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34. How will noise be mitigated after construction of the Steptoe Street Extension?
Construction of Steptoe Street will increase the ambient noise levels in the area. A study is being prepared to identify the level of noise that can be expected at the property line and at the back porch line of the residential housing located along the existing right-of-way. Once completed, this study will be added to the Project Features section on the website.
Based on the comments received from the Neighborhood Meetings, the website, and the telephone information line, noise impacts are a primary issue for the adjacent neighborhoods. The planning study includes research of cost effective mitigation measures that can be incorporated into the project design. Measures which will be considered include, but are not limited to: depression of the roadway; construction of masonry walls at the property lines, landscaping adjacent to the masonry walls and between the roadway curb line and the pedestrian sidewalk; and other options that may be identified as the project moves forward.
The placement of masonry walls and the depression of the travel surface of the roadway may be restricted by the existing right-of-way corridor. Maintaining a maximum slope of 3:1 in landscaped areas is necessary, and, coupled with the difference in elevation between Kennewick Park and Meadow Springs and a minimum setback at the right-of-way line to avoid encroachment on private property, will limit the depression of the roadway to 1 to 3 feet below the existing ground elevations. To reduce visual impacts, the height of the masonry wall may be limited to a height of 6-feet at the existing property line.
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