Fig.2-21 (a) Groundwater pumping system
After the packers were inflated, the drilling fluid was removed from the packed-off interval with a pump. During the pumping, the tracer concentration was measured at the site to estimate the contamination of the groundwater by the drilling bentonite fluid.
(b) Equipment of extracting porewater
The core is subjected to high pressure (ca.70～100MPa). 10～30cc of porewater was extracted from the 200cc core in two weeks.
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