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WEBINAR | Off-Site Permeable Reactive Barriers and On-Site Residual Source Control: A Holistic, Low-Cost Solution to a 1,2-DCA Problem

January 11 @ 12:30 pm - 1:30 pm EST


Join us on January 11, 2023 for a technical webinar regarding Off-Site Permeable Reactive Barriers and On-Site Residual Source Control: A Holistic, Low-Cost Solution to a 1,2-DCA Problem.


A former Texas industrial site was impacted with 1,2-dichloroethane (1,2-DCA) through historical practices. Vadose zone source area soils were remediated through excavation, while residual contaminant mass present below the water table was managed by a property line pump-and-treat system. Subsequent investigations located a 4,000-foot-long 1,2-DCA plume extending off-site, running underdeveloped and undeveloped properties.


Parsons installed two hydraulic containment systems in the off-site plume to stop plume migration and enhanced bioremediation permeable reactive barriers (PRBs) to accelerate off-site plume collapse. Parsons also conducted a high-resolution source area characterization project to locate residual source mass in three dimensional space to actualize more aggressive source area remedy and reduce the site remedial timeframe.

Results and Lessons Learned

Within seven years of enhanced bioremediation PRB implementation, the off-site plume footprint had shrunk more than 50 percent, and 11 previously impacted offsite private properties were restored. Residual source mass on-site was accurately identified and precisely located such that aggressive on-site remedial measures could be evaluated and priced with greater certainty.


Brian Vanderglas, PG – Brian is a project manager with more than 34 years of experience in environmental restoration. He specializes in contaminant investigations and remediation projects.

Dan Griffiths, PG, CPG – Dan is Parsons’ PFAS Practice Director and Subject Matter Director for the Groundwater Restoration Practice. He has 25 years of experience, specializing in complex environmental site investigations, and remediation. He is a registered geologist and a Parsons Fellow.

To Join The Webinar

Join on your computer or mobile app
Click here to join the meeting
Or call in (audio only) +1.951.465.7634
Phone Conference ID: 474 371 227#

Please visit Parsons YouTube channel where video recordings of our previous technical webinars are available for viewing.



January 11
12:30 pm - 1:30 pm EST
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