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Superior Soil Study Area | VRP Site


Multiple sites in Superior, AZ

Acceptance Into Voluntary Remediation Program (VRP):

December 14, 2016

Contaminants of Concern (COCs):

Metals from historic mine smelter activities

Affected Media:


What Are My Health Risks?

For Soil | There is little to no health risk unless there is contact with skin or ingestion of contaminated soil.

Site Summary:

  • Project is a town-wide smelter emissions study
  • Limited initial site characterization activities were completed in June 2018. An initial investigation report was submitted to the VRP in July 2018. The VRP and the Volunteer communicated throughout 2018 to evaluate path-forward options.
  • The Volunteer worked in close cooperation with the VRP in 2019 to develop a comprehensive Human Health Risk Assessment (HHRA) Work Plan to define the methodologies to establish risk-based criteria.
  • The VRP received a final HHRA Work Plan in March 2020 and approved the HHRA Work Plan on April 21, 2020.
  • Throughout 2020 and 2021, ADEQ and BHP worked cooperatively to complete a comprehensive HHRA. The HHRA was approved in December 2021.
  • Through 2020 and 2021, the Volunteer and the VRP continue to work cooperatively to develop a comprehensive background study work plan. The background study work plan was approved in March 2022.
  • Background sampling field work begins June 2022 and will be completed in September 2022. Once field work is completed, the background study findings will be integrated with the HHRA findings to produce site-specific soil remediation levels.