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December 2007 Georgetown – Final Alternatives Analysis Report <br />page 6 <br />The comparative analysis of the three alternatives with respect to cost, durability, reliability, vulnerability, <br />ease of operation and maintenance, constructability, timeliness of construction, opinion of agency <br />acceptability, hydro impact / siphon removal, need for a dry condition during construction, and potential <br />spillway blockages is provided in the table on the following page. <br />The terminology used for comparison shall be interpreted as follows: <br />x Excellent – Minor, if any, problems anticipated <br />x Good – A few problems anticipated <br />x Fair – A moderate amount of problems anticipated <br />x Difficult – Many problems anticipated <br />x Low – Low chance of occurrence <br />x Moderate – Medium chance of occurrence <br />x High – High chance of occurrence