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M M M M M M M M M M ® M ® M M M M M M <br />HISTORICAL SUMMARY OF MONITORING RESULTS <br />VADOSE ZONE <br />NORTH COUNTY SANITARY LANDFILL <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 VZ -1 VZ -1 VZ -1 VZ -1 VZ -1 VZ -1 VZ -1 VZ -1 VZ -1 VZ -1 <br />Sampling Date 12/1/91 3/1/92 11/1/92 2/1/93 5/1/93 7/1/93 3/1/94 8/1/94 12/1/94 1/20/95 4/5/95 1/5/96 4/5/96 1/16/97 4/10/97 1/30/98 5/4/98 7/16/98 <br />Monitoring and Field Parameters <br />Constituents of Concern <br />Tetrachloroethene NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA <0.87 NA <br />