| Title: |
Evaluating Natural Source Zone Depletion at Sites with LNAPL
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| Resource Type: |
document --> technical publication --> report
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| Country: |
USA
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| Year: |
2009 |
| Availability: |
Technology Overview LNAPL-1 April 2009
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| Author 1/Producer: |
Interstate Technology & Regulatory Council (ITRC)
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| Author / Producer Type: |
Agency, regulator or other governmental or inter-governmental body
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| Format (e.g. PDF): |
PDF
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| Size: (e.g. 20mb) |
1.4
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EUGRIS Keyword(s): |
Contaminated land-->Remediation options-->In situ treatment technologies
Contaminated land-->Remediation options-->MNA
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| Short description: |
Light, nonaqueous-phase liquid (LNAPL) refers to an organic
compound that is immiscible with, and lighter than, water (e.g.,
crude oil, gasoline, diesel fuel, heating oil). When an LNAPL is
released to the subsurface, it can migrate downward under the
force of gravity and laterally at the water table. Larger LNAPL
releases may migrate to the water table while leaving residual,
immobile LNAPL along the migration path. The constituents, or
chemicals, that compose the LNAPL may be removed over time by
various mechanisms, such as sorption, volatilization, and
dissolution. If not removed, the LNAPL 'body' can function as a
potentially long-lived source zone for secondary impacts to
adjacent soil, soil gas, and groundwater. A simple, quantitative
mass balance assessment of source zones could conclude that, if
some quantities of constituents are naturally being lost from
the source zone at some rate due to natural processes, then the
source zone itself must be depleting to some degree. The key
question then becomes, at what rate is this natural source zone
depletion (NSZD) occurring?
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Submitted By:
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Professor Paul Bardos WhoDoesWhat?
Last update: 11/05/2009
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