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In relation with a study of arsenic pollution of groundwater in the Ogosta Valley, NW Bulgaria, a monitoring station was built in the floodplain in the upper reaches of the Ogosta River, not far from the town of Chiprovtsi. The observations took place at three adjacent sites including a hydrometric river gauge and two tube wells located closer and further from the river. River stages, groundwater level, water temperature and electrical conductivity were measured automatically at the three sites. Water pH, dissolve...