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' Eu,"..C, buown Jr <br /> ZR, ���® <br /> fff�ss� <br /> Water Boards <br /> Central Valley Regional Water Quality Control Board <br /> EN%PERMIENTAL HEAL <br /> T SERVICES TM <br /> Michael N. Oliphant 26 March 2012 <br /> Chevron Environmental Management Company <br /> 6001 Bollinger Canyon Road <br /> P. O. Box 6012 <br /> San Ramon, CA 94583 <br /> REVIEW - SOIL AND GROUNDWATER INVESTIGATION REPORT, TRACY RAIL YARD <br /> OFFSITE - WEST AREA, TRACY, SAN JOAQUIN COUNTY <br /> Chevron Environmental Management Company (Chevron) submitted the Soil and Groundwater <br /> Investigation Report dated 30 August 2011 for the Tidewater Associated Oil Company (TAOC; a <br /> Chevron predecessor company) Tracy Rail Yard Offsite -West Area project (Site), in central <br /> Tracy. The report was prepared on behalf of Chevron by AMEC Geomatrix, Inc. (AMEC). The <br /> former TAOC crude oil pipelines ran through the approximate center of the Site. Central Valley <br /> Regional Water Quality Control Board (Central Valley Water Board) staff has reviewed the <br /> report and detailed comments provided in the enclosed memorandum are summarized below. <br /> AMEC's report concluded that the extent of crude oil affected soil and groundwater has been <br /> defined, no further characterization is needed, and a human health risk assessment is <br /> recommended. Based on our review, Central Valley Water Board staff has the following <br /> comments: <br /> • Staff concur that crude oil affected soil and groundwater has been adequately <br /> delineated, and a human health risk assessment is recommended as the next step prior <br /> to a No Further Action Required determination. <br /> • Applicable environmental screening levels, protective of groundwater and human health, <br /> need to be considered. A final determination cannot be made until a human health risk <br /> assessment including an ecological receptor evaluation is submitted for consideration. <br /> By 10 July 2012, please submit the human health risk assessment. If you have any questions <br /> please contact Dean Hubbard at (559) 445-5179 or by email at dhubbard(aD-waterboards.ca.gov. <br /> S'HELTON R. GRAY C. DEAN HUBBARD <br /> Senior Engineering Geologist Engineering Geologist <br /> P.G. No. 6357 <br /> Enclosure: Memorandum <br /> cc: \,/Michael Infurna, San Joaquin County EHD, Stockton <br /> Gary Foote, AMEC, Oakland <br /> KAR; E LONC-C' SCD, P.E. C.AIF. PAME14 C. GREEU011. EXECU11V1 CIFFICEr' <br /> Si-e! Fre—c CA 93700 v+wvr_%aterooarm,ca.gowcentralvahe. <br /> LJ -- ..ori. ,— <br />