A durable corrosion-resistant sewage tunnel was planned to be constructed similar to the "San Ramon Valley Improvement Project" in Walnut Creek near San Francisco. The EPB2400TB that successfully had accomplished the mission in Walnut Creek was now to be used in Orange County, Los Angeles. The plan was to drive the "Ellis Avenue Trunk Sewer" in Los Angeles, an approx. 1,600-meters-long tunnel with a diameter of three meters and several tight bends with radii of only 150 meters. After completion of the rib and lagging works, a steel pipe with a diameter of 66 inches was installed in the tunnel.