The consultant’s work consists of preparing an engineering design to construct a single lane roundabout at the intersection of 58th Ave E and Valley Ave E, with the intent of providing traffic calming, safety, and mobility improvements for all travel modes. The roundabout will have an approximately 100-foot inscribed diameter with splitter islands on each approach. The center island will have a mountable apron to accommodate school and transit buses. The scope includes curbs and sidewalks at the intersection, sidewalk segments at intersection approaches, and bike lanes along Valley Ave E through the intersection. Each leg of the intersection will include a marked crosswalk with an island refuge that will allow pedestrians to cross one direction of traffic at a time. The intersection will include additional lighting, and the east and west leg crosswalks on Valley Ave E will include Rectangular Rapid Flashing Beacon (RRFB) systems. Stormwater will need to be considered for National Environmental Protection Act (NEPA) and Pollution Generating Impervious Surface (PGIS) evaluation and may have an impact on the design schedule. Major features include: ▪ Reconfiguring the roadway for multimodal use ▪ ADA and pedestrian improvements ▪ Stormwater improvements ▪ Sanitary sewer manhole adjustments ▪ Water valve adjustments ▪ Lighting improvements ▪ Power and communication infrastructure relocation ▪ Environmental documentation and preparation of permit applications ▪ Utility coordination ▪ Determination of ROW needs, planning, and acquisitions
