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WASTE DISCHARGE REQUIREMENTS - 4 - <br /> DEFENSE <br /> 4 - <br /> DEFENSE DISTRIBUTION REGION WEST SHARPE <br /> INTERIM GROUND WATER CLEANUP SYSTEM <br /> SAN JOAQUIN COUNTY <br /> Area have been put into operation as a result of the Discharger's compliance with Order No. <br /> 86-038 and other agreements. <br /> 14. DDRW Sharpe has installed an additional ground water extraction and treatment system in the area <br /> between the south balloon and the north balloon areas. The new extraction and treatment system <br /> was started in May 1995 and is known as the Central Area. Disposal of the treated ground water <br /> from the central area system is done via on-site shallow injection system or percolation/ <br /> evaporation ponds. <br /> 15. The U.S. Environmental Protection Agency (EPA) and the Board have classified this discharge as <br /> a minor discharge. <br /> 16. The Board adopted a Water Quality Control Plan, Third Edition for the Sacramento River and San <br /> Joaquin River Basins (hereafter Basin Plan) which contains water quality objectives for waters of <br /> the Basin. These requirements implement the Basin Plan. <br /> 17. Basin Plan Table III-1 contains water quality objectives for trace elements, including arsenic in the <br /> Sacramento-San Joaquin Delta. Receiving Water Limitation D.1. is based on this objective. <br /> 18. Effluent limitations B.1. have been based on Basin Plan prohibition of discharging toxic <br /> constituents in toxic amounts, which includes the following: <br /> Arsenic: The daily maximum level is set at drinking water standards to avoid potential health <br /> impacts from discharge to an empty canal. <br /> Chromium: A monthly median of 11 4g/1 is consistent with other NPDES permits issued in the <br /> area and is a 4 day average- National Ambient Water Quality Criteria. This limit is <br /> technically achievable. <br /> Lead: A weekly average of 3.2µg/l is a 4 day average - National Ambient Water Quality <br /> Criteria based on a receiving water hardness of 100 mg/l as CaCO3. <br /> Mercury: A monthly median of 0.012 µg/t is a 4 day average - National Ambient Water <br /> Quality Criteria and the daily maximum of 2.4 4g/1 is a maximum concentration - <br /> National Ambient Water Quality Criteria. The daily maximum allows for single <br /> excursions without significant non-compliance. <br /> VOCs: These effluent limits are consistent with Order No.87-026 with the exception of the <br /> daily maximum limit which allows for low levels. These limits are consistent with <br /> technically achievable standards for stripping towers. <br />