Geoprobe Services

Geophysical Sensing

Electrical Conductivity
The electrical conductivity (EC) of soils is different for each type of media. Finer-grained sediments, such as silts or clays, will have higher EC readings. Coarser-grained sediments, sands, and gravels, will have lower EC readings. EC logs, when ocrrelated across a site, enable investigators to identify changes in thickness or elevation of sedimentary units of interest. For example, coarser-grained sediments will allow the migration of contaminants (hydrocarbons, chlorinated volatile compounds, or metals) and the finer-grained sediments will trap the contaminant. Thus, the EC system is a powerful to gain an understanding the location and movement of contaminants in the subsurface and assists in determining the proper placement of monitoring or extraction wells.

    Features and Benefits
  • Simultaneously measure soil conductivity and probing speed using the SC400 Wenner Probe
  • Greatly reduce the number of soil cores required to characterize sediments
  • View logging in real-time using Direct Image®FC5000 Field Instrument
  • Cost-effective alternative to borehole logging or cone penetrometer testing
  • Expendable dipole allows retraction grouting of logging holes
  • Spreadsheet compatible data storage

Soil Gas
Semi-quantitative screening of the location, depth, extent, and relative concentrations of chlorinated and non-chlorinated volatile organic compounds (VOCs) using the Membrane Interface Probe and FC4000 Field Instrument in conjunction with the appropriate trace gas detector.