and is an adjunct faculty member in the Department of Soil and Environmental Science at the University of California, Riverside. Some specializations of Dr. Yates include soil physics and hydrology; spatial variability and geostatistical methods; modeling the transport of microorganisms; and analytical and numerical solution methods applied to hydrologic and soil physical problems.

JAMES R. WALLIS (through 10/18/91) received his B.S. in forestry from the University of New Brunswick, his M.S. from Oregon State University, and his Ph.D. in Soil Morphology from University of California, Berkeley. Currently he is a Research Staff Member at the IBM Thomas J. Watson Research Center, where he has been since 1967. Previously, he held positions in hydrology and forestry with the U.S. Forest Service, Montana State University, and elsewhere. His principal interests are in mathematical models applied to hydrology, soils, forestry, and land management. He has lectured at many different universities and has addressed many issues relevant to estimates of extreme floods. He has served on many NRC committees and is a former member of the Water Science and Technology Board.

PATRICIA L. CICERO received her B.A. in Mathematics from Kenyon College. She worked as Senior Project Assistant at the National Research Council's Water Science and Technology Board (WSTB). Currently, she is attending the University of Wisconsin, Madison for her master's in Water Resources Management. Ms. Cicero has worked on a variety of studies at the WSTB, including ones on international soil and water research and development, wastewater management in coastal urban areas, techniques for assessing ground water vulnerability, and the environmental effects of the operations at Glen Canyon Dam on the lower Colorado River.

SARAH CONNICK earned her A.B. in Chemistry from Bryn Mawr College and her M.S. in Environmental Engineering from Stanford University. She is a Senior Staff Officer with the National Research Council's (NRC) WSTB where she directs studies of wastewater management in coastal urban areas, techniques for assessing ground water vulnerability, and Antarctic policy and science. Prior to joining the WSTB staff, Ms. Connick was a Staff Officer for the NRC's Committee to Provide Interim Oversight of the Department of Energy Nuclear Weapons Complex.