1. Project Manager, Bureau of Release Prevention, New Jersey Dept. of Environmental Protection, P.O. Box 424, 22 S. Clinton Ave., 3rd Floor, Trenton, NJ 08625; formerly, Assistant Professor of Environmental Engineering, School of Environmental Science, Engineering and Policy, Drexel Univ., Philadelphia, PA 19104. E-mail: LandfillGasMicrobiology@verizon.net