Accession Number:



Contaminant Flux Reduction Barriers for Managing Difficult-to-Treat Source Zones in Unconsolidated Media

Descriptive Note:

Technical Report,01 Oct 2013,30 Jun 2017

Corporate Author:

GSI Environmental Inc Houston United States

Report Date:


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The overall objective of this project was to evaluate if inexpensive flow reduction agents delivered via permeation grouting technology could help manage difficult-to-treat chlorinated solvent source zones. This approach aims to provide two benefits for improving groundwater quality at chlorinated volatile organic carbon CVOC sites by 1. physically reducing the mass flux of contaminants leaving the source zone by using permeation grouting, thereby reducing risk and making the downgradient plume more amenable for management by natural attenuation processes and 2 increasing the Natural Source Zone Depletion NSZD rate within the source by diverting competing electron acceptors around the source zone to create an enhanced reductive dechlorination zone ERDZ. This report describes the results of a Small-Scale Demonstration that achieved an average 64 reduction in flow through three small barriers. This was lower than the performance objective of a 90 reduction in flow and was likely caused by the low permeability of the silty sands in the test area. Finally, applications of one acre in area or more are significantly less costly than conventional in-situ remediation technologies 996K per acre and 21 per cubic yard for a one acre site.

Subject Categories:

  • Coatings, Colorants and Finishes
  • Physical Chemistry

Distribution Statement: