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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. R5-2003-0165 WASTE DISCHARGE REQUIREMENTS FOR SUPPORT TERMINALS OPERATING PARTNERSHIP, LP STOCKTON TERMINAL ENHANCED BIOREMEDIATION PILOT STUDY SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region (hereafter Regional Board), finds that: 1. The Support Terminals Operating Partnership,LP (hereafter Discharger) submitted a Report of Waste Discharge on 9 July 2003 and supplemental information on 29 July 2003 for an enhanced bioremediation pilot study. The Discharger owns the bulk fuel terminal at 2941 Navy Drive in Stockton, Assessor's Parcel Number 145-030-09 (hereafter referred to as Site), at township 1N, range 6E, section 8, Mount Diablo Base and Meridian. The general location of the facility is shown on Attachment A, which is attached hereto and made part of this Order by reference. 2. The Discharger, along with three other bulk fuel terminal companies on the same parcel, formed the Stockton Terminals Technical Committee (STTC) to address groundwater pollution across the entire parcel. Site groundwater monitoring is performed by the STTC as required by Monitoring and Reporting Program (MRP) No. 5-01-819. Currently, the Discharger's terminal has one on-site monitoring well and seven STTC off-site monitoring wells. Groundwater contains total petroleum hydrocarbons (TPH) as gasoline up to 150,000 micrograms per liter(µg/1), TPH as diesel up to 9,400 µg/1, benzene up to 45,000 µg/1, toluene up to 55,000 µg/1, ethylbenzene up to 23,000 µg/1, xylenes up to 130,000 µg/1, and methyl tertiary butyl ether up to 280,000 µg/1. 3. In April 2002, the Discharger reported two separate releases of gasoline from aboveground storage tanks (AST) 3301 and 3302. In June 2002, about 1,000 gallons of diesel were released from AST 1503. Investigations in August 2002 and March 2003 delineated the extent of petroleum pollution from these releases. 4. There are four identified groundwater bearing zones. Most of the mass of petroleum hydrocarbon pollution is in the A water bearing zone, which is from about 5 to 20 feet below ground surface. 5. The Discharger proposes to install two extraction wells, three injection wells, and six monitoring wells. The Discharger also proposes to install and operate an enzyme-catalyzed dissolved oxygen in situ treatment system for six months as a pilot study. Groundwater monitoring of amendments, breakdown products, and byproducts will continue until concentrations return to baseline levels, which will conclude the pilot study.