Environment & Sustainability | Environmentally Critical Areas
provide water quality monitoring reports to the City consistent with SDC 21.03.020W.1.a)4), and shall include monitoring of water temperature. v. The director may halt wet season construction as necessary to protect the hazard area and/or to prevent downstream impacts. b. All development proposals on sites containing erosion hazard areas shall include a temporary erosion and sediment control plan as specified in subsection 1.a. of this section consistent with this section and other laws and regulations prior to receiving approval. Specific requirements for such plans shall be set forth in the adopted surface water design manual and SDC 21.03.050, Surface Water Management, or as otherwise specified by the department. c. All subdivisions, short subdivisions, or binding site plans on sites with erosion hazard areas shall comply with the following additional requirements: i. Existing vegetation shall be retained on all lots until building permits are approved for development on individual lots; ii. If any vegetation on the lots is damaged or removed during construction of the subdivision infrastructure, the applicant shall be required to submit a restoration plan to the department for review and approval. Following approval, the applicant shall be required to implement the plan; iii. Where the City determines that erosion from a development site poses a significant risk of damage
to downstream receiving waters, based either on the size of the project, the proximity to the receiving water or the sensitivity of the receiving water, the applicant shall be required to provide regular monitoring of surface water discharge from the site as required by the adopted surface water design manual and City of Sammamish addendum. If the project does not meet the applicable provisions of the adopted water quality standards as established by law, the City may suspend further development work on the site until such standards are met. d. The use of hazardous substances, pesticides, and fertilizers in erosion hazard areas may be prohibited by the City.
2. Erosion Hazards Near Sensitive Water Bodies Overlay
a. The purpose of the erosion hazards near sensitive water bodies overlay is to provide a means to designate sloped areas posing erosion hazards that drain directly to lakes or streams of high resource value that are particularly sensitive to the impacts of increased erosion and the resulting sediment loads from development.
b. General Development Standards
The following development standards shall be applied to all properties within the erosion hazard near sensitive water body overlay: i. The one-acre exemption in the storm water design manual addendum shall not apply within the erosion hazards near sensitive water body overlay.
80 | Title 21: Sammamish Development Code
Effective | January 1, 2022
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