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3.3 Trees shall be provided reasonably free, as defined by nursery industry standards for street trees, from insects and disease, decay, major structural defects, and damage to the trunk, branches and root system. 3.4 Trees structural scaffold branches shall be well proportioned where they attach to the main trunk, with an average spacing of at least six inches: . 4. Street. Tree Size Standards at Time of Planting.. 4.1 Trees for residential classed streets shall be a minimum of 1.5" in caliper, measured 6" above mean ground level, 8'40' in height. • 4.2 . Trees for collector or arterial streets less than 2" caliper, but not less than 1 -1/2" caliper, may be planted using the developer .plant and option in R-7.280-B.1. If less than 2" caliper trees are used, the establishment period shall be the greater of either the standard three years or until the tree has reached 2" in caliper. 4,3 - Notwithstanding 4.1 and 4 2, .trees for all streets abutting commercially `� honed ro rties . be ntinimum�of 2" i'lip, ineasured6''-above mean ground � P Pe n ca6ir Level,. 10' -12' in height: . • • 5.' +wee Condition at Thine 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 balls shall conform to the standards and specifications. of the American Association of Nurserymen, American Standard for Nursery Stock, currently in use for size and condition. 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. Administrative Order - 11