Btex contaminated area diagnosis and mapping: case study

With the increase of the vehicle fleet in the country, the demand for fuel grows, thus increasing the number of gas stations in the national territory. However, from the unbridled growth, coupled with the lack of maintenance and wear and tear of the storage and pipelines of the stations can cause very serious problems for the environment and humans. This work aimed to determine and quantify BTEX compounds in soil and groundwater collected from a gas station area at various depths to map contamination surfaces. The primary environmental liability investigation had as its main function to evaluate the soil and groundwater quality. For this study, we found the presence of VOC in most points investigated at a depth of 0.5m. At most of these points, when reaching 1.0m of drilling, the measured concentrations were zero. Based on the environmental research study presented, it was possible to identify the contamination in the gas station area through the samples collected in the drilled wells, and found the presence of dissolved product in groundwater at values above the established by the Dutch List for the BTEX and PAH compounds.