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S E C O R Cleanup Plan • October 27, 2003 Page 1 ' 1.0 INTRODUCTION SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management Company (Chevron), has prepared this Cleanup 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 Cleanup Plan. This Cleanup Plan was prepared in accordance with the CRWQCB-CVR guidance, dated August 21, 2003 (Attachment B). This document presents a discussion of the objectives of this Cleanup Plan, site background, nature and extent of contamination, a conceptual design of the selected remedial alternative, and a project schedule for implementation of the selected alternative. I ' 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 1001621. The tank farm area, which includes nine ASTs are enclosed by a 3-foot high secondary containment berm. A portion of this berm forms a spill containment area, which is located in the northern portion of the terminal. Fuel lines from the fuel storage tanks run above ground within the secondary containment area as well as below-ground within the tank-truck loading rack area (Figure 2). Retention ponds located on the north side of the terminal are used to store storm water as needed. Five spills have been documented at the site. The first spill occurred on June 9, 1984 around the ' transmix tank and consisted of 13,000 gallons of gasoline, diesel and heating oil. Soil was excavated immediately in the spill area until no subjective evidence of hydrocarbons remained. The second spill occurred in August of 1990 and consisted of a tank overflow of approximately 300 ' gallons of gasoline. The third spill occurred in August of 1998 when an unknown volume of gasoline was released as a result tank T-137 being overfilled. The fourth spill occurred in November of 1999 when an unknown quantity of red dye diesel was released from a tanker overfill at the loading racks. The last spill occurred on December 28, 2001 when a flange on a piping manifold, near MW-15A, ' failed and released less than 10 gallons of red dye diesel at the site (SECOR, 2002a). 2.1 Geology The site is in the Central Valley, which is a structural depression (approximately 400 miles long and 20 to 70 miles wide) extending from Redding to the Tehachapi Mountains. Water-producing deposits ' in the valley are primarily unconsolidated continental deposits (alluvium) of Pliocene age that extend to depths of up to 3,500 ft(USGS, 1998). • ' I:\Chevron\1001621\REPORTS\2003\2003-Cleanup Plan\Cleanup Plan.doc