INTERRA, Inc. is currently providing Quality Assurance testing and inspection services for these Illinois Tollway projects (I-18-4380, I-17-4339). INTERRA is providing side-by-side testing with the Quality Control crew. Responsibilities also include inspection and testing of asphalt, soil, and concrete in the field. For asphalt, INTERRA is performing Quality Assurance split density testing and verifying the temperature results. Other services being performed are testing strips. For concrete testing includes air content, temperature, and slump. For soil the testing consists of nuclear density, compaction, moisture, and Dynamic Cone Penetrometer (DCP) testing to verify the strength and stability of the soil. Work is being done on the embankment. For concrete the work is being performed on the pier columns, pier footings, ramps, pavement, wing walls in addition to many other project components. Cylinder molds are being cast and transported to the INTERRA laboratory located in Bolingbrook.