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Home My WebLink About23 DIR-0366-2023 City of SLO Standard Specifications 2016-Tree ProtectionCITY OF SAN LUIS OBISPO PUBLIC WORKS DEPARTMENT – ENGINEERING DIVISION 2016 STANDARD SPECIFICATIONS DIVISION VIII – MISCELLANEOUS CONSTRUCTION 77 LOCAL INFRASTRUCTURE 77-1 EXCAVATION AND RESTORATION 77-1.03 CONSTRUCTION 77-1.03A Excavation 77-1.03A(2) Tree Protection 77-1.03A(2)(a) Protection Fences Install a 5-foot tall fence around drip-line of trees to be saved, or as directed by the Engineer, before any work starts on the site. The tree protection fence may be chain link fabric or orange safety fencing secured with steel fence poles set at 8 feet on center. The poles must be 6 feet long and 1.5 inches in diameter, driven into the ground 12 inches. Tree protection fences must: 1. remain in place 2. continually maintained 3. removed as the last item of contract work. 77-1.03A(2)(b) Pruning Pruning of tree limbs will only be allowed if approved by the Engineer. Tree pruning must be done by a certified arborist per International Society of Arboriculture (ISA) standards. 77-1.03A(2)(c) Parking And Storage Of Building Materials Do not: 1. park vehicles 2. park construction equipment or 3. stockpile within the drip-line of trees to be saved. 77-1.03A(2)(d) Dumping Do not deposit: 1. water 2. waste or 3. construction materials within 20 feet of drip-line of trees to be saved. 77-1.03A(2)(e) Herbicide Use Do not use herbicide including pre and post emergents within 20 feet of drip-line of trees to be saved. 77-1.03A(2)(f) Trunk Protection Do not attach anything to any portion of trees to be saved. If you wound a tree to be saved, immediately expand tree protective fencing and treat tree wound to the satisfaction of the Engineer. If severe tree damage occurs you may be fined in compliance with the City's tree ordinance. 77-1.03A(2)(g) Excavation, Grading, Trenching And Boring (Trenching:) No trenching of any depth will be allowed within the drip-line of trees or shrubs to be saved, unless approved by the Engineer. If you plan to trench within 20 feet of the drip-line of tree to be saved, layout trench location with chalk or paint, and notify the Engineer for review and approval before trenching work begins. If the Engineer approves trenching within the drip-line of trees or shrubs to be saved, trenching excavation must be done by hand. Trenching outside the drip-line of trees to be saved and within 20 feet of drip-line of trees to be saved is not required to be completed by hand. (Grading:) No grading cuts or fills will be allowed within the drip-line of trees to be saved, unless approved by the Engineer. (Excavation:) During excavation if any roots are encountered less than 1 inch in diameter, the root may be cut by hand leaving a square end. (Excavation:) During excavation if any roots are encountered greater than 1 inch in diameter, the root must be protected from: 1. scarring 2. drying 3. then tunneled under. If the root cannot be protected, you must schedule the Engineer and City Arborist to review excavation and give direction. (All) Shade roots from direct sunlight when exposed in open trench. Pruned or cut roots must be reviewed by the Engineer prior to backfilling trench. Trench must be backfilled within 24 hours of encountering roots. (Boring:) All directional boring within drip-line trees to be saved must maintain a minimum depth of 5 feet. If severe tree or root damage occurs you may be fined in compliance with the City's tree ordinance. 77-1.03A(2)(i) Tree Removals Trees not shown and identified on the plans to be removed, but are required to be removed in order to complete the work, are subject to the City's tree removal policies and procedures. Coordinate tree removal policy compliance with Engineer . 77-1.03A(2)(j) Tree Protection Plan If the approved project plans preclude compliance with all requirements of section 77-1.03A(2), you must provide the services of a Certified Arborist to develop a tree protection and monitoring plan and implement the plan. The tree protection plan must include: 1. establishment zones of protection for each tree 2. provide pre-construction worker training 3. site monitoring during construction 4. recommended treatments for tree wounds if damaged 5. identify post construction inspections and maintenance requirements. Submit plan to Engineer for review and approval prior to the start of any site work. (Italicized text in Section 77-1.03A(2)(g) are not part of the Code text but are added for clarification)