Tunnel Business Magazine

APR 2018

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Page 17 of 47

TUNNELINGONLINE.COM C O V E R S T O RY 1 8 TBM: TUNNEL BUSINESS MAGAZINE // APRIL 2018 The forecast completion date is De- cember 2021, with ridership expected to reach 90,000 daily boardings by 2035. PURPLE LINE EXTENSION The Purple Line Extension comprises 9 miles of twin bore tunnel section that will extend the existing line at its ter- minus at Wilshire/Western westward through Beverly Hills and into West Los Angeles. The roughly $9 billion program is being built in three separate phases. Phase 1 – Phase 1 involves extend- ing the Purple Line 3.92 miles from Wilshire/Western to a new station at Wilshire/La Cienega. It also includes stations at Wilshire/La Brea and Wilshire/Fairfax. The project includes the western retrieval shaft and 23 cross passages. The $1.636 billion tunnel and stations contract was awarded to a joint venture of Skanska, Traylor Bros. and J.F. Shea Co. in 2014. The project is about one- third c - pected to begin this August. The launch shaft is about 50 percent complete, and excavation is underway at all station lo- cations. The forecast completion date for Phase 1 is 2023. Phase 2 – The $1.37 billion Phase 2 tunnels and stations contract was awarded to a joint venture of Tutor Peri- ni and O&G in 2017. The second section will add another 2.6 miles to the Purple Line with one station at Wilshire/Rodeo in downtown Beverly Hills and a sta- tion in the heart of Century City. The project is 6 percent complete overall, with the design about 50 per- cent complete. Current construction ac- tivities include advanced utility reloca- tion. Completion of Phase 2 is expected by 2025. Phase 3 – Phase 3, which falls under enditure plan, is cur- rently in procurement. Unlike Phases 1 and 2, o is releasing separate con- tracts: one for tunneling and one for stations, trackwork and systems. Phase 3 comprises 2.59 miles of twin bore tun- nel and stations at Westwood/UCLA and Westwood/VA Hospital. The proj- ect budget is approximately $3 billion. Project completion is anticipated by 2026. Phase 3 is particularly important for the 2028 Olympics as UCLA will be one of the main venues. "The western side of Los Angeles is very congested and the completion of the Purple Line Extension will help meet pent-up demand in that area," Pennington said. "The completion of the Expo Line to the west exceeded ridership projections, and I suspect the Purple Line will be equally successful." METRO'S METHODS With a wealth of recent experience, o is in the enviable position of fine-tuning how it manages projects based on first-hand knowledge. For the e R projects – Crenshaw/LAX, Regional Connector and Purple Line o used design-build procurement for major underground works. While used more routinely out- side of the United Sta o was one of the first U.S. agencies to use design- build for a major underground transit project. "Design-build is a contract delivery method that in the appropriate context can be extremely successful for large transit projects," Pennington said. "In fact, I was involved on one of the first commercial applications of design-build in transit in the 1980s in the United Kingdom, so there is a long track re- cord of success. Of course, it is like any other delivery method; it is a tool, and you need to choose the right tool for the right application." o still employs a range of de- livery methods, including design-bid- build, and is looking at potentially us- ing GC and/or P3 in the future. In determining a procurement method, o has adopted a formal process that includes a checklist of items to consider, including project size, project type, bud- get, schedule, complexity, interfaces, stakeholders, third parties and more. The geology in the Los Angeles ba- sin comprises fill, alluvium, sands and silts, as well as San Pedro and Fernando formations. The area is also potentially gassy and has areas of seismicity and faults. Base o's experience, it requires the use of closed-face tunneling machines to navigate the ground. In the most recent projects, all of the contrac- tors ended up using earth-pressure bal- anc vorable results. o is evaluating the prospects of using P3 for future projects. Parsons Transportation Group and Cintra each submitted prop o that would accelerate construction of the Sepulveda Pass proje o also received propos- als each from Skanska and Kiewit for the West Santa Ana Branch project. The d nearly 50 projects that will help Los Angeles create a world-class transportation network. Airport o Connector – o is planning a new transit station that will connect the Los Angeles International Airport (LAX) to the regional transit system via an Automated People ected to begin in 2018. West Santa Ana Branch Transit Corridor – The project is a new 20-mile light rail transit line that would connect down- town Los Angeles to southeast LA County. The project is antici- pated to break ground in 2022. Gold Line Extension 2B – The project will extend the Gold Line east from its current terminus in Azusa for 12.3 miles. A ground-breaking ceremony was held on Dec. 2, 2017. The ex- tension is planned to open in 2027. East San Fernando Valley Transit Corridor – o is evalu- ating the feasibility of a mass transit project that would oper- ate fr o Orange Line Station north to San Fernando – a distance of 9.2 miles. A record of decision is ex- pected by the end of 2018. Sepulveda Pass Transit Corridor – o is conducting a fea- sibility study to identify and evaluate a range of high-capacity rail transit alternatives between the San Fernando Valley and LAX, including connections to existing and planne o bus and rail lines. A number of alignments and station locations will be considered. The Study is expected to take approximate- ly 20 months, concluding in Summer/Fall 2019. Green Line Extension – o is studying passenger transit service options along a 4-mile segment of the Harbor Subdi- vision Corridor from the existing Re - tion to the proposed Regional Transit Center (RTC) in Torrance. Construction would start in 2026. East Side Transit Corridor – o is studying three project alternativ o Gold Line further east from its current terminus in East Los Angeles. A Supplemental/Re- circulated Draft EIS/EIR is anticipated to be available for public review in mid 2020. FUTURE WORKS

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