I am just beginning to think about using chlorine isotope analyses as a tool for investigating the origin of salinity in surface and ground waters. Can anyone suggest a contact person or laboratory that I might contact for further specific information on this topic? Thanks! Kathy ******************************** Kathleen A. McCarthy U.S. Geological Survey 10615 SE Cherry Blossom Drive Portland, OR 97216 (503) 251-3257 FAX: (503) 251 3470 [log in to unmask] ********************************