Superfund Innovative Technology Evaluation (SITE)
Note: EPA no longer updates this information, but it may be useful as a reference or resource.
|Roy F. Weston, Inc. and IEG Technologies Corporation
This report summarizes the findings of an evaluation of the Unterdruck-Verdampfer-Brunnen (UVB) technology developed by IEG Technologies Corporation (IEG) and demonstrated in association with Roy F. Weston, Inc. This evaluation was conducted under the U.S. Environmental Protection Agency (EPA) Superfund Innovative Technology Evaluation (SITE) program. The UVB treatment technology was demonstrated over a period of 12 months from April 1993 to May 1994 at March Air Force Base (AFB) in Riverside, California. This Innovative Technology Evaluation Report provides information from the SITE demonstration of the UVB technology that is useful for remedial managers, environmental consultants, and other potential technology users in implementing the technology at Superfund and Resource Conservation and Recovery Act (RCRA) hazardous waste sites. The SITE demonstration for the UVB technology was designed with three primary and seven secondary objectives to provide potential users of the technology with the information necessary to assess the applicability of the UVB system at other contaminated sites. The demonstration program objectives were achieved through the collection of groundwater and soil gas samples, as well as UVB system process air stream samples over a 12-month period. To meet the objectives, data were collected in three phases: baseline sampling, long-term sampling, and dye trace sampling. Baseline and long-term sampling included the collection of groundwater samples from eight monitoring wells, a soil gas sample from the soil vapor monitoring well, and air samples from the three UVB process air streams both before UVB system startup and monthly thereafter. In addition, a dye trace study was implemented to evaluate the system's radius of circulation cell. This study included the introduction of fluorescent dye into the groundwater and the subsequent monitoring of 13 groundwater wells for the presence of dye three times a week over a 4-month period. The technology was analyzed to identify its advantages, disadvantages, and limitations. The UVB technology was evaluated based on the nine criteria used for decision making in the Superfund feasibility study process. The overall effectiveness of the system depends upon the time available for mass exchange between dissolved and vapor phase, the concentration gradient, the temperature of the operating system, the interface area of the bubble (bubble size), and the contaminant gas-liquid partitioning (mass transfer coefficient). The technology employs readily available equipment and materials. Material handling require-ments and site support requirements are minimal. The technology as presented at the SITE demonstration is limited to treatment of VOCs in the saturated zone and capillary fringe.