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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />GROUNDWATER <br />FOOTHILL SANITARY LANDFILL <br />Units: mg/I, unless noted <br />Sample Designation MW -1 MW -1 MW -1 <br />Sampling Date 7/27/06 1/31/07 7/23/07 <br />Monitoring and Field Parameters <br />Temperature (°C) (field) <br />21.5 <br />14.8 <br />20.8 <br />Chloride <br />6 <br />6.1 <br />5.8 <br />Nitrate -Nitrogen <br />2.9 <br />3 <br />2.8 <br />Total Dissolved Solids <br />206 <br />170 <br />73 <br />Sulfate <br />5 <br />5 <br />4.9 <br />pH(std.units) (fiield) <br />7.14 <br />7.37 <br />7.18 <br />Electrical Conductivity (umhos/cm) (field) <br />358 <br />393 <br />219 <br />Turbidity (NTU) (field) <br />12.6 <br />13.9 <br />11.64 <br />Calcium <br />22.8 <br />18 <br />19 <br />Potassium <br />11.2 <br />9.6 <br />3.1 <br />Magnesium <br />3.5 <br />3.1 <br />9.9 <br />Sodium <br />12.9 <br />13.0 <br />11.0 <br />Trichloroethene (TCE) <0.13 <br /><0.13 <br /><0.13 <br />1,1-Dichloroethene <0.39 <br /><0.39 <br /><0.39 <br />Chloroform <0.20 <br /><0.20 <br /><0.20 <br />Benzene <0.17 <br /><0.17 <br /><0.17 <br />m/p-Xylene NR <br />. NR <br />NR <br />Chlorobenzene <0.16 <br /><0.16 <br /><0.16 <br />Methylene Chloride <0A8 <br /><0.48 <br />'<0.48 <br />Acetone <1.9 <br />4.6" <br />7.5" <br />Napthalene <0.24 <br /><0.24 <br /><0.24 <br />Methyl ter -butyl ether <0.32 <br /><0.32 <br /><0.32 <br />Toluene <0.22 <br /><0.22 <br /><0.22 <br />1,4 -Dichlorobenzene <0.14 <br /><0.14 <br /><0.14 <br />Tetrachloroethene <0.19 <br /><0.19 <br /><0.19 <br />2-Butanone <0.92 <br /><0.92 <br /><0.92 <br />1,3-Dichloropropane <0.12 <br /><0.12 <br /><0.12 <br />Chloromethane <0.25 <br /><0.25 <br /><0.25 <br />Chloroethane <0.2 <br /><0.2 <br /><0.2 <br />Carbon disulfide <0.23 <br /><0.23 <br /><0.23 <br />1,2,4-Trimethylbenzene <0.23 <br /><0.23 <br /><0.23 <br />1,3,5-Trimethylbenzene <0.20 <br /><0.20 <br /><0.20 <br />Constituents of Concern Parameters <br />Semivolatile Organic Compounds (EPA Method 3520/8270) <br />All Compounds NR <br />NR <br />NR <br />Organochlorine Pesticides and Polychlorinated Biohenyl's <br />(EPA Method 3510/8080) <br />All Compounds NR <br />NR <br />NR <br />° = Trace Concentration <br />[1] This analytical result appears to be anomalous and therefore was not used in statistical evaluation procedures. <br />(1 ) Parameter also detected in one or more quality control blanks <br />NO = Not Detected <br />NM - Not Measured <br />NR = Not Required <br />n:\consulting\data\shared\projects\xls\qmr\79\791289\FH012208g1 (2).xls <br />