Electromagnetic (EM) methods can detect buried metallic objects, from those as small as unexploded ordnance (UXO) and metal debris, to larger buried tanks and drums.  Buried drums may be detected as deep as 15 feet below surface. Other common applications include mapping landfills, locating distributed buried debris associated with contaminated sites, and finding metallic utilities like buried pipes.  These tools can locate both ferrous and non-ferrous metal objects and are relatively insensitive to noise sources - both of which may be problematic for magnetometers. Logic Geophysics uses the Geonics EM61-MK2A, an industry-leading, high-resolution metal detector in conjunction with Golden Software's Surfer software to process, analyze, and display data for interpretation.  We also are offering services in the role of project geophysicist for the new USACE requirements for characterization of UXOs at U.S. military sites.

Advantages:
Rapid investigations, reducing cost compared to other tools and techniques
Non-invasive and non-hazardous
Detects ferrous and non-ferrous metal, unlike magnetometers
Provides depth estimates for targets, which magnetometers do not

Underground Storage Tanks

Underground storage tanks make an ideal target for geophysical metal detectors.  We've used the EM61-MK2A both to locate buried tanks and to verify that tanks have been removed from a site.  With proper data acquisition and processing, this tool can often delineate tank boundaries and estimate depth of burial and size.

Environmental Sites

We've used metal detectors to delineate buried metallic objects at sites including landfill, military bases, and personal residences.  This method is ideal for locating buried drums, especially where cultural or environmental "noise" prevents effective use of magnetometers.  At remote sites in Alaska, we've processed and interpreted the data on-site to support concurrent site investigations.  We can remain on-site to minimize mob/demob costs during debris removal and then resurvey to provide evidence that the site has been cleared of buried metal debris.

Unexploded Ordnance (UXO)

For many years, metal detectors such as the EM61-MK2A and others have been used to identify UXOs at sites across Alaska, North America, and the world. In the last decade, in conjunction with an Army Corps of Engineers research program, new tools and data-processing software such as Oasis Montaj's UXO-Land and UX-Analyze packages have demonstrated increased UXO location accuracy while reducing "false positives" and corresponding dig time and expense. Logic Geophysics has the expertise and experience to implement these tools to support UXO removal and minimize remediation cost.