groundwater conductivity Articles
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Methods for Removing Signal Noise from Helicopter Electromagnetic Survey Data
A geophysical analysis was conducted over the abandoned T&T subsurface mines and portions of the Muddy and Roaring Creek watersheds in northeastern Preston County, West Virginia. The data were collected using helicopter-borne measurements of frequency-domain electromagnetic (FDEM) conductivity (390, 1555, 6254, 25,800, and 102,680 Hz). Noise was a significant issue in the lowest frequency EM ...
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Time lapse resistivity/IP survey case study
Changes in underground electric resistivity is typically resulted by the variations in groundwater conduction and soil water content. Monitoring this variation will help operator gain a better understanding of the underground water distribution over time. This may facilitates operators monitor abnormal underground or structural behaviour. Time lapse resistivity survey is therefore very useful ...
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Coastal aquifer hydrodynamics and salinity in response to the tide: case study in Lisbon, Portugal
The variability in dynamics and salinity of the coastal alluvial aquifer on which the city of Lisbon is located was evaluated. The evaluation was based on the analysis of level and groundwater electrical conductivity fluctuations depending on the tide in the Tagus River. The results obtained made it possible to recognize three sectors. First, a littoral sector where the variations in level ...
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Springtown, Texas - excavation; open-hole chemical oxidation case study
When a tanker truck overturned on this road near Springtown, Texas, approximately 8,000 gallons of gasoline was spilled. Some of the fuel burned, discoloring the pavement, but a large portion of the fuel seeped into the sandy soils. Immediately after the accident, local responders excavated some of the most severely contaminated soil, but excavation was discontinued when groundwater was ...
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Isotopic analysis of water cycle elements in different land covers in a small headwater watershed
In this study, comparisons of isotopic variation of rainfall, throughfall, surface water, and groundwater were conducted in the Meilin watershed, which represents two different land uses, chestnut wood and bamboo. Also, isotopic differences between rainfall and throughfall were identified in these sub-watersheds. The results showed that the isotopic value of incremental rainfall, incremental ...
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Site: Residential neighborhoods, Phoenix AZ - Case study
Date Conducted: March 2012 to December 2013 (project in progress) Client: Arizona DEQ Oversite Agency: Arizona DEQ Project Description: Vapor intrusion assessment of over 100 residential units located over a PCE groundwater plume. Hartman providing work scope, overseeing soil gas sampling program to define groundwater contamination, conducting on-site indoor air analysis, overseeing indoor air ...
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Hydro-geochemical characteristics of groundwater of Sirhind Nala sub-basin (Ghaggar river basin, India) in relation to salinity hazard
Hydro-geochemical investigation of groundwater of Sirhind Nala sub-basin of the Ghaggar river basin (Southwest Punjab) has been carried out to study the distribution and sources of various dissolved ions. The levels of EC indicated that high salinity of groundwater was confined to small patches. The variations in EC levels seem to be related to non-flushing of water entrapped by clay beds, ...
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Investigating and mapping spatial patterns of arsenic contamination in groundwater using regression analysis and spline interpolation technique
The present study investigates the hypothesis that arsenic concentrations correlate with tubewell depth, and examines the effectiveness of spline interpolation, specifically completely regularized spline (CRS) and spline with tension (SWT) in estimating the magnitude of arsenic contamination in groundwater in Thanh Tri, a densely populated district located in the southern part of Hanoi City, ...
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The variation of stygofauna along a gradient of salinization in a coastal aquifer
We examined the variation of stygofauna composition collected in wells, along a gradient in groundwater salinity/conductivity in a coastal aquifer from southern Portugal. The studied coastal aquifer is considered vulnerable to salinization due to seawater intrusion, caused by overexploitation of the aquifer. Knowing the response of the stygofauna species to present levels of groundwater ...
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Vertical disparity in electrical conductivity of groundwater: inferring water-bearing fractures in granitic aquifer
A detailed study was conducted in hard rock terrain for delineating water-bearing fractures using electrical conductivity (EC) logs. The EC logs of groundwater were taken both in pre- and post-monsoon seasons of the year 2001; in 25 borewells in a small granitic watershed at an interval of 1 m right from the water table (though narrow spacing wherever required) till the depth to bottom of the ...
