01-27-2014 Council Packet - Laserfiche WebLink

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13-3637 November 14,2013 Page 5 c. No rare plant communities were found. d. A potential need for proactive management of buckthorn was noted. - The Conservation Design Master Plan contains the following elements: - Stormwater Master Plan - pending final site layout - Invasive Species Removal and Management: - Common Buckthorn to be removed from West and East tree stands - Reed Canarygrass allowed to remain in wetland areas - Diseased trees will be cut down and removed from site; replacements trees to be replanted, including Big Woods types - The northeast tree stand will be protected; any lost trees to be replanted with Big Woods types - Common buckthorn will be removed from northeast tree stand while preserving as many basswood, sugar maple and apple trees as possible - Ecological connections will be maintained via preservation of wetlands and the northeast tree stand. The proposed lot layout would not appear to conflict with the Master Plan, as areas to be protected are not proposed to be developed. Wetlands on Site and/or Impacted The wetlands delineated on the site are designated on City maps as Management Class 2, which under MCWD rules would require a 25' buffer. However, Jacobson has completed a MnRAM assessment that indicates a lower quality classification, and pending confirmation from MCWD the wetland would be reclassified as Management Class 3, requiring a 16' buffer per MCWD rules. The final Management Class needs to be confirmed to meet MCWD requirements prior to final plat approval, but in either case the plat layout indicates a 35' wetland setback for structures, meeting the Orono wetland setback requirements. There are no proposed changes to the wetlands. Per the City Engineer, Drainage and Utility Easements must be placed over the wetland, buffer and all ditching directing runoff, and must be shown on the Final Plat and final Street, Utility and Grading Plans. Existing Draina�e Easement. There is an existing drainage easement within the easterly portion of the property approximately following the creek bed. This was dedicated in the plat of Hunters Green but does not exactly match the current flow line of the creek. This easement is proposed to be vacated, and a corrected easement dedicated to replace it. Stormwater and Drainage Improvements The developer is providing stormwater management facilities on the site consisting of a number of rain garden basins. The City Engineer notes that the drainage calculations meet City requirements such that proposed runoff rates will be less than existing runoff rates, but any plan changes will potentially require plan revisions. A final Stormwater Management Plan will have to be submitted with the Final Construction Plans.