Kiso-jiban Consultants Co., Ltd.

Doryokuro Kakunenryo Kaihatsu Jigyodan

Yukio Sakai

Hiroshi Mori

Koichi Yanagisawa

Katsushi Nakano

Katsuo Sakai

Toshihiro Seo

Tadahiko Muromachi

Katsuhiro Hama

Yukifusa Nakashima

Kenji Teshima

The present invention provides a system and a method for sampling groundwater under in-situ condition state in reliable, efficient and economic manner without disturbing environment of formation water present in under-ground layer. There are provided a continuous water sampling process and a batch style water sampling process for sampling formation water by confirming the same environment as that of the groundwater in the under-ground layer. After drilling water has been removed by the continuous water sampling process, formation water is repeatedly sampled by the batch style water sampling process, and a downhole system equipped with the continuous water sampling process and the batch style water sampling process is designed in such structure that it is moved up and down in a casing pipe and inserted into or removed from a packer system in the hole.

Packer type groundwater sampling system and water sampling method

A method and apparatus for investigating subsurface ground of a site to obtain and store information about soil conditions by pushing into the ground a cableless unit that includes a memory storage device able to collect the information throughout the whole investigation process. After completion of the process, the memory storage device is lifted up to the surface of the ground and is connected to a data processing unit located on the ground to extract the collected information on soil conditions.

Method and apparatus for investigating subsurface conditions

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Tokyo, Japan

Yukio Sakai