Sammamish Unified Development Code

Environmentally Critical Areas | Environment & Sustainability

iii. A City approved program, the King County mitigation reserves program, or other approved program that gives priority to sites that will expand or improve habitat for Lake Sammamish Kokanee. iv. The King County mitigation reserves program, or other approved program that gives priority to sites within the same sub-basin and/or a predefined service area that includes the City of Sammamish. d. Mitigation Timing. Where feasible, mitigation projects shall be completed prior to activities that will disturb streams. In all other cases, mitigation shall be completed immediately following disturbance and prior to use or occupancy of the activity or development. Construction of mitigation projects shall be timed to reduce impacts to existing wildlife and flora. e. Restoration Required. Restoration shall be required when a stream or its buffer is altered in violation of law or without any specific permission or approval by the City. A mitigation plan for restoration shall conform to the requirements of this chapter and demonstrate that: i. The restoration will reliably and demonstrably improve the water quality and fish and wildlife habitat of the stream;

f. Surface water management or flood control alterations shall not be considered enhancement unless other functions are simultaneously improved.

4. Ponds – Development standards


5. Lake Sammamish buffer – Permitted alterations


6. Lake management areas – Special district overlay

a. The purpose of lake management areas is to designate the Beaver Lake and Pine Lake watersheds as special management areas for total phosphorus loading control and to establish standard procedures for evaluating drainage plans and related materials for applications of development within the Beaver Lake and Pine Lake Watersheds (within the East Lake Sammamish drainage basin). b. The lake management areas special overlay district shall be designated on critical areas maps maintained by the department of community development. c. The Beaver Lake watershed as generally identified in the Beaver Lake management plan, which is available at the City of Sammamish community development department, is a sensitive lake and is hereby designated a critical drainage area. This designation is: i. Existing whole-lake total phosphorus concentration for the combined Beaver Lake system is 23 micrograms/liter. Beaver Lake 1 and Beaver Lake

ii. The restoration will have no lasting significant adverse impact on any stream functions; and

iii. On sites where nonnative vegetation was cleared, restoration shall include installation of native vegetation with a density equal to or greater than the pre-altered site conditions.

Effective | January 1, 2022

Title 21: Sammamish Development Code | 121

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