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MM M MM MON M <br />HISTORICAL SUMMARY OF MOh <br />VADOSE ZONE <br />NORTH COUNTY SANITARY LAN <br />VZ -2 <br />Units: mg/I, unless noted <br />Sample Designation VZ-2A/B VZ-2A/B VZ-2A/B VZ-2A/B VZ-2A/B <br />Sampling Date 7/16/98 10/27/98 3/2/00 4/28/00 10/6/00 <br />Monitoring and Field Parameters <br />Quarterly Monitorina and Field Par <br />Total Dissolved Solids <br />947 <br />NA <br />NA <br />NA <br />NA <br />Mhloride <br />237 <br />176 <br />NA <br />NA <br />NA <br />Sulfate <br />71 <br />116 <br />NA <br />NA <br />NA <br />_ <br />Nitrate Nitrogen <br />43 <br />178 <br />NA <br />NA <br />NA <br />pH (std. units) <br />7.39 <br />NA <br />7.04 <br />6.85 <br />7.10 <br />Electrical Conductivity (umhos/cm) <br />1,530 <br />NA <br />1,654 <br />1,790 <br />1,944 <br />Alkalinity as CaG03 <br />188 <br />NA <br />NA <br />NA <br />NA <br />Bicarbonate Alkalinity as CaCO3 <br />NA <br />NA <br />NA <br />NA <br />NA <br />arbonate Alkalinity as CaCO3 <br />NA <br />NA <br />NA <br />NA <br />NA <br />Sulfides <br />NA <br />NA <br />NA <br />NA <br />NA <br />Cyanides <br />NA <br />NA <br />NA <br />NA <br />NA <br />Total Organic Carbon <br />NA <br />NA <br />NA <br />NA <br />NA <br />Constituents of Concern <br />Volatile Organic Compounds tug. <br />1,1-Dichloroethene <br />NA <br />NA <br />NA <br />NA <br />NA <br />Carbon Disulfide <br />NA <br />NA <br />NA <br />NA <br />NA <br />1,1-Dichloroethane <br />NA <br />NA <br />NA <br />NA <br />NA <br />Trichlorofluoromethane <br />NA <br />NA <br />NA <br />NA <br />NA <br />1,1,1 -trichloroethane <br />NA <br />NA <br />NA <br />NA <br />NA <br />Trichloroethene <br />NA <br />NA <br />NA <br />NA <br />NA <br />Tetrachloroethene <br />NA <br />NA <br />NA <br />NA <br />NA <br />Acetone <br />NA <br />NA <br />NA <br />NA <br />NA <br />Methylene Chloride <br />NA <br />NA <br />NA <br />NA <br />NA <br />Chloroform <br />NA <br />NA <br />NA <br />NA <br />NA <br />Trichloroethylene <br />NA <br />NA <br />NA <br />NA <br />NA <br />Benzene <br />NA <br />NA <br />NA <br />NA <br />NA <br />Toluene <br />NA <br />NA <br />NA <br />NA <br />NA <br />Ethylbenzene <br />NA <br />NA <br />NA <br />NA <br />NA <br />m/p Xylene <br />NA <br />NA <br />NA <br />NA <br />NA <br />o -Xylene <br />NA <br />NA <br />NA <br />NA <br />NA <br />Chloroform <br />NA <br />NA <br />NA <br />NA <br />NA <br />Carbon Disulfide <br />NA <br />NA <br />NA <br />NA <br />NA <br />1,1-dichloroethen <br />NA <br />NA <br />NA <br />NA <br />NA <br />Tetrachloroethene <br />NA <br />NA <br />NA <br />NA <br />NA <br />