Specifications include, but are not limited to: 1. Inspection Report: The Contractor shall provide a Certified Arborist to conduct field inspections on trees selected for evaluation by the City. Contractor must submit an International Society of Arboriculture (ISA) Basic Tree Risk Assessment Form within two (2) business days upon completed inspection (Attachment A). An alternative form may be used if approved by the City. The risk assessment shall be performed by a certified Tree Risk Assessment Qualification (TRAQ) professional. 2. Pruning: The primary goal is emphasis on tree health, structure and overall appearance. No more than twenty-five percent (25%) of live wood or foliage may be removed from the crown of any adult tree. The City may request the following services; structural pruning (young trees), crown cleaning, crown thinning, raising, reduction or restoration depending on tree needs. Pollarding, "heading cuts," or "topping" should only be used in extreme cases, as not all trees are able to withstand this type of pruning. Contractor shall have working knowledge of the American National Pruning Standards (A300) and ISA Tree pruning Guidelines, and shall adhere to the most recent edition of the American National Standard for Tree Care Operations (Z133.1). The Contractor shall secure traffic control permitting, if required, prior to commencement of work. All work shall be started within five (5) business days of a notice to proceed from the City. The Contractor will be required to meet onsite with a City Representative to review and schedule work. All work defined within the work order must be completed to the satisfaction of the City prior to starting new work orders. Pruning without authorization from the City will not be compensated. a. Group Pruning: Contractor may be issued a work order for multiple trees to be pruned within a close geographic area. Pruning will be paid per inch diameter of the tree trunk measured at diameter at breast height. Disposal of all material from pruning and trimming is the responsibility of the Contractor and should be included in the bid price. b. Individual Pruning: Contractor may be issued a work order for pruning an individual tree to address an issue at a specific location. Pruning will be paid per inch diameter of the tree trunk measured at diameter at breast height. Disposal of all material from pruning and trimming is the responsibility of the Contractor and should be included in the bid price. c. Palm Tree Pruning: Contractor may be issued a work order to prune palm trees. Pruning of palm fronds, including the removal of fruit, occurs during the months of July and August. The City will provide a list of locations, palm species and count to the Contractor for review. Once the Contractor has verified the list they will submit a schedule to the City Representative for approval. Palm tree pruning must be completed before September 1st . d. Line Clearance Pruning: Contractor shall insure that all personnel are employees of the Contractor and are qualified high voltage tree trimmers as set forth in OSHA 1910.269 (a)(2) Tasked Qualified Line Clearing Tree Trimmers to work up to but not in Minimum Approach Distance of energized exposed equipment and conductors 269(a)(2) Qualified Workers with the properly rated equipment. The Contractor shall not sub-contract any portion of the line clearance work. For line clearance work, Workers, Leads and/or Foreman positions, shall have a minimum of three (3) years’ experience in clearing/trimming around high voltage lines up to 69kV. Helpers shall have a minimum of two (2) years trimming experience on electric systems.
