RemTEC Summit


Bernd Rehm

ReSolution Partners, LLC

Mr. Rehm received a MS. in hydrogeology from the University of Waterloo in 1977. In 2004 he co-founded Resolution Partners, LLC which performs treatability and laboratory studies and remediation design support to stakeholders in the design and implementation of soil and groundwater remediation.

Evaluation of cobalt in groundwater.

Groundwater monitoring at an industrial site identified cobalt in unfiltered water samples as exceeding a site-specific groundwater goal of 6.0 µg/L. Review of historical monitoring data suggested that the observed cobalt concentrations were a result of suspended solids identified by turbidity measurements (0 to 40 NTU) at the time of sample collection and acid preservation. A series of bench trials found cobalt present in the aquifer sediment, identified cobalt adsorbed to iron oxyhydroxides as the likely source of the cobalt, found the groundwater ORP controlled the presence of the oxyhydroxides in the water, found linear isotherms (Kd’s) for cobalt and demonstrated the adsorption was near irreversible sorption under site conditions. The information is being used to evaluate long-term remediation needs and options for the site.