DB Sterlin provided structural and civil engineering services for the Phase II design of the proposed bridge flyover and associated improvements. Civil engineering services included existing utility base mapping, utility coordination, and the City of Chicago permitting coordination. Utility coordination efforts included the creation of existing utility conflict exhibits and coordinating with the affected utilities for required temporary or permanent relocations or protection measures, including Chicago Department of Water Management (CDWM) Water and Sewer, CDOT Division of Electrical Operations (DEO), ComEd, Peoples Gas, MCI/Verizon, and Crown Castle. DB Sterling was also tasked with assisting with permitting submittals and coordination for City of Chicago permits including coordinating with City of Chicago Department of Buildings Stormwater Reviewers, Office of Underground Coordination (OUC) Existing Facilities Protection (EFP), CDOT Deep Excavation submittals, CDOT Permit Coordination Office (PCO) for MOT and Detours, and BACP for Grant of Privilege permits. Other DB Sterlin assignments included structural engineering design for proposed retaining walls.
The improvements included new elevated rail crossings on fill at 74th Street, 73rd Street, and 72nd Street, a new bridge structure over 71st Street, and partial reconstruction of the existing bridge structure at 69th Street. The project also included lowering the pavement on 71st Street to provide adequate clearance for the new bridge structure.