borehole Articles
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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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Inflatable Packers for the Water Well Developments and Maintenance
Replacement Inflatable Packers and Elements manufacture inflatable packers for the water well, borehole development and maintenance, including high pressure inflatable packers for hydro fracturing and block caving ...
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Inflatable Packers Meet or Exceed the Rigid Engineering Standards Demanded
Replacement Inflatable Packers and Elements Pty Ltd provide superior quality high pressure inflatable packers, essential for extreme pressure applications. They are broadly used in mining operations, oil and gas production and mineral water well and borehole ...
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Groundwater quality changes in a groundwater body in a poor chemical status
The chemical composition of groundwater in the Quaternary body SK1000600P in the Danube basin was analysed based on chemical analyses from 7 monitoring sites of the Slovak Hydrometeorological Institute network during 2002–2009 and 2010–2015 time periods. The current status was evaluated based on the Regulations of the Government of the Slovak Republic No 282/2010. The influence of the ...
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Measuring and interpreting gas flow from landfill boreholes case study
Current landfill gas measurement practice for measuring the gas composition is well understood, and there are standard procedures and instruments available to analyse the gas. It is also current recognised practice to measure the gas 'flow' from boreholes to monitor the production of gas in a landfill site. If care is taken to make the measurement in the same way each time, changes in the 'flow' ...
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Nitrate pollution in groundwater in two selected areas from Cameroon and Chad in the Lake Chad basin
The shallow aquifer in the Lake Chad basin is highly vulnerable to pollution. Analysis carried out on 316 wells and boreholes have showed a tendency towards an increase of nitrate values, exceeding 50 mg l−1. Nitrate concentrations ranged between about 1 and 300 mg l−1. Large variation in concentration was observed in wells and boreholes that are only short distances apart. High concentrations of ...
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Crosshole resistivity survey case study 1
Crosshole resistivity survey to find water Crosshole survey can be very effective in detecting groundwater and fracture zone. In some case, even with environmental limitation, where only a handful electrodes can be depolyed, crosshole resistiviy survey can still produce sound result. For example, in one of the survey we did, seven and fourteen electrodes were employed in the left and right ...
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A New Multilevel Ground Water Monitoring System Using Multichannel Tubing
A new multilevel ground water monitoring system has been developed that uses custom-extruded flexible 1.6-inch (4.1 cm) outside-diameter (O.D.) multichannel HDPE tubing (referred to as Continuous Multichannel Tubing™ or CMT) to monitor as many as seven discrete zones within a single borehole in either unconsolidated sediments or bedrock. Prior to inserting the tubing in the borehole, ports are ...
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Impact of intestinal microorganisms and protozoan parasites on drinking water quality in Harare, Zimbabwe
The presence of microorganisms and their potential impacts on drinking water from boreholes, bowsers, lakes, rivers, springs, taps and wells was investigated in peri-urban settlements around Harare. Escherichia coli, Salmonella sp., Vibrio cholerae and faecal streptococci were present in all water sources except for the boreholes and bowsers. Rivers, lake and wells showed the greatest diversity ...
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Norfolk County Council tackle groundwater contamination with low-flow - Case Study
Geotech low flow groundwater analysis equipment has enabled quick and easy access to samples at 2m intervals down a 28m screen in deep boreholes. Elizabeth Guilford of Norfolk County Council hired the low flow kit from Geotech and used it on a Norfolk CC landfill where leachate contamination of groundwater was suspected. Samples taken at 2m intervals close to elevation of the suspected ...
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H-ADCP Flow Gauge, Wessex Water case study
Wessex Water, Design, supply and installation of low-flow environmental impacts monitoring system on the River Yeo in Somerset, 2005-2008 Wessex Water contracted HL to install a new flow-gauge to provide flow data on the environmental impact of abstraction upstream and downstream of a riverside borehole for public-supply. Due to the channel and hydraulic conditions at the site on the River Yeo ...
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Norfolk CC tackle groundwater contamination with low-flow
Quick and easy access in deep wells Geotech low flow groundwater analysis equipment has enabled quick and easy access to samples at 2m intervals down a 28m screen in deep boreholes. Elizabeth Guilford of Norfolk County Council hired the low flow kit from Geotech and used it on a Norfolk CC landfill where leachate contamination of groundwater was suspected. Samples taken at 2m intervals close to ...
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Inspection Cameras for the Mining, Geological and Well Industry
When it comes to Borehole inspection requirements we can think of various industries and environments that these activities are engaged in. Underground deep drilling inspection camera for Geological Survey are becoming more frequent. Of course, when it comes to well inspections, we may immediately think of water well borehole inspections that are performed primarily in residential areas. The ...
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Flow measurement technology comparison: GA5000 Vs Hot Wire Anemometer
A typical landfill or contaminated land site under investigation will comprise of a suitable number of gas monitoring wells, with a planned series of monitoring visits. The monitoring will include gas flow measurements, which together with methane and carbon dioxide concentrations will be used to calculate gas screening values (GSV) and hence allow the determination of whether any gas protective ...
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Sustainable Groundwater Management in Indian Wells, CA - Case Study
Motivation The Indian Wells Valley in the Mojave Desert of California is home to the China Lake Naval Air Warfare Station, the city of Ridgecrest, and significant agricultural and mining interests. Residents and industries in the valley depend on groundwater, which has been depleted due to overuse since the 1960s. The Indian Wells Valley Groundwater Authority required accurate information on the ...
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Borehole logging case study
Corozal, Puerto Rico GeoView was tasked to conduct borehole geophysical logging of at a groundwater extraction well in the rural area of the Municipality of Corozal, Puerto Rico. Prior groundwater tests indicated possible contamination of the groundwater. The study area was primarily underlain by stratified, mostly dark gray basaltic tuff, andesite and basalt porphyry rocks assigned to the Los ...
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Advances in Multilevel Well Technology
Several detailed field studies performed at research sites in the 1980’s and 1990’s suggest that most contaminant plumes exhibit large variations in concentration over small vertical distances. These variations are caused by spatial variations in the contaminant source zones and heterogeneity of the geologic materials. Conventional monitoring wells have been shown to be ineffective for ...
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Vista Clara delivers slim-line Javelin Wireline to Leibniz Institute of Applied Geophysics in Hanover Germany
In January 2020, Vista Clara President, Dave Walsh, traveled to Hanover, Germany to provide on-site training and support for the Leibniz Institute of Applied Geophysics (LIAG), one of the first customers to deploy the new Javelin 238 Wireline system. LIAG purchased the state-of-the-art Javelin Wireline including both 2.38 (60 mm) inch and 3.5 inch (90 mm) NMR logging tools in order to ...
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Measuring Static Water Levels Made Easier with Eno Scientific
The Well Sounder 2010 PRO is a sonic water level meter, designed and manufactured by Eno Scientific, to measure static water level in wells, piezometers or boreholes. This portable handheld unit uses sound waves to measure the distance from the top of the well to the water level. This eliminates the need to lower anything into the well. Unlike standard water level tapes these acoustic meters are ...
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Extraction well design for DNAPL recovery.
The potential for downward migration of dense nonaqueous phase liquid (DNAPL) into deeper portions of a saturated hydrogeologic unit has important implications for successful groundwater remediation. Little information has been published regarding the design of extraction wells that allow DNAPL recovery without simultaneously creating a conduit for cross contamination by vertical migration ...
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