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| Water Resources | New Jersey Water Science Center | Toxics Substances Hydrology Program |
GSA 2006 Post-Meeting Field Trip
USGS hosted a one-day field trip "Geologic, Hydrogeologic, and Biogeochemical Controls on Natural and Enhanced Degradation of Industrial Solvents in Fractured Rocks" on Thursday, 26 October 2006, as part of the 2006 Meeting of the Geological Society of America. The meeting was held 22-25 October in Philadelphia. A session at the meeting, Physical, Chemical, and Biological Controls on Remediation of Chlorinated Solvents in Fractured Rock, was convened by Allen Shapiro and Frank Chapelle.
Because of the extreme variability in permeability and geochemical conditions in fractured-rock aquifers, many of the methods and tools developed from investigations in porous media formations have limited applicability. USGS has designated the NAWC site as a field laboratory for multi-disciplinary research, in cooperation with U.S. Navy, NJDEP and other partners, including university and private sector researchers. Cooperative research with EPA and SERDP will begin in October 2006.
The field trip included visits to outcrop, examination of core, and several stations at the NAWC field site. Stations included presentations about recently developed field methods for investigating the fate and transport of VOC's in fractured-rock aquifers, and on natural and enhanced biodegradation in sedimentary rocks of the Newark Basin.
For more information, please contact:
Dan Goode, djgoode@usgs.gov
Claire Tiedeman, tiedeman@usgs.gov
Pierre Lacombe, placombe@usgs.gov
The NAWC project home page provides more information, including site descrition, bibliography, research team and headlines.
Frank Chapelle and Paul Bradley, USGS
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Geochemical conditions and microbial populations exhibit more variability in fractured-rock aquifers than in porous media systems. Field measurements include hydrogen and carbon monoxide gas, DNA from water and rock macrocosm samplers, and isotopes of carbon and hydrogen in VOCs.
Pierre Lacombe and Bill Burton, USGS
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The NAWC lies within the Newark Basin and is characterized by Triassic-age clastic sedimentary rocks, predominately mudstone in the Lockatong Formation, and sandstone in the Stockton Formation. In addition to outcrop, we will examine core from NAWC in the Lockatong and Stockton Formations, and at a fault zone. Correlation of Van Houten cycles in sedimentary deposition has been instrumental in understanding the framework for flow and transport in the dipping mudstones.
Carole Johnson, John Williams, and Karl Ellefsen, USGS
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Presentations of advanced borehole and surface geophysical methods will include heat pulse flowmeter, acoustic and optical televiewer, borehole television, seismic reflection and other tools. Recent applications have included cross-hole tomography for monitoring biodegradation.
Mary DeFlaun, GeoSyntec Inc.
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GeoSyntec, Inc. and ECOR Solutions Inc. recently conducted a bioaugmentation and biostimulation experiment at NAWC to enhance naturally-occurring biodegradation of TCE.
Dan Goode and Tom Imbrigiotta, USGS
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Field conditions downgradient of the biostimulation experiment are monitored in a multi-level well using packers and in situ sampling devices including diffusion bags, rock macrocosms, hydrogen-gas-permeable syringes, and tubes for collecting DNA.
Claire Tiedeman, Allen Shapiro, and Glen Carleton, USGS
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Water levels in different fractures of a multi-level well respond to pumping wells open to corresponding strata. Tracer tests using tracers with different diffusion coefficients will help distinguish between matrix diffusion and exchange with slowly-advecting zones.
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