Agenda - Public Works Committee - 09/19/2023

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5. 1. Public Works Committee Meeting Date: 09/19/2023 Primary Strategic Plan Initiative: Not Applicable Title: Review Drainage Concerns at 5725 180th Lane NW Purpose/Background: Purpose: The purpose of this case is review drainage concerns of the property owners at 5725 180th Lane NW. Staff will also present and discuss optional improvements to address their concerns and will seek direction for further action. Background: The property owners at 5725 180th Lane NW, Scott and Lisa Monserud, shared their drainage concerns with City Staff during the design and construction of City Improvement Proi ect # 19-01, Ford Brook Estates Street Reconstructions. In summary, they purchased this property over 25 years ago and have had concerns about stormwater runoff backing up into the property from the drainage ditch located within City right-of-way along 180 Lane. When the street was reconstructed in 2019, minor drainage improvements were completed as part of the project. At the time staff informed the property owners that if they wanted the City to address their drainage concerns in greater detail following completion of the project Staff would explore options and present them to the Public Works Committee for review and consideration of further action. Staff has since identified two primary options. 1. Option 1 - Fill the swale in between the ditch and the shallow pond east of their home that allows water to back up onto their private property. If this option is pursued the fill would have to be designed to allow runoff from the back yard to drain south into the drainage ditch unimpeded. Estimated costs for this option could approach $25,000 depending on the scope of the work. 2. Option 2 - Construct an underground storm sewer system to direct runoff from the ditch to Ford Brook. Estimated costs for this option total $183,000 if completed as a City Improvement project. Below is a cost breakout. Option 2 estimated nroiect costs - 48" Inlet Structure w/HC casting $ 10,000 4 x 48" Storm MH w/casting $ 301000 18" Flared End Section w/ grate $ 3,000 650 LF 18" RCP $ 601000 2 Driveway remove & replace $ 6,000 83 LF Culvert Removal $ 11200 0.25 Acre Seeding $ 11500 155 CY Topsoil $ 81000 Erosion Control $ 11200 Traffic Control (TH 47) $ 51000 Mobilization $ 15,000 Construction Total $1409900 Contingency (10%) $ 141090