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Table 16: Alternative S8 - Belleau Lake Lowered Cost EstimateFarmer/Prairie CreekAlternative S8 Cost Estimate Aug 04Line Unit TotalItem Item Quantity Unit Price CostCulvert42300200 Concrete Spillway 770 SQ YD $38 $29,26054200439 RCCP Pipe Culvert 24" 170 FT $50 $8,500Storage ExcavationDesign 24" Tide Flex Valves 1 Each $6,500 $6,50020200100 Excavation 993 CY $11 $10,824Contingencies (15%) and Mobilization (6%) <strong>of</strong> subtotal $11,568Construction Cost $66,651Engineering (20%) and Construction Supervision (7.5%) $18,329Right-<strong>of</strong>-Way Cost 719920 SQ FT $0.00* $0Total Project Cost $84,980Alternative Average Annual Cost (5.375% For 50 Years) $4,927O&M (1%) $700Alternative Average Annual Cost and O&M $5,627Baseline Average Annual Damages (Direct and Indirect) $144,531Alternative Average Annual Damages (Direct and Indirect) $127,903Alternative Average Annual Benefits $16,628Benefit Cost Ratio 2.95Frequency 1 2 5 10 25 50 100Existing Damaged Structures 0 1 2 11 38 64 96Alternative Damaged Structures 0 1 1 7 28 64 89Structures Removed from Floodplain 0 0 1 4 10 0 7* $0.00 Assessed value because <strong>of</strong> current public ownership.52
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