scholarly journals Application of advanced geophysical logging methods in the characterization of a fractured-sedimentary bedrock aquifer, Ventura County, California

2002 ◽  
Keyword(s):  
Geophysical Logging ◽  
Ventura County ◽  
Bedrock Aquifer

Geophysical Characterization of a Fractured‐Bedrock Aquifer and Blast‐Fractured Contaminant‐Recovery Trench

1996 ◽  
Author(s):  
J. W. Lane ◽  
F. P. Haeni ◽  
Susan Soloyanis ◽  
Gary Placzek ◽  
J. H. Williams ◽  
...  
Keyword(s):  
Fractured Bedrock ◽  
Fractured Bedrock Aquifer ◽  
Bedrock Aquifer ◽  
Geophysical Characterization

4D CHARACTERIZATION OF A FRACTURED BEDROCK AQUIFER CONTAMINATED WITH PFOA: BENNINGTON, VERMONT

2018 ◽  
Author(s):  
Jonathan J. Kim ◽  
◽  
Peter Ryan ◽  
Edwin Romanowicz ◽  
Timothy Schroeder ◽  
...  
Keyword(s):  
Fractured Bedrock ◽  
Fractured Bedrock Aquifer ◽  
Bedrock Aquifer

Characterization of fracture connectivity in a siliciclastic bedrock aquifer near a public supply well (Wisconsin, USA)

2012 ◽  
Vol 21 (2) ◽  
pp. 383-399 ◽  
Author(s):  
Christopher A. Gellasch ◽  
Kenneth R. Bradbury ◽  
David J. Hart ◽  
Jean M. Bahr
Keyword(s):  
Public Supply ◽  
Bedrock Aquifer

scholarly journals Field, Laboratory and Modeling Evidence for Strong Attenuation of a Cr(VI) Plume in a Mudstone Aquifer Due to Matrix Diffusion and Reaction Processes

Soil Systems ◽  
2021 ◽  
Vol 5 (1) ◽  
pp. 18
Author(s):  
Steven Chapman ◽  
Beth Parker ◽  
Tom Al ◽  
Richard Wilkin ◽  
Diana Cutt ◽  
...  
Keyword(s):  
Reactive Transport ◽  
Fracture Network ◽  
Matrix Diffusion ◽  
Rock Matrix ◽  
Laboratory Methods ◽  
Field Laboratory ◽  
Bedrock Aquifer ◽  
Reaction Processes ◽  
Low Solubility

This study uses a combination of conventional and high resolution field and laboratory methods to investigate processes causing attenuation of a hexavalent chromium (Cr(VI)) plume in sedimentary bedrock at a former industrial facility. Groundwater plume Cr(VI) concentrations decline by more than three orders of magnitude over a 900 m distance down gradient from the site. Internal plume concentrations generally exhibit stable to declining trends due to diffusive and reactive transport in the low permeability matrix as fluxes from the contamination source dissipate due to natural depletion processes and active remediation efforts. The strong attenuation is attributed to diffusion from mobile groundwater in fractures to immobile porewater in the rock matrix, and reactions causing transformation of aqueous Cr(VI) to low-solubility Cr(III) precipitates, confirmed by high spatial resolution rock matrix contaminant concentrations and comparisons with groundwater concentrations from multi-level sampling within the plume. Field characterization data for the fracture network and matrix properties were used to inform 2-D discrete-fracture matrix (DFM) numerical model simulations that quantify attenuation due to diffusion and reaction processes, which show consistency with field datasets, and provide insights regarding future plume conditions. The combination of field, laboratory and modeling evidence demonstrates effects of matrix diffusion and reaction processes causing strong attenuation of a Cr(VI) plume in a sedimentary bedrock aquifer. This approach has important implications for characterization of sites with Cr(VI) contamination for improved site conceptual models and remediation decision-making.

Regional characterization of the Paskapoo bedrock aquifer system, southern AlbertaGeological Survey of Canada Contribution 2008-0479.

2008 ◽  
Vol 45 (12) ◽  
pp. 1501-1516 ◽  
Author(s):  
Stephen E. Grasby ◽  
Zhuoheng Chen ◽  
Anthony P. Hamblin ◽  
Paul R.J. Wozniak ◽  
Arthur R. Sweet
Keyword(s):  
Regional Scale ◽  
Coarse Grained ◽  
High Porosity ◽  
Fracture Density ◽  
Canadian Prairies ◽  
Aquifer System ◽  
Southern Alberta ◽  
Bedrock Aquifer ◽  
Western Portion

The Paskapoo Formation of southern Alberta supports more groundwater wells than any other aquifer system in the Canadian Prairies. Located in a region of rapid population growth and straddling watersheds where no new surface water licenses are available, this aquifer system is under increasing pressure to provide water supply. The Paskapoo Formation represents a foreland deposit of a siltstone- and mudstone-dominated fluvial system. The system is highly heterogeneous with broad ranges in physical properties that impact groundwater production. High-porosity coarse-grained channel sandstone can provide productive wells, whereas thin and fractured sands and siltstones are low producers. The basal Haynes Member and western portion of the Paskpaoo Formation have higher sandstone volumes than other portions of the system. Fracture density shows a strong inverse relationship to bed thickness, such that fracture flow becomes more important for thinner sandstone beds. There is no regional-scale flow system associated with the Paskapoo Formation; rather it is dominated by local-scale recharge processes. The geochemistry of Paskapoo Formation groundwater is largely controlled by the variable composition of immediately overlying glacial deposits.

Morphological Characterization of Mycobacteriophage R1

1974 ◽  
Vol 32 ◽  
pp. 254-255
Author(s):  
B. L. Soloff ◽  
T. A. Rado
Keyword(s):  
Carbon Source ◽  
Stationary Phase ◽  
Growth Phase ◽  
Minimal Medium ◽  
Morphological Characterization ◽  
Logarithmic Growth Phase ◽  
Complete Lysis ◽  
Lysogenic Culture ◽  
Logarithmic Growth

Mycobacteriophage R1 was originally isolated from a lysogenic culture of M. butyricum. The virus was propagated on a leucine-requiring derivative of M. smegmatis, 607 leu−, isolated by nitrosoguanidine mutagenesis of typestrain ATCC 607. Growth was accomplished in a minimal medium containing glycerol and glucose as carbon source and enriched by the addition of 80 μg/ ml L-leucine. Bacteria in early logarithmic growth phase were infected with virus at a multiplicity of 5, and incubated with aeration for 8 hours. The partially lysed suspension was diluted 1:10 in growth medium and incubated for a further 8 hours. This permitted stationary phase cells to re-enter logarithmic growth and resulted in complete lysis of the culture.

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