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rCalifornia Regional Water Quality Control Board - ; <br /> Central Valley Region <br /> j - f <br /> Karl E. Longlev,SO), NE,Chair •-' <br /> Linda S.Adams Arnold <br /> ,r,revun jor Fresno Branch Office Schwarzenegger <br /> Fin tr mn+r,ucrl 1685 F Strcet,Fre,no.('ahlorma 93706 <br /> 1'nrrcllun <br /> (559)445-5116•Fax(559)-Ids- 910 <br /> http waterboards�a go►/cenlralvalley <br /> 8 July 2008 RECEIVED <br /> JUL 1 0 2008 <br /> crlemin Ery ronn>en�!Mdrage+"ettt cc <br /> M. Scott Mansholt <br /> Chevron Environmental Management Company <br /> 6111 Bollinger Canyon Road <br /> BR1 Y3432 <br /> San Ramon, CA 94583 <br /> REVIEW - SOIL AND GROUNDWATER INVESTIGATION REPORT, TRACY BYRON ROAD <br /> PROJECT, TRACY, SAN JOAQUIN COUNTY <br /> Regional Water Board staff has reviewed the referenced report, dated 21 May 2008, prepared <br /> 1 for Chevron Environmental Management Company (Chevron) by Science Applications <br /> International Corporation (SAIC). Additionally, we reviewed previous soil and groundwater <br /> investigation reports conducted by SAIC and others from 1996 to 2004 for predecessors of <br /> Chevron. Detailed comments are provided in the attached memorandum and summarized <br /> below <br /> ' SAIC's report summarized and concluded the following: <br /> • Soil and groundwater has been adequately delineated at the five boring locations and <br /> ' additional characterization was not needed. <br /> • Step-out borings SB-42, 43, and 45 (originally approved by our September 2004 <br /> ' response to the workplan) should be relocated. <br /> • Historical information for the Calderon Store property indicates that the boring proposed <br /> for this property was not needed. <br /> Regional Water Board staff concur that the borings and analytical results have delineated the <br /> ' upgradient extent of affected groundwater. We also concur with the recommendation to <br /> relocate the three proposed borings, and that the boring on the Calderon Store property is not <br /> needed. <br /> ' Cerlijinwia Environmentul Protection AI,ency <br />