President, Technical Director and Corporate Support
Mc2 USA, Inc., a division of McMillan-McGee Corp.
Mr. LaChance offers over 18 years of experience in the In Situ Thermal Remediation field, focussing on the design, implementation and assessment of numerous sites in North America and around the globe.
John has extensive experience working with ET-DSP™, TCH, and SEE, including combining technologies to better address challenging site hydrogeologic and contaminant conditions. He has also lead research efforts on how to use sustainable energy and geothermal techniques to gently heat sites to speed up biological and abiotic reaction rates. John is currently involved with development and delivery of Mc2’s revolutionary new TCH technology known as IT-DSP™.
As a technical director, Mr. LaChance has been responsible for the design, oversight and implementation of over 50 ISTR projects for the remediation of a wide range of chemicals, including: CVOCs, BTEX, TPH, SVOCs, PAHs, PCBs Creosote, LNAPL and DNAPL, in both unconsolidated and fractured bedrock settings. John has also authored many papers and presentations on ISTR and the hydrogeology of DNAPL sites.
Assessing Performance and Making ISTR More Sustainable: A Multiple Lines of Evidence Approach For Determining When to Shut Down an In Situ Thermal Remediation System
In Situ Thermal Remediation (ISTR) is widely used for treating highly contaminated source zones at sites because of its effectiveness and quickness at removing a wide range of chemicals from a variety of geologic settings. ISTR can also be effective in the restoration of downgradient groundwater resources If the treatment zone fully encompasses the source zone. However, because ISTR is a source zone treatment technology, assessment of performance and determining when to shut down an ISTR system can be complicated due to the flux of contaminant mass into the treatment zone form outside areas. To achieve the most sustainable application of ISTR, it is therefore essential that ISTR performance be carefully assessed to determine when the contaminant mass has been sufficiently removed from the treatment zone and when the mass being removed is coming from outside areas.
This poster will provide an overview of how ISTR works and how it is typically used to treat contaminant source zones. The Multiple Lines of Evidence Approach for evaluating ISTR performance will also be introduced and applied to a recently completed ISTR project. The use of the MLEA was essential in tracking the performance of the ISTR system and in determining when the system could be shutdown.