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HISTORICAL SUMMARY OF MONITORING RESULTS <br />VADOSE ZONE <br />NORTH COUNTY SANITARY LANDFILL <br />VZ -5 <br />Units: mg/1, unless noted <br />Sample Designation VZ -5A/9 VZ -5 Z-5A/B -5 B VZ -5 B VZ-5A/B Z-5A/B <br />Sampling Date 4/5/95 1/16/97 4/10/97 7/16/98 10/27/98 10/6/00 10/9/03 <br />Monitoring and Field Parameters <br />Quarterly Monitoring_ and Field Parameters <br />Total Dissolved Solids NA NA NA 632 NA NA 790 <br />Cyanides NA NA NA NA NA NA NA <br />Total q ni arbon ANA NA A A NA N <br />Constituents of Concern <br />Volatile Organic Compounds WWII <br />1,1-Dchloroethene <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 />1,1—Dichtoroethane <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 />A <br />A <br />NA <br />_ <br />1,1,1 -trichloroethane <br />NA <br />A <br />NA <br />NA <br />NA <br />NA <br />NA <br />Trichloroethene <br />NA <br />NA <br />NA <br />NA <br />N <br />NA <br />NA <br />Tetrachloroethene <br />NA <br />NA <br />NA <br />NA <br />NA <br />A <br />NA <br />Methylene Chloride NA NA NA NA NA NA NA <br />Chloroform NA NA NA NA NA NA NA <br />Trichloroethylene NA NA NA NA NA NA _ NA <br />Benzene NA NA NA NA NA NA NA <br />Carbon Disulfide NA�f A NA NA NA NA NA <br />1,1-dichlor6ethen NA NA —NA NA NA NA NA <br />Tetrachloroethene NA WK—NA NA NA NA A <br />Only organic compounds detected in one or more samples are listed <br />NA = Not Analvzed <br />