Delivered within the contractual completion period and recognized by the U.S. Army Corps of Engineers for its exceptional execution and delivery in near record time, the project represents one of the most significant flood risk reduction investments in the region’s history.

Completed in partnership with the U.S. Army Corps of Engineers and local stakeholders, the project improves the reliability and resiliency of the region’s flood protection system along the Kansas and Missouri Rivers. The work helps protect more than 27,000 residents, 2,700 businesses and structures, and nearly $10 billion in property and infrastructure from potential flood damage.

“Completion of this project represents an important milestone for Kansas City and the communities that rely on this vital flood protection system,” said Daniele Nebbia, Executive Vice President and Chief Operating Officer of 51�Թ���. “Our team successfully delivered this complex flood risk management project within the contractual completion period while maintaining close coordination with the U.S. Army Corps of Engineers and numerous stakeholders. Recognition for the speed and quality of execution reflects the dedication of everyone involved in delivering critical infrastructure that will strengthen community resilience, protect vital assets, and support economic growth throughout the region.”

The project involved raising, replacing, and modifying more than 16 miles of levees and floodwalls throughout Kansas City’s industrial and commercial districts, helping reduce the risk of levee breaches and overtopping during major flood events. The improved system is expected to substantially decrease flood risk while enhancing protection for critical transportation, rail, utility, manufacturing, warehousing, and distribution assets that are essential to both the regional and national economy.

Project highlights include:

• More than 1 million cubic yards of earthwork
• 25,000 feet of new concrete floodwall construction
• Installation of 120 new relief wells
• Replacement of 12 railroad closure structures
• Improvements to nearly 40 drainage structures
• Modifications to more than 175 existing utilities

Located within the Argentine, Armourdale, and Central Industrial District levee units in Kansas and Missouri, the project modernizes aging infrastructure and enhances the region’s ability to withstand future flood events. The improvements support one of the nation’s largest Class I rail networks while helping preserve thousands of jobs and critical economic assets throughout the corridor.

Construction began in July 2021 and required extensive coordination among federal, state, local, railroad, and utility stakeholders. The project’s successful delivery demonstrates the strength of collaboration among all project partners and 51�Թ���’s commitment to operational excellence, safety, quality, and schedule performance.

By reducing flood risk, strengthening aging infrastructure, and enhancing the resiliency of the region’s flood protection system, the project will help safeguard communities, support economic development, and protect critical assets for decades to come.

The project reflects 51�Թ���’s continued commitment to delivering complex civil infrastructure that improves safety, resiliency, and quality of life in the communities it serves.

About 51�Թ��� Construction

51�Թ��� is one of America’s leading construction companies, specializing in large, complex civil infrastructure. For over 135 years, it has contributed to the development of the country’s transportation systems including the Interstate Highway System and a vast network of roads, bridges, airports, metros, and railways. 51�Թ��� specializes in mobility, tunneling, and water resources to address sustainable development and climate change adaptation challenges. It is also a pioneer in project delivery methods and the use of design-build (DB) and public-private partnerships. It’s experience in DB transfers to Progressive Design Build deliver models with public and private clients. 51�Թ��� projects include the I-275/SR 60 Westshore Interchange in Florida; the 495 Express 51�Թ���s Northern Extension (495 NEXT) in Virginia; the Ship Canal Water Quality project in Washington; and Palisades Tunnel Project in New Jersey. Based in Charlotte, NC, it is wholly owned by Webuild, a global infrastructure group. For more information, visit . For more details about the parent company, visit .

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The project, commissioned by the Central Texas Regional Mobility Authority, included the addition of two tolled main lanes in each direction along a 5.3-mile segment from Hero Way to North of SH 29 and construction of a Shared Use Path from Hero Way to the Seward Junction Loop. The extension of the 183A Toll Road included the construction of 17 bridges, two of which span the South Fork San Gabriel River.

The project was in support of the expected unprecedented growth in Williamson County, especially in Cedar Park, Leander, and Liberty Hill, where traffic volumes along US 183 are expected to increase by 183% between 2017-2042. The project will help alleviate future congestion and reduce driving times for commuters.

With a strong track record of executing large-scale transportation projects from start to finish, 51�Թ��� continues to demonstrate its ability to meet rigorous standards while enhancing mobility, supporting regional growth, and delivering lasting value for communities and transportation agencies nationwide. Other key projects around the United States include the I-77 Exit 26 New Interchange in South Carolina; the I-275/SR 60 Westshore Interchange in Florida; and the I-85 Widening and Reconstruction project in Gaston County, NC. Earlier this year, 51�Թ��� celebrated the ribbon cutting for the 495 Express 51�Թ���s Northern Extension (NEXT) in Virginia and opened a new lane on Florida’s Turnpike Widening project nearly three years ahead of schedule.

