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NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee responsible for the report were chosen for their special competences and with regard for appropriate balance.

This study was supported by U.S. Department of Energy contract #DE-AM01-04PI45013. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the organizations or agencies that provided support for the project.

International Standard Book Number-10: 0-309-10338-X

International Standard Book Number-13: 978-0-309-10338-1

Cover: Top left and top right photos courtesy of the U.S. Department of Energy Hanford site website. Middle left photo courtesy of the U.S. Department of Energy Oak Ridge office. Selection and use of these photos are not related to the findings and recommendations expressed in the report.

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