Restoration Tech Transfer Series

09 February 2022 1400 Eastern, 1300 Central

ANNOUNCEMENT

Name of Briefer: Dr. Chin Man Mok, Ph.D., Dr. Stephen Richardson, Ph.D., GSI Environmental

Title of briefing: Using High-Resolution Site Characterization Tools to Guide Design of a Particulate Carbon Injection at Site 25 Edwards AFB

Description: Fractured bedrock aquifers have proven to be difficult settings for remedial efforts. Due to the complex nature of these sites, groundwater plumes in fractured bedrock sites are typically more mature, dispersed over large areas, and penetrate deep into the subsurface; therefore, these sites often accrue high remedial and operational costs.  In recent years, particulate carbon amendments (PCAs) have become more common in the environmental remediation industry, offering an alternative in-situ remedy with the benefits of contaminant sorption (typically activated carbon) and destruction (via and oxidizing/reducing agent or serving as a medium for microbial growth in situ). Complex chlorinated volatile organic compound (CVOC) sites could benefit from these PCA technologies to potentially address key obstacles such as back diffusion, dilute plumes, and complex geological settings. When combined with a high-resolution site characterization (HRSC) tools, PCA products have the potential to drastically improve remediation efforts at complex sites.

As part of AFCEC-funded projects, surface-based and downhole characterization techniques were combined to further understand the complex nature of a large TCE plume in a fractured granitic bedrock aquifer at Site 25 Edwards AFB. A variety of characterization tools were employed to delineate high transmissivity zones and large aperture fractures within the aquifer for targeted injection of a PCA product. These include electrical resistivity profiling, tracer and potable water injection testing, vertical transmissivity profiling, vertical acoustic televiewer profiling, heat pulse measurements, pump tests, and collection of hydraulic connectivity data collection throughout the characterization period. As part of the pilot injection test, a ZVI-impregnated carbon product was emplaced into densely fractured zones within the aquifer between approximately 60 and 90 feet below ground surface using straddle packers and high-pressure injection pumps.  The presentation will provide an overview of characterization techniques, design and execution of the PCA pilot-test, results to-date, and lessons learned related to the work at Site 25 Edwards AFB.

ACCESS: Registration opens about 30 minutes prior on the day of the broadcast at the link below (on Adobe Connect system):

ceschool.adobeconnect.com/resttechxfer

If a Microsoft Windows security box asks for user name and password, just leave it blank and press OK

When accessing from off-base, please disconnect from VPN.  If accessing from personal device, suggest downloading the free Adobe Connect application.

If you are unable to attend the broadcast, the presentation slides are posted at:

https://www.milsuite.mil/book/docs/DOC-1102949

This event and future events are updated and posted on the AFIT website at: https://www.afit.edu/CE/index.cfm

POCs:

Joseph Dimisa, AFIT (joseph.dimisa@afit.edu)

C.J. Garcia, CTR, Booz Allen Hamilton (Garcia_Carlos3@bah.com)

Kurt Lee, AFCEC/CZRW (kurt.lee.3@us.af.mil

Dr. Kent Glover, Ph.D., AFCEC/CZTE (kent.glover@us.af.mil)