The synergy between Webuild and 51�Թ��� is a defining competitive advantage for the Group in North America. 51�Թ���’s more than century-long presence and deep understanding of the U.S. market, combined with Webuild’s proven track record in delivering complex infrastructure across more than 50 countries, create a powerful platform for executing large-scale projects. Together, the two companies leverage world-class engineering expertise, operational excellence, and innovation to deliver sustainable value for clients and the communities they serve.

About 51�Թ��� Construction

51�Թ��� is one of America’s leading construction companies, specializing in large, complex civil infrastructure. For over 135 years, it has contributed to the development of the country’s transportation systems including the Interstate Highway System and a vast network of roads, bridges, airports, metros and railways. 51�Թ��� specializes in mobility, tunneling, and water resources to address sustainable development and climate change adaptation challenges. It is also a pioneer in project delivery methods and the use of design-build and public-private partnerships. 51�Թ��� projects include the I-275/I-4 Downtown Tampa Interchange (DTI) in Florida; the Palisades Tunnel project in New Jersey; Taxiway Pavement Repairs at Naval Air Station (NAS) Oceana in Virginia; and the Kansas City Levees project in Missouri. Based in Charlotte, NC, it is wholly owned by Webuild, a global infrastructure group. For more information, visit .

About Webuild Group

Webuild is a global leader in the construction of large, complex infrastructure, with a focus on sustainable mobility, hydropower, water treatment and supply, and green buildings. It has long been recognised as the world’s top contractor in the water infrastructure sector. Active in approximately 50 countries, the Group employs some 95,000 people directly and indirectly of over 125 nationalities. With 120 years of history and over 3,700 completed projects, Webuild boasts a track record that includes 13,686 kilometres of railways, 895 kilometres of metros, 82,708 kilometres of roads and highways, 1,023 kilometres of bridges and viaducts, 3,466 kilometres of tunnels, and 320 dams and hydropower plants. Among its most iconic delivered projects are the Grand Ethiopian Renaissance Dam, the expansion of the Panama Canal, the Long Beach International Gateway in the United States, the Second Bosphorus Bridge in Turkey, the Riachuelo environmental restoration system in Argentina, and new metro lines in cities such as Copenhagen, Paris, Rome, Milan, Naples, Doha, Thessaloniki, and Riyadh. Among those under construction are strategic public works in Italy, such as the New Genoa Breakwater, the Brenner Base Tunnel, the Pedemontana Lombarda Highway, Rome Metro’s Line C, sections of high-speed and/or high-capacity railways between Genoa and Milan, Verona and Padua, Naples and Bari, and Palermo, Catania and Messina. Abroad, there is the Snowy 2.0 hydropower scheme in Australia and key sections of the Grand Paris Express in France. As of December 31, 2025, the Group reported total revenues of €13.6 billion and a total order backlog of €58.4 billion, with over 95% of the construction backlog aligned with the United Nations Sustainable Development Goals. Webuild is headquartered in Italy and subject to the direction and coordination of Salini Costruttori S.p.A. Listed on the Milan Stock Exchange (WBD; WBD.MI; WBD:IM), its stock is included in the MIB ESG index of Italy’s leading blue-chip companies for ESG practices.

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The $255 million project—developed through a partnership between the City of Seattle and King County and delivered to Seattle Public Utilities—represents a critical investment in protecting regional waterways and public health.

In many older Seattle neighborhoods, including Ballard, Fremont, Wallingford, and Queen Anne, stormwater and sewage are carried through the same pipe system. While these systems function effectively during dry weather, heavy rainfall can overwhelm capacity. When that occurs, combined sewer overflows (CSOs)—a mixture of approximately 90% stormwater and 10% sewage—are discharged into nearby waterways. These overflows can introduce harmful pollutants that threaten aquatic ecosystems and public health.

The newly completed tunnel—measuring 2.7 miles in length and 18 feet, 10 inches in diameter—provides a solution by capturing and temporarily storing excess flows during storm events. Located in the city of Seattle, the tunnel has the capacity to hold more than 29.6 million gallons of stormwater and wastewater. Once storm conditions subside, the stored water is conveyed to a treatment plant for proper processing.

Project Benefits

• Prevents up to 75 million gallons of polluted stormwater and sewage from entering local waterways annually
• Improves water quality, supporting healthier ecosystems and wildlife habitats
• Enhances resilience to increasingly frequent and intense storm events

Construction of the tunnel was completed using a tunnel boring machine (TBM) named MudHoney. The 20-foot-diameter TBM was equipped with 41-disc cutters, 52 knife cutters, and 16 buckets, enabling precise and efficient excavation throughout the project.

