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U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2008–5059

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Acknowledgments

The author would like to thank the many people that contributed their time and knowledge to help complete this study. Mary Stephens (City of Portland), Andrew Swanson (Clackamas County’s Water Environment Services), Kim Peoples (Multnomah County), and Barbara Adkins (City of Gresham) are acknowledged gratefully for providing direction for the study and assistance to help fund the project through their agencies. Mark Liebe (City of Portland) made a substantial contribution through his many useful thought-provoking discussions and his tireless support of the study. Gratitude is expressed to the many well owners who have permitted access to their wells, well constructors who have diligently recorded and reported their findings, and the many people and agencies that collect, analyze, maintain, or disseminate the scientific data needed for studies of ground-water systems. Current or former USGS employees include Joseph Miller, Tana Haluska, Jacqueline Olson, and Danial Polette, who provided numerous GIS analyses that facilitated the interpretation of the data and presentation of the results; Jonathan Haynes, Charley Palmer, and Kevin Knutson, who provided valuable collection of field data to supplement the knowledge of the ground-water system; Leonard Orzol and Tiffany Jacklin, whose expertise greatly simplified access to existing data; and the many other USGS employees whose everyday efforts go to support this and many other studies.

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