Search Results - "Gallegos, Tanya J."

Mapping Abandoned Uranium Mine Features Using Worldview-3 Imagery in Portions of Karnes, Atascosa and Live Oak Counties, Texas by Bernard E. Hubbard, Tanya J. Gallegos, Victoria Stengel

“…Worldview-3 (WV3) 16-band multispectral data were used to map exposed bedrock and mine waste piles associated with legacy open-pit mining of sandstone-hosted…”
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FeS-coated sand for removal of arsenic(III) under anaerobic conditions in permeable reactive barriers by Han, Young-Soo, Gallegos, Tanya J., Demond, Avery H., Hayes, Kim F.

“…Iron sulfide (as mackinawite, FeS) has shown considerable promise as a material for the removal of As(III) under anoxic conditions. However, as a…”
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Identification and Characterization of Reclaimed and Underclaimed Mine Features Using Lidar and Temporal Remote Sensing Methods within the Coastal Plain Uranium Mining Region of Texas by Stengel, Victoria G., Gallegos, Tanya J., Hubbard, Bernard E., Cahan, Steven M., Wallace, David S.

“…We developed a spatiotemporal mapping approach utilizing multiple techniques for distinguishing and mapping known reclaimed mine sites from “unreclaimed” mine…”
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A Methodology to Assess the Historical Environmental Footprint of In-Situ Recovery (ISR) of Uranium: A Demonstration in the Goliad Sand in the Texas Coastal Plain, USA by Tanya J. Gallegos, Anne M. Scott, Victoria G. Stengel, Andrew P. Teeple

“…In-situ recovery (ISR) has been the only technique used to extract uranium from sandstone-hosted uranium deposits in the Pliocene Goliad Sand in the Texas…”
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Geoenvironmental Model for Roll-Type Uranium Deposits in the Texas Gulf Coast by Katherine Walton-Day, Johanna Blake, Robert R. Seal, Tanya J. Gallegos, Jean Dupree, Kent D. Becher

“…Geoenvironmental models were formulated by the U.S. Geological Survey in the 1990s to describe potential environmental effects of extracting different types of…”
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A uranium miner's daughter by Gallegos, Tanya J

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Organic compounds in produced waters from the Bakken Formation and Three Forks Formation in the Williston Basin, North Dakota by Varonka, Matthew S., Gallegos, Tanya J., Bates, Anne L., Doolan, Colin, Orem, William H.

“…The organic composition of produced waters (flowback and formation waters) from the middle member of the Bakken Formation and the Three Forks Formation in the…”
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New Geochemical Framework and Geographic Information System Methodologies to Assess Element Occurrence, Persistence, and Mobility in Groundwater and Surface Water by Johanna M. Blake, Katherine Walton-Day, Tanya J. Gallegos, Douglas B. Yager, Andrew Teeple, Delbert Humberson, Victoria Stengel, Kent Becher

“…This study presents a geochemical framework and geographic information system (GIS) method for assessing the intrinsic potential of surface water and…”
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Development and Description of a Composite Hydrogeologic Framework for Inclusion in a Geoenvironmental Assessment of Undiscovered Uranium Resources in Pliocene- to Pleistocene-Age Geologic Units of the Texas Coastal Plain by Andrew P. Teeple, Kent D. Becher, Katherine Walton-Day, Delbert G. Humberson, Tanya J. Gallegos

“…A previously completed mineral resources assessment of the Texas Coastal Plain indicated the potential for the future discovery of uranium resources…”
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A Novel Method for Conducting a Geoenvironmental Assessment of Undiscovered ISR-Amenable Uranium Resources: Proof-of-Concept in the Texas Coastal Plain by Tanya J. Gallegos, Victoria G. Stengel, Katie Walton-Day, Johanna Blake, Andrew Teeple, Delbert Humberson, Steven Cahan, Douglas B. Yager, Kent D. Becher

“…A geoenvironmental assessment methodology was developed to estimate waste quantities and disturbances that could be associated with the extraction of…”
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Hydraulic fracturing water use variability in the United States and potential environmental implications by Gallegos, Tanya J., Varela, Brian A., Haines, Seth S., Engle, Mark A.

