Agenda - Council - 02/23/1993 - Laserfiche WebLink

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CASE # 4 GRADING AND PAVING IMPROVEMENT OF BISON STREET N.W. IMPROVEMENT PROJECTS #92-20 AND #92-23 By: Steven J. Jankowski, City Engineer Background: At the last City Council meeting held on February 9, 1993, two public hearings were held on the above projects. Public comments were based upon a description of the project and its method of financing as it outlined in the feasibility study. As a result of the comments made at the public hearing, the City Council accepted the feasibility study for the northern project #92-20 as presented, but directed changes in the scope of project #92-23 such that the south end of Bison Street N.W. would terminate in a cul-de-sac and that 171st Avenue N.W. be removed as a link with the Golden Eagle Estates subdivision to the east. I have revised the portions of the feasibility study accordingly and have mailed it to known interested parties. A revised copy of the feasibility study is attached to this case. Prior to this meeting, a public hearing on Improvement Project g92-23 will be continued. Following the comments, the Council shall again direct any changes it feels necessaD, in the content of the feasibility study as this will be the basis for constructing project improvements and allocating final costs. In making a final determination on the Iraffic pattern configuration, I would like to the Council to consider several points. First, I would point out the rationale for limiting the length of cul-de-sacs stems from concern with problems associated with single access roadways. As the number of persons exclusively served by a given roadway increases, the potential hazard of temporary roadway blockages also increases. Blockages can result from numerous causes such as vehicular accidents, utility breaks, a falling tree or pole, and pavement repairs. While such occurrences are exceptional, they still must be regarded in terms of their effect on access by emergency police, fire or ambulance equipment. For your consideration, the following is a comparison of single point: Alternative Single Access Residences Through Sueet 0 Cul-de-sac; 171st Ay. N.W. Open 11 Cul-de-sac; 171st Ay. N.W. Closed 25 In cases such as this where a particularly long cul-de-sac is created, additional travel distance caused by the cul-de-sac can be significant. Some residents will need to travel an additional mile for each trip to the south. Assuming the average of the 25 single access residences will travel only a half mile additional per trip and only half the trips will occur to the south, over 22,000 extra miles can be expected to be driven collectively each year based upon the standard trip generation rate of 10 trips per unit. Council Action: Motion to accept revised feasibility study on direct modifications. Reviewed by: Copies also distributed to: City Engineer City Administrator Finance Officer CC: 02/23/93