ENTACT performed remediation activities at a Gulf Coast refinery as part of a Resource Conservation and Recovery Act (RCRA) Corrective Action to address solidified F037 waste and oily sediments in preparation for constructing a new ethane cracker unit. Scope of work completed by ENTACT:

• Demolished and removed at-grade and below-grade structures
• Removed existing cover materials for segregation, stockpiling, and/or reuse as road or laydown area material or backfill at other areas of the refinery
• Dewatered existing water and managed water within excavation areas
• In-situ stabilization of 615,000 cubic yards of solidified F037 waste and oily sediments to meet Remedy Standard A (residential) levels
• Excavated stabilized materials to specified elevations or leaving them in place, as appropriate
• Installed erosion control measures and final site restoration

Following the sediment remediation, ENTACT was requested to relocate onsite landfill material to prepare the area for long-term infrastructure improvements.

• Excavated 55,000 cubic yards of landfill material to a depth of 20 feet and relocated it to the existing landfill
• Managed groundwater using sumps, discharging into the facility’s wastewater treatment stream
• Backfilled and compacted the area in lifts using adjacent site soils, importing 20,000 cubic yards of clay to construct an impermeable clay cap

This comprehensive remediation ensured compliance with regulatory standards and facilitated the refinery’s expansion plans.