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An existing healthy deciduous hardwood tree measuring a minimum of six inches in diameter <br /> (DBH). an existing healthy common tree measuring a minimum of 12 inches in diameter (DBH), or an <br /> existing healthy coniferous/evergreen tree measuring a minimum of 12 feet in height (every three feet <br /> in height of a coniferous/evergreen tree is equivalent to one inch of diameter (DBH)). <br /> Tree Certification <br /> A certified inventory of trees on the site after work is complete listing all trees and their final <br /> disposition, which is signed by a licensed forester or landscape architect. <br /> Tree Preservation Plan <br /> A plan and inventory certified by a forester or landscape architect indicating all of the significant <br /> trees and their locations in the proposed development or on the lot. The Tree Preservation Plan shall <br /> include the size, species, tag numbers, and location of all significant trees proposed to be saved and <br /> removed on the area of development, and the measures proposed to protect the significant trees to be <br /> saved. <br /> Tree Protection <br /> Snow fencing or polyethylene laminar safety netting placed at the drip line of the significant trees <br /> to be preserved. The tree protection measures shall be shown on tree preservation plan drawings and <br /> remain in place until all grading and construction activity is terminated. <br /> Subd. 3 Removal Threshold <br /> (1) Development in residential districts may remove or disturb up to 40% of the total inches of <br /> significant trees DBH. Any removal or disturbance beyond this threshold shall require restoration. <br /> Significant trees removed for water quality treatment ponds, public trails, sidewalks and collector or <br /> arterial roads, or trees considered invasive species, are exempt from the removal threshold calculation <br /> (minor roads or local development roads are not exempt). <br /> a. The following calculation procedure must be used to determine tree replacement <br /> requirements: <br /> 1. Calculate 40% of the total diameter inches (DBH) of significant trees on the site. This is <br /> the allowable tree removal limit, or the number of inches that can be removed without replacement. <br /> 2. Subtract the total diameter inches of common trees (which are significant) that will be <br /> removed from the allowable <br /> 3. If any allowable inches remain, subtract the total diameter inches (converted to DBH) of <br /> coniferous/evergreen trees (which are significant) that will be removed from the remaining allowable <br /> inches. <br /> 4. If any allowable inches remain, subtract the total diameter inches (DBH) of hardwood <br /> deciduous trees (which are significant) that will be removed from the remaining allowable inches. <br /> (2) Development in non-residential districts may remove up to 60% of the total inches of <br /> significant trees DBH. Any removal or disturbance beyond shall require reforestation. Significant trees <br /> removed for water quality treatment ponds, public trails, sidewalks and collector or arterial roads are <br /> exempt from the removal threshold calculation. <br /> a. The following calculation procedure must be used to determine tree replacement <br /> requirements: <br /> 1. Calculate 60% of the total diameter inches (DBH) of significant trees on the site. This is <br /> the allowable tree removal limit, or the number of inches that can be removed without replacement. <br />