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HISTORICAL SUMMARY OF ANALYTICAL RESULTS GROUNDWATER FOOTHILL SANITARY LANDFILL MW-1A Units: mg/l, unless noted Sample Designation Sampling Date Isobutanol Methacrylonitrile Methyl methacrylate Bromobenzene Isoproplybenzene m/p-Xylene n-Butylbenzene n-Propylbenzene sec-Butylbenzene tert-Butylbenzene Semivolatile Organic Compounds (3520/8270) Phenol All Other Compounds Organo-phosphorous Pesticide (μg/L) (8141A) All Compounds Organochlorine Pesticides and Polychlorinated Biphenyl's (μg/L) (EPA Method 3510/8080) All Compounds Chlorinated Herbicides (μg/L) (8151A) All Compounds Constituents of Concern Parameters Alkalinity as CaCO3 Carbonate Alkalinity as CaCO3 Bicarbonate Alkalinity as HCO3 Hydroxide Alkalinity as CaCO3 Cyanide Sulfide Total Organic Carbon Calcium, Dissolved Potassium, Dissolved Magnesium, Dissolved Sodium, Dissolved Metals (mg/L) Aluminum, Dissolved Antimony, Dissolved Arsenic, Dissolved Barium, Dissolved Beryllium, Dissolved Boron, Dissolved Cadmium, Dissolved Chromium, Total Dissolved Chromium Hexavalent Cobalt, Dissolved Copper, Dissolved Iron, Dissolved Lead, Dissolved Manganese, Dissolved Mercury, Dissolved Nickel, Dissolved Selenium, Dissolved Silver, Dissolved Thallium, Dissolved Tin, Dissolved Vanadium, Dissolved Zinc, Dissolved J = Trace Concentration [1] This analytical result appears to be anomalous and therefore was not used in statistical evaluation procedures. {1} Parameter also detected in one or more quality control blanks NA = Not Available NM = Not Measured NS = Not Sampled ND = Not Detected -- = Site sampled semiannually. Samples not required during this quarter. WL = Water level only MW-1A MW-1A MW-1A MW-1A MW-1A MW-1A 7/19/23 1/9/24 8/22/24 10/21/24 1/14/25 4/10/25 (5-YR) WL NA NA <7.7 -- NA -- NA NA <1.7 -- NA -- NA NA <1.5 -- NA -- NA NA NA -- NA -- NA NA NA -- NA -- NA NA NA -- NA -- NA NA NA -- NA -- NA NA NA -- NA -- NA NA NA -- NA -- NA NA NA -- NA -- NA NA <0.21 -- NA -- NA NA ND -- NA -- NA NA ND -- NA -- NA NA NA -- NA -- NA NA ND -- NA -- NA 99 NA -- 110 -- <2.5 <2.5 <2.5 -- <2.5 -- 120 120 130 -- 130 -- NA NA NA -- NA -- NA NA <0.0017 -- NA -- NA NA <0.05 -- NA -- NA NA NA -- NA -- 21 20 20 -- 22 -- 3.3 3.5 3.2 -- 3.4 -- 11 9.9 11 -- 11 -- 17 17.0 14 -- 14 -- NA NA <0.023 -- NA -- NA NA <0.0049 -- NA -- NA NA 0.0014 J -- NA -- NA NA 0.084 -- NA -- NA NA <0.0005 -- NA -- NA NA NA -- NA -- NA NA <0.0011 -- NA -- NA NA 0.0025 J -- NA -- NA NA NA -- NA -- NA NA <0.0011 -- NA -- NA NA <0.001 -- NA -- <0.030 <0.030 <0.030 -- <0.030 -- NA NA <0.000021 -- NA -- NA NA 0.000085 J -- NA -- NA NA 0.000032 J -- NA -- NA NA 0.00048 J -- NA -- NA NA 0.00035 J -- NA -- NA NA <0.0012 -- NA -- NA NA <0.010 -- NA -- NA NA <0.0072 -- NA -- NA NA 0.018 -- NA -- NA NA <0.005 -- NA -- n:\consulting\data\shared\projects\xls\qmr\79\791289\20250728_FH-1SA25 Historical_JQC.xlsx 8 of 52