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Californiaffgional Water Quality Cont#Board a , <br /> Central Valley Region 1 <br /> Linda S.Adams <br /> Karl E. Longley,SCD,PE,Chair # <br /> .r. <br /> Secretagfor Fresno Branch Office Arnold <br /> Environmental 1685 L Street,Fresno,California 93706 Schwarzenegger <br /> Protection (559)445-5116.Fax(559)445-5910 Governor <br /> htip://wNvw,waterboards.ca.gov/ccl)trllvalley <br /> 8 July 2008 RECEIVED <br /> JUL 10 2008 <br /> Chevron Environment#Management Go, <br /> M. Scott Mansholt w"I L E <br /> Chevron Environmental Management Company <br /> 6111 Bollinger Canyon Road <br /> BR 1 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 /> 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 SAIL 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 /> California Environmental Protection Agency <br /> Vl�h'ecycIt,d Paper <br />