Duluth UDC § 712.03

a. The tree survey as required in this Article shall be in the form of a to-scale map or a site plan prepared and sealed by a registered surveyor or certified engineer, arborist or landscape architect, noting the location of all trees (as described in Paragraph (b) below) within the area to be modified from its natural state and 25 feet beyond in each direction or to the property line, whichever is less. b. All specimen trees and all trees that are to be counted toward meeting canopy coverage requirements must be shown on the survey and inventoried by size (caliper or DBH, whichever is applicable) and species. 196 | P a g e Article Seven. Landscaping, Buffers, and Tree Protection c. Sampling methods may be used to determine tree canopy coverage for forested (over 5 acres). Specimen trees must be shown on the plan with an indication whether they are to be retained or removed. All tree protection zones and tree save areas must be delineated on the plan. All buffers with existing trees must be delineated on plans as tree save areas. Land disturbance within any buffer is subject to Planning and Development Department approval.