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based on the size and growth habit of the tree. 6.10 Width of planting area within City right -of -way ( i.e., distance between the curb and sidewalk): 6.10.1 No tree shall be planted where the rooting space is less than four feet (4') in width without prior approval of the Urban Forester. 6.10.2 The minimum width of a planting site for each tree shall be governed by the approved street tree list. 6.10.3 No trees that commonly produce a large buttress root system shall be planted in a site less than eight feet (8') wide (i.e., Quercus phellos, Acer macrophyllum, Liquidambar styraciflua). 6.11 Width of medians: No tree shall be planted in any median that is less than ten feet (10') in width. On State rights -of -way, Oregon Department of Transportation's "Guidelines for Planting Within Highway Right -of -Way" apply. 6.12 Exemptions to the tree location standards: Where special conditions exist, the Urban Forester may waive these tree planting location standards. Such a waiver shall be on a case by case basis. 7. Street Tree Planting Standards. 7.1 Planting Season. Bare root trees may be planted only between October 15th and March 15th unless otherwise approved by the Urban Forester. Balled and burlapped or container grown trees may be planted only between September 15th and April 15th unless otherwise approved by the Urban Forester. 7.2 Site preparation. 7.2.1 Balled and burlapped and container grown trees: 7.2.1.1 Dig a shallow, broad tree planting hole at least 1 -1/2 times the diameter of the root ball and to a depth that will allow the trunk flare to be level with existing ground. (See Appendix B.) 7.2.1.2 Score the edge of the hole to leave the edges rough and not smooth. This will encourage rooting into the existing native soil. 7.2.2 Bare -root stock: Street Tree Plan H: \O2StreetTreePlan- FullRules.wpd