Remediation of an old environmental burden in Srní

Remediation of the area contaminated by the wood impregnation plant in Srní

Protection of a regionally important groundwater source Česká Lípa - jih






Remediation of an old environmental burden in an area contaminated by the historical wood impregnation operation in the water source area of Česká Lípa – South

Remediation of the water intake area of the water source Česká Lípa - south

Remediation of the water intake area of the water source Česká Lípa - south

MEGA, in cooperation with DEKONTA, carried out an extensive project to remediate an old environmental burden in the water source catchment area of Česká Lípa – South. The area was contaminated by the historical wood impregnation operation, posing a significant risk to a regionally important groundwater source.

Project objective

Project objective

The main goal was to reduce the potential risk of contamination of the groundwater source by polycyclic aromatic hydrocarbons (PAHs) and petroleum substances. The project focused on removing the source of contamination, the extremely polluted rock environment, in the contamination centre and the drip areas.
Implementation Period
The project took place from September 24, 2019, to August 31, 2023.
Funding
The project was co-financed by European Union funds through the Operational Programme Environment and additionally supported financially by the Liberec Region and the municipality of Provodín.

Remediation technologies applied

Remediation technologies applied

The following remediation technologies were used to achieve the project goals:

  1. Excavation of intensely contaminated sandstone eluvium and its treatment through on-site bioaugmentation.
  2. Treatment of contaminated sandstone bedrock using the in-situ chemical oxidation (ISCO) method with Fenton's reagent.
  3. Protective pumping followed by groundwater purification using the photooxidation method

Achieved results

Achieved results

  • Total remediated area: 8,617 m2.
  • Treatment of 12.943.80 m3 of contaminated soil through bioaugmentation.
  • Treatment of 13.729 m3 of groundwater at the remediation station.
  • Removal of 27.87 tons of PAHs and 13.3 tons of C10-C40 petroleum substances.
  • Removal of 812.33 tons of hazardous waste.
  • Application of 302 tons of Fenton's reagent into the bedrock.
After completing the remediation work, we reached the specified remediation limits with a safe margin. The potential risks from residual contamination are now at an acceptable level.

Environmental Benefit

Environmental benefit

The project significantly contributed to the protection of an important groundwater source in the region. By removing the main contamination hotspots, further increases in contaminant levels in groundwater were prevented, thus eliminating the threat to the catchment area and domestic wells in the village of Srní near Česká Lípa and other locations in the potential direction of groundwater flow.

Environmental Benefit

Follow-up measures

After the remediation, a two-year post-remediation monitoring plan was proposed, with semi-annual PAH analysis in groundwater from selected boreholes. This monitoring aims to evaluate the long-term effectiveness of the remediation measures.

Statement of the co-investor

Martin Puta

"I highly appreciate the successful implementation of the remediation of the old environmental burden in the area of the intake area of the Česká Lípa - South water source, which was jointly implemented by MEGA, a.s. and DEKONTA, a.s. The remediation in the Srní area is an excellent example of a responsible approach to the protection of our water resources and represents another important milestone in the protection of the environment of our region. MEGA is a reliable partner in the field of environmental care and is making a significant contribution to a more sustainable future for our region.”

Martin Půta
Governor of Liberec Region

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