• Detection and delineation of subsurface objects; including drums, underground tanks, vaults, and piping and lines
• Depth to basement
• Direct detection of subsurface contamination (plume delineation)
• Mapping DNAPL’s (Dense Non-Aqueous Phase Liquids)
• Fracture flow assessment
• Location of subsurface permeable pathways
• Pyramid has expertise in many geophysical techniques, including:
• Ground Penetrating Radar
• Electromagnetic Induction (EM)
• Magnetometry
• Borehole Geophysics
• Seismic Refraction and Reflection
• Resistivity Methods

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Geophysical Investigation Case Study

As part of a Phase II environmental Site Assessment, a client needed to determine the location of:

1. Underground piping formerly used to transfer chemicals from outside tanks to the inside of the plant building
2. Underground Storage Tanks
3. A buried lagoon

Pyramid Environmental was requested to design and perform a site specific geophysical investigation of the property. The techniques chosen for the project were Ground Penetrating Radar(GPR) and Electromagnetic Induction (EM). During the preliminary site investigation, a range of equipment configurations and settings were field tested to determine the optimum acquisition parameters.

Buried Piping and Underground Storage Tanks

Initial EM reconnaissance of areas suspected to contain piping and Underground Storage Tanks was performed. Pyramid’s on-site computer capability allowed us to assess the data in less than 24 hours. Based on results of this cost-effective initial survey, areas requiring higher density subsurface data were identified. A combination of closely spaced EM data and GPR profiles were performed in areas of greatest interest and a detailed map of the site was provided to the client.

Buried Lagoon

A grid of GPR profiles was then obtained in the area suspected to contain a buried lagoon. The profiles were designed to provide data across the edges of the lagoon. Results of these profiles were interpreted on the site by a geophysicist, and additional profiles were obtained to adequately define the lagoon edge. The profile data was then incorporated into a map of the lagoon area. The client was Abel to save significant amounts of money by reducing the number of test borings and wells required to analyze the area.