Dual-Phase Extraction (DPE) is an in-situ remediation technology designed to remediate soils and groundwater affected with volatile organic compounds (VOCs), including gasoline range organics and chloroethenes. This technology works by extracting soil vapor and groundwater from the subsurface using vertical wells at a high vacuum. The groundwater levels are lowered and soil/groundwater are remediated through the following mechanisms: (1) capture of soil gas in the vadose zone; (2) pneumatic control (and capture) of soil gas surrounding the wells; (3) capture of VOCs off-gassing from groundwater; (4) desorption of VOCs in soil; and (5) hydraulic control and capture of affected groundwater. After the dual-phase flow is extracted from the DPE wells, both phases are separated and treated to remove toxic compounds prior to discharge, in compliance with site-specific requirements.
The construction and operation of DPE systems requires permitting and operation in compliance with Federal, State, County, and City regulations.
DPE Engineering Services
DPE services include the following:
- Feasibility studies.
- Remedial action plans.
- Pilot testing.
- Regulatory support and permitting.
- Remediation system design.
- Construction.
- Operation and maintenance manuals.
- Training.
- Operation and maintenance.
- Remediation system optimization.
- Mass removal estimates.
- Reporting to regulatory agencies.
- Performance assessment reports