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improve the productivity, quality of care, and safety practices of those who earn the <br />credential. Along with proven knowledge of CPR and first aid, candidates have been <br />tested on safety procedures, and must be able to complete thorough truck and tree <br />inspection. <br />5.0 SPECIFIC TREE PRUNING SPECIFICATIONS <br />5.1 All persons performing tree work on SAPRF trees must be trained according to tree care <br />standards accepted by the International Society of Arboriculture, <br />5.2 All persons performing tree work on SAPRF trees in or around primacy electrical lines <br />must be. trained to do so according to the "Electrical Safety Orders" of the State of <br />California, including all amendments and revisions. <br />5.3 When tree pruning cuts are made to a side limb, such remaining limb must possess a <br />basal thickness of at least one third (1/3) of the diameter of the wound so affected. Such <br />cuts shall be considered proper only when such remaining limb is vigorous enough to <br />maintain adequate foliage to produce wood growth capable of callusing the pruning cut <br />so affected within a reasonable amount of time. <br />5.4 All final tree pruning cuts shall be made in such a manner so as to favor the earliest <br />possible covering of the wound by natural callus growth. Flush outs, which produce large <br />wounds or weaken the tree at the cut, shall not be, made. The branch collar shall not be <br />removed. <br />5.5 Tree limbs shall be removed and controlled in such a manner as to cause no damage to <br />other parts of the tree, or to other plants or property. <br />5.6 All tools used on a tree known to contain an infectious tree disease shall be properly <br />disinfected immediately before and after completing work on such tree. All major <br />diseases and /or pest problems shall be promptly reported to an authorized SAPRF <br />representative. <br />5,7 All cutting tools and saws used in tree pruning shall be kept sharpened to result in final <br />cuts with smooth wood surface and secure bark remaining intact. All trees six (6) inches <br />in diameter or less shall be pruned with hand tools only. Chain saws will not be <br />pennitted on any trees six (6) inches in diameter or less, This is to prevent my <br />unnecessary abrasions to cambial tissue that may predispose a tree to insect and /or <br />disease problems. <br />5.8 Whenever pruning cuts are to be made, while removing limbs too large to hold securely <br />in one hand during the cutting operation, the limbs shall be cut off first, one (l) to two (2) <br />feet beyond the intended final cut. Then the final cut shall be made in a manner to <br />prevent unnecessary tearing back of the bark and wood. Such cutting back shall not <br />include the removal of any live, healthy limbs in excess of six (6) inches in diameter <br />without prior approval from an authorized SAPRF representative. <br />5.9 No more than twenty five (25) percent of the live wood may be removed from the crown <br />of any tree, without approval of an authorized SAPRF representative, excepting live oaks, <br />