Certerra Subsurface is an innovative, solutions oriented geophysical consulting and service provider to the environmental, engineering, groundwater, mining, oil & gas, and natural resource exploration industries. We specialize in the application of 3D geophysical methods for time lapse subsurface characterization and monitoring of fluid flow through geological materials. Additionally, HGI is a leader in providing Leak Location and Leak Detection & Monitoring in geosynthetic lined ponds, landfills, and heap leaches using electrical methods.