Agenda - Council - 08/25/2020 - Laserfiche WebLink

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CC Regular Session 5. 10. Meeting Date: 08/25/2020 By: Bruce Westby, Engineering/Public Works Information Title Adopt Resolution #20-175 Approving Plans and Authorizing Requests for Quotes for 16660 Jasper Street Drainage Improvements, Improvement Project #19-13 Purpose/Background: Purpose: The purpose of this case is to adopt Resolution #20-175 approving plans and authorizing Requests for Quotes for 16660 Jasper Street Drainage Improvements, Improvement Project #19-13. Background: The property owner at 16660 Jasper Street first contacted Staff regarding general drainage concerns when the Brookfield residential development planning process began. The property owner was generally concerned that stormwater runoff would no longer be able to freely drain from the northwest corner of his property to the west as it had always done. At the time, the property owner was assured that the new development could and would not negatively impact drainage from his property. Attached are aerial images showing elevation contours at 2-foot intervals which show that stormwater generally drains from east to west across this property (right to left, north is up). When Brookfield 2nd Addition was constructed, the property owner informed Staff that when grading was completed for the new home at 16725 Limonite Street NW, stormwater runoff was blocked from freely draining from the northwest corner of his lot. Attached are the As -built Certificate and Modified Certificate of Survey for 16725 Limonite Street NW (Lot 1, Block 5 Brookfield 2nd Addition), as well as contours for this and surrounding properties both pre and post development. Based on the modified Certificate of Survey, drainage of the low point was proposed to be accommodated across the rear of Lot 1, Block 5 by grading a drainage swale with a 2% longitudinal slope, which was staked for construction on November 19, 2007, as called out in note 8. However, this drainage swale was never graded. Staff has since tried to work with Capstone Homes and the property owner of 16660 Jasper Street to resolve this issue. However, in 2018 Capstone Homes informed City Staff that they did not think it was reasonable for them to be held responsible based on the length of time that had passed, and based on their observation that the as -built survey was apparently approved. City Staff then developed the attached plan to resolve this issue, with input and approval from the property owner. A summary of the design is that a small plastic catch basin with a metal "beehive" grate on top is proposed to be constructed in the low point in the northwest corner of 16660 Jasper Street. This will drain into a 4-inch high -density polyethylene (HDPE) pipe that will be directional drilled and connected to a new manhole constructed over the end of an existing storm sewer stub that was constructed between the properties at 16725 Limonite Street NW and 7078 167th Avenue NW. This will provide positive drainage for the low-lying area on 16660 Jasper Street to prevent runoff from ponding in low area and killing the native vegetation that was specially planted by the property owner. All work is proposed to be completed within existing drainage easements on the Brookfield properties, and within a temporary construction easement along the NW corner of 16660 Jasper Street, which the property owner has agreed to provide at no cost to the City. The City will not need to acquire any permanent easements to complete this work