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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2008-0064 4 BP WEST COAST PRODUCTS ARCO/BP STOCKTON TERMINAL#40T ENHANCED BIOREMEDIATION PILOT STUDY SAN JOAQUIN COUNTY monthly during the first six months, and quarterly thereafter during the pilot test for the parameters outlined in the attached MRP No. R5-2008-0064. 14.If the levels of nitrate and sulfate in AR/MW-23A drop below baseline levels and upon written approval of the Executive Officer, the Discharger may begin another three-month cycle of the injection with up to 280 mg/L of the potassium nitrate/sulfate/phosphate solution. 15.In the event that concentrations of nitrate, sulfate, nitrogen, sodium, ammonium, sulfide, phosphate, and/or phosphorous in downgradient well AR/MW-1A exceed the baseline concentrations listed in Item C.1 below by 20 percent or more, or if the injected material is observed leaving the well network above baseline concentrations, injections will cease and the Discharger will collect a confirmation sample. If the exceedance is confirmed, the Discharger will cease the injections and continue monthly monitoring of well AR/MW-1A for three months to generate enough data to establish a trend. If the levels, based on the concentration trend, are more than 20 percent above baseline levels, the Discharger will implement the contingency plan. The Discharger will install a groundwater extraction and treatment system and begin extraction of groundwater from extraction wells AR/MW-13A, AR/MW-3A, and AR/MW-8A, treat it, and then discharge it to the sanitary sewer or haul it off-site for disposal. The Discharger will also monitor well AR/MW-1A every other week until the levels decrease to baseline levels and then monthly for at least six months to confirm concentrations remain below baseline levels. 16.Groundwater consistently flows in an easterly direction at an average gradient of 0.0064 feet per foot. AR/MW-1A was selected as the well to evaluate for exceedences because it is about 280 feet east of the proposed injection wells. 17.The injection into waters of the State is subject to regulation under the California Water Code. This Order authorizes the Discharger to inject sodium sulfate, sodium nitrate, and ammonium phosphate into groundwater subject to specific discharge requirements. 18.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. 19.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