Environment & Sustainability | Environmentally Critical Areas
i. A landslide hazard area located on a slope 40 percent or steeper may be altered only if the alteration meets the following standards and limitations:
roads, driveways or trails, or where erosion and landsliding threaten any lake, stream, wetland, or shoreline. Stabilization work shall be performed in a manner that causes the least possible disturbance to the slope and its vegetative cover; and f) Reconstruction, remodeling, or replacement of an existing structure upon another portion of an existing impervious surface that was established pursuant to City ordinances and regulations may be allowed; provided: 1) If within the buffer, the structure is located no closer to the landslide hazard area than the existing structure; and 2) The existing impervious surface within the buffer or landslide hazard area is not expanded as a result of the reconstruction or replacement. ii. A landslide hazard area located on a slope less than 40 percent may be altered only if the alteration meets the following requirements:
a) Approved surface water conveyances, as specified in the adopted surface water design manual and SDC 21.03.050, Surface Water Management, may be allowed in a landslide hazard area if they are installed in a manner to minimize disturbance to the slope and vegetation; b) Public and private trails may be allowed in a landslide hazard area subject to the standards and mitigations contained in this chapter, development standards in SDC 21.07.060, and requirements elsewhere in the SMC, when locating outside of the hazard area is not feasible; c) Utility corridors may be allowed in a landslide hazard area if a critical areas study shows that such alteration will not subject the area to the risk of landslide or erosion; d) Limited trimming and pruning of vegetation may be allowed in a landslide hazard area pursuant to an approved vegetation management plan for the creation and maintenance of views if the soils are not disturbed; e) Stabilization of sites where erosion or landsliding threatens public or private structures, utilities,
a) The development proposal will not decrease slope stability on contiguous properties; and
b) Mitigation based on the best available engineering and geological practices is
implemented that either eliminates or minimizes the risk of damage, death, or injury resulting from landslides.
86 | Title 21: Sammamish Development Code
Effective | January 1, 2022
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