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C-13 COMMENTARY ON SHEET 5 COST ESTIMATE Portions of Reaches 2 and 3 Reach 3 Station 700+00 to Station 750+00 Station 700+00 to Station 744+00 Reach 2 Sheet 5 shows the remalnlng portion of Reach 2 upstream of M: Intyre Street where lOO-year fl ows spread out to inundate a 1 arge area south of the creek. Overbank flooding depths average around 2 feet and' COllld temperarily disrupt the Coors Industries railroad service 1 ine. The potential impact of this overbank flooding should be evaluated by Coors Industries to determine if preventative measures should be implemented (i.e., raising the south bank of the creek to prevent overflow, etc.) . Station 744+00 to Station 750+00 CONSTRUCTION Remove and Relocate Drop Structure and Lower Channel In Vicinity Of Railroad Bridge Reach 3 begins at McIntyre Street and the 100-year flood flow is confined within the channel banks except for an area just upstream of the Coors Industries railroad bridge, where flows can overtop the north and south banks and affect the Coors Transload operations. Removal of the drop struc- ture just downstream of the rail road bridge and reconstruction of a new drop upstream would lower the channel invert through the bridge and lower the water surface approximately 2 to 3 feet, thus eliminating the overflow. Util ity Relocation Costs TOTAL CONSTRUCTION COSTS ENGINEERING AND CONTINGENCIES (30~ of Construction Costs) FISCAL, LEGAL AND ADMINISTRATIVE (10% of Above Total) Regulation of the existing 100-year floodplain is the recommended strategy for the remainder of Reach 3. PROPERTY ACQUISITION COSTS Maintenance Access to this segment is available by both the Colorado Route 58 frontage road on the north side and by the existing dirt road adjacent to the channel on the south side. TOTAL IMPROVEMENT COSTS (1982) MAINTENANCE Annual Operation/Maintenance Cost $ 50,000.00 I I I I I I I I I I I I I I I I I I I -0- $ 50,000.00 $ 15,000.00 $ 6,500.00 $ -0- $ 71,500.00 $ 18,500.00