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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2008-0148 -10- LAWRENCE LIVERMORE NATIONAL SECURITY, LLC AND THE U.S. DEPARTMENT OF ENERGY FOR LAWRENCE LIVERMORE NATIONAL LABORATORY SITE 300 SAN JOAQUIN AND ALAMEDA COUNTIES wastewater percolation pits is 150 gpd each for Buildings 827A, C, D and E and 50 gpd for Building 806A. 39.The High Explosives Process Area and Chemistry Area are underlain by an unsaturated zone ranging from 50 to over 130 feet thick, which consists of interbedded claystone, siltstone and sandstone. Attachment 15, a part of this Order, provides a summary of the percolation pits, waste streams, up and down-gradient monitoring wells and depths to first water-bearing zones. Additional wells may be identified as up and downgradient monitoring wells after the required studies are completed, as described in Provision 5 and discussed in Finding 46. 40.The average hydraulic conductivity of the TnbsZ is 0.001 cm/sec and the hydraulic gradient is 0.05 to the south-southeast. 41 . Land within 1,000 feet of Buildings 806 and 827 A through E is used by Site 300 as open space and for other buildings used for explosives formulation, processing, and storage. 42.The mechanical equipment wastewater percolation pits, constructed in 1995, are rectangular excavations (ranging from 4x3x3 to 7x6x6 feet) filled with drain rock over which is a geotextile filter fabric and a concrete cap. The design flow rate of each of the percolation pits at Buildings 827 A, C, D, and E is 150 gpd and at Building 806 is 50 gpd. 43.The Discharger has registered the mechanical equipment wastewater percolation pits as Class V Injection Wells with the US EPA. 44.At the request of the Regional Water Board, the Discharger submitted technical reports on the quality of the mechanical equipment wastewater in 1994 and in 2005. In 1994 and 2004, the Discharger analyzed the wastewater for analytes suspected to be in the wastewater. In 1994, the analyses included general minerals, VOCs, oil and grease, and metals. In 2004, the analyses included general minerals, oil and grease and metals, as shown on Attachments 5 and 6. VOCs were not analyzed in 2004 because they were not detected in 1994. 45.The Discharger used the Designated Level Methodology (DLM) to evaluate the potential for the mechanical equipment wastewater discharged to percolation pits to impact beneficial uses of underlying groundwater. The lowest appropriate water quality limits protective of beneficial uses of groundwater were selected for the model endpoints. By applying an attenuation factor of 100 for areas where groundwater is greater than