Naturally occurring abiotic dechlorination of TCE in rock matrices

Chlorinated solvents in rock matrices can serve as a long-term contaminant source in fractured bedrock aquifers, sustaining groundwater plumes for extended periods of time. The intensity and longevity of the groundwater plume will be impacted by the diffusional flux between the rock matrix and adjacent conductive fractures, as well as the fate of contaminants residing within the rock matrix itself. Naturally occurring degradation processes, particularly abiotic dechlorination processes, have hitherto not been investigated in detail to assess potential impacts on processes such as uptake into the rock matrix, and the potential for back-diffusion to sustain plumes. (author)