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Table 1 - Continued <br /> Second Quarter 2012 Groundwater Monitoring Results—Shallow Aquifer <br /> Corral Hollow Sanitary Landfill <br /> (Units mg/l unless noted) <br /> Monitoring Point MW-9A NM-l0A MW-11A <br /> Monitoring Date Date Conc. Date Cone. Date Cone. MCLs <br /> 5/21/12 Limit 5/21/12 Limit 5/21/12 Limit MG/L <br /> Monitoring and Field Parameters <br /> Elevations(feet) <br /> TOC Elevation 298.18 NR 281.05 NR 265.72 NR NR <br /> Depth to Groundwater 81.51 NR 73.75 NR 43.35 NR NR <br /> Groundwater Elevation 216.67 NR 207.30 NR 222.37 NR NR <br /> General Water Oualitv Parameters <br /> Temperature(°C)(field 21.9 NR 21.8 NR 21.5 NR NR <br /> H(units)(field) 7.81 I 7.84 I 7.03 I 6.5-8.5 <br /> Electrical Conductivity 800.1 1 803.3 1 1,198 1 900 <br /> (uS/cm)(field <br /> Turbidity(NTU)(field) 37.7 I 41.9 1 41.7 I NL <br /> Constituents of Concern <br /> Calcium 61 I 54 I 130 I NL <br /> Magnesium 23 I 18 I 43 I NL <br /> Sodium 94 I 88 I 160 I NL <br /> Potassium 8.7 I 5.3 I 7.5 I NL <br /> Bicarbonate Alkalinity 120 I 110 I 640 I NL <br /> as HCO3 <br /> Carbonate Alkalinity ND I ND I ND I NL <br /> as CaCO3 <br /> Total Alkalinity as 95 I 90 I 530 I NL <br /> CaCO3 <br /> Chloride 140 I 130 I 110 I 250 <br /> Nitrate as Nitrogen 34 I 26 I 2.9 I 10 <br /> Sulfate 21 1 26 I 68 I 250 <br /> Total Dissolved Solids 600 I 510 I 870 I 500 <br /> Total Cyanide ND I ND I ND I 0.2 <br /> Total Sulfide ND I ND I ND I NL <br /> Non-Volatile Organic 12 I 1.3 I 3.5 I NL <br /> Carbon <br /> Organo-Phosphorus Pesticide (EPA Method 8141 <br /> All Compounds ND detect ND detect ND detect NR <br /> Chlorinated Herbicides EPA Method 8151 <br /> All Compounds ND detect ND detect ND detect NR <br /> I + <br /> SemiVolatile Or anic Com ounds PA Method 8270 C <br /> All Compounds ND detect ND detect ND detect NR <br /> Corral Hollow Sanitary Landfill 19 Department of Public Works/Solid Waste <br /> 20°Quarter 2012 Groundwater Monitoring County of San Joaquin—July 30,2012 <br />