Development Standards—Design Requirements | Town Center
with AASHTO standards for public multi-use paved trails (Guide for the Development of Bicycle Facilities, 1999, as amended, American Association of State Highway and Transportation Officials), and with U.S. Forest Service standards (Trails Management Handbook, 1991, as amended, and Standard Specifications for Construction of Trails Handbook, 1984, as amended) if unpaved. Cleared areas shall be the minimum necessary consistent with the standards and requirements in the SMC. e. Sensitive Areas and Buffers. Trail impacts to sensitive areas should be reviewed consistent with the impact avoidance and mitigation sequencing requirements of SDC 21.03.020. Mitigation of impacts is required, even for trails located on existing corridors consistent with subsection 2. of this section. Wetland and stream buffers shall be expanded to compensate for the total area of the trail corridor, including all disturbed areas located within the buffer area. No expansion shall be required for trails located on existing improved corridors, including but not limited to utility corridors, road or railroad rights-of-way, within wetland or stream buffers. Mitigation shall be required for all impacts consistent with SDC 21.03.020. f. Location. Except for approved viewing platforms, spur trails, wetland or stream crossings proposed consistent with SDC 21.03.020, or trails located on existing corridors consistent with subsection 2. of this section, trails that are proposed in proximity to wetlands or streams or associated buffers may only be located in the outer 25 percent of the wetland or stream buffer
and should be generally aligned parallel to the stream or perimeter of the wetland. Spur trails and viewing structures should be designed to minimize impacts on sensitive area and wildlife habitat. Viewing platforms shall be placed landward of the wetland or stream edge. g. Wildlife. Trails should be designed and constructed to encourage users to remain on the trail through the use of fencing, signage, landscaping or other appropriate means to minimize impacts to wildlife and habitat. In addition to the requirements related to wildlife corridors elsewhere in the SMC, trail location, lighting, construction decisions, and requirements for use (e.g., pet leash requirements, bicycle speed limits, etc. should be guided by recommendations from sensitive areas studies to avoid, minimize and mitigate impacts to habitat for sensitive species. In a vegetation management plan developed for City review and approval consistent with SDC 21.03.020Q., all disturbed areas shall be landscaped with appropriate native vegetation upon completion of trail construction or as soon thereafter as possible. The trail maintenance entity shall ensure that such vegetation survives through an appropriate mechanism. An integrated vegetation and pest management plan shall be developed by the applicant and approved by the department that avoids or minimizes the use of pesticides, herbicides and other hazardous substances. h. Surfacing. The director will determine pavement options for the specific trail section. To promote infiltration and groundwater recharge and to minimize slope instability, trail surfaces shall be made of pervious materials unless
Effective | January 1, 2022
Title 21: Sammamish Development Code | 485
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