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• September 28, 2017

Most decisions at groundwater contamination sites are driven by measurements of contaminant concentration -- snapshots of contaminant concentrations that may appear to be relatively stable or show notable changes over time. Decisions can be improved by considering mass flux and mass discharge. Mass flux and mass discharge quantify the source or plume strength at a given time and location resulting in better-informed management decisions regarding site prioritization or remedial design as well as lead to significant improvements in remediation efficiency and faster cleanup times. The use of mass flux and mass discharge is increasing and will accelerate as field methods improve and practitioners and regulators become familiar with its application, advantages, and limitations. The decision to collect and evaluate mass flux data is site-specific. It should consider the reliability of other available data, the uncertainty associated with mass flux measurements, the specific applications of the mass flux data, and the cost-benefit of collecting mass measurements.

The ITRC technology overview, Use and Measurement of Mass Flux and Mass Discharge (MASSFLUX-1, 2010), and associated Internet-based training provide a description of the underlying concepts, potential applications, description of methods for measuring and calculating, and case studies of the uses of mass flux and mass discharge. This Technology Overview, and associated internet based training are intended to foster the appropriate understanding and application of mass flux and mass discharge estimates, and provide examples of use and analysis. The document and training assumes the participant has a general understanding of hydrogeology, the movement of chemicals in porous media, remediation technologies, and the overall remedial process. Practitioners, regulators, and others working on groundwater sites should attend this training course to learn more about various methods and potential use of mass flux and mass discharge information.

• Naji N. Akladiss, P.E, Maine Department of Environmental Protection (naji.n.akladiss@maine.gov)
• Ryan Wymore, CDM Smith (wymorera@cdmsmith.com)
• Tamzen Macbeth, CDM Smith(macbethtw@cdmsmith.com)
• Alex MacDonald, California Water Boards (amacdonald@waterboards.ca.gov)
• Alec Naugle, California Water Board, San Francisco Bay Region (anaugle@waterboards.ca.gov)
• Charles Newell, GSI Environmental Inc. (cjnewell@gsi-net.com)

• Mary Yelken, ITRC Training Program Support (myelken@theyelkengroup.com)
• Juliana Cheatham, ITRC Training Program Support (jcheatham@theyelkengroup.com)

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