| Affiliation: | Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831–6400. Oak Ridge National Laboratory is managed by Lockheed Martin Energy Research Corp. for the U.S. Department of Energy under contract number DE-AC05–96OR22464. Currently at: Temple University, Department of Geology, Philadelphia, PA 19122. E-mail:;Texas Institute for Computing and Applied Mathematics, University of Texas, Austin, TX 78712.;Department of Geology, Auburn University, Auburn, AL 36849–5305. |
