Treatment of a mixed CVOC and cr contaminated site using in situ chemical reduction (ISCR) and Stimulated Biotic Mineralization

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The implementation of efficient and cost-effective remedial solutions in the clean-up of impacted properties is paramount in returning brownfields and other impacted properties to viable use in the face of the recent real estate market declines. Historical site use of the Cleveland Flats project area included: a manufactured gas plant (circa. 1850), trucking terminal, & plating operations. As part of the overall project area remediation effort, sustainable and innovative in-situ remedial technologies were evaluated for use per proposed site redevelopment plans for the portion of the site formerly utilized for plating operations.

The soil and groundwater in this area of the Site was impacted by chlorinated organics as well as hot spot areas of elevated chromium. As a result of the remedial efforts, Voluntary Action Program (VAP) and Bureau of Underground Storage Tank Regulation (BUSTR) standards were met for the former plating operations area at the property by using the selected treatment technology of In-Situ Chemical Reduction (ISCR) and the associated post-ISCR performance monitoring. A combination of organic hydrogen donors, oxygen scavengers and iron was used to precipitate hexavalent chromium and reduce CVOC concentrations by stimulating biological activity capable of reductive dechlorination.

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