1. Chrissy Dangel, MPH, is a Public Health Scientist, and Steven C. Allgeier, MS, is an Environmental Engineer; both in the Office of Ground Water and Drinking Water, Water Security Division, U.S. Environmental Protection Agency, Cincinnati, Ohio. Darcy Gibbons, MS, is an Environmental Health Scientist, Computer Sciences Corporation, Alexandria, Virginia. Adam Haas, MS, is an Environmental Scientist, and Katie Simon, MPH, is a Public Health Scientist; both at Computer Sciences Corporation, Cincinnati, Ohio.