ECA Geophysics

Electromagnetic (EMI) surveys

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Courtesy of ECA Geophysics

EMI (EM-34) surveyDesigned and performed an EM-34 soil conductivity (soil mapping) survey of a 26-acre wood-waste landfill in Omak, Washington.  This soil mapping survey was designed to detect buried drums at a depth of 60 feet and was augmented by a total-field magnetometer survey.

While employed with the Arkansas Department of Environmental Quality (ADEQ), performed approximately 40 reconnaissance EM-31 soil conductivity surveys of proposed landfill sites throughout the State of Arkansas.

Performed an EM-31 soil conductivity survey of the U.S. Navy's Strategic Petroleum Reserve in Hackberry, Louisiana. Survey results enabled the prime contractor (Fluor Daniel) to design an effective perimeter warning system for the facility. Woodward-Clyde Consultants project.

Designed and performed an EM-61 metal detection survey of a 26-acre wood-waste landfill in Omak, Washington.  Survey was designed to detect buriedEMI (EM-61) survey metallic debris to a depth of 12 feet and was augmented by a total-field magnetometer survey.  Innovative in-field adjustments were made to address omnipresent data artifacts attributed to high brush, steep hummocks, and poor traction due to loose soil.

Performed an EM-34 soil conductivity (soil mapping) survey of a proposed 80-acre extension to an existing landfill in Little Rock, Arkansas. Results enabled prime contractor to locate ancient stream channels buried beneath the project area. Performed as a subcontractor to Browning Ferris Industries.

Designed and performed an EM-31 soil conductivity (soil mapping) survey at a convenience store (Little Rock, Arkansas) having significant hydrocarbon contamination of the near surface water table. Subsurface consisted of exposed vertical beds which disallowed otherwise predictable diffuse flow patterns. Survey results provided a plausible explanation for apparent conduit flow of contaminants; recommended recovery well locations were given to the client. Woodward-Clyde Consultants project.

Though informed that success of applied geophysics would be no greater than 50 percent, the construction client nonetheless requested that ECA Geophysics perform an EM-61 metal detection survey at the Denver Federal Center in Lakewood, Colorado to locate buried utilities. High complexity of buried utilities, coupled with poor soil conditions yielded indeterminate findings.

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