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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-5 MW-5 <br /> Sampling Date 7/23/07 4/1/08 <br /> Monitoring and Field Parameters <br /> General Water Ouality Parameters <br /> Temperature(°C)(field) 24.9 19.9 - -- <br /> ---- <br /> Chloride 8.8 8.72 <br /> Nitrate-Nitrogen 1.6 1.71 <br /> Total Dissolved Solids 184 160 <br /> Sulfate 9.9 9.93 <br /> H(std.units)(field) 7.76 7.58 <br /> Electrical Conductivity(umhos/cm)(field) 258 258.8 <br /> Turbidity(NTU)(field) 29.7 12.9 <br /> Calcium 21.1 22 <br /> Potassium 3.68 3.6 <br /> Magnesium 10.611 <br /> -----__._ - ._.. _- ---------- ---_--_ _----._-. -- <br /> Sodium 14.8 14 <br /> Volatile Organic Compounds(ug/l) <br /> Trichloroethene(TCE) <0.13 <0.31 <br /> 1,1-Dichloroethene <0.39 <0.43 -- - - <br /> Chloroform_ <0.20 <0.33 <br /> Benzene <0.17 <0.30 <br /> m/p-Xylene --.. .-- NR NR <br /> Chlorobenzene <0.16 <036 <br /> MethyleneChloride <0.48 <0.30 -- <br /> Acetone <I.8 <ZJ --- <br /> Napthalene <0.24 <0.29 - -- <br /> Methyl ter-butyl ether <br /> Toluene --_.. - <0.22 v ------ <br /> 1,4-Dichlorobenzene <0.14 <0.34 -__- <br /> Tetrachloroethene <0.19 <0.40 <br /> 2-Butanone ---__ ---- <0.92 Q.0 <br /> 1,3-Dichloropropane - <0.12 <0.32 ---- <br /> Chloromethane <0.25 <0.41 <br /> Chloroethane <0.2 <0.38 <br /> Carbon disulfide <0.1 I <0.86 <br /> 1,2,4-Trimethylbenzene <0.33 <0.29 _ -- <br /> 1,3,5-Trimethylbenzene <0.20 <0.32 <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds (EPA Method 3520/8270) <br /> Di-n-butyl Phthalate {0.0037-) <br /> All Compounds ND ND - - <br /> Organochlorine Pesticides and Polychlorinated Biphenyl's <br />