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TABLE 2 RESULTS FOR VOC AND DUST MONITORING CONDUCTED DURING THE EXCAVATION AT THE SPCC CONTAINMENT STRUCTURE PG&E Former Tracy MGP Site Tracy, California Date Time Location PID Reading* Dust Reading* (ppm) (mg/m3) 10/23/2008 8:05 West 0.0 0.020 10/23/2008 8:35 South 0.0 0.085 10/23/2008 9:11 South 0.1 0.205 10/23/2008 9:35 South 0.1 0.244 Dust Monitor Time Weighted Average for 10/23/2008 = 0.023 mg/m 3 10/27/2008 8:30 North, South, West 0.5 0.050 10/27/2008 9:00 West 0.2 0.050 10/27/2008 9:30 South, West 0.1 0.030 10/27/2008 10:00 South 0.0 0.085 10/27/2008 10:30 West 0.0 0.025 10/27/2008 11:00 West 0.0 0.007 Dust Monitor Time Weighted Average for 10/27/2008 = 0.021 mg/m 3 10/28/2008 8:30 West 0.1 0.055 10/28/2008 8:55 North 0.1 0.079 10/28/2008 9:30 West 0.0 0.055 10/28/2008 9:55 West 0.0 0.155 10/28/2008 10:50 North 0.0 0.085 10/28/2008 11:10 North 0.0 0.055 10/28/2008 12:05 South 0.0 0.045 10/28/2008 12:50 North 0.1 0.039 10/28/2008 14:05 West 0.0 0.019 10/28/2008 14:30 North 0.0 0.025 Dust Monitor Time Weighted Average for 10/28/2008 = 0.022 mg/m 3 * = Identified reading indicates the highest recorded reading at that time and location. North = PID and dust monitoring location immediately north of excavated area. South = PID and dust monitoring location immediately south of excavated area. West= PID and dust monitoring location immediately west of excavated area. VOC =Volatile Organic Compound PID = Photo-ionization Detector(MiniRae 2000) Dust Monitor= MIE pDR-1000 ppm = parts per million Mg/M3 = milligrams per cubic meter Page 1 of 1