SOIL OXIDANT BLENDING- ISS/ ISCO BROWNFIELD SITE – ATLANTA, GA
Contaminants:
PCE, TCE, cis-1,
2-DCE
Treatment:
Soil Blending-ISS/ISCO injection
Site Status:
2018-2019; January 2020 Brownfield LOL
The site is a former dry cleaner with soil concentrations exceeding Type 3 RRS for PCE, TCE, andcis-1,2 DCE. The treatment area was 2,155 sf with a vertical profile of 5-17’.
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Due to elevated soil concentrations,(>20ppm) the owners desired to preserve the building, and depth of impact (17’), a multi-phase ISCO/soil oxidant (combined remedy) plan was developed by EDEN.
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The remediation plan included soil removal, on-site soil blending and stabilization guided by a treatability study, permanganate ISCO injections around building footers, and ISCO using 150 injection points.
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Soils were removed using an excavator in rolls offs diameter auger borings. Soils failing TCLP were treated using a combination of CHP, sodium percarbonate, and calcium peroxide activated with ferrous sulfate with meta-kaolin added as a hardening agent.
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1,200lbs of potassium permanganate combined with gravel was applied at the base of the excavation for long term groundwater treatment.
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5,935 gallons of potassium permanganate was injected into150 closely spaced injection points for treatment inside the building. Blended soils passed TCLP testing, allowing for Subtitle D disposal. Confirmatory soil samples indicated commercial RRS were achieved. In addition, there was a significant reduction in dissolved PCE. Final Brownfield Limitation of Liability received January 2020
Ready to close your site? Our professionals are well acquainted with the "pit falls" of soil and groundwater remediation. Here at Eden, we understand that combined remedial solutions are often required.
We are committed to offering not only front end assistance but follow-up services for the life of your project to reach site closure.