As the Department of Energy (DOE), National Nuclear Security Administration (NNSA) and U.S. Air Force invest in revitalizing aging systems and transitioning to next-generation capabilities, 51�Թ� is providing the construction expertise required to execute work in highly regulated, high-consequence environments.

Restarting Plutonium Pit Production for National Security

is maintaining “a safe, secure, reliable and effective nuclear weapons stockpile.” Central to that mission is the production of plutonium “pits,” a process that had largely ceased decades ago. Today, national defense requirements have driven the need to , an effort that brings unique challenges.

Much of the infrastructure that once supported pit production no longer meets modern safety, security or environmental standards. Restarting production is not simply a matter of turning systems back on. It requires rebuilding capabilities, replacing failing facilities and constructing new infrastructure that supports today’s operational demands on a fast-paced timeline. These are exactly the conditions where 51�Թ� excels, bringing proven expertise and dependable delivery to DOE projects.

Supporting Operations at Los Alamos National Laboratory (TA-55)

At LANL, nearly all plutonium operations take place within the at Technical Area 55 (TA-55), the nation’s only fully operational, full-capability plutonium facility. As pit production ramps up, the need for modernized support infrastructure across the campus has grown significantly.

51�Թ� has delivered multiple projects supporting TA-55 that enhance safety, security and operational efficiency, including:

• West Entry Control Facility, supporting the secure movement of personnel into and out of the protected area
• East Emergency Vehicle Access, providing a dedicated inspection lane to ensure priority access for emergency response vehicles
• TA-55 Change Room Expansion, improving locker and restroom facilities to support an expanded workforce
• Pajarito Corridor Office Complex Task Order 1 and 3 (PCOC-1 & PCOC-3), delivering up to 300 office workstations and shared spaces to accommodate increased operations

These projects play a vital role in enabling mission execution beyond the walls of the plutonium facility itself.

Managing Waste and Safeguarding the Environment

Plutonium operations generate specialized waste streams that must be handled with precision and care. Supporting this requirement is the Transuranic Liquid Waste Facility, constructed by 51�Թ� to treat radioactive liquid waste generated at TA-55.

The facility houses systems designed to treat liquid waste so it meets stringent acceptance criteria before entering low-level liquid waste systems. 51�Թ� delivers infrastructure that supports environmental compliance and long-term stewardship, helping critical operations continue safely and responsibly.

Completing the Pit Lifecycle at Pantex

Plutonium pit production is a multi-site lifecycle that begins and ends at the Pantex Plant near Amarillo, Texas. At Pantex, aging pits are removed from weapons and prepared for shipment to Los Alamos, then later receive newly manufactured pits for storage and integration.

51�Թ� supports this mission through the High Explosive Science and Engineering (HESE) Complex, which provides laboratory space, classified and unclassified offices, meeting areas and specialized facilities for high explosives operations. The complex supports work that has been essential to the nation’s nuclear deterrent for decades.

Preparing Infrastructure for the Future of U.S. Nuclear Deterrence

Looking ahead, the United States is transitioning from the Minuteman III intercontinental ballistic missile system to the next-generation . This transition requires extensive modernization of facilities, command centers and support infrastructure.

51�Թ� recently delivered the , which supports systems testing, collaboration and integration for weapons programs. 51�Թ� is also constructing an integrated command center for the ICBM system, designed to include emergency power systems and specialized protection measures.

These projects represent the next phase of infrastructure required to support the nation’s evolving defense mission.

Building with Precision for High-Consequence Missions

Across all locations, 51�Թ� brings a consistent approach to mission-critical work: disciplined planning, rigorous safety culture and collaboration with federal partners. Our experience spans secure facilities, nuclear and explosives environments, regulatory compliance and long-term program support.

By delivering infrastructure that performs reliably under the most demanding conditions, 51�Թ� helps enable the missions that protect the nation and assure its allies.

From revitalizing plutonium pit production to preparing facilities for next-generation defense systems, our teams remain committed to building the infrastructure that makes these missions possible, today and for decades to come.

Learn more about 51�Թ�’ experience delivering complex federal and national security projects.

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From aviation and government to healthcare and high-tech, the 51�Թ� Way delivers solutions that meet the evolving needs of public agencies, private clients and our communities. Our integrated approach and client-first mindset continue to set us apart across various vertical markets, delivering excellence at scale while maintaining the highest standards across every jobsite.

Explore our project portfolio to see how we serve today’s needs and tomorrow’s possibilities.

