Agenda - Public Works Committee - 07/18/2023

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5. 2. Public Works Committee Meeting Date: Primary Strategic Plan Initiative: 07/18/2023 Not Applicable Title: Review Drainage Concerns at 5725 180th Lane NW Purpose/Background: In 2019, the City reconstructed 180th Lane NW as part of the Ford Brook Estates Street Reconstruction project. During that project, the property owners at 5725 180th Lane NW voiced concerns that stormwater runoff comes close to the east side of their home. This property has a small depression and swale on the east side that overflows into the drainage ditch along 180th Lane. The purpose of street reconstruction projects is to repair pavement sections. If drainage issues are discovered during these projects, staff notes such issues and repairs them if possible. Otherwise, staff documents such issues and tries to assist property owners to resolve the issues at a later date. During the project close out process our contractor removed several feet of silty soils under about 40 feet of the east end of the ditch in front of this property and replaced it with clean sand so the ditch would drain faster after rain events. At that time Staff informed the property owners that if they felt additional drainage improvements were needed staff would assist them in exploring the scope and cost of such improvements, and that if the property owners felt the City should construct the drainage improvements staff could assist in presenting a request to the Public Works Committee. Following completion of the Ford Brook Estates Street Reconstruction project in 2020, City staff began work to develop a concept plan and associated project cost estimate for a drainage improvement project to help prevent stormwater runoff from backing up through the swale and depression into the front yard at 5725 180th Lane NW from the ditch along 180th Lane NW. The concept plan developed by staff proposes to install 18" storm sewer to convey stormwater runoff from the ditch along 180th Lane at the east side of the property through 18" storm sewer installed under the north side of 180th Lane and the west side of Highway 47 where it would outlet to Ford Brook. The proposed improvements include approximately 650 linear feet of 18" storm sewer, 5 manholes, repairing 2 driveways, erosion control measures, topsoil, seeding, traffic control and permitting (MnDOT Right -of -Way, LRRWMO). Attached is a concept plan showing the proposed storm sewer alignment with 5 manholes. The estimated project cost is $150,000. Staff will provide additional information, pictures and video clips during their presentation. Notification: The property owners will receive a link to this case, and will be invited to attend the Public Works Committee meeting on Tuesday evening. Time Frame/Observations/Alternatives: Staff anticipates 20 minutes will be required to present this case and respond to questions. Funding Source: Dependent on discussions and direction from the Public Works Committee.