Linden Kay Greenhalgh1, Michael J. McFarland2, MaiAnh Vutran2, Issaak R. Vasquez2, Mark Schmitz3, and Robert B. Brobst4. (1) Cooperative Extension, Utah State University, 151 N. Main, Tooele, UT 84074, (2) Civil and Environmental Engineering, Utah State University, Logan, UT 84322-4110, (3) Division of Water Quality, Utah Department of Environmental Quality, P.O. Box 144870, Salt Lake City, UT 84114-4870, (4) US EPA Region 8, 1595 Wynkoop Street, Denver, CO 80202-1129