Superfund Information Systems: Site Profile

Superfund Site:

MIDVALE SLAG
MIDVALE, UT

Cleanup Progress

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Cleaning up Superfund sites is a complex, multi-phase process. Learn more:

Site Milestones

Milestone Date(s)
Initial Assessment Completed 12/01/1984
Proposed to the National Priorities List 06/10/1986
Finalized on the National Priorities List 02/11/1991
Remedial Investigation Started 08/07/1989
Remedy Selected 04/28/1995
Final Remedy Selected 10/29/2002
Remedial Action Started 09/07/1995
Final Remedial Action Started 04/18/2011
Construction Completed 09/29/2011
Deleted from National Priorities List 04/08/2015
Most Recent Five-Year Review 04/08/2019
Site Ready for Reuse and Redevelopment 09/29/2011

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Cleanup Schedule by Operable Unit

During cleanup, a site can be divided into a number of distinct areas depending on its complexity. These areas, called operable units (OUs), may address geographic areas, specific problems, or areas where a specific action is required. Examples of typical operable units include construction of a groundwater pump and treatment system or construction of a cap over a landfill.

Milestone OU Start Date Completion Date OU ID
Consent Decree (EPA Performed) OU 00 - SITEWIDE 11/13/1990 00
Consent Decree (EPA Performed) OU 00 - SITEWIDE 01/11/2000 00
Removal (EPA Performed) OU 00 - SITEWIDE 03/30/1990 12/14/1990 00
Removal (EPA Performed) OU 00 - SITEWIDE 12/12/1990 06/20/1991 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 10/20/2003 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 12/30/2008 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 04/11/2014 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 04/08/2019 00
Removal (EPA Performed) OU 01 - NORTHERN ZONE 10/02/2001 10/19/2001 01
Combined Remedial Investigation/Feasibility Study (State Performed) OU 01 - NORTHERN ZONE 08/07/1989 04/28/1995 01
Record of Decision (State Performed) OU 01 - NORTHERN ZONE 04/28/1995 01
Explanation of Significant Differences (EPA Performed) OU 01 - NORTHERN ZONE 02/10/2006 01
Remedial Design (State Performed) OU 01 - NORTHERN ZONE 03/27/1995 09/07/1995 01
Remedial Design (State Performed) OU 01 - NORTHERN ZONE 12/20/1996 07/06/1998 01
Remedial Action (State Performed) OU 01 - NORTHERN ZONE 09/07/1995 04/03/1996 01
Remedial Action (State Performed) OU 01 - NORTHERN ZONE 07/29/1998 03/30/1999 01
Consent Decree (EPA Performed) OU 02 - SOUTHERN ZONE 11/16/2004 02
Removal (EPA Performed) OU 02 - SOUTHERN ZONE 05/16/1995 05/24/1995 02
Removal (EPA Performed) OU 02 - SOUTHERN ZONE 10/03/1996 11/08/1996 02
Removal (EPA Performed) OU 02 - SOUTHERN ZONE 10/09/1996 06/30/1997 02
Removal (EPA Performed) OU 02 - SOUTHERN ZONE 10/31/1996 04/17/1997 02
Removal (EPA Performed) OU 02 - SOUTHERN ZONE 03/01/1998 03/31/1999* 02
Feasibility Study (EPA Performed) OU 02 - SOUTHERN ZONE 03/07/2000* 04/29/2002 02
Feasibility Study (EPA Performed) OU 02 - SOUTHERN ZONE 10/16/2000 05/06/2002 02
Combined Remedial Investigation/Feasibility Study (EPA Performed) OU 02 - SOUTHERN ZONE 09/05/1997 10/29/2002 02
Proposed Plan (EPA Performed) OU 02 - SOUTHERN ZONE 05/20/2002 05/20/2002 02
Record of Decision (EPA Performed) OU 02 - SOUTHERN ZONE 10/29/2002 02
Explanation of Significant Differences (EPA Performed) OU 02 - SOUTHERN ZONE 10/28/2013 02
Remedial Design (EPA Performed) OU 02 - SOUTHERN ZONE 11/14/1995 03/31/1999* 02
Remedial Design (PRP Performed, EPA Oversight) OU 02 - SOUTHERN ZONE 05/13/2003 09/29/2004 02
Remedial Design (EPA Performed) OU 02 - SOUTHERN ZONE 06/23/2003 03/24/2008 02
Remedial Design (EPA Performed) OU 02 - SOUTHERN ZONE 07/24/2003 09/30/2004 02
Remedial Design (EPA Performed) OU 02 - SOUTHERN ZONE 11/21/2007 09/29/2009 02
Remedial Design (EPA Performed) OU 02 - SOUTHERN ZONE 03/31/2009 07/09/2010 02
Remedial Design (EPA Performed) OU 02 - SOUTHERN ZONE 09/09/2010 11/22/2010 02
Remedial Action (PRP Performed, EPA Oversight) OU 02 - SOUTHERN ZONE 09/29/2004 08/13/2007 02
Remedial Action (EPA Performed) OU 02 - SOUTHERN ZONE 05/08/2008 09/17/2009 02
Remedial Action (EPA Performed) OU 02 - SOUTHERN ZONE 09/22/2008 08/07/2009 02
Remedial Action (EPA Performed) OU 02 - SOUTHERN ZONE 03/31/2009 12/14/2009 02
Remedial Action (EPA Performed) OU 02 - SOUTHERN ZONE 09/09/2010 09/29/2011 02
Remedial Action (EPA Performed) OU 02 - SOUTHERN ZONE 04/18/2011 09/29/2011 02
Operation and Maintenance (PRP Performed, EPA Oversight) OU 02 - SOUTHERN ZONE 08/13/2007 02
Operation and Maintenance (State Oversight) OU 02 - SOUTHERN ZONE 08/10/2009 06/30/2015 02

*NOTE: This date may not reflect the actual start or actual completion of the milestone. Either the lead for this activity changed, the project was phased, or the project did not fit the normal definitions of activities tracked in this table.

NOTE: Dates and estimated dates will not display for all milestones. Estimated dates only display for milestones planned within the next three fiscal years. Estimated dates and start dates will not display for the following enforcement milestones: Administrative Order of Consent, Consent Decree and Unilateral Administrative Order. Start dates will not display for the following document milestones: Five-Year Review, Record of Decision, Record of Decision Amendment, Explanation of Significant Differences and Partial NPL Deletion.

DISCLAIMER: The data on this page are derived from the Superfund Enterprise Management System and are solely for informational purposes. The data cannot be relied upon to create any substantive or procedural rights or requirements enforceable by any party in litigation with any member of the public, states, tribes, the United States or any federal agency. EPA reserves the right to change these data at any time without public notice.

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