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City of Orono <br />Surface Water Management Plan February 2019 43 <br />5.5 Wetland Restorations <br />5.5.1 Proposed Wetland Restoration Sites <br />Restoration projects will be coordinated with and TMDL reduction managed through <br />the City’s SWPPP. The following are wetland restoration projects identified to help <br />manage stormwater runoff and improve water quality. <br />W-1. Wetland Restoration Opportunities <br />Collaborate with MCWD and private landowners to restore degraded or drained <br />wetland areas as opportunities arise. Wetland areas will be evaluated on an individual <br />basis for water quality treatment benefits, additional storage capacity, and educational <br />and recreational value.In general, Orono will consider conservation, preservation, and <br />wetland restoration when development proposals are submitted. More specifically, <br />Orono will implement its buffer requirements per City code, and when development is <br />proposed in key conservation areas, the City will promote low impact development <br />techniques. These projects will help meet the goal of improving the quality and <br />quantity of wetlands in Orono, increase flood storage, and improve the quality of runoff <br />to Lake Minnetonka. <br />Prioritization:Medium <br />Estimated Cost: Unknown <br />Project Partner(s): MCWD, Private Landowners <br />Funding Source(s): City, MCWD, Grant funding <br />Timeframe: Unknown <br />Should any additional wetland restoration sites be identified in the future, this plan <br />should be updated to include proposed sites. <br />5.6 Natural Area Preservation and Restoration <br />5.6.1 Proposed Natural Area Preservation and Restoration Sites <br />The City will be available to work with MCWD and private landowners to investigate <br />potential natural area preservation and restoration sites. The City will also require <br />preserving natural upland areas and creating natural upland corridors during <br />development planning per the requirements listed in the City code. Preservation and <br />restoration projects will be coordinated with and TMDL reduction managed through <br />the City’s SWPPP. The following are localized stormwater treatment improvement <br />projects identified to help manage stormwater runoff and improve water quality. <br />N-1. North Arm Drive Ravine Stabilization <br />Collaborate with MCWD to stabilize an existing ravine (approximately 100’) in the <br />neighborhood of 650 North Arm Drive that has eroded to a depth of several feet. Due <br />to excessive sediment and organic material loads from erosion, Stubbs Bay of Lake <br />Minnetonka is being prematurely filled in and additional load is being transported <br />downstream. This contributes to increased sediment and phosphorus loads and reduced <br />dissolved oxygen in runoff, and is extremely detrimental to water quality. In order to <br />reduce detrimental impacts on downstream systems, this ravine needs to be stabilized. <br />To repair the ravine, the City will design a stable cross-section, install limestone grade <br />control weirs with plunge pools, and plant deep rooting native vegetation. Placement of <br />boulder toe protection will stabilize side slopes and reduce erosion, installation of