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Vestar Development Company D47223.01 March 7, 2006 Page 3 • The soil samples collected from the surface and at 5 feet bsg in the boring adjacent to the natural gas well will be analyzed for total range petroleum hydrocarbon(TRPH)using United States Environmental Protection Agency(US EPA)Method 8015 modified,CAM 17 metals, and volatile organic compounds (VOCs)using US EPA Method 8260. • The soil collected from surface and at 5 feet bsg in the boring adjacent to the plastic AST will be analyzed for TRPH using US EPA Method 8015 modified, CAM 17 metals,VOCs using US EPA Method 8260, Organochlorine pesticides using US EPA Method 8081, Organophosphate pesticides using US EPA Method 8141, and Chlorinated Phenoxy Acid herbicides using US EPA Method 8151; and • Prepare a summary report documenting the investigative procedures and summarizing the field and laboratory analytical findings, conclusions, and recommendations. 4.0 PROPOSED INVESTIGATIVE PROCEDURES This site assessment will consist of a field investigation, a laboratory testing program, and preparation of a summary report. This work plan and the activities summarized below are intended to be consistent with the requirements of the SJCDEH. Standard operating procedures (SOPS), relevant to the field and laboratory activities, are included in Appendix A. 4.1 Permitting: Twining intends to submit this work plan for review and approval by the SJCDEH in order to obtain the appropriate permits to conduct the proposed investigation. SJCDEH soil boring permit applications will be submitted with this work plan. This work is being conducted as part of a property transaction and proposed redevelopment and not at the direction of any regulatory agency. 4.2 Field Investigation: The field investigation will consist of drilling soil borings and collecting soil samples for analysis. 4.2.1 Soil Boring_Locations and Soil Sampling: Twining proposes to drill up to twenty-one soil borings (B1 through B21)to 15 feet bsg to investigate soil conditions along the property boundary of the former asbestos dumpsite, in the area of the natural gas well, and in the area of the plastic AST. The soil borings will be drilled using a direct push, GeoprobeO,portable drill rig consistent with the SOPs in Appendix A. Soil boring locations will be marked and the Underground Service Alert (USA) network will be notified at least 48 hours prior to commencing field work. The proposed soil boring locations are shown on Drawing 2. Soil samples will be collected in the soil borings at 5-foot intervals starting at the surface in soil borings B 1 through B21. Soil samples collected from each of the soil borings will be field screened consistent with our SOPS provided in Appendix A. Field screening procedures include observation of the soil for lithologic data, odor, and unusual stains. Soil samples will be preserved in the field for laboratory analysis consistent with our SOPS. The final soil boring locations and depths may be adjusted in the field based on field screening results. The analytical results of soil samples collected from the soil borings along the property boundary of the former asbestos dumpsite are expected to provide data on the presence of asbestos in subsurface - soil along the site boundary adjacent to the.former asbestos dumpsite. The analytical results of the soil samples collected in the area of the natural gas well are expected to provide data on the presence