Town Center | Development Standards—Landscaping and Irrigation
b. Twenty-five square feet per parking stall when 31 or more parking stalls are provided; 3. Trees shall be provided and distributed throughout the parking area at a rate of: a. One tree for every five parking stalls for a commercial or industrial development; and b. One tree for every 10 parking stalls for residential or institutional development; 4. The maximum distance between any parking stall and landscaping shall be no more than 100 feet;
e. At least 70 percent of trees are deciduous; and
8. Landscaped areas serve as stormwater treatment facilities.
F. Landscaping – General standards for all landscape areas
All new landscape areas proposed for a development shall be subject to the following provisions: 1. Berms shall not exceed a slope of two horizontal feet to one vertical foot (2:1). 2. All new turf areas, except all-weather, sand-based athletic fields, shall: a. Be augmented with a two-inch layer of stabilized compost material or a four-inch layer of organic material with a minimum of eight percent organic material cultivated a minimum of eight inches deep; or b. Have an existing organic content of eight percent or more to a depth of six inches as shown in a soil sample analysis. The soil analysis shall include: i. Determination of soil texture, indicating percentage of organic matter; ii. An approximated soil infiltration rate (either measured or derived from soil/texture/infiltration rate tables). A range of infiltration rates shall be noted where appropriate; and
5. Pavers shall provide pedestrian access adjacent to planters;
6. Permanent curbs or structural barriers shall be provided to protect the plantings from vehicle overhang and curb cuts shall be provided in these barriers to allow surface water to flow into landscaped areas;
7. Parking area landscaping shall consist of:
a. Canopy-type deciduous trees, evergreen trees, evergreen shrubs, perennials, and groundcovers planted in islands or strips; b. Shrubs planted at a rate of one per 20 square feet of landscaped area and maintained at a height of no more than 42 inches; c. Plantings contained in planting islands or strips having an area of at least 100 square feet and with a narrow dimension of no less than five feet;
iii. Measure pH value.
3. Landscape areas, except turf or areas of established groundcover, shall be covered with at least two inches of stabilized compost to minimize evaporation.
d. Groundcover pursuant to SDC 21.07.070G.; and
514 | Title 21: Sammamish Development Code
Effective | January 1, 2022
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