Atomic Energy of Canada Limited (AECL) is not going to split anytime soon. Known for designing and developing the CANDU nuclear power reactor, the company designs and builds nuclear reactors and provides services such as construction management, waste management, decommissioning, and life-extension projects related to CANDU reactors worldwide. It also operates two laboratories for nuclear technology research and development, thanks to partial funding from the Canadian government, which is looking to sell its interest in AECL.

Formed by Charles Shelly in 1938, the company was acquired in 2000 for $362 million by Oldcastle Materials, a unit of Ireland-based CRH. The acquisition helped boost Shelly's growth and now it produces nearly 9 million tons of asphalt each year. The Shelly Company has only scratched the surface of the road paving business. The company, which produces aggregates and asphalt for road surfacing, operates several aggregate facilities and asphalt plants in Ohio. Operations include quarries, sand and gravel pits, fixed and portable asphalt plants, and bitumen terminals. The Shelly Company is also a paving and road construction contractor. Other divisions manufacture cement and and ready mix concrete.

Sidney Cubbage provides a variety of building engineering services, primarily air conditioning, heating, plumbing, refrigeration, and ventilation. Subsidiary Thames Ducting makes and installs ventilation ductwork. Sidney Cubbage's handiwork is most often found in hospitals, leisure centers, schools, and office buildings. Alfred McAlpine, Krispy Kreme, University of Reading, and various county councils are counted among the firm's clients. Sidney Cubbage founded his eponymous firm in 1927; semi-retired chairman Paul Remsbury bought the company along with Rod Harris in 1971.

Italian-Thai Development Public Limited company ain't heavy, but its construction projects are. Italian-Thai Development (Italthai) builds some of the largest infrastructure and civil projects in Thailand and across Asia. Its project portfolio includes work on Thailand's rail system, Bangkok's mass transit development plan, and deep-sea port developments at Pak Bara and Pattani ports. The company has branched out across Asia, specializing in industrial, utility, transportation, and telecommunications projects. Italthai has also invested in energy and mining projects. Chaijudh Karnasuta (from Thailand) and Giorgio Berlingieri (from Italy) co-founded the company in 1958.

Rumpke Consolidated Companies provides waste collection, disposal, and recycling services for residential, commercial, and industrial customers in Kentucky, Indiana, and Ohio. The company operates eight landfills, 20 transfer stations, and seven recycling facilities. It manages a fleet of 1,700 vehicles. The company's facilities process more than 500 million pounds of recyclables each year. In addition, Rumpke rents portable toilets and repairs and distributes hydraulic components. The Rumpke family owns the company, which was founded in 1932 by William F. Rumpke as a coal and junkyard business. More than 50 Rumpke family members are employed by their namesake company.

Burkett & Wong Engineers has a long history of successful projects. The firm provides a variety of engineering and design services, including structural and civil engineering, surveying, and land planning services throughout the southwestern US. Burkett & Wong's portfolio of approximately 10,000 completed projects includes schools, athletic fields and gymnasiums, libraries, parking structures, condominiums, restaurants, theaters, and more. Its surveying services include boundary, topographical, deed interpretation, and right-of-way. The company has offices in Las Vegas and San Diego.

Everett J. Prescott helps ensure your pipes have integrity. Operating through a diverse family of companies (known collectively as The Prescott Companies), the firm manufactures, distributes, installs, maintains, and tests its lines of water, sewer, gas, and drain materials. Products include pipes, tubes, pipe fittings, valves, and fire hydrants. Red Hen Manufacturing makes brass meter adapters, compression fittings, couplings, and connectors. Meter and Backflow Services reconditions and modernizes water meters. PEP Transportation provides shipping to the continental US and part of Canada. Quality Water Products makes and distributes water, sewer, and drain utility products.

WorthGroup designs and builds commercial gaming, entertainment, and hospitality facilities; sports and recreation projects; retail and commercial buildings; public works; health care and wellness structures; educational facilities; and more. The masterbuilder provides pre-construction, general construction, construction and project management, occupancy analyses, scheduling, and other services. Its client roster includes Native Americans, the University of Nevada (Reno), Ironhorse Village Condominiums, Blue Sky Casino and Events Center, Bull Durham Casino, Circus Circus (Reno).

Sacyr Vallehermoso, S.A., operates through the following divisions: Sacyr (construction), Vallehermoso (real estate development), Testa (real estate property management of office, retail, and warehouse space), and Valoriza, which sells water through a variety of subsidiaries and is involved in solar and wind energy and environmental operations as well as street cleaning and urban garbage collection. Sacyr Vallehermoso provides construction and infrastructure services under the Somague name in Brazil and Portugal.

J.F. White Contracting has been at the bedrock of heavy civil construction in New England for more than 85 years. The group has civil, design/build, mechanical, electrical, and deep foundation divisions to provide a large range of engineering, construction, infrastructure, and equipment and wiring installation services. J.F. White also has a diving division that specializes in marine construction and underwater engineering. The company has worked on projects for Harvard University and was involved in building Boston's Central Artery/Tunnel project. J.F. also was tapped to rebuild the Chelsea Street Bridge -- a $125 million project funded by stimulus money. It was founded in 1924 by Joseph F. White, Sr.

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