I'd be inclined to respond and ask for references that you could contact independently. Robert J. Goldstein, Ph.D. Robert J. Goldstein & Associates, Inc. Environmental Consultants 8480 Garvey Drive Raleigh, NC 27616 USA tel (919) 872-1174 fax (919) 872-9214 URL www.rjgaCarolina.com e-mail rgoldstein at rjgaCarolina_com To join the AKA see http://www.aka.org/pages/join.html