A weight of evidence approach to in-situ bioremediation of groundwater in DNAPL source zones

AECOM installed and operated two enhanced in-situ bioremediation (EISB) systems between 2012 and 2015 to address chlorinated ethene impacts in groundwater. The EISB systems were designed to remediate dissolved phase concentrations of tetrachloroethene (PCE), trichloroethene (TCE), dichloroethene (DCE) and vinyl chloride (VC) at an industrial dry cleaning facility (Lawrence Dry Cleaners) and adjacent properties located in Waterloo, NSW, Australia. As part of a Management Order issued by the NSW Land and Environment Court, AECOM was required to technically evaluate remediation and monitoring data forming multiple lines of evidence and compare remediation progress against site specific remediation criteria and strict timelines. (author)