1. Retired; Vice President, Weston Solutions, Inc., 1400 Weston Way, West Chester, PA 19380.
2. President, Snyder Environmental Engineering Associates, 3044 Appledale Rd., Audubon, PA 19403 (corresponding author).
3. Project Manager, Weston Solutions, Inc., 1400 Weston Way, West Chester, PA 19380.
4. Project Engineer, Aqua Pennsylvania, 762 Lancaster Ave., Bryn Mawr, PA 19010.