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Y • That the removal of a heritage oak tree must be in the public interest; that the tree interferes with an existing structure, utility service, or road, and no reasonable alternative exists to correct the interference other than removal of the tree; that removal is necessitated because the tree is endangering another plant in the area with infestation or infection; or the removal is necessitated because the tree interferes with the maintenance of flood control facilities. A native oak tree may be removed subject to an approved Improvement Plan. Trees removed under the provisions of this Section shall be replaced subject to the following requirements: • Replacement stock shall be of healthy commercial nursery stock or acorns, of the species removed or other approved species, and shall be established and maintained for at least three (3) years (Development Title Section 9-1505.4[a]). • Replacement trees shall be planted as near as possible to the location of the removed tree or in an alternative location acceptable to the Review Authority (Development Title Section 9-1505.4[b]). • Replacement stock shall be planted between October 1 and December 31, and no later than twelve (12) months after the date of tree removal (Development Title Section 9- 1505.4[c]). • The number and maintenance of replacement stock shall be as follows: o Each heritage oak tree that has been removed under the provisions of Section 9- 1505.3(a) shall be replaced with five (5) trees or acorns, or combination thereof. o Each native oak tree that has been removed under the provisions of Section 9- 1505.3(b) shall be replaced with three (3) trees or acorns, or combination thereof. o The applicant shall be required to show to the satisfaction of the Review Authority that replacement stock will be planted and maintained in such a manner as to ensure the survival of said stock at the end of a three (3) year period commencing from the date of planting. (Development Title Section 9-1505.4[d]) • The Review Authority may require, as a Condition of Approval, the applicant to provide a performance bond or other financial security to replant any replacement tree found not to be alive at the end of the required three (3) year maintenance period. The applicant may be required to provide additional security to ensure maintenance of said trees for an ensuing three (3) year maintenance period (Development Title Section 9-1505.4[e]). To protect and preserve heritage oak trees and native oak trees from development and construction activity, the following standards shall be applicable: • Grade changes near or within the dripline of said oak trees shall comply with the following: o No grade changes shall occur within six (6) feet of the trunk of the tree. o No grade changes shall occur that entail removing or adding more than six (6) inches of soil in the protected zone of the tree. a Any grade changes within the protected zone of the tree shall be accomplished so as to prevent soil compaction and injury to or removal of the tree's roots. (Development Title Section 9-1505.5[a]) • Before grading operations may commence, a minimum five (5) foot high chain link fence or other comparable protective fencing.shall be installed at the outermost edge of the protected zone of each tree or group of trees (Development Title Section 9-1505.5[b]). 3