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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. 91-052 NPDES NO. CA0082651 WASTE DISCHARGE REQUIREMENTS FOR UNIVERSITY OF CALIFORNIA LAWRENCE LIVERMORE NATIONAL LABORATORY SITE 300 AND U. S. DEPARTMENT OF ENERGY ALAMEDA AND SAN JOAQUIN COUNTIES The California Regional Water Quality Control Board, Central Valley Region, (hereafter Board) finds that: 1. The University of California, Lawrence Livermore National Laboratory (LLNL) Site 300 and the U.S. Department of Energy (hereafter jointly referred to as Discharger) , submitted a Report of Waste Discharge (RWD) dated 2 February 1990, to discharge waste under the National Pollutant Discharge Elimination System (NPDES). The Discharger submitted supplemental information on 7 May 1990, 16 May 1990, and 19 December 1990. 2. The Discharger proposes to discharge waste from a ground water treatment system (GWTS) in the General Services Area (GSA) into Corral Hollow Creek, a water of the United States, at a point in the NW quarter of Section 36, T3S, R4E, MDB&M, as shown on Attachment A, a part of this Order. 3. In August 1990 LLNL Site 300 was placed on the Environmental Protection Agency' s (EPA) National Priorities List (NPL or Superfund list). A Federal Facilities Agreement (FFA) is being negotiated among LLNL, DOE, EPA, and the State (Regional Board and Department of Health Services). The FFA will contain compliance time schedules for completion of remedial investigations, feasibility studies, and remedial actions. 4. Several plumes of halogenated volatile organic compounds (VOCs) have polluted shallow aquifers beneath the GSA and adjacent private property, and threaten to contaminate nearby private water supply wells. The Discharger monitors the water supply wells for VOCs and has detected none. The eastern GSA plume extends down the Corral Hollow Creek drainage for about 4,000 feet in the permeable, shallow alluvial deposits. The plume's extent has not been defined, and the Discharger is continuing an investigation to determine the boundary. 5. The Discharger proposes to discharge from a GWTS dedicated to treating the ground water pumped from extraction well W-26R-03 in the eastern GSA to Corral Hollow Creek through Outfall 5C. The GWTS and the discharge outfall location are shown in Attachment B, a part of this Order.