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Gamlin, J., J. Cox, and A. Castor
Remediation 29(2):33-43(2019)

Three case studies are presented describing innovative subgrade biogeochemical reactors (SBGR) configurations recently developed and tested. The first case study addresses a site with groundwater deeper than 30 ft where an SBGR column configuration reduced TCE groundwater concentration from 9,900 µg/L to <1 µg/L within 15 months. The second SBGR is a recirculating trench configuration demonstration project supporting remediation of a 5.7-acre TCE plume, which has significant surface footprint constraints due to the presence of endangered species habitat. The third SBGR, constructed with a new amendment mixture, reduced groundwater contaminant concentrations in a petroleum hydrocarbon source area by >97% within about 1 year. New SBGR configurations that are planned for treatment of additional classes of contaminants are summarized as well as a discussion describing research being conducted to further understand and optimize treatment mechanisms within SBGRs. This article is Open Access at

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