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® Table 1 - Continued <br /> Third Quarter 2012 Groundwater Monitoring Results —Shallow Aquifer <br /> Corral Hollow Sanitary Landfill <br /> (Units mg/I unless noted) <br /> Monitoring Point MW-9A MW-10A MW-11A <br /> Monitoring Date Date Conc. Date Cone. Date Cone. <br /> 7/16/12 Limit 7/16/12 Limit 7/16/12 Limit <br /> Monitoring and Field Parameters <br /> Elevations(feet] <br /> TOC Elevation 298.18 NR 281.05 NR 265.72 NR <br /> Depth to Groundwater 81.41 NR 73.76 NR 43.54 NR <br /> Groundwater Elevation 216.77 NR 207.29 NR 222.18 NR <br /> General Water Oualitv Parameters <br /> Temperature(°C)(field 23.10 NR 22.4 NR 23.2 NR <br /> H(units)(field) 7.83 I 7.23 I 6.99 I <br /> Electrical Conductivity 1116 1 1064 1 1247 1 <br /> (uS/cm)(field <br /> Turbidity(NTU)(field) 67.3 I 74.6 I 68.6 I <br /> Constituents of Concern <br /> Bicarbonate Alkalinity 110 I 110 I 680 I <br /> as HCO3 <br /> Carbonate Alkalinity ND I ND I ND I <br /> as CaCO3 <br /> Total Alkalinity as 92 I 93 I 560 I <br /> CaCO3 <br /> Chloride 130 I 110 I 93 I <br /> Nitrate as Nitrogen 34 I 27 I 2.5 I <br /> Sulfate 17 I 24 I 63 I <br /> Total Dissolved Solids 660 I 520 I 860 I <br /> Volatile Organic Compounds*8260B u <br /> Benzene ND detectND detect 0.14* detect <br /> Dichlorodifluoromethane ND detect 0.94 detect 0.74 detect <br /> Tetrachloroethene ND detect 0.49* detect 0.18* detect <br /> All Other Compounds ND detect ND detect ND detect <br /> NR=Not Required ND=Not Detected <br /> NE=Not established,due to>50%non-detects NT=Not Tested <br /> MCL=Maximum Contaminant Levels NL=Not Listed <br /> NS=Not statistically significant deer=significantly decreasing trend <br /> I=Insufficient data for statistical analysis incr=significantly increasing trend <br /> Underlined values indicate a concentration limit exceedance. Bold values indicate a detected organic compound. <br /> [1] Not established due to statistically significant increasing trend. Concentration limit from WDRs. <br /> *Trace Concentration(estimated value) <br /> {}=Parameter also detected in one or more quality control blanks <br /> Corral Hollow Sanitary Landfill 19 Department of Public Works/Solid Waste <br /> 3rd Quarter 2012 Groundwater Monitoring County of San Joaquin—October 30,2012 <br />