Presentation Title:
Enhanced In Situ Biochemical Remediation of Petroleum Hydrocarbon-Impacted Groundwater at a Gas Station in Pennsylvania

Topic Area: 1c. Biogeochemical Remediation Processes

Formatted Title:

Enhanced In Situ Biochemical Remediation of Petroleum Hydrocarbon-Impacted Groundwater at a Gas Station in Pennsylvania

Background/Objectives:

The remediation of petroleum hydrocarbon-impacted groundwater at a gas station in Pennsylvania showcases an innovative approach to addressing persistent contamination. The site has experienced two gasoline releases from underground storage tanks (USTs), in 2017 and 2022, each presenting unique challenges. The 2017 release was addressed through vacuum-enhanced extraction; however, residual groundwater contamination necessitated further action. A Remedial Action Plan (RAP) approved in 2019 led to the installation of a closed-loop groundwater recirculation system in 2021. The 2022 release complicated site conditions by significantly increasing contaminant concentrations and plume footprint, requiring adjustments to the remediation strategy.

Approach/Activities:

The remediation approach employs a closed-loop groundwater recirculation system combining groundwater extraction, oxygenation, and injection of bioremediation amendments, including petroleum-degrading bacteria, electron acceptors, and nutrients. This adaptive system allows real-time adjustments to dosing requirements, ensuring effective treatment of evolving site conditions. Following the second release in 2022, the system was optimized to target the expanded plume and new source area. Continuous operation of the system minimizes manual intervention and reduces logistical and cost burdens associated with frequent site mobilizations.

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E4.: Biogeochemical Remediation Processes (Posters)