The BAPG presents...
Come join us for an interesting project example of bioremediation of chlorinated solvents.
Speakers: Hannah Annunziata, Geochemist, ParsonsandJames W Schuetz P.G., Hydrogeologist, Parsons
A pilot test for enhanced in situ bioremediation (EISB) was carried out for a site in the Northeastern United States with chlorinated solvent impacts. Prior to the EISB pilot test, a hydrogeologic investigation was completed to further develop a conceptual site model. The site is located on a peninsula surrounded by surface water, with a complex geologic setting, including weathered bedrock and bedrock fractures.
Injection wells were installed in the overburden to the top of rock. The pilot test objectives were to analyze the following: 1) determine horizontal area of influence while protecting an adjoining surface water body from substrate daylighting, and 2) evaluate the extent of connectivity of weathered and fractured bedrock with overburden in the source area. In situ monitoring included Bluetooth-enabled transducers to monitor for substrate breakthrough in nearby wells, mechanical methods to visually identify breakthrough, and fluorescein dye tracer.
Field monitoring techniques established multiple lines of evidence of EISB influence throughout the pilot test area. Subsequent performance monitoring has identified strong evidence of full biodegradation to ethene at locations within the primary zone of influence of the injections, supported by trends in chlorinated volatile organic compounds, microbial populations, total organic carbon, and other geochemical conditions.
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