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WORK PLAN FOR ADDITIONAL SITE ASSESSMENT FORMER SHELL STATION 2575 Country Club Boulevard, Stockton, CA pending sampling activities at the Site at least 48 hours prior to commencement of work. Prior to drilling, the borehole location will also be cleared by a geophysical survey. Soil samples will be collected at depths of 10 and 12 feet (2 soil samples). These sample depths are below the floor of the waste oil UST excavation. The soil samples will be collected by advancing the hand auger to the desired depth, then driving a split barrel sampler lined with a 6-inch stainless steel or brass tube into undisturbed soil with a slide hammer. Upon recovery, each end of the tube will be covered with Teflon tape and sealed with plastic end caps. A portion of soil from each sample interval will be examined in the field for observable signs of petroleum hydrocarbons and for soil classification. Soil will be classified in general accordance with the Unified Soil Classification System. The soil classification and description, including grain size, subordinate constituents, color, density, and moisture content will be recorded on a boring log. Organic vapor monitoring for the emissions of volatile organic compounds (VOCs) from freshly exposed soil from each sample interval will be performed in the field using a portable photo- ionization detector (PID) calibrated to hexane. A portion of the soil from each sample interval will be placed in a ZipLoci% bag. and allowed to sit undisturbed for approximately 10 minutes. The PID probe will then be inserted into the bag and the organic vapor content of the headspace will be measured. This reading will be recorded on the boring log. All drilling and soil sampling activities will be performed in accordance with WPI's site-specific Health and Safety Plan and under the supervision of a California Professional Geologist. 3.4.3 Decontamination Procedures All down-hole drilling and sampling equipment will be cleaned prior to first use and after each sampling event using a solution of non-phosphate soap and tap water, followed by a rinse in tap water then de-ionized water. 3.4.4 Laboratory Analyses Soil samples will be transported and submitted under chain-of-custody to a state-certified laboratory for analyses. All samples will be analyzed for polycyclic aromatic hydrocarbons (PAHs) by EPA method 8270C/D. 3.4.5 Reporting Data collected during this phase of assessment will be evaluated and presented in a report that includes the following: Objectives and background; Documentation of field activities; Discussion of results; Conclusions and Recommendations; Page 5