Showing results for: groundwater sampling Articles
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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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Low Flow Groundwater Sampling Using RotaPump Inertial Lift Pump
This article tells you how to perform low flow groundwater sampling using a portable, surface-mounted pump with no decontamination required before each use and no chance of cross contamination between wells. An inertial lift pump moves a dedicated (stored in the well) pumping tube rapidly up and down. A one-way valve on the bottom admits water on the down stroke and retains water on the ...
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Gasoline spill from underground storage tanks - Conoco, Inc.
LOCATION: Watsonville, CaliforniaPROJECT DATE: July, 1987 to July, 1988CLIENT: Conoco, Inc. BACKGROUND: A gasoline spill from underground storage tanks at a service station in Watsonville was discovered. Approximately 1,500 gallons were lost to the shallow aquifer of low permeability. Physical recovery operations were not possible. The California Regional Water Quality Control Board (Central ...
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Low-flow groundwater sampling on a nuclear site - Case Study
Nuclear licensed site use of low-flow groundwater sampling shows: Reduced time, reduced quantity of purge water – both thus reducing cost - and reduced risk of operator contact especially with potentially radioactive-contaminated purge water thanks to a self-contained enclosed system. One of the biggest headaches on site is the purge water and the expense of getting rid of it – after ...
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Hydrochemical characteristics and quality assessment of urban groundwater in Urmia City, NW Iran
The aim of this study was to evaluate the quality and hydrochemical characteristics of urban groundwater in Urmia City, northwest of Iran. In order, 59 groundwater samples were collected and analyzed for various anions and cations. Result shows that, mineral weathering, ion exchange and anthropogenic activity are the main hydrochemical processes controlling urban groundwater chemistry. The ...
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Low-Flow Groundwater Sampling- Techniques Improve Sample Quality and Reduce Monitoring Program Costs
Ground water is often sampled to determine its water chemistry, to see if the water is acceptable for human consumption, or to sec if industrial activity may have caused contamination. Sampling ground water from monitoring wells has traditionally involved "purging" the well to remove stagnant water that may not be representative of in situ ground water quality. Regulatory guidance often ...
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Sustainable and Cost-Effective Destruction of Chlorinated Alkane-Alkene Contaminants via Biostimulation and Enhanced Reductive Dechlorination
Site Burlington Ontario, Canada. Past use environmental services; abutting property use automobile parts/service. Saturated subslab soils impacted with Chlorinated Volatile Organic Compounds (cVOC) 1,1,1-Trichloroethane (TCA); Dichloroethylene (DCE); Dichloroethane (DCA). Groundwater plume extends downgradient off-site; [cVOCs] exceed Ontario Ministry of Environment (MOE) Table 2 criteria. ...
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Waterloo Emitters used for Bioremediation Study in High Temperature Saline Groundwater
A study was undertaken to determine the success for aerobic bioremediation of aromatic hydrocarbons (BTEX) and MTBE (methyl tert-butyl ether) in high temperature, saline groundwater conditions. The study included laboratory microcosm experiments, as well as a field trial in Saudi Arabia, in which Solinst Waterloo Emitters were used. To view the full paper published about this study, please visit ...
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A new no-purge, non-displacement groundwater sampler
What Is It? The HydraSleeve sampler is designed to collect representative water samples from monitoring wells without purging. The disposable sampler collects a discreet sample from only the 'fresh formation' water in the screened interval of the well. It is fast, inexpensive, simple to use, generates no purge water and collects a sample suitable for all analytical parameters. Why It Works The ...
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Groundwater: Low-flow Purging and Sampling
Significant timesavings, improved sample process integrity, quality assurance and minimal quantities of potentially contaminated purge water to manage - are attractive as the focus on groundwater quality sharpens and economics demand best cost-benefit based methods Water has become a vitally important resource. Maintaining its quality and quantity and avoiding pollution are set to be watched ...
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Effective Groundwater Monitoring Using Dedicated Pumping Tubes
This article describes a groundwater monitoring procedure that does not require decontamination of pumping equipment, eliminates the chance of cross contamination between wells, and uses a surface pump. Two surface pumps are described, one for water level depths less than 25 feet and one for water level depths greater than 25 feet. Install Dedicated Pumping Tubes A dedicated pumping tube ...
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Hydrogeologic Investigation of VOC Contamination in Bedrock Using Mass Flux Analysis – A Case History
Courtesy of US EPA and NGWA proceedings of the 2004 U.S. EPA/NGWA Fractured Rock Conference: State of the Science and Measuring Success in Remediation, September 13-15, 2004, Portland, Maine AbstractA fractured bedrock system was investigated using a combination of hydrogeologic methods to minimize the number and depth of bedrock wells installed during the investigation. These methods were used ...
By Arcadis
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Assessing the transport and fate of MTBE
Untitled Document Abstract The ether oxygenates MTBE and TAME have been used in petroleum fuel formulations in the UK since the mid-1980s and have led to contamination of major aquifers with these chemicals, including the Chalk aquifer of southern England. An assessment is made of the controls on the fate of MTBE and BTEX compounds at a contaminated site on the Chalk aquifer, ...
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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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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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ITRC technical regulatory guidelines for passive diffusion sampling, 2004
Polyethylene diffusion bag (PDB) samplers are low-density polyethylene bags containing deionized water, used to collect water samples in groundwater wells for laboratory analyses of volatile organic compounds (VOCs). PDB samplers are passive devices, relying on the movement of groundwater from the aquifer or water-bearing zone through the screen or open interval of a well. VOCs in groundwater ...
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Assessing selenium contamination in the irrigated stream–aquifer system of the Arkansas river, Colorado
Received for publication December 4, 2008. Prudent interventions for reducing selenium (Se) in groundwater and streams within an irrigated river valley must be guided by a sound understanding of current field conditions. An emerging picture of the nature of Se contamination within the Lower Arkansas River Valley in Colorado is provided by data from a large number of groundwater and surface water ...
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Pump/Recharge Rate Affects Saltwater Intrusion
Untitled Document Many areas of the world use groundwater as their main source of fresh water supply. With the worlds population increasing at alarming rates, the fresh water supply is being continually depleted, increasing the importance of groundwater monitoring. One of the major concerns most commonly found in coastal aquifers, is the induced flow of salt water into fresh ...
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How to Remediate under an Intersection with Horizontal Wells
Roadway intersections within urban settings are arguably some of the most challenging areas for subsurface remediation. Many consultants tasked with remediation of challenging sites such as these become frustrated by the inability of a vertical remediation system to influence the area of concern and/or they are anxious that they will not efficiently bring their clients’ sites to closure. ...
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Multilevel Systems
Untitled Document Introduction A multilevel system is a groundwater monitoring device which allows the monitoring of a number of discrete groundwater zones within the subsurface. The system consists of packers and ports which are placed at varying locations along a casing string, effectively isolating and providing access to, each monitoring interval, see Figure 1. Due to ...
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