PETRONIS, Michael, Environmental Geology, New Mexico Highlands University, Las Vegas, NM 87701, mspetro@nmhu.edu, RAPPRICH, Vladislav, Czech Geological Survey, Klárov 3, 118 21 Praha 1, Prague, Czech Republic, VALENTA, Jan, Institute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic, V Holesovickach 41, 182 09 Praha 8, Prague, Czech Republic, BRISTER, Adam, Environmental Geology, Natural Resource Management Department, New Mexico Highlands University, PO Box 9000, Las Vegas, NM 87701, and VAN WYK DE VRIES, Benjamin, Laboratoire Magmas et Volcans, Blaise Pascal University, Clermont-Ferrand, 63038, France