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M' M M M � m M <br />HISTORICAL SUMMARY OF MONITORING RESULTS <br />VADOSE ZONE <br />NORTH COUNTY SANITARY LANDFILL <br />VZ -3 <br />Units: mg/I, unless noted <br />Sample Designation VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B VZ-3A/B <br />Samplinq Date 9/1/91 3/1/92 6/1/92 11/1/92 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 <br />Monitoring and Field Parameters <br />Metals <br />Chromium, Total NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA <br />Chromium Hexavalent NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA <br />Only organic compounds detected in one or more samples are listed <br />NA = Not Analvzed <br />