GPRS Hired to Conduct Investigation to Verify Existing Underground Storm Water Detention System

Ground Penetrating Radar Systems, Inc. (GPRS) was recently called to a project in Ann Arbor, Michigan.  The purpose of the investigation was to verify an existing underground storm water detention system.  In order to obtain proper building permits to move forward on the construction project, the contractor had to prove that the system was installed per engineering specs.  Rather than dig up and potentially compromise the system, the contractor called GPRS for help.  For the GPR portion of the survey, a 400MHz antenna with the SIR-3000 processing unit manufactured by Geophysical Survey Systems, Inc, (GSSI) was used.  The average effective penetration depth encountered during the GPR survey was approximately 8.0 feet below ground surface (bgs).  The GPR survey area was conducted in an east/west and/or north/south direction using approximate 5.0 foot surface grid spacing.

Site Plan Depicting the Survey Area and Findings (Note: Measurements are Approximate)

GPR Data Screen Shots (Note due to screen limitations, two screen shots were required to display entire retention system)

View of survey area facing northwest.  Note laterals identified in the field with orange paint and white flags.

View of Brian Chmielewski conducting GPR survey and marking laterals with orange paint and white flags.

Additional view of Brian Chmielewski conducting GPR survey using the 400 MHz GPR antennae.

GPRS, Inc. also has the capabilities of locating conduits, rebar, and post tension cables in a concrete slab.  For more information, to request a quote or to schedule your next project, please contact Brian Chmielewski at 517.512.0018 or by email at  For a complete listing of our nationwide locations visit

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