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Table 3 Second Semester 2009 (4th Quarter 2009) Groundwater Monitoring Results Foothill Sanitary Landfill (Units mg/l unless noted) Sampling Designation MW-1 MW-2R MW-3 MW-3 MW-4 MW-4 MW-5 Conc. Resam led Resam led Sampling Date 10/8/09 10/7/09 10/8/09 11/2/09 10/8/09 11/2/09 10/8/09 Limits Monitoring and field Parameters Elevations feet TOC Elevation 258.43 299.62 320.75 320.75 341.57 341.57 256.52 NR Depth to Groundwater 208.02 255.08 272.48 272.68 284.58 284.59 216.42 NR Groundwater Elevation 50.41 44.54 48.27 48.07 56.99 56.98 40.10 NR General Water Qualitv Parameters Temperature '. field NM 18.6 18.1 20.2 16.7 19.6 20 NR H units field NM 7.44 7.28 7.24 7.11 7.16 6.98 5.8-8.6 Electrical Conductivity NM 219.3 274.3 277.3 267.6 261.4 261.7 470 uS/cm field Turbidity NTU field NM 11.4 28.3 16.3 39.3 34.7 13.3 47 Constituents of Concern Calcium NM NM NM NM 23 NM NM 26 Magnesium NM NM NM NM 12 NM NM 16 Sodium NM NM NM NM 15 NM NM 16 tassium NM NM NM NM 4.2 NM NM 17 icarbonate Alkalinity as NM NM NM NM {140} NM NM 130 HCO3 Carbonate Alkalinity as NM NM NM NM ND NM NM 8 CaCO Chloride NM NM NM NM 5.8 NM NM 9.7 Nitrate as Nitrogen NM NM NM NM 1.6 NM NM 5.4 Sulfate NM NM NM NM 7.9 NM NM 9.7 Total Dissolved Solids NM NM NM NM 220 NM NM 260 Semivolatile Organic Com ounds u /1- 4-Chloro-3- NM NM NM ND NM ND NM detect meth henol 2-Chlorophenol NM NM NM ND NM ND NM detect 2-Methylphenol NM NM NM ND NM ND NM detect 3-&4-Meth I henol NM NM NM ND NM ND NM detect 4-Nitrophenol NM NM NM ND NM ND NM detect Pentachlorophenol NM NM NM ND NM ND NM detect Phenol NM NM NM ND NM ND NM detect 2,4,6-Trichloor henol NM NM NM ND NM ND NM detect All Other Compounds NM NM NM NM NM NM NM detect 0 Foothill Sanitary Landfill 18 Department of Public Works/Solid Waste 2'd Semester and Annual 2009 Groundwater Monitoring County of San Joaquin-January 31,2010