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California Reginal Water Quality Cc ':rol Board <br /> �. <br /> Central Valley Region _ <br /> Robert Schneider Chair M, <br /> Terry Tamminen Sacramento Main Office <br /> Secretary for Internet Address: http://www.swrcb.ca.gov/rwgcb5 �(1 Arnold Schwarzenegger <br /> Environmental 11020 Sun Center Drive#200 Rancho Cordova,CA 9! 'pf 51 o 8 2004 Governor <br /> Protection Phone(916)464-3291 Fax(916)464-4797 <br /> ENVIRONMENT HEALTH <br /> 3 September 2004 , <br /> p PERMIT/SERVICES <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 Report(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) 464-4719 or <br /> lewisd@rb5s.swrcb.ca.gov. <br /> DEVRA LEWIS <br /> Environmental Scientist <br /> cc: Mr. Harlen Knoll, San Joaquin County Public Health Services, Stockton <br /> Mr. Criseldo Mina, City of Tracy,Dept of Development and Engineering Services, Tracy <br /> Mr. Tom Brenkwitz, Tracy <br /> Mr. David Evans, SECOR International Incorporated, Sacramento <br /> California Environmental Protection Agency <br /> C3 Recycled Paper <br />