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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2008-0148 -25- LAWRENCE LIVERMORE NATIONAL SECURITY, LLC AND THE U.S. DEPARTMENT OF ENERGY FOR LAWRENCE LIVERMORE NATIONAL LABORATORY SITE 300 SAN JOAQUIN AND ALAMEDA COUNTIES 2. The Discharger shall submit an RWD to the Regional Water Board in advance of discharging any new mechanical equipment waste stream or cooling tower waste stream to a septic system. The RWD shall include an evaluation of any potential impact to groundwater quality posed by the waste stream. The new discharge shall not occur until this Order is revised in response to the RWD. 3. By 1 March 2010 the Discharger shall prepare a final salinity evaluation and minimization plan to address the sources of salinity in cooling tower and mechanical equipment effluent. The evaluation and minimization plan shall include: a) Identification of the sources or potential sources of salinity in cooling tower and mechanical equipment effluent and an estimate of the contributions of salinity from these sources. b) An estimate of potential reductions that may be attained through controllable sources. c) A description of the tasks, costs and time required to investigate and to implement the source reduction elements of the minimization plan. d) An analysis, to the extent feasible, of any adverse environmental impacts, including the impact to water conservation, that may result from the implementation of the salinity minimization program. e) Progress to date in reducing the concentration and/or mass of salinity in the effluent. 4. The Discharger shall include progress reports on the salinity evaluation and minimization plan in the semi annual monitoring reports. 5. By 1 March 2009 the Discharger shall submit to the Regional Water Board for review and concurrence a work plan to sample effluent to the percolation pits and to model and otherwise evaluate the potential for salts in the mechanical equipment and cooling tower effluent to impact groundwater beneficial uses. In addition, the work plan will identify monitoring wells that can be used to determine background concentrations for salts in groundwater and monitoring wells that could be used to monitor groundwater downgradient of the percolation pits. The work plan shall include a schedule for completing the work and submitting the final evaluation, which shall become a part of this Order. 6. If it is determined through monitoring and modeling that the salts in the effluent from cooling towers and mechanical equipment have the potential to impact beneficial uses of groundwater, upon request of the Executive Officer the Discharger shall submit to the Regional Water Board for review and concurrence a work plan to install groundwater monitoring wells to determine if beneficial uses are being impacted. The work plan shall include a schedule