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COMMENTARY - SHEET 5 OF 12 COST ESTIMATE - SHEET 5 OF 12 The major recommended improvement shown on Sheet 5 of 12 is the 100-year channel improvement of Tucker Gulch from the State Highway #58 overpass to the confl uence with Clear Creek. In confining 100-year flows to the channel, replacement of the 9th Street bridge and lowering of the channel invert below 10th Street will be required. A total of eleven drop structures are planned, including the drop and concrete cap recommended for protection of the Church Ditch siphon cross i ng. At the confl uence wi th Cl ear Creek, 1 and acqui sit i on is recommended to provide a stilling area and debris basin. ITEM Channel Improvements Street Crossings Utility Relocation Subtota 1 Contingencies (15%) Engineering, Legal & Administrative (15%) Mai ntenance access along the improved channel is shown. Access into the channel wi 11 be provi ded downstream of the 7th Pl ace bri dge and from the stilling area and debris basin at the confluence with Clear Creek. It is intended that existing streets be utilized for access as much as possible. TOTAL CONSTRUCTION COST Right-of-Way Acquisition A possible alternative channel alignment could be dictated by the widening of Ford Street along the Coors Porcelain Company. The City may wish to consider this alternative prior to proceeding with the final channel design. TOTAL CAPITOL COST OF IMPROVEMENTS TOTALS IN EACH JURISDICTION Other recommendations less apparent on this plan sheet include: maintenance access to the existing rock-lined channel upstream of 7th Place, and floodplain regulation of the Kenneys Run floodplain. Participation in the Nat i ona 1 Flood Insurance Program shoul d be continued, and pri vate property owners should be encouraged to purchase flood insurance. Considering the past flood history of Tucker Gulch, property owners along this stream should also be encouraged to purchase flood insurance. City of Golden Jefferson County Annual Operation and Maintenance Costs Regarding the cost figures which follow, all costs are associated with the Tucker Gulch improvements, with the exception of a $500 annual O&M cost pertaining to the Kenneys Run storm sewer on the Coors property. COST I I I I I I I I I I I I I I I I I I I $817,000 94,500 4,800 916,300 137,445 137,445 1,191,190 691,250 1,882,440 1,882,440 -0- (7,200)