Development in the R 5,400a, OP area shall install a minimum 30-foot-wide Type I landscape buffer to mitigate noise and visual impacts on abutting residential development. Such buffering shall include but not be limited to such techniques and materials as fences, walls, berms, and screening type plant materials. (Ord. 2171 § 3 (Exh. C), 2015; Ord. 1948 § 2, 2005; Ord. 1946 § 2, 2005; Ord. 1815 § 1, 2000; Ord. 1629 § 1, 1996. Formerly 12.46.070).