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Report No.
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Improvement and development of geochemical monitoring system for groundwater installed in the 350 m gallery of the Horonobe Underground Research Laboratory

Mezawa, Tetsuya; Miyakawa, Kazuya   ; Sasamoto, Hiroshi   ; Soga, Koichi*

Development of the monitoring technique for hydro-geochemical conditions of groundwater in low permeable sedimentary rocks with high content of dissolved gases in the underground facility is one of key issues in the Underground Research Laboratory (URL) project in order to obtain the reliable geochemical data. Development of the monitoring system for the groundwater geochemistry was conducted previously at the 140m gallery in the Horonobe URL. Thereafter, improvement and development of the monitoring system have been performed at the 350m gallery as the course of development technology to monitor the hydro-geochemical conditions during the URL construction. In this report, the results including the improvement and development of the monitoring system for the groundwater geochemistry at the 350m gallery and the several examples of data acquisition are presented.

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