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Draft Chapter 18.28 Tukwila Urban Center (TUC) District <br />C. General Landscaping Guidelines <br />1. Plant Materials <br />a. Landscape perimeter trees should be selected for compatibility with existing plant material or <br />street trees. <br />b. Plant materials should always be incorporated into new development site design to provide <br />"softening" of hard paving and building surfaces and other environmental benefits. <br />c. Drought resistant species are encouraged, except where site conditions within the required <br />landscape areas assure adequate moisture for growth. <br />d. The mature size of selected tree species should be suitable to lot size, the scale of adjacent <br />structures, and the proximity to utility lines. <br />e. Both seasonal and year -round flowering shrubs and trees should be used where they can be <br />most appreciated adjacent to walks and recreational areas, or as a frame for building <br />entrances and stairs. <br />f. In general, deciduous trees with open branching structures are recommended to ensure <br />visibility to retail establishments. More substantial shade trees are recommended in front of <br />private residences. <br />g. All trees should be selected and located so that they will not obstruct views to showroom <br />windows and building signage as they mature. Trees may be limbed up to preserve views, <br />except that no more than 1/3 of the canopy may be removed in any two year period. <br />h. Evergreen landscaping is appropriate for screening utility vaults, loading docks and some <br />storage areas (Also, see TMC Chapter 18.52.040 screening outdoor storage areas). <br />Figure 31 Using evergreen landscaping to screen utilities <br />i. Landscaped tree wells, planting strips, and /or parking lot islands should be fully landscaped <br />with trees, shrubs and groundcover. Benefits include increased shading, less <br />evapotranspiration, less soil compaction, greater shared soil volume, and less reflective heat <br />absorbed by a single tree. Species selection is very important in grouped plantings. Drought <br />ZADCD n Clerk's \PC Laserfiche Packet \5 -24 -12 PC Packet \FINAL PC BOOK2_5.18.12_clean.docx Page 55 5/18/2012 <br />67 <br />