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R. Allan Freeze <br />Department of Geological Sciences <br />University of British Columbia <br />Vancouver, British Columbia <br />John A. Cherry <br />Department of Earth Sciences <br />University of Waterloo <br />161 7 Ct Waterloo, Ontario <br />GROUNDWATER <br />Prentice -Hall, Inc. <br />Englewood Cliffs, New Jersey 07632 <br />