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Webinar | Advances in In-Situ Treatment Technologies for 1,4-Dioxane Remediation

11-08-2023 @ 12:30 pm - 1:30 pm EST


Join us on November 8, 2023 for a technical webinar regarding Advances in In Situ Treatment Technologies for 1,4-Dioxane Remediation.

Presentation Description

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/Lessons Learned

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.

To Join The Webinar

Click here to join the meeting

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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