PCE and TCE Remediation Continues Years After Injection


Courtesy of Regenesis

Site Summary

Subsurface investigations at this dry cleaning facility revealed elevated levels of PCE and TCE in groundwater and soil. Accelerated bioremediation using HRC was selected for use at the subject site as it offered a groundwater remediation method that would not interrupt on-going facility operations while effectively supporting the degradation of the contaminants. Approximately 250 cubic yards of contaminated overburden soil was excavated from the source zone down to the bedrock outside of the building’s footprint (Figure 1). A Soil Vapor Extraction (SVE) stockpile was built and contaminated soil was treated using thermally enhanced vapor extraction. Immediately following the soil excavation, HRC was manually spread inside the excavated area prior to backfilling and injected into the bedrock aquifer. Subsequently, HRC was again injected into the bedrock aquifer and applied above the bedrock through injection and by a drip feed inside (Figure 2) and outside of the building upgradient of previously treated areas.

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