Agenda - Public Works Committee - 07/19/2022

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Approximately 20 minutes for presentation and discussion. Observations/Alternatives: Staff believes that the water observed in the bottom of the trench in recent years is most likely not from storm water runoff but rather groundwater rising in conjunction with the lake level rising. Permits from both the DNR and the Lower Rum River Watershed Management Organization would be required to complete the requested improvements as the settling basin and overflow would be located within wetland 114P (see attached Figure 3) which requires a WMO permit, and the work would be occurring below the Ordinary High Water Level which requires a permit from the DNR. In addition, wetland mitigation credits would need to be purchased at a 2:1 ratio to replace the impacted wetland due to construction of the settling basin. Staff estimates that construction of the proposed settling basin and restoration of the swale would cost between $15,000 to $45,000, depending on the volume of stormwater to be treated, required dewatering, the cost of wetland mitigation credits, and the method of turf restoration to be used for the swale. At this time, the property owner is not requesting to fill the swale or vacate the easement so these costs have not been considered. Funding Source: Funding for the City's share of any ordered improvements would be taken from the Stormwater Fund. Recommendation: Staff recommends that the property owner be required to pay for the requested work since it benefits the use of his property. However, the City could consider contributing an amount commensurate with the estimated long-term savings associated with maintaining a settling basin next to a public street versus maintaining a linear drainage swale along the rear of the private property. Based on a 50 year maintenance schedule this cost would be approximately $500 assuming the City would dredge and restore the turf in the swale twice, once every 25 years. Action: Staff is requesting Committee direction on whether this request should be considered for approval, and if so, whether the City should contribute anything towards the project. If the Committee is in agreement with the request, Staff would request that the Committee provide a formal recommendation for the City Council since this item would require Council approval as it is not a budgeted work task. Figure 1 Figure 2 Sunwood Dr Plan DNR EAW Rvw Ltr Certificate of Survey Figure 3 Attachments Form Review Inbox Reviewed By Date Grant Riemer Grant Riemer 09/10/2015 12 : 51 PM Kurt Ulrich Kathy Schmitz 09/10/2015 04:12 PM Kurt Ulrich Kurt Ulrich 09/10/2015 04:28 PM Form Started By: Bruce Westby Started On: 09/09/2015 09:39 AM Final Approval Date: 09/10/2015