Sammamish Unified Development Code

Environment & Sustainability | Environmentally Critical Areas

been mapped shall be clearly identified and labeled on the site plans. The site plans shall be attached to the notice on title required by SDC 21.03.020S.

i. Construction outside of this seasonal development limitation may be authorized if the director determines that the hazard area will not be adversely impacted by the proposed construction work or the applicant demonstrates that erosion hazards will be fully mitigated through a temporary erosion and sediment control management plan that includes: a) The minimum requirements from the adopted surface water design manual and SDC 21.03.050, Surface Water Management: 1) Provisions to store site construction runoff and treat runoff sufficiently to meet water quality standards prior to discharge; 2) Daily and post-storm inspections of temporary erosion and sediment control best management practices; 3) Establishment of a manager, who is a Certified Erosion and Sediment Control Lead (CESCL) in the state of Washington, and will be available on call to respond to temporary erosion and sediment control noncompliance; 4) A water-quality monitoring plan for site discharges, where the applicant is responsible

U. Alteration

Recodified to SDC 21.04.040B.12. by Ord. O2005-172.

V. Building setbacks

Unless otherwise provided, buildings and other structures shall be set back a distance of 15 feet from the edges of a critical area buffer. The following may be allowed in the building setback area:

1. Landscaping;

2. Uncovered decks, less than 18 inches above grade;

3. Building overhangs if such overhangs do not extend more than 18 inches into the setback area; 4. Impervious ground surfaces, such as driveways and patios; provided, that such improvements may be subject to special drainage provisions adopted for the various critical areas; and

5. Trails.

W. Erosion, flood, landslide, and seismic hazard areas

1. Erosion hazard areas – Development standards and permitted alterations a. Land clearing, grading, filling, and foundation work in an erosion hazard area is allowed only from May 1st to September 30th, except that:

for measuring turbidity of storm water released from the site and maintaining records of monitoring data that shall be available upon request by the City or Ecology. Monitoring protocols shall conform to the

78 | Title 21: Sammamish Development Code

Effective | January 1, 2022

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