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FIELD AND LABORATORY EVALUATION OF DNAPL REMEDIAL PERFORMANCE
Citation:
ANNABLE, M. D., M. BROOKS, C. G. ENFIELD, R. G. FALTA, M. N. GOLTZ, J. W. JAWITZ, P. RAO, AND A. L. WOOD. FIELD AND LABORATORY EVALUATION OF DNAPL REMEDIAL PERFORMANCE. Presented at Partners in Environmental Technology Technical Symposium & Workshop, Washington, DC, November 28 - 30, 2006.
Impact/Purpose:
To inform the public.
Description:
The basic goal of DNAPL source treatment is to reduce health and environmental risks posed by the DNAPL contamination. Removing a sufficient mass of DNAPL to achieve concentration-based regulatory goals is difficult because of site hydrogeologic heterogeneity and uncertainties about DNAPL distribution. However, downgradient contaminant flux reduction resulting from partial DNAPL mass removal may be sufficient to stabilize or reduce the areal extent and total contaminant mass within the groundwater plume and may facilitate achievement of regulatory goals by means of natural attenuation processes or the deployment of complementary technologies as part of a treatment train. Thus, assessment of the benefits of source treatment requires information on the relationships between mass removal and flux reduction and between flux reduction and plume properties. Objectives of this SERDP-funded project (ER-1295) are to evaluate the mass-removal-flux reduction relationship using laboratory 2-dimensional flow cells and to assess DNAPL remedial performance using field measurements of mass discharge before and after source treatment. Contaminant discharge is measured across control planes located down gradient from source areas by multiple methods including passive flux meters and integral pumping tests. The study focuses on four field sites: Hill Air Force Base, Operable Unit 2 (Layton, Utah); former Sages dry cleaners (Jacksonville, Florida); Canadian Forces Base (Borden, Ontario, Canada); and Fort Lewis, East Gate Disposal Yard (Tacoma, Washington). Different source remedial technologies have been implemented at each site. Results of laboratory and field tests will be discussed and evaluated with respect to potential impacts on site remediation.