Processes that Control the Natural Attenuation of
Chlorinated Solvents
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Diffusion
samplers were placed in the bed sediments of the Kenai River,
Alaska, to monitor the biogeochemistry of a chloroethene plume as
it discharges into the river
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USGS scientists studied the natural attenuation
of a chlorinated-solvents plume at an old dry-cleaning facility
near Soldonta, AK. Here ground water is being sampled to assess
redox conditions in the plume
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USGS scientists assisted the U.S. Navy with the
design and assessment of an innovative remediation system that involved
the injection of
an oxygen-release compound in the source area of a chlorobenzene
and benzene plume at the Naval Air Station, Pensacola, Florida.
The two transects are along ground-water flow paths
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USGS scientists installing diffusion samplers
and microcosms to study subsurface bacteria that degrade trichloroethylene
at the Naval Air Warfare Center
Research Site, West Trenton, NJ (circa 2005). The samplers will
help USGS and U.S. Navy scientists evaluate the performance of a
biostimulation and bioaugmentation experiment
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USGS scientists strapped syringes to the sides
of the packer pipe rod to monitor dissolved hydrogen gas concentrations,
which indicate predominant biodegradation processes. The packer
system isolates six separate zones immediately downgradient from
the trichloroethylene (TCE) plume area where bacteria will be injected
by the U.S. Navy's consultant in a biostimulation and bioaugmentation
program |
Drilling operations at the Naval
Air Warfare Center Research Site, West Trenton, NJ in the center
of a trichloroethylene (TCE) plume (circa 2005). A multi-level monitoring
system was installed to evaluate the impact of a biostimulation
and bioaugmentation remediation program on the quality of water
in the fractured bedrock |
Samples of fractured rock were collected with
a 4-inch coring bit and were analyzed for concentrations of volatile
organic compounds (VOC's),
providing a direct measure of the contaminant concentrations in
the rock matrix at the Naval Air
Warfare Center Research Site, West Trenton, NJ |
USGS drilling operations (2004) at the Naval
Air Warfare Center Research Site, West Trenton, NJ. The objective
of the drilling program was to collect geologic and hydrogeologic
information on a fault that controls the migration of a trichloroethylene
(TCE) plume at the site |
Trichloroethylene (TCE) pipes at the Naval
Air Warfare Center (NAWC) Research Site, West Trenton, NJ. Jet
engine testing equipment was cooled with trichloroethylene (TCE).
Leaking pipes created a plume of TCE in fractured sedimentary rock
at the site |
A technician is pumping water from
a multi-level well during an investigation of the natural attenuation
of a chlorinated solvent plume under a fire training pit at the former
Wurtsmith Air Force Base,
Oscoda, MI. Tubing from the well leads to an in-line multi-parameter
probe that records pH, dissolved oxygen, Eh, and temperature |
A technician is collecting water-quality
samples from a multi-level well at the former Wurtsmith
Air Force Base, Oscoda, MI. The samples were analyzed for chemical
constituents that are indicators of natural attenuation processes |
DNA was extracted from aquifer solids
from former Wurtsmith Air
Force Base, Oscoda, MI, and was analyzed for patterns of microbial
diversity in a plume of chlorinated solvents undergoing natural microbial
biodegradation |
U.S. Environmental Protection Agency
scientists collected aquifer-material samples using an anaerobic
chamber as part of a study of the natural attenuation of trichloroethylene
(TCE) at Picatinny Arsenal,
NJ |
USGS scientists conducted a column
study to determined desorption rates of trichloroethylene (TCE) from
contaminated sediments from the Picatinny
Arsenal, NJ, Site. Desorption was an important continuing source
of TCE to the plume
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USGS scientists are about to sample
a fresh sediment core for analysis of trichloroethylene (TCE) content
to help estimate the mass of TCE sorbed on sediment in a subsurface-contaminant
plume at the Picatinny Arsenal,
NJ, Site
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