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and safety practices of those who earn the credential. Along with proven knowledge of CPR and first aid, candidates have been tested on safety procedures, and must be able to complete thorough truck and tree inspection. 1.04 SPECIFIC TREE PRUNING SPECIFICATIONS a. All persons performing tree work on SAPRF trees must be trained according to tree care standards accepted by the International Society of Arboriculture. b. All persons performing tree work on SAPRF trees in or around primary electrical lines must be trained to do so according to the "Electrical Safety Orders" of the State of California, including all amendments and revisions. c. When tree pruning cuts are made to a side limb, such remaining limb must possess a basal thickness of at least one third (1/3) of the diameter of the wound so affected. Such cuts shall be considered proper only wben such remaining limb is vigorous enougb to maintain adequate foliage to produce wood growth capable of callusing the pruning cut so affected within a reasonable amount of time. d. All final tree pruning cuts shall be made in such a manner so as to favor the earliest possible covering of the wound by natural callus growth. Flush cuts, which produce large wounds or weaken the tree at the cut, shall not be made. The branch collar shall not be removed. e. Tree limbs shall be removed and controlled in such a manner as to cause no damage to other parts of the tree, or to other plants or property. f All tools used on a tree known to contain an infectious tree disease shalt be properly disinfected immediately before and after completing work on such trec. All major diseases and/or pest problems shall be promptly reported to an authorized SAPRF representative. g. All cutting tools and saws used in tree pnining shall be kept sharpened to result in final cuts with smooth wood surface and secure bark remaining intact. All trees six (6) inches in diameter or less Shalt be pruned with hand tools only. Chain saws will not be permitted on any trees six (6) inches in diameter or less. This is to prevent any unnecessary abrasions to cambial tissue that may predispose a tree to insect and/or disease problems. h. Whenever pruning cuts are to be made, while removing limbs too large to hold securely in one hand during the cutting operation, the limbs shall be cut off first, one (1) to two (2) feet beyond the intended final cut. Then the final cut shall be made in a manner to prevent unnecessary tearing back of the bark and wood. Such cutting back shall not include the removal of any live, healthy limbs in excess of six (6) inches in diameter without prior approval from an authorized SAPRF representative. No more than twenty five (25) percent of the live wood may be removed from the crown of any tree, without approval of an authorized SAPRF representative, excepting live oaks, wbicb are limited to no more than ten (10) percent. Resulting in keeping as much of the crown of the tree as possible. j. Any extraneous metal, wire, rubber or other material (i.e. stakes, ties) interfering with tree growth shall be removed immediately, 6istrfcts 1, 4 and 5 Park Landscape RFP 1 ��=B7