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I I I I I I I I I I I I I I I I I I I planned as part of the proposed re-routing of the State highway. In regard to the other improvement on Cressmans Gulch, it is recommended that channeliza- tion take place in conjunction with the planned development and that costs of construction be incurred by the developer. costs, engineering, legal, and administrative costs, right-of-way acquisition costs, and annual operation and maintenance costs. These estimates are broken down on a sheet-by-sheet basis and also according to jurisdiction. A 30% factor was added to the total est imated construct i on cost to account for fiscal, legal and administrative fees, engineering, surveying, construction inspect i on, and construct i on cont i ngenc i es. The itemi zed improvement costs and totals for each jurisdiction are summarized in Tables 11-1 and 11-2 (Section II). These cost estimates are further separated for each master plan drawing and arp included in tables following each sheet commentary (Section IX). Tables VI-3 and VI-4 summarize the benefit/cost data for the recommended plan using cost data from this study and damage reduction information from Phase A. The implementation priorities are recommended realizing that Kenneys Run appears to constitute the major flood threat to the City of Golden and can be expected to worsen as development cont i nues withi n the bas in. A 1 so, the benefit/cost analysis presented in the Phase A Report showed positive benefits for implementing the Kenneys Run master plan. The past flood history of Tucker Gulch also suggests that improvements are needed, but economics of implementing major improvements is not as supportive. Therefore, Tucker Gulch improvements are considered secondary to Kenneys Run at thi s time. In gene- ral, improvements to major drainageways should be prioritized to complete the downstream facilities first and proceed in an upstream manner. Detention facilities are the excetion to this rule, since downstream benefits can be realized immediately upon completion of upstream detention facilities. Cost Estimates For the proposed master plan presented in this report, the costs for construc- t i ng the respect i ve facil it i es and acqui ri ng needed ri ght-of-way have been estimated using current real estate values, material prices, and labor rates. The unit prices used for preparing the constructon cost estimate are listed in Table VI-2. Also included in the cost for the proposed plan is the estimated annua 1 ope rat i on and mai ntenance expenditures assoc i ated wi th each type of flood control facility, Table VI-I. The cost estimate for each improvement was itemized gories: channel improvements, street crossing relocation costs, storm sewer improvements, detention by the foll owi ng cate- improvements, utility facilities, contingency VI-7