AMEC buys MACTEC for $280 million

International engineering and project management company AMEC plc bought Alpharetta, Ga.-based engineering and environmental services company MACTEC Inc. for $280 million.MACTEC has about 2,600 employees and 70 offices and offers services similar to London-based AMEC��s Earth & Environmental (E&E) business, including environmental planning, assessment and remediation, infrastructure engineering, water resources and construction support services.The combined E&E business will be based in Alpharetta and led by Hisham Mahmoud, president of AMEC��s E&E…