Understanding Mass Flux: From MPE System to MNA
Rachel Klinger, P.E., BCEE, Senior Principal Engineer, Geosyntec Consultants, Inc.
Co-Author: Jeffery Foster, City of Jacksonville
To support the refinement of the conceptual site model (CSM) for remedial system design, Geosyntec deployed innovative passive sampling devices in sediment and surface water to evaluate potential mass flux from MGP impacted groundwater to surface water receptors. Geosyntec’s comprehensive and integrated approach to understand the mass flux involved the use of three passive samplers, developed by SiREM and the University of Florida Contaminant Hydrology Laboratory (UF Lab). The passive samplers included polyethylene-based samplers (SP3™) developed by SiREM and sediment bed passive flux meters (SBPFM) and passive flux meters (PFM) developed by the UF Lab. Prior to sampler deployment, comprehensive Site reconnaissance activities were completed to assess sediment thickness, the presence and type of creek bed material, regions of groundwater upwelling through infrared sensor investigations and the vertical and horizontal extents of non-aqueous phase liquid (NAPL) impacts. The sampler deployment locations in sediment and surface water were conservatively chosen to represent areas where groundwater upwelling was most likely and mass flux would be highest. The results of the mass flux assessment indicate that while NAPL is present, MGP residuals are not discharging at concentrations exceeding Florida surface water cleanup standards. Not only did the work result in remedial costs savings but also demonstrated that passive remedial actions such as engineering and institutional controls would be an effective means of managing environmental risks. This presentation will discuss the importance of enhancing the CSM to support remedial decision making.
Rachel A. Klinger, P.E. is Senior Principal Engineer in the Geosyntec Jacksonville office. As a licensed Florida Professional Environmental Engineer, she loves challenging sites and working with collaborative teams. Her passion lies within remediating contaminated sites using innovative approaches and technologies in order to protect resources for future generations. With over thirteen years of experience as an environmental consultant Mrs. Klinger’s expertise focuses in environmental contamination assessments, remedial alternative evaluation, remedial system design, operation, and optimization, bid package and technical specifications preparation, construction management, agency correspondence and negotiations, groundwater modeling, and vapor intrusion assessment. Servicing federal, state, and local government entities as well as several power companies, Mrs. Klinger has diverse experience with properties impacted by chlorinated solvents, petroleum products, metals, pesticides, and manufactured gas residuals. In her free time she enjoys family outings on the water with her husband and two boys.