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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 /> Monitoring and Field Parameters <br /> General Water Ouality Parameters <br /> Temperature(°C)(field) 21.5 14.8 20.8 18.3 21.1 <br /> Chloride 6 6.1 5.8 5.65 5.64 <br /> Nitrate-Nitrogen 2.9 3 2.8 2.88 2.84 <br /> Total Dissolved Solids 206 170 73 l50 130 <br /> Sulfate 5 5 4.9 4.84 4.91 <br /> pH(std.units)(field) 7.14 7.37 7.18 7.26 7.11 <br /> Electrical Conductivity(umhos/cm)(field) 358 393 219 391 368.9 <br /> Turbidity(NTU)(field) 12.6 13.9 11.64 39.7 9.3 <br /> Calcium 22.8 18 19 18 19 <br /> Potassium 11.2 9.6 3.1 2.8 3.0 <br /> Magnesium 3.5 3.1 9.9 9.9 11.0 <br /> Sodium 12.9 13.0 11.0 10.0 11.0 <br /> Volatile Organic Compounds(ug/D <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-Trichlorotriflouroethane NA NA NA NA <0.61 <br /> 1,1-Dichloroethane NA NA NA NA <0.37 <br /> 1,1-Dichloroethene <0.39 <0.39 <0.39 <0.43 <0.43 <br /> 1,1-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-chloroptnpane NA NA NA NA <0.69 <br /> 1,2-Dibroinoethane(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-Dichioropropane NA NA NA NA <0.39 <br /> 2-Butanone(MEK) <0.92 <0.92 <0.92 <2.0 <2.0 <br /> 2-Chlorotoluene 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 <1.9 4.6* 7.5* <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 /> Chlombenzene <0.16 <0.16 <0.16 <0.36 <0.39 <br /> Chloro4thane,. < <0.2 <0.2 <0.38 <0.38 <br /> a mca'mg'tdatayshares'�-eeW i*prv479k791289\F'fFfliMxiR <br />