PROJ00454 - Laserfiche WebLink

Home Browse Search

I I I I I I I I I I I I I I I I I I I Feasibility Report for Dam Safety Modifications to DeWeese Dam April 22, 1997 17 Equally important as the economic consequences of this alternative are the consequences relative to the potential for failure of the existing crest section, Our structural analyses indicate that the existing crest section is likely to fail under loading conditions less than the y" Pl'vIF runoff event. Such a failure would be expected to result in an increased threat to lives and property downstream from the dam, and presents a significant potential liability to the Company. 3.6 ESTIMATED PROJECT COSTS Total project costs have been estimated for both of the rehabilitation alternatives presented in this report. Because the no-action alternative (Alternative No.3) does not involve physical modification of the dam structure, we have not estimated any costs associated with its implementation, except as discussed in Section 3,5. The project costs include estimates for final design engineering, project construction, and construction administration, Final design engineering and construction administration costs have been estimated for this study as percentages of the estimated project construction cost. The percentages used are based on our evaluation of the size and complexity of the project, and a correlation with experience on similar projects, As project development continues, refinements and adjustments can be made to these estimates as appropriate, The three project cost components are discussed in the following paragraphs. The estimated project costs for Alternative No, I and Alternative No, 2 are presented in Tables 6 and 7, respectively, The estimated costs given in these tables are for January 1997 price levels (ENR Construction Cost Index = 5730.36), Adjustments for anticipated future construction dates are made in the Financial Evaluation section of the report (Section 6), Final Design Engineering: This cost allowance includes engineering services for project design, permitting, and related activities, For this level of study, these costs are typically estimated as a percentage of the estimated cost to construct the work, Final design engineering is expected to include final design of the selected alternative; preparation of construction drawings, specifications and related bid documents; construction permitting activities; and assistance to the Company during construction contract bidding and contract award, The scope of appropriate final design engineering services could change as project development progresses, For this report we have estimated final design engineering costs to be 7 percent of the estimated cost to construct the project. Construction: Project construction costs were developed from estimates of the quantities of work anticipated for the identified items of work, based on the design concepts presented in this report, Unit prices were based on published cost data (local and national), quotations from material suppliers and contractors, and bid prices for similar construction work, Where 96006\REPORTS\FEAS\TEXT.NEW ~ GEl Consultants, Inc,