SITE INFORMATION AND CORRESPONDENCE

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M. Scott Mansholt - 4 - 3 April 2008 Mountain House Site #1 It is likely that activities at the site will be limited to construction/trench workers; an environmental risk evaluation demonstrated that residual TPHc does not pose a health risk for future construction/trench worker(s); and, In accordance with SWRCB Resolution No. 92-49, SAIC has demonstrated that readily available alternative remedial options are infeasible, very costly, and that natural attenuation is the most practical and viable option for the site. If existing, additional, or previously unidentified chemical constituents at the site cause or threaten to cause pollution or nuisance or are found to pose a threat to public health or water quality, then 1) nothing in this determination is intended or shall be construed to limit or preclude the Regional Water Board or any other agency from taking any further enforcement action, and 2) this letter does not relieve Chevron of any responsibilities mandated under the California Health and Safety Code and the California Water Code. By 20 June 2008, please provide the Soil Management Plan (SMP) for the site. The SMP serves as a guideline for Chevron to implement for the handling, reuse, and disposal of any soil affected by the degraded crude oil that may be encountered or excavated during site activities. The SMP outlines detailed procedures for future property owners, developers, and/or maintenance firms to follow addressing such topics as dewatering from excavations, health and safety guidelines, and includes contact telephone numbers for Chevron and San Joaquin County Environmental Health Department. By 20 June 2008, please submit documentation that Mountain House Community Services District has been notified regarding the soil and groundwater conditions associated with Mountain House Site #1 and that the SMP was provided. In addition, include documentation that UPRR was provided a copy of the SMP and they were notified that land use within their right-of-way is limited to commercial/industrial purposes and if land use conditions change, the health risk evaluation may need to be revised. The Regional Water Boards are required to involve the public in site closure decisions under state law (including Health and Safety Code 25356.1). Regional Water Board staff is increasing its efforts to include additional public participation in its site closure programs. As part of this effort, Regional 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 Regional Water Board request that you conduct a site and offsite property owner survey (Survey).