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2572 <br />748 Minnesota 2020 Standard Specifications <br />A.8 Oak Trees <br />Avoid wounding of oak trees during April, May, June, and July to prevent the spread of <br />oak wilt. If the Engineer determines that Work must take place near oak trees during those <br />months, immediately (within 5 minutes) treat resulting wounds with a wound dressing Material <br />consisting of latex paint or shellac. Blend paint colors with the bark color. Maintain a supply of <br />approved wound dressing on the Project at all times during this period. <br />A.9 Tree Growth Retardant (TGR) <br />Provide an arborist certified by the International Society of Arboriculture to treat trees <br />with the TGR as required by the Contract or as directed by the Engineer. Ensure the arborist <br />applies the TGR paclobutrazol as a basal drench or soil injection and in accordance with the label <br />directions. Provide the Engineer with the product label and Material Safety Data Sheet for the <br />product used. <br />A.10 Other Vegetation Protection Measures <br />Provide other vegetation protection measures including root system bridging, <br />compaction reduction, aeration, irrigation systems, J -barriers for Specimen Tree protection, and <br />retaining walls as required by the Contract or as directed by the Engineer. <br />B Quarantined Wood ....................................................................................................... 2101.3D.4 <br />C Plant Installation .................................................................................................................. 2571 <br />D Disposal of Material and Debris ....................................................................................... 2104.3D <br />2572.4 METHOD OF MEASUREMENT <br />A Temporary Fence <br />The Engineer will measure temporary fence placed, maintained, and removed by length along <br />the bottom of the fence between end posts. <br />B Clean Root Cutting <br />The Engineer will measure clean root cutting by length along the plow line. The Engineer will <br />determine the beginning and ending points for clean root cutting as the intersection of the construction <br />limit and the dripline of the tree or Brush or in accordance with lines shown on the Plans. <br />C Water <br />The Engineer will measure water by volume used to protect and restore vegetation. The Engineer <br />will not measure water otherwise used in performing the Work, such as for maintenance of sod. <br />D Rooting Topsoil Borrow <br />The Engineer will measure rooting topsoil borrow by loose volume as required by the Contract. <br />E Pruning <br />The Engineer will measure pruning by the hours of actual pruning Work. <br />F Tree Growth Retardant (TGR) <br />The Engineer will measure TGR by volume of Material applied for the size of the tree treated. The <br />Engineer will determine the volume of TGR required by the diameter at breast height (DBH) of each tree <br />treated. DBH is defined as 4.5 feet above ground level. The Engineer will use a diameter tape measure to <br />measure DBH. <br />SECTION 2572.4 NOT USED