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-19- <br />and partial slope protection as discussed for Option A -2. A new outlet work will be <br />required for Dam 1. Approximately 3.2 miles of county road would be relocated above <br />the flood pool and a new county bridge will be constructed over the inlet canal. <br />Option C -2: This option is similar to Option C -1 with the exception that a new dam will <br />be constructed downstream of existing Dam 2. The new dam will have adequate <br />foundation treatment consisting of slurry trench or cut and coverArench and upstream <br />slope protection along with new outlet works. The county':road and bridge construction <br />would be similar to that in Option C -1. This w 11 result in additional storage of 10,800 <br />acre -feet. <br />Option C -3: This option is similar to Option C -2 with the exceptions that a new, single, <br />long embankment encompassing the area below Dams 1 A, 2 and 3 will be constructed <br />and Dam 1 will also be replaced with a new dam -downstream. As in the above option, <br />the work will consist of construction in the embankment with adequate foundation <br />treatment and slope protection. Approximately 5.5 miles of county road would be <br />relocated and a new bridge constructed over the inlet canal. This option will result in <br />additional storage of 21,900 acre - feet. <br />9.0 OPINION ON CONSTRUCTION COSTS <br />Construction cost estimates are based on estimated quantities - for major project features and <br />work items. Unit prices for construction items were estimated assuming that conventional <br />construction equipment and practices would be used. Unit prices were refined to reflect local <br />conditions and materials available at the site, or required to be imported. Mobilization, bonds <br />and 'insurance were estimated as 1.5% to 3.0% of the base construction cost. A contingency <br />item at 15% of the base construction cost for unscheduled work items was included in the <br />construction cost estimate, which is a catch ;h�additional ll categor for smaller and other work items not <br />specifically identified in the cost estimates. �1% construction contingency was <br />included to account for unanticipated site conditions, potential change orders, to reflect the <br />construction market at the time of the project bid, and other uncertainties in the cost <br />2 \repo its \97 -1 -500. nk <br />