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RAPID ASSESSMENT OF REMEDIAL EFFECTIVENESS AND REBOUND IN FRACTURED BEDROCK: ESTCP COST AND PERFORMANCE REPORT
ESTCP Report ER-201330, 66 pp, 2017
A demonstration of the rapid assessment protocol was performed in shallow bedrock at Calf Pasture Point in Rhode Island, where TCE was the primary groundwater contaminant. While nearly 99% of the TCE was removed from the conductive fracture zone during initial flushing, substantial contaminant rebound (up to ~5% of TCE baseline concentration) was observed over the 5-month rebound period. The rate and extent of observed contaminant rebound was reasonably described using a matrix back-diffusion model and CSIA, both serving as lines of evidence that the observed rebound was due to matrix back-diffusion. The back-diffusion model further predicted that over a decade of treatment likely would be needed to reduce TCE concentrations by 99% in the conductive fractures. CSIA testing not only served as a line of evidence demonstrating that the rock matrix was the source of the observed rebound but also confirmed the occurrence of abiotic dechlorination of TCE and DCE within the rock matrix. https://www.serdp-estcp.org/content/download/46795/437525/file/ER-201330%20Cost%20&%20Performance%20Report.pdf
A demonstration of the rapid assessment protocol was performed in shallow bedrock at Calf Pasture Point in Rhode Island, where TCE was the primary groundwater contaminant. While nearly 99% of the TCE was removed from the conductive fracture zone during initial flushing, substantial contaminant rebound (up to ~5% of TCE baseline concentration) was observed over the 5-month rebound period. The rate and extent of observed contaminant rebound was reasonably described using a matrix back-diffusion model and CSIA, both serving as lines of evidence that the observed rebound was due to matrix back-diffusion. The back-diffusion model further predicted that over a decade of treatment likely would be needed to reduce TCE concentrations by 99% in the conductive fractures. CSIA testing not only served as a line of evidence demonstrating that the rock matrix was the source of the observed rebound but also confirmed the occurrence of abiotic dechlorination of TCE and DCE within the rock matrix. https://www.serdp-estcp.org/content/download/46795/437525/file/ER-201330
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