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TABLE 3 FIRST QUARTER 2012 GROUNDWATER MONITORING RESULTS NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL (Units mg/1 unless noted) Sampling G-1 G-2 G-3D G-4 G-5 G-6 Conc. Designation Limits Sampling Date 1/9/12 1/9/12 1/9/12 1/9/12 1/9/12 1/9/12 Monitoring and Field Parameters Elevations feet -Top of Casing 120.95 NM 114.06 117.35 111.18 114.41 NR Depth to 164.38 150.68 156.37 159.84 153.46 157.03 NR Groundwater Groundwater -43.43 NM -42.31 -42.49 -42.28 -42.62 NR Elevation General Water Qualitv Parameters -Temperature °C 20.1 NS 17.3 14.4 NS 13.7 NR H units 7.18 NS 7.64 7.51 NS 7.16 6.0-8.0 Electrical 403.5 NS 201.8 159.6 NS 224.7 550 -Conductivity uS/cm -Turbidity NTU) 26.9 NS 9.7 10.6 NS 11.6 21 Dissolved Oxygen 1.86 NS 1.71 1.70 NS 1.49 1 Redox Potential -17 NS +156 +139 NS +152 1 Ask Constituents of Concern Calcium 18 NS 15 11 NS 18 30 Magnesium 9.6 NS 8.7 6.1 NS 9.5 23 Sodium 45 NS 15 14 NS 15 32 Potassium 26 NS 3.7 2.6 NS 3.5 7 Bicarbonate Alkalinity 200 NS 100 76 NS 110 180 Total Alkalinity as 190 NS 84 62 NS 92 1 CaCO3 Chloride 8.2 NS 6.4 6.6 NS 7.6 80 Nitrate as N 1.4 NS 1.4 1.1 NS 1.2 4 Sulfate 3.7 NS 3.0 3.5 NS 3.2 30 Hardness as CaCO3 84 NS 72 52 NS 83 1 Total Dissolved 460 NS 180 140 NS 180 310 Solids - Chemical Oxygen 8,8* NS ND ND NS ND I Demand Volatile Organic Com ounds82608 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"Semester 2012 Groundwater Monitoring 13 County of San Joaquin-July 26,2012