The Lookout Release site in St. Helena Parish, Louisiana is the location of a gasoline pipeline leak, detected in 1997. A subsurface hydrocarbon plume containing gasoline-related constituents covering approximately 12.8 acres developed as a result of the pipeline leak. A geoelectrical resistivity survey was conducted over the site, with the goal of determining the extent and concentration of the subsurface plume. The pipeline actively transported gasoline related constituents from 1962 until the discovery of the leak in 1997, at which point the Louisiana Department of Environmental Quality (LDEQ) was informed of the leak. Elevated levels of separated phase hydrocarbons were found in the subsurface, and as a result the LDEQ immediately implemented remediation efforts at the site. These contaminants can be identified by anomalously high resistivity values.
Resistivity data were gathered over the site using the Geometrics Ohmmapper, which is a capacitively coupled resistivity tool that measures subsurface resistivity values at varying depths determined by transmitter-receiver spacing intervals. The raw resistivity data are inverted using Res2Dinv modeling software, producing 2D depth-corrected models of subsurface resistivity values. Comparison of the resistivity data with existing geochemical water chemistry data showed that zones of elevated resistivity were consistent with the location of known elevated contaminant concentrations. These results can aid the investigation and remediation of the Lookout Release site and other subsurface hydrocarbon plumes containing gasoline-related constituents.
|Commitee:||Duex, Timothy W., Schramm, William H., Schubert, Brian|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 52/06M(E), Masters Abstracts International|
|Subjects:||Geology, Environmental Geology, Environmental engineering|
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