(a) General. The face of all cut and fill slopes, in excess of 3 feet in vertical height, but only final slopes of any borrow pit, shall be planted and maintained with a ground cover or other planting to protect the slopes against erosion and instability. Planting shall commence as soon as slopes are completed on any portion of the site and shall be established upon all slopes prior to the final approval of the grading. In order to minimize the period during which a cut or filled surface remains exposed, such planting shall provide for rapid short term coverage of the slope as well as long term permanent coverage. Planting materials and procedures shall conform to regulations adopted by the County Official. Other plant materials as specified by a landscape architect may be approved by the County Official. The permittee shall maintain such planting until it is well established as determined by the County Official, and at least until coverage of 70%, as compared to the native background plants, is achieved.
(b) Minimum Requirements. In addition to planting with ground cover, slopes in excess of fifteen feet in vertical height shall be planted with shrubs having a one gallon minimum size or trees having a five gallon minimum size. The maximum spacing for shrubs and trees shall be ten feet on center each way. The planting pattern, but not the minimum quantity, may be varied upon the recommendation of landscape architect and approval by the County Official.
(Added by Ord. No. 9547 (N.S.), effective 5-9-03)