Electromagnetic (EM) Surveys
OAKRIDGE’s staff has conducted over a hundred EM projects in a variety of settings, focused on oil and gas facilities (active or abandoned), accidental waste releases, and highway maintenance yards. Projects undertaken by OAKRIDGE have included delineation investigations, liability assessments, trend analyses for the effectiveness of remediation systems, and as part of confirmation of remediation programs of both small and very large scale projects providing professional EM services to both public agencies and private entities. As produced water contains sodium and chloride, two highly conductive salts, the EM survey is a very useful tool for spills of this nature.
OAKRIDGE uses a Geonics EM31 and EM38 to conduct EM surveys, which utilizes advanced geophysical instrumentation in order to measure soil conductivity by non-intrusive means to a maximum depth of approximately 6m. As produced water contains sodium and chloride, two highly conductive salts, the EM survey is a very useful tool for spills of this nature. The Geonics EM machines are digitally synchronized with a GPS unit to allow for positioning and conductivity data to be stored on a digital datalogger. The data stored on the datalogger is used to create a 2-dimensional graphic to display the interpreted results of the EM survey.