VOCs Reduces Below Federal MCLs using HRC

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Courtesy of REGENESIS

Summary

Subsurface investigations at a dry cleaning facility revealed elevated levels of PCE and other regulated daughter products. HRC injection was chosen to accelerate the degradation of the entire range of VOCs. HRC slowly releases hydrogen, enhancing reductive dechlorination in an anaerobic environment. Additionally, HRC Primer, a less viscous version of HRC, was also used to reduce concentrations more rapidly by releasing lactic acid at a faster rate than HRC.
Initial baseline concentrations were measured at 551 ug/L (PCE), 139 ug/L (TCE), 522 ug/L (DCE), and <1 ug/L (VC). HRC Primer was injected in a grid pattern around and between MW-1 and MW-2, followed by HRC. Sixty days post HRC injection a sewer leak was discovered raising the concentrations of PCE in groundwater to 67,000 ug/L. Sixty-five days later the sewer leak was repaired (Figure 2) and approximately 120 tons of high concentration PCE contaminated soil was excavated (Figure 1). To address residual contamination in the soil 150 lbs of HRC was added to the excavation area prior to backfilling. A year later, an additional HRC application was undertaken to address any potential for rebound and/or vinyl chloride buildup.

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