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• <br /> EDMU <br /> ND G. BROWN JH. <br /> GOVERNOR <br /> 00- <br /> MATTHEW RODRIOUEZ <br /> C L I O R N I• ENVIROIJMENIOAL PRUTECTIUN <br /> Water Boards _ <br /> Central Valley Regional Water Quality Control Board RECEIVED ' <br /> MAR 14 Z01Z <br /> 13 March 2012 <br /> ENVIP NMENTAL RMITISERVICESLTH <br /> Michael N. Oliphant <br /> Chevron Environmental Management Company <br /> 6001 Bollinger Canyon Road <br /> P. O. Box 6012 <br /> San Ramon, CA 94583 <br /> REVIEW— ADDITIONAL INVESTIGATION WORKPLAN, 990 BEECHNUT AVENUE, TRACY, SAN <br /> JOAQUIN COUNTY <br /> Chevron Environmental Management Company (Chevron) submitted a Workplan for an Additional Soil <br /> and Groundwater Investigation (Workplan) dated 1 February 2012, for the 990 Beechnut Avenue <br /> project (Site). The Workplan was prepared on behalf of Chevron by AMEC Geomatrix, Inc. (AMEC). <br /> The Site is southwest of the intersection of Forest Hills Drive and Beechnut Avenue, in central Tracy. <br /> Details are provided in the enclosed memorandum. <br /> According to AMEC's 23 December 2010 Excavation Completion Report and Updated Screening Level <br /> Risk Assessment (SLRA) Report, the targeted PAH affected soil at the Site was removed. AMEC's <br /> updated SLRA revised a previously completed risk assessment provided in 2008. The 2010 SLRA <br /> concluded the Site was suitable for future commercial/industrial uses, with two exceptions at other <br /> areas of the Site where ethylbenzene and total petroleum hydrocarbon as crude oil (TPHc) remained in <br /> shallow soil. In order to eliminate and/or minimize the presence of ethylbenzene and TPHc <br /> concentrations in shallow soil and to provide unlimited/unrestricted potential future uses for a <br /> hypothetical onsite resident, Chevron has proposed additional characterization. <br /> Central Valley Regional Water Quality Control Board staff concurs with the Workplan. By <br /> 1 August 2012, please provide the findings for the soil investigation. <br /> If you have any questions or comments, please contact Dean Hubbard at (559) 445-5179 or by email at <br /> dhubbard(U-Materboards.ca.gov. <br /> SHELTON R. GRAY C. DEAN HUBBARD <br /> Senior Engineering Geologist Engineering Geologist <br /> P.G. No. 6357 <br /> CC'. Michael J. Infurna, San Joaquin County DEH, Stockton <br /> Gary Foote, AMEC, Oakland <br /> KARL E. LONGLEY ScD, P.E., CHAIR I PAMELA C. CREEDON, EXECUTIVE OFFICER <br /> 1685 E Street,Fresno,CA 93706 1 WW1^.waterboards.ca.gov/centralvalley <br /> C*, RECYCLED PAPER <br />