Project Description

ROS was solicited to undertake an alternative remedial technology review related to an existing groundwater pump & treat remedial system located at a former biological laboratory facility (inactive) treatment plant. The existing system represented significant annual O&M costs and was ineffective related to the source area. ROS completed a historical data review, conducted a focused delineation of impact areas, and completed an evaluation of natural attenuation parameters of the aquifer. ROS’ evaluation indicated that natural attenuation was restricted, predominantly due to persistent high source area concentrations. However, natural attenuation indicators were favorable. ROS personnel then interfaced with the client to amend and implement enhanced in-situ bioremediation (EIB) as part of a State-lead voluntary remediation program. The investigative program and EIB alternative implementation took place from 2002 through the present. The EIB remedial implementation included focused treatment within the delineated source area, along the centerline of the contamination, and at a downgradient location to serve as a passive barrier for the leading edge of the chlorinated contaminants. The results of the EIB remedy to-date have demonstrated significant mass reductions reduction in the source area, the establishment of reducing conditions and concentration reductions along the contamination centerline, and the establishment of an acceptable MNA remedy for the site.