This project encompassed a series of vapor intrusion services that enabled the continued use of several classrooms in a university campus in the city of São Paulo. The project started with a vapor intrusion investigation through the multiple lines of evidence approach followed by an assessment of mitigation alternatives, and the implementation and operation of a Sub-Slab Depressurization (SSD) system.
Environmental investigations conducted at a former industrial site in São Paulo detected the presence of a plume of chlorinated solvents. The area is currently occupied by a university. An investigation with multiple lines of evidence revealed the occurrence of vapor intrusion in several areas, mostly used as classrooms.
For safety reasons, the Health Surveillance Agency closed these areas to prevent access and use.
In order to solve the issue, EBP Brasil (formerly Geoklock) conducted an intrusive vapor mitigation alternatives study, which suggested that the best option for the area consisted of the application of the SSD technique.
The primary tasks developed as part of this project included:
Following system startup, Geoklock conducted several monitoring events to assess air quality. Vacuum in the sub-slab was gauged continuously. The readings corroborated the successful mitigation of vapor intrusion, and the Health Surveillance Agency and the environmental agency (CETESB) approved the use of the classrooms and other areas.