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limb in order to reduce end weight and thus decrease the likelihood of <br />limb failure. <br />11. Selectively reduce and /or remove branches that create sight line conflicts <br />with traffic control signs and /or devices. <br />12. Selectively reduce and /or remove branches that are within five (5) feet of <br />a structure. <br />13. Clear trees of sprout or sucker growth to a minimum height of ten (10) <br />feet above ground level. Exceptions are allowed for young trees, which <br />would be irreparably damaged by such pruning action. <br />14. Prune so as to maintain a balanced appearance when viewed from the <br />opposite side of the street immediately opposite the tree, unless <br />authorized by the City Arborist to do otherwise. <br />15. Remove all vines entwined in trees and on tree trunks. Vine tendrils shall <br />be removed without injury to trees. <br />16. Tree limbs shall be removed and controlled in such a manner as to <br />cause no damage to other parts of the tree, or to other plants or property. <br />17. All tools used on a tree known to contain an infectious tree disease shall <br />be properly disinfected immediately before and after completing work on <br />such tree. All major pest problems shall be promptly reported to the City. <br />18. All cutting tools and saws used in tree pruning shall be kept sharpened to <br />result in final cuts with an un- abrasive wood surface and secure bark <br />remaining intact. <br />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 />(2) Prune Classifications for Hardwood Trees <br />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 />City of Santa Ana Street Tree Maintenance RFP <br />19E -28 Page 25 <br />