Philip Services Corporation (PSC) undertakes a wide range of industrial and environmental cleanup projects throughout the US, Mexico, and Canada. Besides scrap metal recycling services, which have been the company's longtime focus, PSC provides on-site waste disposal and recycling, cleaning of industrial equipment, transportation of commercial and industrial waste, and emergency response to spills. In addition, PSC alos offers oil field services both onshore and offshore along the US Gulf Coast. Entities owned by investor Carl Icahn control PSC. The initials PSC also stand for the company's operating philosophy -- People, Safety, and Commitment.

Kingspan is busy spreading its wingspan in the energy-efficient and insulation building materials business. The company is also a top supplier of raised flooring. Other products include steel and wooden frames, rigid building insulation, insulated cladding panels, and structural products. Kingspan also makes environmental containers such as rainwater collection systems and oil, water, and septic tanks. The company operates mainly in Europe, but also has facilities in Asia and North America. Kingspan has grown through numerous acquisitions, including its 2011 purchase of CRH's European insulation business.

Tetra Tech EM, a subsidiary of Tetra Tech, provides environmental engineering and consulting services to government and commercial customers. Environmental consulting areas of expertise include site cleanup and restoration, hazardous waste management, air quality, water resources, regulatory permits and compliance, natural resources management, energy management, and environmental management systems. The company, which was established in 1982, also offers management consulting services such as strategic planning and analysis, graphic and production services, communication and conference facilitation, and information management.

Panther Technologies is on the prowl in the Northeastern US, providing its industrial clients with heavy-duty cleaning and maintenance services, such as soil and groundwater cleanup, pneumatic conveyance, liquid vacuuming, high-pressure water washing, and sludge pumping. The environmental services firm also provides aboveground storage tank and underground storage tank cleanings and removals, plant decontamination and demolition, and other facility support services. Panther Technologies has completed more than 1,000 major projects since its founding in 2000.

GSH Group's services are centered around saving energy. The company provides such services as building engineering and maintenance that help facilities improve energy efficiency and emissions control. It does mechanical and electrical work, installs HVAC systems, refurbishes roofing and drainage systems, and offers water quality treatment and equipment. The group serves clients in the financial, industrial, leisure, pharmaceutical, retail, and telecommunications markets; they include IKEA, Pfizer, and T-Mobile. Land Securities is among its public-sector clients. Named after founder George Scarr-Hall, GSH Group is still owned by members of the Scarr-Hall family and has operations in the UK, Europe, and the US.

American Pan & Engineering Co. has its hand firmly planted in concrete. The privately-held specialty contractor, which does business as APEC, offers concrete formwork for commercial buildings in the southeastern US. The firm is involved in such construction projects as condominiums, hotels, and hospitals (the latter brings in about half of its annual revenue), as well as parking decks, office buildings, and schools. It has done work on Florida Memorial Hospital; Rosen Hotels and Resorts' Shingle Creek resort and convention center in Orlando; and science and engineering buildings at Georgia Institute of Technology. Founded in 1995 by president BJ Jarun, APEC has offices in Florida, Georgia, and Texas.

GLY Construction specializes in TLC for commercial construction and sings its praises throughout Washington's Puget Sound region. The firm, which was founded in 1978, has built corporate facilities and distribution centers for the likes of Microsoft, Adobe, Nintendo, Overlake Hospital, and Boeing. The company's heating, ventilation, and air conditioning (HVAC) operations began in 1993 when one of its subcontractors entered into bankruptcy. GLY Construction is owned by its nine principals, including company president and CEO Lee Kilcup.

Chas Roberts isn't just the name on the door. Chas and Alice Roberts founded Chas Roberts Air Conditioning in 1942. The business has been family owned and operated since day one.Prior to founding the business, Chas worked as a serviceman for the local utility. In the early years, sales consisted of home appliances, coolers, furnaces, air conditioners and service. In the 50s and 60s, the company grew doing retrofits of houses with coolers to air conditioners, new installs in custom and tract homes and light commercial air conditioning. Chas Robert's son, Chuck, took over managing the company in the 60s and provided the vision for future growth.

Berglund Construction rebuilds crumbling facades. The century-old company specializes in the restoration of stone, concrete, masonry, and curtainwall structures. Berglund works to preserve some of the Midwest's architectural gems including schools, art museums, churches, and office buildings. The company, which mostly works in Illinois, Indiana, Wisconsin, and Ohio, also offers new construction and building services. Past clients include the University of Chicago, Northwestern University, Draper and Kramer, and Andrew Corporation. The company was founded as a masonry maintenance business in 1911 by Fred Berglund. His grandson (and namesake) now runs Berglund.

Leighton Holdings provides engineering and construction services for mining, infrastructure, commercial, and environmental projects in Australia, the Asia-Pacific region, and the Middle East. Typical contracts include the maintenance and construction of pipelines, mines, highways, tunnels, and commercial buildings. The group's largest subsidiaries are mining, construction, and services firm Thiess and project management firm Leighton Contractors. The 45%-owned Al Habtoor Leighton division, formed in 2007, is one of the largest construction contractors in the booming Gulf region. Leighton also develops real estate and offers facilities management services. German construction firm HOCHTIEF owns 55% of the group.

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