The project includes the construction of a roundabout at the US Route 20 at Marengo Road, Beck Road and South Union Road intersection utilizing staged construction. Work includes pavement widening to accommodate new turn lanes along US Route 20 at Coral Road and West Union Road, replacement of a culvert with three precast concrete box culverts flanked by two new MSE retaining walls, extension of a culvert to accommodate the widened shoulder on US Route 20, lighting, new curbs, gutters, sidewalk, resurfacing, and drainage work.
As a subconsultant to DLZ Illinois, Inc., INTERRA provides Materials Coordination Assistance and Quality Assurance Materials Testing, services as requested for the IDOT contract. The Quality Assurance services include soil, concrete, and asphalt. INTERRA is completing compaction services on the embankment and collecting samples. The Dynamic Cone Penetrometer (DCP) test is being completed to verify the strength and stability of the soil. The subgrade is also being inspected and proof rolls are being conducted. For asphalt and concrete, testing and inspection services are being performed in the field. Soil testing is being performed in accordance with the Embankment I specifications and contract special provisions. The bearing capacity for the foundation soil for the box culvert are also being verified per the plans. Quality Assurance testing is being performed on cast-in-place concrete items on the jobsite which includes split sample testing with QC for slump, air content, and casting cylinders. The mainline hot mix asphalt (HMA) was Quality Control for Performance (QCP). During QCP production, the plant, field, and laboratory inspection was performed at the random locations determined by INTERRA.
The sampling per the random locations are being monitored and witnessed by INTERRA. Daily field inspections and testing are being performed on the lay down of the tack coat material prior to the start of the paving operations. The BDE special provisions are being followed to determine the specifications and tolerances. The random locations for the cores are also determined and indicated to the QC after each placement of the QCP mixes. The HMA samples and cores are being obtained for each sublot (including dispute samples), bagged, tagged (with IDOT provided tags) and are being transported to the INTERRA laboratory in Bolingbrook. Any issues are being reported to the Resident Engineer and IDOT personnel immediately and resolved on the jobsite to avoid any job delays. Coordination of all QCP was done by INTERRA who is communicating with the Quality Control personnel to ensure the job went smoothly and all QCP requirements were met.