Agenda - Council - 07/26/1994 - Laserfiche WebLink

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Another issue of concern on the part of the citizens was the impact of drainage from this roadway on Wetland #111P which is a landlocked water body. The consultants have addressed this concern on page 7 of the report. Based upon their analysis, a 100-year event would have an impact on the high water elevation by 0.03 foot, or approximately 1/3 of an inch. Runoff from this roadway is proposed to be collected in two separate storn~ sewer systems, each one outletting into sedimentation basins located south of 153rd Avenue N.W. These basins would provide treatment to enhance water qualily prior to discharge into the wetland. Concern was also expressed for the protection of the Blandings Turtle, which Wetland gl 14 is acknowledged to be a likely habitat for this State-threatened species. In comments from the DNR concerning protection of the turtle, it was recommended that a chain link fence be installed to prevent turtles from crossing the roadway. It is Staff position that the chain link fence, while being effective in preventing turtles from entering the roadway, would be a high maintenance, poor aesthetic solution. It is proposed that a short retaining wall be constructed along the area where the proposed roadway comes closest to the wetland. Because of the number of comments received concerning the uniqueness and beauty of the wetland, coupled with the fact that parkland has been dedicated along the perimeter of Wetland #I 11P at other locations, the consultant was asked to develop a master plan incorporating a trail system to create a passive recreational focus for the area. A nail master plan is presented in Figure 6 of the report. Plans for the alignment of the roadway are illustrated in the report in Figures 9 through t 1. These figures allow the alignment of the roadway to be reviewed relative to existing roads, tree lines and the wetland. Attention has been given toward preserving existing tree lines which border residential properties to the north. Figure 12 illustrates the land parcels which would be directly involved by property acquisition for the construction of this roadway. Parcel #1, located on the southwest corner of Armstrong Boulevard N.W. and 153rd Avenue N.W., may involve the vacation of a small portion of right-of-way. In any event, the skewing of the road wild provide this property owner with an additional distance from the roadway over what currently exists. Parcel #4 involves the residents west of Armstrong Boulevar~t' N.W. The proposed alignment would place a roadway closer to the existing residence than was previously anticipated prior to skewing the intersection with 153rd Avenue N.W. However, the roadway will meet all current zoning setbacks. Land acquisition will be required from a total of five property owners as properties 5 and 6 are currently in the same ownership. A summary of costs for the construction of this roadway is contained in Table 2 of the report. Previous cost estimate for the project was $491,000. The revised estimate for the roadway and the associated trail is estimated to be $726,000. The increase in costs over the original estimate are due to several factors: the retaining wall to avoid incursion into the wetland added $73,500, the trailway which cost $48,700 was not included in the original estimate, the turtle barrier added $24,750, and storm sewer added $120,000 due to the flat street grades requiring storm sewer down the length of the street. The balance of the cost increase is because the length of the project was increased due to the necessity of skewing the intersection at Armstrong Boulevard N.W. Recommendations: It is Staffs recommendation that City Council select Alternative C as the alignment for the final design of the roadway. It is further recommended that the Council take the next step toward construction of this roadway by authorizing Staff to negotiate with RLK, Inc. for