CLICK PHOTOS FOR AN ENLARGED VERSION
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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](photos/galloway/gassampling_sm.jpg)
USGS scientist performing a routine calibration of an instrument
used to collect air samples to be analyzed for volatile organic compounds
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![Discharge point of an MTBE plume at Laurel Bay, SC, where active biodegradation of MTBE was taking place](photos/laurelbay/laurelbay_sm.jpg)
Discharge point of an MTBE plume at Laurel Bay Site, SC, where active biodegradation of MTBE was taking place
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![Method monitoring wells used to measure vertical ground-water flow at the Laurel Bay Site, SC](photos/laurelbay/laurelbay2_sm.jpg)
Method monitoring wells used to measure vertical ground-water flow at the Laurel Bay Site, SC
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![Using tree cores to delineate the gasoline-contaminated ground-water plumes at the Laurel Bay Site, SC](photos/laurelbay/laurelbay3_sm.jpg)
Using tree cores to delineate the gasoline-contaminated ground-water plumes at the Laurel Bay Site, SC
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![Closeup of a core from a tree sample to monitor volatile organic compounds in the subsurface at Laurel Bay Site, SC](https://webarchive.library.unt.edu/eot2008/20080916122254im_/http://toxics.usgs.gov/sites/laurel_bay/images/MTBE_Image_7bsm.jpg)
Closeup of a core from a tree sample to monitor volatile organic compounds in the subsurface at Laurel Bay Site, SC
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![USGS scientists collecting water samples for analysis of natural-attenuation parameters at the Galloway Site, NJ](photos/galloway/galloway2_sm.jpg)
USGS scientists collecting water samples for analysis of natural-attenuation parameters at the Galloway Site, NJ
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![vapor sampling](photos/galloway/galloway3_sm.jpg)
Vapor sampling using a peristaltic pump and gas-tight syringe at the Galloway Site, NJ
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![Unsaturated-zone well showing 1/4 inch stainless steel vapor probes at the Galloway Site, NJ](photos/galloway/uz2_sm.jpg)
Unsaturated-zone well showing 1/4" stainless steel vapor probes at the Galloway Site, NJ
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![Excavated leaking underground storage tank (UST) from the Galloway Site, NJ](photos/galloway/galloway_sm.jpg)
Excavated leaking underground storage tank (UST) from the Galloway Site, NJ
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![Column experiments quantifying biodegradation of hydrocarbons in the unsaturated zone from the Galloway Site, NJ](photos/galloway/uz_sm.jpg)
Column experiments quantifying biodegradation of hydrocarbons in the unsaturated zone from the Galloway Site, NJ
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