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Phase I Environmental Site Assessmehhdate V Page 4 Teixeira-Souza Property—Villages D2,D3,and D4 October 27,2006 WKA No.: 5475.10 Former Shell Central Valley Crude Oil Pipelines The California Regional Water Quality Control Board (RWQCB) Spills, Leaks,Investigations, and Cleanups database revealed one facility, the Former Shell Central Valley Crude Oil Pipelines(Shell Pipelines), located approximately 800 feet southwest of the southern comer of the Village D3 Subdivision. This facility is currently undergoing an investigation regarding known unauthorized release(s) of hazardous materials. A large excavation in conjunction with the investigation is taking place immediately west of the Teixeira-Souza Property boundary of Parcel 209-450-14. The Shell Pipelines facility was previously discussed in WKA's September 6, 2006 Phase I Environmental Site Assessment Update for the Mountain House Teixeira-Souza Property, Villages D2 and D4. Mr. Mark Clardy,the RWQCB representative providing oversight to the cleanup process,was interviewed on October 25, 2006 to update information on the status of the pipeline investigation. The last time that Mr. Clardy was interviewed,he stated that the listed facility was undergoing a soil and groundwater investigation by SAIC,Ino, (SAIC)to determine the most effective remediation measures and also to evaluate any potential impact to groundwater. During the most recent interview, Mr. Clardy stated that excavation to 15 feet below ground surface had been ongoing for the past month and that multiple areas had been found to contain petroleum contamination in excess of what SAIC had expected to find. The areas with higher- than-expected levels of contamination were excavated to 20 feet below ground surface, or just above the water table. At the time of the most recent interview with Mr. Clardy,none of the groundwater monitoring wells or leachability tests that were proposed in SAIC's July 18,2006 Investigation Workplan have been performed at the facility. In summary, no new agency-listed facilities were identified relative to the previous assessments for the site. The site was not encountered on any of the reviewed agency lists, as stated in the previous reports and based on the new(current) agency database search by EDO. Data Gans The historical research presented in the initial Phase I ESA documented the site conditions back to 1914. The time intervals between several of the reviewed Standard Historical Sources exceeds the minimum five-year period and therefore represent data gaps. However,these data gaps are not considered significant in terms of identifying RECs related to the site since the overall use of the site during the years where the data gaps were identified has not changed significantly over time. No other data gaps were discovered that would hinder identification of RECs on the site. `K WALLACE•KUHL &ASSOCIATES INC.