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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. R5-2003-XXXX WASTE DISCHARGE REQUIREMENTS FOR ATLANTIC RICHFIELD COMPANY STOCKTON TERMINAL#40T ENHANCED BIOREMEDIATION PILOT STUDY SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region(hereafter Regional Board), finds that: 1. The Atlantic Richfield Company(hereafter Discharger) submitted a Report of Waste Discharge on 22 July 2003 and supplemental information on 1 August 2003 for a sulfate and nitrate injection pilot study for enhanced bioremediation. The Discharger owns the ARCO/BP bulk fuel terminal#40T at 2700 Washington Street in Stockton, Assessor's Parcel Number 145-030-09, 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. The Discharger's site currently has 31 on-site monitoring wells, three on-site wells installed for an In-Situ Stable Oxygen Generation(ISO-GEN)pilot study, and six off-site monitoring wells. 3. There are four identified groundwater bearing zones. A majority 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. Groundwater contains total petroleum hydrocarbons (TPH) as gasoline up to 240,000 micrograms per liter(µg/1), TPH as diesel up to 140,000 µg/1,benzene up to 27,000 µg/1, toluene up to 22,000 µg/1, ethylbenzene up to 3,500 µg/1,xylenes up to 15,000 µg/1, methyl tertiary butyl ether(MTBE)up to 290,000 µg11, and tertiary butyl alcohol up to 2,800 µg/l. 4. The Discharger proposes a pilot study to evaluate injection of nitrate and sulfate to bioremediate petroleum hydrocarbon pollution. The Discharger will do weekly slug injections of nitrate and sulfate substrates for three months with groundwater monitoring until concentrations of nitrate, sulfate, and any byproducts therefrom return to baseline levels. Each slug injection will be about 18 hours. If analytical data show that the microorganisms have used up the injected nitrate and sulfate before the end of one year, the Discharger may propose additional sulfate and nitrate injections for up to three months. The pilot study will be concluded when the amendments and byproducts do not exceed baseline levels.