Tomoyo Hiyama, Techno Earth Corporation (Japan)
Hidefumi Ikeda, Techno Earth Corporation (Japan)
Hideyo Takahata, Techno Earth Corporation (Japan)
Hisashi Nirei, The Geo-pollution Control Agency, Japan (Japan)
Ground water for drinking water of the apartment building contained diphenylarsinic acid (DPAA) in Kamisu city, Ibaraki prefecture, Japan. The characteristics of the acid poisoning include brainstem-cerebellar and cerebral symptoms(Ishii et al., 2004).
After that, phenylarsonic acid (PAA) which may be a degradation product of DPAA is detected in the ground water. Both organoarsenic compounds are detected in groundwater and soil in the paddy field. To have the sustainable pumping without the compounds, the pumping and observation well system is set as follows. In the area, three main aquifers are developed with the sub-aquifers intercalated among each aquifer. The groundwater in middle and upper aquifers is not contaminated by both organoarsenic compounds but polluted in lower aquifer. Each of well screens for pumping and observation is set relatively in upper aquifer, middle aquifer and sub-aquifer overlying the lower aquifer with polluted groundwater. As the result of monitoring the ground water level in relation to the concentration of the organoarsenic compounds such as DPAA, PAA, etc., we could succeed to get the sustainability on the pumping up of ground water without the pollution from the middle to the upper for paddy field.