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Environmental Technology Listing
Title of Listing:
Direct Image Soil Conductivity System
Category:
Characterization Technologies
Subcategory:
*Soil, All Listings
Media:
LNAPL, DNAPL, Soil, Sediment, Groundwater
Contaminants:
Soil Types, Resistivity, Conductivity
Web Site:
Email:
Technology Description:

Geoprobe Systems manufactures a soil conductivity sensor probe which can be driven into the ground using percussion type soil probing equipment (dynamic direct push). As the sensing probe is pushed into the soil, a low frequency alternating electrical current is passed through the soil using isolated conductor rings on the probe. Measurements are made of current flow and voltage, allowing calculation of soil conductivity. This value may also be expressed as the inverse, soil resistivity.

          Continuous logs are made of soil conductivity with depth, allowing the user to differentiate soil strata as they are penetrated.

          This probe is unique in its ability to withstand continuous service with percussion driving equipment.

          The signal conditioning and data acquisition system for this device are mounted in a portable case. The system is controlled with a lap top computer. The probe is normally driven into the ground using a Geoprobe type soil probing unit, operating at 30Hz and having maximum combined percussion and static forces of approximately 15,000 lbs. at the top of the probe rod. Monitoring target include brines.
Performance Status/
Limitations:

Performance Status:

          This technology was made available for general use by Geoprobe Systems in early 1994. Since that time it has been used by Ames Laboratories in its Expedited Site Characterization Methods study (1994), and by the US EPA in its SITE demonstration program (1994). The system has also been used by the DOE for subsurface characterization.

          Limitations:

          This technology is applicable only to soils (not rock) and is limited to soil lithology which can be penetrated by percussion type soil probing machines. Thus far, the technology has been used to depths in excess of 70 ft.

          The soil conductivity system is primarily a device for detecting changes in lithology and will detect chemical contaminants only when the contaminants produce a change in electrical response. Thus this sensor has been used to indicate brine contamination which increases ionic activity in the soil. Users have also reported observing decreased electrical conductivity in zones of free hydrocarbon activity.
Topics
Soil Science, Technologies, Characterization
Additional Topics/Tags/Keywords
Sensor, Conductivity, Soil


Organization:
Geoprobe Systems
Address:
601 N. Broadway
Phone:
DescriptionNumber
City:
Salina
1.
Primary (913) 825-1842
State/Province/Territory:
KS
2.
Zip/Postal Code:
67401
3.
Country:
United States
4.
Fax:(913) 825-2097
Branch Locations: