Groundwater Modeling and Monitoring Results for a Combined Thermal and In-Situ Bioremediation Remedy
Groundwater Modeling and Monitoring Results for a Combined Thermal and In-Situ Bioremediation Remedy
Presented on Monday, December 3, 2018
MODFLOW and MT3DMS models originally developed for contaminant fate and transport for the site and proximal portion of the downgradient plume area were converted into a heat transport model to evaluate the evolution of groundwater temperature over time and distance from the thermal treatment area. We present modeled temperatures and field data for downgradient temperatures associated with a source area thermal remedy, and the influence of the thermal front on a combined anaerobic bioremediation / chemical reduction remedy implemented in the proximal portion of the downgradient plume. The objective was to take advantage of the increased microbial activity and CVOC desorption to enhance bioremediation of the chlorinated plume immediately downgradient of the source area. Permeable reactive barrier zones comprised of a mixture of zero-valent iron and organic carbon substrate were installed to take advantage of the anticipated higher groundwater temperatures and provide abiotic degradation in the event of temperature excursions beyond those at which subsurface biological activity shuts down. The system was installed in December of 2017 and run for approximately 180 days. Adjustments to the thermal model to account for winter conditions and the use of a quench line to protect nearby utilities will be discussed. Groundwater temperature and chemistry data available from post shutdown monitoring will be discussed and presented to evaluate modeling efforts and system effectiveness.
Jason R. House, CG, PG
Woodard & Curran Inc., Portland, ME
Jason House is a Senior Hydrogeologist with experience focused on hazardous waste site investigations and new water supply site investigations utilizing both invasive and non-invasive techniques. His expertise includes all aspects of design, installation, testing, and sampling of groundwater monitoring and pumping wells. Additionally, he has designed, constructed, calibrated, and verified numerous groundwater flow and contaminant transport models that were subsequently employed in hazardous waste investigations and remediation efforts. House is a Certified Geologist in the state of Maine, a Professional Geoscientist in Texas, a Professional Geologist in Pennsylvania, and a Registered Professional Geologist in Georgia.
Dan Bryant, Ph.D., PG
Woodard & Curran, East Windsor, NJ
Dan Bryant currently leads the In-Situ Remediation Practice at Woodard & Curran. Dan has a PhD in geochemistry from Columbia University, Bachelor's and Masters degrees in geology from the University of Florida, and over 20 years of experience in site investigation and remediation.
R. Duff Collins, PG, LSP
Woodard & Curran, Dedham, MA
Duff Collins is a senior vice president of Woodard & Curran. He has more than 30 years of environmental consulting experience managing and conducting field investigations, feasibility studies, and remediation activities at hazardous waste sites for clients in the private and public sectors. He has been an active member of the MassDEP BWSC External Audit Workgroup since its inception and was extensively involved in the evaluation and documentation of the standard of practice for licensed site professionals.
John Sammon, PG, LSRP
Environmental Remediation, Woodard & Curran, East Windsor, NJ
John Sammon is a professional geologist and project manager in the Environmental Remediation Services business unit. He has over 30 years of experience investigating, remediating, and managing hazardous waste sites.
Ralph Simon, PG
Environmental Remediation, Woodard & Curran, East Windsor, NJ
Ralph Simon is a project geologist in the Environmental Remediation Services business Unit. He is a professional geologist with extensive experience in site investigation, environmental data management, data visualization, and modeling.