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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />GROUNDWATER <br />FOOTHILL SANITARY LANDFILL <br />MW-5 <br />Units: mg/l, unless noted <br />Sample Designation <br />Sampling Date <br />Bromobenzene <br />Isoproplybenzene <br />m/p-Xylene <br />n-Butylbenzene <br />n-Propylbenzene <br />sec-Butylbenzene <br />tert-Butylbenzene <br />Semivolatile Organic Compounds (3520/8270) <br />Di-n-butyl Phthalate <br />All Other Compounds <br />Organochlorine Pesticides and Polychlorinated Biphenyl's <br />(EPA Method 3510/8080) <br />All Compounds <br />Organophosphate Pesticides <br />(EPA Method 8141A) <br />Azinphos methyl (Guthion) <br />Fensulfothion <br />All Other Compounds <br />Constituents of Concern Parameters <br />Alkalinity as CaCO3 <br />Carbonate Alkalinity as CaCO3 <br />Bicarbonate Alkalinity as HCO3 <br />Hydroxide Alkalinity as CaCO3 <br />Cyanide <br />Sulfide <br />Total Organic Carbon <br />Calcium, Dissolved <br />Potassium, Dissolved <br />Magnesium, Dissolved <br />Sodium, Dissolved <br />Chlorinated Herbicides (μg/L) <br />(EPA Method 8151A) <br />All Compounds <br />Chlorophenoxy Herbicides <br />(EPA Method 8150A Modified) <br />All Compounds <br />Metals (mg/L) <br />Aluminum, Dissolved <br />Antimony, Dissolved <br />Arsenic, Dissolved <br />Barium, Dissolved <br />Beryllium, Dissolved <br />Boron, Dissolved <br />Cadmium, Dissolved <br />Chromium, Total Dissolved <br />Chromium Hexavalent <br />Cobalt, Dissolved <br />Copper, Dissolved <br />Iron, Dissolved <br />Lead, Dissolved <br />Manganese, Dissolved <br />Mercury, Dissolved <br />Nickel, Dissolved <br />Selenium, Dissolved <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 and therefore <br />was not used in statistical evaluation procedures. <br />{1} Parameter also detected in one or more quality control <br />blanks <br />NA = Not Available <br />NS = Not Sampled <br />ND = Not Detected <br />-- = Site sampled semiannually. Samples not required during this <br />WL = Water level only <br />MW-5 MW-5 MW-5 MW-5 MW-5 <br />1/9/24 8/21/24 10/21/24 1/14/25 4/10/25 <br />Dry Dry WL Dry Dry <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS NS <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />NS NS -- NS -- <br />n:\consulting\data\shared\projects\xls\qmr\79\791289\20250728_FH-1SA25 Historical_JQC.xlsx 30 of 52