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6.10.1 No tree shall be planted where the rooting space is less than four <br />feet (4') in width without prior approval of the Urban Forester. <br />6.10.2 The minimum width of a planting site for each tree shall be <br />governed by the approved street tree list. <br />6.10.3 No trees that commonly produce a large buttress root system shall <br />be planted in a site less than eight feet (8') wide (i.e., Quercus phellos, Acer <br />macrophyllum, Liquidambar styraciflua). <br />6.11 Width of medians: No tree shall be planted in any median that is less than <br />ten feet (10') in width. On State rights-of--way, Oregon Department of Transportation's <br />"Guidelines for Planting Within. Highway Right-of--Way" apply. <br />6.12 Exemptions to the tree location standards: Where special conditions exist, <br />the Urban Forester may waive these tree planting location standards. Such a waiver shall <br />be on a case by case basis. <br />7. Street Tree Planting Standards. <br />7.1 Planting Season. Bare root trees may be planted only between October 15th <br />and March 15th unless otherwise approved by the Urban Forester. Balled and burlapped <br />or container grown trees may be planted only between September 15th and April 15th <br />unless otherwise approved by the Urban Forester. <br />7.2 Site preparation. <br />7.2.1 Balled and burlapped and container grown trees: <br />7.2.1.1 Dig a shallow, broad tree planting hole at least 1-1/2 times <br />the diameter of the root ball and to a depth that will allow the trunk flare <br />to be level with existing ground. (See Appendix B.) <br />7.2.1.2 Score the edge of the hole to leave the edges rough and not <br />smooth. This will encourage rooting into the existing native soil. <br />7.2.2 Bare-root stock: <br />7.2.2.1 Dig tree-planting holes 1' wider than the spread of the roots <br />to allow the roots sufficient area. The hole shall have sufficient depth to <br />allow the trunk flare to be level with the existing ground. (See Appendix <br />B.) <br />7.2.2.2 Leave a mound in the center of the hole to drape and <br />spread roots in their natural position over the mound. (See Appendix B.) <br />8. Planting General Conditions. <br />Street Tree Plan Agreement -City Plants Alternate - 18 of 25 ~ Q O 0 4 2 8 <br />