Westside Purple Line Extension

Section 3—Tunnels Project
LOCATION: Los Angeles, CA

MARKET: Transportation

OWNER: LA Metropolitan Transportation Authority

CONTRACTOR: Frontier-Kemper/Tutor Perini JV

START DATE: January 2019

END DATE: Dec. 2023
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. Both TBMs have completed tunneling and holed through in October 2023. Final project completion is set for December 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.

Underground Mine Vertical Conveyor System
tunnel boring machine contractor
precast concrete tunnel lining
underground engineering and shop services
Frontier-Kemper/Tutor Perini JV
11500 Wilshire Blvd.
Los Angeles, CA 90025

Phone: +1 (818) 362-2062
Fax: +1 (818) 833-4289