Agenda - Public Works Committee - 11/19/2002

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P.W. CASE: UPDATE TO THE 155TM LANE NW STORM SEWER PROJECT By: Brian E. Olson, Principal City Engineer Background: As part of the construction of the 4 developments located on the northwest quadrant of Trunk Highway 47 and Alpine Drive, dewatering was necessary to install some deep utilities2 The Contractor for Wildlife Sanctuary, S.J. Louis, Inc., applied and received a DNR appropriations permit for those dewatering activities. Since the dewatering began, we have ran into some issues with the water that is being pumped into the wetland east of Highway 47. There has been numerous discussions with the residents that live around the DNR wetland located ~east of Hwy 47 and north of Alpine Drive NW. The residents are generally concerned with the level that the water reaches before entering into the culvert that was installed on the west side of 155th Lane NW. Attached is a map showing how the water flows before reaching the Rum River. The purpose of the case is to discuss the project and discuss the .possibility of purchasing the easemer~ts necessary to achieve the level necessary during a 100-year rainfall event. Hakanson Anderson Associates provided a model of the storm sewer and updated the Southeastern Stormwater Plan as part of the design work for those developments. The 100 year design elevation is expected to reach an elevation of 864. This. elevation is depicted in the attached resolution and will be explained at the meeting on Tuesday night. There is iapproximately S.F. (to be estimatedby Tuesday night) of land located inside and outside of the wetland limits. At $0.10 per square foot of land this could amount to $ Committee Action: Motion to recommend to the City Council to hire Hakanson Anderson for a not to exceed amount of $1,000 to survey the 864 contour and provide legal descriptions of easements necessary to achieve the 100 year rainfall event. Reviewed by: Public Worka Director/Fire Chief City Administrator PW: 11/19/02 P. 23