1. Department of Civil and Environmental Engineering, University of Iowa, Iowa City, Iowa 52242, United States
2. Center for Health Effects of Environmental Contamination, University of Iowa, 251 North Capitol Street, Chemistry Building, Room W195, Iowa City, Iowa 52242, United States
3. Public Policy Center, University of Iowa, 310 South Grand Ave., 209 South Quadrangle, Iowa City, Iowa 52242, United States
4. Charles E. Via, Jr. Department of Civil and Environmental Engineering, Virginia Tech, 1145 Perry St., 418 Durham Hall, Blacksburg, Virginia 24061, United States