The Leviathan Mine is a former underground and open-pit mine located high on the eastern slopes of California's Sierra Nevada mountains.
The Environmental Protection Agency (EPA) has designated the Leviathan Mine a Superfund site because of environmental impacts associated with historical mine operations. Two water treatment systems are operating at the site to address water quality concerns. These systems treat acid rock drainage (ARD). One water treatment system, a lime addition high-density sludge (HDS) system, operates seasonally to treat ARD seepage on the western side of the mine. The other system, a biochemical reactor, treats ARD year-round from the eastern side.
Since 2006, Trihydro’s predecessor, Alloy Group’s Engineering and Consulting Division (acquired in 2024), has managed these two mine's water treatment systems. This expanded role involves a wide range of tasks, ensuring the mine operates responsibly and meets environmental and health and safety requirements, including:
- Providing expertise, overseeing execution, and ensuring compliance with EPA requirements.
- Managing daily operations, maintenance, and monitoring of both HDS and biochemical treatment systems.
- Coordinating with government agencies and stakeholders, drafting reports, and updating project timelines.
- Conducting HSSE audits to identify and address hazards and promote safe work practices.
- Participating in discussions and planning for future water treatment, surface water quality improvements, and overall site remediation.