Where reasonable and practicable, all development will be designed in a manner which maintains existing natural features and grade, preserves the full use of neighboring properties (i.e., existing and potential structures, parking pads, driveways, roads, etc.), significant trees and/or other landscape features, and restores features damaged during development consistent with Comprehensive Plan Policies EE 9.5.4 and EE 9.6.1 through EE 9.6.5. The following standards will be considered:
A. Retaining Walls.
1. All retaining walls over four feet in height (bottom of foundation to top of wall) must be designed by an engineer licensed to conduct business in Washington State.
2. All retaining walls regardless of height that are influenced by a surcharge load must be designed by an engineer licensed to conduct business in Washington State. Surcharge load can be due to adjacent structures, vehicles, or sloping backfill within H feet of the back of wall, where "H" is the height of the wall. The design must address the surcharge required to account for the full use of the adjacent property as shown in Figure 18.82.090C.
3. Retaining wall design, regardless of height, must consider the topography, neighboring property, and full uses of the neighboring property.
4. All retaining wall designs must include a site plan which shows:
a. The entire lot, existing and proposed contours, the proposed retaining wall, all slopes, all proposed and existing utilities, all known easements, and all existing and proposed natural features and other structures.
b. Evidence that efforts were made to preserve natural grades and significant natural features found on site must be incorporated into the overall design of the project.
B. Existing significant individual trees and groups of trees should be preserved, where possible.
C. The disturbance of required open space areas should be minimized during development and restored before project completion.
(Ord. 97-019 § 4 (Exh. B); Ord. 2022-029 § 2 (Exh. B), 2022)