Planning 2012-06-28 COMPLETE AGENDA PACKET

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Draft Chapter 18.28 Tukwila Urban Center (TUC) District frontages) and trees as they mature, shall be limbed up to a minimum height of 6 feet (8 feet where they extend over sidewalks) to allow adequate visibility. No more than 1/3 of the canopy may be removed within any 2 -year period. Pruning may need to be done over a 2 -3 year period to avoid harming the trees or shrubs. Pruning shall be done in accordance with ANSI Standard A 300. If existing shrub species cannot tolerate this kind of pruning, they shall be replaced with shrubs that do not grow taller than 5 feet (3 feet along street frontages) naturally. Trees may not be topped by property owners or tenants for any reason. Trees may only be topped for utility safety to prevent interference with a utility line, with prior approval by the DCD Director. c. Landscaping shall not obstruct views from or into the driveway, sidewalk or street. Landscape design shall allow for surveillance from streets and buildings and avoid creating areas that might harbor criminal activity. d. Landscaping at crosswalks and other locations where vehicles and pedestrians intersect must not block pedestrians' and drivers' views. e. Evergreen shrubs and trees shall be used for screening along rear property lines, around solid waste /recycling areas and mechanical equipment, and to obscure grillwork and fencing associated with subsurface parking garages. 3. Soil Preparation and Planting a. Soils must be prepared for planting in accordance with BMP T5.13 "Post Construction Soil Quality and Depth from the Washington Department of Ecology Stormwater Management Manual for Western Washington (or as amended), regardless of whether a stormwater permit is required by the City. b. The applicant will be required to schedule an inspection by the City of the planting areas prior to planting. c. Installation of landscape plants must comply with best management practices including: (1) planting holes that are the same depth as the size of the root ball and 2 times wider than the size of the root ball; (2) root balls of potted and balled and burlapped (B &B) plants must be loosened and pruned as necessary to ensure there are no encircling roots prior to planting. At least the top 2/3 of burlap and all straps or wire baskets are to be removed from B &B plants prior to planting; and (3) The top of the root flare, where the roots and the trunk begin, should be about one inch from the surrounding soil. The root ball shall not extend above the soil surface. (4) If using mulch around trees and shrubs, maintain at least a 3 -inch mulch -free ring around the base of the plant trunks and woody stems of shrubs. If using mulch around groundcovers until they become established, mulch shall not be placed over the crowns W: \Long Range Projects \Southcenter Plan \Plan 2011 \Book 2 \FINAL PC BOOK26.12.12with markups.dou Page 52 6/21/2012 56