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
