Vulcan Materials contracted Drill Tech to build a 12’ diameter by 268’ tunnel, enabling the relocation of a conveyor belt subsurface that constituted a larger reconfiguration of an aggregate mine located in Irwindale, California. Drill Tech constructed the tunnel with an open face digger shield and installed steel ribs and channel lagging for support. This job included the design and construction of both the portal shoring to create access via a permanent soil nail wall totaling 1,000 SF, and a jacking frame to launch the machine using wide flange beams that extended 10’ below surface using micropiles.