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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 Diss ved Solids 804 NA NA 726 762 <br />Chloride 35 277 NA 33.4 34.5 <br />Cyan! es ANA <br />—Total Organic Carbon NA NA NA NA NA <br />Constituents of Concern <br />Volatile Organic Compounds u /l <br />1,1-Dchioroethene <br />NA NA NA NA NA <br />----Carbon—Disulfide <br />NA NA NA NA NA <br />TT -Bic h oroet h ane <br />NA NA NA <br />Tnc oro uoromet ane <br />N NA <br />---T-,f-,T--trichloroethane <br />Tr cFi ol—roelfiene <br />NA NA NA NA NA <br />etrac oroe t h ene <br />A <br />Acetone <br />NA NA NA NA NA <br />et y ene h or e <br />Moro orm <br />NA NA NA NA <br />ric of roeth ene <br />NA NA NA <br />--Benzene <br />NA NA NA NA NA <br />1,1-dichloroethen NA NA NA NA NA <br />Tetrachloroethene NA NA A <br />Only organic compounds detectedin one or more samples are listed <br />NA = Not Analvzed <br />0 0 0 <br />