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<br />topography, hydrologic features, irrigated areas (for irrigation projects), and the locations <br />and condition of existing structures. Land classification work should be performed per <br />section 4.2.6. of this chapter for potential irrigated areas. Field investigations for <br />hydrologic and water quality analyses should be conducted to meet the guidelines set <br />forth in sections 4.2.7. and 4.2.8. of this chapter. <br /> <br />For all major structures, the feasibility report should describe site conditions, engineering <br />geology, geologic mapping, source and availability of construction materials, and <br />subsurface investigations used in the design of the structure. At sites where geologic <br />conditions are poor or may require intensive exploration and evaluation, a <br />comprehensive report by a qualified engineering geologist may be necessary. <br /> <br />4.2.]0 Formulation and Evaluation of Alternatives <br /> <br />Each feasibility investigation should include a reasonable number of alternatives which <br />are developed and evaluated in accordance with the General Planning Guidelines in <br />Chapter 2 and the evaluation factors in Appendix B. The number of alternatives to be <br />developed and the extent of the evaluations will depend upon the objective and scope <br />of the feasibility study. <br /> <br />The results of the alternatives evaluation should be fully described in the feasibility <br />report. The report should identify the differences between alternatives and should <br />describe the process used in selecting onl~ of the alternatives as the prefelTed plan for <br />project implementation. <br /> <br />4.2.]] Description of Selected Plan <br /> <br />A detailed description of the selected alternative should be provided in the feasibility <br />report. The description should include each of the following listed items: <br /> <br />a. A narrative description of project operation to indicate how the entire project <br />will function and to describe the functional relationships between project <br />components. <br /> <br />b. A map of the entire project area showing the locations of existing and proposed <br />project components. The map should also show the location of existing or <br />proposed facilities relative to any designated floodplain and should indicate any <br />areas which might be inundated by operation of the facilities such as the <br />spillway inundation zone. <br /> <br />c. Layout and sections for each major structure and typical minor structures to <br />include dimensions and hydraulic properties. Profile and typical sections for <br />canals and pipelines with water surface and hydraulic gradeline elevations should <br />be appended to the main report. <br /> <br />25 <br />