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CALIFORNIA REGIONAL WATERQ UALITY CONTROL BOARD • CENTRAL VALLEY REGION CLEANUP AND ABATEMENT ORDER NO. R5-2002-0718 ' FOR CHEVRON PRODUCTS COMPANY BANTA BULK FUEL TERMINAL BANTA, SAN JOAQUIN COUNTY This Order is issued to Chevron Products Company based on provisions of California Water Code Section 13304, which authorizes the California Regional Water Quality Control Board, Central Valley Region(hereafter Regional Board) to issue a Cleanup and Abatement Order. ' The Regional Board finds,with respect to the Discharger's acts or failure to act, the following: BACKGROUND 1. Chevron Products Company(hereafter Discharger) owns and operates a bulk fuel terminal at 22888 South Kasson Road in Banta(site), northeast of Kasson Road, surrounded on the north and west by agricultural fields and by a cardlock fueling facility to the southeast, as shown in Attachment 1, which is made part of this Order. 2. The active fuel terminal has nine aboveground storage tanks that range in size and contents, tank- truck loading racks, above and below ground piping, an office building, and other structures used for storage. The Discharger has operated since 1966. Facility operations, including recorded spills in June 1984, August 1990,August 1998, and November 1999, have resulted in releases from the terminal that have polluted soil and groundwater with petroleum hydrocarbons and associated fuel constituents, including total petroleum hydrocarbons as diesel and gasoline, benzene,toluene, ethylbenzene, xylenes,methyl tertiary butyl ether, and tertiary amyl methyl ether. 3. Chevron began groundwater monitoring activities in 1984 and has conducted quarterly and semi- annual monitoring since then. Currently, there are 36 monitoring wells, one water supply well, and 15 wells used for remedial activities. Separate phase hydrocarbons have-been and continue to be observed at the site. 4. On 28 October 1994, the Executive Officer issued Cleanup and Abatement Order(Order)No. 94-715 to require delineation of petroleum pollution in soil and in the deeper water bearing zone, and submit a feasibility study to remediate petroleum-polluted soil and groundwater. 5. Since Order No. 94-715 was issued, the Discharger has utilized pump and treat and dual phase extraction to remediate polluted groundwater and has utilized bioventing, soil vapor extraction, and excavation to address soil pollution at the site. However, the extent of pollution in soils and groundwater has not been fully characterized. 6. Since October 2001, the Discharger has conducted a pilot study on the use of In-Situ Stable Oxygen • Generation System(ISO-GEN) for groundwater and separate phase hydrocarbon remediation. On 25 March 2002, Board staff approved a work plan for off-site assessment to delineate the lateral extent of petroleum pollution.