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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 <br /> 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 3 1 /2 inches [50 to 90 mm ] Caliper : Stake all trees , other than <br /> palm trees , largerthan 2 inches [50 mm] caliperand 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 <br /> 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 Engineer to <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 /> 5804 Mulching. <br /> Uniformly apply mulch material , consisting of wood chips ( no Cypress Mulch is <br /> allowed ) , pine straw , compost , or other suitable material approved by the Engineer , to a <br /> 50 Technical Specifications <br /> F :\Public Works\ENGINEERING DIVISION PROJECTS\0744-8th St-USI to 6th Ave\Admim\bid documents\0744 CONTRACT <br /> DOCUMENTS\Technical Specifications . doc <br />