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HISTORICAL SUMMARY OF ANALYTICAL RESULTS GROUNDWATER FOOTHILL SANITARY LANDFILL MW-7R Units: mg/l, unless noted Sample Designation MW-7R MW-7R MW-7R MW-7R MW-7R MW-7R MW-7R Sampling Date 6/28/23 7/20/23 1/9/24 8/22/24 10/21/24 1/14/25 4/10/25 (5 YR) ISV WL ISV ISV Methyl methacrylate <1.5 NA NA NS -- NS -- Propionitrile <4.2 NA NA NS -- NS -- 1,1,2-Trichlorotriflouroethane NA NA NA NS -- NS -- 1,2,3-Trichlorobenzene NA NA NA NS -- NS -- 1,2,4-Trimethylbenzene NA NA NA NS -- NS -- 1,3,5-Trimethylbenzene NA NA NA NS -- NS -- 2-Chlorotoluene NA NA NA NS -- NS -- 4-Chlorotoluene NA NA NA NS -- NS -- 4-Isopropyltoluene NA NA NA NS -- NS -- Bromobenzene NA NA NA NS -- NS -- Isoproplybenzene NA NA NA NS -- NS -- m/p-Xylene NA NA NA NS -- NS -- n-Butylbenzene NA NA NA NS -- NS -- n-Propylbenzene NA NA NA NS -- NS -- sec-Butylbenzene NA NA NA NS -- NS -- tert-Butylbenzene NA NA NA NS -- NS -- Semivolatile Organic Compounds (3520/8270) Napthalene 0.40 J NA NA NS -- NS -- All Compounds ND NA NA NS -- NS -- Organophosphate Pesticides (8141A) All Compounds ND NA NA NS -- NS -- Constituents of Concern Parameters Alkalinity as CaCO3 NA NA 110 NS -- NS -- Carbonate Alkalinity as CaCO3 <2.5 <2.5 <2.5 NS -- NS -- Bicarbonate Alkalinity as HCO3 78 140 130 NS -- NS -- Hydroxide Alkalinity as CaCO3 NA NA NA NS -- NS -- Cyanide 0.0017 J NA NA NS -- NS -- Sulfide <0.050 NA NA NS -- NS -- Calcium, Dissolved 15 19 18 NS -- NS -- Potassium, Dissolved 4.1 5.4 6.7 NS -- NS -- Magnesium, Dissolved 10 12 11 NS -- NS -- Sodium, Dissolved 21 22 20 NS -- NS -- Chlorinated Herbicides (μg/L) (8151A) All Compounds ND NA NA NS -- NS -- Metals (mg/L) Aluminum, Dissolved 0.056 NA NA NS -- NS -- Antimony, Dissolved <0.0049 NA NA NS -- NS -- Arsenic, Dissolved 0.0076 NA NA NS -- NS -- Barium, Dissolved 0.0066 J NA NA NS -- NS -- Beryllium, Dissolved <0.00050 NA NA NS -- NS -- Cadmium, Dissolved 0.0016 J NA NA NS -- NS -- Chromium, Total Dissolved <0.0010 NA NA NS -- NS -- Cobalt, Dissolved <0.0011 NA NA NS -- NS -- Copper, Dissolved <0.0010 NA NA NS -- NS -- Iron, Dissolved <0.030 <0.030 <0.030 NS -- NS -- Lead, Dissolved 0.00005 J NA NA NS -- NS -- Manganese, Dissolved 0.084 NA NA NS -- NS -- Mercury, Dissolved 0.00021 NA NA NS -- NS -- Nickel, Dissolved 0.0012 J NA NA NS -- NS -- Selenium, Dissolved <0.00025 NA NA NS -- NS -- Silver, Dissolved <0.0012 NA NA NS -- NS -- Thallium, Dissolved <0.010 NA NA NS -- NS -- Tin, Dissolved <0.0072 NA NA NS -- NS -- Vanadium, Dissolved 0.0058 J NA NA NS -- NS -- Zinc, Dissolved <0.005 NA NA NS -- NS -- 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 NS = Not Sampled ND = Not Detected ISV = Insufficient Volume -- = Site sampled semiannually. Samples not required during this quarter. WL = Water level only n:\consulting\data\shared\projects\xls\qmr\79\791289\20250728_FH-1SA25 Historical_JQC.xlsx 36 of 52