Procedimentos e diretrizes para obras geotécnicas executadas em solos contaminados

RESUMO: As causas mais comuns de contaminações nos grandes centros urbanos estão frequentemente atreladas aos tanques enterrados em postos de gasolina. Evitar a contaminação do solo envolve o descarte adequado de resíduos ou demais materiais que representam riscos, assim o escopo proposto pelo trabalho é demonstrar os processos adotados para detectar, analisar e descartar o solo contaminado por hidrocarbonetos após a realização de obras geotecnicas de um empreendimento localizado na zona Sul de São Paulo. A liberação do material contaminado para bota-fora foi realizada através de monitoramento por meio de medidores de gases indicando os aspectos qualitativos das amostras. Os medidores auxiliaram na seleção dos horizontes de solos mais contaminados para coletar as amostras, seguindo os procedimentos NBR 15492 (2007) para análises quantitativas laboratoriais dos compostos químicos, sendo que a determinação das amostragens, acondicionamento ABSTRACT: The most common causes of contamination in large urban centers are often linked to the buried tanks of gas stations. Avoiding soil contamination involves the proper disposal of residues or other materials that represent risks, so the scope proposed by the work is to demonstrate the processes adopted to detect, analyze and discard hydrocarbon-contaminated soil after carrying out geotechnical works in a localized enterprise in the south of São Paulo. The release of the contaminated material for disposal was carried out through monitoring by means of gas meters indicating the qualitative aspects of the samples. The meters assisted in the selection of the most contaminated soil horizons to collect the samples, following the procedures NBR 15492 (2007) for quantitative laboratory analysis of chemical compounds, and the determination of the samples, conditioning and preservation of the samples followed the guidelines described by CETESB . The sustainable proposal for the remediation of contaminated soil was through burning it as an energy fuel for the cement industry and the ashes generated during the process were incorporated into the cement manufacturing blend. With all the procedures carried out on the spot, it was possible to draw an economic and comparative analysis of the conducts and executions adopted with the norms in force in Brazil, promoting guidelines within the works located in urban centers.