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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2008-0148 -6- LAWRENCE LIVERMORE NATIONAL SECURITY, LLC AND THE U.S. DEPARTMENT OF ENERGY FOR LAWRENCE LIVERMORE NATIONAL LABORATORY SITE 300 SAN JOAQUIN AND ALAMEDA COUNTIES not unreasonably affect beneficial uses, and will not result in water quality less than that described in the State Water Board's policies. 21.The Water Quality Control Plan, Central Valley Region, Fourth Edition (Basin Plan) designates the beneficial uses of groundwater underlying Site 300 as municipal and domestic, agricultural, and industrial supply. The property is not conducive to growing of crops. The most likely agricultural beneficial use would be livestock watering. DESCRIPTION OF WASTES AND WASTE UNITS Sewage Evaporation and Percolation Ponds - Domestic and Industrial Waste Ponds 22.The location of the sewage evaporation and percolation ponds is shown on Attachment 2. The sewage evaporation pond discharges to the percolation pond when the capacity of the sewage evaporation pond is exceeded. 23.The sewage evaporation pond receives domestic and mechanical equipment wastewater from Buildings 870, 871, 872, 873, 874, 875, 876, 877, 878, 879 and 880. Domestic wastewater generated at these Site 300 buildings includes discharges of sanitary wastes from restroom and shower facilities, washing machines, kitchens, and housekeeping activities. Mechanical equipment wastewater discharges generated at these facilities include discharges from boilers, vacuum pumps, pressure relief valves on hot water/steam equipment, humidifiers, filter drains, and water softeners, as well as condensate from air compressors, air conditioners, and refrigeration units. The Discharger sampled and analyzed wastewater discharges from mechanical equipment in the Buildings 806 and the 827 Complex. Because the sources of the wastewater at these buildings are similar to those which discharge to the sewage evaporation pond, the analytical results were determined to be representative of mechanical equipment discharges to the sewage evaporation pond. Attachments 5 and 6 show analytical results from the mechanical equipment discharges. The Discharger also analyzed washing machine effluent from Building 873. Attachment 7 shows the analytical results from the washing machine. The results on Attachments 5 and 6 show that the discharge to the sewage pond has the potential to degrade groundwater if overflow from the sewage evaporation pond to the sewage percolation pond occurs. 24.The sewage ponds are underlain by approximately 35 feet of Quaternary alluvium that consists of clay, silt, sand, and gravel lenses. The alluvium