The Callahan Mine Superfund Site is the location of a 150-acre former zinc/copper open-pit mine adjacent to a residential neighborhood. Charter executed remediation of OU1 to address mine contamination (lead, arsenic, and PCBs) present in the residential-use area. Lead, arsenic, and PCBs were discovered to exceed acceptable levels for human contact and long-term exposure. The mine ore pad was the source of significant groundwater contamination.

Project highlights

  • On-site treatment with EnviroBlend® of 3,000 tons of TCLP-failed lead-mine waste prior to off-site disposal
  • Excavate and relocate metal-impacted soils from residential properties; remove 5,000 cubic yards (cu. yds.) of lead and arsenic-contaminated soil
  • Excavate, stockpile, characterize, and dispose of PCB contamination; the PCB-impacted soils totaled 15,000 tons
  • Total of 65,000 tons of contaminated soil excavated and staged
  • 22,000 cu. yds. of ore material relocated and installed as a multi-layer soil and geotextile cap to cover <10ppm PCBs
  • Site improvements to minimize discharge runoff

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