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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2008-0148 -3- LAWRENCE LIVERMORE NATIONAL SECURITY, LLC AND THE U.S. DEPARTMENT OF ENERGY FOR LAWRENCE LIVERMORE NATIONAL LABORATORY SITE 300 SAN JOAQUIN AND ALAMEDA COUNTIES 801 and 836A and other low-threat discharges included in the NPDES permit, listed in Attachment 4, a part of this Order, percolate into the ground and do not reach surface water and therefore did not need to be included in the NPDES permit. Regional Water Board staff concurred with this determination. Discharge from the cooling tower at Building 836A has since been discontinued and discharge from the cooling tower at Building 801 is now directed to a percolation pit. On 4 August 2000, the Regional Water Board rescinded the Discharger's NPDES permit, Order No. 94-131. 10.Lawrence Livermore National Laboratory submitted a Report of Waste Discharge (RWD), dated 19 July 2000, to amend Order No. 96-248 to include: a) Discharges to sewage evaporation and percolation ponds. b) Mechanical equipment room wastewater discharges to percolation pits. c) Cooling tower blowdown and discharges associated with cooling tower maintenance to percolation pits. d) Septic system discharges to septic tanks, leach fields, and cesspools. e) Low threat discharges to ground: primarily low volumes of drinking water, condensates, and uncontaminated contained rainwater that are detailed in Attachment 4, which is attached hereto and made part of this Order. 11.This Order includes the discharges listed in Finding 10 and removes discharges to the Class II Surface Impoundments, which LLNL clean closed in compliance with Title 27 requirements. Closure was completed on 3 November 2005, and the final Clean Closure Report for the Class II Surface Impoundments was submitted on 22 February 2006. 12.On 28 January 2005, in response to a request from the Regional Water Board, the Discharger submitted a technical report containing the analytical results of: a) Representative samples of the wastewater discharges from cooling towers and mechanical equipment to septic systems, percolation pits, and sewage ponds. b) Samples from sewage pond influent and the sewage pond. c) Groundwater samples from monitoring wells upgradient and downgradient of the sewage ponds. The analytical results are included in Attachments 5, 6, 7, 9, 10, 11, 12, 13, 14, 18, 19 and 20, a part of this Order. 13.The report also contained descriptions of the percolation pits and the septic systems across the site, locations of monitoring wells with respect to septic