Maceió, February 12, 2019 - The assembly of a probe starts this Tuesday (2/12) in well 28 in the district of Pinheiro, where a sonar study will be performed. The study is a requirement of the National Mining Agency (ANM) and the objective is to monitor the salt wells through the eco-acoustic method. Acoustic waves are emitted using a specific equipment. With this emission, it is possible to make a technical evaluation of the well.