Environment & Sustainability | Low Impact Development
iii. The plantings shall provide a multilayer canopy of large trees (50 percent), small trees, shrubs, and ground cover at maturity; iv. A minimum of 75 percent of the open space tract shall be planted with trees, shrubs and groundcover. Groundcover does not include pasture or turf;
xiii. Significant trees retained in an open space tract may also be counted towards total tree retention requirements for the parcel. 3. Restoration of Critical Area Buffers – Up to 20 Technique Points. a. The applicant may earn up to 20 technique points for restoring up to 50 percent of the critical area buffers within a development site. b. Technique points shall be awarded for restoration as follows: i. Restoration of 10 percent of vegetated area: four technique points. ii. Restoration of 20 percent of vegetated area: eight technique points. iii. Restoration of 30 percent of vegetated area: 12 technique points. iv. Restoration of 40 percent of vegetated area: 16 technique points.
v. All invasive plants on the site shall be removed;
vi. No more than 15 percent of the proposed open space tract shall be pasture or turf; vii. Plants shall be selected by a licensed professional based upon site suitability; viii. For proposed open space tracts exceeding one- half acre in area, a ratio of two evergreens to one deciduous tree is required; ix. Three trees shall be planted per 1,000 square feet of proposed open space tract area; x. Trees shall be native to the coastal Pacific Northwest. On planting, deciduous trees shall have a minimum caliper of three-quarters inch and coniferous and broadleaf evergreen trees shall be at least five feet in height; xi. Eighty percent of shrubs and 80 percent of groundcover shall be species native to the coastal Pacific Northwest; xii. Shrubs shall be spaced a maximum of four feet on center and ground cover shall be spaced a maximum of two feet on center; and
v. Restoration of 50 percent of vegetated area: 20 technique points.
c. Restoration of critical area buffers shall be subject to mitigation standards in accordance with SDC 21.03.020 and the maintenance and irrigation requirements of SDC 21.06.020H. throughSDC 21.06.020J.2.
4. Increased Width of Critical Area Buffer – 10 Technique Points.
126 | Title 21: Sammamish Development Code
Effective | January 1, 2022
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