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Table 2 Second Semester 2009 (3rd Quarter 2009) Groundwater Monitoring Results Foothill Sanitary Landfill (Units mg/I unless noted) Sampling Designation MW-1 I MW-2R I MW-3 MW-4 MW-5 Conc. Sampling Date 8/18/09 8/17/09 1 8/18/09 1 8/18/09 8/17/09 Limits Monitoring and Field Parameters Elevations feet TOC Elevation 258.43 299.62 320.75 341.57 256.52 NR Depth to Groundwater 207.80 254.93 272.13 284.14 216.39 NR Groundwater Elevation 50.63 44.69 48.62 57.43 40.13 NR General Water Quality Parameters Temperature �,Cfield NM 22.2 20.4 20.4 22.1 NR H units field NM 7.26 7.39 7.62 7.55 5.8-8.6 Electrical Conductivity NM 199.9 268.7 267.2 260.8 470 uS/cm field Turbidity NTU field NM 21.6 11.1 37.8 8.9 47 Constituents of Concern Calcium NM 16 22 22 22 26 .Magnesium NM 8.5 12 11 11 16 Sodium NM 13 17 15 15 16 Potassium NM 3.3 3.6 4.1 3.7 17 Bicarbonate Alkalinity as NM 100 130 140 130 130 HCO3 Carbonate Alkalinity as NM ND ND ND ND 8 CaCO3 Chloride NM {5.51 8.9 6.6 7.6 9.7 Nitrate as Nitrogen NM 2.5 2.7 1.6 1.8 5.4 Sulfate NM 2.9 6.3 9.4 8.8 9.7 Total Dissolved Solids NM 180 210 210 210 260 Total Cyanide NM ND ND ND ND 0.017 Total Sulfide NM ND ND ND ND 1 Non-Volatile Organic NM {0.25} {0.31) {0.21*) {0.28) 1.2 Carbon Semivolatile Organic Com ounds u /L 4-Chloro-3-meth I henol NM ND 5.0 5.3 ND detect 2-Chlorophenol NM ND 6.2 6.5 ND detect 2-Meth I henol NM ND 5.8 6.1 ND detect 344-Methyl phenol NM ND 12.0 12.0 ND detect 4-Nitrophenol NM ND 6.8 7.2 ND detect Pentachlorophenol NM ND 4.8 5.0* ND detect Phenol NM ND 4.6 4.7 ND detect 2,4,6-Trichloor henol NM ND 1.7 2.0* ND detect All Other Compounds NM ND ND ND ND detect Organophosphorus Pesticides u /L All Com ounds NM ND ND ND ND detect Foothill Sanitary Landfill 16 Department of Public Works/Solid Waste 2nd Semester and Annual 2009 Groundwater Monitoring County of San Joaquin-January 31,2010