Environmentally Critical Areas | Environment & Sustainability
design must follow mitigation sequencing as outlined in SDC 21.03.020M. and achieve no net loss of ecological functions; and any authorized alteration of a critical area under this subsection shall be subject to conditions established by the department including, but not limited to, mitigation under an approved mitigation plan. v. The lack of a reasonable economic use alternative is not the result of actions taken by the applicant after December 31, 2021. b. The following must be submitted with a request for a reasonable use exception: i. A critical area report from a qualified professional detailing how the project has been designed to avoid and minimize impacts to the critical area and buffer. The report shall detail the anticipated impact on the critical area and buffer along with specific mitigation measures that may include restoration of previously impacted critical area. ii. A site plan showing the critical area, buffer, natural features, topography, and proposed development area. iii. A proposed monitoring plan for a minimum of five years including submittal of an annual report the City outlining how proposed mitigation measures are functioning such as plantings. iv. The applicant shall submit a detailed review of the permitted uses allowed in the underlying zoning district with supporting information explaining why
all other permitted uses that may have less impact on the critical area and buffer are not feasible.
c. Development Limitations in R- zones.
In the R- zones where no other permitted uses allow for reasonable use of the property the City may allow up to a 2,250 square foot single-family home inclusive of accessory structures. Maximum developable area may not exceed 2,500 square feet inclusive of all structures and impervious surfaces, pursuant to an approved RUE, with applicable mitigation.
Critical areas maps and inventories
I.
Not all of the critical areas in the City of Sammamish are fully mapped. Field verification and, if appropriate, evaluation and mapping by a qualified professional of the location of critical areas will be required. The distribution of many environmentally critical areas in the City of Sammamish is displayed in the City’s critical areas map folio, as amended. Additionally, the following maps are referenced and/or maintained by the City: 1. Many of the wetlands located within the City’s boundaries are inventoried in the King County wetlands inventory notebooks. 2. Flood hazard areas are mapped by the Federal Insurance Administration in a scientific and engineering report entitled “The Flood Insurance Study for King County.” 3. The wetland management, erosion hazard near sensitive water bodies, critical aquifer recharge area, and lake management special overlay districts are designated on
Effective | January 1, 2022
Title 21: Sammamish Development Code | 69
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