Revised On: March 29, 2024 - 12:13 p.m.

Location: 

• Multiple sites in Superior, Arizona
  
  

Acceptance Into Voluntary Remediation Program (VRP):

• Dec. 14, 2016
  
  

Contaminants of Concern (COCs):

• Metals from historic mine smelter activities
  
  

Affected Media:

• Soil
  
  

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 began June 2022 and completed in September 2022. The background study findings will be integrated with the HHRA findings to produce site-specific soil remediation levels.
• Site-Specific Soil Remediation Level Report, Property Characterization Work Plan, and Remedial Action Plan submitted in October 2023 and reviewed in February 2024.