JACOBS, Michael A., Pioneer Natural Resources, Midland, TX 79706, SMITH, Bruce D., U.S. Geological Survey, Denver Federal Center, Bld 20, ms964, Lakewood, CO 80225, and
TYRRELL, Christa, Geosyntec Consultants, 1201 Third Avenue, Suite 330, Seattle, WA 98101, ctyrrell@geosyntec.com