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TABLE 2 <br /> Foothill Sanitary Landfill <br /> Second Semester 2006 Groundwater Monitoring Results <br /> Units m /l unless noted <br /> Sampling Designation MW-1 MW-2R LW-1 MW-3 Conc. <br /> Sampling Date 07/27/06 07/27/06 07/27/06 07/27/06 Limit <br /> Monitoring and Field Parameters <br /> Elevations <br /> Top of Casing Elevation (ft) 256.25 269.95 318.32 NR <br /> Depth to Groundwater(ft) 205.84 254.46 38.64 271.82 NR <br /> Groundwater Elevation (ft) 50.41 15.49 46.50 NR <br /> General Water Quality Parameters <br /> Temperature (°C) (field) 21.5 21.5 19.6 21.5 NR <br /> Chloride 6 6 11 10 9.9 <br /> Nitrate - Nitrogen 2.9 2.3 1.0 3.0 6.8 <br /> Total Dissolved Solids 206 193 228 229 280 <br /> Sulfate 5 3 16 6 11 <br /> pH (units) (field) 7.14 7.38 6.80 7.14 5.8-9.2 <br /> Electrical Conductivity(µS/cm) (field) 358 368 146 341 530 <br /> Turbidity(NTU) (field) 12.6 9.6 6.1 12.7 48 <br /> Calcium 22.8 17.5 29.2 25.6 32 <br /> Potassium 3.48 3.86 4.64 3.8 20 <br /> Magnesium 11.2 7.94 11.6 13.1 26 <br /> Sodium 12.9 13.3 13.9 17.9 19 <br /> Alkalinity, Carbonate 8* 3* 3* 4* NE [1] <br /> Alkalinity, Bicarbonate 88 85 104 112 130 <br /> Total Alkalinity 96 85 104 116 130 <br /> ' Volatile Organic Compounds (ug/L) <br /> Trichloroethene (TCE) ND ND ND 0.18* detect <br /> All Other Compounds ND ND ND ND detect <br /> [1] Not established due to >50% non-detects <br /> ND = Not detected <br /> NR = Not required <br /> NE = Not established due to insufficient data <br /> * Trace concentration (estimated value) <br /> Bolded values indicate VOC detections, underlined values indicate concentration limit exceedances <br /> { )=Compound was also found in laboratory control blanks <br /> LW-1 sampling/testing is not part of monitoring program <br /> t <br /> Foothill Sanitary Landfill 1 1 Department of Public Works/Solid Waste <br /> 2"d Semester Groundwater Monitoring County of San Joaquin-January 31,2007 <br />