Groundwater Relief System, Two Rivers MGP Site in Two Rivers, Wisconsin


Groundwater Relief System, Two Rivers MGP Site in Two Rivers, Wisconsin

Brian G. Hennings (Natural Resource Technology, Inc. (NRT) an OBG Company)
Frank Dombrowski (WEC Energy Group – Business Services)



Brian G. Hennings

Natural Resource Technology, Inc. (NRT) an OBG Company

Speaker Bio:

Mr. Hennings is a Senior Hydrogeologist at NRT, an OBG Company, with 15 years environmental consulting experience as a hydrogeologist for site investigation and remediation activities at sites with soil, groundwater, and sediment contaminated with petroleum products, chlorinated organics, coal gasification byproducts, metals, and PCBs. His MGP experience includes evaluating risk-based exposure pathways and modeling groundwater fate and transport on more than 20 former MGP sites regulated by State or USEPA Regions 4 and 5.


In 2015, Wisconsin Public Service Corporation completed a Time Critical Removal Action at their former Two Rivers MGP site (Site) in Two Rivers, Wisconsin to address Manufactured Gas Plant (MGP) contaminated materials through the United States Environmental Protection Agency’s (USEPA) Superfund Alternative Site (SAS) program. The selected remedy involved in situ solidification/stabilization of approximately 80,000 cubic yards of material, a significant portion of which was in a wetland and presented many challenges to the design team including a shallow watertable (between 0.5 and 3 feet below ground surface). The design team used MODFLOW to evaluate how the addition of impermeable solidified soil would affect groundwater flow and the potential for surface expressions of groundwater adjacent to the Site. This evaluation resulted in the development of an innovative groundwater relief system to provide storage capacity and direct groundwater via gravity to an area on Site where wetland soils remained. This project received the Wisconsin Chapter of American Society of Civil Engineers (ASCE) 2016 Engineering Achievement Award – Category B; and, the Wisconsin Chapter of American Institute of Professional Geologists (AIPG) 2016 Best Geosciences Project.


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