HRC barrier applied successfully reduces TCE levels to non-detect in fractured bedrock site

Case study highlights

  • Based on successful pilot test results, full-scale implementation of HRC barrier was applied
  • TCE levels reduced by 99% within one year & at non-detect levels within 18 months
  • Innovative design was effective in addressing contaminants of concern

At a manufacturing facility in Virginia, HRC® was injected into a crystalline bedrock aquifer contaminated with TCE and its daughter products. The industrial site had been in operation for over 30 years. Groundwater flow was controlled by fractures in the crystalline rock with little to no permeability present beyond these fractures. Contamination levels had reached a high of 220 ppb of TCE. REGENESIS® recommended an HRC pilot test in conjunction along with excavation of the impacted geology.

The design using an HRC barrier focused on reducing TCE concentrations within a bedrock formation. Injection of HRC was accomplished using a single and double packer array and an appropriate delivery pump. The packer application method allowed HRC to be focused on the fractures controlling groundwater flow. A single packer system was used to apply HRC to the lower fracture (32 ft. bags) and a double packer system was used to apply HRC to the upper fracture zone (22-28 ft. bags). HRC was effectively injected at volumes ranging from 120-160 pounds per injection well.

HRC barrier applied successfully reduces TCE Levels to non-detect in fractured bedrock site
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