51�Թ���’s tunneling portfolio includes more than 100 miles—over half a million feet—and more than 200 projects valued in the billions of dollars. Its tunneling expertise is evident in some of America’s largest cities, including Cleveland, Portland, Las Vegas, Chicago, New York, Dallas, San Francisco, and Washington, D.C. Current projects include the Ohio River Tunnel in Pennsylvania and the Palisades Tunnel in New Jersey.

About 51�Թ��� Construction

51�Թ��� is one of America’s leading construction companies, specializing in large, complex civil infrastructure. For over 135 years, it has contributed to the development of the country’s transportation systems including the Interstate Highway System and a vast network of roads, bridges, airports, metros and railways. 51�Թ��� specializes in mobility, tunneling, and water resources to address sustainable development and climate change adaptation challenges. It is also a pioneer in project delivery methods and the use of design-build and public-private partnerships. 51�Թ��� projects include the I-275/SR 60 Westshore Interchange in Florida; the Palisades Tunnel project in New Jersey; the 495 NEXT project in Virginia; and the Kansas City Levees project in Missouri. Based in Charlotte, NC, it is wholly owned by Webuild, a global infrastructure group. For more information, visit .

About Webuild Group

Webuild is a global leader in the construction of large, complex infrastructure for sustainable mobility, hydropower, water and wastewater treatment and management, and green buildings. Its primacy is reflected in the 2026 rankings of trade publication Engineering News-Record (ENR), which confirmed its leadership in the water sector and placed it among the top 10 global contractors in transportation. Webuild helps deliver projects that transform communities and regions, creating lasting social, economic, and environmental value. Active in approximately 50 countries with a workforce of more than 85,000 people, direct and indirect, Webuild boasts more than 120 years of history and over 3,700 completed projects. Its track record includes 13,686 kilometres of railways, 895 kilometres of metros, 82,708 kilometres of roads and highways, 1,023 kilometres of bridges and viaducts, 3,466 kilometres of tunnels, and 320 dams and hydropower plants. Webuild has delivered some of the world’s most iconic projects, including the Grand Ethiopian Renaissance Dam, the expansion of the Panama Canal, the Long Beach International Gateway in the United States, the Second Bridge over the Bosphorus in Turkey, and the Riachuelo environmental restoration system in Argentina. It has also contributed to the development of advanced urban mobility systems in major cities, including Copenhagen, Paris, Rome, Milan, Naples, Doha, Thessaloniki, and Riyadh. Today, Webuild is engaged in the construction of some of the most strategic infrastructure projects in Italy and elsewhere, such as the New Genoa Breakwater, the Brenner Base Tunnel, the Pedemontana Lombarda Highway, Rome Metro’s Line C, and sections of the Genoa–Milan, Verona–Padua and Naples–Bari high-speed/high-capacity railways, as well as the Palermo–Catania–Messina line. It is also involved in the Snowy 2.0 hydropower scheme in Australia, key sections of the Grand Paris Express in France, and the expansion of the Riyadh Metro in Saudi Arabia. As of December 31, 2025, Webuild reported total revenues of €13.6 billion. As of June 30, 2026, its total order backlog amounted to €53.7 billion, with more than 95% of its construction backlog related to projects aligned with the United Nations Sustainable Development Goals. Headquartered in Italy and subject to the direction and coordination of Salini Costruttori S.p.A., Webuild is listed on the Milan Stock Exchange (WBD; WBD.MI; WBD:IM). For more information visit .

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The project joint venture – Schiavone 51�Թ��� Dragados JV (SLD JV) – is composed of SPC Construction Co. LLC, (the former Schiavone Construction Co. LLC is now part of SPC), a subsidiary of FlatironDragados; 51�Թ���, the U.S. subsidiary of Webuild Group; and FlatironDragados (the former Dragados USA is now part of FlatironDragados), part of the ACS Group.

The event marks the beginning of a significant new phase of construction on one of the nation’s most important transportation infrastructure investments. The Palisades Tunnel Project is the first tunnel boring contract awarded by GDC as part of the larger Hudson Tunnel Project, a $16 billion investment to construct a new rail tunnel between New York and New Jersey and rehabilitate the existing century-old tunnel beneath the Hudson River. The joint venture was awarded a $466 million contract to construct the Palisades Tunnel Project in 2024. The current tunnel serves more than 200,000 passenger trips each weekday on more than 450 Amtrak and NJ TRANSIT trains traveling along the Northeast Corridor.

