Contaminant Flux Reduction Barriers for Managing Difficult to Treat Source Zones in Unconsolidated Media
Abstract
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 technologies($996K per acre and $21 per cubic yard for a one acre site).
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 20, 2017
- Accession Number
- AD1040166
Entities
People
- Brian Strasters
- Elaine Higgins
- Poonam Kulkarni
Organizations
- GSI Environmental (United States)