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Chevron <br /> E;�ti,�Up s'rhTaL TlChevron <br /> ,r_-niill <br /> 95 SEP 20 AMIE 18 <br /> Chevron Pipe Line Company <br /> September 16, 1995 4000 Executive Parkway,Suite 400 <br /> San Ramon,CA 94583 <br /> P.O.Box 5059 <br /> San Ramon,CA 94583-0959 <br /> Mr. Joel M. Weiss <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> Results of Additional Soil and Groundwater Characterization and <br /> Refined Risk Evaluation Work Plan <br /> Alden Park-Tracy, California <br /> Dear Mr. Weiss: <br /> In response to your August 1, 1996 letter(attached), Chevron Pipe Line Company (CPL) <br /> requests your concurrence on the submittal dates for the following deliverables: <br /> The Results of Additional Soil and Groundwater Characterization, prepared on behalf of CPL by <br /> Geomatrix Consultants Inc. (Geomatrix), will be submitted to your office on September 25, 1996. <br /> The report will describe the results of the December 1995 soil sampling and groundwater <br /> monitoring conducted in April and May 1996. This report will discuss any potential threat the <br /> residual hydrocarbons may pose to groundwater beneath the site, and will present <br /> recommendations and a schedule for future site activities. <br /> The Geomatrix Refined Risk Evaluation Work Plan will be submitted by September 30, 1996. <br /> Methods to evaluate the potential human health risks that may be associated with the residual <br /> petroleum hydrocarbons will be proposed. These methods have been previously reviewed with <br /> the Department Toxic Substance Control (DTSC). <br /> CPL is planning to implement a pilot separate phase removal program from five groundwater <br /> monitoring wells in Alden Park during the week of September 16, 1996. This program will <br /> evaluate the feasibility of removing the high viscosity oil from wells. A description and the results <br /> of the pilot program will be provided to the RWQCB in November 1996. <br /> CPL will submit the subject documents as described, in lieu of the RWQCB's previously <br /> requested date of September 15, 1996. <br /> :... <br />