Tunnel Business Magazine

APR 2018

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Page 43 of 47

TUNNELINGONLINE.COM TBM: TUNNEL BUSINESS MAGAZINE // APRIL 2018 CALIFORNIA 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 exten- sive effort by the Sanitation Districts of Los Angeles County to analyze the needs of its Joint Outfall System to the year 2050. The outfall 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 tun- neling work will be done from a single shaft. Structures located at the start and end of the tunnel will connect to the ex- isting Ocean Outfall System facilities. Ap- proval of plans and approval to advertise was scheduled for the April 11 Board of Directors meeting. Moccasin unnel Improvements This project for the San Francisco Pub- lic Utilities Commission (SFPUC) involves 12 miles of rehabilitation of the 10-ft di- ameter, concrete-lined, horseshoe tunnel. Work includes concrete lining repairs, contact grouting, downstream valve control structure, large control valve in- stallations, new tunnel adit, adit/portal improvements, tunnel siphon extension, water cut-off grouting, water discharge treatment, access roadway improvements, temporary staging area excavations and grading, and environmental mitigations. Most of the work will be 1,000 ft below ground surface and will be accessed via the downstream Priest Portal, and Ad- its 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 Intake. The project designer is McMillen Jacobs Associates (MJA) with AECOM as environmental consultant. Project design and environmental review has commenced, and both phases are an- ticipated to be completed at the end of 2019. Construction is scheduled for 2020 through 2026. Nacimiento Interlake Tunnel The Interlake Tunnel for the Monterey County Water Resources Agency com- prises an 11,000-ft long, 10-ft diameter, gravity-flow tunnel and related struc- tures that would divert water from Lake Nacimiento (Nacimiemto Reservoir) to Lake San Antonio (San Antonio Reser- voir). The engineering firm EPC Consul- tants has been hired as Program Manager. McMillen Jacobs Associates and GEI Inc. have been retained for preliminary engi- neering and design services. Construction is scheduled to begin in Q3 2019. The esti- mated project cost is $80 million. Sacramento California Water Fix The California Water Fix Program is a comprehensive effort to improve water conveyance in the Sacramento-San Joa- quin Delta region. Key components of the program include a series of water convey- ance tunnels that will allow for transport of up to 9,000 cfs of water directly from the Sacramento River to the major ex- port pumping plants in the south end of 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 convey- ance tunnels will be configured in a par- allel twin bore arrangement, with tunnel 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 con- structed along each tunnel reach. Tun- nel design is anticipated to commence in mid-2019 with the first tunnel contracts being advertised for construction bids in mid/late-2020. Subsequent tunnel con- struction packages will be advertised on approximate 6-month intervals following the first contract award. San Jose BART Silicon Valley Extension The Santa Clara Valley Transportation Authority has a June 2018 deadline for completion of the project development for its 6-mile project into downtown San Jose, 5 miles of which would be subway construction, including four stations. The overall project is a 16-mile extension the Bay Area Rapid Transit system in the San Francisco Bay area. VTA is considering twin- and single-bore options for the sub- way section. A single bore would be on the order of 45 ft in diameter. Cost estimates are in the range of $5 billion. Project con- struction could begin in 2020 or 2021 ac- cording to preliminary plans. DISTRICT OF COLUMBIA Washington Potomac River Tunnel Project The Potomac River Tunnel is a compo- nent 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 facili- ties under the DC Clean Rivers Project, in- cluding a 2025 deadline to implement the project in its entirety. The Potomac River Tunnel will be located approximately 100 ft below ground. MARYLAND-DC Baltimore-Washington erc The Environmental Impact Statement for the first leg of the Northeast Corridor Superconducting Maglev project is under- way with the Record of Decision antici- pated in 2019. Construction is planned for 2020. The first leg comprises 60 km from Washington to Baltimore, 75 percent of the alignment in tunnel, and three under- ground stations (Washington, Baltimore and BWI Airport). The total cost is over $10 billion. TBM tunneling is anticipated as a single bore with guideways (outside tunnel diameter approximately 15 m). Five or six TBMs are anticipated. Owner: TNEM/BWRR; Prime Consultant: Louis Berger; Tunneling subconsultant: Gall Zeidler. MISSOURI St. Louis Project Clear Tunnels Metropolitan St. Louis Sewer District (MSD) has begun an ambitious program called Project Clear, a multi-billion dollar investment addressing wastewater over- flows. The system improvements include construction of nine tunnels to control sewer overflows. 4 4 U P C O M I N G P R O J E C T S

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