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California ISional Water Quality Co*l Board <br /> Central Valley Region , ` <br /> Katherine Hart, Chair ° <br /> Linda S.Adams 1685 E Street, Fresno, California 93706 Arnold <br /> Secretary for (559)445-5116 • Fax(559)445-5910 Schwarzenegger <br /> Environmental http:]/www,waterboarll.ra.gov/centraivaliey Governor <br /> Protection 10) <br /> 9 July 2010 <br /> JJ' <br /> J 12 1010 <br /> ENORONMENT HEALTfi <br /> Lee Higgins PERMIT/SERVICES <br /> Chevron Environmental Management Company <br /> 6111 Ballinger Canyon Road <br /> BR1 Y13484 <br /> San Ramon, CA 94583 <br /> REVIEW— HUMAN HEALTH SCREENING EVALUATION, MOUNTAIN HOUSE <br /> DEVELOPMENT SITE #3, MOUNTAIN HOUSE, SAN JOAQUIN COUNTY <br /> On behalf of Chevron Environmental Management Company (Chevron), Science Applications <br /> International Corporation (SAIC) submitted the 28 August 2008 report Human Health <br /> Screening Evaluation (Screening Evaluation), Mountain House Development Site #3 (Site). <br /> The Site is along Byron Road approximately 800 feet northwest of Henderson Road, <br /> northwest of Tracy, in western San Joaquin County. The Mountain House Development Site <br /> #1 project is approximately one-quarter mile to the northwest. <br /> The Site lies within the Byron Road right-of-way (ROW) easement, primarily beneath the <br /> Byron Road highway alignment and within an adjacent alfalfa field. The ROW easement is <br /> approximately 125 feet wide and includes the historical Old Valley Pipeline (OVP) that lies <br /> adjacent the southwest side of Byron Road. The Union Pacific Railroad (UPRR) ROW, <br /> approximately 140 feet wide, is adjacent to the northeast side of the highway and includes the <br /> historical Tidewater Associated Oil Company (TAOC) pipelines as well as the UPRR tracks. <br /> An active refined petroleum product pipeline, the Bay Area Products Line operated by <br /> Chevron Pipeline Company, is within the UPRR easement between the tracks and the <br /> highway. <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff has <br /> reviewed the Screening Evaluation report. Additionally, 2001 to 2008 soil and groundwater <br /> project investigation reports in our files, prepared for Chevron by SAIC and other <br /> environmental consulting firms, were reviewed. <br /> According to SAIC's Screening Evaluation documentation: <br /> • Current land use is for agricultural, highway and active pipeline easements, and the <br /> UPRR right-of-way; the future land use will not likely change. A residential scenario <br /> was evaluated as the most conservative estimate of risk associated with exposure to <br /> residual crude oil at the Site. This approach is consistent with the residential land use <br /> scenario described in the California Department of Toxic Substances Control (DISC) <br /> Preliminary Endangerment Assessment (PEA) Guidance Manual. In accordance with <br /> California Environmental Protection Agency <br /> OD <br /> �.APecycled Paper <br />