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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Boulder and left Hand Repair of Outlet Works <br />CWCBFeasibilityStudy <br />NovemberS, 1999 <br /> <br />Turnaround Alternatives Evaluated <br /> <br />In order to facilitate maintenance and inspection of the spillway, the Ditch Company seeks to construct <br />a widened section of the dam crest near the proposed spillway for a vehicle turnaround, Two designs <br />were evaluated for the construction of the turnaround, reinforced earth, and a concrete cantilever type <br />retaining wall. Due to the potential for settlement in the foundation materials for the concrete <br />retaining wall, the reinforced earth design was considered to be the most feasible, Reinforced earth <br />can be built upon very soft foundations with settlement corrected as the wall is built in sequential <br />horizontal lifts, <br /> <br />The reinforced earth design would be built with compacted one-foot lifts of imported granular, 1,5- <br />inch minus backfill, separated by horizontal layers of geogrid, A shotcrete facing would then be <br />applied with one to two layers of reinforcing wire mesh, Costs were evaluated for the reinforced earth <br />wall and are presented on Table 6, <br /> <br /> Table 6 <br /> Turnaround Construction Cost Estimate <br /> Twin lakes (a,k.a. Davis No.1 Dam) <br /> Unit Costs Item Costs <br />Description Quantity Unit Low High Low High <br /> Estimate Estimate Estimate Estimate <br />Excavation 400 CY $4 $7 $1,600 $2,800 <br />Hauling, Placement and 135 CY $18 $22 $2,430 $2,970 <br />Compaction of Granular <br />Backfill <br />Transport and Installation 3,625 SF $0.75 $1 $2,719 $3,625 <br />of Geosynthetic: Mirafi <br />HS4500 woven polyester <br />Gunnite Facing with 1 LS $5,000 $8,000 $5,000 $8,000 <br />Wire Mesh <br />Reinforcement <br />Class 6 Road Base 8 CY $18 $22 $144 $176 <br />Total Budget Estimate $11,893 $17,571 <br /> <br />The Selected Proiect <br /> <br />The Ditch Company has decided to replace the outlet works and construct a new spillway with a <br />vehicle turnaround area, The desired financing is through a Small Project Loan, A preliminary layout <br />and design is attached in Appendix E, <br /> <br />The Ditch Company will replace the existing 3D-inch diameter, CMP outlet works with a new 3D-inch <br />diameter steel outlet pipe, A new 36-inch diameter drop-inlet spillway will connect to the 3D-inch <br />diameter outlet pipe, The top of the drop-inlet will be set at gage height 9.7, which will provide three <br /> <br />-8- <br />