HR: 0800h
AN: H31A-0362    [Abstracts]
TI: Analysis of Natural Attenuation at the Park-Euclid PCE Contaminated Site
AU: * Carreon, C
EM: ccarreon@arizona.email.edu
AF: Hydrology and Water Resources, University of Arizona 429 Shantz Bldg, Tucson, AZ 85721 United States
AU: * Carreon, C
EM: ccarreon@arizona.email.edu
AF: Instituto de Ingenieria, Universidad Autonoma de Baja California Blvd. Benito Juarez y calle de la Normal s/n. Ex ejido Coahuila, Mexicali, B.C 21280 Mexico
AU: Brusseau, M L
EM: brusseau@ag.arizona.edu
AF: Hydrology and Water Resources, University of Arizona 429 Shantz Bldg, Tucson, AZ 85721 United States
AU: Brusseau, M L
EM: brusseau@ag.arizona.edu
AF: Soil, Water and Environmental Science, University of Arizona 429 Shantz Bldg., Tucson, AZ 85721 United States
AU: Zhang, Z
EM: zhihui@ag.arizona.edu
AF: Soil, Water and Environmental Science, University of Arizona 429 Shantz Bldg., Tucson, AZ 85721 United States
AU: Field, J
EM: jimfield@email.arizona.edu
AF: Chemical and Environmental Engineering, University of Arizona Civil Engineering 306G, Tucson, AZ 85721 United States
AB: Tetrachloroethe (PCE) and diesel contamination has been documented in the local perched and regional aquifers at the Park-Euclid WQARF site in Tucson, AZ. Monitored natural attenuation (MNA) is currently been evaluated as a potential remediation technology for the PCE contamination at the site. Physicochemical characterization of the immiscible liquid contamination has been conducted in prior studies. The focus of this study is to evaluate the biochemical processes active at the site. Analysis of the Arizona Department of Environmental Quality (ADEQ) database shows that the original contamination in the perched aquifer, where PCE was the single chlorinated ethene involved, has evolved into a mixture containing PCE and several transformation compounds typically associated with PCE (Trichloroethene, TCE, Dichloroethene, DCE, and Vinylchloride, VC). In general terms, PCE concentrations have decreased while TCE concentrations have been constant in time. Accumulation of DCE isomers (mainly cis-1,2-DCE) is observed in most of the wells. Conversely, VC has been observed in only three wells and only since 2001. This suggests that PCE is undergoing transformation and that DCE transformation is the limiting step in the mineralization of PCE. The regional aquifer does not show evidence of active PCE transformation processes.
DE: 1831 Groundwater quality
DE: 1832 Groundwater transport
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting