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2016 Draft Landscaping Code <br />4. In general, deciduous trees with open branching structures are recommended to ensure <br />visibility to retail establishments. More substantial shade trees or evergreens are <br />recommended in front of private residences. <br />18.52.50 Significant Tree Retention <br />A. All significant trees located within any required landscape area that are not dead, dying, <br />diseased, or a nuisance species, as identified in the Tukwila Approved Tree List, and that <br />do not pose a safety hazard, or conflict with overhead utility Ilinesl as determined by the <br />City or an ISA certified arborist, shall be retained and protected during construction with <br />temporary fencing or other enclosure, as appropriate to the site and following Best <br />Management Practices for tree protection (See TMC Chapter 18.541,.) <br />B. <br />Retained significant trees may be counted towards required landscapingl. For each two <br />percent of effective canopy cover provided by preserved trees incorporated into a <br />development plan, a two percent reduction in the minimum landscape requirement may <br />be granted. No more than 20% of the minimum landscape requirement may be reduced <br />for any one development. Approval is required per TMC Section 18.52.100. <br />Commented [CL47]: A. Is a mix of TMC 18.52.030 D. 10 <br />and 18.28.240 B.l.f. 11 <br />Commented [CL48]: Added at request of PSE <br />Commented [AC49]: Revisions to TMC 18.54, the City's <br />tree regulations, will propose tree protection requirements. <br />........ ......... ......... ......... ......... ......... <br />Commented [CL50]: From Tigard Municipal Code - <br />18.790.050 CA. — modified to allow 2% reduction m <br />required landscaping rather than Tigard's 1% reduction <br />allowance. <br />C. The area designated for protection will vary based on the tree's diameter, (species, age, Commented [CL51]: Portion of C. from 18.28.240 B. <br />and the characteristics of the planted area and utilize Best Management Practices for <br />Protection (See TMC Chapter 18.54). Property owners may be required to furnish a <br />report by an ISA certified arborist to document a tree's condition if a tree is to be retained. <br />The Director may require that an ISA certified arborist be retained to supervise tree <br />protection during construction. Grade changes around existing trees within the critical <br />root zone are not allowedl. Commented [CL52]: Last sentence revised by Advisory <br />Committee. <br />18.52.060 Plant Material Requirements and Tree Standards <br />A. Plant Material Requirements <br />1. Plants shall meet the American Standard for Nursery Plant Stock (American Nursery and <br />Landscape Associations -ANLA) (ANSI Z60.1) as it now reads and as hereafter amended, <br />and shall be healthy, vigorous and well- formed, with well - developed, fibrous root <br />systems, free from dead branches or roots. Plants shall be free from damage caused by <br />temperature extremes, pre - planting or on -site storage, lack of or excess moisture, <br />insects, disease, and mechanical injury. Plants in leaf shall be well foliated and of good <br />color. Plants shall be habituated to outdoor environmental conditions (i.e. hardened -biffL).— Commented [CL53]: From 18.52.030 D.I. <br />. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <br />2. Evergreen trees shall be a minimum of 6 feet in height at time of plantingl. commented [CL54]: 18.52.030 D.6. <br />----------------------------------------------------------------------------------------- - - - - -- <br />3. Deciduous trees shall have at least a two inch caliper at time of planting as measured 4.5 ft. <br />from the ground, determined according to the American Standard for Nursery Stock as it <br />now reads and as hereafter amended. <br />Page 10 of 19 11/2/2016 6:15 PM <br />W:\ \Long Range Projects \2016 Landscaping Code Update \Draft TMC Chapter 18.52- Advisory Committee Revisions -2 <br />IN <br />