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® r rr r rr ® rr rr rr ® rr rr r ® rr rr <br />HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />GROUNDWATER <br />FOOTHILL SANITARY LANDFILL <br />LW -1 <br />Units: mg/l, unless noted <br />a m pi a es gnat on -1 -1 W-1 -1 LW -1 LWT LW -1 LW -1 LW -1 LW -1 LW -1 LW -1 LW -1 LW -1 LW -1 -1 LW -1 <br />Sampling Date 7/10/89 10/20/89 1/17/90 4/4/90 7/12/90 10/2/90 1/7/91 4/2/91 7/19/91 10/9/91 1/10/92 4/3/92 7/1/92 10/2/92 1/5/93 4/1/93 7/1/93 <br />Quarterly Monitoring and Field Parameters <br />Chlorobenzene <br />Acetone <br />1,4 -Dichlorobenzene <br />Tetrachloroethene <br />Constituents of Concern Parameters <br />Method <br />NR NR NR NR _ NR NR NR NR NR NR NR <br />Method 8150A <br />= Trace Concentration <br />(1) This analytical result appears to be anomalous and therefore was not used in statistical evaluation procedures. <br />ND = Not Detected <br />NR = Not Required <br />LW -1 (Archive); Printed: 3/4/03 21 of 24 <br />