Westside Purple Line Extension

Section 3—Tunnels Project
PROJECT DETAILS:
LOCATION: Los Angeles, CA

MARKET: Transportation

OWNER: LA Metropolitan Transportation Authority

CONTRACTOR: Frontier-Kemper/Tutor Perini JV

START DATE: January 2019

END DATE: February 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. 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.


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

Phone: +1 (818) 362-2062
Fax: +1 (818) 833-4289
information@frontierkemper.com
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