Description and Purpose. All cut or filled slopes except slopes not exceeding five feet in vertical height or such graded slopes designated as "Native Slopes" (Section 17.06.132.050) shall be planted with permanent ground cover, adequately interspersed with shrubs and trees to protect the slopes against erosion and shall be irrigated with a permanent sprinkler system to promote and sustain growth of said plantings. (Ord. 3411 § 2 (part); April 1, 1975.)