Sound attenuation improvements shall include all reasonable and feasible measures necessary to meet the required standard including the construction of Freeway walls and earthen berms. If there are special characteristics within a Freeway corridor, such as the topography of the area, drainage, maintenance requirements, or safety considerations, as determined by the City Engineer, or his or her designee, then the construction of a noise barrier of greater than 20 feet in height should be avoided. Reasonable and feasible measures may include, without limitation, achieving a noise reduction of at least 5 dBA, barrier height, aesthetic issues relating to a proposed barrier, or such other measures as consistent with the ADOT (Arizona Department of Transportation) Noise Abatement Requirements (May 2017, as may be amended) and approved by the City Engineer, or his or her designee. The sound attenuation measures shall utilize designs that minimize the visual impact on the site with appropriate use of colors and materials. Any landscape plan proposed for any site subject to the Freeway development standards whereby a wall or berm is required shall include, where appropriate, visual mitigation measures, such as colors, materials, styles, designs, or additional landscape treatments to minimize the visual impacts of walls or berms. (Am. Ord. 23-1589, passed 9-25-23)