Sammamish Unified Development Code

Environmentally Critical Areas | Environment & Sustainability

required by a state or federal permit or approval or as otherwise allowed by SDC 21.03.020G., Allowances for existing urban development and other uses.

a) A public agency and utility exception is granted pursuant to SDC 21.03.020H.; b) All requirements of the applicable City-adopted storm water requirements are met; c) The use will not lower the rating or alter the factors used in rating the stream; and d) There are no significant adverse impacts to the stream or habitat. f. Except as provided in subsection 2. of this section, public and private trails may be allowed in stream buffers consistent with the standards and requirements in this chapter, the development standards in SDC 21.07.060, and requirements elsewhere in the SMC. Proposals for constructing viewing platforms, associated access trails, and spur trails must be reviewed by a qualified professional and a critical areas study may be required. g. Crossings. The use of existing crossings, including but not limited to utility corridors, road and railroad rights- of-way across streams or buffers for public or private trails is preferred to new crossings, subject to the standards and requirements in the SMC. New stream crossings may be allowed and may encroach on the otherwise required stream buffer if: i. Bridges, bottomless culverts or other appropriate methods demonstrated to provide fisheries protection shall be used for stream crossings and the applicant shall demonstrate that such methods and their implementation will pose no harm to the

d. Utilities may be allowed in stream buffers if:

i. No reasonable alternative location is available;

ii. The utility corridor meets any additional requirements for installation, replacement of vegetation and maintenance, as needed to mitigate impacts; iii. The requirements for sewer utility corridors in SDC 21.03.020Y.2. shall also apply to streams; and iv. Joint use of an approved sewer utility corridor by other utilities may be allowed. e. Where technically feasible, surface water discharge shall be located outside of the stream and stream buffer. If surface water discharge to a stream or stream buffer is unavoidable, the following management activities and provisions shall apply: i. Surface water discharge to a stream from a flow control or water quality treatment facility, sediment pond or other surface water management activity or facility may be allowed if the discharge is in compliance with the applicable City-adopted storm water requirements. ii. A Type Ns stream buffer may be used as a regional storm water management facility if:

Effective | January 1, 2022

Title 21: Sammamish Development Code | 117

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