Contaminant Flux Reduction Barriers for Managing Difficult to Treat Source Zones in Unconsolidated Media
Technical Report,01 Oct 2013,01 Jun 2017
GSI Environmental INC Houston United States
Pagination or Media Count:
The overall objective of this project was to evaluate if inexpensive flow reduction agents deliveredvia permeation grouting technology could help manage difficult-to-treat chlorinated solvent sourcezones. This approach aims to provide two benefits for improving groundwater quality at chlorinatedvolatile organic carbon CVOC sites by 1. physically reducing the mass flux of contaminants leavingthe source zone by using permeation grouting, thereby reducing risk and making the downgradient plumemore amenable for management by natural attenuation processes and 2 increasing the Natural SourceZone Depletion NSZD rate within the source by diverting competing electron acceptors around thesource zone to create an enhanced reductive dechlorination zone ERDZ. This report describes theresults of a Small-Scale Demonstration that achieved an average 64 reduction in flow through threesmall barriers. This was lower than the performance objective of a 90 reduction in flow and waslikely caused by the low permeability of the silty sands in the test area. Finally, applications of oneacre in area or more are significantly less costly than conventional in-situ remediation technologies996K per acre and 21 per cubic yard for a one acre site.
- Water Pollution and Control