The Engineering Forum (EF), established in the late 1980s, is a group of engineers and scientists that supports the Superfund and RCRA programs in each of the ten EPA Regional Offices. As one of the EPA Technical Support Project’s (TSP) three technical forums, the EF is a medium for exchanging technical information regarding innovative site cleanup and characterization technologies. Monthly technical talks focus on site-specific engineering problems encountered, alternatives and solutions, and lessons learned. After each presentation, information regarding upcoming events and training are discussed and time for an Open Mic discussion is provided. If you are a Superfund, Resource Conservation and Recovery Act (RCRA), Brownfields, state or federal environmental professional who is interested in solving technical issues, register for any technical talks listed below that interest you and join the discussion!
Presentations are specifically designed for EPA staff including RPMs, OSCs, Corrective Action Managers, Superfund and Technology Liaisons, Chemists, Biologists, Physical Scientists, and Engineers from within EPA regions, program offices, laboratory system, and headquarters personnel as well as environmental professionals from state agencies, the U.S. Army Corps of Engineers, U.S. Dept. of Energy, and other federal agencies of all experience levels. THIS TRAINING IS NOT OPEN TO ACADEMIA, CONTRACTORS, CONSULTANTS OR OTHER PRIVATE ENTITIES.
We will try to meet any special accommodations necessary for our participants as possible if given a minumum of two weeks notice. You will be prompted to indicate if you need any special accommocations upon registering for these events.
*This training is offered free of charge to all registrants who are confirmed to attend. One CLP will be issued for each session attended when you register and log on with the registration link provided to enable your attendance to be confirmed.*
Matrix diffusion describes processes whereby contaminants infiltrate (forward) into unfractured or minimally fractured matrix regions of bedrock and other low permeability geologic units (i.e., forward diffusion), while exfiltrating (back diffusion) from these same regions under different conditions, usually at later time periods. Contaminant fluxes resulting from back-diffusion processes in low permeability regions can be problematic, and in some cases result in circumstances that limit or inhibit effective remediation at hazardous waste sites. Existing methods to measure site-specific conditions of back-diffusion are limited, highly specialized, expensive, and commonly require installation of new core holes. This presentation describes methods and techniques the authors recently developed to measure in-situ rock-matrix back-diffusion utilizing existing open boreholes in fractured rock to conduct systematic backward diffusion experiments. Testing is performed over short intervals of the open boreholes (approximately 1 meter) called test zones by physical isolation using a modified straddle packer system. A detailed case study describes the new method and its successful application towards quantification of back-diffusion of chlorinated VOCs at a remedial site.
Bill Brandon, U.S. EPA - Region 1
Phil Harte, USGS
Times listed are Eastern.