This project involves widening the North Aurora Road underpass under the Wisconsin Central Ltd. (WCL) and Burlington Northern and Santa Fe (BNSF) Railways. The work consists of pavement removal; curb and gutter removal and replacement; roadway reconstruction, including pavement widening, channelization, sidewalk and multiuse path; grading; storm sewer and drainage structure adjustments and installation; stormwater detention culverts; pump station; maintenance of traffic; erosion control; landscaping; pavement markings; retaining wall; railroad shoofly; railroad bridge; utility coordination, relocation and adjustments; and all incidental and collateral work as necessary to complete the improvement shown herein and as described in the specifications.