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E INC The local subsurface sediments in the vicinity of the Hi Hopes property have been determined by previous WZI investigations in the area (WZI, 1996b) to generally consist of a heterogeneous mix of interbedded, poorly graded to well graded sand, silty sand, sandy silt, sandy clay, and clay The silty sand and poorly graded sand generally contain fine-grained, subrounded, quartz grains with mica The well graded sands consist of subangular to subrounded quartz, feldspar, and lithic fragments 4.3 Exploratory Soil Borings Prior to submission of a final vadose zone site assessment workplan to PHSEHD, WZI prepared a site health and safety workplan This health and safety plan was incorporated as Appendix I of this report Four exploratory soil borings were drilled in the vicinity of the former Tank#1 location with the objective of identifying the overall vertical and horizontal extent of soil hydrocarbon contamination and to characterize the nature of the hydrocarbon contamination One exploratory soil boring was drilled at the former Tank #2 location to confirm all soil contamination had been removed when the tank was excavated Exhibit 5 depicts the locations of the borings and Appendix II contains logs of the individual borings Appendix III provides of description of the soil boring soil sampling protocol used to collect, label, and transport the soil samples Appendix IV presents the soil sample chain of custody and analytical laboratory results Table 2 is a summary of the analytical laboratory results of the exploratory soil borings The soil borings were drilled on August 3 and 4, 1996 by V&W Drilling utilizing an 8" hollow stem flite auger The drilling and soil sample collection was conducted under the supervision of a WZI California registered geologist The information obtained from the soil borings can be summarized as follows (1) lithology present below the former tank sites is comprised primarily of fine to coarse grained sand with minor interbedded silt and clay, (2) lithology present conforms with previously described geologic units for the Lodi area in the upper 100 feet of the subsurface, (3) the gasoline impacted soil was present 08220010 011 27