Overview
As part of a real estate transaction, our client was committed to remediating chlorinated ethane impacts within the groundwater to below the applicable Standards. The concentrations of the compounds of concern were:
- 1,1,1-TCA (maximum concentration of 11,000 μg/L)
- 1,1-DCA (maximum concentration of 1,100 μg/L)
Scope of Work
- Acquired all relevant permits to complete the remediation program.
- Designed and optimized an in- program to maximize treatment efficiencies.
- Implemented a program that minimized capital expenditures and infrastructure.
- Monitored pre- and post-injection treatment parameters.
The Vertex Approach
- Enhance existing natural attenuation processes already occurring
- Reductive dechlorination
- Temporary injection points
- Injections under moderate pressure
- Injection of multiple reactive compounds
- > 1,250 kg of EHC & EHC-A
- Injections completed using direct push
- Grid of 27 injection points
Outcome
Successful installation of a reactive zone via injection- Hydrogen generating conditions created:
- Redox decreased 500 mV within one week
- pH remained neutral
- Long-term reactive zone created with zerovalent iron
- Concentration reductions after 1 injection:
- 1,1,1 TCA – 74%