08-24-2015 Council Packet - Laserfiche WebLink

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The following criteria are being incorporated into the design of the wetland replacement area in order to create natural wetland characteristics and wildlife habitat: • Bottom contours will be varied when practicable to promote growth of different species of vegetation within the wetland. • The wetland will be connected to existing wetlands in order to ensure adequate hydrology in the replacement wetlands and to provide greater public benefit than a small isolated area. The City will purchase wetland credits from an approved wetland bank for the balance of wetland replacement required. The City is proposing to utilize their Woolans wetland bank. Ground Preparation Excavation and grading within the proposed created and restored wetland area will be completed per the attached wetland mitigation design. Once the area is graded to the proposed elevations, it will then be rolled with cheeps -foot roller to create a dense layer within the same elevation to enhance the potential for ponding water giving hydrophytic vegetation a greater chance at taking root. Once the soil has been prepared wetland seed mix 34-262 (Wet Prairie) will be spread within the newly created wetland and restoration area. The area will be kept moist until seeds germinate and are established. If hydrophytic vegetation has not appeared within two months, the area will be re -seeded according to specifications. Created wetland Seed mix 34-262 (Wet Prairie) from the Mn/DOT-BWSR seed mixtures will be applied at a rate of 14.5 Ib/ac. Guidelines for Restoring and Managing Native Wetland Vegetation will be used for proposed wetland areas. The project will create approximately 0.30 acres of Type 2 wetland that will need to be seeded. Seeding will be conducted under favorable weather conditions during either the spring planting season, April 15 to June 30, or dormant planting season, October 15 to frozen soil. Seed tags shall be provided to verify the composition of the seed. Restored Wetland The project consists of restoring approximately 0.67 acres of Type 2 wetland (see attached map for details). The wetland is currently a Type 2 wetland consisting of a reed canary grass monoculture. The reed canary grass is proposed to be removed through a series of burns followed by an application of herbicide to kill of the existing vegetation. The dead vegetation will then be removed and the wetland bottom graded in an undulating manner (refer to Wetland Mitigation design) If burning does not remove the undesired vegetation, the area will be scraped down 8 —10 inches to remove the seed bank followed by an application of herbicide to kill of the growing vegetation. Following the removal of current vegetation seed mix 34-262 (Wet Prairie) from the Mn/DOT-BWSR seed mixtures will be applied at a rate of 14.5 Ib/ac. Guidelines for Restoring and Managing Native Wetland Vegetation will be used for proposed wetland restoration areas. Seeding will be conducted under favorable weather conditions during either the spring planting season, April 15 to June 30, or dormant planting season, October 15 to frozen soil. Seed tags shall be provided to verify the composition of the seed. 2