Environmental services company Lemna operates through two main business units. Lemna Technologies provides treatment and floating cover systems for municipal and industrial wastewater lagoons. Its offerings include a biological process that treats wastewater with minimal maintenance. Lemna Technologies has installed more than 200 systems across the US. The company's Lemna International unit designs a variety of infrastructure projects, including renewable energy generation facilities and water and wastewater treatment systems. It has designed and built more than 300 projects in 16 countries. Lemna was founded in 1983.

Heavy construction firm Ranger Construction Industries builds and resurfaces roads and parking lots in the Sunshine State. It also operates asphalt plants and a large fleet of excavation, grading, and asphalt equipment. The company's Ranger Golf division provides golf course construction and renovation services, including mass excavation, shaping, and turf services, throughout the US. Ranger Construction Industries is a subsidiary of Florida-based Vecellio Group, one of the largest transportation contractors in the US.

Rocky Top Building Products produces pressure-treated lumber and engineered wood for residential, commercial, agricultural, industrial, marine, and recreational applications. The company's products include dimension lumber, decking boards, railing, beams, lattice, and related fastening systems. The company operates facilities in Maryland, Pennsylvania, and Virginia, and sells its products to professional builders and do-it-yourselfers through dealers in about a dozen northeastern and mid-Atlantic states. A wholly owned subsidiary of the Franklin Group, Rocky Top was established in 1977.

SierraPine specializes in composite and wood construction products. The priately-owned company manufactures and distributes medium-density fiberboard (MDF), particleboard, and moulding products. Formaldehyde-free products are sold under the Encore, Arreis, and Medex brands. SierraPine also distributes Carter Holt Harvey and Daiken composite products from Australia and New Zealand. SierraPine has plant and sales operations in California, Georgia, and Oregon. The company has the capacity to produce up to 1 billion sq. ft. of composite panels annually. However, demand for construction products fell during the recession and SierraPine was forced to scale back operations in 2009.

Southland Industries is one of the largest construction and engineering companies in the US. The employee-owned group provides design/build, electrical and mechanical engineering, electrical maintenance, plumbing, fire protection, HVAC, and facilities management services. Southland offers custom solutions for clients in the health care, life sciences, hospitality, industrial, education, government, and telecommunication sectors. Projects include the renovation of the Pentagon following the terrorist attacks of September 11, and the M Resort in Las Vegas. Founded in 1949, Southland Industries has about a half-dozen offices in California, Maryland, Nevada, and Virginia.

AC Martin Partners get a charge out of engineering projects. The design firm provides architectural and engineering services in California to clients such as corporations, developers, churches, educational institutions, and government agencies. Its portfolio includes a new 75,000 sq. ft. Segerstrom Science Building at Azuza Pacific University, Our Lady Queen of Angels church in Newport Beach, and the Merle and Melanie Fish Interfaith Center at Chapman University. AC Martin operates from offices in Los Angeles and Sacramento. Albert C. Martin Sr. founded the company in 1906. His grandsons, Christopher and David, co-chair the company today.

China Dredging Group isn't interested in digging up the past. It's focusing on the future as a public company and a provider of dredging contracting services designed to keep China's waterways clear and navigable. Operating through Chinese subsidiary Fujian Service, the group is a British Virgin Islands incorporated company that was formed in 2010 and subsequently filed to go public. With engineering and project management expertise, its services cover onsite inspection, cost estimation, sediment and obstruction removal, and transport and disposal of dredged material. It typically serves as a subcontractor for large, state-owned enterprises that act as general contractors on port infrastructure projects.

Hanafee Bros. Sawmill specializes in red oak and white oak lumber products. It also produces lumber from a broad range of other hardwood species, including ash, sycamore, cottonwood, elm, poplar, sassafras, walnut, hackberry, sap gum, and more. The company sells its products to furniture and cabinet makers, flooring manufacturers, and makers of stair parts, moldings, and other items. Export clients comprise more than half of its business. Hanafee Bros. Sawmill's hardwood lumber operations, which have been family-owned since 1906, operates from the Obion River valley in northwestern Tennessee. President Donald Hanafee Jr. owns and operates the company.

Scandinavia's largest construction and property development group, Skanska provides building, financing, development, and management services for commercial, residential, and civic projects in Europe, the US, and Latin America. Its areas of expertise include office buildings, industrial plants, single- and multifamily residences, hospitals, bridges, and highways. Its US divisions include Skanska USA Civil and Skanska USA Building. The group has completed work for clients such as Boeing, IKEA, Volvo, and PETROBRAS. Skanska was founded in 1887.

Kohn Pedersen Fox Associates (KPF) puts its stamp on buildings around the world. One of the top 10 architectural and planning firms in the US, the company offers services such as master planning, urban design, space planning, programming, building analysis, graphic and product, and interior design. It specializes in such projects as corporate headquarters, government offices, health care facilities, hotels, and educational facilities. KPF's structures range from small pavilions to entire cities. The firm operates from offices in New York, London, and Shanghai. Architects A. Eugene Kohn, William Pedersen, and Sheldon Fox founded the firm in 1976.

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