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Environmental and Geotechnical Construction Services

Real Estate

Industrial Complex Remediation & Redevelopment - Southwest

  • Multi-year remedial activities at this 2,200-acre industrial complex
  • Removal of 3.9M CY of waste soil, sediment and sludge
  • Construction of a 53-acre CAMU
  • Installation of a steel sheet pile retaining system up to 50 feet deep
  • Redevelopment-residential, parks and recreation

ENTACT performed multi-year remedial activities at this 2,200 acre industrial complex in preparation for mixed use redevelopment. Major scope items included the systematic blending, drying, solidification and removal of 3M+ cubic yards of waste soil, sediment and sludge; phased construction of an on-site 53-acre CAMU; concurrent placement of the amended on-site waste materials within the CAMU; design and installation of a steel sheet pile retaining system to enable excavation of pyrophoric wastes, blended VOC’s and PCBs up to 50 feet deep (Level B);  installation of a RCRA Subtitle C geosynthetic/soil cover system over the CAMU; and installation of all associated storm water management features. Total material handling over the course of the project involved over 4.7M cubic yards. Due to the excessively high moisture contents of the materials to be excavated from the 16 process ponds (<20% solids), 55 dry ponds, slit trench waste (VOC’s, PCB’s, metals, assorted debris), and other site excavations, ENTACT conducted months of treatability evaluations to reduce the moisture levels to a target of 80% solids. This process involved extensive geotechnical evaluations, mixing, free-draining, dewatering, and reagent evaluations of dozens of source materials.