Superfund Information Systems: Site Profile

Superfund Site:

MILLTOWN RESERVOIR SEDIMENTS
MILLTOWN, MT

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 05/01/1982
Proposed to the National Priorities List 12/30/1982
Finalized on the National Priorities List 09/08/1983
Remedial Investigation Started 06/27/1983
Remedy Selected 04/14/1984
Final Remedy Selected 12/15/2004
Remedial Action Started 05/04/1984
Construction Completed Not Yet Achieved
Deleted from National Priorities List Not Yet Achieved
Most Recent Five-Year Review 09/29/2016
Site Ready for Reuse and Redevelopment Not Yet Achieved

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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
Administrative Order of Consent (EPA Performed) OU 00 - SITEWIDE 02/02/1990 00
Administrative Order of Consent (EPA Performed) OU 00 - SITEWIDE 01/08/1999 00
Consent Decree (EPA Performed) OU 00 - SITEWIDE 01/24/2005 00
Unilateral Administrative Order (EPA Performed) OU 00 - SITEWIDE 05/18/1999 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 09/23/2011 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 09/29/2016 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE Estimated Sep - Nov 2021 00
Combined Remedial Investigation/Feasibility Study (State Performed) OU 01 - WATER SYSTEM 06/27/1983 04/14/1984 01
Record of Decision (EPA Performed) OU 01 - WATER SYSTEM 04/14/1984 01
Record of Decision Amendment (EPA Performed) OU 01 - WATER SYSTEM 08/07/1985 01
Remedial Design (State Performed) OU 01 - WATER SYSTEM 05/04/1984 09/15/1984 01
Remedial Action (State Performed) OU 01 - WATER SYSTEM 05/04/1984 09/15/1984 01
Consent Decree (EPA Performed) OU 02 - RESERVOIR 02/08/2006 02
Remedial Investigation (State Performed) OU 02 - RESERVOIR 03/11/1985 02/02/1990* 02
Feasibility Study (State Performed) OU 02 - RESERVOIR 12/07/1987 02/02/1990* 02
Feasibility Study (PRP Performed, EPA Oversight) OU 02 - RESERVOIR 02/02/1990 12/15/2004 02
Proposed Plan (PRP Performed, EPA Oversight) OU 02 - RESERVOIR 04/15/2003 04/15/2003 02
Proposed Plan (PRP Performed, EPA Oversight) OU 02 - RESERVOIR 04/29/2004 04/29/2004 02
Record of Decision (EPA Performed) OU 02 - RESERVOIR 12/15/2004 02
Remedial Design (PRP Performed, EPA Oversight) OU 02 - RESERVOIR 07/18/2005 06/19/2009 02
Remedial Action (EPA Performed) OU 02 - RESERVOIR 02/15/2006 Estimated Mar - May 2022 02
Consent Decree (EPA Performed) OU 03 - MAINSTEM RIVER 08/21/2008 03
Removal (PRP Performed, EPA Oversight) OU 03 - MAINSTEM RIVER 06/21/1999 04/29/2004 03
Combined Remedial Investigation/Feasibility Study (PRP Performed, EPA Oversight) OU 03 - MAINSTEM RIVER 07/07/1995 04/29/2004 03
Record of Decision (EPA Performed) OU 03 - MAINSTEM RIVER 04/29/2004 03
Explanation of Significant Differences (EPA Performed) OU 03 - MAINSTEM RIVER 06/12/2015 03
Remedial Design (EPA Performed) OU 03 - MAINSTEM RIVER 09/10/2008 08/02/2011 03
Remedial Design (State Performed) OU 03 - MAINSTEM RIVER 09/10/2008 10/03/2012 03
Remedial Design (EPA Performed) OU 03 - MAINSTEM RIVER 06/10/2009 10/05/2010 03
Remedial Design (State Performed) OU 03 - MAINSTEM RIVER 08/14/2009 11/27/2012 03
Remedial Design (EPA Performed) OU 03 - MAINSTEM RIVER 10/26/2011 03/03/2016 03
Remedial Design (EPA Performed) OU 03 - MAINSTEM RIVER 10/26/2011 04/30/2014 03
Remedial Design (EPA Performed) OU 03 - MAINSTEM RIVER 10/26/2011 07/16/2018 03
Remedial Design (EPA Performed) OU 03 - MAINSTEM RIVER 10/26/2011 Estimated Jun - Aug 2021 03
Remedial Design (EPA Performed) OU 03 - MAINSTEM RIVER 05/12/2015 Estimated Dec 2020 - Feb 2021 03
Remedial Design (EPA Performed) OU 03 - MAINSTEM RIVER 05/12/2015 Estimated Sep - Nov 2022 03
Remedial Design (State Performed) OU 03 - MAINSTEM RIVER 09/28/2015 03
Remedial Design (EPA Performed) OU 03 - MAINSTEM RIVER 08/31/2017 03
Remedial Action (EPA Performed) OU 03 - MAINSTEM RIVER 10/05/2010 12/31/2013 03
Remedial Action (EPA Performed) OU 03 - MAINSTEM RIVER 08/02/2011 12/31/2013 03
Remedial Action (State Performed) OU 03 - MAINSTEM RIVER 10/03/2012 09/24/2018 03
Remedial Action (State Performed) OU 03 - MAINSTEM RIVER 11/27/2012 09/28/2017 03
Remedial Action (EPA Performed) OU 03 - MAINSTEM RIVER 04/30/2014 09/28/2017 03
Remedial Action (EPA Performed) OU 03 - MAINSTEM RIVER 06/29/2015 09/28/2017 03
Remedial Action (EPA Performed) OU 03 - MAINSTEM RIVER 10/18/2018 Estimated Nov 2020 - Jan 2021 03
Remedial Action OU 03 - MAINSTEM RIVER Estimated Jun - Aug 2021 Estimated Sep - Nov 2022 03
Remedial Action OU 03 - MAINSTEM RIVER Estimated Jun - Aug 2021 03
Remedial Action OU 03 - MAINSTEM RIVER Estimated Sep - Nov 2022 03

*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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