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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2008-0148 -9- LAWRENCE LIVERMORE NATIONAL SECURITY, LLC AND THE U.S. DEPARTMENT OF ENERGY FOR LAWRENCE LIVERMORE NATIONAL LABORATORY SITE 300 SAN JOAQUIN AND ALAMEDA COUNTIES of this Order. Results of routine monitoring of evaporation sewage pond influent and in-pond samples are show in Attachment 9, of percolation sewage pond influent are shown on Attachment 10, and for groundwater on Attachment 11. Attachments 12, 13, and 14 provide additional water quality monitoring results of sewage evaporation pond influent (cation/anion scan with ion balance, dissolved metals, and nutrients and coliform organisms) collected to support renewal of the WDRs. 36.This Order continues the existing groundwater monitoring program with the addition of two downgradient monitoring wells and analyses for chloride, sulfate, TDS, sodium and metals to the groundwater monitoring program for the sewage ponds. The added constituents were found to be elevated in mechanical equipment discharges and in sewage sludge. 37.During the summer, evaporation from the sewage evaporation pond exceeds the influent flow to the sewage evaporation pond. In order for the sewage evaporation pond to function properly, the Discharger supplements the influent with groundwater from the on-site supply Well 20, when necessary. Under the CERCLA project, in 2005 the Discharger achieved the groundwater cleanup standard for VOCs in the eastern General Services Area (EGSA) and subsequently shut down the groundwater treatment system. The Discharger is required to continue groundwater monitoring to determine if the VOC concentrations increase or "rebound". Should rebound occur, additional treatment may be required under the CERCLA project. If additional groundwater treatment becomes necessary in the EGSA, the Discharger has the option of discharging a portion of the treated groundwater from the EGSA treatment facility to the sewage evaporation pond when water is needed to make up for excessive evaporative losses during the summer. Approximately 1,000 to 1,500 gpd of treated groundwater could be discharged into the sewage evaporation pond during the summer months. Mechanical Equipment Wastewater Percolation Pits 38.The five mechanical equipment wastewater percolation pits receive mechanical equipment wastewater from Buildings 806A, 827A, 827C, 827D, and 827E, which are in the High Explosives Process Area and Chemistry Area in the southeast area of the site. The buildings that have mechanical equipment percolation pits are shown on Attachment 2. The percolation pits are approximately 50 to 200 feet from the buildings. Mechanical equipment wastewater includes 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. Maximum discharge to the mechanical equipment