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Pagc 28 of 41 <br />The Contractor shall employee a full-time, permanently certified arborist, as accredited by the <br />International Society of Arboriculture. This person is responsible for ensuring that the <br />Contractor's crews are performing work according to SAPRF specifications. <br />1.04 SPECIFIC TREE PRUNING SPECIFICATIONS <br />a. 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 />b. All persons performing tree work on SAPRF trees in or around primary electrical lines must <br />be trained to do so according to the "Electrical Safety Orders" of the State of California, <br />including all amendments and revisions. <br />c. When tree pruning cuts are made to a side limb, such remaining limb must possess a basal <br />thickness of at least one third (1 /3) of the diameter of the wound so affected Such cuts shall <br />be considered proper only when such remaining limb is vigorous enough to maintain <br />adequate foliage to produce wood growth capable of callusing the pruning cut so affected <br />within a reasonable amount of time. <br />d. All final tree pruning cuts shall be made in such a manner so as to favor the earliest possible <br />covering of the wound by natural callus growth. Flush cuts, which produce large wounds or <br />weaken the tree at the cut, shall not be made. The branch collar shall not be removed. <br />e. Tree limbs shall be removed and controlled in such a manner as to cause no damage to other <br />parts of the tree, or to other plants or property. <br />f. 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 diseases <br />and/or pest problems shall be promptly reported to an authorized SAPRF representative. <br />g. All cutting tools and saws used in tree pruning shall be kept sharpened to result in final cuts <br />with smooth wood surface and secure bark remaining intact. All trees six (6) inches in <br />diameter or less shall be pruned with hand tools only. Chain saws will not be permitted on <br />any trees six (6) inches in diameter or less. This is to prevent any unnecessary abrasions to <br />cambial tissue that may predispose a tree to insect and/or disease problems. <br />h. Whenever pruning cuts are to be made, while removing limbs too large to hold securely in <br />one hand during the cutting operation, the limbs shall be cut off first, one (1) to two (2) feet <br />beyond the intended final cut. Then the final cut shall be made in a manner to prevent <br />unnecessary tearing back of the bark and wood. Such cutting back shall not include the <br />removal of any live, healthy limbs in excess of six (6) inches in diameter without prior <br />approval from an authorized SAPRF representative. <br />SPECIFIC TREE PRUNING SPECIFICATION — Continued <br />i. No more than twenty five (25) percent of the live wood may be removed from the crown of <br />any tree, without approval of an authorized SAPRF representative, excepting live oaks, <br />25H-42 <br />