Title: Evaluating Natural Source Zone Depletion at Sites with LNAPL 
Resource Type: document --> technical publication --> report 
Country: USA 
Year: 2009 
Availability: Technology Overview LNAPL-1 April 2009 
Author 1/Producer: Interstate Technology & Regulatory Council (ITRC) 
Author / Producer Type: Agency, regulator or other governmental or inter-governmental body 
Report / download web link (=direct link): http://www.itrcweb.org/Documents/LNAPL-1.pdf  
Format (e.g. PDF): PDF 
Size: (e.g. 20mb) 1.4 
EUGRIS Keyword(s): Contaminated land-->Remediation options-->In situ treatment technologies
Contaminated land-->Remediation options-->MNA
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? 
Link to Organisation(s): ITRC Interstate Technology & Regulatory Council
Submitted By: Professor Paul Bardos WhoDoesWhat?      Last update: 11/05/2009

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