2004-07-10_GENERAL DOCUMENTS - M1999002

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results for all three sets and for both wave modes were normalized and merged together to produce the final image of the surveyed site. Section 4.0 Data Interpretation Figure A8 shows the tomographic slice through the merged image and the contour anomalies in the parallel projection. Figure A9 shows the contour images alone. The blue colors typically delineate weaker/fractured zones or open caverns.. The depths of blue anomalies in the two images appear to correspond well with the nahcolite deposits in the geological profile shown in figure A1. This correlation adds to the credibility of the imaged horizontal extent of possible solution caverns. In particular, a significantly larger extent of the lowest anomaly is in accord with the horizontal extent of extraction expected to be inversely proportional to the brine condensation that increases with the flow upward. The blue 'profile' marked with dashed line around the anomalies could be indicative of a possible shear failure above some of the caverns. Section 5.0 Conclusions 1. The TRT test survey provided images of the underground features within the solution mining zone that are in accord with geological data. 2. The configuration and horizontal dimensions of imaged reflective anomalies are in accord with the most likely development and horizontal extent of solution- mining-related caverns and structural changes. 3. The horizontal dimensions of imaged anomalies represent the average values as the array of sources and receivers placed in a single vertical well lacks the directional resolution in horizontal planes. 4. The survey results demonstrated the viability of the TRT application for imaging the effects and extent of solution mining, and provided the foundation for the development of a Full-Scale Monitoring System. The outline of such a system is described in Appendix E.