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• <br /> 41% California F fional Water Quality Co*l 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/centralvalle Governor <br /> Environmental Protection RECEIVED <br /> 3 March 2011 MAR 0 4 2011 <br /> Lee Higgins • ENVIRONMENTAL HEALTH <br /> Chevron Environmental Management Compan�ERMIT/SERVICES <br /> 6001 Bollinger Canyon Road <br /> P. O. Box 6012 <br /> San Ramon, CA 94583 <br /> REVIEW —WORKPLAN ADDENDUM - TAOC 6th STREET TRACY RAIL YARD PROPERTY, <br /> TRACY, SAN JOAQUIN COUNTY <br /> Chevron Environmental Management Company (Chevron) submitted a Workplan Addendum <br /> (Workplan) dated 15 February 2011 for the Tidewater Associated Oil Company (TAOC) 6th <br /> Street Tracy Rail Yard project (Site), in central Tracy. The Workplan was submitted by AMEC <br /> Geomatrix, Inc. (AMEC) on behalf of Chevron. The Workplan was provided in response to <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff review <br /> comments to an earlier Soil and Groundwater Investigation Report dated 30 July 2010. <br /> A Central Valley Water Board staff letter to Chevron, dated 7 December 2010, requested <br /> additional soil and groundwater sampling information and fuel fingerprint evaluation, <br /> particularly from the areas near AMEC soil borings TRY-1 and TRY-29. <br /> Based on information contained in earlier reports, AMEC provided the following: <br /> Vicinity of TRY-1 (within Operable Unit 2 [OU-21) <br /> • Adequate fuel fingerprint analysis and evaluation information from earlier investigations <br /> and AMEC's July 2010 report has been completed. Additional fuel fingerprinting is not <br /> needed for soil samples collected from borings in this area. <br /> • Previous and recent investigative findings determined that sufficient analytical results <br /> for samples from offset locations has adequately defined the lateral and vertical extent <br /> of crude oil impacts and additional work is not needed. <br /> • The lateral and vertical extent of affected groundwater has not been defined and <br /> additional information is needed. <br /> Vicinity of TRY-29 (within Operable Unit 5 [OU-51) <br /> • Adequate fuel fingerprint evaluation from earlier investigations and AMEC's July 2010 <br /> report has been completed. Additional fuel fingerprinting analysis is not needed in this <br /> area. <br /> California Environmental Protection Agency <br /> ca Recycled Paper <br />