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Water Quality Cord Board = . <br /> California Fj�conal <br /> y Central Valley Region <br /> Katherine Hart, Chair "or <br /> Edmund G. Brown Jr. <br /> Linda S. Adams 1685 E Street, Fresno,California 93706 Governor <br /> Acting Secretary for (559)445-5116 • Fax(559)445-5910 <br /> Environments!Protection httpalwww.waterboards.ca.govlcenkralvalley <br /> RECEIVED <br /> 25 January 2011 JAIL 26 29I1 <br /> ENVIRONMENr�! ,,-gLTH <br /> Lee Higgins <br /> Chevron Environmental Management Company <br /> 6001 Bollinger Canyon Road <br /> P. O. Box 6012 <br /> San Ramon, CA 94583 <br /> REVIEW - NO FURTHER ACTION REQUIRED REQUEST, MOUNTAIN HOUSE <br /> DEVELOPMENT SITE #3, MOUNTAIN HOUSE, SAN JOAQUIN COUNTY <br /> Chevron Environmental Management Company (Chevron) submitted a No Further Action <br /> Required Request (N FAR) Report, Mountain House Development Site #3, Mountain House, <br /> San Joaquin County (Site). The Report, dated 22 October 2010 was prepared for Chevron by <br /> Science Applications International Corporation — Benham Companies, LLC (SAiC). The <br /> project is along Byron Road approximately 800 feet northwest of Henderson Road, northwest <br /> of Tracy, in western San Joaquin County. The Site is within the Byron Road right-of-way <br /> (ROW) easement, primarily beneath the highway ROW and an adjacent alfalfa field. <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff has <br /> reviewed the Report and other Site investigation reports, prepared for Chevron by SAIC and <br /> other consulting firms. Detailed comments are provided in the enclosed memorandum and <br /> summarized below. <br /> Background <br /> Crude oil affected soil has been delineated at the Site. In August 2008, SAIC completed a <br /> Human Health Screening Evaluation (Screening Evaluation), using a conservative risk <br /> exposure scenario for a hypothetical future onsite resident. Exposure to chemicals present in <br /> soil should not result in an unacceptable risk for an adult or child onsite resident. <br /> In addition, an ecological screening evaluation indicates there are no threatened or <br /> endangered species at or within one mile of the Site. SAIC concluded that no remedial action <br /> is necessary to protect human or ecological health, and that an NFAR determination could be <br /> made and the Site is a candidate for closure. <br /> California Environmental Protection Agency <br /> �aRecycled Paper <br />