| Project Background |
| A release of 2,900 gallons of gasoline
from an underground storage tank occurred at an active
gas station site. In order to maximize placement of
sampling and remediation wells, Geo-Graf was retained to
perform a nonintrusive geophysical investigion at this
active station in an attempt to delineate the
contamination plume and possible migration path of the
product. |
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| Geo-Graf Investigation |
| Geo-Graf performed the investigation utilizing 4
different nonintrusive geophysical delineation
techniques, including Ground Penetrating Radar (GPR).
Near-surface contamination was detected throughout the
majority of the accessible sections of the seach area.
GPR data indicated contamination plumes at various depths
below the surface. Most of the contamination was detected
east of the active UST farm and appeared to be migrating
along the trenches of buried utilities. A contour map was
generated from the GPR data, indicating the plume depth
ranges from 1' to 11' below grade. |
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| GPR Data Profile |
| Please Wait as
the image below loads. It is actual radar data from a
Plume Delineation Project collected by Geo-Graf engineers
utilizing a 120 MHz GPR antenna |
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| Above: A GPR data profile showing
the "plume effect" from hydrocarbon subsoil
contamination. Also shown are several utilities and a
UST. 120 MHz GPR antenna system. |
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