10/30/2013 Env Bd Packet - Laserfiche WebLink

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Tree Preservation and New Tree Requirements The following Table "Tree Preservation and Mitigation Standards" is from the updated zoning ordinance. Tree removals are mitigated at rates provided for in the table. Tree Preservation and Mitigation Standards Environmentally Sensitive Area (ESA } Category Tree Location: within Basic Use Area Tree Location: within Basic Use Area deciduous trees 6" dbh and over or evergreen trees between 12' -20' tall deciduous trees 6 -12" dbh or evergreen trees between 12' -20' tall deciduous trees over 12" dbh or evergreen trees over 20' tall Non -ESA no mitigation required provide one tree per tree removed provide two trees per tree removed Natural Resource Conservation Area or Natural Resource Corridor Enhancement Area provide one tree per four trees removed provide two trees per tree removed provide three trees per tree removed Natural Resource Protected Area provide one tree per two trees removed provide two trees per tree removed provide three trees per tree removed The Basic Use Area is defined as the area dedicated to site's use, including buildings, parking, loading, driveways, streets, outbuildings, trash enclosures utilities, landscaping and grading necessary for the construction of the above uses. Grading activities and road construction will encroach on both conservation areas and protected areas and will require mitigation in accordance with the standards. However, staff is proposing to allow for removal of green ash (due to the emerald ash borer) without mitigation. Additionally, as a part of our adaptive management techniques, Aspen trees removed within Environmentally Sensitive Areas (ESA's) will not require replacement provided that all top soils removed from the buffer areas are returned to the same site as much as possible after grading is done Surface Water Management The plat area lies within the Reshanau Lake Management Area. Reshanau Lake is impaired for nutrient loading. Before construction on this site, there are an estimated 39.30 acres of pervious land and 0.50 acres of impervious land. After construction there will be an estimated 32.10 acres of pervious land and 7.70 acres of impervious land. Rule C of the Rice Creek Watershed District Rules, went into effect on July 1, 2013. The rule sets standards to: 4 • • •