Trihydro conducted an environmental site assessment and identified chlorinated solvent contamination in the soil and groundwater at a former solvent recycling facility. To address this issue, Trihydro is implementing a comprehensive cleanup plan that utilizes a combination of advanced techniques like dual-phase extraction, bioremediation, and phytoremediation.

Trihydro is performing environmental remediation at a former solvent recycling facility in  Central Kentucky to address legacy contamination impacting soil and groundwater at the site.  We are also assisting with site closure activities, including document preparation and regulatory negotiations.

Initially, Trihydro focused on mitigating surface water infiltration through regrading and restoration efforts. This minimized the potential for rainwater to transport existing contamination.

Trihydro also designed, installed, and currently operates remediation systems to control groundwater discharge and address deeper contamination. These systems utilize pump-and-treat methods with extraction trenches and high-vacuum technology. Trihydro managed the entire process, including system design, subcontractor selection, project oversight, and safety during construction at this active facility.

Trihydro is transitioning the site towards more sustainable, long-term solutions. We are operating and maintaining the current systems while evaluating and implementing passive technologies like in-situ bioremediation (ISB) and phytoremediation. Additionally, risk assessments were conducted to guide the overall remedial strategy.

A Corrective Measures Study/Corrective Measures Implementation (CMS/CMI) Report was submitted to the Kentucky Department of Environmental Protection (KYDEP) and USEPA Region IV in 2013. This report detailed the site's remediation activities, conceptual site model, exposure assessment, risk assessment, and proposed corrective measures.

Following CMS/CMI approval, Trihydro's data indicated the remediation systems were nearing their full effectiveness. This finding was presented to KYDEP, who agreed to allow a transition towards passive remedies like ISB, phytoremediation, and monitored natural attenuation (MNA). These technologies were initially presented in the CMS/CMI and further evaluated after KYDEP's approval.

ISB implementation began with a pilot test in 2017, followed by a full-scale rollout in 2019, 2020, and 2022. ISB, combined with previous remedial processes, has achieved up to 99% reduction of chlorinated compounds in targeted areas. ISB operations are authorized by USEPA Region IV under an Underground Injection Control (UIC) permit.

The phytoremediation system involved planting hybrid poplar trees (675 in 2019 and 300 in 2020). Once established, these trees will absorb groundwater at a rate comparable to the extraction trenches, allowing for their eventual decommissioning.

Long-term MNA monitoring indicates that natural biodegradation is active at the site. The combined application of ISB, phytoremediation, and MNA will provide sustainable, long-term solutions once the current extraction systems are decommissioned.

Want to keep reading?