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RAP opportunity at U.S. Environmental Protection Agency     EPA

Understanding the Mass Discharge Behavior of Groundwater Source Zones


Center for Environmental Solutions and Emergency Response, Groundwater Characterization & Remediation Division

opportunity location
22.09.01.B7927 Ada, OK 748201198


name email phone
Michael C. Brooks 580.436.8982


A contaminant plume is conceptually the result of the relative balance between the mass discharge of the contaminant from the source and the rate at which the contaminant is attenuated in the down gradient environment (i.e., natural attenuation capacity). Consequently, contaminant risk can be managed through the favorable alteration of the source mass discharge, the rate of attenuation in the plume, or both. In this context, the source is broadly defined as any mass stored in the subsurface with sufficient capacity to sustain a contaminant plume and may include, for example, nonaqueous phase liquid or dissolved and sorbed contaminant mass in low hydraulic conductivity media. Past research efforts have focused on the impact of aggressive remediation technologies on dense nonaqueous phase liquid (DNAPL) source zones, and the relationship between DNAPL mass reduction and changes in source mass discharge. DNAPL impacted sites continue to be a focus area and research is in progress to understand the uncertainty of mass discharge measurements from sources zones, how to predict long-term mass discharge behavior, and the response of the contaminant plume to changes in source mass discharge at field sites. Research is also being conducted to understand how contaminated, low-conductivity regions within aquifers act as secondary contaminant sources and the long-term behavior of mass discharge from these regions. Field and laboratory based experimentation are being conducted with the support of numerical modeling studies.



Brooks MC, et al: Journal of Contaminant Hydrology 102(1-2): 140, 2008


key words
Aquifers; Groundwater contamination; Groundwater remediation; Source zones; Mass flux; Mass discharge; Back diffusion;


Citizenship:  Open to U.S. citizens and permanent residents
Level:  Open to Postdoctoral and Senior applicants


Base Stipend Travel Allotment Supplementation
$65,000.00 0.00

$1,365 Supplement for Medical Screening Exams


$10,000 Supplement for Seniors

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