Agenda - Council - 08/11/1998 - Laserfiche WebLink

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I I I I I I I I I I I I I I I I I I I ,Scope The purpose of this study is to determine the feasibility and costs associated with providing a bituminous surfaced street to serve the segment of Bison Street between 171st Avenue NW and the current southern terminus of Bison Street. This study has been ordered as a result ora citizen petition for said improvement which is attached in Appendix A. Past feasibility studies have been prepared for this improvement in 1993 and in 1990. In those previous studies, discussion of whether Bison Street should be paved as a cul-de-sac, as it now currently exists, or whether it should be extended southward as a through street connecting with Trott Brook Ridge has been controversial. For the purpose of this feasibility study, the street will be proposed to be paved as a cul-de-sac since that is a specific request in the citizen petition. Additionally, the City would need to acquire approximately 350 feet of 66-foot right-of-way in order to extend the street as a through street. Existing Conditions The present street consists of a graded dirt road composed primarily of the sandy native soil material. The road is approximately 24 feet wide, however, near the southern terminus the traveled area widens to approximately 66 feet, the width of the right-of-way. Approximately half of the length of existing roadway appears to be located in the center of the fight-of-way, while approximately 500 feet of road immediately south of 171st is located several feet east of the right-of-way centerline. Drainage along the roadway is poorly developed. In some locations the roadway is elevated above the surrounding grade, while in other areas a berm from successive grading has formed. Proposed Improvements It is proposed to regrade the roadway to the centerline of its intended right-of-way as documented on the County Half Section record maps. It is also proposed that a 24-foot-wide bituminous roadway with two-foot gravel shoulders and minimum two-foot ditches be provided in accordance with the City's minimum paving standard as illustrated in City Plate No. STR-6 located in Appendix B. It is proposed that a 60-foot diameter turn-around be paved at the southern terminus of the currently traveled roadway. The grade of the street will dip from south to north. Other than the two-foot ditch section and the placement of new culverts under driveways, no additional drainage improvements are anticipated. The additional drainage coming off the newly paved surface will not be significantly different than the run-off from the dirt street. However, standing water can be anticipated in ditches and adjacent low lying lands after snow melt events and periods of heavy rainfall. Additional drainage improvements, including acquisition of land for ponding area, would be required for improved drainage beyond that proposed above. The construction improvement would also include turf restoration following road construction. This would consist of fertilizer, seed and mulch placed on the salvaged topsoil available, if any. If additional topsoil is desired, the property owner shall be responsible for obtaining and spreading the material prior to seeding. The roadway right-of-way will be marked prior to