well sampling Articles
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Use of Eight Well Purging and Sampling Record
This article describes a groundwater well purging and sampling form that can be downloaded at our website. A click on the articles button will take you to a list of Monitoring Tips and Procedures articles, one of which is the sampling form. The form can be used to record indicator parameters pH, conductivity, temperature, etc., taken during purging of a groundwater monitoring well. The form is ...
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CL-Out Pilot Study Vandenberg AFB - successful aerobic cometabolism
A pilot study of the applicability of CL-Out aerobic cometabolism of PCE and other chlorinated solvents was completed at Vandenberg Air Force Base. The pilot study consisted of injection in a single well and groundwater sampling at four surrounding wells to monitor the progress of bioremediation. During the pilot study, samples were analyzed for the contaminants and breakdown products, ...
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Achieving exemplary compliance case study
Challenge: A major integrated oil company retained the services of Antea Group to manage environmental liability at a bulk storage and distribution facility that supplies gasoline, diesel fuel and other refined petroleum product to Minnesota, Iowa and Wisconsin. The property presented a series of unique challenges including multiple LNAPL plumes, LNAPL identified within karst bedrock, ...
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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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Implications of observed and simulated ambient flow in monitoring wells
The authors of this paper present compelling evidence that conventional monitoring wells act as vertical conduits whenever vertical hydraulic gradients are present (i.e., at most sites). Vertical flow within wells due to natural hydraulic gradients not only makes it impossible to accurately define the vertical distribution of dissolved contaminants within the aquifer, but it can transport ...
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Optimal groundwater contamination monitoring using pumping wells
This study presents a new method for selecting monitoring wells for optimal evaluation of groundwater quality. The basic approach of this work is motivated by difficulties in interpolating groundwater quality from information collected for only few sampled wells. The well selection relies on other existing data relevant to contaminant distribution in the sampling domain, e.g. predictions of ...
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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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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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IEG multi level sampling well (MLSW) case study - IEG Technologie GmbH
The MLSW-system is used for the recovery of multiple high-quality samples of soil-gas and groundwater from numerous isolated horizons in a single standard borehole. The system is also used to accurately delineate contamination profiles in three dimensions, which is vital or the design, installation and monitoring of remediation systems. MLSWs also can be used for activly dispersing ...
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Low-Flow Purging Reduces Management of Contaminated Groundwater
Purging a monitoring well prior to sampling removes stagnant water in the well casing and ensures collection of groundwater samples representative of formation water. Traditionally, a number of well casing volumes are removed (from three to five) and water stabilization parameters are monitored during removal of the casing volumes. Temperature, pH and specific conductance are routinely monitored ...
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Integrated Nutrient Pollution Control Project - Case Study
Client Romanian Ministry of the Environment Project name Integrated Nutrient Pollution Control Project Country Romania Background and aim project Romania became a member of the European Union in January 2007. As a consequence, the Romanian Ministry of the Environment set up the Integrated Nutrient Pollution Control Project. The aim of this project is to help the Romanian government to ...
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Remediation of Chlorinated Solvents - Case Study
Project Location: SW Florida Client: DoE Contamination: TCE, PCE, Vinyl Chloride, Toluene Site Size: 4+ Acres Project Description: Over the previous 13 years, the incumbent remediation contractor had attempted to removed a large chlorinated solvent plume extending 20+ feet below grade, covering a footprint of approx. 4+ acres, with an elaborate vertical well pump-and-treat system. The ...
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Assessment of groundwater vulnerability to nitrate pollution caused by agricultural practices
Environmental risk assessment is a step towards identification, analysis, and classification of risk factors and thus reduction of the possibility of adverse consequences. In this research, a novel approach for environmental risk assessment on groundwater pollution is applied. By combination of aquifer vulnerability DRASTIC map, pollution severity and prioritizing of the plain regions by the ...
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BOS 200, Hydrocarbons Application at an Active Gas Station - Case Study
Abstract: Trap and Treat® BOS 200® was applied at an active gas station in Europe with elevated dissolved phase contamination and NAPL impacts to protect the primary aquifer and cut off the dissolved phase plume from migrating off-site. Over the course of 4.5 years of monitoring, 92.4-99.9% reductions in Benzene were achieved in the treatment area (replaced) monitoring wells. Validation ...
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TCE contamination of the groundwater - Altus air force base
LOCATION: Altus Air Force Base, OklahomaPROJECT DATE: November 2001 to presentCLIENT: Air Force Center for Environmental Excellence (AFCEE) BACKGROUND: TCE contamination of the groundwater was found at the Altus AFB Site SS-17 at a depth of 7 to 20 feet below ground surface. The aquifer at Altus AFB consists unconsolidated fine-grained alluvial deposits, primarily clay, overlying a fractured ...
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Case study - Ozone sparging closure of an industrial VOC spill site adjacent to a water supply well site
Description An undocumented surface spill at an active manufacturing facility located adjacent to a public water supply well field released chlorinated volatile organic compounds (PCE, and its breakdown products: TCE, c-DCE, and VC) into soils and groundwater. The driver for site cleanup was three water supply wells located 200 feet downgradient of the site bounds. The chosen endpoint ...
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ITRC technology overview of passive sampling technologies
This document presents technical overviews of 12 passive sampling technologies. It describes each technology’s basis of operation, intended applications, advantages, limitations, and development status. Contacts for additional information are provided. This overview is an outgrowth of interest and information generated in preparation of the ITRC Technical and Regulatory Guidance for Using ...
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Groundwater Monitoring with the Waterra Inertial Pump
Untitled Document Abstract The Waterra Inertial Pump has been available for use in narrow diameter monitoring wells for several years. This device offers many advantages over other types of sampling equipment. Since this pump operates via a principle not used by any other type of device and is commonly constructed of materials not widely used in field sampling, some ...
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Dry cleaning plant: Boston, Massachusetts
Site Summary Dry cleaning solvents were found in the soil under a parking lot adjacent to a large dry cleaning plant located in a mixed commercial and residential suburb of Boston, Massachusetts. The contamination was traced back to a storm water catch basin in the parking lot which contained sediment and sludge with high concentrations of the dry cleaning solvent perchloroethene (PCE). The ...
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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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