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Abstract Submission Form

Desert Remedial Action Technologies

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**Title:** Field Scale Investigation of Mass Flux Reduction as a
Function of Source Zone Mass Removal for Immiscible Liquid Contaminated
Aquifers

**Name of First Author:** Erica L. DiFilippo

**Email of Author:** edifilip@hwr.arizona.edu **Author Phone Number:**
520-626-4191

**Organization to Which Author(s) belong** University of Arizona,
Department of Hydrology and Water Resources

**Conference Theme Considered Appropriate for Contents of
Presentation:** VOC remediation

**Other Authors (name and e-mail):**Mark L. Brusseau
(brusseau@ag.arizona.edu)

**Author Biography:** Erica L. DiFilippo received her Bachelor's degree
with Honors in Geology from Smith College in 2000. In 2001, she started
a graduate program in Earth Sciences at the University of Southern
California. She focused on constraining groundwater sources to a
landslide basin using geochemical tracers. She received her M.S. in
Earth Science in 2004 and immediately began a Ph.D. program in Hydrology
and Water Resources at the University of Arizona. While at the
University of Arizona, Erica has had the opportunity to work at the
Pacific Northwest National Laboratory in Richland, WA and the EPA's Kerr
Research Laboratory in Ada, OK. Under the direction of Mark L. Brusseau,
Erica's current research investigates the benefits of partial source
zone mass removal at chlorinated solvent contaminanted sites.

**Text of the Abstract:** The degree of mass flux reduction associated
with a given amount of contaminant mass removed is a key determinant for
evaluating the effectiveness of a source-zone remediation effort. Thus,
there is great interest in characterizing, estimating, and predicting
relationships between mass flux reduction and mass removal. There are
two general approaches to evaluating the mass flux reduction/mass
removal relationship, end-point analysis and time-continuous analysis.
End-point analysis, based on comparing mass and mass fluxes measured
before and after a source-zone remediation effort, was conducted for 21
remediation projects distrubuted throughout North America. Mass removals
were greater than 60% for all but three of the studies. For a majority
of these, the mass flux reduction/mass removal behavior was approximated
by a one-to-one relationship. Time-continuous analysis, based on
continuous monitoring of mass removal and mass flux under aqueous
flushing conditions, was performed for two sites: the Tucson
International Airport Area (TIAA) Superfund Site and the Canadian Forces
Base Borden Site. The reduction in mass flux was significantly different
for the two sites (90% vs. \~8%) for similar mass removals (\< 40%).
These results illustrate the dependence of the mass flux reduction/mass
removal relationship on source-zone architecture and mass-transfer
processes. The minimal mass flux reduction (or non-favorable) behavior
was observed for the Borden site with relatively ideal mass transfer
processes. Conversely, favorable mass flux reduction/mass removal
behavior was observed for the TIAA site with significantly non-ideal
mass removal. The mass flux reduction/mass removal relationship for the
TIAA site exhibited a multi-step behavior, which cannot be predicted
using some of the available simple estimation functions.