Environmental Health - Toxic Substances Hydrology Program

Photo Galleries from Completed Investigations

USGS installing a tensiometer at the Bemidji Crude Oil Spill Research Site, Minnesota.
Installing a tensiometer in the unsaturated zone prior to a tracer test. Tensiometers are used to measure water pressure in the unsaturated zone -- from the Crude Oil Contamination in the Shallow Subsurface Investigation


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