SITE INFORMATION AND CORRESPONDENCE

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Lee Higgins -4 - 9 July 2010 Chevron ' Mountain House Site##3 the Site. SAIC concluded that in-place management/monitored natural attenuation was the most feasible and cost effective process for the Site given the hydrocarbons present in soil and groundwater are immobile and have been defined generally beneath the highway, active pipeline corridor, railroad tracks, and an adjacent agricultural field. Based on the review, Central Valley Water Board staff has the following comments: • A conservative approach utilizing a residential scenario for a hypothetical future resident was considered in the Screening Evaluation. However, the Site use is not likely to change and is anticipated for continued use as part of the highway, railroad, active pipelines, and for agricultural purposes. Central Valley Water Board staff concur with the findings of the Screening Evaluation and related supporting documentation. The Site is a candidate for closure under the conditions evaluated. A request for a No Further Action Required (NFAR) determination may be prepared. • Documentation to support a NFAR closure determination should be completed in accordance with the California Regional Water Quality Control Board Central Valley Region's 16 April 2004 update to Appendix A of the Tri-Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites - No Further Action Requests, Section 6.5 - NFAR for Cases Exceeding Wafer Quality Objectives should be followed for documenting Site conditions. • Consistent with other Chevron OVP sites, a Soil and Groundwater Management Plan (SGMP) needs to be prepared and submitted. The SGMP designates Chevron as the responsible party and serves as a guideline for Chevron to implement for the handling, reuse, and disposal of any degraded crude oil affected soil that may be encountered or excavated during future Site activities. By 20 December 2010, please submit the request for NFAR determination report. If you have any uestions r comments, please call Dean Hubbard at (559) 445-5179. kik S L ON R. GRAY C. DEAN HUBBARD S nior Engineering Geologist Engineering Geologist P.G. No. 6357 cc: "-Michael InfUrnafroan Joaquin County EHD, Stockton W. Lee Hammond, UPRR, Omaha, NE Kevin Peters, Shea Mountain House LLC, Livermore Nader Shareghi, Mountain House Community Services District, Mountain House Patricia Pombo, Santa Rosa Cunha FLP, Oakley, CA Roy Cunha, Pleasant Hill Michael Jenkins, SAIC, Sacramento Michael Hurd, SAIC, Oakland