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Hickory Log Creek Dam is a proposed 55 meter high roller compacted concrete dam located on a tributary of the Etowah River near Canton, Georgia. The site characterization involved several approaches that facilitated the rapid foundation investigation schedule. These included identification of critical data needs, design of the program to collect these data, and selection of preferred data acquisition and evaluation. The foundation area of the dam is composed of fresh relatively unfractured mica schist in the stream valley and a mantle of residual soil and partially weathered rock on the abutment hillslopes.

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Although standard procedures and methods are available for many aspects of geotechnical site characterization, the quality of the results of such activities can be highly variable because of a variety of factors, including limitations resulting from the test procedures. For initial projects, the nature of these limitations as well as their likely consequences can be reasonably accommodated; however, subsequent use of the same data in a later study may not have the benefit of this project-specific insight, particularly if the data have been archived in a digital database. Consequently, a technique for quantifying data quality is necessary. A geographical information system (GIS)-based methodology has been developed to allow for the evaluation of borehole log quality as a function of its intended use. The methodology uses a flexible hierarchical model to provide a quantitative measure of quality. The quality of the discrete boreholes distributed across a site can then be analyzed spatially within a GIS to provide a more complete assessment of quality for the entire project. This framework also allows for evaluation of the effect of additional borehole logs at a site and can be used to optimize such planning activities in a virtual environment.