DERR-2024-011672

PUBLIC NOTICE of COMPLETION
Five-Year Review for the
Midvale Slag Superfund Site
Salt Lake County, Utah

Summary: Fifth Five-Year Review Completed

The Utah Department of Environmental Quality, Division of Environmental Response and Remediation
(UDEQ/DERR), and the U.S. Environmental Protection Agency (EPA), Region 8, have completed the fifth Five-Year
Review for the Midvale Slag Superfund Site (Site). Five-Year Reviews are required by the Comprehensive
Environmental Response, Compensation and Liability Act (CERCLA) when hazardous substances remain on site
above levels that permit unrestricted use and unlimited exposure. Five-Year Reviews are conducted to evaluate
the site remedy and to determine whether site conditions remain protective of human health and the
environment.
Report Summary and Protectiveness Statement:
This review provides the assessment of cleanup remedies at Operable Units (OU) 1 and 2. OU1 encompasses the
portion of the Site north of the former slag piles and smelter complex area and includes the Winchester Estates
residential area. OU2 encompasses the former slag piles and smelter complex area. The review concludes the
remedies at OU1 and OU2 are functioning as intended however additional actions are necessary to ensure long-
term protectiveness.
On January 17, 2024, the EPA issued “Updated Residential Soil Lead Guidance for CERCLA sites and Resource
Conservation and Recovery Act (RCRA) Corrective Action Facilities” that lowered recommended regional screening
level (RSL) for lead-contaminated soil at residential areas. The EPA and UDEQ/DERR will evaluate how this change
may impact the cleanup that was conducted at the Site and determine if additional investigation and/or cleanup is
needed. The EPA and UDEQ/DERR will share information on planned activities and results as they become
available.
A protectiveness determination of the remedy at the Midvale Slag site cannot be made at this time and is deferred
until further information is obtained. Additional response actions may be necessary for the remedy to remain
protective. It is expected that determination of the protectiveness status at the Site could take approximately 36
months to complete.
This Five-Year Review Report was signed April 8, 2024 and the next Five-Year Review is required five years from the
completion date. This review is available electronically at the UDEQ/DERR website at
http://www.environmentalresponse.utah.gov Or visit the EPA website under ‘Key Documents’ at:
https://www.epa.gov/superfund/Midvale-Slag
A copy of the review is also available at the UDEQ/DERR Offices located on the 1st Floor, at 195 North 1950 West,
Salt Lake City, Utah, 84114. Please call for an appointment to review records at [phone], Monday through
Friday, from 8:30 A.M. to 4:30 P.M. For information regarding the Midvale Slag Superfund Site Five-Year Review
please contact:
Tony Howes Josie Nusz
UDEQ/DERR Project Manager EPA Remedial Project Manager
Phone: [phone] Phone: [phone]
Email: [e-mail] Email: [e-mail]