The Future tasks are as follows:
In order to improve the methodology of model construction, the uncertainty of data and models should be verified by comparing the models with newly obtained data in the Phase I-b or later.

For example, geology and geological structure around the MIU-4 are predicted (Figs.4.22, 4.23) prior to its excavation planned in the Phase I-b. These predictions of figs.4.22 and 4.23 are carried out based on the figs.4.24 and 4.21 for each. (See Chapter 4.1.4 2) for fig.4.21) Fig.4.24⁴³⁾ is a model constructed using all the available data prior to planning MIU-4 excavation. Data used for the construction of the geological models are shown in Tab.4.12.
This geological model is subject to evaluation by comparing these predictions with the newly obtained data during the MIU-4 borehole investigations.

Boundary	Data
	Data obtained by literature study / Geoscientific researches except for MIU Project	The result of the Phase I-a
Ground surface	Digital elevation data (20m mesh)*	-
Upper boundaryof weathered granite	140 boreholes for uranium exploration AN-1,AN-3,AN-6,AN-8,SN-14,SN-6, TH-15,TH-78,HN-1 Topographical map of basement rock 20),31) Seismic survey in the Shaft Excavation Effect Experiment	MIU-13
Upper boundary of "Moderately fracture zone" of Biotite granite	AN-1,3 34)	MIU-13
Upper boundary of "Moderately fracture zone" of Felsic granite	AN-1,3 34)	MIU-13
Tsukiyoshi Fault	12 boreholes for uranium exploration TH-13 Geologocal map13)	MIU-23

^* : 1/25,000 "Toki" and "Mizunami"published by Geophysical Survey Institute

Geological model is constructed in the Phase I-a on the assumption that the groundwater flow simulation adopts a continuum model. The groundwater flow simulation is planning to adopt several modeling methodologies in the future, therefore, it is required to provide these methodologies with respective geological models.

Regional geological history should be understood completely first. If the geological history contradicts geological model constructed in the Phase I-a, the model must be corrected to make it more reliable.