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TABLE 2 <br /> FOOTHILL SANITARY LANDFILL <br /> SECOND SEMESTER 2007 GROUNDWATER MONITORING RESULTS <br /> (Units mg/I unless noted) <br /> Sampling Designation MW-1 MW-2R MW-3 MW-4 MW-5 Conc. <br /> Sampling Date 7/23/07 7/23/07 7/23/07 7/23/07 7/23/07 Limits <br /> TOC Elevation 258.43 299.62 320.75 TBD TBD NR <br /> Depth to Groundwater 206.02 254.34 271.34 283.07 215.74 NR <br /> Groundwater Elevation 52.41 45.28 49.41 NR <br /> Temperature (-C) 20.8 21.6 21.2 23.5 24.9 NR <br /> field <br /> Chloride 5.8 5.6 9.6 6.8 8.8 9.8 <br /> Nitrate as Nitrogen 2.8 2.5 2.9 1.6 1.6 6.7 <br /> Total Dissolved Solids 73 160 200 193 184 280 <br /> Sulfate 4.9 1.7 6 9.2 9.9 11 <br /> H units field 7.18 7.1 7.22 7.61 7.76 5.8-9.1 <br /> Electrical Conductivity 219 194 258 266 258 530 <br /> uS/cm field <br /> Turbidity NTU field 11.64 8.41 11.3 48.1 29.7 48 <br /> Calcium 19 16 22 21.6 21.1 30 <br /> Magnesium 9.9 7.9 11 10.9 10.6 25 <br /> Potassium 3.1 3.1 3.5 4.23 3.68 19 <br /> Sodium 11 11 16 15 14.8 18 <br /> Bicarbonate Alkalinity 48 97 130 113 106 130 <br /> Carbonate Alkalinity as ND ND ND ND ND 120 <br /> CaCO3 <br /> Sulfide NR NR NR 0.09 ND 2 <br /> Total Organic Carbon NR NR NR 0.24* 0.09" 1.2 <br /> for 5-year COC TOC <br /> Volatile Organic Compo nds (ug/ <br /> Acetone 7.5* 14 6.6* ND ND detect <br /> Trichloroethene(TCE) ND ND 0.60 ND ND detect <br /> All Other Compounds ND ND ND ND ND detect <br /> ND = Not Detected <br /> NE =Not Established due to> 50% non-detects <br /> NR= Not Requested <br /> [1] = Not Established due to > 50% non-detects <br /> *=Trace concentration (estimated value) <br /> {}= Parameter also detected in one or more quality control blanks <br /> TBD =To be determined <br /> Foothill Sanitary Landfill 14 Department of Public Works/Solid Waste <br /> 2nd Semester and Annual 2007 Groundwater Monitoring County of San Joaquin-January 31,2008 <br />