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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />GROUNDWATER <br />FOOTHILL SANITARY LANAFILL <br />MW-4 <br />Units: mg/l, unless noted <br />Sample Designation <br />Sampling Date <br />Silver, Dissolved <br />Thallium, Dissolved <br />Tin, Dissolved <br />Vanadium, Dissolved <br />Zinc, Dissolved <br /> J = Trace Concentration <br />[1] This analytical result appears to be anomalous aNA therefore <br />was not used in statistical evaluation procedures. <br />{1} Parameter also detected in one or more quality control blanks <br />NA = Not Available <br />NS = Not Sampled <br />ND = Not Detected <br />-- = Site sampled semiannually. Samples not required during this qu <br />WL = Water level only <br />MW-4A MW-4A MW-4A MW-4A MW-4A MW-4A MW-4A MW-4A MW-4A MW-4A MW-4A MW-4A MW-4A MW-4A MW-4A <br />5/14/19 7/23/19 1/21/20 7/28/20 1/20/21 7/20/21 1/26/22 8/24/22 2/8/23 7/19/23 1/9/24 4/10/24 10/21/24 1/13/25 4/10/25 <br />(5-YR)WL <br /><0.0012 NA NA NA NA NA NA NA NA NA NA <0.0012 -- NA -- <br /><0.010 NA NA NA NA NA NA NA NA NA NA <0.010 -- NA -- <br /><0.0072 NA NA NA NA NA NA NA NA NA NA <0.0072 -- NA -- <br />0.0072 J NA NA NA NA NA NA NA NA NA NA 0.0068 J -- NA -- <br /><0.005 NA NA NA NA NA NA NA NA NA NA <0.005 -- NA -- <br />n:\consulting\data\shared\projects\xls\qmr\79\791289\20250728_FH-1SA25 Historical_JQC.xlsx 26 of 52