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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> Units:mg/1,unless noted FOOTHILL SANITARY LANDFILL <br /> Sample Designation MW-5 MW-5 MW-5 MW-5 <br /> Sampling Date 7/23/07 4/1/08 7/30/08 1/15/09 <br /> Monitoring and Field Parameters <br /> General Water Quality Parameters <br /> Temperature(°C)(field) 24.9 19.9 21.7 18.5 <br /> Chloride 8.8 8.72 8.54 9.01 <br /> Nitrate-Nitrogen 1.6 1.71 1.69 1.8 <br /> Total Dissolved Solids 184 160 200 220 <br /> Sulfate 9.9 9.93 9.99 10.93 <br /> pH(std.units)(field) 7.76 7.58 6.91 7.87 <br /> Elechical Conductivity(umhos/cm)(field) 258 258.8 250.8 259.6 <br /> Turbidity(NTU)(field) 29.7 12.9 10.3 11.7 <br /> Calcium 21.1 22 20 21 <br /> Potassium 3.68 3.6 3.6 3.7 - <br /> Magnesium 10.6 11 11 11 --- <br /> Sodium 14.8 14 14 13 <br /> Volatile Organic Compounds(u/1) <br /> _1,1,1,2-Tetrachloroethane NA NA <0.38 <0.38 <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-Trichlorotriflouroethane NA NA <0.61 <0.78 <br /> 1,1-Dichloroethane 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-Tiichlorobenzene 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-Trimethylbenzene <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 /> 1,4-Dichlorobenzene <0.14 <0.34 <0.38 <0.38 <br /> 2,2-Dichloropropane NA NA <0.39 <0.44 - <br /> 2-Butanone(MEK)-_ <0.92 Q.0 <2,0 <1.9 -- <br /> _2-Chlorotoluene NA NA <0.33 <0.33 <br /> _2-Hexanone NA NA <I.8 <1.8 - <br /> _4-Chlorotoluene NA NA <0.32 <0.32 <br /> _4-Isopropyltoluene NA NA <0.39 <039 <br /> _4-Methyl-2-pentanone(MIBK) NA NA 4.9 4.9 <br />