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Environmental and Geotechnical Construction Services

Oil & Gas

Former Waste Oil Recovery Facility NPL Site - Southwest

  • Remediation services at a150-acre former waste oil recovery facility site
  • Demolition of above-ground tanks, buildings, process vessels, piping, and other structures
  • Installation of a 40-foot deep, 3,300 linear foot perimeter soil-bentonite slurry wall around the sludge lagoon
  • Construction of a 30-acre RCRA Subtitle C equivalent cell
  • Excavation of 200,000 CY of impacted soils and rubble, solidification of 275,000 CY of subsurface source material and sludge

ENTACT is completing remediation services at this 150-acre site that includes a former waste oil recovery facility, numerous above ground storage tanks, two API separators, a large elevated sludge impoundment and a small cemetery. The site is bordered by the shores of an adjacent bay, a closed waste disposal site, undeveloped marsh and wetlands, and a closed city landfill. ENTACT is implementing a phased approach to allow construction concurrent with design submittals and approvals, thus reducing overall total schedule. To date, ENTACT has completed demolition of above-ground tanks, buildings, process vessels, piping, and other structures; installation of a 40-foot deep, 3,300 linear foot perimeter soil-bentonite slurry wall around the sludge lagoon; installation of a vacuum well-point dewatering system; and construction of a 30-acre RCRA Subtitle C equivalent cell. Current and on-going scope includes excavation of 200,000 cubic yards of impacted soils and rubble, solidification of 275,000 cubic yards of subsurface source material and sludge, and placement of said materials into the on-site cell. Concurrent with solidification and consolidation activities, ENTACT is backfilling the sludge pit and excavation areas with approximately 340,000 cubic yards of clean fill and importing and placing over 60,000 tons of riprap for shoreline protection along the bay.