4. Methodology
This study was conducted with Asia Arsenic Network (AAN) in Ukhia Upazila, Cox’s Bazar, Bangladesh. This work was run under the technical support of DPHE, Bangladesh. AAN was installed two pumping well in the study area. The field survey was provided water static table and higher depths of water level, elevations of ground, lithological and hydro chemical data of step-drawdown well tests the well No 2 and 4. These two wells was installed for the improvement of existing safe water supply systems. Identification of safe water, actual well construction, regulation of pumping rate, step drawdown, static water table, lithologic and geophysical setting were monitored during and before the drilling activities.