1. Office of Research and Development, Center for Environmental Solutions and Emergency Response, United States Environmental Protection Agency, Research Triangle Park, NC, USA
2. Office of Research and Development, Center for Environmental Solutions and Emergency Response, United States Environmental Protection Agency, Cincinnati, OH, USA
3. Office of Emergency Management, United States Environmental Protection Agency, Research Triangle Park, NC, USA
4. Homeland Security Research Department, Jacobs Technology, Inc., Research Triangle Park, NC, USA