Superfund Information Systems: Site Profile

Superfund Site:

MONSANTO CHEMICAL CO. (SODA SPRINGS PLANT)
SODA SPRINGS, ID

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 01/09/1986
Proposed to the National Priorities List 05/05/1989
Finalized on the National Priorities List 08/30/1990
Remedial Investigation Started 03/19/1991
Final Remedy Selected 04/30/1997
Final Remedial Action Started 10/15/1998
Construction Completed 09/20/2000
Deleted from National Priorities List Not Yet Achieved
Most Recent Five-Year Review 09/12/2018
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 03/19/1991 00
Consent Decree (EPA Performed) OU 00 - SITEWIDE 06/28/1998 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 09/30/2003 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 09/18/2008 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 09/10/2013 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 09/12/2018 00
Combined Remedial Investigation/Feasibility Study (PRP Performed, EPA Oversight) OU 01 - REMEDIAL 03/19/1991 04/30/1997 01
Combined Remedial Investigation/Feasibility Study (PRP Performed, EPA Oversight) OU 01 - REMEDIAL 09/30/2013 01
Record of Decision (EPA Performed) OU 01 - REMEDIAL 04/30/1997 01
Remedial Design (PRP Performed, EPA Oversight) OU 01 - REMEDIAL 06/28/1998 10/15/1998 01
Remedial Action (PRP Performed, EPA Oversight) OU 01 - REMEDIAL 10/15/1998 01

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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