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California Regional Water Quality Control Board <br /> ,^zn <br /> Central Valley Region = ` ° <br /> Katherine Hart, Chair <br /> Linda S. AdamsEdmund G. Brown Jr. <br /> Acting Secretary for 1685 E Street, Fresno, California 93706 Governor <br /> Environmental Protection (559)445-5116 • Fax(559)445-5910 <br /> http://www.waterboards.ca.gov/centraIvaIley <br /> 6 January 2011 RECEIVE® <br /> JAN 0 7 2011 <br /> ENVIRONMENTAL HEALTH <br /> Lee Higgins PERMIT/SERVICES <br /> Chevron Environmental Management Company <br /> 6111 Bollinger Canyon Road <br /> BR1 Y/3484 <br /> San Ramon, CA 94583 <br /> NO FURTHER ACTION REQUIRED DETERMINATION, BANTA ROAD-UPRR PROJECT, <br /> TRACY, SAN JOAQUIN COUNTY, CA <br /> Chevron Environmental Management Company (Chevron) submitted a request for No Further <br /> Action Required (NFAR) determination for the Banta Road-UPRR (Union Pacific Railroad), <br /> Tracy-Fresno Right-of-Way project site (Site). The NFAR, dated 9 March 2010, was prepared <br /> by Science Applications International Corporation — Benham Companies, LLC (SAIC) on <br /> behalf of Chevron. The historical Old Valley Pipeline (OVP) and Tidewater Associated Oil <br /> Company (TAOC) pipelines are within a utility corridor about 100-feet southwest of the Site. <br /> The Site is within the South Banta Road easement, about 2.5 miles southeast of Tracy. <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br /> reviewed the NFAR documentation and related file reports. In a September 2009 letter to <br /> Chevron, Central Valley Water Board staff concurred that soil and groundwater affected by <br /> crude oil leaks from Chevron's adjacent historical OVP and TAOC pipelines had been <br /> delineated and additional characterization was not needed. <br /> A Human Health Screening Evaluation was completed and submitted in September 2009. In a <br /> 5 August 2010 Central Valley Water Board letter to Chevron stated that based on the findings, <br /> the Site was a candidate for closure and a request for NFAR determination could be prepared. <br /> A conservative approach using a potential future onsite resident scenario was considered by <br /> SAIC, but the most likely future site use will be for potential construction/trench maintenance <br /> workers. The anticipated future Site use will likely remain unchanged for use as a utility <br /> corridor/highway easement needs. <br /> According to SAIC's investigation findings, residual concentrations of crude oil constituents will <br /> naturally degrade with time. Based on the characterization findings combined with SAIC's risk <br /> screening evaluation, documentation provides the appropriate technical data and rationale to <br /> support an NFAR determination for the Site. <br /> California Environmental Protection Agency <br /> cYecycled Paper <br />