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MMMMMMMM M MAN <br />HISTORICAL SUMMARY OF MOh <br />VADOSE ZONE <br />NORTH COUNTY SANITARY LAN <br />VZ -3 <br />Units: mg/I, unless noted <br />Sample Designation VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B <br />Sampling Date 4/10/97 1/28/98 5/4/98 7/16/98 10/27/98 4/26/99 3/2/00 4/28/00_ <br />Monitoring and Field Parameters <br />Ouarterlv Monitorina and Field Par, <br />To-fa—[Diss—solved Solids <br />NA <br />NA <br />2,120 <br />1,760 <br />NA <br />NA <br />NA <br />NA <br />Chloride <br />NA <br />NA <br />670 <br />642 <br />446 <br />NA <br />NA <br />NA <br />Sulfate <br />NA <br />NA <br />216 <br />218 <br />4 <br />NA <br />NA <br />NA <br />Nitrate Nitrogen <br />NA <br />NA <br />9.10 <br />14.00 <br />15.00 <br />NA <br />NA <br />NA <br />pH (std. units) <br />NA <br />6.91 <br />6.45 <br />6.80 <br />5.26 <br />6.87 <br />6-.8-3-7.16 <br />NA <br />Electrical Conductivity (umhos/cm) <br />NA <br />2_,330 <br />1,680 <br />2,330 <br />2,946 <br />2,953 <br />921 <br />2,902 <br />Alkalinity as CaCO3 <br />NA <br />NA <br />435 <br />192 <br />NA <br />NA <br />NA <br />NA <br />Bicarbonate Alkalinity as CaCO3 <br />NA <br />NA <br />435 <br />NA <br />NA <br />NA <br />NA <br />NA <br />Carbonate Alkalinity as CaCO3 <br />NA <br />NA <br /><0.55 <br />NA <br />NA <br />NA <br />NA <br />NA <br />Sulfides <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />Cyanides <br />NA <br />NA <br />NA <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 />NA <br />NA <br />NA <br />Constituents of Concern <br />Volatile Oraanic Compounds (up. <br />1,1-Dichloroethene <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />Carbon Disulfide <br />NA <br />NA <br />NA <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 />NA <br />NA <br />NA <br />Trichlorofluoromethane <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />_ <br />1,1,1 -trichloroethane <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />Trichloroethene <br />NA <br />NA <br />NA <br />NA <br />NA <br />_NA <br />NA <br />NA <br />NA <br />Tetra chloroethene <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />Acetone <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />Methylene Chloride <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA _ <br />Chloroform <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />Tric loroethylene <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />Benzene <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />Carbon Disulfide NA NA NA NA NA NA NA NA <br />1,1-dichloroethen NA NA NA NA NA NA NA NA <br />Tetra chloroethene NA NA NA NA NA NA NA NA <br />M M w w M M� M M <br />