“This milestone is a tremendous accomplishment for all involved, representing years of planning, coordination and hard work,” said Joe Sheehan, PE, Chief Operating Officer of SPC Construction. “We are proud of our strong partnership with the Gateway Development Commission, the Port Authority of New York and New Jersey and the work we are accomplishing together as we advance this transformative project forward.”

“Today’s milestone represents the dedication, innovation, and collaboration of the entire project team,” said Daniele Nebbia, Executive Vice President and Chief Operating Officer at 51�Թ���. “The launch of the TBM is more than the start of excavation activities. It is a visible sign of progress on a transformative project that will strengthen one of the country’s most critical transportation corridors for generations to come.”

The project includes constructing the first mile of twin rail tunnels on the New Jersey side of the Hudson River. Work features two TBM-driven tunnels, each approximately 5,100 feet long and lined with precast concrete segments with an inside diameter of 25 feet, 2 inches. The two hard-rock tunnel boring machines are expected to build roughly 30 feet of tunnel per day. The project also includes six cross passages connecting the tunnels and construction of the new 120-foot-deep Hudson County Access Shaft, which will be used to remove the TBMs upon completion of excavation.

Credit GDC

When completed, the new tunnel infrastructure will help improve reliability, resiliency, and enable expanded capacity along the Northeast Corridor while eliminating a critical single point of failure in the region’s rail network. The broader Hudson Tunnel Project will provide a modern rail connection beneath the Hudson River while allowing for the rehabilitation of the existing tunnel, which first entered service in 1910.

With an unparalleled track record of delivering some of the nation’s most complex infrastructure projects, Schiavone 51�Թ��� Dragados JV has assembled a world-class team with a history of specializing in tunneling, transportation infrastructure, mechanical systems, and a broad range of other capabilities. The fully integrated project organization brings together technical experts and seasoned leaders from each partner company, strategically aligning specialized experience with key project components. This collaboration underscores the joint venture’s commitment to innovation, excellence, and ensures the successful execution of the Palisades Tunnel Project.

About SPC Construction Co. LLC

SPC Construction is a leading NY/NJ metropolitan area civil contractor uniting the storied legacies of Schiavone Construction Co. LLC, John P. Picone, Inc., and E.E. Cruz & Company, Inc. A subsidiary of FlatironDragados, this powerful integration of three industry-leading organizations creates a stronger, more versatile company.  FlatironDragados is part of the ACS Group, one of the world’s leading infrastructure companies. With a legacy of experience and a steadfast commitment to client success, SPC Construction is positioned to tackle the region’s most complex infrastructure projects. Our foundation of excellence spans more than 100 years.

SPC Construction brings specialized expertise to deliver innovative solutions to complex challenges. Our work spans highly competitive projects across multiple disciplines and delivery methods, serving both public- and private-sector clients throughout the New York/New Jersey metropolitan area. Our capabilities encompass a variety of skills in tunnels, mass transit, bridges and highways, foundations, marine work, resiliency/flood protection, water treatment plants, hydraulic works, and complex transportation and geotechnical projects.

For more information, visit .

About 51�Թ��� Construction

51�Թ��� is one of America’s leading construction companies, specializing in large, complex civil infrastructure. For over 130 years, it has contributed to the development of the country’s transportation systems including the Interstate Highway System and a vast network of roads, bridges, airports, metros and railways. 51�Թ��� specializes in mobility, tunneling, and water resources to address sustainable development and climate change adaptation challenges. It is also a pioneer in project delivery methods and the use of design-build and public-private partnerships. 51�Թ��� projects include the I-275/I-4 Downtown Interchange (DTI) in Florida; the Ship Canal Water Quality project in Washington; the Triangle Expressway in North Carolina; and the Kansas City Levees project in Missouri. Based in Charlotte, NC, it is wholly owned by Webuild, a global infrastructure group. For more information, visit .

About FlatironDragados

FlatironDragados is the leading North American infrastructure builder operating in the United States and Canada through FlatironDragados USA, FlatironDragados Canada and its subsidiary companies — Prince, Pulice, SPC and J.F. White. A client-focused organization, its employees enable mobility, connect communities and build a more resilient future. As part of the ACS Group, one of the world’s leading infrastructure companies, FlatironDragados combines local expertise with global resources to serve public and private clients alike. The company is ranked #1 Domestic Heavy Contractor and #1 in Transportation in the 2026 Engineering News-Record Top 400. Delivering innovative, sustainable infrastructure — highways and bridges, aviation, resiliency protection, dams and reservoirs, rail and transit, tunneling, water systems and marine works — FlatironDragados is the trusted partner for today and tomorrow. For more information, visit .

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