I-74 and I-155 Interchange

KEG’s responsibilities included transportation and geotechnical services, including pavement marking, permanent signing, traffic signals for two intersections, and subsurface soil and foundation recommendations for pavements and structure foundations.  KEG provided the temporary and permanent erosion control design necessary to accommodate the complex Maintenance of Traffic (MOT) plan that was required to maintain traffic movements during the reconstruction and realignment of the I-74/I-155 interchange.

Pavement coring and signing concepts were provided by KEG early in the planning phases in order to expedite the permanent signing, signals, and pavement markings during plan preparation.  The geotechnical services included over 100 borings and 40 Dynamic Cone Penetrometer tests, as specified by IDOT.  A revised Roadway Geotechnical Report (RGR) for the project was completed by KEG, incorporating subsurface information previously performed by IDOT, in addition to subsurface information obtained to more recent specifications.  The RGR required a detailed subsurface soil profile along the entire alignment based on a combination of the historical and new data.  Additional geotechnical work included two Structural Geotechnical Report Addendums to address issues and/or changes to the structure design since the completion of the original Structural Geotechnical Reports by IDOT and others.  KEG also evaluated the structural impact of temporary embankment fills adjacent to existing bridge support structures during various MOT stages.

The project was on November 2012 letting with construction beginning in the spring of 2013. KEG also assisted with construction engineering during this phase of this project.