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CLICK PHOTOS FOR AN ENLARGED VERSION
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Aerial view of surface oil contamination from the pipeline rupture (circa 1979)
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Map of surface oil areas resulting from the pipeline rupture
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Crude oil spray area at the pipeline rupture site
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Conceptual model of the subsurface contaminant plume's microbial geochemistry
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Collecting vapor samples from contaminated areas in the unsaturated zone
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Cutting a frozen core for biogeochemical analysis
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Dr. Phil Bennett, University of Texas, Austin, with gas chromatograph equipment in an on site laboratory
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Installing a tensiometer in the unsaturated zone prior to a tracer test
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Making hydrogen gas measurements in the on site laboratory
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Tracer test being conducted to study subsurface contaminant transport
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Dr. Mary Jo Baedecker, USGS, working on geochemical characterization of the contaminant plume at the site |
USGS scientist collecting an unsaturated-zone gas sample with a syringe from a vapor sampling well. The sample was used to study the natural attenuation of hydrocarbon vapors in the unsaturated zone.
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USGS scientists conducting a ground penetrating radar (GPR) survey at the south subsurface oil pool
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USGS scientist lowers borehole radar into a borehole near the Naval Industrial Reserve Ordnance Plant, Fridley, Minnesota |
Soil moisture probes and tensiometers installed in the side of a pit for monitoring a tracer test in the unsaturated zone. Note black oil-contaminated sand on pit walls.
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Geochemical zones in the plume of dissolved constituents
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USGS scientists inoculating microbial growth media to determine the number and type of microorganisms carrying out biodegradation in the contaminated aquifer
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U.S. Department of the Interior |
U.S. Geological Survey
