Newman Zone emulsion was injected at a former adhesive manufacturing facility contaminated with TCE and 1,1,1-TCA. The source area consisted of small droplets of residual dense nonaqueous phase liquid (DNAPL) trapped in the sand and silt soils. Newman Zone emulsion was injected into the source area and in a barrier of down gradient points at the plume edge. A total of 52,000 pounds of Newman Zone was injected as a dilute emulsion containing 4.09% vegetable oil by volume.

Prior to the injection no total organic carbon (TOC) was detected with a detection limit of less than 2 mg/L. Three years after injection, TOC concentrations ranging from 20 mg/L to 61 mg/L have been measured in the treatment area indicating that the residual vegetable oil continues to supply electron donor. Immediately after injection, MW-6 had a TCE concentration of 60,000 µg/L, after three years TCE was ND and only VC remained at 38 µg/L. In MW-12, concentrations of 250,000 µg/L for TCE and 150,000 µg/L were detected immediately after emulsion injection. After three years of treatment only 1,100 µg/L and 870 µg/L respectively were detected for TCE and 1,1,1-TCA. Elevated concentrations of ethene and TOC indicate that the emulsion continues to support reductive dechlorination from a single injection after a period of over three years.

The Newman Zone emulsions combine the easy injection of soluble electron donors with the advantages of a slow release substrate that can support years of biodegradation with a single injection.

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