Learn more about the rest of our ABC Rankings across multiple sectors:

• #1 Top Airport Contractors
• #3 Top Government Contractors
• #3 Top Hospitality Contractors
• #5 Top Entertainment Contractors
• #6 Top Office Contractors
• #6 Top Healthcare Contractors
• #7 Top High-Tech/Data Center Contractors
• #9 Top Education Contractors
• #18 Top Infrastructure Contractors

#1 Airport Contractors

We lead the nation in aviation construction, earning the #1 spot in Airport Contractors. Our portfolio includes more than 380 aviation projects at over 40 airports, totaling more than $29 billion in value and 55 million square feet of airport construction. We have successfully managed projects ranging from small-scale renovations to large, multi-phased terminal expansions, consistently maintaining airport operations and prioritizing passenger safety and experience.

Our expertise encompasses all facets of aviation construction, including terminal renovations, baggage handling systems, hangars and airside/landside improvements. We excel at working in active, operational airports, leveraging disciplined planning, stakeholder coordination and phased construction strategies to minimize disruption. Our approach is rooted in communication and collaboration with airport authorities, airlines, tenants and security agencies, ensuring seamless integration of construction activities with ongoing airport operations.

From our work across Nashville International Airport (BNA) to Denver International Airport (DEN), we continue to deliver transformative airport projects that enhance passenger experience. Learn more about our work in aviation construction.

#3 Top Government Contractors

Government agencies at all levels continue to rely on 51�Թ� for secure, mission-focused spaces. Ranking #3 in Government Contractors demonstrates our expertise in delivering secure, mission-driven facilities for federal, state and local agencies. Our expertise spans the design and construction of government offices, military installations, correctional facilities, courthouses, and secure spaces such as Sensitive Compartmented Information Facilities (SCIFs).

Our work on projects like the San Ysidro Land Port of Entry – Phase 2 and the Travis County Civil and Family Courts Facility reflects our deep understanding of public sector needs. 51�Թ� is adept at navigating the unique requirements of government work, including compliance with federal regulations, security protocols and sustainability standards. Our teams are experienced in managing complex, multi-phased projects in active environments, ensuring minimal disruption to ongoing operations.

Learn more about our work in government construction.

#3 Top Hospitality Contractors

Luxury, comfort and performance come together in our hospitality projects. Our #3 ranking in Hospitality Contractors highlights our ability to create welcoming, high-functioning spaces for guests and staff alike.

We have delivered a wide range of projects, from high-end new construction resorts and full-service convention center hotels to complex renovations and themed attractions. Our experience spans partnerships with some of the most prominent names in the industry, including Four Seasons, Marriott, Hilton, Hyatt, Universal Parks & Resorts and Disney Parks & Resorts. Notable projects include the Kilolani Spa at Grand Wailea Maui,  Four Seasons Resort Hualalai, Hilton San Diego Bayfront and Aventura Hotel at Universal Orlando.

From luxury hotels to resort campuses, our hospitality builds combine architectural excellence with operational efficiency. Learn more about our work in hospitality construction.

#5 Top Entertainment Contractors

51�Թ� is a recognized leader in the construction of entertainment and themed environments, delivering projects that range from small-scale renovations to large, ground-up theme parks and entertainment venues. Ranking #5 in Entertainment Contractors showcases our capacity to deliver dynamic, high-traffic venues.

51�Թ� understands the unique challenges of entertainment construction, including the need for precise coordination with specialty vendors, integration of advanced technology and strict adherence to fast-track schedules.

Whether it’s a sports arena like the Darrell K. Royal Texas Memorial Stadium South End Zone Addition or a Universal Orlando attraction, we bring precision and creativity to every entertainment build.

#6 Top Office Contractors

The workplace is evolving, and so are the spaces we build. Our #6 placement in Office Contractors reflects our strength in delivering modern, flexible workspaces. With a robust portfolio of projects ranging from high-rise commercial towers and corporate headquarters to government office buildings and specialized administrative facilities, our experience includes the successful delivery of more than 230 office buildings nationwide, serving both public and private sector clients.

Our work on projects like the May Lee State Office Complex and the 1021 O Street State Office Buildings focus on sustainability, technology integration and user experience. We continue to shape the future of commercial office environments.

#6 Top Healthcare Contractors

Ranking #6 in Health Care Contractors showcases more than four decades of experience and a multi-billion-dollar portfolio spanning new hospitals, major expansions, outpatient centers, medical office buildings and complex renovations.

Our teams are adept at managing complex, multi-phased projects, integrating advanced technologies and collaborating with hospital staff and stakeholders to ensure seamless project delivery. We prioritize transparent communication, rigorous safety protocols and proactive risk mitigation to protect patients, staff and visitors.

Our expertise includes working in active, operational healthcare environments, where safety, infection control and minimal disruption to patient care are paramount. 51�Թ� has completed more than 280 healthcare projects, including major facilities for clients such as Kaiser Permanente, UCHealth, City of Hope, Banner Health, Sharp Healthcare and the National Institutes of Health.

