This project involved addressing a historical soil contamination issue with mineral oil, BTEX, and volatile alkanes in both the unsaturated and saturated zones of the soil, as well as in the groundwater across the entire investigation site. The contamination was a result of benzene/naphtha storage on the property in the 1930s and had spread across various parcels of land.
The remediation process consisted of excavating all soils up to a maximum depth of 4 meters below ground level (approximately 1.5 meters below the groundwater level) and extracting groundwater with concentrations of BTEX and alkanes above the predetermined risk threshold values.
In order to work in dry conditions, dewatering measures were implemented. The extracted groundwater was treated in a water purification system designed for a flow rate of 10 m³/h, consisting of an oil-water separator, an iron removal unit, a multiple-plate aerator with two air-side activated carbon filters, and two water-side activated carbon filters.
The soils (approximately 23,500 m³) were selectively excavated with stability measures (sheet pile walls) and transported to AGRC – the soil treatment center of Aclagro – for processing. Liners were installed along the excavation edges to prevent residual contamination. Afterward, the excavation site was backfilled and leveled.
To minimize odor issues, mist cannons were deployed and misting lines were set up along the perimeter fencing of the site.
