Greensoil launches new remediation project in Sweden

Greensoil launches a new major remediation project in Sweden

We are proud to announce the start of a new in-situ remediation project addressing a complex chlorinated solvent contamination in Sweden. Historical releases of trichloroethylene (TCE) have resulted in a well-defined source zone and a down-gradient plume, predominantly concentrated within a silty smearing zone between 2–3 meters below ground level.

🔎 Subsurface Conditions
Investigations revealed:

• Fill material overlying a silty layer and deeper sand/silty moraine.
• Groundwater at approx. 2–2.5 m below ground level.
• Contaminant mass concentrated mainly in the low-permeability silty horizon, with additional dissolved-phase impacts in deeper groundwater.

This geological layering and contaminant distribution require a multi-technique, adaptive remediation strategy.

🛠 Our Technical Approach

To address both the source area and the separate hotspot, Greensoil will deploy a phased, integrated in-situ remediation system:

Phase 1 – Multiphase Extraction (MPE)

A high-vacuum system will lower the groundwater table and treat the unsaturated and smearing zones simultaneously. This phase targets:

• Volatile contaminants in soil vapor
• Residual mass absorbed in the smearing zone
• Shallow dissolved contamination

Phase 2 – Enhanced Reductive Dechlorination (ERD)

Once Phase 1 reduces mass and improves subsurface conditions, ERD will stimulate anaerobic biological degradation in both the source area and the deeper plume.

• Injection of degradable substrates
• Promotion of complete reductive dechlorination

Hotspot Treatment – Soil Vapor Extraction + Pump & Treat

A separate localized plume will be addressed with a combination of:

• Low/medium-vacuum SVE for shallow soils
• Pump & Treat for shallow groundwater

🧱 Working Safely in tight, active industrial spaces

One of the defining challenges of this project is the need to install a complete in-situ remediation system beneath concrete floors and between existing structures—without disrupting ongoing industrial operations.

• Drilling and system installation must be performed in tight indoor environments.
• All activities take place around sensitive machinery and active production areas.
• Strict safety planning ensures that workers, infrastructure, and equipment remain protected at every step.

The project showcases Greensoil’s capability to design and construct complex subsurface systems in confined spaces while maintaining industrial uptime and operational safety.