Learn more about our work in healthcare construction.

#7 Top High-Tech/Data Center Contractors

In a world powered by data, our #7 ranking in High-Tech/Data Center Contractors reflects our leadership in mission critical infrastructure.

Our experience encompasses new ground-up data centers, complex retrofits and live campus expansions, with individual projects ranging from 30,000 square feet to over 1,200,000 square feet and capacities exceeding 200 MW.

51�Թ� is adept at working in live, operational environments, implementing rigorous planning, security and safety protocols to ensure zero disruption to ongoing operations. Our teams are experienced in developing and executing formal Methods of Procedure (MOPs), production impact planning and high-security access controls. We maintain strong relationships with local authorities having jurisdiction (AHJs) to ensure timely permitting and compliance, and we leverage advanced Building Information Modeling (BIM) and Virtual Design & Construction (VDC) for efficient project delivery.

With projects across the U.S. supporting AI, cloud computing and digital transformation like our Montogomery Data Center project, we continue to build the backbone of our digital reality. Learn more about our work in mission critical construction.

#9 Top Education Contractors

Our environment shapes our learning and ranking #9 in Education Contractors highlights our commitment to building the right environments designed for learning and growth.

Our experience spans K-12 schools, higher education campuses, research laboratories, student housing and specialized academic facilities, delivering more than $4 billion across major university systems, including repeat work for clients such as UC San Diego, UC Irvine, UC Riverside, Caltech and the University of Texas. Our experience encompasses new construction, complex renovations and campus expansions, often delivered in active, occupied environments.

Our teams are adept at creating flexible, innovative teaching and learning spaces that support evolving education and technology integration. Learn more about our work in education construction.

#18 Top Infrastructure Contractors

Our #18 placement in Infrastructure Contractors reinforces our capabilities in delivering large-scale civil and public works projects. 51�Թ� is a proven leader in infrastructure construction, delivering complex water, wastewater and ground transportation projects that support communities and industry across the nation.

From water treatment facilities like the Kaneohe / Kailua Tunnel Influent Facility to transit systems like the Valley Metro Operations and Maintenance Center Expansion, we bring reliability and innovation to every infrastructure build. Learn more about our work in water construction and infrastructure construction.

ABC 2025 Rankings

These ABC 2025 rankings reflect 51�Թ�’ strategic investments in safety, workforce development and project excellence. Whether your focus is aviation, healthcare, education or mission critical infrastructure, our expertise is nationally recognized.

Explore our portfolio to see how our ABC-ranked capabilities can help build success for your next venture.

Contact us today to bring your next project to life.

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This urgent need to modernize infrastructure, integrate renewable energy sources and enhance grid resilience is leading to unprecedented growth in the power and energy sector. projects that up to $1.4 trillion in capital investments will be required from 2025 to 2030, with similar expenditures expected through 2050, fueled by electrification across industries, the expansion of AI-powered data centers and the resurgence of domestic manufacturing.

With electricity demand projected to rise by 10% to 17% by 2030, the stakes are high. While utilities work to modernize generation and transmission, facility owners, from school districts to data center providers to federal agencies, are tasked with designing energy-smart buildings that reduce reliance on the national grid while supporting operational independence.

Traditionally, mission critical facilities have relied on added layers of infrastructure, such as redundant cooling systems, backup generators and uninterruptible power supplies (UPS), to achieve N+1 redundancy and maintain operations during outages or maintenance events. While effective, these approaches often strain an already overburdened electrical grid.

As a builder of high-performance and technology-integrated environments, 51�Թ� is responding by delivering sustainable, resilient energy solutions that provide operational independence and reduce reliance on the national grid. Today’s resilient energy systems must deliver the same level of reliability with a cleaner footprint, integrating on-site renewable generation, battery storage and smart power management. Whether supporting public safety, data infrastructure, education or science, resilient infrastructure must also enable two-way communication with the grid and store energy for use when it’s needed most.

Powering Civic Resilience: How Sunnyvale’s Microgrid is Redefining Municipal Continuity

The Sunnyvale Civic Center Modernization includes several mission critical buildings, such as a new four-story City Hall building, a new two-story Emergency Operations Center that serves as an addition to the Department of Public Safety Headquarters building and renovations to the existing Public Safety Headquarters building. Integrated into the City Hall is a robust microgrid system, capable of toggling between traditional generator backup and a 680kW photovoltaic array paired with 250kWH battery storage. By leveraging solar power stored during the day, the system can maintain essential services, including emergency response, public safety coordination and city operations for multiple days without reliance on the external grid.

