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LLNL-AR-788093 <br /> External <br /> 12. CWC 751: Solids or Sludges with Halogenated Organic Compounds <br /> >1000 mg/kg <br /> Site 2018 quantity(lb) <br /> LLNL 8,990 <br /> 12.1 B438 Granular Activated Carbon <br /> Site 2018 quantity (lb) <br /> LLNL 6,717 <br /> Ground water Air strippers remove <br /> pumped from halogen(VOCs etc.) Cleaned water returned <br /> environmental contaminants from to ground <br /> restoration wells water into GAC filters <br /> ESptC filters1) —i disposal <br /> FIGURE III.12.1: B438 GRANULAR ACTIVATED CARBON PEROCESS <br /> Contaminated ground water is pumped from wells throughout the site as part of ongoing <br /> environmental restoration efforts. Air strippers bubble air through grates as the water flows <br /> through to remove halogenated contaminants, such as VOCs, which are trapped in the <br /> granular activated carbon (GAC) filters through carbon adsorption. Both the air and water <br /> effluents from this process are monitored and tested regularly. <br /> To minimize waste and extend the useful life of the filters, they are only changed out when <br /> the analytical indicates they reach saturation. As the ground water becomes less <br /> contaminated, the filters may last for several years without changeout. <br /> SOURCE REDUCTION/POLLUTION PREVENTION EVALUATION <br /> Description of Measure: <br /> LLNL plans to continue existing best management practices to minimize this waste <br /> stream. No other source reduction/pollution prevention measures are planned. <br /> September 1, 2019 SB 14 Plan I I1-13 <br /> ESH-EFA-P2S-19-16592 <br />