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Characterization of Miller‐Similar Silica Sands for Laboratory Hydrologic Studies
The use of well-characterized porous media can simplify and improve the efficiency of laboratory subsurface flow and transport experiments. The objective of this study was to present a comprehensiveExpand
Change in Bacterial Community Structure during In Situ Biostimulation of Subsurface Sediment Cocontaminated with Uranium and Nitrate
Evidence from the quantitative PCR analysis corroborated information obtained from 16S rRNA gene clone libraries, indicating that members of the δ-Proteobacteria subdivision, including Anaeromyxobacter dehalogenans-related and Geobacter-related sequences, are important metal-reducing organisms in acidic subsurface sediments. Expand
In situ bioreduction of technetium and uranium in a nitrate-contaminated aquifer.
The results suggest that NO3(-)-dependent microbial U(IV) oxidation may inhibit or reverse U(VI) reduction and decrease the stability of U( IV) in this environment. Expand
Simplified Method of “Push‐Pull” Test Data Analysis for Determining In Situ Reaction Rate Coefficients
The single-well, ``push-pull`` test method is useful for obtaining information on a wide variety of aquifer physical, chemical, and microbiological characteristics. A push-pull test consists of theExpand
Precipitation Estimation in Mountainous Terrain Using Multivariate Geostatistics. Part I: Structural Analysis
Abstract Values of average annual precipitation (AAP) are desired for hydrologic studies within a watershed containing Yucca Mountain, Nevada, a potential site for a high-level nuclear-wasteExpand
In-situ evidence for uranium immobilization and remobilization.
Findings indicate that in-situ subsurface U(VI) immobilization can be expected to take place under anaerobic conditions, but the permanence of the approach can be impaired by disimilatory nitrate reduction intermediates that can mobilize previously reduced uranium. Expand
Single‐Well, “Push‐Pull” Test for In Situ Determination of Microbial Activities
A single-well, “push-pull” test method is proposed for the in situ determination of microbial metabolic activities in ground-water aquifers. The method consists of the pulse-type injection (“push”)Expand
In situ evaluation of solute retardation using single-well push-pull tests
Abstract More efficient methods are needed for the in situ evaluation of solute sorption to aquifer sediments. The objective of this study was to develop a simplified method for estimatingExpand
Retardation of Dissolved Oxygen Due to a Trapped Gas Phase in Porous Media
Information on the transport of dissolved gases in ground water is needed to design ways to increase dissolved gas concentrations in ground water for use in in situ bioremediation (e.g., O{sub 2} andExpand