(A) Cut slopes shall be no steeper than a two to one (2:1) horizontal to vertical ratio. In special circumstances where no evidence of previous instability exists, and when recommended in the soil engineering report and approved by the City Engineer/Public Works Director, slopes may be constructed to a maximum one and one-half to one (1.5:1) horizontal to vertical ratio. The City Engineer/Public Works Director may require additional slope stability report to support city approval of a steeper slope. In no case shall slopes exceed those specified in any conditions of approval for the development project for which the slope is associated.
(B) A slope stability analysis shall be included in all soil engineering reports for all slopes steeper than a two to one (2:1) horizontal to vertical slope ratio and for all slopes exceeding 20 feet in height regardless of the slope ratio. The soil engineer shall consider slope stability (both gross and surficial stability) and provide a written statement approving the slope stability. In addition, the soil engineer shall recommend alternate methods of construction or compaction requirements necessary for surficial slope stability.
(Ord. 2022-364, passed 11-16-2022)