Geochemical contribution to now know underground waters quality of former toxic waste zones

Around 540 m3 of toxic liquid waste from Probo Koala Boat, were dumped in 13 zones, of the Abidjan district during the night of 20th to 21st August 2006. The abrupt character of the situation and insufficient knowledge about the risks of this high magnitude pollution has made it difficult to solve quickly this environmental problem. Therefore this work aims to improve technical knowledge about the management of underground waters analysis results from contaminated toxic waste in the sustainable development context. To make this work, an environmental sampling program to determine the presence or absence of potential contaminants in groundwater cause by the dumping of waste from the Probo Koala has been recommended to state of Côte d’Ivoire since 2015 by the UN Environment Program after the depollution work on the zones. 17 piezometers have been built to manage underground waters in Abidjan at the 13 toxic waste dumping zones. The results permitted to identify the lithology of the crossed formations and the static level of each piezometer. The large crossed formations find are clay, sand and sandy clay. All these formations stay on the bed rock which was reached at Alépé, Anyama (reference zone) and Agboville. The decision matrices permitted to determine that the water of bad quality are the water from each piezometers of the zones: zone 1 Erymakouguié, zone 3 Dokui2, zone 4 Abobo Coco service, zone 5 AboboSagbé, zone 7 M’Badon, zone 9 Filtissac. There are 6 zones where the water are bad quality. Good quality water are the water from the piezometers of the zones: zone 6 Akouédo, zone 8 Koumassi, zone 10 Maca Cité ADO. The aim of the decision matrices is to permit to the decision-makers “the public authorities” to find the quintessence of this work, as quickly as possible without necessary having to read it in full. Two color symbols have been used to characterize the water quality of the piezometers the green color shows that the underground waters is good quality, but the red color alerts that there are measures to be taken for the protection of the underground waters of concerned zones.