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3.3 Trees shall be provided reasonably free, as defined by nursery industry <br />standards for street trees, from insects and disease, decay, major structural defects, and <br />damage to the trunk, branches and root system. <br />3.4 Trees structural scaffold branches shall be well proportioned where they <br />attach to the main trunk, with an average spacing of at least six inches. <br />4. Street Tree Size Standards at Time of Planting. <br />4.1 Trees for residential classed streets shall be a minimum of 1 inch in caliper, <br />measured 6 inches above mean ground level. <br />4.2 Trees for collector and arterial streets or trees abutting commercially zoned <br />properties shall be a minimum of 1.5 inches in caliper, measured 6 inches above mean <br />ground level. <br />4.3 Notwithstanding the provisions of 4.1 and 4.2, the Urban Forester may <br />approve the planting of smaller caliper trees if trees of the appropriate caliper can be shown <br />to be currently unavailable within the State of Oregon. If smaller caliper trees are used, <br />the Urban Forester may extend the establishment period until the tree has reached the <br />minimum caliper. <br />5. Tree Condition at Time of Planting. Trees may be provided in the following <br />conditions at the time of planting: <br />5.1 Balled and burlapped and in wire baskets, providing: <br />5.1.1 Trees shall have a sound ball with a firm attachment of the trunk <br />with the root ball. The trunk shall not be loose but firmly held within the root ball. <br />5.1.2 Root ball size and condition shall conform to the standards and <br />specifications of the American Standard for Nursery Stock (ANSI Z-60.1-1996), <br />published by the American Association of Nurserymen. <br />5.1.3 Root balls of trees shall not be allowed to dry out at any time from <br />the nursery to final planting. <br />5.1.4 Trees shall have a well developed root system and not be root bound <br />or have circling /girdling roots. <br />5.2 In a container, providing: <br />5.2.1 The trees are free of circling, girdling roots. <br />5.2.2 The trees have rooted to the inside edges of the container. <br />Administrative Order - Page 5 of 14 <br />