Pilot Site Preparations - Česká Zbrojovka (Czech Republic)

Site background

The Česká Zbrojovka (Zbrojovka Brno) site is a former industrial area impacted by historical use of chlorinated hydrocarbons, particularly chlorinated ethenes (ClE). A detailed site investigation showed that contamination is mainly confined to the less permeable near-surface layers, while deeper clay horizons (approximately 6–7 m below ground level) remain largely unaffected.

Elevated concentrations of ClE were detected in both soil and groundwater, especially near borehole HV-6 and probe Z-19. The contamination source zone was clearly delineated, and selective excavation of polluted unsaturated soils was recommended, with the remaining contamination intended for in situ treatment.

Preparatory works

A high-resolution survey using the MIHPT system (Membrane Interface Probe combined with Hydraulic Profiling Tool) was performed at 24 locations to define the horizontal and vertical extent of volatile organic compounds and to evaluate subsurface permeability.

Additionally, 22 soil samples and 4 groundwater samples were collected for laboratory analysis, and monitoring wells were installed to support long-term groundwater observation and remediation design.

Based on the investigation results, the site owner decided to demolish the adjacent building and excavate contaminated soils. As a consequence, the planned pilot test could not be implemented in 2025 as originally scheduled.

Next steps

Following the updated site conditions and laboratory findings, the remediation strategy now focuses on targeted in situ treatment of the remaining contamination. In 2026, a new monitoring system was installed, and a remediation project was prepared and submitted to the relevant authorities for approval.