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Using Geophysical Techniques To Control In Situ Thermal Remediation
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 7th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems, Mar 1994, cp-208-00013
Abstract
Monitoring the thermal and hydrologic processes that occur during<br>thermal environmental remediation programs in near real-time provides<br>essential information for controlling the process. Geophysical techniques<br>played a crucial role in process control as well as for characterization during<br>the recent Dynamic Underground Stripping Project demonstration in which<br>several thousand gallons of gasoline were removed from heterogeneous soils<br>both above and below the water table. Dynamic Underground Stripping<br>combines steam injection and electrical heating for thermal enhancement<br>with ground water pumping and vacuum extraction for contaminant<br>removal. These processes produce rapid changes in the subsurface properties,<br>including changes in temperature, fluid saturation, pressure and chemistry.<br>Subsurface imaging methods are used to map the heated zones and control<br>the thermal process.