Specifications include, but are not limited to: To Provide Tree Pruning, Dead Wooding and Removal at Wailuku River State Park-Rainbow Falls Area. Pruning Tree pruning shall include appropriate cutting and specified disposal of cutting debris of the trees designated for pruning. The primary objective of pruning trees is to minimize risk to persons and property from the fall of trees or tree parts, and to provide proper tree clearances from roadways, sidewalks, lights, signs, buildings and other structures. Pruning shall only be conducted in conformance with the most current version of the ANSI A300-Part 1 Pruning Standard and according to clear objectives as defined by pruning type. Pruning for this project includes: Crown cleaning Crown reduction & raising Crown Cleaning: Unless otherwise specified or directed by DSP’s QA, all routine maintenance pruning operations, including when conducting crown reduction pruning, shall always include crown cleaning. Crown cleaning practices shall include: Removal of large (> 1 inch diameter) dead branches; and Removal of all diseased, insect-infested, damaged and broken branches; and Removal of crossing branches appropriate for removal as specified by the QA; and Re-cutting of old pruning stubs that will properly compartmentalize; and Removal of all epiphytes, vines and other invasive plants growing on the tree; and Reduction of density and structuring of excessive watersprouts within resprouting clumps by no more than 33%. Crown Reduction & Raising: When specified, crown reduction pruning shall be conducted to reduce crown weight and wind resistance to reduce the risk of failure of the tree or tree parts and/or reduce the height and/or spread of the tree in order to clear and prevent physical or visual obstacles for nearby infrastructure, people or vehicles. Crown reduction pruning includes: Crown cleaning as described above; and Identification of the desired height and/or spread of the tree crown; Identification of branches that should be removed/reduced to achieve desired clearance and/or risk reduction; and Removal of targeted branches to the point of origin or to a lateral branch that is at least 1/3 the diameter of the branch removed. Reasonable attempts should be made to maintain a natural form and structure of the tree during the crown reduction process. Maximum Removal of Foliage and Healthy Wood: When conducting crown reduction pruning, no more than 25% of the total foliage and healthy wood of a tree should be removed during any pruning event unless approved, in writing, by a QA. No more than 50% of the branches and foliage should be removed along the upper 2/3 of scaffold branches and the tree unless approved, in writing, by a QA. Tree Removal Tree removal shall include felling and specified disposal of the above ground portion of trees designated for removal. A 230’ X 50” Buffer next to Hospital Fence Line as shown in Attachment I Stump Height: Stumps shall be cut as close to the ground as practical, parallel to any slope and at a height not exceeding 1 inch above ground level unless obstacles prevent cutting lower stumps. Stumps exceeding 1 inch shall only be as approved by the DSP Designated Project Manager.
