USGS Groundwater Information: Hydrogeophysics Branch
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![]() Photo of field site near the Naval Industrial Reserve Ordnance Plant, Fridley, Minnesota. Yellow objects are the boreholes used for study and concrete poles to protect the boreholes from vehicle damage. |
![]() Photo of field area where two-dimensional resistivity survey was conducted near the Naval Industrial Reserve Ordnance Plant, Fridley, Minnesota. White arrow indicates location of measuring tape along survey line. |
![]() Automated two-dimensional, direct-current electrical resistivity surveys were conducted using this computer console near the Naval Industrial Reserve Ordnance Plant, Fridley, Minnesota. |
![]() Electrodes such as the one shown here were used to either inject current into the ground or to measure the potential in the subsurface during the two-dimensional resistivity surveys conducted near the Naval Industrial Reserve Ordnance Plant, Fridley, Minnesota. |
![]() Stephanie Johnson (USGS, Minnesota) prepares to lower radar antenna into borehole near the Naval Industrial Reserve Ordnance Plant, Fridley, Minnesota. |
![]() Photo of well field area where two-dimensional resistivity surveys were conducted as part of a remediation monitoring study near the Naval Industrial Reserve Ordnance Plant, Fridley, Minnesota. |
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