Context and Problem Origin:
• March 2022: detection of free-phase hydrocarbons at control points P1, P7, P8, and P10
• Probable origin: historical spills in the tank bund and leaks due to poor sealing
Actions Undertaken:
- DAO and Excavation
o Removal of old tanks and piping
o Excavation and soil management (550.08 t – LER 17 05 04)
o Installation of a new tank area
- Active Decontamination (since June 2024)
o Installation of Pump & Treat system
o Total water pumped until December 2024: 133.32 m³
o Targeted surfactant injections in the central zone
Monitoring and Follow-up
o VOC readings and piezometric level measurements
o Quarterly analyses required by ACA
o Monitoring and compliance with RQs issued by ACA and ARC
o Analytical campaigns: August and November 2024
▸ Exceedance of indicative levels (NI) for TPHs, benzene, and BTEX
o Millimetric concentrations detected at P1 and P8 (Nov. 2024 and Jan. 2025)
