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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2008-0148 -16- LAWRENCE LIVERMORE NATIONAL SECURITY, LLC AND THE U.S. DEPARTMENT OF ENERGY FOR LAWRENCE LIVERMORE NATIONAL LABORATORY SITE 300 SAN JOAQUIN AND ALAMEDA COUNTIES and 100 feet for drinking water supply wells, groundwater within 50 feet of the septic systems is not available for agricultural, municipal, or domestic use. 68.The Discharger has not evaluated the potential for domestic wastewater discharges to the septic systems to impact beneficial uses of groundwater. Also, the Discharger does not monitor the groundwater specifically for impact of discharges from septic systems to groundwater; however, groundwater monitoring wells installed for the CERCLA investigations exist in the general vicinity of most of the septic systems. The Discharger monitors for a wide range of constituents associated with the CERCLA project. CERCLA investigations in the areas around Building 812, Building 834, Building 850, and Building 899, have determined that nitrate concentrations in groundwater exceed the drinking water MCL. Investigations in these areas have attributed the source of the nitrate at least in part to the septic systems. This Order requires the Discharger to monitor existing groundwater monitoring wells in the vicinity of these four septic systems as described in the MRP. 69.This Order requires the Discharger to evaluate if groundwater is impacted or may be impacted by the septic systems, as described below in Provision 8. If any septic systems have degraded groundwater, the Discharger will be required to monitor groundwater up and downgradient of those septic systems and to submit a feasibility study proposing remedial alternatives to restore beneficial uses of groundwater if it is determined by the Regional Water Board that the groundwater has been unreasonably degraded. The Discharger shall include a proposal for implementing a source control program and BPT to reduce pollutants in the discharge. Low Threat Discharges 70.The Discharger conducts a variety of activities at Site 300 that may result in low volume and low-threat discharges. Consistent with the Storm Water Pollution Prevention Program, the discharger has implemented Best Management Practices (BMPs) to prevent these discharges from reaching surface water drainage courses, thus these discharges percolate into the ground. The discharges detailed in Attachment 4 are primarily composed of potable water, low conductivity water, condensate, and uncontaminated contained rainwater. These discharges may occur at any of the facilities and outdoor areas at Site 300. 71.The Discharger evaluated the low threat discharges in a technical report submitted in 1994. These discharges did not contain any constituents that would negatively affect groundwater and are discharged in low volumes,