A Field Study of Non-Reactive Transport Behavior in a Heterogeneous Aquifer Unit
AuthorRohrer, Jonathan William
AdvisorBrusseau, Mark L.
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
AbstractTwo dual-well, forced gradient, tracer experiments have been conducted at a Superfund site as part of an effort to better define the efficiency of ongoing "pump and treat" remediation. An injection/extraction well couplet, 24.5 ft. in length, was used to generate steady flow through a 20 ft. thick semi-confined aquifer unit beginning at 140 ft. BGS. The unit grades downward from a fine-medium sand to a clayey gravel with cobbles up to 4 inches in nominal diameter. Bromide breakthrough was monitored at the extraction well and at four vertically discrete zones in a centerline monitor well located 13.8 feet from the injection well using an innovative multilevel sampler. Calculated hydraulic conductivities based on the tracer data range from 1 to 43 ft./day, and compare well to an aquifer pump-test value of 30.1 ft./day. One-dimensional transport modeling was used to estimate values of dispersivity ranging from 1 to 2 ft. for the medium sand.
Degree ProgramGraduate College
Hydrology and Water Resources