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'19. All trees six (6) Inches in diameter or less shall be pruned with hand tools <br />only. <br />20. Chain saws will not be permitted to remove any branches two (2) Inches <br />or less in diameter. This is to prevent any unnecessary abrasions to <br />cambial tissue that may predispose a tree to insect and/or future <br />disease/decay problems. <br />21. Any extraneous metal, wire, rubber or other material interfering with tree <br />growth shall be removed when possible. <br />22. The use of climbing spurs or spike shoes in the act of pruning trees is <br />prohibited, unless specifically directed by the City to aid in the safety of <br />climbers performing the removal of a tree. <br />23. Conifers shall typically be pruned in late winter or early spring. <br />24. Contractor shall avoid damaging the central leader on all conifers. <br />25. To control the growth of large, mature conifers contractor shall be <br />required to prune the new growth of lateral limbs. <br />(2) Prune Classifications far Hardwood Trees <br />1. A Light Prune is performed when conditions within the crown of a <br />hardwood tree are such that only target pruning is needed. Trees that <br />are identified for a Light Prune shall have no more than 15% of the live <br />foliage removed. A Light Prune typically consists of one or more of the <br />following pruning treatments found in sections b, and f below: <br />2. A Grid Prune is performed when conditions within the crown of a <br />hardwood tree are such that the entire tree needs to be fully pruned. <br />Complete pruning is recommended when the primary objective is to <br />maintain or improve tree health and structure, and Includes pruning to <br />reduce overall canopy mass and excessive wood weight. Trees that are <br />identified for a Grid Prune shall have no more than 25% of the live <br />foliage removed. A Grid Prune typically consists of one or more of the <br />following pruning treatments found in sections a., b, c., d., e, and f below: <br />3. A Large Scale Prune is performed when conditions within the crown of a <br />hardwood tree are such that the entire tree needs to be fully pruned. <br />Complete pruning Is recommended when the primary objective is to <br />maintain or improve tree health and structure, and Includes pruning to <br />reduce overall canopy mass and excessive wood weight. Trees that are <br />identified for a Large Scale Prune shall have more than 25% of the live <br />foliage removed, have a diameter breast height above 29", and/or a 50' <br />spread. All Large scale pruning shall be pre -authorized by the City <br />Arborist or designee. A Large Scale Prune typically consists of one or <br />more of the following pruning treatments found in sections a., b, c., d., e. <br />and f below: <br />4. A Service Request Prune shall require Contractor to provide tree <br />maintenance services on designated tree(s) as ordered by the City <br />