Because of health hazards and possible breach of contaminant caps, waste-site managers are<br>reluctant to grant permission to conduct geophysical surveys directly across repositories. Yet,<br>they need to know if the integrity of confined aquifers is being maintained beneath these sites<br>and if contaminant pathways may exist outward from these sites. One possible way to supply<br>these needed answers is the use of three-dimensional (3D) seismic reflection surveys. These<br>surveys can acquire data around the perimeter of a restricted-access area while lines that<br>traverse the area may be selected for processing and interpretation.<br>To evaluate the feasibility of this approach for an area where these problems exist, a threedimensional,<br>three-component (3D/3C) seismic survey was conducted at the U.S. Department<br>of Energy’s Savannah River Site (Figure 1) along the survey lines shown in Figure 2. Both<br>P- and S-wave seismic data were taken from a set of 13 source points along Line A at a<br>separation of 12 m into a spread of 24 three-component, 40-Hz geophones along Line C. The<br>geophones were set at a perpendicular offset of 36 to 105 m from the center of the source<br>point array (Figure 3). At each source point, a 9.1-kg hammer was repeatedly struck<br>vertically and then horizontally in four directions against a firmly embedded steel fixture.


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