Site characterization for environmental cleanup provides the information needed to<br>determine the extent and scope of a specific problem and to adequately design remediation<br>strategies. Site characterization can be expensive when based primarily on in situ sampling by<br>invasive techniques to sufficiently describe the subsurface. Closely spaced probes are necessary to<br>insure that important features are not overlooked. Additionally, drill holes are conduits to the<br>aquifer that potentially may lead to further contamination. To reduce costs and to provide<br>characterization of a wider area, geophysical methods are often used to supplement drilling.<br>Unfortunately, the scarcity of subsurface samples can make it difficult to relate the images from<br>surface geophysical methods to relevant physical properties in the ground. The Groundwater<br>Remediation Field Laboratory in Dover, Delaware provides an opportunity to study the relationship<br>between in situ geotechnical measurements of physical properties with a variety of geophysical<br>data. We determine the ability of the geophysical techniques to image three targets beneath the<br>Groundwater Remediation Field Laboratory, and we compare the geophysical images with<br>subsurface properties inferred from extensive cone penetrometer data. Having in situ<br>measurements of the subsurface and a variety of geophysical data at one site enables us to correlate<br>geotechnical and geophysical methods to determine the subsurface character.


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