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Sampling Designation Conc. <br />Sampling Date 01/14/25 04/10/25 01/14/25 04/10/25 01/14/25 04/10/25 01/13/25 04/10/25 01/14/25 04/10/25 01/14/25 04/10/25 01/14/25 04/10/25 01/14/25 04/10/25 01/14/25 04/10/25 Limit** <br />Monitoring and Field Parameters <br />Elevations (feet)ISV ISV ISV ISV <br />TOC Elevation 244.21 244.21 299.62 299.62 320.75 320.75 341.02 341.02 256.52 256.52 226.88 226.88 264.13 264.13 255.93 255.93 258.43 258.43 NR <br />Depth to Groundwater 213.07 212.89 273.62 273.49 291.52 292.40 301.71 301.53 Dry Dry 203.47 202.43 232.18 229.22 226.23 227.00 281.10 280.72 NR <br />Groundwater Elevation 31.14 31.32 26.00 26.13 29.23 28.35 39.31 39.49 Dry Dry 23.41 24.45 31.95 34.91 29.70 28.93 -22.67 -22.29 NR <br />General Water Quality Parameters (field) <br />Temperature (oC) 18.3 -- 18.2 -- NS NS 18.9 -- NS -- 19.4 -- 17.3 -- NS -- 15.1 -- NR <br />pH (units) 7.06 -- 8.49 -- NS NS 7.75 -- NS -- 7.75 -- 7.57 -- NS -- 5.7 -- 6.1-8.8 <br />Electrical Conductivity (μS/cm) 243.1 -- 159.3 -- NS NS 257.4 -- NS -- 247.3 -- 279.6 -- NS -- 457.3 --483.9 <br />Turbidity (NTU) 12.90 -- 14.60 -- NS NS 7.70 -- NS -- NS -- 11.40 -- NS -- 13.00 -- 6.8 <br />Constituents of Concern (mg/L) <br />Calcium, dissolved 22 -- 16 -- NS NS 30 -- NS -- 21 -- 27 -- NS -- 26 -- 48.2 <br />Magnesium, dissolved 11--8.1--NSNS14--NS--12--11--NS--12--20.3 <br />Sodium, dissolved 14 -- 13 -- NS NS 12 -- NS -- 15 -- 24 -- NS -- 13 -- 15.9 <br />Potassium, dissolved 3.4 -- 4.0 -- NS NS 3.9 -- NS -- 3.6 -- 9.6 -- NS -- 5.1 -- 5.4 <br />Iron, dissolved <0.030 -- <0.030 -- NS NS <0.030 -- NS -- 0.03 J -- <0.030 -- NS -- 0.031 J -- - <br />Bicarbonate Alkalinity as HCO3 130 -- 98 -- NS NS 130 -- NS -- 120 -- 120 -- NS -- 130 -- 130** <br />Carbonate Alkalinity as CaCO3 <2.5 -- <2.5 -- NS NS <2.5 -- NS -- <2.5 -- <2.5 -- NS -- <2.5 -- 8** <br />Total Alkalinity as CaCO3 110 -- 80 -- NS NS 110 -- NS -- 98 -- 100 -- NS -- 110 -- NR <br />Chloride 8.3 -- 4.6 -- NS NS 18 -- NS -- 7.7 -- 26 -- NS -- 7.8 -- 55.1 <br />Nitrate - Nitrogen 1.9 -- 2.5 -- NS NS 2.7 -- NS -- 2.7 -- 0.87 -- NS -- 1.6 -- 3.7 <br />Sulfate 8.6 --2.0 --NS NS12 --NS --6.2 --24 -- NS -- 13 -- 23 <br />Total Dissolved Solids 210 -- 170 -- NS NS 230 -- NS -- 210 -- 270 -- NS -- 230 -- 348 <br />Volatile Organic Compounds (8260B) (ȝg/L) <br />All Compounds ND -- ND -- NS NS ND -- NS -- ND -- ND -- NS -- ND -- detect <br />-- = Site is sampled semiannually during first and third quarters. Sampling not required during second and fourth quarters. <br />ND = Not Detected <br />NR = Not Required <br />NS = Not Sampled <br />ȝg/L = micrograms per liter <br />mg/L = milligrams per liter <br />< = Not detected at or above indicated method detection limit <br />μS/cm = microsiemens per centimeter <br />NTU = nephelometric turbidity unit <br />oC = degrees Celcius <br />J = Trace concentration (estimated value) <br />Bolded values indicate VOC detections, underlined values indicate concentration limit exceedances <br />Underlined values indicate concentration limit exceedances. <br />** = Concentration limit updated in 2SA23 with data from MW-4A; where CL could not be updated, CL from MW-4 is used <br />LW-1 sampling/testing is not part of the monitoring progrram <br />ISV = Insufficient volume present to sample <br />TOC = Top of Casing <br />Table 2 <br />First Semiannual 2025 Groundwater Monitoring Results <br />Foothill Sanitary Landfill <br />MW-1A MW-2R MW-3 MW-4A MW-5 MW-6 MW-7 MW-7R LW-1 <br />RI