Characterization and monitoring of the Oyster, VA bacterial transport site using geophysical data

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Authors:Hubbard, Susan S.; Williams, K. H.; Chen, J.; Rubin, Y.; Majer, E. L.
Author Affiliations:Primary:
Lawrence Berkeley National Laboratory, Berkeley, CA, United States
Other:
University of California at Berkeley, United States
Volume Title:Geological Society of America, 2001 annual meeting
Source:Abstracts with Programs - Geological Society of America, 33(6), p.45-46; Geological Society of America, 2001 annual meeting, Boston, MA, Nov. 1-10, 2001. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0016-7592
Publication Date:2001
Note:In English
Summary:To evaluate the importance of heterogeneities in controlling the field-scale transport and stimulation of bacteria used for bioremediation purposes, a multidisciplinary research team has conducted a field-scale study within an uncontaminated sandy Pleistocene aquifer near Oyster, Virginia. Geochemical, hydrological and geophysical data were collected to characterize the site prior to performing several bromide and bacterial tracer test experiments. The first part of the talk will focus on results of the characterization effort at the site performed using hydrological and geophysical data collected across a range of spatial scales, including surface ground penetrating radar (GPR), radar crosshole tomography, seismic crosshole tomography, cone penetrometer (CPT) and borehole electromagnetic flowmeter. These interpreted data were used to constrain the numerical flow and transport models, as well as to reduce the ambiguity often associated with interpretation of field-scale transport experiments due to uncertainties about subsurface physical heterogeneities. Another aspect that we are interested in is the spatio-temporal link between the microbial, hydrological, and physical parameters. Permeability reductions of up to three orders of magnitude have been noted by other researchers during bacterial growth as a result of the formation of a biofilm on the outer surfaces of porous grains, the formation of bacterial aggregates that accumulate and plug pore constrictions, and pore-clogging biogenic gas production. The second part of the talk will focus on efforts that are currently underway at the Oyster Site to investigate the utility of geophysical methods for monitoring physical property variations in porous media caused by bacterial-related phenomena during a biostimulation experiment.
Subjects:Aquifers; Biofilms; Bioremediation; Boreholes; Clastic sediments; Cone penetration tests; Crosshole methods; Electromagnetic logging; Field studies; Geophysical methods; Geophysical surveys; Ground water; Ground-penetrating radar; Monitoring; Penetration tests; Permeability; Porous materials; Radar methods; Remediation; Sand; Sediments; Seismic logging; Simulation; Surveys; Tracers; Well-logging; Atlantic Coastal Plain; Delmarva Peninsula; Northampton County Virginia; Oyster Virginia; United States; Virginia; Bacteria
Coordinates:N370700 N373400 W0754000 W0760200
Record ID:2002016513
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
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