Design and Construction Issues at Hazardous Waste Sites Webinar on Successful Remedial Design, Session 1 (May 12, 2021)

 
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The Society of American Military Engineers (SAME) Denver Post and Philadelphia Post along with the US Environmental Protection Agency (EPA) are hosting a series of webinars based on talks given at recent Design and Construction Issues at Hazardous Waste Sites (DCHWS) Symposiums. The mission of the DCHWS symposiums is to facilitate an interactive engagement between professionals from government and the private sector related to relevant and topical issues affecting applications of engineering and science associated with cleaning up hazardous waste sites. The symposiums also serve as a platform to facilitate the exchange of information, encourage dialogue, share experiences, and build and enhance communication among design and construction professionals. This session will include the following presentation: Site Assessment, Design Considerations, and Performance Results from a Innovative Barrier Application at a Large Chlorinated Plume in Texas A large chlorinated solvent plume situated in a cemented sandstone bedrock aquifer contaminated private water wells under a residential neighborhood in Texas. Typical HRSC techniques were not feasible due to the aquifer characteristics. Long-term field data will demonstrate how an innovative CSM assessment and barrier design approach achieved MCLs and prevented further off-site migration. Groundwater extraction from private, off-site wells resulted in a large chlorinated solvent plume that needed to be addressed to prevent further off-site migration. Remedial approaches considered included groundwater pump and treat, enhanced reductive dichlorination (ERD), and an in situ carbon sorption/biotreatment. A colloidal activated carbon (CAC) barrier provided the most cost-effective solution by rapidly preventing off-site migration and preventing biofouling of the downgradient potable wells that may develop from typical ERD in situ remedies. This presentation will focus on several innovative approaches to identify contaminant mass flux and the use of an innovative model to predict remedial performance. Performance monitoring data from over 30 months from multiple monitoring wells shown excellent results from the CAC barrier, with the results meeting the project performance objectives (below MCLs) and preventing further contaminant downgradient migration. To view this archive online or download the slides associated with this seminar, please visit http://www.clu-in.org/conf/tio/DCHWS15-A_051221/

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