Resilience Without Compromise: Powering the Nation’s Digital Backbone at SSA NSC

The Social Security Administration National Support Center (SSA NSC) exemplifies what it means to build for uncompromised continuity, becoming the first federal data center to achieve Uptime Tier III certification. As a Tier III data center, every system within the facility is designed to be serviced or replaced without shutting down operations. Redundancy is built in with N+1 chilled water CRAC units for cooling and emergency power backup for the boiler plant, chillers and mission critical support systems. A 1 MW solar photovoltaic system spread across four acres feeds into a bi-directional utility metering system, enabling facility managers to precisely measure how much energy is produced on-site versus what’s drawn from the grid.

Resilient Energy at Scale: Setting a New Standard at the CARB SoCal Headquarters

Consolidating seven locations into one state-of-the-art campus, the California Air Resources Board (CARB) Southern California Headquarters is the world’s largest and most advanced regulatory vehicle emissions testing and research center. Not just a scientific powerhouse, it is also an energy resilience landmark. To meet LEED Platinum certification and Zero Net Energy (ZNE) goals, the facility is powered by a 3.8-megawatt photovoltaic (PV) system and a 1.5 MWh battery energy storage system (BESS) that integrates with a real-time power monitoring and control platform.

This system does more than generate clean energy; it enables strategic load shifting by storing excess solar production during the day and deploying it when the grid is under strain, typically during peak evening demand. The result is a facility that supports grid stability, reduces operational costs and ensures energy continuity even under stress.

Campus Independence Through Clean Technology: Caltech’s Chen Neuroscience Research Building

Located in Pasadena, California, the state-of-the-art Caltech Chen Neuroscience Research Building (CNRB) fosters cross-disciplinary collaboration, providing wet, dry and computational research labs. The building serves as the university’s new administrative and knowledge center for the Division of Biology and Biological Engineering, supporting more than a dozen principal investigators.

A defining feature of the CNRB is its ability to ensure that critical research continues uninterrupted. The integration of a Bloom hydrogen fuel cell energy system, a distributed energy platform, delivers continuous, high-efficiency power 24/7. Unlike most campus buildings, CNRB operates independently from the Pasadena power grid, with the city’s utility serving only as a backup to the Bloom system. A diesel-powered emergency generator with 16 hours of fuel serves as a third source of reliable energy. This forward-thinking approach ensures uninterrupted operations with the greatest level of electrical reliability and resiliency on the Caltech campus.

Operational Resilience at the Core: Contra Costa County Emergency Operations Center

The Contra Costa County Emergency Operations Center (EOC) was designed with a big goal in mind: uninterrupted functionality under adverse conditions. As the central hub for emergency coordination across the region, the facility integrates redundant systems and independent utilities to ensure operational independence for up to seven days.

To support full autonomy during emergencies, the Contra Costa County EOC is equipped with a comprehensive suite of infrastructure systems. From power and water to communications and decision-making, every component is engineered to support autonomous operation when external systems are compromised.

 A 750-kW generator, fed by an underground fuel tank, enables the facility to operate independently for up to seven days. Water resilience is achieved through a 50,000-gallon potable water tank and a 35,000-gallon fire water tank, while a 12,000-gallon sanitary sewer holding tank ensures continued operation of building systems even in the event of utility failure. In addition, the project relocated the existing photovoltaic array and expanded its capacity, with new solar panels and battery systems bringing the total renewable energy capability to 162 kW, offsetting almost 70% of the building’s energy cost.

The measures on these projects aren’t just about efficiency. They ensure that the digital backbone of critical services is protected, clean and resilient in the face of utility disruptions or climate emergencies.

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What is Mass Timber?  

Mass timber refers to a category of framing styles characterized by the use of large, engineered wood panels, often paired with engineered wood columns and beams. These structural elements work together to create strong, efficient structural framing systems. Common materials include cross-laminated timber (CLT) for floors and walls, and glue-laminated timber (glulam) for beams and supports. While CLT and mass timber construction are continuing to accelerate in North America, CLT remains a newer product in the industry, with many lessons still being learned as its popularity grows. 

51�Թ� recently completed the Caltech Resnick Sustainability Center (RSC), which features a mass timber structural grid shell. Comprised of glulam timber beams and columns, the shell extends from level 1 to the roof and is visible throughout the building’s north and west common spaces. CLT wood decking is utilized throughout the north and west perimeters of the building. 51�Թ� engaged a curtain wall consultant and mass timber trade partners to discuss the detailing associated with this scope. Throughout design and construction, the team learned valuable lessons related to fire protection, water mitigation, fabrication and installation of mass timber components.  

FIRE PROTECTION  

Fire safety is an inherent concern when building with wood. However, mass timber performs well in fire, due largely in part to the size and density of mass timber members. While common stick-frame structures use small pieces of lumber that are prone to burn easily, cross-laminated timber is produced by compressing layers of dimension lumber and the resulting large, solid piece of wood is difficult to ignite. It also burns at a known rate, and the resulting char on the outer layers of wood protects the critical inner layers, ensuring structural integrity for the duration required. This allows mass timber products to be left exposed and still achieve a fire-resistant rating.  

The RSC project team worked closely with the design team to achieve the required fire ratings while maintaining constructability and the budget. Most of the wood-to-wood connections used concealed plates and fasteners covered by wood plugs, eliminating the need for steel fireproofing. The team also worked closely with a third-party vendor to provide an Engineering Judgement for intumescent sealant at more complex mass timber connections. 

MOISTURE MITIGATION 

A key to a mass timber structure’s durability is keeping it dry. While the mass timber components of the RSC were ultimately fully enclosed by the exterior skin, the team developed a temporary protection plan to prevent water instruction and mold prior to building dry-in. Measures included applying a protective undercoat to all wood members at the fabrication facility prior to shipping to protect the wood from UV degradation and moisture absorption. This was reapplied as needed throughout construction when the wood was field-cut, sanded or repaired. Components were also individually wrapped using plastic-coated paper covering, which was maintained throughout construction. Just-in-time delivery minimized on-site storage and moisture exposure risks and daily inspection of all mass timber members prevented damage from standing moisture. 

FABRICATION 

The geometry of the exterior grid shell on the RSC presented challenges in accommodating structural requirements, architectural appearance, constructability possibilities and fire protection constraints. 3D modeling and detailing provided the mass timber design-build contractor, WS Klem, with precise work points for layout of glulam columns and CLT edge geometry. After fine tuning placement and expectation for tolerances, the team modeled the glulam beams and fabricated hardware of thousands of one-off components produced by multiple suppliers.  

Once models were coordinated and shop drawings were reviewed and approved, the team began producing hundreds of glulam and CLT panels. Each beam, column, CLT panel and piece of hardware was unique, requiring extensive quality control to minimize the possibly for field modifications. The mass timber fabricator test-fit all wood-to-wood and steel connections at their facility before shipping to the jobsite, enabling adjustments to be made in the shop and avoiding installation delays. 

INSTALLATION 

The mass timber and glazing scopes were both prefabricated offsite, meaning everything needed to be erected to the tolerances that were agreed to in the modeling phase. Layout information was provided to the field team to ensure the placement of the mass timber would align with those agreed work points. The diligence in preconstruction and quality control paid off and the system was erected with zero rework in the field, despite a highly complex, curved façade with a composite structure consisting of mass timber, concrete and steel. 

Utilization of design-assist trade partners contributed greatly to the success of the project. During the procurement of the mass timber components, 51�Թ� integrated WS Klem into the design-build team. This allowed 51�Թ� to visit key suppliers to better understand the supply chain and ensure the implementation of quality control measures.  

The success of the RSC building highlights the possibilities and opportunities of mass timber. With a few additional considerations from traditional steel and concrete, mass timber is a viable and appealing solution to a more sustainable future in design and construction. 

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• 5 among ENR’s Domestic Heavy Contractors
• 6 in Transportation Contractors
• 13 in ENR’s Telecommunications Contractors
• 19 in Domestic Building/Mfg
• 20 in Top Contractors by New Contracts

Explore our project portfolio to see these efforts in action.

Domestic Heavy Contractors

Ranking #5 among ENR’s Domestic Heavy Contractors demonstrates our deep competencies in heavy civil infrastructure. With the successful completion of projects like the South Fort Collins Water Treatment Plant expansion and the Kaneohe / Kailua Tunnel Influent Facility, we showcase proven success in handling large-scale, technically demanding scopes within budget and on time. This standing reinforces Hensel Phelps as the go-to expert for public infrastructure construction.

Transportation

Earning #6 in Transportation Contractors reflects our excellence in delivering infrastructure from airport terminals to transit facilities. Our work on builds such as the Delta Sky Way program at LAX, the WMATA Andrews Federal Center Bus Garage and Tampa International Airport’s Airside D expansion demonstrate a unique blend of reliability, client collaboration and campuswide integration, propelling communities forward and strengthening our positioning in the aviation and transit transportation sectors.

Telecommunications

Securing #13 in ENR’s Telecommunications Contractors list positions Hensel Phelps squarely among the leading innovators in the mission critical sector. In an era defined by soaring data flow, AI optimization and digital infrastructure demand, our capacity and expertise allow us to execute projects that are not just large, but also technologically complex, secure and energy efficient. The mission critical sector work we have performed across the United States in hubs such as in Wyoming, Arizona and Washington highlight our capabilities in advanced data and connectivity infrastructure, serving the backbone of the digital economy.

