This book resulted from presentations at theEmerging Technologies in Hazardous Waste Management Symposia held in Pittsburgh,Pennsylvania in September1997, andBoston, Massachusetts in August 1998, and theComputing in Science and Engineering symposium held in Birmingham, Alabama in May1997. Manuscripts submitted fromthese symposia were subjected to peer review and then revised by the authors.Nineteenmanuscripts were selected for inclusion in this volume based uponpeer review, scientificmerit, the editors’ perceptions of lasting value or innovative features, and the general applicability of either the technology itself or the scientific methods andscholarly details provided by the authors