Showing results for: groundwater sampling Articles
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Plume distortion and apparent attenuation due to concentration averaging in monitoring wells
This paper, authored by University of Connecticut researchers who performed much of the early work on this topic, describe the various processes that bias groundwater samples collected from conventional monitoring wells. In particular, they discuss the dilution of contaminants that occurs when clean water is simultaneously drawn into monitoring wells pumped to produce groundwater ...
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Sampling trace-level organic solutes with polymeric tubing. Part 2. Dynamic studies
Parker and Ranney present the results of laboratory tests focused on investigation the potential positive or negative biases associated with using polymetric tubing to collect groundwater samples. This paper, the second in a series, focuses on the effects under dynamic (i.e., pumping) conditions. They show that negative biases are a function of the plymer material, the hydrophobicity of the ...
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Decontaminating Groundwater Sampling Devices
These studies are the second part of a two year project that examines decontaminating groundwater sampling devices. In the first year, the efficiency of various decontamination protocols was tested using small test pieces of materials that are commonly used in groundwater sampling devices. Those tests showed that a hot detergent wash and rinse followed by hot air drying (105°C) was the most ...
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Hydrochemical and multivariate analysis of groundwater quality in the northwest of Sinai, Egypt
The northwestern coast of Sinai is home to many economic activities and development programs, thus evaluation of the potentiality and vulnerability of water resources is important. The present work has been conducted on the groundwater resources of this area for describing the major features of groundwater quality and the principal factors that control salinity evolution. The major ionic ...
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Groundwater sampling methods and best practices
Determining the availability and quality of groundwater has become an issue for an increasing number of businesses and government agencies. Changes in legislation, pressure on aquifer supplies and a heightened awareness of the impact of industrial activity have made groundwater sampling a hot topic. However, collecting a sample from a monitoring borehole that is truly representative of the ...
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The naturally occurring carcinogen ptaquiloside (PTA) is present in groundwater below bracken vegetation
The present study demonstrates unequivocally the presence of the natural carcinogen ptaquiloside and its transformation product pterosin B in groundwater and surface water. Groundwater concentrations up to 0.23 nmol/L (92 ng/L) ptaquiloside and up to 2.2 nmol/L (0.47 µg/L) pterosin B were found. Five of 21 groundwater samples contained ptaquiloside exceeding the estimated threshold for ...
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Hitting the Bull`s-Eye in Groundwater Sampling
Many commonly used groundwater sampling techniques and procedures have resulted from methods developed for water supply investigations. These methods have persisted, even though the monitoring goals may have changed from water supply development to contaminant source and plume delineation. Unfortunately, the use of these methods can result in an incorrect understanding of the contaminant ...
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Soil Sampling under Buildings and Solving Vapor Intrusion using Horizontal Drilling
The Issue: The New Jersey Department of Environmental Protection (NJDEP) mandated soil and groundwater sampling under an active pharmaceutical company manufacturing building in order to address vapor intrusion inside the building. Installation of vertical borings and wells through the building slab was not practicable without profound disruption of manufacturing activities inside the building. ...
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Seepage-zone recognition of river water based on Cl− spatial difference
Based on Cl− monitoring data of river water and shallow groundwater samples on both sides of the Dashi River, we analyzed spatial distribution of Cl− content in surface water and groundwater, and evaluated the retardation strength, pCl−, the average retardation strength, pA, and the average residual retardation strength, pAR, of surface–groundwater Cl− content. We introduce the difference, Q, ...
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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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Chlorinated solvents
The initial PSG survey identified TCE source areas that did not agree with the GPR survey findings. Based on these results, a subsequent PSG survey was performed to further characterize the site and better define the source areas identified in the initial survey. Analytical results were provided to the client within four (4) days of receipt of samples at the laboratory for both surveys. The ...
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Stable lead isotopes reveal a natural source of high lead concentrations to gasoline-contaminated groundwater
Concentrations of total lead as high as 1,600 g/L were detected in gasoline-contaminated and uncontaminated groundwater at three gasoline-release sites in South Carolina. Total lead concentrations were highest in turbid groundwater samples from gasoline-contaminated and uncontaminated wells, whereas lower turbidity groundwater samples (collected using low-flow methods) had lower total lead ...
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Subsurface movement of zinc from contaminated dredge spoils at a periodically flooded site
In 1982, sediments contaminated with zinc, cadmium, and copper were dredged from Lake DePue in Illinois and deposited in a diked sediment disposal area (DSDA) that is flooded annually for at least three months. Data from soil and groundwater samples collected at multiple depths within and adjacent to the DSDA indicate vertical movement of the metals in the subsurface, although groundwater outside ...
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The chemical evolution of groundwater in the Kerman plain aquifer, Iran
A comprehensive hydrogeochemical study was carried out in the Kerman Plain Aquifer, Iran. Groundwater samples were collected from 58 sites. Groundwater was analysed for major constituents (Na+, K+, Ca2+, Mg2+, Cl−, SO42− HCO3−. Different methods including composite diagrams, saturation indices and multivariate statistical methods were employed in assessing groundwater quality. ...
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Using EQuIS and ArcGIS for Environmental Decision Support at a Large Oil Refinery
Untitled Document Abstract Environmental site characterization activities at a large industrial facility can be a complex and costly endeavor. The high volume of data generated from groundwater sampling, soil sampling and other field activities is often difficult to manage. As computer technologies have advanced, new data management and data visualization tools ...
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Arsenic in Bangladesh and Perth
This study details the the Arsenic problem in ground water from Bangladesh and how the PDV6000plus can be used to monitor the Arsenic levels in ground water wells. Contains comparison data with inductively coupled plasma mass spectrometer (ICPMS) for groundwater samples in Perth, Western ...
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Mather AFB demonstration of hydrasleeve no-purge samplers
MWHS Americas, Inc. (MWH) was contracted by Dolver Company, Inc. to perform a Point Source Bailer Demonstration at Mather Air Force Base (Mather). This demonstration was initiated to evaluate no-purge technology and indicate the feasibility of using the HydraSleeve no-purge samplers as an alternative groundwater sampling method. On June 18, 2002, eight HydraSleeve point source bailers were ...
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Chlorinated plume investigation
The initial survey of the AOC identified a source area of Trichloroethene (TCE) and the direction the plume was migrating in the groundwater. Three subsequent surveys were performed to identify additional source areas and to delineate the lateral extent of the plume, which was much greater than the client expected. The client's overall project costs were reduced significantly by effectively ...
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Vertical microbiological variation of a coastal aquifer in southern China
Microbial communities in a coastal aquifer in the Zhuhai region of southern China were investigated by culture-independent molecular approaches. Four 16S rRNA gene libraries of three groundwater samples from varied depths and one seawater sample were constructed and analysed by the amplified ribosomal DNA restriction analysis technique (ARDRA). The phylogenetic analysis indicated that the 16S ...
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A method for reducing purge volumes in deep monitoring wells: a purging experiment.
Regulatory agencies often require three well casing volumes or more be purged prior to collection of groundwater samples for chemical analysis. Costs are high for testing and disposing of potentially hazardous purge water; therefore, efforts must be made to minimize waste-water volume while obtaining representative groundwater samples. Lockheed sponsored a purge experiment on two deep monitor ...
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