Abstract
Abstract Remediation of water-bearing formations contaminated by organic liquids continues to be a challenge faced by both the public and private sectors.3 Chlorinated solvents such as trichloroethylene (TCE) are especially troublesome since they are denser than water and tend to migrate downward below the water table. Dense organic liquids such as this are commonly referred to as dense nonaqueous phase liquids (DNAPLs) and are particularly difficult to locate and remove from aquifers. 11 Surfactant Enhanced Aquifer Remediation (SEAR) has recently been shown to be an effective method for remediating chlorinated solvents from alluvial aquifers, but in aquifers without a proven aquiclude there are serious concerns about the risk of further downward migration of these solvents when the interfacial tension is reduced by the injected surfactant. To address this concern, we have developed a new version of SEAR called neutral buoyancy SEAR that minimizes this tendency and is especially targeted at those aquifers without a sufficient capillary barrier such as impermeable clay below the contaminated water-bearing formation.
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