Processes Affecting the Natural Attenuation of Fuels in Ground Water
(Laurel Bay, South Carolina and Galloway Township, New Jersey)

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USGS scientist performing a routine calibration of an instrument used to collect air samples to be analyzed for volatile organic compounds

Discharge point of an MTBE plume at Laurel Bay Site, SC, where active biodegradation of MTBE was taking place

Method monitoring wells used to measure vertical ground-water flow at the Laurel Bay Site, SC

Using tree cores to delineate the gasoline-contaminated ground-water plumes at the Laurel Bay Site, SC

Closeup of a core from a tree sample to monitor volatile organic compounds in the subsurface at Laurel Bay Site, SC

USGS scientists collecting water samples for analysis of natural-attenuation parameters at the Galloway Site, NJ

Vapor sampling using a peristaltic pump and gas-tight syringe at the Galloway Site, NJ

Unsaturated-zone well showing 1/4" stainless steel vapor probes at the Galloway Site, NJ

Excavated leaking underground storage tank (UST) from the Galloway Site, NJ

Column experiments quantifying biodegradation of hydrocarbons in the unsaturated zone from the Galloway Site, NJ