Top Domestic Building/Mfg. Revenue

As #19 in Domestic Building/Mfg, we demonstrate consistent and high-impact performance in complex vertical builds. Our integrated delivery model, strong BIM and VDC adoption and stringent quality controls enable cost-effective project execution. Key facilities like the May Lee State Office Complex and the showcase our leadership in advanced manufacturing and high-tech construction.

Top Contractors by New Contracts

Ranking #20 in Top Contractors by New Contracts signifies our forward momentum and winning growth strategy. Driven by repeat clients and expanding market trust, it confirms our ability to secure and deliver high-value engagements across verticals. Our many award-winning projects demonstrate how we’re converting trusted partnerships into strategic wins at scale.

ENR 2025 Rankings

These ENR 2025 rankings exemplify Hensel Phelps’ strategic investments in innovation, integrated delivery and project excellence. Whether your focus is water/wastewater, mission critical facilities, aviation or transportation infrastructure, our expertise is market-proven and recognized at the top.

Explore our project portfolio to see these ENR-recognized capabilities in action and discover how we can build success for your next venture.

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Longstanding Partnership with OSHPD/HCAI Leads to Early Project Turnover

Our decades-long collaboration with California’s healthcare authority–formerly OSHPD, now HCAI–began with the UC Irvine Douglas Hospital, the state’s first large-scale design-build hospital. Under seismic safety pressures, we pioneered a permitting strategy with a dedicated OSHPD expediter, accelerating approvals and setting a new precedent. We’ve since applied that expertise to complex programs like Harbor-UCLA Medical Center and Rady Children’s Hospital, where our deep familiarity with HCAI staff and processes helps avoid permit delays and cost overruns, delivering high-impact medical facilities across the state.

University of California, Irvine Douglas Hospital

51�Թ� has demonstrated an unparalleled ability in the management and delivery of this complex project. The results of these efforts ensured that all cost, quality and schedule requirements were achieved and, in many cases, enhanced. They have been and continue to be one of the best contractors I have ever worked with. Their attention to detail both in the field and in the office leaves very little for me to be concerned about in my day-to-day responsibilities.”

Rebekah G. Gladson, FAIA, AUA, former Associate Vice Chancellor and Campus Architect at UCI Design and Construction Services

Kaiser Permanente Orange County-Anaheim Medical Center

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Innovative Sustainability Practices Transform Healthcare Design and Construction

51�Թ� has consistently integrated advanced sustainable design and construction practices into its projects, aiming to minimize environmental impact while enhancing the quality of healthcare facilities. Notably, UCI Health – Irvine exemplifies this commitment. As the first medical campus in the U.S. to operate entirely on an all-electric central utility plant, it aims to transform the healthcare industry in sustainability and climate-conscious innovation. Similarly, the Kaiser Permanente San Diego Medical Center stands as one of the most energy-efficient full-service hospitals globally. These projects underscore 51�Թ�’ dedication to advancing healthcare infrastructure that aligns with environmental stewardship and community well-being.

UCI Health – Irvine

The UCI Health – Irvine campus will undoubtedly have a dramatic impact on the delivery of exceptional healthcare in Orange County. We couldn’t ask for a better partner than the 51�Թ� + CO Architects team to deliver this meaningful project for UCI, UCI Health and the whole region.”

Brian Pratt, AIA, DBIA, LEED AP, Assistant Vice Chancellor and Campus Architect of Design and Construction Services

Kaiser Permanente San Diego Medical Center

I will forever sing the praises to the outside world of how great 51�Թ�’ work is and how much of a pleasure it was working with you.”

Judy Brooking, SFA at Kaiser Permanente

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51�Թ� has delivered over 30 projects, amounting to over $1 billion across multiple NNSA sites supporting this mission. These projects include laboratories, nanotechnology facilities, educational facilities and utility and systems upgrades, all of which support national security and DOE standards. Below is a look at some of these projects and how they’re supporting the DOE and NNSA’s mission.

Los Alamos National Laboratory

51�Թ� has constructed over $550 million at Los Alamos National Laboratory (LANL), ranging from office buildings, laboratories and campus infrastructure.

TA-15 Dual Axis Radiographic Hydrodynamic Test (DARHT) Vessel Repair (DVR) Facility

The weapons programs at Los Alamos have one principal mission: ensure the safety, security and effectiveness of nuclear weapons in our nation’s enduring stockpile. One critical component of this mission is DARHT, the Dual-Axis Radiographic Hydrodynamic Test facility. This facility provides a dedicated space for the lab to clean out and maintain vessels supporting the overall DARHT program. The vessels contain explosive experiments that help maintain the safety and effectiveness of nuclear weapons.

