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Mr.Harlin Knoll January 31,2003 Work Plan for Vertical Assessment USA Service Station No. 65 Page 3 The proposed scope of work has been subdivided into Tasks 1 through 4. All geologic work will be conducted under the direct supervision of a State of California Registered Geologist and will be conducted in accordance with standards established by the Tri- Regional Board Guidelines for Hydrocarbon Site Assessment and Remediation (RWQCB 1991) and San Joaquin County PHS/EHD guidelines. Stratus' Field Practices and Procedures are presented in Appendix A Task 1: Prefield Activities Following approval of the work plan by San Joaquin PHS/EHD, the following activities will be implemented: • Obtain an access agreement from the property owner south of the USA facility, • Update the site-specific Health and Safety Plan, • Secure a permit from San Joaquin County PHS/EHD to advance the soil borings, • Schedule a C-57 licensed contractor to complete the work, and • Mark the proposed well locations and notify Underground Service Alert, USA Gasoline Corporation, and San Joaquin County PHS/EHD of the scheduled field activities. Task 2: CPT Borings Stratus will oversee a California licensed drilling contractor advance three CPT borings (two onsite and one offsite) to an approximate depth of 100 feet bgs. The proposed locations of the borings are shown on Figure 2. The actual locations of the borings will be based on accessibility and the location of underground utilities. The proposed method of assessment involves the use of an electronic piezocone advanced in one boring to provide a continuous log of the soil profile, while an adjacent boring, created by a direct push method, allows for collection of discrete groundwater(Hydropunchrm) samples. The CPT consists of advancing a cone-tipped cylindrical probe (1.7 inches in diameter) into the ground while simultaneously measuring the resulting resistance to penetration. A computer generated CPT log is plotted in the field, providing a continuous log of site lithology. Upon completion of sampling, the CPT hole will be grouted from the bottom of the borehole up to surface grade. Following the CPT work, groundwater samples will be collected from a separate boring located approximately two feet from the initial CPT boring. A minimum of three groundwater samples will be collected from each of the direct push borings. PAUSA Gasoline1Ob651Workplanslusa65-cpt-workplan.doc STRATUS