STP963

    Investigations of Techniques for Purging Ground-Water Monitoring Wells and Sampling Ground Water for Volatile Organic Compounds

    Published: Jan 1988


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    Abstract

    An experiment designed to detect and quantify contamination of simulated ground-water samples with stagnant water in a monitoring well found that an average of about 2 to 4% of the water pumped from locations above the screen and an average of about 1% of the water pumped from within the screen of the monitoring well came from the stagnant water above the pump inlet even when effects of drawdown were precluded. All runs showed peaks of contamination up to 8% or higher. The amount of contamination is highly variable over a short time frame. An experiment to identify the effects of the sampling device and the tendency of a compound to evaporate from water solution on the loss of the compound during the ground-water sampling process revealed that the potential for losses rises as the tendency to evaporate from solution increases, and that up to 30% loss can occur under certain circumstances. Less than 10% loss is more typical with the techniques normally used for such sampling. Little indication of differences between commonly used sampling devices was found.

    Keywords:

    ground water, monitoring well, sampling, purging, tracer study, volatile organic compounds (VOC), pump, bailer


    Author Information:

    Unwin, J
    Research engineer and research assistant, National Council of the Paper Industry for Air and Stream Improvement, Inc. (NCASI), Western Michigan University, Kalamazoo, MI

    Maltby, V
    Research engineer and research assistant, National Council of the Paper Industry for Air and Stream Improvement, Inc. (NCASI), Western Michigan University, Kalamazoo, MI


    Paper ID: STP44863S

    Committee/Subcommittee: D19.06

    DOI: 10.1520/STP44863S


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