Join us on November 8, 2023 for a technical webinar regarding Advances in In Situ Treatment Technologies for 1,4-Dioxane Remediation.
1,4-Dioxane is a probable human carcinogen, an emerging contaminant at many military and industrial contaminated sites, and currently has limited in‑situ remedial options. At a former facility where manufacturing components were cleaned, shallow groundwater was heavily impacted by 1,4-dioxane from wastewater discharges. Concentrations have been reduced through implementation of a phytoremediation pilot study and source mass removal activities; however, remedial expansion is warranted to increase the rates of contaminant reduction and mass flux reduction at the property line.
To support future remedial decisions for the Site, in-situ remedial options were evaluated, natural attenuation processes were examined, and a data gap investigation was performed. It was determined that the naturally occurring microbial population, likely Pseudonocardia dioxanivorans BERK-1, in the Site aquifer is capable of degrading 1,4-dioxane in situ if sufficient oxygen is present (where dissolved oxygen [DO] is greater than approximately 1 milligram per liter [mg/L]).
Results of the data gap investigation confirmed the relationship between aerobic geochemical conditions and lower 1,4-dioxane concentrations and indicates that introduction of atmospheric air to the subsurface will increase DO and accelerate the in-situ destruction of 1,4-dioxane. Pilot study expansions in 2023 have included installation of a novel engineered aeration trench to biostimulate aerobic metabolic biodegradation at the source area paired with a downgradient phytoremediation system.
Tracy Ovbey, MBA
Tracy is a project manager with more than 21 years of experience in the areas of environmental studies, remediation, and emerging contaminant investigation.
Kristi Diller, PG
Kristi is a geologist specializing in in-situ groundwater remediation and emerging contaminants such as 1,4-dioxane. She has more than 17 years of experience in environmental investigations and remediation for Federal and industrial clients.
Or call in (audio only): +1 951-465-7634
Phone Conference ID: 265 061 857#
Please visit the Parsons YouTube channel where video recordings of our previous technical webinars are available for viewing.
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