The Equipment and Transport Administration of the Brussels Region, the project manager, was faced with TPH contamination at the DELTA site. This site comprises an underground station, an underground metro depot and a bus depot. Twelve single-wall metal tanks were buried on the site and showed signs of leakage.

Mourik, the main contractor, carried out 6 meter deep excavations and removed the tanks. Further excavations were prohibited because of questions of the stability of the building. Deep Green was then chosen to treat the contaminated soil in-situ.

The soil to be treated showed mineral oil concentrations of up to 37,000 mg/kg.

• The decontamination target of 800 mg/kg was achieved.
• The treatment was carried out in-situ.
• The objectives were reached.