C150273 Feasibility Study - Laserfiche WebLink

Home Browse Search

the new reservoir will be set at 3H:1 V for the upstream and downstream slopes. A geotechnical investigation of the reservoir site found the site soils to be granular and fairly permeable; due to the granular nature of the soils the reservoir will require an impermeable liner. For alternative 4 the reservoir liner was assumed to be an HDPE liner, the HDPE liner has the benefit of being both resistant to UV desiccation and suitable for protection against wind/wave erosion. One negative to the HDPE liner is that the liner can be damaged if gas pressures build up below the liner and cause the liner to deform. The estimated total project cost for this alternative is $ 837,000 as show in Table 8. A complete breakdown of the work proposed and expected costs are included in Table 8. 8.4.5 Reservoir Alternative Cost Estimates The complete breakdown of the cost of the work proposed for Reservoir Alternative 1, Reservoir Alternative 2, Reservoir Alternative 3, and Reservoir Alternative 4 are shown in Tables 5, 6, 7, and 8 respectively. The costs are based on our past experience with similar projects and also from data supplied by local contractors and suppliers. Quantities were based on surveying and a topographic map of the dam outlet area that was recently conducted for this project. A summary of the costs for the four alternatives, including the engineering fees and contingencies, are shown in Table 9. TABLE 9 COST PROJECITON SUMMARY FOR RESERVOIR ALTERNATIVES ITEM Reservoir- Alternative 1 Reservoir Alternative 2 Reservoir ' Alternative 3 Reservoir Alternative 4 1. Construction Cost $ 325,000 $ 658,000 $ 384,000 $ 618,000 2. Contingency @ 20% $ 65,000 $ 132,000 $ 77,000 $ 124,000 3. Engineering Fees $ 70,000 $ 95,000 $ 75,000 $ 95,000 4. Total Project Cost $460,000 $ 885,000 $ 536,000 $ 837,000 5. Cost Per Acre Foot $ 9,200 $ 17,700 $ 10,720 $ 8,370 Feasibility Study of the Ogilvy Augmentation Company Page 14 Well Augmentation Project