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More Bio post ERH - Proposal Review (Washington)

An active site in Seattle with high levels of TCE was treated with Electrical Resistance Heating (ERH) to remove DNAPL and reduce high concentration areas. While the site was cooling, I was asked to review the four post ERH bioremediation proposals that the main consultant had solicited. Proposals were critiqued for approach, technical merit, cost and proponent experience.

I also reviewed the selected contractor's work plan and reviewed initial monitoring data. Two donor injections were completed in 2014 for both deep and shallow zones after the temperature had cooled to below 40 degrees C in each. Monitoring is ongoing.