EVS shows Excavating Area(Wall slope is 60deg. to holizontal ) of Benzene Plume (above 0.01mg/L). Green squares are soil removal area on remedy work by Tokyo metropolitan Agency. Contaminated area seem to be still existed. This is The reason why groundwater polution is reported . The model is produced using ‘C Tech; Earth Volumetric Studio; OVERBURDEN module’. The model Z scale is 5 times to XY scale.