SITE INFORMATION AND CORRESPONDENCE

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M. Scott Mansholt - 3 - • 16 April 2009 Former Lyoth Loading Station data concluded that the remaining constituents on the Site do not pose an unacceptable health risk to either onsite residents or future construction workers. A subsequent risk evaluation by SAIC concluded that direct contact exposure by potential future commercial/industrial workers and construction/trench workers does not pose an unacceptable threat. SAIC conducted a well survey for the project by reviewing Department of Water Resources (DWR) records. There is no DWR record of private, domestic, or public water wells located on the Site. Future use of Site groundwater is not anticipated due to low yield from low permeability soil, poor quality, and the availability of alternative water supplies as documented by file information. According to the findings provided in Site characterization reports, Central Valley Water Board staff concur that the extent of impacted soil and groundwater is limited and has been adequately delineated. Review of the data indicate that use of the historical crude oil pipelines ceased over 30 years ago and that residual petroleum hydrocarbons as crude oil remaining in the soil, do not constitute a significant source of petroleum constituents. Central Valley Water Board staff concur with the summary provided in the No Further Action Required Request for the former Lyoth Loading Station and that the property is a candidate for closure. The Central Valley Water Board is required to provide the public the opportunity to comment on closure decisions under state law (including Health and Safety Code 25356.1). Central Valley Water Board staff are increasing efforts to include public participation in its site closure programs. As part of this effort, Central Valley Water Board staff will be notifying nearby landowners, residents, and occupants of closure cases we oversee. Pursuant to Section 2728 of the California Code of Regulations, Title 23, Division 3, Chapter 16, the Central Valley Water Board requests that you conduct a property and offsite property owner survey (Survey). The Survey should determine: a) all properties overlying soil and groundwater determined to have been impacted by the historical pipelines' release, and b) adjacent properties within a 500-foot radius of the impacted areas delineated at the Site. The Survey should include assessors' parcel maps for the properties. Upon completion, submit a table or spreadsheet listing property owner names and mailing addresses, business and residence mailing addresses, and assessors' parcel numbers and maps. By 15 June 2009, please submit the results of the Survey and a site specific SMP. Following completion of a 30-day public notice period and provided any substantive comments are resolved, Chevron will be notified that the onsite monitoring wells can be destroyed. Upon verification of proper monitoring well destruction, the Central Valley Water Board will issue a No Further Action determination.