TA-50 Transuranic (TRU) Liquid Waste (TLW) Facility

The Transuranic Liquid Waste facility addresses radioactive liquid generated from LANL’s plutonium facility. Constructed under the Nuclear Quality Assurance (NQA)-1 program designation, the building houses process equipment, influent storage areas, chemical storage areas and a drum preparation area.

Oak Ridge National Laboratory

51�Թ� was recently awarded two projects at the Oak Ridge National Laboratory.

Stable Isotope Production and Research Center (SIPRC)

The 64,000 SF SIPRC establishes the capability to produce stable isotopes on a large scale to meet the Nation’s continually increasing demands for isotopes needed in medicine, industry, science and national security, thus reducing U.S. dependence on foreign suppliers. The United States has had no existing domestic broad-scope enrichment capability since 1998, and its stockpiles of isotopes produced prior to that are being depleted.

Second Target Station (STS)

Oak Ridge National Laboratory (ORNL) is upgrading its Spallation Neutron Source (SNS) by adding a second target station to provide transformational new neutron capabilities to advance scientific discovery and solve emerging societal challenges. STS will extend and complement the neutron capabilities of the existing SNS First Target Station and the ORNL High Flux Isotope Reactor. 

Sandia National Laboratories

With over $160M delivered to Sandia National Laboratories, 51�Թ� has been active on the Albuquerque, NM campus for over two decades.

Power Source Capability Facility

The new facility supports Sandia’s Power Sources Technology Group, which focuses on nuclear deterrence and managing the lab’s energy portfolio, including working in grid storage and battery safety. The 135,000 SF building replaces a 100-year-old facility and includes a mix of laboratory, office and other support space.

Pantex Plant

51�Թ� has been active on the Pantex Plant site in Amarillo, TX, since 1984, delivering over $175M in projects.

Pantex High Explosive Science & Engineering (HESE) Facility

The HESE Facility provides NNSA with the ability to perform computational and experimental research and to develop diagnostic tools for the evaluation, manufacturing support, surveillance, prototyping and testing of high-explosive materials. Construction consists of three structures – a high explosives lab facility, an equipment and staging storage facility and a technology development and deployment lab – with associated weather-proofed ramps to replace aging facilities.

Consolidated Nuclear Security (CNS), Burns & McDonnell (BMcD) and 51�Թ� collaborated seamlessly to revise drawings, minimize project impacts and allow construction to proceed on track.

Katy Beyer, BMcD, Onsite Project Engineer. 

Lawrence Livermore National Laboratory

51�Թ� has completed four projects at Lawrence Livermore National Laboratory (LLNL), a nuclear weapons design laboratory with responsibilities in nuclear stockpile stewardship.

B223 Polymer and Engineering Building / B224 Office Building

These two buildings are part of the first Applied Materials Engineering area plan developed by LLNL and NNSA to support stockpile stewardship.

B225 Manufacturing Science Facility

The new 16,000 SF facility at LLNL houses equipment to support the polymer production mission. The facility provides an open, flexible floor plan with the capability to reduce the nuclear weapon component design and build time in support of NNSA’s W80-4 Life Extension Program (LEP) and W87-1 Modification Program requirement.

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Wellington Water Treatment Plant Expansion

One of our recently completed project achievements is the award-winning $35 million Wellington Water Treatment Plant Expansion. This project was crucial for supporting the Town of Wellington’s infrastructure, more than doubling its capacity from 2 million gallons to 4.2 million gallons per day. 51�Թ� installed 6,500 feet of buried pipe and 2,500 feet of interior pipe. We also placed 680,000 pounds of rebar and 4,000 cubic yards of concrete, all while coordinating with 35 subcontractors. The expansion ensures Wellington can provide clean drinking water for its community and accommodate future growth.

Town of Windsor Wastewater Treatment Facility

Another notable project is the $17 million Town of Windsor Wastewater Treatment Facility – Biosolids Management Improvements Project. The Town of Windsor was experiencing rapid growth, which increased the demands for its biosolids handling system. The existing equipment was aging and inefficient, leading to operational challenges. Our project included the construction of new aerobic digesters and dewatering facilities, which relieved capacity constraints, met future biosolids handling needs, and reduced operating costs. As a result, Windsor now fills one truck with dewatered biosolids every three weeks, reducing truckloads by 93% annually and significantly lowering the carbon footprint and safety risks.

