1. a Envirogen, Inc. , 480 Neponset Street, Canton, MA, 02021
2. b Dept. of Civil and Environmental Engineering , University of Massachusetts Lowell , One University Avenue, Lowell, MA, 01854
3. c Chemistry Dept , University of Massachusetts Lowell , One University Avenue, Lowell, MA, 01854
4. d Massachusetts Department of Environmental Protection , Wobum, MA