Tunnel Business Magazine

DEC 2018

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Page 56 of 59

U P C O M I N G P R O J E C T S 5 7 TUNNELINGONLINE.COM MISSOURI St. Louis Project Clear Tunnels opolitan St. Louis Sewer District ) has begun an ambitious program called Project Clear, a multi-billion dollar in- vestment addressing wastewater overflows. The system improvements include construc- tion of nine tunnels to control sewer over- flows. Upcoming tunneling components of Project Clear include (Project, Construction Begin, Construction Cost Estimate, Tunnel Length, Tunnel Diameter): • L es Peres Storage Tunnel, 2027, $670,000,000, 9 miles, 30 ft dia • L amec Tunnel, 2021, $225,000,000, 6.8 miles, 8 ft dia • River Des Peres Tributaries CSO Tun- nel, 2028, $238,000,000, 16,300 ft, 17 ft dia • Upper River Des Peres CSO Storage Tunnel, 2032, $250,000,000, 10,900 ft, 22 ft dia NEW YORK New York Hudson Tunnel Project/Gateway The Hudson Tunnel Project is a new two- track heavy r Corridor from the Bergen P Jers ttan that will directly serve Penn Sta onsists of three major elements: the Hudson Yards right-of-way preservation project, the Hudson Tunnel, and the rehabilitation and moderniza er tunnel. A joint venture of WSP and STV has been awarded the design contract. The tunnel portion of the contract, estimat- ed at $12 billion to $13 billion, is envisioned to be a design-build contract including the Palisades Tunnel and Hudson Tunnel. Con- struction was expected to begin in 2019 but uncertainties regarding funding is impact- ing the schedule. New York Second Avenue Subway – Phase 2 Design is underway for the Phase 2 of the second Avenue Subway. A joint ven- ture of WSP and STV is working on the design for the project that extends the line northward from 96th Street to 125th Street – a total of 1.5 miles with three new sta- tions. The alignment will use some exist- ing tunnels originally built in the 1970s, in addition to new soft-gr - nels. The cost estimate for this phase of the project is $6 billion, with revenue service anticipated betwe A recently announced that the Federal Tran- sit Administration (FTA), part of the U.S. Department of Transportation, issued a regarding design changes from the original Environmental Impact Statement prepared in 2004. OHIO Cleveland NEORSD Project Clean Lake Project Clean Lake f Regional Sewer D ) includes several major tunnel components to store and convey combined sewer overflows. The projects include: • Westerly Tunnel Dewatering Pump Station – A $28 million, 46-ft diameter, 200-ft deep submersible Pump Station will bid in 2019; • Shoreline Storage Tunnel – 15,300 lf of 21-ft diameter soft ground CSO tunnel. It is anticipated to bid in 2021; • Shoreline Consolidation Sewer – 11,700 lf of 9.5-ft diameter soft ground tunnel. It is anticipated to bid in 2021; • Southerly Storage Tunnel – 18,340 lf of 23-ft diameter CSO tunnel. It is antici- pated to bid in 2024; • Big Creek Storage Tunnel – 22,400 lf of 18-ft diameter CSO tunnel. It is antici- pated to bid in 2029. RHODE ISLAND Pawtucket/East Providence Pawtucket Tunnel agansett Ba C) has begun conceptual design of the third and final phase of its Combined Sewer Overflow Program. Phase III includes the Pawtucket T C's second CSO storage tunnel. C completed the Providence Tunnel, a 16,500-ft long, 26-ft diameter CSO storage tunnel, in 2008 during Phase I of its CSO pro- gram. The Pawtucket Tunnel will be approxi- mately 13,000 ft long, 28 ft in diameter and located in bedrock about 200 ft below the ground surface. The contract to construct the Pawtucket Tunnel will include the launch and recovery shafts (which will become permanent access shafts), two to three drop shafts with connecting adits at existing out- fall locations, and an underground shaft- or cavern-style tunnel pump station. The launch shaft and tunnel pump station will be located a C's Bucklin Point Waste- water Treatment Facility in East Providence, Rhode Island. The alignment will be parallel to the Seekonk River and Blackstone River, and end near the border of Pawtucket and Central Falls, Rhode Island. An 8,800-ft long, 10-ft diameter conveyance tunnel, which will connect to the Pawtucket Tunnel, is planned to begin after the Pawtucket Tun- nel is completed. The program/construction manager for Phase III is Stantec and its team- ing partner Pare Corporation. Construction of the Pawtucket Tunnel is anticipated to be- gin in late 2020 or early 2021. TEXAS Austin Phase 2 Lake Travis Deep Water Intake The Brushy Creek Regional Utility Au- thority (BCRUA) has embarked on a multiple year program to increase capacity and man- age concerns associated with recent historic low water levels of Lake Travis. The program includes: a multiple level-screen deep water intake assembly and shaft extending about 70-ft below lake bottom; approximately 10,000-ft of 96-in. diameter tunnel to convey water by gravity from the intake to a new on-shore pump station (with a subterranean forebay, multiple individual pump wells and a 30 ft diameter wetwell extending about 300 ft below grade); and 3,000-ft of 84-in. diameter pressurized transmission tunnel. Final design is anticipated to begin in 2019, and construction is anticipated to begin in 2021 or 2022. BCRUA is currently acquiring easements for the project. VIRGINIA Alexandria AlexRenew Tunnel A joint plan prepared by Alexandria Re- new Enterprises (AlexRenew) and the City of Alexandria outlining an approach to remedi- ate a portion of Alexandria's sewer system built in the late 1800s was been accepted by the Virginia Department of Environmental Quality (DEQ). The plan's infrastructure in- cludes construction of a deep tunnel system, approximately 2 miles long, and new sewer infrastructure to connect the tunnels to the existing sewer system. Once completed, the new tunnel system will connect to the existing outfalls to pre- vent millions of gallons of sewage mixed with rainwater from reaching rivers and streams. AlexRenew, in a partnership with the City of Alexandria, will lead the plan- ning, design, and implementation of the plan to remediate the outfalls by 2025. Hampton-Norfolk Hampton Roads Bridge-Tunnel The HRBT Expansion project will build another bridge-tunnel and widen the four- lane seg - folk to ease daily congestion between the Peninsula and South Hampton Roads, a cor- ridor vital to Virginia's economy. The project owner, VDOT, announced that both short listed teams have opted to use the bored tun- nel method as the basis for their proposals, which will be submitted in late 2018. The project cost is estimated between $3.3 and $3.8 billion, with contract award expected in early 2019. WASHINGTON Seattle Ship Canal Water Quality Project Seattle Public Utilities is planning to build a tunnel jointly with King County to reduce the amount of combined sewer overflows into local waterways. Construction is expect- ed to start the first half of 2019. The project includes a 2.7-mile long storage tunnel with a diameter of 18 ft, 10 in. excavated by PEB 30 to 90 ft below grade. Estimated cost for the storage tunnel is $175 million to $225 million. The design-bid-build construction contract is scheduled to advertise in Q2 2019 with completion by Q4 2022. TBM: TUNNEL BUSINESS MAGAZINE // DECEMBER 2018

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