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M i ® ® ® M ® ® M <br />HISTORICAL SUMMARY OF MOIK <br />VADOSE ZONE <br />NORTH COUNTY SANITARY LAN <br />VZ -4 <br />Units: mg/I, unless noted <br />Sample Designation VZ-4A/B VZ-4A/B VZ=4A/B VZ-4A/B <br />Sampling Date 10/27/98 3/2/00 1/10/01 4/12/01 <br />Monitoring and Field Parameters <br />Quarterly Monitoring and Field P; <br />Total Dissolved Solids NA NA 726 762 <br />Chloride 277 NA 33.4 34.5 <br />Constituents of Concern <br />Volatile Organic Compounds _(ug, <br />1,1-Dichloroethene <br />NA <br />NA <br />NA <br />NA <br />Carbon Disulfide <br />NA <br />NA <br />NA <br />NA <br />1,1-Dichloroethane <br />NA <br />NA <br />NA <br />NA <br />Trichlorofluoromethane <br />NA <br />NA <br />NA <br />NA <br />1,1,1 -trichloroethane <br />NA <br />NA <br />NA <br />NA <br />Trichloroethene <br />NA <br />NA <br />NA <br />NA <br />Tetra he oroethene <br />NA <br />NA <br />NA <br />NA <br />Acetone <br />NA <br />NA <br />NA <br />NA <br />Methylene Chloride <br />NA <br />NA <br />NW -NA <br />Chloroform <br />NA <br />NA <br />NA <br />NA <br />Trichloroethylene <br />NA <br />NA <br />NA <br />NA <br />Benzene <br />NA <br />NA <br />NA <br />NA <br />Toluene <br />NA <br />NA <br />NA <br />NA <br />Ethylbenzene <br />NA <br />NA <br />NA <br />NA <br />m/p Xylene <br />NA <br />NA <br />NA <br />NA <br />o -Xylene <br />NA <br />NA <br />NA <br />NA <br />Chloroform <br />NA <br />NA <br />NA <br />NA <br />Carbon Disulfide <br />NA <br />NA <br />NA <br />NA <br />1,1-dichloroethen <br />NA <br />NA <br />NA <br />NA <br />Tetrachloroethene <br />NA <br />NA <br />NA <br />NA <br />® A M i ® ® ® ® Y1 <br />