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California0egional Water Quality Co 1 Board _A <br /> Central Valley Region <br /> Kar!E. Longley,ScD,P.E.,Chair " <br /> Arnold <br /> Linda S.Adams 1685 F Street,Fresno,California 93706 <br /> 5chwarzenegger <br /> 5ecretaryfor <br /> (559)445-5116•Fax(559)445-5910 Governor <br /> Environmental http./iwww.waterboards.ca.gov/ccntralvalley <br /> Protection <br /> nMEVIEDD <br /> 30 September 2008 OCT 1 2008 <br /> MIRONMENT HEALTH <br /> PFRMIT/SERKES <br /> M. Scott Mansholt <br /> Chevron Environmental Management Company <br /> 6111 Bollinger Canyon Road <br /> Room 3432 <br /> San Ramon, CA 94583 <br /> REVIEW — HUMAN HEALTH SCREENING EVALUATION, MOUNTAIN HOUSE SITE <br /> DEVELOPMENT#3, MOUNTAIN HOUSE, SAN JOAQUIN COUNTY <br /> Chevron Environmental Management Company (Chevron) submitted a Human Health Risk <br /> Evaluation (HHSE) report, dated 28 August 2008 for the former Old Valley Pipeline Mountain <br /> House Development Site #3 project (Site). Science Applications International Corporation <br /> (SAIC) prepared the report for Chevron. <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br /> reviewed previous hydrogeologic investigations completed at the Site between 2001 and 2008. <br /> Central Valley Water Board staff concurred that soil and groundwater had been adequately <br /> delineated and a health risk evaluation could be conducted. <br /> The HHSE evaluated the risk of exposure to soil for future residents in accordance with a <br /> residential land use scenario. According to the SAIC's HHSE findings, the results...indicate <br /> that exposure to chemicals present in soil at the site should not result in unacceptable health <br /> risks for an adult or child onsite resident. SAIC's report summarized that no remedial action <br /> was needed and no further action was appropriate for the Site. <br /> SAIC on behalf of Chevron, will submit the HHSE to Department of Toxic Substances Control <br /> (DISC) Human Ecological Risk Division for review and comment. Following review of DTSC's <br /> comments, Central Valley Water Board staff will consider a no further action determination for <br /> the Site. <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />