Services:

• Soil gas survey and source characterization
• Soil and groundwater monitoring
• Remedial/planning and design
• Construction
• Post-remediation monitoring

Description:

Natural Resource Technology investigated, evaluated remedial alternatives, and implemented remedial actions related to a release of chlorinated volatile organic compounds at an industrial site in Wisconsin. A soil gas survey was conducted to identify the source areas which minimized soil borings and sampling as well as optimized the locations for the permanent well installations. During source characterization, Natural Resource Technology also identified free-phase chlorinated solvents in the form of dense non-aqueous phase liquid (DNAPL).

The remediation strategy included removal of a large bulk of the contaminant mass by excavation of the DNAPL-impacted soil “hot-spot.” Dual-phase (soil vapor and groundwater) extraction was selected as a cost-effective alternative to address non-DNAPL-impacted, fine-grained soils. The final system configuration consisted of 38 dual-phase extraction wells and one submersible pump. After the system was installed, the site was paved and is currently being used for employee parking, as the system continues to remediate the site.