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3.1 The tree shall have a straight trunk perpendicular to the ground with a <br />minimum branching height at 4' above the ground for trees 1.5" in caliper to a minimum of <br />6' above the ground for trees 2" in caliper. <br />3.2 Trees shall be grown to the standards and specifications of the American <br />Association of Nurserymen, American Standard for Nursery Stock, currently in use. <br />3.3 Trees shall be provided reasonably free, as defined by nursery industry <br />standards for street txees, 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 Plantin . <br />4.1 Trees for residential classed streets shall be a minimum of 1.5" in caliper, <br />measured 6" above mean ground level, 8'~ 10' in height. <br />4.2 Trees far collector or arterial streets less than 2" caliper, but.not less than 1- <br />112" caliper, may be planted using the developer plant and option in R-7.280-B.1. if less <br />than 2" caliper trees are used, the establishment period shall be the greater of either the <br />standard three years or until the tree has reached 2" in caliper. <br />4.3 Notwithstanding 4.1 and 4.2, trees for all streets abutting commercially zoned <br />properties shall be a minimum of 2" in caliper, measured 6" above mean ground level,l0'-12' <br />in height. <br />5. Tree-Condition at _Timeuf Planti~. 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 />S .1.1 Trees shall have a sound ball with a f irm attachment of the t~r~ulk with <br />the root ball. The trunk shall not be loose but firmly held within the root ball. <br />5.1.2 Root balls shall conform to -the standards and specif cations of the <br />American Association of Nurserymen, American Standard for Nursery Stock, <br />currently in use for size and condition. <br />5.1.3 .Root balls of trees shall not be allowed to dry out at any time from the <br />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 />Exhibit B to Street Tree Plan Agreement <br />97-00421 <br />