Thornton I.C. involves closing several intersections, building cul-de-sacs, access roads along US-20 rebuilding parts of US-20 and construction of a new interchange structure. Which will also include dirt work and crushing aggregates for the project. 75,184 Cubic Yards of Excavation. 442,585 Cubic Yards of Granular Borrow. 73,440 Cubic Yards of 3/4" Base. 42,500 Tons of Asphalt Paving.