Groundwater Quality in the Columbia Plateau and Snake River Plain Basin-Fill and Basaltic-Rock Aquifers and the Hawaiian Volcanic-Rock Aquifers, Washington, Idaho, and Hawaii, 1993--2005 Rupert, Michael G. and Hunt, Charles D. and Skinner, K. D. (Kenneth D.) and Frans, Lonna M. and Mahler, B. J. (Barbara June)