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 report has been reviewed by a group other than the authors according to procedures approved by a Report Review Committee consisting of members of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine.

Support for this project was provided by the U.S. Army Corps of Engineers under contract nos. DACW45-99-P-0492 and DACW45-01-P-0212, and the U.S. Environmental Protection Agency under contract no. X-98804801.

International Standard Book Number: 0-309-08314-1

Library of Congress Control Number: 2002105055

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