H&L Plating and Grinding, Inc. (2007-2015). Turn-key Site Remediation project. Project included developing a work plan to enter the Site into the Indiana Voluntary Remediation Program (VRP) with a scope of work that includes: site investigation (including lead and asbestos); waste characterization; waste management and disposal; equipment decontamination and relocation; decontamination of structures; structure demolition; shallow soil in situ remediation; deep soil in situ remediation; design and construction of an industrial wastewater treatment system; installation of a groundwater extraction and re-injection system; remote telemetry data acquisition; and long term monitoring for closure. The project was completed in 2015 for just less than $4.5 million dollars. Primary contaminants included hexavalent chromium, antimony, nickel, arsenic and lead. The remedy was implemented without deleterious changes to manganese and iron (secondary metals) present in groundwater at the Site.
The above table shows the concentrations of six of the metal contaminants with time in the effluent from the column treated with the high dose of FerroBlack®-H.
The bench-scale treatability study consisted of testing the best-performing amendment from the batch studies (FerroBlack®-H) in column reactors, to more closely simulate a PRB or a reactive zone in the field. Three PVC column reactors were set up to test a low and high dose of both FerroBlack®-H, plus a Control column with nothing added. Each of the flow-through column was carefully packed with homogenized soil from the Site into which the appropriate amendment dose was mixed. Site groundwater was then passed through the columns at a specified flow rate, and the effluent pore water from each column was analyzed for all the COCs at the Site. In this way, each column simulated a PRB, and allowed the effectiveness of each amendment dose to remove COCs from the Site groundwater and prevent leaching of COCs from the Site soil to be quantified.