Methods: Excavation landfarmingon site soil, pumping and treatment off site water and reinfiltration.
Products: TPH, BTEX, organochlorines.
LNAPL
Background information
Subsoil affected by hydrocarbons, benzene, xylenes and vinyl chloride in industrial land formerly dedicated to the agri-food sector and textile processing.
Estimated volume affected 30,000 m 3 and 650 m3 supernatant free phase.
Objective and limitations
Elimination of free phase and compliance with remediation objectives according to quantitative risk analysis.
Methodology applied
Pumping and extraction of supernatant free phase and groundwater treatment.
Soil excavation and treatment by forced aeration and biostimulation ( landfarming).
Simultaneous techniques due to the need to depress the water table.
Due to its proximity to the sea and morphology, it requires parceling and filling.
Results
Earth excavation
9700 m3
Stockpiling in waterproofed area
Waterproofing of northeast and southeast walls to prevent mobilization to the excavated area.