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HISTORICAL SUMMARY OF ANALYTICAL RESULTS GROUNDWATER FOOTHILL SANITARY LANDFILL MW-7 Units: mg/l, unless noted Sample Designation MW-7 MW-7 MW-7 MW-7 MW-7 MW-7 MW-7 MW-7 MW-7 MW-7 MW-7 MW-7 MW-7 MW-7 MW-7 Sampling Date 2/7/19 7/22/19 1/21/20 7/29/20 1/20/21 7/21/21 1/27/22 8/23/22 2/8/23 7/20/23 1/9/24 8/22/24 10/21/24 1/14/25 4/10/25 (5 YR)(5-YR) WL Methyl methacrylate <1.5 NA NA NA NA NA NA NA NA NA NA <1.5 -- NA -- Propionitrile <4.2 NA NA NA NA NA NA NA NA NA NA <4.2 -- NA -- 1,1,2-Trichlorotriflouroethane NA NA NA NA NA NA NA NA NA NA NA NA -- NA -- 1,2,3-Trichlorobenzene NA NA NA NA NA NA NA NA NA NA NA NA -- NA -- 1,2,4-Trimethylbenzene NANANANANANANANANANANANA -- NA -- 1,3,5-Trimethylbenzene NANANANANANANANANANANANA -- NA -- 2-Chlorotoluene NANANANANANANANANANANANA -- NA -- 4-Chlorotoluene NANANANANANANANANANANANA -- NA -- 4-Isopropyltoluene NA NA NA NA NA NA NA NA NA NA NA NA -- NA -- Bromobenzene NANANANANANANANANANANANA -- NA -- Isoproplybenzene NA NA NA NA NA NA NA NA NA NA NA NA -- NA -- m/p-Xylene NA NA NA NA NA NA NA NA NA NA NA NA -- NA -- n-Butylbenzene NA NA NA NA NA NA NA NA NA NA NA NA -- NA -- n-Propylbenzene NA NA NA NA NA NA NA NA NA NA NA NA -- NA -- sec-Butylbenzene NA NA NA NA NA NA NA NA NA NA NA NA -- NA -- tert-Butylbenzene NA NA NA NA NA NA NA NA NA NA NA NA -- NA -- Semivolatile Organic Compounds (3520/8270) Napthalene 0.40 JNANANANANANANANANANA<0.23-- NA -- All Other Compounds NDNANANANANANANANANANAND -- NA -- Organophosphate Pesticides (8141A) All Compounds NDNANANANANANANANANANAND -- NA -- Constituents of Concern Parameters Alkalinity as CaCO3 NANANANANANANANANANA100NA -- 100 -- Carbonate Alkalinity as CaCO3 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 -- <2.5 -- Bicarbonate Alkalinity as HCO3 150 130 130 120 130 120 130 130 130 120 120 120 -- 120 -- Hydroxide Alkalinity as CaCO3 NANANANANANANANANANANANA -- NA -- Cyanide <0.0013 NA NA NA NA NA NA NA NA NA NA <0.0017 -- NA -- Sulfide 0.14NANANANANANANANANANA<0.05-- NA -- Calcium, Dissolved 25 26 25 29 27 26 27 26 28 29 26 26 -- 27 -- Potassium, Dissolved 6.3 5.5 5.1 7.9 9.6 13 9.5 10 11 8.9 8.4 8.9 -- 9.6 -- Magnesium, Dissolved 11 9.5 10 11 9.5 9.7 9.7 10 10 11 10 11 -- 11 -- Sodium, Dissolved 27 25 21 27 24 26 23 25 25 23 25 24 -- 24 -- Chlorinated Herbicides (μg/L) (8151A) All Compounds NDNANANANANANANANANANAND -- NA -- Metals (mg/L) Aluminum, Dissolved <0.023 NA NA NA NA NA NA NA NA NA NA <0.023 -- NA -- Antimony, Dissolved <0.0049NANANANANANANANANANA<0.0049-- NA -- Arsenic, Dissolved 0.0034 NA NA NA NA NA NA NA NA NA NA 0.0016 J -- NA -- Barium, Dissolved 0.064NANANANANANANANANANA0.1 -- NA -- Beryllium, Dissolved <0.00050 NA NA NA NA NA NA NA NA NA NA <0.0005 -- NA -- Cadmium, Dissolved <0.0011NANANANANANANANANANA<0.0011-- NA -- Chromium, Total Dissolved <0.0010 NA NA NA NA NA NA NA NA NA NA 0.0023 J -- NA -- Cobalt, Dissolved <0.0011 NA NA NA NA NA NA NA NA NA NA <0.0011 -- NA -- Copper, Dissolved <0.0010NANANANANANANANANANA<0.001-- NA -- Iron, Dissolved 0.11 <0.030 0.061 <0.030 <0.030 <0.030 <0.030 <0.030 <0.030 <0.030 <0.030 <0.030 -- <0.030 -- Lead, Dissolved <0.000021 NA NA NA NA NA NA NA NA NA NA <0.000021 -- NA -- Manganese, Dissolved 0.29 NA NA NA NA NA NA NA NA NA NA <0.00004 -- NA -- Mercury, Dissolved <0.000029NANANANANANANANANANA0.00004 J-- NA -- Nickel, Dissolved 0.0013 J NA NA NA NA NA NA NA NA NA NA 0.0036 -- NA -- Selenium, Dissolved <0.00025 NA NA NA NA NA NA NA NA NA NA 0.00061 J -- NA -- Silver, Dissolved <0.0012 NA NA NA NA NA NA NA NA NA NA <0.0012 -- NA -- Thallium, Dissolved <0.010 NA NA NA NA NA NA NA NA NA NA <0.01 -- NA -- Tin, Dissolved <0.0072NANANANANANANANANANA<0.0072-- NA -- Vanadium, Dissolved 0.0024 JNANANANANANANANANANA0.0078 J-- NA -- Zinc, Dissolved <0.005 NA NA NA NA NA NA NA NA NA NA <0.005 -- NA -- 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 -- = 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 34 of 52