Monitoring report of groundwater quality in and around the former Yotsugi open-pit mining site, Ningyo-toge, Okayama, Japan

not registered; not registered; Sato, Kazuhiko ; not registered; Tokizawa, Takayuki

Monitoring of groundwater quality from boreholes around the former Yotsugi open-pit mining site in the Ningyo-toge Environmental Engineering Center, JNC, has been carried out to estimate the environmental safety around the site. On 2000 FY, the monitoring with depth profiling of a physical-chemical parameter for the purpose of improving sampling method and updating data sets for the analysis has been implemented. And it revealed that: (1)U in groundwater and Ra concentration do not have a big variation. (2)Redox potential from almost all the boreholes tends to decrease according to the depth. On the other hand, there are a few dependence tendencies of the water temperature of groundwater and depth of pH and DO.