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7 7- -Y'19 3 <br />HELTON & WILLIAMSEN, P.C. <br />• <br />Thomas A. Williamsen <br />EDUCATION: <br />University of Nebraska - B. S. Agricultural Engineering, 1973 <br />University of Colorado - Graduate studies in Civil Engineering <br />SOCIETIES: <br />American Society of Agricultural Engineers RECEI <br />American Society of Agronomy rAl ?/?D <br />U.S. Committee on Irrigation and Drainage 3 <br />?011 <br />REGISTRATION: Division OfReciam <br />Mining Safe anon, <br />Registered Professional Engineer in Colorado ty <br />EXPERIENCE: <br />2004- Helton & Williamsen, P.C., Englewood, Colorado <br />President <br />• 1993-2004 Helton & Williamsen, P.C., Englewood, Colorado <br />Vice President - Provides engineering consulting services in water resources <br />specializing in water right, hydrologic, and watershed investigations. With respect <br />to water rights, this includes documenting historical water use practices; estimating <br />historical consumptive use; evaluating impacts of changes in points of diversion, <br />types of use, and places of use. Performs ground water analyses including <br />determinations of depletions for "not non-tributary ground water" under S.B. 5 <br />criteria. Provides expert testimony in water court and other formal settings. Recent <br />projects in the upper Eagle River basin for a consortium of municipal and ski area <br />clients include estimating the yield of a reservoir project for municipal, snowmaking, <br />water quality, and streamflow enhancement; evaluating the impacts on streamflow <br />caused by development of certain transmountain diversion projects; assessing the <br />water uses by local entities and the streamflow depletions; and formulating a <br />change of water rights whereby two municipal water supply systems are <br />interconnected in order to enhance streamflows for particular stream segments in <br />the winter and to relieve demands on a treatment plant during the summer. <br />1982-92 Tipton and Kalmbach, Inc., Denver, Colorado. <br />Senior Engineer - Conducted hydrologic and water right investigations, including <br />reservoir operation studies, streamflow analyses and historical consumptive use, <br />return flow, and water demand analyses. Assessed the impacts of water right <br />transfers and plans for augmentation, prepared technical reports and trial exhibits <br />in support of testimony, and water right and well permit applications. Prepared <br />computer models to aid in the efficient analysis of water projects. Developed <br />computer packages to provide efficient and easy-to-use accounting of water uses <br />• for complex water supply systems.