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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2003-0165 3 SUPPORT TERMINALS OPERATING PARTNERSHIP,LP STOCKTON TERMINAL ENHANCED BIOREMEDIATION PILOT STUDY SAN JOAQUIN COUNTY to 10 gallons per minute. The injection will be distributed across the three injection wells using a timing system. 10. The Discharger will monitor extraction wells EX-1 and EX-2, injection wells IN-1, IN-2, and IN-3, and monitoring wells PS-1, PS-2, PS-3, PS-4, PS-5, and PS-6 prior to the startup, two weeks after startup, and then monthly until the conclusion of the pilot study as outlined in the attached MRP No. R5-2003-0165. In addition, the Discharger will sample downgradient monitoring wells PS/P-11, PS/P-12, and PS/P-13 for baseline concentrations of nitrogen, phosphorus, and potassium (collectively "nutrients") prior to startup, as outlined in the attached MRP No. R5-2003-0165. These wells are shown on Attachment C, which is attached hereto and made part of this Order by reference. 11. If the concentrations of nutrients exceed baseline concentrations by more than 20 percent in either extraction well EX-1 or EX-2, a confirmation sample will be collected within 7 days of receiving the results and the Discharger will notify Regional Board staff. The standard acceptable laboratory variation for these parameters is 20 percent. If the exceedance of nutrients is confirmed, the Discharger will stop injecting the nutrients and will sample wells PS/P-11, PS/P-12, and PS/P-13, which are located between 70 and 200 feet downgradient of the pilot study extraction wells and analyze for the nutrients. Groundwater is estimated to move between 5 and 69 feet per year. Therefore, the soonest the nutrients would be expected to reach these downgradient wells would be in a year following the arrival of these compounds at the location of the extraction wells. The Discharger will sample the downgradient wells at three and six months after the sixth month sampling event in the extraction wells (i.e., one year following the completion of the pilot study). If nutrients and/or intermediate breakdown products including, but not limited to, tertiary butyl alcohol or acetone, are detected in the downgradient wells above baseline concentrations, the Discharger will install extraction wells near the downgradient wells and begin extracting. 12. The injection of chemicals into waters of the State is subject to regulation under the California Water Code. This Order authorizes the Discharger to inject PetroZyme and NutriMax into groundwater subject to specific discharge requirements. 13. The Water Quality Control Plan for the Sacramento River and San Joaquin River Basins, Fourth Edition, (hereafter Basin Plan) designates beneficial uses, establishes water quality objectives, contains implementation plans and policies for protecting waters of the basin, and incorporates by reference plans and policies adopted by the State Water Resources Control Board (State Board). Pursuant to Section 13263(a) of the California Water Code, waste discharge requirements must implement the Basin Plan. 14. Surface water drainage is to the San Joaquin River within the legal boundaries of the Sacramento—San Joaquin Delta. The beneficial uses of the Sacramento—San Joaquin Delta are municipal and domestic supply; agricultural supply; process and service industrial