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For ground water cleanup LLNL/DOE will use existing monitor wells to extract contaminated <br />water. Air will then be passed through the water to remove the chemicals (forced air stripping). <br />The air will then be routed through the same granular activated carbon filter used for soil vapor <br />extraction to remove the contaminants from the air. Used carbon filters from soil and water <br />treatment will be taken off-site for recycling or disposal. <br />The cleaned water will be stored in a holding tank where it will be tested to make sure it meets <br />treatment requirements set by the Regional Water Quality Control Board. LLNL/DOE will report <br />results to the Board quarterly. Once LLNL/DOE has confirmed that the treated water is clean (to <br />better than drinking water standards), it will be "misted" onto a hillside near Building 834, away <br />from the area of contamination. Misting the cleaned water will help it evaporate, reducing the <br />potential for erosion. It will also prevent the water from soaking back into the contaminated <br />shallow ground water. <br />At peak capacity, the ground water system will be able to treat about 2,000 gallons of water per <br />day. However, LLNL/DOE expects the first few months to go much more slowly as the system's <br />efficiency is optimized. <br />Both of these treatment technologies have been tested and proven successful in treating <br />contamination at Site 300. They are also used at other sites around the country to treat similar <br />problems. The system at Site 300, however, will allow investigators to test new technologies <br />while relying on proven technologies for final treatment. The system has been modified slightly <br />to enable investigators to test other systems by sending small amounts of extracted water through <br />them for treatment. In this way they hope to continue improving the efficiency of the system <br />being used in the Building 834 cleanup. <br />Start-up testing of the Building 834 interim cleanup system began March 2, 1994. If you have <br />any comments or questions about this cleanup effort or the Site 300 environmental restoration <br />project in general, please contact me at the address/phone below. <br />Sincerely, <br />Bert Heffner <br />Manager, Area Relations <br />Lawrence Livermore National Laboratory <br />P.O. Box 808, L-790 <br />Livermore, CA 94551 <br />(510) 424-4026 <br />