Any tree planted 10 feet or closer to a building shall have an impenetrable root barrier <br />installed near the building: The root barrier shall run the length of the planting area or the <br />structure, and reach a depth of at least 18 inches. <br />6.6 Vehicular area: Provisions shall be made to prevent any parts of the <br />vehicles from touching trees. <br />6.7 Shrubs planted in the street side right-of--way: Shrubs shall follow the <br />minimum distance requirements for trees for curbs, sidewalks, and utilities. No shrub <br />shall be planted within 3 feet of a building. <br />6.8 Linear spacing: Trees shall be placed an average of every 30 feet while <br />meeting the location standards of these rules, unless a different spacing is required under <br />Sections 9.2175(3)(c) or 9.3815(2)(e)3. of the Eugene Code, 1971. <br />6.9 Width of~lanting, area within Cityright-of--way (i. e. ,distance between the <br />curb and sidewalk): <br />6.9.1 No tree shall be planted where the planting area is less than 4 feet <br />wide without prior approval of the Urban Forester. <br />6.9.2 The minimum width of a planting site for each tree shall be <br />governed by the approved street tree list. <br />6.10 Width of medians: No tree shall be planted in any median that has a <br />planting area less than 4 feet wide. On State rights-of--way, Oregon Department of <br />Transportation's "Guidelines for Planting Within Highway Right-of--Way" apply. <br />6.11 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 <br />15th and March 15th unless otherwise approved by the Urban Forester. Balled and <br />burlapped or container grown trees may be planted only between September 15th and <br />April 15th unless otherwise approved by the Urban Forester. <br />7.2 Site preparation. <br />7.2.1 Balled and burlapped and container grown trees: <br />Administrative Order - 7 <br />