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Executive Summary
Pages 1-5

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From page 1...
... often can be expensive, cause disruption to human activities, and in some cases, create unnecessary damage to the environment. Drilling provides, in essence, a one-dimensional sample; multiple drillholes allow interpolation between such points but significant uncertainties can remain.
From page 2...
... Basic research on physical, chemical, and biological properties is needed to establish fundamental relationships, including coupled relationships, that improve capabilities for rigorous interpretation. A significant effort should be directed to develop scientific visualization technology that is aimed at substan
From page 3...
... The spatial and temporal resolution demanded in a specific characterization study is a major factor in the choice of method, and resolution normally is a function of the scale of the survey. An understanding of resolution requirements and capabilities is essential to informed choice and application of specific techniques and will provide important guidance in establishing research priorities.
From page 4...
... Fundamental studies should be expanded and developed to establish theoretical and phenomenological relationships among the responses measured using noninvasive methods and the properties and processes of interest in environmental and engineering problems of the shallow subsurface. These studies could include controlled standard test sites and variable-scale testing that would involve both laboratory testing of cores and full-scale multitechnique examinations of relevant field sites.
From page 5...
... However, many potential clients today perceive characterization tools as increasing costs without providing a commensurate additional value. Their primary objective commonly is to satisfy externally imposed requirements (e.g., building codes, environmental regulations)


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