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HISTORICAL SUMMARY OF MONITORING RESULTS <br />VADOSE ZONE <br />NORTH COUNTY SANITARY LANDFILL <br />VZ -4 <br />Units: mg/l, unless noted <br />Sample Designation VZ-4A/B VZ-4A/B VZ-4A/B VZ-4A/B VZ-4A/B <br />Sampling Date 7/16/98 10/27/98 3/2/00 1/10/01 4/12/01 <br />Monitoring and Field Parameters <br />Quarterly Monitoring and Field Parameters <br />Total Dissolved Solids 804 NA NA 726 762 <br />�hToride 35 277 NA 33.4 34.5 <br />Theo RJ - 110 NA 47.7 52.1 <br />Cyonides NA NA NA NA NA <br />Total Organic Carbon A NA A NA <br />Constituents of Concern <br />Volatile Organic Compounds WWII <br />1,1-Dichloroethene <br />NA <br />NA <br />_ <br />NA <br />NA <br />NA _ <br />Carbon Disulfide <br />NA <br />NA <br />NA <br />NA <br />NA <br />--T, <br />1,1-Dicoroethane <br />hl <br />NA <br />NA <br />NA—NA—NA <br />Trichlorofluoromethane <br />NA <br />NASA <br />FIA <br />A <br />1,1,1 -trichloroethane <br />NA <br />�I A <br />NA <br />NA <br />NA <br />Trichloroethene <br />NA <br />NA <br />NA <br />NA <br />NA <br />Tetrachlor_oethene <br />f IA—WA <br />NA <br />NA <br />NA <br />Acetone <br />NA <br />A <br />NA <br />NA <br />NA <br />Metfiylene Chloride <br />NA <br />NA <br />NA <br />NA <br />NA _ <br />_ <br />NA <br />NA <br />NA <br />NA <br />NA <br />__Chloroform <br />Trichioroethy ene <br />NA <br />(VA <br />NA <br />NA <br />NA __ <br />_ <br />Benzeno <br />NA <br />NA <br />A <br />�f A <br />NA __ <br />_ Carbon DisulM NA NA NA NA NA <br />1 1 -dichfo—roetfien A A NA NA NA <br />TPtrachlaroeth—en e NA NA NA NA NA <br />Only organic compounds detected m one or more samples are listed <br />NA = Not Analyzed <br />