ARCHIVED REPORTS_2003 FEASABILITY STUDY REPORT AND SITE ASSESSMENT WORK PLAN

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S E C O R • 2003 Feasibility Study Report and Site Assessment Work Plan July 18, 2003 Page 1 1.0 INTRODUCTION SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management Company (Chevron), has prepared this Feasibility Study Report And Site Assessment Work Plan in response to the California Regional Water Quality Control Board, Central Valley Region (CRWQCB- CVR) — Cleanup and Abatement Order (CAO) No. R5-2002-0718, dated August 15, 2002 (Attachment A). The CAO directs the technical scope and schedule for this feasibility study. The feasibility study portion of this report was prepared in accordance with the CRWQCB-CVR feasibility study/remedial options evaluation report guidelines dated August 15, 2002. This document presents a discussion of the objectives of this feasibility study, site background, nature and extent of contamination, contaminate fate and transport, remedial objectives, description and evaluation of each remedial action alternative, potential impacts of each remedial action, estimated costs and project schedule for each remedial alternative, and preferred alternative. This document concludes with a work plan for additional site assessment activities. This work plan was prepared in accordance with the CRWQCB-CVR site assessment guidelines. 1.1 Objectives • The objective of this feasibility study is to select the most appropriate remedial technology for the site that protects off-site groundwater and achieves compliance with the WQOs (Water Quality Objectives) (per the Basin Plan and Resolution 92-49), and minimizes impacts to short and long term terminal operations. Several remedial options were proposed that achieved these objectives, and then evaluated based on the following criteria: • subsurface conditions in the vadose and saturated zones, • short-and long-term effects on hydrocarbon constituents, • ease of installation, and, • cost. The objective of the proposed site assessment activities is to further delineate the lateral extent of petroleum hydrocarbons in soil and groundwater as required by the CRWQCB-CVR in a letter dated April 3, 2003 (Attachment B). Data collected from this site assessment will be used to supplement SECOR's 2003 Site Assessment Report (SECOR, 2003b), in order to complete site characterization as required by CAO. 2.0 SITE BACKGROUND The site is located approximately five miles east of Tracy, in the agricultural community of Banta, California (Figure 1). The active fuel terminal has been in operation since 1966 and consists of nine above ground fuel storage tanks (AST), tank-truck loading racks (TTLR), above- and below-ground piping, and an office building. An adjacent unmanned cardlock fueling facility known as the Banta Cardlock Fueling Network (CFN), located at Kasson Road and 1-5, is operated by Woolsey Oil • Company and is not part of Chevron facility 100-1621 (SECOR, 2003c). I:\Chevron\1001621\REPORTS\2003\2003FS\FS_2003_revD.doc