DWG Associates - Design engineering, field services, and software for wastewater and water treatment plant engineers and owners; specializing in processes using oxygen or ozone gas, located in Marietta, Georgia. - http://www.dwgassociates.com/
Remtech Engineers - Specializes in soil and groundwater site remediation engineering, contracting, and equipment manufacturing with over 25 years experience on over 2,000 cleanups, located in Marietta, Georgia. - http://www.remtech-eng.com/