Admin Order 58-01-11-F (2) - Laserfiche WebLink

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Another basic assumption of the transportation SDC is that the rates assigned to each use classification include all related functions for that type of development. Where the development includes mixed land uses which are independent activities, as distinguished from ancillary or supporting uses, a composite development charge will be calculated for each use. 1.3 Arterial and Collector Street Cost Analysis The cost figure for street construction is 'a key factor in the equation by which the transportation portion of systems development charge is calculated. This discussion outlines the methodology and assumptions- used to calculate a unit cost used in the systems development charge equation. The cost of a lane mile of arterial or collector street is derived from several components: • the basic construction cost of a linear section street • the cost of intersections • the cost°of bridges or other structures • the cost `of traffic signals, and • the cost of street lights Figure 2 illustrates the method for calculating the arterial and collector street components of the transportation SDC. 1.3.1 Linear Section Construction Costs The two typical sections developed for this analysis are based upon standard engineering practices, City policy, and policies included in the most recent Council- adopted, long-range transportation plan for the Eugene-Springfield area. The supporting data and detailed analysis for typical arterial and collector sections used in this methodology can be found in Table 3 of this Appendix. The supporting data includes estimated construction costs per lineal foot and linear mile for typical arterial and collectors including engineering and administrative costs, the average number of lanes per mile of arterial and collector section, and the average assessable and non- assessable cost per linear foot, per linear mile, and per lane mile. 1.3.2 Intersection Construction Costs The importance of intersections as a component in the arterial and collector street cost calculation comes from costs which are higher than a linear section of street and from the City's long standing policy not to assess costs for intersections to adjacent property. The cost calculations for typical street intersections were based on the lineal foot unit for different street widths and typical right-of-way widths for local and collector/arterial streets. Based on the average number of intersections per mile, the intersection cost per lane mile ofarterial/collector streets including administration and engineering costs can be estimated. Note that the average number of intersections does not include the downtown grid. It was judged unlikely that the dense grid system of streets in downtown Eugene would be repeated elsewhere and thus avoids the potential for overestimating the number of intersections per mile. City of Eugene SDC Methodology Transportation, Page B- 3