119-111 - Tier I tree preservation requirements LAST AMENDED 12/7/1999 To the maximum extent possible, existing trees shall be retained. Trees of six-inch #caliper# or more may only be removed or destroyed as a result of a #development#, #enlargement# or #site alteration#, provided that: (a) such trees are located in areas to be occupied by #buildings#, #private roads#, driveways, areas for required #accessory# parking, or within a distance of 15 feet of the exterior walls of such #building#, provided that it is not possible to avoid such removal by adjustments in the arrangement of such #buildings#, driveways or required parking areas; (b) the continued presence of such tree would create special hazards or dangers to persons or property, which would not be possible or practical to eliminate by pruning; (c) the continued presence of such tree would interfere with the growth or health of another tree of six-inch #caliper# or more designated for preservation and belonging to a species listed in Appendix B (Selection List for On-site Trees); or (d) an authorization pursuant to Section 119-313 (Modification of landscaping, tree preservation and tree planting requirements) has been granted by the City Planning Commission approving the removal of such trees. Any tree of six-inch #caliper# or more that cannot be preserved as a result of a proposed #development#, #enlargement# or #site alteration# shall be replaced pursuant to the provisions of Section 119-112 (Tier I tree planting requirements).