DNAPL Site Evaluation
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Remediation of a Fractured Rock Aquifer Containing Trichloroethylene Dense Nonaqueous Phase Liquid
Extensive chlorinated solvent contamination, including trichloroethylene (TCE) dense nonaqueous phase liquid (DNAPL), was found in ground water at a Navy Installation Restoration Program site on a former Navy property in Pennsylvania. Ground water at the site is encountered in the Triassic age Stockton Formation, which consists of gently dipping, alternating sandstone and mudstone units. Ground...
متن کاملEfficient forward modeling for DNAPL site evaluation and remediation
Although the general characteristics of DNAPL flow and transport in the subsurface are reasonably well understood, it is often difficult and expensive to pinpoint sources of DNAPL contamination. Inversion techniques to improve site characterization rely on a forward model of multiphase flow. Ideally the forward model would be very fast, so that many realizations can be carried out in order to q...
متن کاملStochastic Analysis of Dense Nonaqueous Phase Liquid Dissolution in Naturally Heterogeneous Subsurface Systems
Field-scale Dense Nonaqueous Phase Liquid (DNAPL) dissolution in three-dimensional heterogeneous subsurface systems is investigated using a stochastic approach that treats the variability of flow properties as three-dimensional random fields. A steady-state, quasi-static DNAPL saturation distribution in a source zone is derived, based on the previous research to describe the field-scale nonunif...
متن کاملDnapl Source Zone Characteriza- Tion Using a Stochastic Aggregation Model
DNAPL source zone characterization is important for risk assessments, feasibility studies, and identification of appropriate remediation technologies. If sufficient DNAPL is released into the subsurface, it can penetrate the water table because of its relative density to water. When the DNAPL is also less viscous than water, an inherently unstable DNAPL-water displacement occurs. Descriptions o...
متن کاملUse of Fluorophore/dnapl Mixtures to Detect Dnapls In-situ
Fluorophores such as aromatic compounds (e.g. benzene, toluene, ethylbenzene and xylenes, as well as other constituents of petroleum fuels, oils, lubricants and greases) are present as co-contaminants in many Dense NonAqueous Phase Liquid (DNAPL) spills or may be extracted by the flowing organic phase from the soil organic matter. From 10 to 25% of the carbon present in humic and fulvic acids (...
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