Agenda - Public Works Committee - 08/18/2020

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Public Works Committee 5. 1. Meeting Date: 08/18/2020 By: Bruce Westby, Engineering/Public Works Title: Consider Recommendation to City Council Authorizing Requests for Quotes for 16660 Jasper Street Drainage Improvements, Improvement Project 19-13 Purpose/Background: Purpose: The purpose of this case is to consider a recommendation to City Council 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. 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 but was never graded. Staff has been working with Capstone Homes and the property owner at 16660 Jasper Street to resolve this issue for many, many years. In 2018, Capstone Homes informed City Staff that they did not think it was reasonable to ask Capstone to be responsible for this issue based on the length of time that had passed and that the as -built was apparently approved. Since then, City Staff developed the attached plan to resolve this drainage issue, which the property owner has reviewed and approved. In summary, 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 installed using a directional drill. The 4" HDPE pipe will connect 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. These drainage improvements will provide positive drainage for the low-lying area on 16660 Jasper Street, and will prevent runoff from ponding in the low-lying area and killing the native plants that were 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. Perpetual temporary easements will also not be needed since the property owner will be responsible for maintaining the new drainage improvements in perpetuity. This project is proposed to be completed this fall. Based on the current bid environment Staff anticipates receiving good quotes.