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Table 2 <br /> ® Fourth Quarter 2012 Groundwater Monitoring Results — Deep Aquifer <br /> Corral Hollow Sanitary Landfill <br /> (Units mg/l unless noted) <br /> Monitoring Point MW-6 MW-7 <br /> Date Cone. Date Cone. <br /> Monitoring Date <br /> 10/15/12 Limit 10/15/12 Limit <br /> Monitoring and Field Parameters <br /> Elevations(feet) <br /> TOC Elevation303.33 NR 256.48 NR <br /> -- -...---..__.._...-.._...........-----.._.__...- ---- - -----------------... - -----...,..--—._.._._.. --- ----- <br /> Dept to Groundwater 359.03 NR 303.97 NR <br /> --— --------- - -----------._.— _ ------r------- — -- <br /> Groundwater Elevation -55.70NR -47.49 NR <br /> General Water Quality Parameters <br /> 0 22.70 NR 21.70 NR <br /> Temperature( C)(field) _..__..__.....------._._.-.._...__. .—..,— <br /> H units field 7.79 3.4-8.4 7.56 4.9-8.3 <br /> Electrical Conductivi uS/em field 1075 2,000 1530 1,600 <br /> Turbidity(NTU) field — 12.3 74 33.8 57 <br /> Constituents of Concern _ <br /> Chloride 94 140 160 190 <br /> Nitrate as Nitrogen 2.0 8.2 -- 4.6 --- 6.1 <br /> Sulfate 260 _330 370 440 <br /> Total Dissolved Solids 700 810 1100 1100 <br /> Volatile Organic Com ounds_*8260B)(ug L _ <br /> All Compounds 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 23 Department of Public Works/Solid Waste <br /> 4"i Quarter and Annual 2012 Groundwater Monitoring County of San Joaquin-January 15,2013 <br />