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Report No.
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An Overview of the MIU-4 Borehole Investigations during Phase III

Kumazaki, Naoki; not registered ; Nakano, Katsushi; Ikeda, Koki; Amano, Kenji  ; Takeuchi, Shinji; Hama, Katsuhiro 

Surface-based investigations are now being carried out at the MIU site. Drilling of the MIU-4 borehole, one of the planned surface-based investigations in the MIU project, was commenced in June 2000. The main aims of the MIU-4 borehole investigations are to address the key issues (eg hydrochemistry, 3-D rock mechanics, geometry of steeply dipping water-conducting fractures, etc) remaining after the previous borehole investigations and to continue the development of appropriate, comprehensive techniques for assessing the deep subsurface. The borehole was dfilled from the centre of the MIU site in a north-easterly direction; the inclination and planned drilling length is 30$$^{circ}$$ from the vertical and 790m respectively. During MIU-4 Phase III (from july to October 2000), the borehole was drilled through the entire weathered section of the basement granite (from 88.65 to 134.47m along the borehole) at the MIU site. Planned geological, hydrogeological, hydrochemical, and additional investigations were carried out. High-quality information on geology, hydrogeology and hydrochemistry of the weathered granite was acquired and consequently this advanced the understanding of the geological environment at the MIU site. The techniques and QA/QC procedures adopted to the MIU-4 Phase I/II investigations proved to be effective for the current borehole investigations. In addition, a couple of recommendations for the remaining MIU-4 Phases and future borehole investigation programmes were given.

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