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Draft Chapter 18.28 Tukwila Urban Center (TUC) District <br />l I <br />Comment [NG10]; Covered by 18.28.260 D 4 a <br /><e- s "rub.s. -_:sv'J +.0 sv.:" N3rldn, I°ts 11c..,a st." t f..3.. g—S. <br />Rooftop Parking Landscape Alternatives. <br />a. Landscape Planters <br />(1) For a parking area on the top level of a parking structure, one planter that is 30 inches <br />deep and 5 feet square should be provided for every 10 parking stalls on the top level of <br />the structure. <br />(2) Each planter should contain a small tree or large shrub suited to the size of the container <br />and the specific site conditions, including dessicating winds. <br />(3) The planter should be clustered with other planters near driving ramps or stairways to <br />maximize visual effect. <br />(4) Only non flammable mulch such as gravel should be used. <br />b. Rooftop Garden or Green Roof. An onsite rooftop area, equal in size to a minimum of 5 square <br />feet of landscaping per each top level parking stall, may be covered with vegetation and soil, or <br />a growing medium, planted over a waterproofing membrane. <br />c. Terraced planters. Upper levels of parking structures can be stepped back and incorporate <br />irrigated terraced planters, equal in size to a minimum of 5 square feet of landscaping per each <br />top level parking stall. <br />d. Green Wall. The fagade of the parking structure may be trellised and planted with vines or <br />have an irrigated green wall system installed to provide a minimum of 5 square feet of <br />landscaping per each top level parking stall. <br />B. Loading Zones <br />1. Loading zones should be separated from customer and occupant pedestrian areas. <br />C. Bicycle Parking <br />1. General Standards <br />a. Racks should be oriented to maximize their efficiency and aligned to keep obstructions away <br />from pedestrian thoroughfares. <br />b. Clustered arrangements of racks should be set back from walls or street furniture to allow bikes <br />to be parked at both ends or from either side. <br />c. Where more than one rack is installed, the minimum separation between aisles should be 48 <br />inches (the aisle is measured from tip to tip of bike tires across the space between racks). This <br />provides enough space for one person to walk one bike. In high traffic areas where many users <br />W: \Long Range Projects \Southcenter Plan \Plan 2011 \Book 2 \FINAL PC BOOK26.12.12with markups.dou Page 71 6/21/2012 <br />75 <br />