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4.3 Plantin9s along Austin Place and Seep Area Street trees will be natives and will be planted in clusters in order to mimic the appearance of the native plantings in the surrounding open space. These plantings will extend to the seep area. A total of 35 trees will be planted in this area. Clusters of native shrubs will also be planted in these areas. Native grassland seed mix will be hydroseeded alongside the road and throughout the clusters of shrub and tree plantings. Invasives are not allowed and exotics are discouraged. See Section 6 for the plant list and Section 3 "Buffer landscape" for further elaboration and appropriate species. 4.4 Bio-retention Area The biD-retention area located at the eastern side of the Lot 1 will capture run-off in order to infiltrate the water on site. The swale will appear dry throughout much of the year, only being wet during rain events. The depressed areas of the basin will be planted with grasses and plants similar to those specified in the "Bio-retention and Seep" plant list. The upper banks of the bio- retention area can be planted with trees and shrubs and hydroseeded with grassland mix. Refer to the plant list for species selection. .. ,,~1: ..: ,'I' , , .j .~II~,IF"'~~,. . ...., " . .~*~ ..i. Left: Typical native grassland-style planting beside sidewalk. By using native grasses, mowing will only be required a few times a year. The area will fit in with the character of the open space, and water-use will be greatly reduced. Right: Bio-retention Basin: showing lower bank wet species and upper bank drier species. Both examples can be found at the Fire Station and Bernal Avenue in Pleasanton. MEADOWLARK PLANNED UNIT DEVELOPMENT DESIGN GUIDELINES Pleasanton, California DRAFT May 2006 p.ll