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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Geochemical Applications to Site
Assessments and Remediation -
Case Studies
By
The performance of every engineering and environmental company conducting operations at a hazardous waste site is directly dependent on their ability to provide accurate and correct information regarding the type and concentrations of hazardous wastes encountered on the site, yet their choice of geochemical analytical techniques, both in the laboratory and on-site are often relegated to a fairly low priority to save on cost, particularly for real-time screening devices.
In addition, EPA methods are often used even if inappropriate for analysis of the specific components. For example, the PID detector is most often the instrument of choice for onsite screening in spite of the fact that it more often than not yields erroneous information. Gas chromatographic, derivative spectrometers, UV fluorescence, and infared TPH techniques are compared and contrasted for applications involving volatile hydrocarbons, chlorinated solvents, and older, less volatile components such as aged diesel or fuel oil.
Plume maps constructed from soil gas data measured
on specific, selected components offer a far more accurate
and cost-effective method for defining the horizontal extent
of most subsurface contaminants than are the limited
number of boreholes usually deployed. Boreholes should be
screened continuously and used primarily to determine the
vertical
extent of the contaminants encountered. Solvent
extractions followed by high-
resolution
capillary GC
methods are recommended to aid in the identification of the
specific contaminants found and to determine relative ages
and mixing of different products. This type of information is
of particular importance during remediation. Numerous
case studies will be used to demonstrate these concepts.
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