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Table 1 - Continued <br /> First Quarter 2013 Groundwater Monitoring Results —Shallow Aquifer <br /> Corral Hollow Sanitary Landfill <br /> (Units mg/1 unless noted) <br /> Monitoring Point MW-9A MW-l0A MW-IIA <br /> Monitoring Date Date Conc. Date Conc. Date Conc, <br /> 1/28/13 Limit 1/28/13 Limit 1/28/13 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 82.98 NR 73.90 NR 43.97 NR <br /> Groundwater Elevation 215.20 NR 207.15 NR 221.75 NR <br /> General Water Quality Parameters <br /> Temperature(°C)(field) 17.4 NR 17.8 NR 19.20 NR <br /> H units (field) 7.84 I 7.81 I 7.00 I <br /> Electrical Conductivity 854.9 1 771.1 1 1311 1 <br /> (uS/cm)(field) <br /> Turbidity(N (field) 58.3 1 74.8 I 37.7 1 <br /> Constituents of Concern <br /> Bicarbonate Alkalinity 110 I 110 1 630 1 <br /> as HCO3 <br /> Carbonate Alkalinity as ND I ND I ND I <br /> CaCO3 <br /> Chloride 120 I 100 I 91 1 <br /> Nitrate as Nitrogen 36 1 27 I 2.4 I <br /> Sulfate 15 I 24 I 66 I <br /> Total Dissolved Solids 590 I 470 I 770 I <br /> Calcium 66 I 51 1 110 1 <br /> Magnesium 18 I 15 1 34 I <br /> Sodium 62 I 66 1 I 120 I <br /> Potassium 5.1 I 3.7 I 4.2 I <br /> Volatile Organic Com ounds *8260B (ugjJ <br /> CIS-1,2-Dichloroethene ND detect ND detect 0.67 detect <br /> 1,2-Dichloro ro ane ND detect ND detect 0.16* detect <br /> Trichlorofluoromethane ND detect 0.21* detect ND detect <br /> Dichlorodifluoromethane ND detect 1.4 detect ND detect <br /> Trichloroethene ND detect ND detect 0.15* detect <br /> Tetrachloroethene ND I detect 0.44* detect 0.26* 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 /> (I=Parameter also detected in one or more quality control blanks <br /> Corral Hollow Sanitary Landfill 20 Department of Public Works/Solid Waste <br /> I"Quarter 2013 Groundwater Monitoring County of San Joaquin—April 15,2013 <br />