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INFORMATION SHEET ORDER NO. R5-2008-0148 4 LAWRENCE LIVERMORE NATIONAL SECURITY, LLC AND THE U.S. DEPARTMENT OF ENERGY FOR LAWRENCE LIVERMORE NATIONAL LABORATORY SITE 300 SAN JOAQUIN AND ALAMEDA COUNTIES Domestic waste is discharged to all of the septic systems. Domestic waste includes discharges of sanitary wastes from restroom and shower facilities, washing machines, kitchens, and housekeeping activities. Cooling tower and mechanical equipment wastewater is discharged to 12 septic systems at Buildings 801, 802, 805, 813, 819, 825, 826, 830, 833/835, 834A, 850, and 851 . Mechanical equipment wastewater may include discharges from boilers, vacuum pumps, pressure relief valves on hot water/steam equipment, humidifiers, filter drains, and water softeners, as well as condensates from air compressors, air conditioners, and refrigeration units. Washing machines discharge to the septic systems at Buildings 813 and 835. Mechanical equipment, cooling tower, and washing machine wastewater discharged to the septic systems contain levels of constituents in the wastewater that exceed water quality goals. The Discharger performed the Designated Level Methodology (DLM) analysis to evaluate the potential for these wastewaters to impact groundwater beneficial uses. The evaluation showed that none of the constituents associated with mechanical equipment or cooling towers should impact beneficial uses of groundwater. Since an attenuation factor was applied to salts and the Regional Water Board has determined that salts do not attenuate as they move through the soils, the Discharger must re-evaluate the potential for discharges of these salts to degrade groundwater. The salts measured as SC, chloride, sodium, sulfate and TDS are above water quality objectives in some of the cooling tower and mechanical equipment wastewater discharges. If the Discharger determines that salts are degrading or have the potential to degrade groundwater, the Regional Water Board will request that the Discharger propose BPT for reducing salt concentrations in discharges and if necessary propose remedial alternatives for restoring water quality. The DLM analysis of washing machine, mechanical equipment and cooling tower wastewater shows that iron and aluminum from the washing machine at Building 835 have the potential to impact ground water. Only the washing machine at Building 813 washes High Explosives Process Area workers' clothes. The effluent from this washing machine contains the high explosives RDX above water quality objectives and HMX above the detection limit. No monitoring wells are downgradient of the septic systems which receive the washing machine discharge. Domestic wastewater discharged to septic systems has the potential to impact groundwater beneficial uses with fecal coliform and nitrate. This Order requires the Discharger to evaluate which septic systems have the potential to impact groundwater and to propose monitoring for those septic systems which have the potential to threaten beneficial uses of groundwater. This Order requires the Discharger to monitor groundwater for nitrate as NO3, total and fecal coliform, and ground water elevation upgradient and downgradient of four septic systems which service Buildings 812, 834, 850, and 899.