MAPEAMENTO DA CONTAMINAÇÃO POR POSTOS DE COMBUSTÍVEIS NA CIDADE DE LONDRINA-PR

Abstract

Gas stations are an essential activity for society, however, operational and equipment problems can lead to the unwanted release of toxic hydrocarbons into the environment. This work aimed to develop a georeferenced database on contamination by gas stations for the city of Londrina-PR. The data were collected from the environmental licensing procedures, with the Instituto Água e Terra, regional of Londrina. The Geographic Information System (GIS) was used for an integrated analysis of contaminated areas and water resources to be protected. Among the 115 gas stations in operation, 16 (13.9%) have contamination by hydrocarbon derivatives in their sites. Two contaminated areas are located in the River Jacutinga hydrographic basin, upstream from the water catchment point to supply the city of Ibiporã. High levels of TPH have been recorded, with the highest concentration of 17,600 mg/kg of soil. The chemical compounds benzene, toluene, ethylbenzene, xylenes and naphthalene were detected in different parts of the city, and benzene was identified in groundwater at the level of 1,774.2 µg/L. Four tubular wells in the city are located less than 100 meters from the points of contamination. The main source of these contaminations is the area of the underground tanks. The results presented, based on the elaboration of maps, represent a diagnosis of contamination in the city of Londrina, and the integrated analysis in a GIS environment is an important tool for the management of contaminated areas by the government.