1. Nicholas School of the Environment, Duke University, 308 Research Drive, LSRC A341, Box 90328, Durham, NC, 27708, USA
2. U.S. Army Engineer Research and Development Center, Environmental Laboratory, 3909 Halls Ferry Rd., Vicksburg, MS, USA
3. United States Consumer Product Safety Commission, 4330 East-West Highway, Bethesda, Maryland 20814, USA
4. National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
5. Civil and Environmental Engineering, Duke University, Durham, NC, 27708, USA
6. Department of Geological and Environmental Sciences, Appalachian State University, Boone, NC 28608, USA