Avaliação preliminar no gerenciamento de áreas contaminadas: estudo de caso em uma área com potencial de contaminação

Abstract

Urban growth and the historical industrial occupation of several areas have contributed to the increasing occurrence of sites with contamination potential, making it necessary to develop studies that support their safe redevelopment. In this context, Preliminary Assessment represents the initial stage of Contaminated Site Management, allowing the identification of contamination indicators within the study area and supporting the planning of subsequent investigation stages. This study aimed to carry out the Preliminary Assessment of an area located in the municipality of Santo André, São Paulo State, Brazil, currently occupied by an educational institution and intended for future residential development. The methodology was developed according to the guidelines established by CETESB Directive Decision No. 038/2017/C. The results indicated that the site underwent different land uses over time, including activities with contamination potential, allowing the identification of potential contamination sources associated with past and current activities. Uncertainties related to the earliest periods of site occupation were also identified due to the lack of historical information. Based on these findings, the Conceptual Site Model was classified as MCA 1B, according to the classification system established by CETESB, due to uncertainties regarding the historical use of the site. Furthermore, the area was classified as a Suspected Contaminated Area, indicating the need for the continuation of the contaminated site management process through a Confirmatory Investigation. It is concluded that the Preliminary Assessment was essential for organizing the available information, identifying environmental uncertainties, and supporting decision-making regarding the management of the studied area.