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HISTORICAL SUMMARY OF MONITORING RESULTS <br />VADOSE ZONE <br />NORTH COUNTY SANITARY LANDFILL <br />VZ -1 <br />Sampieuesignatlon VL -1 V4-1 VL -I VL -I VL'I VL -I VL'I VL -1 VL -1 VL -1 VL -1 VL -I VL -1 VL -1 VL -1 <br />Samniina 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 <br />Monitoring and Field Parameters <br />Quarterly Monitoring and Field Parameters <br />Total Dissolved Solis NA 870 1,600570 330 740 460 860 809 750 527 800 420 480 442 1,080 312 <br />Chloride NA 31 160 38 20 71 17 50 61 25 25 35 15 12 8 13 5.6 <br />Constituents of Concern <br />Volatile Organic Compounds (ua/Il <br />�,1 Dicfiloroet�iene NA A A NA NA NA NA NA NA <0.40 NA NA NA NA NA NA <0.72 <br />-1, 1, 1 -trichloroethane NA NA NA NA NA NA NA NA <0.31 NA NA NA NA NA NA <1.2 <br />Trichlornathane NA NA NA NA NA NA NA NA NA NA NA <0.89 <br />Toluene NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 10 <br />Only organic compounds detecte none or more samples are listed <br />NA = Not Analyzed <br />