20.25H.080 Performance standards.
A. General. Development on sites with a type S or F stream or associated critical area buffer shall incorporate the following performance standards in design of the development, as applicable:
1. Lights shall be directed away from the stream.
2. Activity that generates noise such as parking lots, generators, and residential uses shall be located away from the stream or any noise shall be minimized through use of design and insulation techniques.
3. Toxic runoff from new impervious area shall be routed away from the stream.
4. Treated water may be allowed to enter the stream critical area buffer.
5. The outer edge of the stream critical area buffer shall be planted with dense vegetation to limit pet or human use.
6. Use of pesticides, insecticides and fertilizers within 150 feet of the edge of the stream critical area buffer shall be in accordance with the City of Bellevue’s “Environmental Best Management Practices,” now or as hereafter amended.
7. All applicable standards of Chapter 24.06 BCC, Storm and Surface Water Utility Code, are met.
B. Modification of Stream Channel.
1. When Allowed. A stream channel shall not be modified by relocating the open channel, or by closing the channel through pipes or culverts unless in connection with the following uses allowed under LUC 20.25H.055:
a. A new or expanded utility facility or system;
b. A new or expanded essential public facility;
c. Public flood control measures;
d. In-stream structures;
e. New or expanded public right-of-way, private roads, access easements or driveways;
f. Habitat improvement project; or
g. Reasonable use exception; provided, that a modification may be allowed under this section for a reasonable use exception only where the applicant demonstrates that no other alternative exists to achieve the allowed development.
A critical areas report may not be used to modify the uses set forth in this subsection B.1.
2. Critical Areas Report Required. Any proposal to modify a stream channel under this section may be approved only through a critical areas report.
3. Relocation of Closed Stream Channel. Any proposal to relocate an existing closed stream channel may be approved only through a critical areas report. (Ord. 6417, 5-21-18, § 32; Ord. 6323, 11-21-16, § 15; Ord. 5680, 6-26-06, § 3)