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California Regional Water Quality Control Board ., <br /> �9 <br /> Central Valley Region <br /> Karl E. Longley,ScD,P.E.,Chair <br /> Linda S.Adams Arnold <br /> Secretaryfor 1685E Street,Fresno,California Schwarzenegger <br /> Environmental (559)445-51 16•Fax(559)445-59105910 Governor <br /> Protection http://www.waterboards,ca.gov/centralvalley <br /> 15 April 2009 uEvENED <br /> APR 1 6 2009 <br /> ENVIRONMENT HEALTH <br /> M. Scott Mansholt PEWNTISERMCES <br /> Chevron Environmental Management Company <br /> 6111 Bollinger Canyon Road <br /> Room 3432 <br /> San Ramon, CA 94583 <br /> REVIEW - SOIL AND GROUNDWATER INVESTIGATION REPORT CLARIFICATION, <br /> CATELLUS PROPERTY, TRACY, SAN JOAQUIN COUNTY <br /> Chevron Environmental Management Company (Chevron) submitted a Soil and Groundwater <br /> Investigation Report clarification letter, dated 27 January 2009 and prepared by Science <br /> Applications International Corporation (SAIC). <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff had <br /> requested that Chevron conduct additional groundwater investigation at the site. Central <br /> Valley Water Board staff had directed Chevron to assess whether the source of total <br /> petroleum hydrocarbon as diesel reported in one groundwater sample, was the result of a <br /> March 2008 diesel fuel spill or the result of a pipeline leak from the historical Old Valley <br /> Pipeline and/or Tidewater Associated Oil Company pipelines. <br /> Based on review of the Chevron response, project files and site investigative reports, Central <br /> Valley Water Board staff concur that additional groundwater characterization is not needed. <br /> If you have any questions or comments, please contact Dean Hubbard at (559) 445-5179. <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 EHD, Stockton <br /> Michael Jenkins, SAIC, Sacramento <br /> Dhalvinder Kaur Singh, Tracy <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br />