This ½ day workshop provides valuable insights on how the use of mass flux and mass discharge can improve remedial efficiency and reduce site management costs. This course includes a description of the concepts, uses, and measurement methods for mass flux and mass discharge, as well as a review of case studies demonstrating the benefits of using these data for site management.
Most decisions regarding contaminated groundwater sites are driven by contaminant concentrations. These decisions can be improved by also considering contaminant mass discharge and mass flux. Mass discharge and flux estimates quantify source or plume strength at a given time and location. Consideration of the strength of a source or solute plume (i.e., the contaminant mass moving in the groundwater per unit of time) improves evaluation of natural attenuation and assessment of risks posed by contamination to down gradient receptors, such as supply wells or surface water bodies. This information is valuable in virtually all aspects of contaminated site management.
In 2011 the US Intrastate Technology and Regulatory Council (ITRC) issued a Technology Overview document that described the concepts, uses, and measurement methods for mass flux and mass discharge, as well as a review of case studies demonstrating the benefits of using these data for site management.
Mass discharge is calculated by combining concentration data with the Darcy velocity of groundwater. By evaluating mass discharge at a site and thereby accounting for the combined effects of concentration and groundwater velocity on contaminant movement, managers will have a more complete understanding of the site, which will improve management decisions regarding site prioritization or remedial design and operations. For example, contaminant concentrations alone cannot provide a complete picture of the processes governing plume behavior because groundwater velocity (which varies across a site) is an integral component of plume behavior. However, incorporating mass discharge information into the conceptual site model (CSM) improves remediation efficiency and shortens cleanup times, particularly at sites with multiple source areas or where plumes cross multiple stratigraphic units.
Who should attend?
Practitioners, regulators, and others working on groundwater sites should attend this training course to learn more about various methods and potential uses of mass flux and mass discharge.
8:30am Welcome and introductions
10:00-10:30am Afternoon tea
12:30 Close for lunch
Naji Akladiss, Maine Department of Environmental Protection
Heather Rectanus, Battelle
Charles Newell, GSI Environmental Inc
Tamzen Macbeth, CDM Smith
Registration and Fees
Registration fees for the half day workshops are $350. This includes workshop registration, all catering, workshop materials and handouts.