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Assuring adequate safety of employees and the public. <br />Prior to starting any tree work on an SAPRF tree, the Contractor must contact an <br />authorized SAPRF representative. Contact Mike Lopez, Sr. Park Services Supervisor at <br />(714)571-4212 Office or (714) 231-6112 cell phone. <br />1.03 CERTIFIED ARBORIST <br />The Contractor shall employee a full-time, permanently certified arborist, as accredited <br />by the International Society of Arboriculture. This person is responsible for ensuring that <br />the 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 <br />care standards accepted by the International Society of Arboriculture. <br />b. All persons performing tree work on SAPRF trees in or around primary electrical <br />lines must be trained to do so according to the "Electrical Safety Orders" of the State <br />of California, including all amendments and revisions. <br />C. 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. <br />Such cuts shall be considered proper only when such remaining limb is vigorous <br />enough to maintain adequate foliage to produce wood growth capable of callusing <br />the pruning cut so affected 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 <br />possible covering of the wound by natural callus growth. Flush cuts, which produce <br />large wounds or weaken the tree at the cut, shall not be made. The branch collar <br />shall not be removed. <br />e. Tree limbs shall be removed and controlled in such a manner as to cause no damage <br />to other 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 <br />diseases and/or pest problems shall be promptly reported to an authorized SAPRF <br />representative. <br />g. All cutting tools and saws used in tree pruning shall be kept sharpened to result in <br />final cuts with smooth wood surface and secure bark remaining intact. All trees six <br />(6) inches in diameter or less shall be pruned with hand tools only. Chain saws will <br />not be permitted on any trees six (6) inches in diameter or less. This is to prevent <br />any unnecessary abrasions to cambial tissue that may predispose a tree to insect <br />and/or disease problems. <br />Whenever pruning cuts are to be made, while removing limbs too large to hold <br />securely in one hand during the cutting operation, the limbs shall be cut off first, one <br />(1) to two (2) feet beyond the intended final cut. Then the final cut shall be made in <br />a manner to prevent unnecessary tearing back of the bark and wood. Such cutting <br />back shall not include the removal of any live, healthy limbs in excess of six (6) <br />inches in diameter without prior approval from an authorized SAPRF representative. <br />41 <br />