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Long Hollow Reservoir Feasibility Study 3.0 DESIGN DATA 3.1 Topography and Feasibility Level Study Drawings Pacific Western Technologies, Ltd. (PWT) of Albuquerque, New Mexico prepared the topography for this study. PWT, under contract with the LPWCD, obtained aerial photographs on February 23, 2002 and generated color digital orthophotos and a digital terrain model for the LHR site. Color stereo photographs, together with ground survey control points, were used to generate a topographic map of the site with 2-foot contour intervals. PWT prepared electronic and Mylar copies of LHR topographic mapping, as well as color digital orthophotos. This base mapping was used for various LHR feasibility study tasks, such as the geologic reconnaissance study, the wetlands delineation, the cultural resources evaluation, and the design. WWE added 20-foot-contour topography from the United States Geological Survey (USGS) in the vicinity of the reservoir. The USGS' topography was taken from the Red Mesa, Colorado quadrangle. Feasibility level drawings developed for this study are presented in Exhibits 3.1-1 through 3.1-5 at the end of this report in 11 "-x-17" format. A compact disk containing the drawings is provided in Appendix F of Volume II. The drawings, which will be referred to throughout this report, were developed by combining what appears to be the most advantageous alternative for the dam and appurtenant structures based on available data. In some cases, the ~most advantageous alternative is not yet apparent because of the lack of data andlor the need for detailed analyses that will be done during design. In the cases where the most advantageous alternative was not apparent, we included an alternative, with an associated cost, which will be adequate to cover the final construction costs. 991-077.120 Wright Water Engineers, Inc. Page 11 April 2005