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California " igional Water Quality Cc `rol Board <br /> Central Valley Region <br /> Katherine Hart, Chair <br /> 1685 E Street, Fresno, California 93706 <br /> Linda S.Adams (559)445-5116 • FAX(559)445-5910 Edmund G.Brown Jr. <br /> Acting Secretary for http://www.waterboards.ca.gov/centralvalley Governor <br /> Environmental Protection <br /> 21 July 2011 �! <br /> JUt� 2 5 2011 <br /> ENVIRONMENTAv1C St.TH <br /> Michael N. Oliphant pERM►TISER <br /> Chevron Environmental Management Company <br /> P. O. Box 6012 <br /> San Ramon, CA 94583 <br /> REVIEW - SOIL REMEDIAL ACTION PLAN, FORMER TRACY PUMP STATION, WEST <br /> GRANT LINE ROAD, TRACY, SAN JOAQUIN COUNTY <br /> Chevron Environmental Management Company (Chevron) submitted the referenced Remedial <br /> Action Plan (RAP) dated 22 June 2011 for the Former Tracy Pump Station property (Site). <br /> The Site is located at 14821 West Grant Line Road northwest of the intersection of Byron <br /> Road and West Grant Line Road, in a rural area northwest of Tracy, central-western San <br /> Joaquin County. The soil remediation plan was prepared by Science Applications <br /> International Corporation — Benham Companies, LLC (SAIC). <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br /> reviewed the referenced report in conjunction with related Site investigation reports in our <br /> project files. Site characterizations have been conducted since approximately 2002. The <br /> extent of crude oil affected soil and groundwater was defined and described in a previous <br /> investigation report. A previous soil investigation included a boring drilled within/near a former <br /> pond containment area to obtain samples for analysis. According to the laboratory results, <br /> elevated concentrations of polynuclear aromatic hydrocarbon (PAH) compounds were <br /> detected at concentrations that exceed environmental screening levels. <br /> Chevron subsequently determined that additional investigation was warranted to define the <br /> extent of PAHs near the former boring. It was also decided to conduct limited excavation <br /> near the boring to remove the shallow soil containing the elevated PAHs. Removal of the <br /> affected soil would result in more conservative land use conditions and be more protective of <br /> human health at the Site. <br /> The excavation confirmation sample results will be used as part of a future health risk <br /> screening evaluation for the Site. A soil delineation and profiling workplan was approved by <br /> Central Valley Water Board staff in February 2011. To minimize disturbance of the Site <br /> businesses and to determine the approximate dimensions for excavation, SAIC completed <br /> pre-excavation borings to obtain soil samples for PAH analysis. <br /> California Environmental Protection Agency <br /> faRecycled Paper <br />