Aestus personnel were retained to survey a former
gas station site and assess the level of success achieved by remediation
using surfactant flush. We employed our StarTrax SurveyTM
technology which uses a combination of downhole and surface electrodes to
generate images at various locations around a borehole.
The above image shows results of Aestus’ StarTrax SurveyTM
which
correlated extremely well with the superimposed downhole e-log results
and site geology (as defined by logging of borehole samples). Specifically,
the peat, clay, pebbly clay, and clayey gravel layers correlate very well
between the discrete core samples, e-log, and StarTrax SurveyTM
image at
the location of the borehole. The above image also shows that no LNAPLs
(gasoline) exist in the typical zone of interest (~10-15 feet below ground
surface at this site) near this borehole location.
Standard discrete sampling methods such as core samples and e-log
provide valuable subsurface data. However, these data are
representative only of subsurface zones immediately surrounding the
borehole. As shown in the above StarTrax SurveyTM
image, the gravelly clay
layer, for example, pinches out just left of the borehole location. Borehole
data does not provide this type of this incredibly valuable information.
Aestus’ StarTrax SurveyTM provides
a continuous image of the subsurface. |
