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• W2327679284 abstract "PreviousNext You have accessSymposium on the Application of Geophysics to Engineering and Environmental Problems 2011Augmenting Dense Geologic, Hydrologic, and Geotechnical Data with Late‐Stage Surface and Borehole Geophysics at a Low‐Level Radioactive Waste Repository in West TexasAuthors: Jeffrey PaineSojan MathewChangbing YangJeffrey PaineSearch for more papers by this author, Sojan MathewSearch for more papers by this author, and Changbing YangSearch for more papers by this authorhttps://doi.org/10.4133/1.3614219 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Geophysical studies ideally begin in the initial stages of many near‐surface investigations, but can also have a constructive role in mature scientific and engineering projects when significant subsurface issues are better defined. Integrating geophysics at any project stage can provide better lateral and vertical context for more complete characterization, prioritize additional investigations, and optimize hydrologic monitoring. For example, a recently licensed low‐level radioactive waste repository in west Texas has been extensively characterized geologically, hydrologically, and geotechnically through the drilling of more than 400 boreholes and monitoring wells and field and laboratory studies conducted over nearly two decades. Nevertheless, late‐stage surface and borehole geophysical studies contributed to a better understanding of some relevant hydrostratigraphic issues, including the near‐surface distribution of stratal units, stratal moisture content variations, and the occurrence of shallow ground water. At the repository, frequency‐domain EM surveys across key transects helped identify possible recharge areas, determine depth to conductive Triassic bedrock, and map the lateral extent of significant water saturation in the shallowest hydrostratigraphic unit. Time‐domain EM soundings, inversions of frequency domain EM data, and borehole conductivity and natural spectral gamma logs helped verify the thickness of the shallowest hydrostratigraphic unit, investigate the causes of apparent disagreement between borehole‐based lithologic interpretations and surface geophysical surveys, examine lithologic change within repository host strata, and determine optimal screen intervals for monitoring wells. Finally, comparisons of open‐ and cased‐hole geophysical logs helped quantify the effects of well construction on log response where obtaining an accurate representation of vertical lithologic and water‐saturation change is important. For example, zones completed with bentonite chips showed elevated gamma count rates, whereas screened intervals with sand pack showed reduced gamma rates. Recognizing these and other well‐construction effects helps avoid misinterpretation of key hydrostratigraphic properties.Permalink: https://doi.org/10.4133/1.3614219FiguresReferencesRelatedDetails Symposium on the Application of Geophysics to Engineering and Environmental Problems 2011ISSN (online):1554-8015Copyright: 2011 Pages: 642 publication data© 2011 Copyright © 2011 The Environmental and Engineering Geophysical SocietyPublisher:Environmental & Engineering Geophysical Society HistoryPublished: 06 Jul 2011 CITATION INFORMATION Jeffrey Paine, Sojan Mathew, and Changbing Yang, (2011), Augmenting Dense Geologic, Hydrologic, and Geotechnical Data with Late‐Stage Surface and Borehole Geophysics at a Low‐Level Radioactive Waste Repository in West Texas, Symposium on the Application of Geophysics to Engineering and Environmental Problems Proceedings : 65-65. https://doi.org/10.4133/1.3614219 Plain-Language Summary PDF DownloadLoading ..." @default.
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• W2327679284 title "Augmenting Dense Geologic, Hydrologic, and Geotechnical Data with Late‐Stage Surface and Borehole Geophysics at a Low‐Level Radioactive Waste Repository in West Texas" @default.
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