Primera was selected by the Illinois Department of Transportation to provide Phase II design engineering services for this roadway improvement project. The proposed improvement consisted of the removal of the existing HMA two-lane roadway, existing cross-road culverts, trees, driveways and driveway culverts, and the construction of a new five-lane PCC pavement with a vertical profile which includes combination curb and gutter and a closed drainage system; cross-road culverts, multiple retaining walls; driveways; pavement markings; erosion control; landscaping; temporary traffic signals; and temporary pavements for the maintenance of traffic during construction.
Due to the widening of the roadway, additional right-of-way had to be acquired along the project corridor including property from the Forest Preserve District of Cook County. Where right-of-way could not be acquired, retaining walls were designed to avoid multiple sensitive wetland areas located within the forest preserve property. In addition to the retaining walls, a system of erosion and sediment control was designed to minimize impacts to the sensitive areas.