Tunnel Business Magazine

AUG 2018

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Issue link: http://digital.tunnelingonline.com/i/1014911

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Page 37 of 43

3 8 U P C O M I N G P R O J E C T S CALIFORNIA Los Angeles to San Francisco California High-Speed Rail The California High-Speed Rail Author- ity is building a rail link from Los Angeles to San Francisco that will allow passengers to complete the journey in just 2 hours and 40 minutes. Work is underway in the Cen- tral Valley. Tunnels will be required in the north across the California Coast Range between Gilr ced; and in the south in the T etween Bakersfield and Palmdale, and the San Ga - tains between Palmdale and Burbank. The alignments currently under consider- ation involve between 45 to 50 miles of tun- nels that range in length from several thou- sand feet to over 20 miles, some of which are over 2,000 ft underground. The target rev- enue service date for the Los Angeles to San Francisco segment is 2029, according to the authority's Draft 2018 Business Plan. As part of the effort to advance the Sili- con Valley to Central Valley Line of the program, the California High-Speed Rail Authority (Authority), along with its geo- technical consultants Kleinfelder Inc. and Fugro Consultants, have conducted geo- technical explorations in the City of San Jose and Santa Clara County. WSP is serving as the authority's Rail De- livery Partner (RDP). Los Angeles Clearwater Program Effluent Outfall Tunnel The Clearwater Program's Joint Water Pollution Control Plant (JWPCP) Effluent Outfall Tunnel Project is part of an extensive effort by the Sanitation Districts of Los Ange- les County to analyze the needs of its Joint Outfall System to the year 2050. The Efflu- ent Outfall Tunnel is envisioned to enhance the existing 8- and 12-ft tunnels with a new 37,000-lf, 18-ft ID post-tensioned concrete segmented lined tunnel. All tunneling work will be done from a single shaft located at the Districts' JWPCP located in the City of Car- son. Structures located at the start and end of the tunnel will connect to the existing Ocean Outfall System facilities. Bids are due Sept. 18, 2018, with award scheduled for Oct. 24, 2018. Construction is anticipated to start Q1 2019. Web: www.clearwater.lacsd.org Moccasin Mountain Tunnel Improvements This project for the San Francisco Public Utilities Commission (SFPUC) involves 12 miles of rehabilitation of the 10-ft diameter, concrete-lined, horseshoe tunnel. Work in- cludes concrete lining repairs, contact grout- ing, downstream valve control structure, large control valve installations, new tun- nel adit, adit/portal improvements, tunnel siphon extension, water cut-off grouting, water discharge treatment, access roadway improvements, temporary staging area ex- cavations and grading, and environmental mitigations. of the work will be 1,000 ft below ground surface and will be accessed via the downstream Priest Portal, and Adits 5/6 and 8/9 at intermediate locations along the alignment. Access will also be available 7 miles upstream via the 13.5-ft diameter unlined section of the tunnel from Early In- take. The proje obs Associa viron- mental consultant. Project design and envi- ronmental review has commenced, and both phases are anticipated to be completed at the end of 2019. Construction is scheduled for 2020 through 2026. Nacimiento Interlake Tunnel The Interlake Tunnel f ey County Water Resources Agency comprises an 11,000-ft long, 10-ft diameter, gravity-flow tunnel and related structures that would divert water from Lak - iemto Reservoir) to Lake San Antonio (San Antonio Reservoir). The benefits of the proj- ect include increased surface water supply and reduced flooding downstream of Lake erting water into Lake San Antonio that would otherwise flow out to the ocean. The project also includes a spill- way modification at Lake San Antonio to add an additional 45,000 acre-feet of water stor- age. The engineering firm EPC Consultants has been hired by the agency as Program or the proje obs Associates and GEI Inc. have been retained for preliminary engineering and design ser- vices for the projects. Design was 30 percent complete as of June 2018. Design-build SOQ is scheduled for Q4 2018. Construction is scheduled to begin in Q4 2019. The estimated project cost is approximately $80 million. Web: www.mcwra.co.monterey.ca.us/in- terlake_tunnel/interlake_tunnel.php Sacramento California Water Fix The California Water Fix Program is a comprehensive effort to improve water conveyance in the Sacramento-San Joaquin Delta region. Key components of the pro- gram include a series of water conveyance tunnels that will allow for transport of up to 9,000 cfs of water directly from the Sac- ramento River to the major export pump- ing plants in the south end of the Delta. The components of this program will replace the current water diversion activities that rely on a series of improved channels and canals to move the water southward in the Delta. The program consists of three river intake structures, approximately 10 miles of 29-ft and 40-ft ID tunnels, and approximately 60 miles of 40-ft ID main conveyance tunnels, and a 9,000 cfs pumping facility located at the terminus of the main tunnels. The main conveyance tunnels will be configured in a parallel twin bore arrangement, with tun- nel invert depth of averaging approximately 150 ft below ground surface. In addition to launching and receiving shafts, a series of ventilation/access shafts will be construct- ed along each tunnel reach. Current con- ceptual engineering efforts have been com- pleted and the EIR/EIS were expected to be finalized at the end of June 2017. Tunnel de- sign is anticipated to commence in mid-2019 with the first tunnel contracts being adver- tised for construction bids in mid/late-2020. Subsequent tunnel construction packages will be advertised on approximate 6-month intervals following the first contract award. Approximately five to six tunnel construc- tion contracts will be awarded under this program. It is currently anticipated the fa- cilities will be operational by 2033. Web: www.californiawaterfix.com/ San Jose BART Silicon Valley Extension On June 4 the Federal Transit Administra- tion issued a Record of Decision for the $4.7 billion, 6-mile BART Silicon Valley Phase II Extension into downtown San Jose. Five miles of the extension are planned to be underground, constructed by a single, large- bore order of 45-ft in diameter. The extension includes four stations (three underground). The overall project is a 16-mile extension of the Bay Area Rapid Transit sys- tem in the San Francisco Bay area. Cost esti- mates are in the range of $5 billion. Project construction is planned to start by 2021 with passenger service by 2026. A joint venture of TB and WSP agreed to a four-year, $88.3 million program management contract with the owner, Santa Clara Valley Transportation Authority (VTA). Web: http://www.vta.org/bart/ DISTRICT OF COLUMBIA Washington Potomac River Tunnel Project The Potomac River Tunnel is a component of DC Water's long-term control plan (LTCP), also known as the DC Clean Rivers Project. The Consent Decree establishes schedules for construction of the Potomac River Tunnel and other CSO control facilities under the DC Clean Rivers Project, including a 2025 dead- line to implement the project in its entirety. The Potomac River Tunnel will be located ap- proximately 100 ft below ground. CSOs cap- tured by the Potomac River Tunnel would be conveyed to the Blue Plains Advanced Wastewater Treatment Plant. MARYLAND-DC Baltimore-Washington Northeast Corridor Superconducting Maglev The Environmental Impact Statement for TUNNELINGONLINE.COM TBM: TUNNEL BUSINESS MAGAZINE // AUGUST 2018

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