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substantially damaged. An arborist shall be onsite during any tree work (i.e. root pruning, trimming, setting up tree protection, etc.). The bond or security may be released early with a certification letter by the arborist confirming he/she was present during said tree work and work was performed in accordance with the arborist's recommendations. 63. ROOT CUTTING: The applicant shall comply with the following tree root cutting requirements: a. Roots 1 -inch in diameter or larger to be removed shall be cleanly cut with a hand saw. Roots smaller than 1 -inch in diameter are not considered to be significant and may be removed by the most efficient means. b. Roots larger than 2 -inches in diameter and within 8 -feet of the tree trunk shall not be cut or ground unless prior approval has been received from the Landscape Architecture Division. C. Roots of any diameter farther than 8 -feet from the tree trunk, which are in conflict with the proposed work may be ground a maximum of one-half of their diameter. Work of this nature shall only be performed using a mechanical stump grinder and only by personnel familiar with its operation. d. Roots up to 6 -inches in diameter and farther than 8 -feet from the tree trunk may be removed if they are in conflict with the proposed work. Roots that are removed shall be cleanly cut using a hand saw. 64. ROOT CONTROL BARRIER: The applicant shall provide root control barriers and 4 -inch perforated pipe for all trees located within 8 -feet of pavement or other hardscape, determined by the City Landscape Architect. Root barriers shall be located along the edge of the pavement wherever the tree is within 8 -feet of pavement or hardscape. Information and details shall be included in the landscape plan submittal for review and approval by the Landscape Architecture Division. 65. TREE PRUNING: Pruning shall be conducted by a certified arborist familiar with the International Society of Arboriculture (ISA) pruning guidelines and shall comply with the guidelines established by the ISA, Tree Pruning Guidelines, current edition, to maintain the health of the trees. 66. TREE PROTECTION FENCING: Prior to issuance of a grading or building permit, the applicant shall install temporary 6 -foot -tall chain-link fencing (or other fence type acceptable to the Landscape Architecture Division) outside of the existing tree drip lines. The location of the tree protection fencing shall be shown on the demolition plans (if applicable), grading, building, and/or landscape plans. The fencing shall remain in place until final landscape inspection by the Landscape Architecture Division. Removal of such fencing prior to approval may result in a "stop work order." 67. PROJECT PLANS: The following statements shall be printed on the demolition, grading and landscape plans where applicable to the satisfaction of the City Landscape Architect prior to issuance of building permits: a. No existing tree may be trimmed or pruned without prior approval by the City Landscape Architect. b. Utilize best efforts to locate any new utility trenches outside of the existing canopy of the trees to be saved. If this is not feasible, the applicant shall submit PUD -144, 3747 Trenery Drive City Council Page 11 of 12