Our success on the Biosolids Project led to winning the next phase of work at the site: the approximately $120 million Windsor WWTF Liquids Expansion. This project will expand the facility’s capacity to treat 6.3 million gallons per day, ensuring that Windsor can meet environmental standards and support its growing population. Our success also led Windsor to award 51�Թ� the $16 million Headworks project, which will upgrade the existing facility and construct an adjacent Headworks facility to increase capacity. The new facility will house the new grit concentrators and fine screen effluent channels, as well as the new electrical and mechanical rooms.

Kailua Regional Wastewater Treatment Plant

Our successes in the water sector led us to Hawaii, where 51�Թ� took on the $149 million Kailua Regional Wastewater Treatment Plant (KRWWTP) project. The project consisted of multiple critical facilities, including the Tunnel Influent Pump Station (TIPS), Mini Kailua Influent Pump Station, Generator/Electrical Distribution Building, Fuel Tank Pad, Headworks Facility, Sewer Pump Station and Force Main.

This comprehensive project also involves extensive utility and drainage system improvements. As part of the Kaneohe/Kailua Sewer Tunnel Project, it aims to efficiently convey wastewater flows from the Kaneohe Wastewater Pretreatment Facility to the KRWWTP, providing essential storage for peak wet-weather flows and mitigating overflow risks. The project won the 2019 GCA Build Hawaii Award.

Kaneohe/Kailua Tunnel Influent Facility

Staying in Hawaii, the Kaneohe/Kailua Tunnel Influent Facility, constructed at the Kaneohe Wastewater Pre-Treatment Facility, represents the third and final phase of the City and County of Honolulu’s Kaneohe-Kailua Wastewater Conveyance and Treatment Facilities project. The $21 million project comprised a 61,991-square-foot endeavor, including developing a new generator, electrical building, odor control facilities, and connecting underground pipelines and utilities. The facility boasts a complete, functional process control system (PCS) encompassing the supply, installation and calibration of the control system network, instrumentation and signal systems. The project also involved comprehensive structural finishing, mechanical, architectural, electrical and instrumentation work at diversion, drop structures, and junction structures for the new conveyance tunnel.

To comply with a U.S. EPA consent decree, 51�Թ� played a crucial role in the tunnel work, installing fiberglass to seal ports and joints. This project, completed in 2018, earned the City and County of Honolulu the prestigious 2019 American Council of Engineering Companies People’s Choice & Grand Conceptor Award.

Waianae Wastewater Treatment Plant

As a focal point in the construction industry of Hawaii, 51�Թ� constructed the $16 million Waianae Wastewater Treatment Plant (WWTP) project. The project involved the construction of a new No. 2 non-potable water (2W) piping network with isolation valves, rehabilitation of primary clarifiers and influent/effluent distribution boxes and piping, 2W seal water system improvements, new headworks influent screens and washer/compactors and modifications to the grit removal system and pre-aeration tanks. 51�Թ� self-performed 75% of the work, including concrete repairs and installation, demolition, air ductwork, soil erosion and sediment control, electrical site work, temporary diversion pumping, and the start-up, testing and commissioning of systems. Although the main project has concluded, 51�Թ� continues work at Waianae WWTP under a separate contract to replace the biosolids dewatering system.

Kuna East Water/Wastewater Infrastructure Project

Another project that wrapped up in 2024 was the $99 million Kuna East Water/Wastewater Infrastructure Project (WWIP) in Kuna, Idaho. This 182-acre development was built to support the East Kuna Industrial Overlay District, including the Kuna Data Center campus. The project required extensive mass excavation to accommodate a new 2-million-gallons-per-day water system featuring potable wells, a booster pump station and a 2-million-gallon storage tank. It also included a wastewater system capable of processing 270 gallons per minute through lagoons, lift stations and a reuse system that safely returns treated water to the environment. Designed with future expansion in mind, this scalable and sustainable infrastructure supports long-term industrial growth in the region.

Water Construction Forecast

A recent highlighted that at least $630 billion will be needed to improve wastewater, stormwater and other clean water infrastructure over the next 20 years. With more than 16,000 wastewater treatment plants in the U.S. operating at an average of 81% capacity and 15% exceeding their design capacities, the need for infrastructure improvements is clear.

In addition, we were recently awarded the preconstruction contract for a project in the Rocky Mountains to remove per- and polyfluoroalkyl substances (PFAS) from the local drinking water supply. This project is critical due to a , known as “forever chemicals.” This project is among the first of its kind in Colorado and underscores our capability to tackle complex and pioneering initiatives.

51�Թ� is dedicated to addressing these challenges and providing innovative solutions to ensure a sustainable future for water. Paired with our ability to manage complex projects in the water and wastewater sector, clients can trust that we can be the perfect partner for the future of water infrastructure.

To learn more about our Water 51�Թ� and who to contact for project development, visit us here: /contact-us/water/.

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