Savannah River Site DNAPL technical program plan

Jordan, J.E.; Looney, B.B.; Rossabi, J.; Bergren, C.L.

doi:10.2172/10123836

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“…To decrease the cost of removal, methods for characterizing the stratigraphy, which affects the migration of DNAPL, and for monitoring the remediation of DNAPL (Jordan et al, 1993) are needed. To this end, the Branch of Geophysics, U. S. Geological Survey, which is being sponsored by the Department of Energy, is testing different geophysical techniques.…”

Section: Introductionmentioning

confidence: 99%

High resolution mapping of stratigraphy using seismic tomography; a feasibility test at the M-area basin, Savannah River Site, South Carolina

Ellefsen¹

1995

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At the M-Area basin, Savannah River Site, the saturated and unsaturated zones have been contaminated with dense non-aqueous phase liquids (DNAPLs). The remediation will cost less and require less time if the stratigraphy is known in detail because it strongly affects the migration and emplacement of the contaminants. For this reason, seismic tomography was tested to determine if it could be used to map the stratigraphy near monitoring wells. The test involved three experiments. For the first, the unsaturated zone was probed using sources on the surface and receivers in a fluid-filled monitoring well. The size of the smallest heterogeneity that could be resolved was approximately 10 ft, which is much greater than the thickness of the major sedimentary layers, and hence seismic tomography with this configuration will not be a useful tool for mapping the sediments. For the second experiment, the unsaturated zone was again probed but using sources and receivers in two fluid-filled monitoring wells. The resolution was approximately 3 ft, and changes in the velocities were well correlated with the fine-scale stratigraphy. For this configuration, seismic tomography can be used for detailed mapping if the wells are close together (i.e., within approximately 20 ft). For the third experiment, the saturated zone was probed using sources and receivers in two fluid-filled monitoring wells. The resolution was about 3 ft, and velocities were also well correlated with the stratigraphy. In the saturated zone, seismic tomography can be a valuable tool for high resolution mapping of stratigraphy even between widely spaced wells (i.e., up to 50 ft apart).

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Section: Introductionmentioning

confidence: 99%

Savannah River Site DNAPL technical program plan

Cited by 1 publication

References 0 publications

High resolution mapping of stratigraphy using seismic tomography; a feasibility test at the M-area basin, Savannah River Site, South Carolina

High resolution mapping of stratigraphy using seismic tomography; a feasibility test at the M-area basin, Savannah River Site, South Carolina

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