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MM MIN <br />Units: mg/I, unless noted <br />M Mao <br />M�"an M MM MM MM M <br />HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />GROUNDWATER <br />FOOTHILL SANITARY LANDFILL <br />Sample Designation <br />Sampling Date <br />MW4 <br />7/23/07 <br />All Compounds <br />Monitoring and Field Parameters <br />General Water Quality Parameters <br />Organochlorine Pesticides and <br />Polvchlorinated Biohenvl's <br />Temperature (°C) (field) <br />23.5 <br />Chloride <br />6.8 <br />Nitrate -Nitrogen <br />1.6 <br />Total Dissolved Solids <br />193 <br />Sulfate <br />pH (std. units) (field) <br />9.2 <br />7.61 <br />Electrical Conductivity (umhos/cm) (field) <br />266 <br />Turbidity (NTU) (field) <br />48.1 <br />Calcium <br />21.6 <br />Potassium <br />4.23 <br />Magnesium <br />10.9 <br />Sodium <br />15 <br />Volatile Organic Compounds (ug/Il <br />Trichloroethene (TCE) <br /><0.13 <br />1, 1 -Dichloroethene <br /><0.39 <br />Chloroform <br /><0.20 <br />Benzene <br /><0.17 <br />m/p-Xylene <br />NR <br />_ Chlorobenzene <br /><0.16 <br />Methylene Chloride <br /><0.48 <br />Acetone <br /><1.8 <br />Napthalene <br /><0.24 <br />Methyl ter -butyl ether <br /><0.32 <br />Toluene <br /><0.22 <br />1,4 -Dichlorobenzene <br /><0.14 <br />Tetrachloroethene <br /><0.19 <br />2-Butanone <br /><0.92 <br />1,3-Di1hloropropane <br /><0.12 <br />Chloromethane <br /><0.25 <br />Chloroethane <br /><0.2 <br />Carbon disulfide <br /><0.11 <br />1,2,4-T rimethylbenzene <br /><0.23 <br />1,3,5-Trimethylbenzene <br /><0.20 <br />Constituents of Concern Parameters <br />Semivolatile Organic Compounds (EPA Method 3520/8270) <br />Di -n -butyl Phthalate {0.0023*) <br />All Compounds <br />ND <br />Organochlorine Pesticides and <br />Polvchlorinated Biohenvl's <br />(EPA Method 3510/8080) <br />