HR: 11:05h
AN: H42A-04    [Abstracts]
TI: Influence of NAPL-mixture dissolution dynamics on contaminant plume movement
AU: * McCray, J E
EM: jmccray@mines.edu
AF: Hydrology Program Environmental Sciences and Engineering Division Colorado School of Mines, 1500 Illinois Street, Golden, CO 80401 United States
AU: Poeter, E
EM: epoeter@mines.edu
AF: Hydrology Program Department of Geology and Geological Engineering Colorado School of Mines, 1500 Illinois Street, Golden, CO 80401 United States
AB: NAPL-mixture dissolution dynamics are not usually considered when assessing plume movement from NAPL source zones. However, quantifying mixture dissolution is critically important to consider for proper assessment of contaminant plume dynamics. Typically, the plume source is considered to not be a NAPL source when the center of mass of a plume is shown to be moving away from the proposed source zone. However, depending on the composition of the mixture, a NAPL source can produce a plume with a moving centroid because that would be expected as the NAPL mixture dissolves. To demonstrate this phenomenon, a model is used that combines an analytical 3-dimensional advection- dispersion equation with a numerical solution for NAP- mixture source zone dissolution. The model is used to simulate plume movement from a NAPL-mixture source at the Hanford Site in Washington state, USA. The NAPL source zone at the site is a complex NAPL mixture comprised of chlorinated solvents, lard oil, and butyl-phosphate compounds. At this site, a moving plume centroid has been used as evidence that no NAPL source exists even though other evidence suggests NAPL is present. The model demonstrates that a moving plume centroid can be consistent with a NAPL-mixture source zone.
UR: http://www.mines.edu/~jmccray/
DE: 1829 Groundwater hydrology
DE: 1831 Groundwater quality
DE: 1832 Groundwater transport
DE: 1055 Organic geochemistry
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting