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® TABLE3 FIRST QUARTER 2013 GROUNDWATER MONITORING RESULTS NORTH COUNTY RECYCLING TER AND SANITARY LANDFILL (Units mg/I unless noted) Sampling G-1 G-2 G-3D G-4 G-5 G-6 Conc. Designation Limits- Sampling imitsSam lin Date 1/22/13 1/22/13 1/22/13 1/22/13 1/22/13 1/22/13 Monitoring and Field Parameters Elevations feet Top of Casing 120.95 NM 114.06 117.35 111.18 114.41 NR Depth to 166.48 NM 158.38 162.02 155.58 159.24 NR Groundwater Groundwater -45.53 NM -44.32 -44.67 -44.4 -44.83 NR Elevation General Water Qualitv Parameters Temperature °C 17.9 NS 19.1 19.0 NS 17.9 NR H units 6.69 NS 7.29 7.61 NS 7.47 6.0-8.0 Electrical 328.6 NS 197.4 160.0 NS 210.3 550 Conductivity uS/cm Turbidity NTU) 74.3 NS 16.4 14.7 NS 61.7 97 Dissolved Oxygen 0.76 NS 0.58 0.74 NS 0.63 1 Redox Potential +147 NS +184 +176 NS +167 1 ® Constituents of Concern Calcium 15 NS 16 10 NS 16 23 Magnesium 7.9 NS 9.0 5.7 NS 8.7 45 Sodium 39 NS 17 14 NS 14 32 Potassium 16 NS 3.7 2.3 NS 3.1 110 Total Alkalinity as 170 NS 85 61 NS 86 190 CaCO3 Bicarbonate Alkalinity 180 NS 100 74 NS 100 200 Chloride 8.2 NS 6.5 6.5 NS {7.61 44 Nitrate as N 1.5 NS 1.4 1.1 NS 1.9 9.2 Sulfate 3.8 NS 3.0 3.7 NS 3.4 30 Hardness as CaCO3 71 NS 77 50 NS 76 1 Total Dissolved 300 NS 190 160 NS 180 310 Solids Chemical Oxygen 23* NS 5.0* 8.3 NS 5.0* 1 Demand Volatile Organic Compounds 82606 u /L All Compounds I ND NS ND ND NS ND detect G-1 = New Upgradient Well I = Insufficient data for statistical analysis NS = Not Sampled Underlined values indicate a concentration limit exceedance. NR = Not Required *Trace Concentration (Estimated Value) ND = Not Detected NE = Not Established due to >50% non-detects ® No sample collected at G-2 this quarter due to low water level No sample collected at G-5 this quarter due to low water level {1} Parameter also detected in one or more quality control blanks. North County RC&SL Public Works/Solid Waste 1 n Semester 2013 Groundwater Monitoring 14 County of San Joaquin-July 25,2013