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I-70 Twin Tunnels Rock Excavation


For the widening of the westbound lanes of I-70 at the Twin Tunnels, Harrison Western excavated 50,000 CY of rock with careful and calculated drilling and blasting. The work was limited to a maximum of four blasts per day. After blasting, HW installed 74,000 SF of rock fall mesh, 34 grouted anchors, 1,350 LF of grouted dowels, and 450 LF of tensioned rock bolts for permanent highwall stability.