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Ms.Julie Shortridge <br /> ARCADIS BBL <br /> September 14,2007 <br /> Prior to drilling and soil sampling, proposed soil sampling locations will be cleared for underground <br /> utilities by a qualified private utility locator. In addition to clearing locations for underground <br /> obstructions (including utility lines),the private utility locator will attempt to trace any oil-containing <br /> pipelines in the vicinity of the identified key oil handling features (listed above). If such pipelines are <br /> traced to suspect areas not included in the current sampling approach, additional soil sampling may <br /> be proposed. Once the proposed sampling locations have been marked onsite, Underground <br /> Service Alert will be notified. <br /> Soil sampling will be completed using a hand auger and Geoprobe direct-push rig. The hand auger <br /> will be utilized for sampling in the upper 5 feet at each location as a safety precaution for <br /> underground utility lines that may not have been identified during utility clearance activities. If <br /> locations are sufficiently close to electrical equipment (as determined by the onsite PG&E <br /> electrician), the hand auger maybe used to complete the boring beyond the initial 5-foot depth. At <br /> locations with adequate distance from electrical equipment, the Geoprobe direct-push rig will be <br /> used to collect samples to the target depths. <br /> At this time, utility clearance activities are planned for the week of September 17, 2007. Sampling <br /> activities are currently scheduled to begin on October 8, 2007, and have an estimated duration of <br /> two to three weeks. <br /> If you have any questions or comments regarding these workplan summaries, please do not hesitate <br /> to contact me at(925) 215-4601. <br /> Sincerely, <br /> Terra Pacific Group Incorporated <br /> L <br /> Rick McCartney <br /> Principal <br /> Attachments: Workplan summaries for each substation site <br /> Tables 1 through 7 presenting sampling program and sampling rationale <br /> Figures for each substation site <br /> Page 2 <br /> TERRA PACIFIC GROUP <br />