Summary of Grade Separated Service Roadway A3/A4 at Chicago O'Hare International Airport

This is a Project Description and Scope of Work document for the Chicago Department of Aviation (CDA) regarding the construction of Grade Separated Service Roadway A3/A4 at O'Hare International Airport in Illinois. The project involves the design and construction of a grade-separated service roadway system, including bridge structures, roadway improvements, utilities relocation, and associated site work to support airport operations and enhance vehicular circulation in the A3/A4 terminal area. The project encompasses multiple construction phases with significant earthwork, structural concrete work, pavement installation, and utility coordination requirements across the airport's operational environment.

The project is funded through O'Hare Modernization Program capital improvement sources, with construction activities requiring coordination with active airport operations and adherence to Federal Aviation Administration (FAA) standards and Chicago municipal requirements. The scope includes temporary traffic control, environmental compliance, stormwater management, and phased construction sequencing to minimize disruption to airport activities. Contractor selection will be based on qualifications, experience with airport construction projects, safety protocols, and ability to work within an active commercial aviation environment. The project timeline reflects the complexities of construction at a major international hub airport, with specific coordination requirements for equipment staging, material delivery, and work scheduling around flight operations and passenger services.