aquifer contaminated Articles

  • Abandon Well Contaminate Aquifer

    This article points out the magnitude of this urgent issue.  An abandoned well becomes an opening into an aquifer which is likely to introduce contamination.  Filling it in is a critical component of protecting the well water supply.  Click here to read the ...

  • TCE/Fractured Bedrock Remediation in VA

    Site Summary At a manufacturing facility HRC was injected into a crystalline bedrock aquifer contaminated with TCE and its daughter products. Groundwater flow at this site is controlled by fractures in the crystalline rock with little or no permeability present beyond these fractures. The industrial facility had been in operation for over 30 years. Contamination levels reached 220 ppb of TCE so ...


    By Regenesis

  • A GIS-based methodology to delineate aquifer recharge areas

    A GIS-based methodology to delineate risk areas for contamination of groundwater resources is presented by identifying recharge conditions to the aquifer. Identifying the recharge areas is based upon surface and subsurface geologic conditions that may control the risk of potential oil spill contaminants into the aquifer. This study uses the Chicot aquifer system in southwest Louisiana as a pilot ...


    By Inderscience Publishers

  • In situ remediation of BTEX, MTBE and TPH using EAS as a terminal electron acceptor

    EAS, A Paradigm Shift in the Remediation of Petroleum Hydrocarbons The conventional wisdom for remediation of aquifers contaminated with petroleum hydrocarbons (PHCs) is to add oxygen. A recent EPA / British Petroleum study, however, concluded that most hydrocarbon plumes are anaerobic and depleted of sulfate and, therefore, adding oxygen is disadvantageous. Other studies have drawn ...


    By True Blue Technologies, Inc.

  • Bioremediation of 1,2-dichloroethane with INTEROX® case study

    At a chemica plant in a harbour area, the surface aquifer was contaminated with 1,2-dichoroethane (1,2-DCEa) which had to be remediated. Site characterisation, and laboratory tests demonstrated that oxygen was the limiting factor for the insitu biodegradation of 1,2-DCEa. The remedial strategy was based on flushing with simuftaneous aerobic biodegradation enhancement. Biodegradation was stimuated ...


    By Solvay

  • Investigating cross-contamination of aquifers

    Shallow aquifers can cross-contaminate deeper aquifers through penetration of an intervening aquitard, via sandy intervals in the aquitard, along well casings, across long well screens, or around aquitard pinchouts. Distinguishing among these potential pathways requires the use of evaluation tools that may support or eliminate certain pathways. These tools include groundwater gradient and ...


    By Springer-Verlag GmbH

  • Cryptosporidium infection, onsite wastewater systems and private wells in the arid Southwest

    Few prior studies have examined the potential health risks from transmission of enteric parasites via aquifers contaminated by wastewater from onsite systems. A cross-sectional study of 600 residents in households served with either onsite wastewater systems and private wells or city sewer/water systems in three different sites in central New Mexico compared serological responses to ...


    By IWA Publishing

  • 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

  • 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.

  • Estimating the fates of organic contaminants in an aquifer using QSAR

    The quantitative structure activity relationship (QSAR) model, BIOWIN, was modified to more accurately estimate the fates of organic contaminants in an aquifer. The predictions from BIOWIN were modified to include oxidation and sorption effects. The predictive model therefore included the effects of sorption, biodegradation, and oxidation. A total of 35 organic compounds were used to validate ...


    By IWA Publishing

  • Benefits and characteristics of W-Tank digesters®

    The digester is an important ally in different projects. It is common to use in areas that lack access to sewage systems, significantly benefits the environment by avoiding aquifer contamination, and is even a perfect choice for construction projects because of ease of installation. The biodigestor has an inlet for the organic material, a space for ...


    By Toro Equipment S.L.

  • In Situ Chemical Oxidation Remediation Pilot Study Of A Karst Bedrock Aquifer Contaminated With Chlorinated Solvents

    ABSTRACT A pilot study to evaluate an innovative in situ treatment technology was implemented at Letterkenny Army Depot, Chambersburg, Pennsylvania, for a limestone bedrock aquifer contaminated with chlorinated solvents. This technology destroys VOCs in groundwater, utilizing a network of injection points to deliver a solution of hydrogen peroxide (50%), catalysts, and surfactants. The ...


    By Weston Solutions, Inc

  • Enhanced Bioremediation of Chlorinated Solvents (PDF)

    Enhanced in situ bioremediation of chlorinated solvents in groundwater has been successfully demonstrated at many sites by supplying lactic acid as an electron donor. The source of lactate for these successful pilot tests is Hydrogen Release Compound (HRC), a polylactate ester specially formulated for slow release of lactic acid upon hydration. HRC has been delivered to chlorinated ...


    By Regenesis

  • Confined aquifer responses to pumping – potential impacts on plume migration

    Pressure waves are transmitted in confined aquifers with relatively little damping compared with surficial phreatic aquifers. Confined aquifers may therefore be subject to abrupt and far-reaching changes in the rate and direction of groundwater flow due to changes in well pumping. Where there is a mechanism for contaminants to reach a confined aquifer, the contaminant migration within the aquifer ...

  • Perchlorate, Chrome 6 and Freon-113 Remediation

    Site Summary At an ordnance facility in Hollister, CA, the groundwater aquifer was found to be contaminated by a variety of compounds, the more significant compounds being perchlorate, Chrome-6 and Freon-113. Perchlorate was detected at levels of 1,600 to 7,500 ug/L, Chrome-6 at levels of 15 to 210 ug/L, and Freon-113 at levels of 180 to 430 ug/L. The aquifer was composed of a medium to fine ...


    By Regenesis

  • Bioaugmentation for accelerated in-situ anaerobic bioremediation

    A successful anaerobic bioaugmentation was carried out on a trichloroethene (TCE)-contaminated aquifer at Dover Air Force Base, DE, using a microbial enrichment culture capable of dechlorinating TCE to ethene. A hydraulically controlled pilot system 12   18 m was constructed 15 m below ground surface in an alluvial aquifer to introduce nutrients and substrate into the groundwater. ...


    By Terra Systems, Inc. (TSI)

  • Replacement of Expensive Groundwater Pump and Treat System Pump and Treat System with Bioremediation

    Introduction Prior operations at a former Microwave electronics facility inSunnyvale, California, resulted in tetrachloroethene (PCE), trichloroethene ( TCE), cis-1,2-dichloroethene (DCE) and vinyl chloride (VC) impacts to soil and groundwater. In 1985, a groundwater pump and treat (P&T) system was implemented to address groundwater impacts. In 1996, CDM began ...


    By Regenesis

  • Estimating contaminant-flushing rates for heterogeneous aquifers

    Groundwater remediation evaluations typically include cleanup time projections. Current batch flushing-rate equations and analytical models often used to estimate groundwater cleanup rates typically underestimate cleanup times, with a major factor the flawed assumption of aquifer homogeneity. Numerical modelling of groundwater flow and contaminant transport is a time-intensive and costly ...


    By Inderscience Publishers

  • Practitioner Spotlight--Dan Keltner

    Name Dan Keltner Office Naperville, IL (Chicago) Practice Area Transaction Support Areas of expertise ...


    By Antea Group - USA

  • Case Study - Groundwater: 600 meter Deep Survey

    Thika, Kenya Survey date: February 13, 2006 Location: Thika, Kenya Instrument: SuperSting R8/IP with Switch Box 84 and AGI resistivity imaging cable and electrode stakes with spring Electrode geometry:  combined dipole-dipole, schlumberger and pole-dipole array (20 m spacing for 646 m exploration depth) Software:  ...


    By Advanced Geosciences, Inc.

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