Dual Vacuum Extraction

Definition

• Combines the vacuum extraction and groundwater extraction technologies to simultaneously remove both liquids and vapors from the same well.
• Creates "new" vadose zone within the extraction well's cone of depression that exposes previously saturated soil to the vacuum extraction process.
• Removes residual volatile and semi-volatile contaminants from below the static water table.

Application

• Typical vadose zone soil permeability range of 0.001 to >100 millidarcies (equivalent of 10E-8 to 10E-3 cm/s hydraulic conductivity).
• A condition of volatile or semi-volatile contaminants below the static water table: a smear zone.

Unique Characteristics

• Can eliminate the use of down hole pumps entirely in lower permeability acquifers.
• Treats residual product in the saturated (smear zone) and unsaturated zones.
• Can increase the water extraction rates in low permeability acquifers, thereby increasing the well capture zone.
• Can reduce costs and save time in groundwater restoration programs.

Case Studies

• Major Photographic Manufacturer, NY
• Major Car Rental Agency, Los Angeles, CA

Technical Papers

• Integrated Remediation Technology Provides Rapid Site Remediation
• Advances in the Vacuum Extraction Technology for Effective Subsurface Remediation
• Efficient And Cost-Effective Programs For Soils And Groundwater Restoration
• Full-Scale Remediation At A Superfund Site Using In Situ Vacuum Extraction And On-Site Regeneration Case Study-Phase I