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SECOND DRAFT <br /> 24 January 1997 <br /> Project 3761.01 <br /> Ms. Katie Hower <br /> Chevron Pipe Line Company <br /> P.O. Box 5059 <br /> San Ramon, California 94583-0959 <br /> Subject: Technical Approach to Site Evaluation and Decision-Making <br /> Old Valley Pipeline Sites - Central Valley Region <br /> Dear Ms. Hower: <br /> This document has been developed by Geomatrix Consultants, Inc. (Geomatrix), on behalf of <br /> Chevron Pipe Line Company (CPL) to provide a consistent approach for site evaluation and <br /> decision-making regarding petroleum releases attributed to the historical Wait-Mendota- <br /> Richmond(Old Valley) Pipeline within the Central Valley-Regional Water Quality Control <br /> Board's (RWQCB)jurisdiction(Figure 1). The purpose of this approach is to protect <br /> groundwater and human health, allow for property development of affected parcels, and make <br /> site management and site closure decisions per draft RWQCB "Low Risk Criteria" (RWQCB, <br /> 1996a) or applicable updates. The value of conforming to a consistent approach for evaluating <br /> these sites was agreed to in a meeting among representatives of RWQCB, CPL, and Geomatrix <br /> on 10 October 1996. This approach makes use of technical lessons learned on several past Old <br /> Valley Pipeline sites, most notably the Dividend Property in Tracy. <br /> BACKGROUND <br /> The Old Valley Pipeline carred San Joaquin Valley crude oil north from the Kern River Oil <br /> Fields to Standard Oil Company's Richmond Refinery starting in approximately 1902. <br /> Sections of the pipeline south of Tracy were removed from service in the 1930s. Portions of <br /> the pipeline north of Tracy were used to transport Bunker C locomotive fuel oil from the <br /> refinery to railroad distribution areas from the 1920s to the 1950s. Due to the high viscosity of <br />