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ATC Group Services LLC (ATC) is a full-service environmental consulting and industrial hygiene firm operating more than 115 offices nationwide. Over the past...

Based in Oakland, Calif., Northgate Environmental Management Inc. is one of the nation's leading experts, providing professional solutions to environmental problems. The firm offers an array of services, which includes environmental investigations, remediation, groundwater quality and aquifer analyses, water resources and reuse. In addition, it provides air quality, risk assessment, slope stability analysis, construction management and regulatory permitting, hazardous materials investigations and risk assessments. The clients of Northgate Environmental Management Inc. include regional and state governments, developers, insurers and attorneys.