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EEC S4114 UniFirst Stockton September 17,2002 At the limits of the excavation, a total of seven soil samples were collected (Figure 3). All seven of these samples were taken independent of regulatory oversight to evaluate soil conditions with respect to petroleum hydrocarbons. Two samples were taken from the north wall of the excavation, one from the east wall, one from the south wall, and one from the west wall. Three samples were collected from the base of the excavation. In addition to the seven soil samples collected above, two confirmation samples were collected under the direction of the SJCEHD. EEC utilized a slide hammer hand sampler to collect the samples from the deepest portion of the excavation(Figure 3). Four samples (approximately one sample per 40 yd3)were collected from the excavated discolored soil to allow for characterization and profiling of the soil for disposal. One sample (SP-3)was collected from the unstained soil. In addition, one sample was collected from within the piping unearthed during excavation activity. Sampling and Analyses Procedures All samples were collected in brass sample sleeves or laboratory grade sample jars. Samples were labeled with the date and time sampled,project number, and unique sample identification number. Samples were placed on iced storage for transport utilizing strict Chain-of-Custody protocol to Cal Tech Environmental Laboratories of Paramount, California. Cal Tech is certified by the State of California to perform the requested analyses. All samples collected during excavation and confirmation testing were analyzed for total petroleum hydrocarbons (TPH)by Environmental Protection Agency Method(EPA) 8015 modified for gasoline and diesel fuel, and for benzene, toluene, ethylbenzene, and xylenes (BTEX) and methyl-tertiary butyl ether(MTBE)by EPA Method 8021. All samples were also analyzed for lead by EPA Method 6010B. Results Excavation Area A total of nine soil samples were collected from within the excavation area independent of agency oversight. The samples contained no detectable concentrations of TPHg, TPHd, BTEX compounds, or lead with the exception of samples EX-3-Wl and S5 which contained a very low concentration of TPHg(0.26 ppm and 0.46 ppm, respectively). Laboratory test results are summarized in Table 1 and the laboratory report is included in the Appendix. Excavation Confirmation Sampling Two soil samples were collected at locations under the direction of the SJCEHD. Laboratory test results of these samples contained no detectable concentrations of TPHg, TPHd, BTEX, or lead. Laboratory test results are summarized in Table 1 and the laboratory report is included in the Appendix. 3