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area to provide a loose, friable mixture to a depth of at least 8 inches [200 mm]. Level the bed <br />only slightly above the adjacent ground level. Then mulch the entire bedding area, in <br />accordance with 580-8. <br />580-5 Staking and Guying. <br />580-5.1 General: When specified in the plans, or as directed by the Engineer, stake <br />plants in accordance with the following. <br />Use wide plastic, rubber or other flexible strapping materials to support the tree <br />to stakes or ground anchors that will give as the tree moves in any direction up to 30 degrees. <br />Do not use rope or wire through a hose. Use guy chords, hose or any other thin bracing or <br />anchorage material which has a minimum 12 inches [300 mm] length of high visibility flagging <br />tape secured to guys, midway between the tree and stakes for safety. <br />Stake trees larger than 1 inch [25 mm] diameter and smaller than 2 inches <br />[50 mm] diameter with a 2 by 2 inch [50 by 50 mm] stake, set at least 2 feet [0.6 m] in the <br />ground and extending to the crown of the plant. Firmly fasten the plant to the stake with <br />flexible strapping materials as noted above. <br />580-5.2 Trees of 2 to 31/2 inches [50 to 90 mm] Caliper: Stake all trees, other than <br />palm trees, largerthan 2 inches [50 mm] caliper and smallerthan 31/2 inches [90 mm] caliper <br />with two 2 by 4 inch [50 by 100 mm] stakes, 8 feet [2.4 m] long, set 2 feet [0.6 m] in the <br />ground. Place the tree midway between the stakes and hold it firmly in place by flexible <br />strapping materials as noted above. <br />580-5.3 Large Trees: Guy all trees, other than palm trees, larger than 3 1/2 inches <br />[90 mm] caliper, from at least three points, with flexible strapping materials as noted above. <br />Anchor flexible strapping to 2 by 4 by 24 inch [50 by 100 by 600 mm] stakes, <br />driven into the ground such that the top of the stake is at least 3 inches [75 mm] below the <br />finished ground. <br />580-5.4 Special Requirements for Palm Trees: Brace palms which are to be staked <br />with three 2 by 4 inch [50 by 100 mm] wood braces, toe -nailed to cleats which are securely <br />banded at two points to the palm, at a point one third the height of the trunk. Pad the trunk <br />with five layers of burlap under the cleats. Place braces approximately 120 degrees apart and <br />secure them underground by 2 by 4 by 12 inch [50 by 100 by 300 mm] stake pads. <br />580-6 Tree Protection and Root Barriers. <br />Install tree barricades when called for in the Contract Documents or by the Engineerto <br />protect existing trees from damage during project construction. Place barricades at the drip <br />line of the tree foliage or as far from the base of the tree trunk as possible. Barricades shall be <br />able to withstand bumps by heavy equipment and trucks. Maintain barricades in good <br />condition. <br />When called for in the Contract Documents, install root barriers or fabrics in <br />accordance with the details shown. <br />580-7 Pruning. <br />Prune all broken or damaged roots and limbs in accordance with established <br />arboriculture practices. When pruning is completed ensure that all remaining wood is alive. Do <br />not reduce the size or quality of the plant below the minimum specified. <br />01025-41 Technical Specifications <br />FAPublic Works\ENGINEERING DIVISION PROJECTS\0455-8th Street Sidewalk Improvements 18th Ct to Old DixieWdmim\bid <br />documents\Technical Specifications.doc <br />