ABSTRACTOne of the rehabilitation methods applied to wells incrusted with iron is acid treatment. In many cases, however, the owners of the wells and contractors are concerned about possible aquifer pollution. The aim of field experiments has been to find out how far hydrochloric acid can migrate within the unconsolidated aquifer during well treatment, and what changes it causes in the quality of ground water.Results indicate that the acid remains near the well where it reacts with clogging deposits. Twenty‐four hours after acidizing, no changes in ground‐water quality were observed in piezometers at greater distances than 5.0 m from the well. After flush pumping, the ground water reverted to its original qual
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