Agenda - Public Works Committee - 07/16/2002

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P.W. CASE # Update to Developments on NW corner of TH47 and Alpine Drive By: Brian Olson, Principal City Engineer Background: The purpose of this case is to give you an update on the implementation of the projects on the Northwest corner of Trunk Highway 47 and Alpine Drive NW and to receive some direction on how to proceed. On May 28, 2002, the City Council granted preliminary plat approval with the contingency that an overflow pipe for storm sewer purposes be constructed down 155th Lane NW to provide for a positive outlet to the Rum River. This requirement complies with the Comprehensive Storm Water Plan that was prepared for the Southeastern part of the City. On July 11, 2002, Staff received a request to hold an informational meeting with the residents along 155~h Lane to discuss the construction necessary to provide for this positive outlet. See attached map to see the area being discussed. Construction of this pipe has been proposed by the developer via two methods - boring and opencut trench. Tree loss and protection of the wetland system in the area was the main topic of discussion and concern. It is Staff's opinion that the boring technique for this project would be not only difficult due the flatness of the pipe but extremely expensive and therefore not feasible. Another topic of discussion that arose after talking with the residents was the restoration and inconvenience that they would experience as a result of this project. Since practically the entire road would be disturbed due the 18 foot depth of the storm sewer pipe in some areas, the question arose regarding the installation of sanitary sewer and water pipes before the restoration was completed. This leads to two complications: the timing of the construction and the responsibility of cost to extend sewer and water to the neighborhood. The construction timeline for the Developments to occur is this fall in August or September. This timing works well for the development as any damage to trees can be minimized during these months as Staff's experience with root and limb damage indicates that oak trees are less susceptible to damage during these months, if handled properly. The subject of cost responsibility was a major concern for the residents along this stretch of roadway. As mentioned in the previous case dealing with the feasibility studies for the area south of City Hall, the idea of the City taking on the cost of the initial installation was mentioned, but not promised, as a possible solution. The residents along this stretch of roadway would have the sewer and water installed at the City's expense and then reimburse the City when they decide with trunk and lateral fees due at the time they hookup to the respective systems. Action: Based upon discussion Reviewed by: Director of Public Works Finance Officer PW: 07/16/02