Electromagnetic Conductivity (Metal Detection) Surveys Conducted Nationwide
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Electromagnetic Conductivity (EM) (Metal Detection) Survey Services
All surveys conducted by:
Electromagnetic Conductivity (EM) & Metal Detection
Electromagnetic conductivity (also known as terrain conductivity) measures the conductivity of the subsurface which includes soil, groundwater, rock, and objects buried in the ground. GeoModel, Inc. has conducted numerous electromagnetic conductivity (EM) surveys nationwide and worldwide using EM instruments for various applications.
Electromagnetic conductivity (terrain conductivity) surveys are rapid and very accurate. The EM instruments are easily carried or moved around the site and are used for a variety of purposes. Underground metal petroleum tanks can be located, metal underground utility pipes can be detected, contaminated groundwater can be mapped, and clay units can be identified.
GeoModel, Inc.'s geophysicists can perform an EM survey anywhere in the world and with short notice. Survey costs are reasonable.
Applications of Electromagnetic Conductivity (Terrain Conductivity):
The color-contoured image (GeoModel Map) to the right was obtained using electromagnetic conductivity with GPS.
Electromagnetic Conductivity (EM) (Terrain Conductivity) Surveys:
Above are the shallow EM conductivity meter (white pole), the deeper EM conductivity meter (hoops), and GeoModel, Inc.'s EM metal detector being hand-towed
The instruments shown above can locate buried trenches, landfills, and inorganic or salt plumes. The regular EM conductivity meter locates metal and measures ground conductivity to a depth of about 20 feet (6 meters). The shallow EM metal detector locates metal to 10 feet and can more accurately define the metal target locations than the regular EM conductivity meter. The deeper EM conductivity meter can measure ground conductivity to 100 feet (30 m). The EM conductivity instruments are excellent for locating inorganic and salt plumes from landfills and waste pits.
GeoModel, Inc. uses the new EM metal detection system which is twice as accurate as the standard EM metal detection system.
Subsurface Features and Site Conditions Investigated Using Electromagnetic Conductivity
GeoModel, Inc.'s professionals have successfully used Electromagnetic Conductivity methods to locate and delineate horizontal and vertical extents of buried metal (including utilities), sinkholes, landfill leachate, saltwater plumes, fracture zones, metal reinforced foundations, archaeological sites, and other surface and subsurface features and conditions.
Three EM examples are shown below. The yellow, orange, pink,and red colors represent increasingly higher levels of terrain conductivity and the green and blue shades correspond with diminishing levels of ground conductivity (blue being at or close to background, neutral pH, freshwater, or native conditions).
Results of the EM survey shown as a "Site Scan Map" or "GeoModel Map" ********Below is an aerial photograph of the site with the EM results (from below left) superimposed onto it.
Underground Metal Utility Location Surveys
GeoModel, Inc. can create a color-contoured GeoModel Map underground scan of your property, using EM and metal detection instruments and computer processing to create a full color contour map showing areas of buried metal utilities, pipes, drums or tanks (USTs), burial trenches or landfills containing metal, or inorganic contamination.
Color-contoured GeoModel, Inc. GeoModel Map (above left) and site map (above right) showing locations of metal and conductive pipelines in the same area as on the left
For a GeoModel Map, mapping is done automatically using a vehicle or ATV driven system or a hand-carried method, with GPS positioning. Results can be obtained in a short time period, making our system cost-effective for large industrial sites, as well as for smaller sites. Metal utility lines, and most other conductive or electrical utility lines, are mapped using our unique technique.
Truck-Mounted Shallow Pipeline Detection System (On Left) and Shallow EM Metal Detection Signal Transmission into the Subsurface (On Right)
Above left is a photo of the truck-mounted 18-foot (6-meter) EM conductivity meter and above right is a representation of the EM response to a buried metal pipeline
Buried Drums, Tanks, and Other Features
EM results (below left) at a site where steel drums were buried in concrete vaults. ********Below right are USTs, associated piping, and other buried metal pipes.
GeoModel, Inc. was founded in 1991 as a geophysical survey services and environmental consulting firm. The company principals have over 50 years of combined experience in the geophysical surveying and environmental field and have conducted numerous electromagnetic conductivity (terrain conductivity) surveys worldwide. All projects are conducted by registered professional geologists.
GeoModel, Inc. conducts surveys in every state.
Contact us to check the availability of a crew in your state.
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