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Ota, Kunio; Takeuchi, Shinji; Koki, Ikeda; Kenji, Amano; Matsuoka, Toshiyuki; Yabuuchi, Satoshi; Iwatsuki, Teruki
JNC TN7400 2004-001, 69 Pages, 2004/05
The MIZ-1 borehole investigation programme was launced in December 2002, as a step of the surface-based investigations at the MIU Site. In MIZ-1 Phase I/II (from March to May 2003), the borehole was drilled down to 123m in the uppermost part of the basement granite and geological, geophysical, hydrogeological and hydrochemical investigations were performed. Quality-controlled data on geology, hydrogeology and hydrochemistry of the sedimentary overburden and the basement granite were acquired, therby advancing the understanding of the shallow geological environment at the MIU Site. In addition, from technical and QC viewpoints, a range of successes and set-backs was produced and lessons and feedback from the achievements were obtained.
Kumazaki, Naoki; Koki, Ikeda; Goto, Junichi; Mukai, Kei; Iwatsuki, Teruki; Furue, Ryoji
JNC TN7400 2003-005, 112 Pages, 2003/08
The Shallow Borehole Investigations were one of the first programmes to be conducted at the MIU Construction Site, together with the reflection seismic survey and the re-investigation of borehole DH-2. The Shallow Borehole Investigation targeted the shallow part of the site, from the sedimentary cover rocks to the upper part of the granite. The main aims are understanding of initial groundwater flow and the groundwater chemistry, long term monitoring and to identify structural discontinuities in the sedimentary rocks and the weathered granite. From April to October 2002 four boreholes were drilled through the sedimentary sequence and the weathered granite section at the MIU Construction Site. Planned geological, hydrogeological and hydrochemical investigations were carried out. MP systems were installed in all boreholes by December 2002 and continuous monitoring of hydraulic head begun. Information on geology, hydrogeology and hydrochemistry of the sedimentary formation and the weathered granite was acquired. JNC's quality control procedures for borehole investigation programmes were employed. In addition, recommendations for future borehole investigation programmes, especially in sedimentary rocks, were given.