Topic: Groundwater Remediation in the Denver Metro – Lessons Learned Working in the Denver Formation
Speakers: James E. Studer, M.S., P.E., Principal Consultant, InfraSUR LLC
Time: Tuesday, March 9, 2021, 11:45am-1pm
Registration: Webinar details and links below
CEMS has received one (1) general CLE credit for this presentation
The Denver Formation forms the upper portion of the Denver Aquifer of the Denver Basin Aquifer System. The Denver Aquifer is subject to pollution from anthropogenic activities and groundwater contamination may trigger groundwater remediation to address risks to human health and ecological receptors (e.g., see Colorado Water Quality Control Act).
The Denver Formation is generally described as fluvial deposits of fine-grained mudstone and siltstone encasing meandering sandstone-filled channels. Progress in treating groundwater contamination in the Denver Formation, especially using in-situ approaches, can be hampered by challenges presented by the formation-groundwater physical and biogeochemical characteristics as well as contaminant character. A case study is presented to demonstrate that challenges can be overcome with careful strategic planning including detailed testing, remedial technology selection, and iterative approach.
The phased full-scale remedial action against a tetrachloroethylene (PCE) plume using an abiotic in-situ chemical reduction technology (BiRD) achieved significant reduction of detected PCE concentrations to 360 ft downgradient of the source. All elective concentration-based cleanup levels (e.g., 5 ug/L for PCE) were achieved between source area and principal performance well, down gradient approximately 180 feet. This impressive performance was realized within 12 months of creating an in-situ reactive zone. Only four injection boreholes with straddle packer assembly were required in creating the reactive zone. This performance has been sustained for over three years; performance monitoring continues. Lessons learned will be presented.
James E. Studer, M.S., P.E., Member ASCE, AGWSE
Jim Studer is an engineer, scientist, and business leader based in Albuquerque, New Mexico. His passion is working with others to solve societal problems related to pollution and waste streams that can impact public and ecological health and efficient resource utilization. He also enjoys contributing to infrastructure green field and brownfield projects and has led, or supported, the development of numerous characterization and remediation technologies.
Jim has 35 years of professional consulting experience and has led the small international consulting and technology development practice InfraSUR LLC for 20 years. He started InfraSUR to provide specialist services to regional to international consulting firms practicing in the areas of subsurface characterization and environmental remediation and waste management. The bulk of InfraSUR projects relate to groundwater remediation at private sector and government installations across the US and Canada but unique project engagements arise frequently.
Jim is a native Coloradan. He earned B.S./M.S. degrees, with honors, in Geological Engineering at the University of Missouri-Rolla (UMR), renamed Missouri University of Science and Technology in 2008. He is a registered civil engineer in the State of Kansas. He is a published author, speaker, and contributes to Interstate Technology and Regulatory Council (ISCO, Fractured Rock, In situ Remediation Optimization, Soil Background for Risk Assessment).
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