monitoring well Articles

  • Locate buried monitoring wells case study

    A Phase II Environmental Site Investigation was being conducted at a gasoline station in Fort Myers, Florida. In order to minimize costs, our client intended to use several existing on-site monitoring wells rather than installing new wells. However, five of the existing wells had been covered with asphalt and were no longer visible. GeoView was tasked with performing a shallow geophysical study ...


    By GeoView, Inc.

  • The first monitoring well in Engbertsdijksvenen is a reality

    On Wednesday 20 December 2017, the first monitoring well of the groundwater monitoring network Engbertsdijksvenen was realised on the parcel of landowner Wilharms in Vriezenveen. This monitoring well serves to monitor the effects of the measures required for the Nature Objectives of the Engbertsdijksveen. One of these goals is the recovery of living high moor. In addition to this monitoring well, ...


    By Eijkelkamp Soil & Water

  • Abandoning Monitoring Wells: Safety Issues

    Monitoring wells are typically constructed to gauge the extent of contamination, assess water quality and conduct other hydrogeologic studies. Depending on its objective, the monitoring well may remain in use or may be abandoned permanently. When declared inactive, the well is many a times left as it is. Open unused wells are hazardous to life and environment: • Contamination may spread from one ...

  • Use of geostatistics to evaluate the monitoring well network of a TCE plume

    This paper summarises the use of geostatistics to evaluate an existing network of wells in a groundwater monitoring program. The primary objective was to evaluate whether selective well removal would result in a comparable characterisation of a trichloroethylene (TCE) plume. For adequate characterisation, it is important to retain enough wells to evaluate areas with higher concentrations and to ...


    By Inderscience Publishers

  • Case study – BTEX contamination pilot study - gasoline

    Site: Convenience Store – Pilot Study Contaminant: BTEX (gasoline) Soil Type: Silty Clays Injection Cost: $24,000 (material & labor) Plume Size (before): 1150 sq. ft. Thickness: 8 feet (14 to 22 feet bgs) Plume Size (after): Contamination only exists at edge near heavily contaminated, untreated areas. Groundwater: About 16 feet bgs Goals: The intent of ...

  • ANN-based approach for the estimation of aquifer pollutant source behaviour

    The problem of identifying an unknown pollution source in polluted aquifers, based on known contaminant concentration measurements, is part of the broader group of issues called inverse problems. This paper investigates the feasibility of solving the groundwater pollution inverse problem by using artificial neural networks (ANNs). The approach consists first in training an ANN to solve the ...


    By IWA Publishing

  • Case Study of Petrox® Bioaugmentation to Remediate Pesticides in Ground Water to Part Per Trillion Concentrations

    This case study of bioaugmentation demonstrates that Petrox bioaugmentation can achieve the very low remediation goals set for pesticides in ground water – quickly and cost effectively.  After three injections of Petrox®, the contaminant concentrations were reduced by 99% in less than 9 months.  Project highlights are:  Source area maximum dieldrin ...


    By CL Solutions, LLC

  • 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 accurately ...


    By Solinst Canada Ltd.

  • 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 ...


    By Solinst Canada Ltd.

  • Using solver to determine vertical groundwater velocities by temperature variations, Purdue University, Indiana, USA

    Vertical groundwater velocities can be estimated based on directions of groundwater thermal gradients. Temperature-depth profiles were obtained from 12 monitoring wells at 3 different times of the year (Fall, Winter, and Spring) in West Lafayette, Indiana (USA) mainly on the Purdue University campus. Microsoft Excel Solver was used to match plots of groundwater temperature distribution in the ...


    By Springer-Verlag GmbH

  • Ground water sampling bias observed in shallow conventional wells

    EPA’s Hutchins and Acree present the results of their field research showing the misleading data that are often generated using samples collected from conventional monitoring wells. They conclude that “These data provide an additional example where cluster well points or other methods of obtaining depth-discrete samples would be required to provide an accurate assessment of either the extent of ...


    By Solinst Canada Ltd.

  • 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 ...


    By Hargis + Associates Inc

  • Pilot Scale Remediation of BTEX, MTBE, Naphthalene, Isopropylbenzene, and Trimethylbenzene

    Site Summary Michigan’s Department of Environmental Quality (Environmental Response Division) has spearheaded efforts to clean up concentrations of petroleum compounds associated with two former underground storage tanks. A field pilot study was performed to determine the effectiveness of ORC in treating the on site petroleum hydrocarbon contamination.Approximately 3,720 lbs. of ORC were ...


    By Regenesis

  • Difficulties and modifications in the use of available methods for hydraulic conductivity measurements in highly clogged horizontal subsurface flow constructed wetlands

    Despite the fact that several authors consider the available measurement methods of hydraulic conductivity (ks) suitable for a good representation of the bed condition and clogging potential in horizontal subsurface flow constructed wetlands, others have questioned their adequacy. In this work, hydraulic conductivity measurements with conventional and modified methods were ...


    By IWA Publishing

  • 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 ...


    By EON Products Inc.

  • Groundwater Plume, Source and Risk Identification Using Passive Soil Gas

    Abstract The results from sixty passive soil gas (PSG) samplers placed at a grain silo and mixed-use industrial facility with a known chlorinated solvent release aided with the rapid investigation time-schedule. The samplers were used to determine potential sources, plume extent and vapor risks in areas beyond the previous discrete soil sampling and permanent groundwater monitoring well ...

  • Reductive Dechlorination Using HRC Reduces VOCs Towards MCLs

    Site Summary As part of the EPA Superfund Innovative Technology Evaluation (SITE) program, a pilot-scale study was conducted to determine the effectiveness of using HRC to reduce TCE concentrations in groundwater at the Fisherville Mill site in Grafton, MA. The Fisherville site is characterized by TCE contamination in a sand and gravel aquifer and is considered a brownfield site. Prior to HRC ...


    By Regenesis

  • Partially penetrating slug tests in an unweathered till layer

    This research improves field based estimates of aquitard compressibility and permeability. A semianalytical model of partially penetrating, overdamped slug tests achieves this objective. The short term solution is an existing fully penetrating model, the long term solution is the polar residue of an inverse Laplace transform, and an exponential spline function patches the solutions together. ...


    By IWA Publishing

  • 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 ...


    By Solinst Canada Ltd.

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