Environment & Sustainability | Environmentally Critical Areas
3. Streams – Mitigation requirements
iii. Off-site locations have been identified and evaluated in the following order of preference:
When mitigation for stream or stream buffer impacts is required, mitigation shall meet the requirements listed in SDC 21.03.020O. in addition to the following supplementary requirements: a. Equivalent or Greater Functions. Mitigation for alterations to stream(s) and/or stream buffer(s) shall achieve equivalent or greater functions including, but not limited to: i. Habitat complexity, connectivity, and other biological functions; ii. Seasonal hydrological dynamics, water storage capacity and water quality; and
a) Within the same drainage sub-basin;
b) Within the City limits;
c) Within the Sammamish service area for an approved fee-in-lieu or mitigation bank program sites within the City limits in accordance with the provisions of this section; d) Within the Sammamish service area for an approved fee-in-lieu or mitigation bank program sites within the WRIA 8 in accordance with the provisions of this section. c. Fee-In-Lieu Stream Mitigation Program. Fee-in-lieu mitigation may be authorized for approved stream impacts; provided, that the impact is related to the approval of a single-family home, City of Sammamish capital improvement project, or development proposal within the Town Center. Fee-in-lieu mitigation shall be subject to the avoidance sequence requirements and mitigation measures of this title, and the approval of a program by the City, to be used in the following order of preference: i. A City approved program that utilizes receiving mitigation sites within the same sub-basin as the approved wetland impact. ii. The King County mitigation reserves program, or other approved program that gives priority to sites within the same sub-basin.
iii. Geomorphic and habitat processes and functions.
b. Mitigation Type and Location. Mitigation actions shall be in-kind and conducted within the same sub-basin and on the same site as the alteration, except when the following apply: i. There are no reasonable on-site opportunities for mitigation or on-site opportunities do not have a high likelihood of success due to development pressures, adjacent land uses, or on-site buffers or connectivity are inadequate; ii. Off-site mitigation has a greater likelihood of providing equal or improved functions than the impacted stream; and
120 | Title 21: Sammamish Development Code
Effective | January 1, 2022
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