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4.1 Trees for residential classed streets shall be a minimum of 1.5 inches in caliper, measured 6 inches above mean ground level, 8 —10 feet high. 4.2 Trees for collector and arterial streets or trees abutting commercially zoned properties shall be a minimum of 2 inches in caliper, measured 6 inches above mean ground level, 10 -12 feet high. 4.3 Notwithstanding the provisions of 4.1 and 4.2, the Urban Forester may approve the planting of smaller caliper trees if trees of the appropriate caliper can be shown to be currently unavailable within the State of Oregon. If smaller caliper trees are used, the Urban Forester may extend the establishment period until the tree has reached the minimum caliper. 5. Tree Condition at Time of Planting. Trees may be provided in the following conditions at the time of planting: 5.1 Balled and burlapped and in wire baskets, providing: 5.1.1 Trees shall have a sound ball with a firm attachment of the trunk with the root ball. The trunk shall not be loose but firmly held within the root ball. 5.1.2 Root ball size and condition shall conform to the standards and specifications of the American Standard for Nursery Stock (ANSI Z- 60.1- 1996), published by the American Association of Nurserymen. 5.1.3 Root balls of trees shall not be allowed to dry out at any time from the nursery to final planting. 5.1.4 Trees shall have a well developed root system and not be root bound or have circling /girdling roots. 5.2 In a container, providing: 5.2.1 The trees are free of circling, girdling roots. 5.2.2 The trees have rooted to the inside edges of the container. 5.3 Bare root, providing: 5.3.1 Trees in a bare root condition do not exceed 1.5 inches in caliper, measured 6 inches above mean ground level. 5.3.2 The roots are not allowed to dry out and are kept moist at any time from the nursery to final planting. Administrative Order - 5