Papers by Bruce Bjornstad
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Vadose Zone Journal, 2007
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Pleistocene cataclysmic flood deposits, informally referred to as the Hanford formation, blanket ... more Pleistocene cataclysmic flood deposits, informally referred to as the Hanford formation, blanket the Pasco Basin in south-central Washington. This area is a depositional sink for sediments generated by jokulhlaups scouring the channeled scablands during glacial periods. A thick sequence (up to 100 m) of such flood-deposited gravel, sand, and silt underlies much of the USDOE's Hanford Site, within the Pasco
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As a consequence of production and waste storage activities associated with Pu production, the Ha... more As a consequence of production and waste storage activities associated with Pu production, the Hanford Site (1,450 km 2 ) has radionuclide and chemical contamination in saturated and unsaturated sediments. The geology of the site strongly influences groundwater flow and ...
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Ground Water Monitoring and Remediation, 1994
Hydrogen gas was discovered within the steel casing above standing water in a percussion-drilled ... more Hydrogen gas was discovered within the steel casing above standing water in a percussion-drilled borehole on the Hanlord Site in south-central Washington state. In situ measurements of the borehole fluids indicated anoxic, low-Eh (<-400 mV) conditions. Ground water sampled from adjacent wells in the same formation indicated that the ground water was oxygenated. H2 was generated during percussion drilling, due to the decomposition of borehole waters as a result of aqueous reactions with drilled sediment and steel from the drilling tools or casing. The generation of H2 within percussion-drilled boreholes that extend below the water table may be more common than previously realized. The ambient concentration of H2 produced during drilling was limited by microbial activity within the casing-resident fluids. H2 was generated abiotically in the laboratory, whereby sterilized borehole slurry samples produced 100 times more H2 than unsterilizcd samples. It appears that H2 is metabolized by microorganisms and concentrations might be significantly greater if not for microbial metabolism.
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... RJ Serne RE Clayton CF Brown ... zone associated with the 299 E33-338 borehole involves five ... more ... RJ Serne RE Clayton CF Brown ... zone associated with the 299 E33-338 borehole involves five distinct stratigraphic units beginning with the Hanford formation H1 unit from the surface to a depth of approximately 15.7 m (approximately 51.5-ft) described as a sandy gravel to ...
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Vadose Zone Journal, 2003
... Biological reactivity is a possibility since certain bacteria have been isolated that can deg... more ... Biological reactivity is a possibility since certain bacteria have been isolated that can degrade 4-fluorobenzoate and use it as their sole C source (Oltmanns et al., 1989; Jaynes, 1994; Song et al., 2000; Carvalho et al., 2002). ...
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Abstract The Integrated Field-Scale Subsurface Research Challenge (IFC) at the Hanford Site 300 A... more Abstract The Integrated Field-Scale Subsurface Research Challenge (IFC) at the Hanford Site 300 Area uranium (U) plume addresses multi-scale mass transfer processes in a complex hydrogeologic setting. A series of forefront science questions on mass transfer ...
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Papers by Bruce Bjornstad