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9 <br />HISTORICAL SUMMARY OF MONITORING RESULTS <br />VADOSE ZONE <br />NORTH COUNTY SANITARY LANDFILL <br />VZ -1 <br />Units: mg/l, unless noted <br />Z-1 Z- Z- Z- Z- VZVZ- 1 Z-1 v -1 VZ -1 VZ -1 VZ -1 Z- VT --1 <br />Samp a Designation 5/4/9 <br />8 <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/ <br />Monitoring and Field Parameters <br />Cyani es NA NA NA NN rvN �rh •,, .,. .,. .... <br />otal Organic ar on A A A NA NA NA NA A 20.0 19.8 18.6 NA NA A 82 <br />Constituents of Concern <br />1,1-dichoroethen NA NA NA NH rvM INM — '^ <br />Tetrachloroethane NA A NA NA NA NA NA NA A NA NA NA A NA A <br />Only organic compounds detected in one or more samples are listed <br />NA = Not Analyzed <br />