Environment & Sustainability | Low Impact Development
i. For lots of 4,000 square feet or less, a minimum of two trees planted per lot; ii. For lots greater than 4,000 square feet in area, a minimum of two trees plus one additional tree planted per 1,000 square feet over 4,000 square feet; iii. 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.
iii. Each lot total impervious surface is 15 percent less than the applicable maximum allowable impervious surface area: nine technique points. iv. Each lot total impervious surface is 20 percent less than the applicable maximum allowable impervious surface area: 12 technique points; c. Impervious surface areas which are public roads or public sidewalks shall be excluded from the calculation of the site’s total impervious surface area hereunder; and d. The allowed increases in the maximum permitted impervious surface area for smaller lots pursuant to SDC 21.04.030.C and SDC 21.04.030D. shall not apply to this subsection.
7. Reduced Impervious Surface – Up to 12 Technique Points.
a. Lots created through a development proposal shall qualify for points under this subsection if each lot’s total impervious surface area is less than the applicable maximum allowable impervious surface area pursuant to SDC 21.04.030.C or SDC 21.04.030D., as applicable and after meeting maximum impervious surface standards in accordance with the adopted Surface Water Design Manual;
8. Minimal Foundation Excavation – 12 Technique Points.
a. All of the structures within a residential development shall be designed with minimal foundation excavation which shall include: i. Limited or no disturbance of the natural soil profile within the footprint of all proposed structures. “Limited disturbance” shall have the meaning set forth in subsection 5. of this section; ii. Using a foundation that consists of a combination of driven piles and a connection at or above the existing grade of the subject site. b. Compliance with this technique shall require review and approval by the building official.
b. Technique points shall be awarded for reduced impervious surface as follows:
i. Each lot total impervious surface is five percent less than the applicable maximum allowable impervious surface area: three technique points. ii. Each lot total impervious surface is 10 percent less than the applicable maximum allowable impervious surface area: six technique points.
128 | Title 21: Sammamish Development Code
Effective | January 1, 2022
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