The two historic buildings-the Reliance Building, built in the 1890s, and the Delaware Building, built in 1870s-both are designated as Chicago Landmarks.
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to provide, install and manage geotechnical and structural instrumentation to monitor the impact of the construction and excavation on the installed slurry and soldier pile and lagging walls and the two subway tunnels as well as two nearby historic buildings and a section of the city’s historic freight tunnel network. Kiewit-Reyes AJV contracted GZA GeoEnvironmental Inc. The proposed link between the Blue Line and the Red Line as well as Block 37 and adjacent buildings. This construction was performed in two very busy street intersections in downtown Chicago.
The work entailed installing slurry walls and soldier pile and lagging walls, constructing deck beams to support roadway plates, and excavating to a depth of approximately 50 feet below street level to allow for the proposed subway connections. and Reyes Group Ltd., to undertake the construction at the two interface sites.
The CTA contracted Kiewit-Reyes AJV, a joint venture of Kiewit Western Co. The Mills Corp.*, the developer of Block 37, would construct the part of the subway link that fell within its project limits, while the City of Chicago and the CTA would construct the station and the interface to the two existing subway lines. The plan was to link the CTA Blue Line to the CTA Red Line in Block 37 situated in the heart of downtown Chicago. In an ambitious undertaking of civil and railway engineering, the Chicago Transit Authority (CTA) in 2006 embarked on a subway tunnel project to allow access between Midway and O’Hare International airports.