The Frontier-Kemper/Tutor Perini JV was awarded contract C1151 for Westside Purple Line Extension Section 3—Tunnels Project. This project consists of two (2) bored subway tunnels; 13,680 LF excavated using Earth Pressure Balance TBMs. The tunnels are being lined with pre-cast concrete segments.
TBM "Iris," launched in October 2020, and TBM "Aura," launched in November 2021. Iris has .76 miles of tunneling remaining; Aura has .83 miles. Final project completion is set for February 2023.
Two (2) Parallel Tunnels
13,680 LF (2.56 miles) each of 23.4-ft. Ø EPB Tunnel Boring
13,680 LF (2.56 miles) each of Pre-Cast Concrete Tunnel Segment Installation
14 Cross-Passages each
Click here to learn more about LA Metro's Purple (D Line) Extension Transit Project.
Frontier-Kemper/Tutor Perini JV
11500 Wilshire Blvd.
Los Angeles, CA 90025