Dealing with DNAPLs

by Carrie J. Carter, Proj. Engr.; Consoer Townsend Envirodyne Engineers, Chicago, IL,
William H. DiGuiseppi, P.E., Sr. Hydrogeologist; Earth Tech, Alexandria, VA,

Serial Information: Civil Engineering—ASCE, 1998, Vol. 68, Issue 11, Pg. 46-48

Document Type: Feature article


Trichloroethylene (TCE) in groundwater is one of the most prevalent contamination problems at hazardous waste sites; a problem that is substantially greater if the TCE is present as dense nonaqueous phase liquid (DNAPL). This article describes a remediation project that demonstrates the effectiveness of dual-phase extraction technology, pneumatic fracturing, and air injection for remediation of aqueous, sorbed, and free-phase TCE from a shallow, low-permeable aquifer. The clean up is being performed under the Illinois Environmental Protection Agency's voluntary remediation program, which allows flexibility within a less rigid regulatory framework than enforcement driven programs.

Subject Headings: TCE | Mitigation and remediation | Waste sites | Occupational safety | Groundwater pollution | Project management | Pneumatic systems

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