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Subsurface characterization using a D-optimality based pilot point method
Detailed hydraulic conductivity estimation is a difficult problem as the number of direct measurements available at a typical field site is relatively few and sparse. A common approach to estimate hydraulic conductivity is to combine direct hydraulic conductivity measurements with secondary measurements such as hydraulic head and tracer concentrations in an inverse modeling approach. Even with ...
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Trends and transformation of nutrients and pesticides in a coastal plain aquifer system, United States
Received for publication March 19, 2009. Four local-scale sites in areas with similar corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] agriculture were studied to determine the effects of different hydrogeologic settings of the Northern Atlantic Coastal Plain (NACP) on the transport of nutrients and pesticides in groundwater. Settings ranged from predominantly well-drained soils overlying ...
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ESdat Online and ESdat Lab Portal: Eurofins - Case Study
Eurofins has adopted ESdat Online and the ESdat Lab Portal to replace the historic spreadsheets in order to increase efficiency and accuracy, and provide the landfill operators with direct access to their consolidated historical results through a web interface. Streamlining Landfill Environmental Monitoring The Eurofins Field Services Groundwater team conducts compliance monitoring on behalf of ...
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In Situ Bioremediation of Chlorinated Solvents
ABSTRACT: In situ bioremediation is ongoing at a former manufacturing facility in Portland, Oregon. Shallow groundwater at the site was impacted by chlorinated solvents, primarily trichloroethene and degradation products cis-1,2-dichloroethene and vinyl chloride. In situ chemical oxidation treatment was completed in 2003 via the injection of sodium permanganate in source areas. Subsequent ...
By Redox Tech
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Pilot scale investigation of coagulation combined with ozonation and pH adjustment in treatment of NOM rich water
This paper presents the results of a pilot scale investigation of coagulation using aluminium based coagulants (polyaluminium chloride sulphate (PACL1) and polyaluminium chloride (PACL2)), combined with pre-ozonation and pH adjustment, on natural organic matter (NOM) removal from groundwater. Tests were conducted at a semi-industrial pilot plant, using groundwater with a high content of NOM ...
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In Situ Bioremediation of Chlorinated Solvents: A Case Study
In situ bioremediation is ongoing at a former manufacturing facility in Portland, Oregon. Shallow groundwater at the site was impacted by chlorinated solvents, primarily trichloroethene and degradation products cis-1,2-dichloroethene and vinyl chloride. In situ chemical oxidation treatment was completed in 2003 via the injection of sodium permanganate in source areas. Subsequent stimulation of in ...
By Redox Tech
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Unique applications of MMR to track preferential groundwater flow paths in dams, mines, environmental sites, and leach fields
Groundwater systems have been notoriously di!cult to map with high degrees of accuracy. As a result, not only have traditional geophysical methods proven inaccurate for groundwater characterization work, but they are often costly in terms of time, money, and environmental trauma. "is paper describes a unique application of magnetometric resistivity or MMR (Edwards and Nabighian, 1991) for ...
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Radon distribution in groundwater of Taiwan
Radon levels were surveyed in 517 monitoring wells constructed in five major groundwater areas of Taiwan. The radon concentration in groundwater samples varied in a wide range from below the detection limit of 18 pCi/L up to 1,100 pCi/L. A worldwide comparison of reported groundwater radon levels was conducted. Overall radon levels in Taiwan groundwater are relatively low compared to other ...
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Advancing Green Technology case study
Challenge: A subject of considerable research in recent years, sulfate reducing bacteria have been demonstrated to be a dominant factor in the natural anaerobic biodegradation of petroleum hydrocarbons dissolved in groundwater. Antea Group has conducted extensive pilot testing at hundreds of sites across the United States that demonstrate the benefits of enhancing sulfate concentrations in ...
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Aquifers and hyporheic zones: Towards an ecological understanding of groundwater
Ecological constraints in subsurface environments relate directly to groundwater flow, hydraulic conductivity, interstitial biogeochemistry, pore size, and hydrological linkages to adjacent aquifers and surface ecosystems. Groundwater ecology has evolved from a science describing the unique subterranean biota to its current form emphasising multidisciplinary studies that integrate hydrogeology ...
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