“…Until now, up‐to‐date, comprehensive, spatial, national‐scale data on hydraulic fracturing water volumes have been lacking. Water volumes used (injected) to…”
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Dissolved organic matter within oil and gas associated wastewaters from U.S. unconventional petroleum plays: Comparisons and consequences for disposal and reuse by McDevitt, Bonnie, Jubb, Aaron M., Varonka, Matthew S., Blondes, Madalyn S., Engle, Mark A., Gallegos, Tanya J., Shelton, Jenna L.

“…Wastewater generated during petroleum extraction (produced water) may contain high concentrations of dissolved organics due to their intimate association with…”
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Insights on Geochemical, Isotopic, and Volumetric Compositions of Produced Water from Hydraulically Fractured Williston Basin Oil Wells by Gallegos, Tanya J, Doolan, Colin, Caldwell, Rodney, Engle, Mark A, Varonka, Matthew, Birdwell, Justin, Jolly, Glenn, Coplen, Tyler B, Oliver, Thomas

“…Tracing produced water origins from wells hydraulically fractured with freshwater-based fluids is sometimes predicated on assumptions that (1) each geological…”
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Uranium(VI) Interactions with Mackinawite in the Presence and Absence of Bicarbonate and Oxygen by Gallegos, Tanya J, Fuller, Christopher C, Webb, Samuel M, Betterton, William

“…Mackinawite, Fe(II)S, samples loaded with uranium (10–5, 10–4, and 10–3 mol U/g FeS) at pH 5, 7, and 9, were characterized using X-ray absorption spectroscopy…”
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Dependence of particle concentration effect on pH and redox for arsenic removal by FeS-coated sand under anoxic conditions by Han, Young-Soo, Demond, Avery H., Gallegos, Tanya J., Hayes, Kim F.

“…•Solid-solution ratio (SSR) effect observed at pH 5, but not at pH 7 and 9.•At pH 5, Kd increased with SSR, inverse to typical trend.•SSR effect tied to change…”
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Model Predictions of Realgar Precipitation by Reaction of As(III) with Synthetic Mackinawite Under Anoxic Conditions by Gallegos, Tanya J, Han, Young-Soo, Hayes, Kim F

“…This study investigates the removal of As(III) from solution using mackinawite, a nanoparticulate reduced iron sulfide. Mackinawite suspensions (0.1−40 g/L)…”
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Spectroscopic Investigation of the Uptake of Arsenite from Solution by Synthetic Mackinawite by Gallegos, Tanya J, Hyun, Sung Pil, Hayes, Kim F

“…As(III) uptake from solution by synthetic mackinawite is examined as a function of pH and initial As(III) concentration using X-ray absorption spectroscopy…”
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Geochemistry and hydrology of perched groundwater springs: assessing elevated uranium concentrations at Pigeon Spring relative to nearby Pigeon Mine, Arizona (USA) by Beisner, Kimberly R., Paretti, Nicholas V., Tillman, Fred D., Naftz, David L., Bills, Donald J., Walton-Day, Katie, Gallegos, Tanya J.

“…The processes that affect water chemistry as the water flows from recharge areas through breccia-pipe uranium deposits in the Grand Canyon region of the…”
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Direct Trace Element Determination in Oil and Gas Produced Waters with Inductively Coupled Plasma‐Optical Emission Spectrometry: Advantages of High‐Salinity Tolerance by Jubb, Aaron M., Engle, Mark A., Chenault, Jessica M., Blondes, Madalyn S., Danforth, Cloelle G., Doolan, Colin, Gallegos, Tanya J., Mueller, Dan, Shelton, Jenna L.

“…Waters co‐produced during petroleum extraction are the largest waste streams from oil and gas development. Reuse or disposal of these waters is difficult due…”
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Assessment of surface water chloride and conductivity trends in areas of unconventional oil and gas development-Why existing national data sets cannot tell us what we would like to know by Bowen, Zachary H., Oelsner, Gretchen P., Cade, Brian S., Gallegos, Tanya J., Farag, Aida M., Mott, David N., Potter, Christopher J., Cinotto, Peter J., Clark, Melanie L., Kappel, William M., Kresse, Timothy M., Melcher, Cynthia P., Paschke, Suzanne S., Susong, David D., Varela, Brian A.

“…Heightened concern regarding the potential effects of unconventional oil and gas development on regional water quality has emerged, but the few studies on this…”
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