The results of the 1^st analysis loop allow overall understanding of groundwater flow. However, their comparison with the measured values obtained through the subsequent borehole investigations indicate a large discrepancy in the head distribution in the granite. Furthermore, it is recognized as an important task to clarify the cause of the discrepancy and the priority of data acquisition in order to reduce the uncertainty of the simulated results.

The 2^nd analysis loop, including groundwater flow simulation supplemented with the data obtained by three borehole investigations, produced excellent results by application of "equivalent continuum model". It makes the prospects for more realistic hydrogeological model and groundwater flow simulation. It indicates that the study approach is well functioning toward the systematization of methodologies and techniques for investigation, analysis and assessment. Results of the past hydrogeological investigations indicate that sufficient data allowing a statistical processing is obtained to forward model construction and groundwater flow simulation more effectively in the future. However, the present state is far from satisfactory. Thus, planning the future investigations requires solving these situations.

Now the 3^rd analysis loop is about to begin. In this loop, construction of the hydrogeological model is in progress on the both continuum and discontinuum, using a methodology of comparative analysis. The results of these investigations are planned to be evaluated through comparison with results of long-term pumping tests scheduled in 2001 FY and the subsequent observation on effects of the shaft excavation.