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PROJECT WIDE GUIDELINES AND STAND STOCKTON METROPOLrrAN AIRPORT - SPECIAL PURPOSE PLAN Trees 13 In developed areas of the project,trees will not in locations where screening is desired. • p Q be treated in an architectonic or formal manner,to define and articulate space as Colorful vines will be used on buildings,tre!- walls,canopies and edges. lis walls and structures where feasible. Trees willg enerally be single-trunked when Bird attracting flowering shrubs will be care- used in geometrical plantings. Multiple fully selected so that flowering species are 0 trunks will be reserved for accents and less not located where they must be kept formal situations. clipped,thus losing their flowers. Flowering trees will be used to accent build- Shrubs and vines will be grouped with Q • ing entries and project gateways. species having similar watering requirements. E3 • Where trees occur in paved areas,they will E3 be provided with large tree wells and root Ground Covers and Perennials 13 barriers. • These will be selected and located so as not Ea • Sub-drains will be used where drainage to encroach on walkways and paths. 13 might be a problem. • Ground covers will be located and used • Tree wells may be covered with decorative functionally and consistently throughout. metal grates or planted with ground covers with seasonal color. 0Shrubbier,informal species of plants that serve as a barrier will be used where foot 0 • Trees will be carefully selected for uniformi- traffic is discouraged. ty of structure,color and appearance prior to planting. aFiner,textured or more decorative species will be used near walkways, building entries • Trees will be selected to respond to con- and ground level windows. terns of wind,soils,views,solar orientation, 13 drought tolerance and maintenance consid- Aggressive ground covers will not be planted eration. under shrubs. El Shrubs and Vines 0One gallon spreading ground covers will be used to enable the use of drip irrigation. • They will be planted in large significant masses. The appropriate use of single Lawn accents will be encouraged. • Lawns will generally be kept free of shrubs. • Shrub masses will have good drainage and appropriate maintenance considerations. 0 Lawns should be separated from wap and building surfaces by shrub and ground cover • Species with striking forms will be displayed beds. against wags and in highly visible locations, • Draught tolerant grasses will be used. � III. 4-28 OPEN SPACE, LANDSCAPE AND STREETSCAPES C