USGS scientist performing a routine calibration of an instrument used to collect air samples at a gasoline spill site in Galloway Township, New Jersey. The air samples were analyzed for volatile organic compounds (VOCs). Photo credit: USGS.
Discharge point of an MTBE plume at Laurel Bay Site, South Carolina, where active biodegradation of MTBE was taking place.
A set of nested monitoring wells used to measure vertical groundwater flow at the Laurel Bay Site, South Carolina. Each of the wells are completed at different depths to give a vertical profile of the concentrations of contaminants in groundwater.
Closeup of a core from a tree sample to monitor volatile organic compounds in the subsurface at Laurel Bay Site, South Carolina.
USGS scientists collecting water samples for analysis of natural-attenuation parameters at the Galloway Site, New Jersey.
Vapor sampling using a peristaltic pump and gas-tight syringe at the Galloway Site, New Jersey.
Unsaturated-zone well showing 1/4 inch stainless steel vapor probes at the Galloway Site, New Jersey.
Excavated leaking underground storage tank (UST) from the Galloway Site, New Jersey.
Column experiments quantifying biodegradation of hydrocarbons in the unsaturated zone from the Galloway Site, New Jersey.