Toxic mold and environmental air quality are just two of the concerns of Environmental Health & Engineering. The engineering and health and safety services firm offers consulting services geared towards creating healthier work environments in buildings ranging from large office complexes to suburban schools. Its services range from studies of the effects of pollutant exposure to human health, to risk assessments, to support the commissioning of research laboratories, to advice on federal compliance requirements. In 2009 it was contracted by the Consumer Product Safety Commission to study air quality in homes built using Chinese-made drywall. The group was founded in 1988 by Harvard lecturer Jack McCarthy.

Environmental Resources Management (ERM ) manages, maintains, and meters the resources of Mother Earth. The environmental consulting firm offers site development and remediation services, as well as technical services, for water and wastewater management, air quality assessment, and pollution control. With 137 offices in 39 countries ERM also provides facility operations and merger consulting services, including strategic advice, impact studies, contaminated sites management, and permitting assistance. Clients include Alcoa, Bayer, Del Monte, and Mattel. Bridgepoint Capital controls the company.

Gallegos Sanitation provides collection and hauling of solid waste and recyclable materials in Fort Collins and nearby communities such as Greeley and Windsor. Founded in 1959 by Edward Gallegos and sons Arthur, Gerald, and Rudy, the company is owned and operated by the Gallegos family. The local, minority-owned business was incorporated in 1983.

Geo-Marine displays Marine-like discipline in providing engineering and environmental compliance and remediation services for a wide range of public and private sector clients, including the US government (including the Department of Defense and the Air National Guard). Services range from energy conservation analysis to archeological investigations to the development of radar-based bird-detection systems for aircraft. The firm has undertaken projects throughout North America and in the Caribbean, South America, and Asia. The company, which operates from seven offices across the US, was acquired by Applied Research Associates in 2009.

From testing for toxic mold to cleaning up oil spills, GeoTek Engineering & Testing Services offers an array of environmental engineering services. Services include site assessment, environmental consulting, and laboratory testing. The South Dakota company, which operates primarily in the midwestern US, is not affiliated with Massachusetts-based GeoTek Engineering, Inc.

GeoTrans performs environmental engineering and consulting services, specializing in water and groundwater issues. A subsidiary of Tetra Tech, GeoTrans' helps businesses and government entities maintain the environment while taking care of business. Areas of expertise include environmental regulation compliance; water resource evaluation, planning, and development; solar energy consulting and services; resource optimization; remediation design and optimization; and sustainability strategy and analysis. GeoTrans has clients in the aerospace, automotive, energy, manufacturing, mining, and petrochemicals industries, among others.

GreenShift Corporation, together with its subsidiaries, develops and commercializes clean technologies that facilitate the use of natural resources in the United States. It owns four corn oil extraction facilities in Oshkosh, Wisconsin; Medina, New York; Marion, Indiana; and Riga, Michigan. The company also owns a bio-diesel refinery located in Adrian, Michigan; and an oilseed crushing facility in Culbertson, Montana. GreenShift Corporation sells its corn oil as a feedstock for biofuel production or for direct use as biofuel. The company was formerly known as GS CleanTech Corporation and changed its name to GreenShift Corporation. GreenShift Corporation was founded in 1984 and is headquartered in New York, New York.

GZA GeoEnvironmental Inc., provides environmental consulting and remediation, geotechnical engineering, construction management, and regulatory compliance services through a network of 25 US locations. It also offers air quality monitoring services through its Airlogics partnership, and operates a soil and rock instrumentation division. The company operates Baystate Environmental Consultants which provides civil engineering, natural resource management, environmental permitting, and environmental land planning services across the US.

Handex Consulting and Remediation (HCR) offers a range of the environmental consulting and remediation services including regulatory support, risk management, site assessment, soil and groundwater sampling and remediation, and waste minimization. The company does much of its work for gasoline retailers; customers include the retail arms of Exxon Mobil, and Sunoco. HCR also contracts with government environmental agencies. The company operates primarily in the northeastern and southeastern US. Over the next decade HCR plans to double its revenues, in part by diversifying into other markets.

Heritage Environmental Services, provides a wide range of industrial waste management services. Heritage Environmental Services owns and operates a network of landfill, incineration, chemical treatment, and recovery facilities. The firm treats and disposes of corrosive substances, oils, wastewater, and laboratory chemicals. The company also constructs and operates waste management facilities at customers' sites. Heritage Environmental Services claims to be the largest private environmental company with countrywide capabilities and locations.

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