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}> Street Light Costs }> Bridge and Other Structure Construction Costs Cost basis assumptions and related factors are listed in Table 4. Specific system valuation calculations for these cost components are reflected in Table 5. Because new development trips will be served by a combination of existing and new facilities, and because the costs of new and existing facilities vary according to prevailing design standards and policies, the average cost per lane mile is calculated based on a weighted average of existing and projected new lane mile costs. The weighting between the existing system average cost and the new system cost is based on new development's projected utilization of existing system capacity versus new capacity-oriented improvements. This weighted average cost basis approach also supports the development of separate Reimbursement and Improvement SDCs. Oregon SDC law allows local governments to charge an improvement SDC, a reimbursement SDC, or a combination of the two. The Improvement fee is intended to recover the costs of future capacity improvements needed to serve new development, while the Reimbursement fee relates to the costs of existing facilities that provide capacity for growth. In determining the appropriate weighting of the existing system and future system costs to be used in the development of the cost basis, projected vehicle trips generated by growth were modeled and separated into 2 categories: Trips that conduct their travel entirely on the existina Eugene arterial and collector network (existing system); and Trips that rely on projected SDC-funded future improvement during their travel on the Eugene arterial and collector network (future system). Modeling and analysis of the future trips using this approach results in a split of 40 percent existing system trips and 60 percent future system trips. These percentages are applied to the average costs per lane mile of the existing and future systems respectively to determine the weighted average cost per lane mile of the street system (see Table 5). The formula for developing the street component cost basis is as follows: SDC Cost Basis = Avg. Cost Per Lane Mile (existing system) X Capacity % (existing system) + Avg. Cost per Lane Mile (future system) X Capacity % (future system) Table 5 details the calculation of the average cost per lane mile by component for the existing and future systems. The development of separate costs for existing and new capacity allows for changes in building standards, system configuration, assessable construction costs, and other assumptions between City of Eugene sDC Methodology Transportation, Page B- 2