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2016 WDR Groundwater Monitoring Well:G-1A* G-2A* G-3D* G-4* G-5A* G-5B* G-6* G-7 G-8 G-9** G-10 G-11 G-12 G-13 G-14 Conc. Conc. Monitoring Date:1/22/25 1/22/25 1/22/25 1/22/25 1/22/25 1/22/25 1/22/25 1/23/25 1/23/25 1/23/25 1/23/25 1/22/25 1/23/25 1/22/25 1/22/25 Limits Limits Field Measured Parameters:ISV ISV Elevations (feet) Well TOC Elevation 122.23 110.09 113.87 117.12 110.84 111.49 111.38 114.36 120.83 117.30 120.90 114.88 111.33 116.13 123.34 NR NR Depth to Groundwater Dry Dry Dry Dry Dry 178.26 161.65 187.07 180.08 185.09 187.19 181.67 177.20 182.37 172.61 NR NRGroundwater Elevation NA NA NA NA NA -66.77 -50.27 -72.71 -59.25 -67.79 -66.29 -66.79 -65.87 -66.24 -49.27 NR NR Field Parameters Temperature (oC)NS NS NS NS NS NS NS 19.2 19.8 19.7 18.7 19.2 21.7 18.8 18.8 NR NR pH (units) NS NS NS NS NS NS NS 7.49 7.50 7.30 7.49 7.38 7.91 7.81 7.44 6.0-8.1 6.0-8.0 Electrical Conductivity (μ mhos/cm)NS NS NS NS NS NS NS 203.3 196.2 235.0 233.6 222.8 271.6 219.7 275.1 533 450 Turbidity (NTU) NS NS NS NS NS NS NS 0.91 1.82 12.0 0.61 47.2 3.27 12.9 9.15 240 18 Dissolved Oxygen (mg/L)NS NS NS NS NS NS NS 7.06 7.69 6.11 6.81 7.65 6.82 6.86 7.64 I - Oxygen Reduction Potential (mV) NS NS NS NS NS NS NS 140.8 138.8 82 164.8 12.8 120 57.7 210.7 I - Analytical Laboratory Parameters: General Chemistry (mg/L) Dissolved Calcium NS NS NS NS NS NS NS 15 20 17 18 17 20 16 22 23 31 Dissolved Magnesium NS NS NS NS NS NS NS 8.8 9.8 9.3 10 9.1 11 8.3 12 47 23 Dissolved Sodium NS NS NS NS NS NS NS 16 17 16 18 14 22 16 19 35 31 Dissolved Potassium NS NS NS NS NS NS NS 3.5 4.1 3.4 4.1 3.6 6.2 4.2 3.7 110 7 Bicarbonate NS NS NS NS NS NS NS 98 110 100 110 100 140 110 120 200 130 Carbonate NS NS NS NS NS NS NS <4.1 <4.1 <4.1 <4.1 <4.1 <4.1 <4.1 <4.1 200 200 Total Alkalinity NS NS NS NS NS NS NS 80 87 82 93 83 110 91 98 190 165 Chloride NS NS NS NS NS NS NS 7.9 12 10 9.6 9 8.3 6.8 17 44 40 Nitrate as Nitrogen NS NS NS NS NS NS NS 2.0 2.8 1.5 1.7 1.3 2.1 1.1 2.5 9.2 4 Sulfate NS NS NS NS NS NS NS 3.2 3.8 5.6 4.6 6.0 4.1 3.5 5.3 30 31 Dissolved Hardness, Total Calc.NS NS NS NS NS NS NS 74 89 82 86 79 95 73 100 I - Total Dissolved Solids NS NS NS NS NS NS NS 180 200 200 200 200 200 190 220 460 300 Chemical Oxygen Demand NS NS NS NS NS NS NS <4.3 6.2 J 41 17 J 12 J 6.2 J <4.3 8.3 J I - Volatile Organic Compounds (μg/L): All Compounds NS NS NS NS NS NS NS ND ND ND ND ND ND ND ND detect detect < = Not detected at or above indicated method detection limit μg/L = micrograms per liter **Sampling on 01/23/25 was incomplete, and a the other half of samples were completed 01/29/25.mg/L = milligrams per kilogram G-1 and G-12 = Upgradient Well μmhos/cm - micromhos per centimeter NA = Not Applicable NTU = nephelometric turbidity unit NR = Not Required mV = millivolts NS = Not Sampled oC = degrees celcius ND = Not Detected I = Inadequate data points for statistical analysis NM = Not Measured J = Trace concentration (estimated value) Underlined values indicate a concentration limit exceedance. *G-1A, G-2A, G-3D, G-4, G-5A, G-5B, & G-6 = not sampled, not enough water to purge well. Field Parameters measured using a multiparameter digital water quality meter in the field. Table 3 First Quarter 2025 Groundwater Monitoring Results North County Recycling Center and Sanitary Landfill 1 of 1