 1,2-Dichlorobenzene NA NA <0.38 <0.38 <br /> 1,2-Dichloroethane(EDC) NA NA <0.38 <0.38 <br /> 1,2-Dichloropropane NA NA <0.35 <0.35 <br /> 1,3,5-Trimethylbenzene <0.20 <0.32 <0.39 <0.39 <br /> 1,3-Dichlorobenzene NA NA <0.37 <0.37 <br /> 1,3-Dichloropropane <0.12 <0.32 <0.37 <0.37 <br /> 114-Dichlorobenzene <0.14 <0.34 <0.38 <0.38 <br /> 2,2-Dichloropropane NA NA <0.39 <0.44 <br /> utanone(MEK) 10.92 12.0 12.0 <1.9 <br /> 2-Chlorotoluene NA NA <0.33 <0.33 <br /> 2-Hexanone NA NA <L8 <1.8 <br /> 4-Chlorotoluene NA NA <0.32 <0.32 <br /> 4-Isopropyltoluene NA NA <0.39 <0.39 <br /> 4-Methyl-2-pentanone(MIBK) NA NA 11.9 119 <br />