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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 VZ-4A/B VZ-4A/B VZ-4A/B VZ-4A/B VZ-4A/B VZ-4A/B VZ-4A/B VZ-4A/B VZ-4A/B VZ-4A/B VZ-4A/B VZ-4A/B <br />Sampling Date 2/1/93 5/1/93 3/1/94 5/1/94 8/1/94 12/1/94 1/20/95 4/5/95 7/10/95 1/5/96 4/5/96 7/8/96 10/3/96 1/16/97 4/10/97 1/28/98 514/98__ <br />Monitoring and Field Parameters <br />Constituents of Concern <br />_Volatile Organic Compounds (ug/1) <br />�ich(oroethene A A A <0.40 NA A NA A A <0.7 <br />Carbon Disulfide NA NA NA A NA 0.8 NA NA A NA NA NA NA NA <0.96 <br />aA NA NA 14 NA NA NA NA NA NA NA NA NA <1.2 <br />Carbon Disul i e NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 3.0 <br />1,1-dic oroet en NA NA NA NA NA A NA NA NA NA NA NA NA NA U— <br />Tetrachloroethene A NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 3. <br />Only organic compounds detecte in one or more samples are listed <br />NA = Not Anaivzed <br />0 0 0 <br />