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A <br /> Work Plan For Limited Subsurface Investigation—'Tosco(Former BP)Service Station No. 11195 <br /> October 15,2001 <br /> Task 1. Pre-Field Activities <br /> GR will prepare a site-specific safety plan, and obtain the necessary drilling permit from the PHS- <br /> EPD. GR will assist Tosco in obtaining access to the offsite probing locations. The proposed <br /> Geoprobe locations will be marked and a private utility line locator will be contracted to locate <br /> subsurface utilities near the proposed Geoprobe locations. Underground Service Alert(USA)will be <br /> notified a minimum of 48 hours prior to drilling. <br /> Task 2. Boring Installation <br /> GR will install five Geoprobes at the locations shown on Figure 2. Probing activities will be <br /> performed by a California-licensed driller(C-57 license). A GR geologist will observe drilling,collect <br /> soil samples for lithologic description and chemical analysis, prepare boring logs, and collect <br /> groundwater samples for chemical analyses. The probes will be advanced using a Geoprobe rig <br /> utilizing direct push technology. <br /> Soil samples for lithologic description and possible chemical analysis will be collected continuously <br /> to develop an accurate profile of subsurface hydrogeologic conditions. Soil from selected sample <br /> intervals will be screened in the field for the presence of volatile organic compounds using a <br /> photoionization detector(PID). These data will be collected for reconnaissance purposes only, and <br /> will not be used as verification of the presence or absence of petroleum hydrocarbons. Screening data <br /> will be recorded on the boring logs. <br /> Selected soil samples will be submitted for chemical analyses. Although the actual number of samples <br /> submitted for chemical analysis will depend on site conditions and field screening data, we anticipate <br /> a minimum of one soil sample, from the soil/groundwater interface, will be submitted for chemical <br /> analysis as described in Task 4. <br /> Drill cuttings will be stockpiled at the site pending disposal. Stockpiled cuttings will be placed on and <br /> covered with plastic sheeting. Four soil samples from the drill cuttings will be collected for disposal <br /> characterization as described in Appendix A. These samples will be submitted to the laboratory for <br /> compositing into one sample,then analyzed as described in Task 4. Drill cuttings will be transported <br /> by a Tosco-approved hauler to Forward Landfill, located in Manteca, California. <br /> Task 3. Groundwater Sampling <br /> A grab groundwater sample will be collected form each Geoprobe location in accordance with GR <br /> Field Methods and Procedures(Appendix A). The groundwater samples will be analyzed as described <br /> in Task 4. <br /> Task 4. Laboratory Analyses <br /> All samples will be submitted to a California-certified Hazardous Materials Testing Laboratory. <br /> Selected soil and groundwater samples will be analyzed for total petroleum hydrocarbons as gasoline <br /> (TPHg) by Environmental Protection Agency (EPA) Method 8015/Modified, benzene, toluene, <br /> 140193.11-1 <br /> 5 <br />