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DEC-28-2004 14 . 14 RWOCE-0V 916 255 3052 P . 02i02 <br /> California Regional Water Quality Control Board y <br /> Central Valley Region <br /> 4a Robert Schneider Chair <br /> Terry Tamminen Sacramento Mala OPficc <br /> Secretary for Inlamc1 Address: http;/lwvwswtcb,os.govhwgcb5 Arnold Schwerceneggtr <br /> Environmental 11020 Sun Cmter Drive #200 Ronehc Cmdev4, CA 95670-6114 Governor <br /> Protection Phonc (916) 464.3291 Fax (916) 464-4791 <br /> 3 September 2004 ` <br /> Mr. Robert Cochran <br /> Chevron Environmental Management Company <br /> 6001 Bollinger Canyon Road <br /> San Ramon, CA 94583-0804 <br /> REVIEW OF INVESTIGATION REPORT AND WORK PLAN, CHEVRON PIPELINE, <br /> WEST GRANT LINE ROAD, TRACY, SAN JOAQUIN COUNTY <br /> Staff of the Central Valley Regional Water Quality Control Board (Regional Board) reviewed the <br /> 12 August 2004 2004 Chevron Pipeline Assessment Reporr (Report) and the 31 August 2004 2004 <br /> Chevron Pipeline Characterization Work Plan (Work Plan) submitted by SECOR International <br /> Incorporated on behalf of Chevron Environmental Management Company (Chevron) for the active <br /> Chevron pipeline that runs along West Grant Line Road in Tracy. The Report discusses the soil <br /> and grab groundwater sampling results from three borings about 50 feet north of the estimated <br /> location of the pipeline. <br /> Evaluation of the sample chromatograms by the laboratories state the detections identified as jet <br /> fuel are more characteristic of weathered or degraded gasoline, Based on the review of the Report, <br /> Regional Board staff had a conference call with you and David Evans of SECOR on 19 August to <br /> discuss the results , Based on that conversation, Chevron submitted the Work Plan which proposes <br /> to do additional research to verify the location of the pipeline, provide information on the product <br /> currently and historically transported by the pipeline, do a utility search along West Grant Line <br /> Road, and prepare a groundwater flow direction history for the area based on nearby sites, <br /> Regional Board staff concurs with the Work Plan, By 29 October 2004, please submit the <br /> additional information requested in the 19 August phone conversation and proposed in the Work <br /> Plan. If you have any questions, you may contact me at (916) 4644719 or <br /> lewisd@rbSs.sWrc-b.cca.gay. <br /> v( <br /> DEVRA, LEWIS <br /> Environmental Scientist <br /> cc; Mr. Harlen Knoll, San Joaquin County Public Health Services, Stockton <br /> Mr. Ctiseldo Mina, City of Tracy, Dept of Development and Engineering Services, Tracy <br /> Mr, Tom Breakwitz, Tracy <br /> Mr. David Evans, SECOR International Incorporated, Sacramento <br /> California Environmental Protection Agency <br /> TOTRL P , 02 <br /> coo ( ] O,LN9iVH2IDPS � �-f HODRS BOTST ! ZOSS Ttl,i FC : CT :411,T 50 : h0 / TO <br />