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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2008-0148 -26- <br /> LAWRENCE LIVERMORE NATIONAL SECURITY, LLC AND <br /> THE U.S. DEPARTMENT OF ENERGY FOR <br /> LAWRENCE LIVERMORE NATIONAL LABORATORY SITE 300 <br /> SAN JOAQUIN AND ALAMEDA COUNTIES <br /> for completing the work, which shall become a part of this Order. <br /> 7. One month after receiving the first four consecutive quarters of <br /> groundwater monitoring results, the Discharger shall submit to the <br /> Regional Water Board an evaluation of the monitoring. If the monitoring <br /> shows that the beneficial uses of groundwater have been impacted by <br /> percolation pit discharges, upon request of the Executive Officer the <br /> Discharger must submit a feasibility study proposing remedial alternatives to <br /> restore beneficial uses to the groundwater. The feasibility study shall include <br /> a schedule for completing the work, which shall become a part of this Order. <br /> The Discharger must include a proposal for implementing a source control <br /> program and best practicable technology (BPT) to reduce pollutants in the <br /> discharge. The Regional Water Board may reopen this Order to include <br /> additional requirements resulting from the above submitted studies. <br /> 8. By 1 March 2009, the Discharger shall submit to the Regional Water Board a <br /> work plan for review and concurrence to evaluate the impacts or potential <br /> impacts to groundwater by Site 300 septic systems. The evaluation shall be <br /> based on the location of each septic system discharge zone (e.g. leachfield), <br /> the use of the septic systems, depths to groundwater, geology below the <br /> systems, monitoring wells in the vicinity of the system including monitoring <br /> wells potentially upgradient and downgradient of the discharge zone, and any <br /> available data on groundwater and effluent quality. The evaluation shall <br /> summarize available data for nutrients, fecal and total coliform, trace <br /> organics, general minerals or other analyses such as isotopic signatures that <br /> may indicate a septic system impact on groundwater. The work plan shall <br /> include a schedule for completing the work and submitting the final <br /> evaluation, which shall become a part of this Order. <br /> 9. If the Regional Water Board determines from review of the evaluation report <br /> that the effluent from septic systems poses a threat to groundwater, upon <br /> request of the Executive Officer the Discharger shall submit a work plan to the <br /> Regional Water Board for review and concurrence to install groundwater <br /> monitoring wells to determine if beneficial uses are being impacted. The work <br /> plan shall include a schedule for completing the work, which shall become a <br /> part of this Order. <br /> 10.One month after receiving the first four consecutive quarters of <br /> groundwater monitoring results, the Discharger shall submit to the <br /> Regional Water Board an evaluation of the monitoring. If the monitoring <br /> shows that the beneficial uses of groundwater have been impacted by septic <br />