During his career, he has become a recognized national expert in the design, permitting, and construction of liner and cover systems for municipal, industrial, mine, mill, and hazardous waste containment facilities. This design and construction experience includes more than 120 disposal cells, final covers, and liquid impoundments, including mill tailings and mine water, at sites throughout the United States and the world. In addition, he is experienced in the application of remediation technologies such as vapor barriers, soil vapor extraction, dual phase extraction, pump and treat, excavation and removal, chemical oxidation, bioaugmentation, and natural attenuation. He has applied these remediation technologies at more than 75 locations around the world, many as part of brownfields site redevelopment initiatives.
To advance the state of the practice in the area of brownfield and closed landfill site redevelopment, Greg is the co-developer of a patented system designed to detect and control migration of subsurface gases into buildings. Greg serves on several American Society of Testing and Materials (ASTM) D35 subcommittees for preparation and approval of ASTM standards and test methods relating to geosynthetic materials.
Greg is a registered professional engineer in five states with a California General Engineering Contractors License and a Hazardous Substances Removal Contractors License allowing him to deliver remediation system projects through the design, build, operate process.