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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2008-0148 1 LAWRENCE LIVERMORE NATIONAL SECURITY, LLC AND THE U.S. DEPARTMENT OF ENERGY FOR LAWRENCE LIVERMORE NATIONAL LABORATORY SITE 300 SAN JOAQUIN AND ALAMEDA COUNTIES ATTACHMENT 4 Description of Site 300 low threat discharges to ground along with required Best Management Practices Type of discharge Best management practices estimated volume Water Minor discharges primarily associated with maintenance and operations of potable, deionized water or low-conductivity (varies, one time discharges from water systems. Large volume discharges reaching surface a few gallons up to 5,000 gallons) waters are permitted by NPDES permit CAG9950001. Small discharge volumes of potable, deionized water or low- conductivity water may be allowed to evaporate or percolate into the ground to prevent discharge directly into storm drain or surface water. Minimize erosion during discharge. Air conditioner and compressor Condensate must evaporate or percolate into the ground. condensate Direct discharge to storm drain or surface waters is prohibited. (at most continuous drip) No treatment chemicals are added. Units that discharge elevated metals as a result of corrosion in the system have condensate captured and characterized for proper dis osal. Landscape irrigation Excess runoff must evaporate or percolate into the ground to prevent discharge directly into storm drain or surface water. (varies from 10 to 300 gallons) Minimize use of water to prevent excess runoff. Follow BMPs for pesticide and fertilizer application. Pavement, building and window Excess water must evaporate or percolate into the ground to washing and equipment rinsing prevent discharge directly into storm drain or surface water. (varies from 10 to 300 gallons) Use no soaps, detergents, or other cleaning chemicals. Use dry-cleaning methods for pavement cleaning when possible. Use water only when deemed necessary. Care is taken to ensure that water-washed areas have had no spills of toxic or hazardous materials, or that the spills were properly cleaned prior to any washing activity. Minimize water use. Culvert flushing Culverts are visually inspected annually and cleaned when needed. Cleaning involves removing accumulated sediments (varies from 100 to 5000 gallons) either with a backhoe or hand digging. Residual sediments may be flushed from the culvert with potable water. Removed sediments are used to reinforce channel banks or removed from the drainage channel for disposal or reuse elsewhere at Site 300. Continued