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r <br /> California R*oval Water Quality Ontrol Board %p <br /> Central Valley Region 9p: <br /> •Zw..waf <br /> Peter M.Rooney Sacramento Main Office Ed J.Schnabel <br /> Secretaryfor Internet Address: htip://www.swrcb.u.gov/—r gcb5/home.html _ - <br /> Environmental 3443 Routier Road,Suite A,Sacramento,California 95827-3003 ' �, Chair <br /> Protection Phone(916)255-3000•FAX(916)255-3015 <br /> 8 October 1998 <br /> Ms. Katie Hower <br /> Chevron Pipe Line Company <br /> 4000 Executive Parkway, Suite 400 <br /> San Ramon, CA 94583 <br /> SITE STATUS, FORMER LYOTH LOADING STATION, CHEVRON PIPE LINE COMPANY, <br /> TRACY, SAN JOAQUIN COUNTY <br /> I have reviewed various investigation and monitoring reports for Chevron Pipe Line Company's (CPL) <br /> former Lyoth Loading Station in Tracy to determine the status of the site. I also have reviewed CPL'S <br /> Technical Approach to Site Evaluation and Decision Making, Old Valley Pipeline Sites, Central Valley <br /> Region. Detailed comments on the various documents and on the technical approach are presented in the <br /> attached memorandum and summarized below. <br /> 1. The vertical extent of soil contamination is undefined at the following locations: B-9,B-16,B-21, GP-3, <br /> and MW-2. Due to the inconsistency in sampling, other locations may also lack definition. The lateral <br /> extent of crude oil soil contamination at GP-3 is defined, but the extent of TPHd and PAI-Is is not defined. <br /> The lateral extent of crude oil, TPHd, and PAH soil contamination at GP-9 and GP-10 needs definition. <br /> 2. The vertical extent of groundwater contamination at MW-2, MW-6, and potentially at MW-7, GP-3, <br /> and GP-10 needs to be defined. <br /> 3. The threat to water quality is not being adequately addressed because the test methods for PAI-Is are not <br /> sufficiently sensitive to allow their detection below the water quality objectives. To address this <br /> concern, Chevron should analyze both water and filtered material (such as that retained during silica gel <br /> cleanup)to determine the total PAI-Is and their speciation. <br /> 4. The technical approach should be revised and made consistent with State Water Board Resolution <br /> Nos. 88-63 and 92-49 and Appendix B of the Tri-Regional Recommendations. <br /> 5. Chevron should obtain Board approval prior to cessation of the monitoring program. <br /> By 4 November 1998,please address the above comments and submit a work plan to define the lateral and <br /> vertical extent of soil and groundwater contamination as specified in the memorandum. If you have any <br /> questions,you may call me at(916) 255-3081. <br /> � .. <br /> PHIL ISORENA <br /> Associate Engineer <br /> cc: San Joaquin County Public Health Services, Stockton <br /> Mr. Jim Simpson, Stanislaus County Department of Environmental Resources, Modesto <br /> Ms. Da Zemo, Geomatrix Consultants, San Francisco <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br /> psillsb/u:lyoth.lir <br />