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WASTE DISCHARGE REQUIREMENTS ORDER NO. 135-2008-0148 -15- LAWRENCE LIVERMORE NATIONAL SECURITY, LLC AND THE U.S. DEPARTMENT OF ENERGY FOR LAWRENCE LIVERMORE NATIONAL LABORATORY SITE 300 SAN JOAQUIN AND ALAMEDA COUNTIES Buildings 801, 827A, and 836A. Although these specific sources are discharged to percolation pits, they were considered representative of the mechanical equipment and cooling tower discharges to septic systems at Site 300. (See Attachments 5, 6, 18, 19, and 20.). 64.The septic systems at Buildings 813 and 835 receive discharge from washing machines. Clothing from High Explosives Process Area workers is washed in the washing machine at Building 813. The Discharger analyzed the washing machine effluent at these buildings for general minerals, and at Building 813 only, for explosive compounds, as shown in Attachment 7 and Attachment 23, a part of this Order. 65.The Discharger evaluated threat to water quality from laundry water discharges using the DLM. By applying an attenuation factor of 100 for areas where groundwater is greater than 30 feet bgs, the Discharger determined that all constituents detected in the laundry effluent were lower than the DLM values, except for aluminum and iron. Wastewater from the Building 813 washing machine had detections of the high explosives RDX and HMX lower than the DLM value. The Regional Water Board has since concluded that salts do not attenuate so an attenuation factor of one (1) should be applied for salts. In response to this conclusion, the results of the Dischargers' analyses reported in the 28 January 2005 report were revised to reflect an attenuation factor of 1 for salts, as shown on Attachment 24, a part of this Order. Concentrations of conductivity (measured as SC), sodium, and TDS in the laundry effluent exceed water quality goals. The study discussed in Finding 69 will evaluate if any constituents in septic system effluent have the potential to degrade or have degraded groundwater. 66.The septic systems at Site 300 have limited flow, and some are used intermittently. Only six are within 30 feet of groundwater. The septic systems are in remote locations across the site. Connecting to treatment and sewer systems is not practicable. Allowing discharge to these septic systems without secondary treatment is practicable because the septic systems are in remote areas, they have limited use, groundwater is greater than 30 feet bgs at all but six of the septic systems, groundwater below the septic systems is not used for animal or human consumption, and in most cases has limited yield. 67.The groundwater underlying the septic systems is not used on site for livestock or human consumption. The regional aquifer is used for drinking water on site. This water is chlorinated to meet drinking water requirements and is tested regularly. Because San Joaquin County requires an annular seal to extend from ground surface to a depth of 50 feet for agricultural wells