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HISTORICAL SUMMARY OF MON <br />VADOSE ZONE <br />NORTH COUNTY SANITARY LAN <br />VZ -1 <br />Units: mg/I, unless noted <br />Sample Designation VZ -1 VZ -1 VZ -1 VZ -1 VZ -1 VZ -1 VZ -1 VZ -1 <br />Sampling Date 1/21/99 4/26/99 4/28/00 10/6/00 1/10/01 4/12/01 10/9/01 10/9/03 <br />Monitoring and Field Parameters <br />Constituents of Concern <br />Volatile Oraanic Compounds (ua, <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 />1,1,1 -trichloroethane <br />NA <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 />Tetrachloroethene <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 />1,1-dichioroethen NA NA NA NA NA NA NA NA <br />Tetrachloroethene NA NA NA NA NA NA NA NA <br />