Eastern Michaud Flats Contamination | Region 10 | US EPA

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Eastern Michaud Flats Contamination

The Eastern Michaud Flats Superfund Site covers approximately 2,530 acres northwest of Pocatello, Idaho. It includes two adjacent phosphate ore processing facilities. The former FMC Corporation operated a facility from the early 1940’s until December 2001. The J.R. Simplot Company Don Plant is still an active facility. EPA issued a Record of Decision (ROD) for the site in 1998. A Supplemental Remedial Investigation and Feasibility Study (RI/FS) was issued in 2010 for the FMC portion of the site, while groundwater remediation at the Simplot site is ongoing.

Site Update

The FMC Corporation will begin cleanup work at their former phosphorus processing facility under a Unilateral Administrative Order from EPA. EPA’s Order requires FMC to design, implement and pay for the actions specified in the September 2012 Interim Record of Decision Amendment under oversight by EPA and the Shoshone-Bannock Tribes. Requirements include:
  • Develop detailed technical plans and specifications for the cleanup actions
  • Construct caps over contaminated soil
  • Treat groundwater to prevent contamination from moving toward the Portneuf River
Technical Documents

Key Superfund Documents:

Other Superfund Documents:

Site Information
Site Progress Profile
Site Summary (NPL PAD)
RCRA Site Summary
Pond 16 Removal Action
Decision Documents
Technical Documents
Fact Sheets
Photo Gallery
Site Map
Information Repository Locations
Freedom of Information Act (FOIA) Requests

Contact Us:

Project Managers:

Simplot Area and Off-Plant Areas
Jannine Jennings (jennings.jannine@epa.gov)
206-553-2724 or 800-424-4372

FMC
Jonathan Williams (williams.jonathan@epa.gov)
206-553-1369, or 800-424-4372 ext 1369

Community Involvement Coordinator:

Kay Morrison (morrison.kay@epa.gov)
206-553-8321, 800-424-4372 ext 8321

Cleanup Timeline
2011
Simplot OU- GW Extraction System completion (August);GW extraction and monitoring (ongoing);Completion of lower gypstack lining (Summer);Start of upper west compartment gypstack lining (Summer)
FMC OU -GW Monitoring Report (Spring); RCRA Post Closure Plan Modification (Fall); UAO RCRA Ponds (ongoing); Proposed Plan and Public Meetings (Fall);
Offplant OU -Vegetation monitoring (Summer/Fall)

Show details for 20102010
Show details for 2009 2009
Show details for 2008 2008
Hide details for 1990 - 20071990 - 2007
2007 - May, Supplemental RI Work Plan Approved
Summer/Fall Supplemental RI field work for FMC Unit completed
2006 - December, Unilateral Order under CERCLA to FMC for Pond 16 S removal action.
2005 - Supplemental Remedial Investigation (SRI) Update Memorandum for FMC Unit (included all Site data that either was not available during the original RI/FS or may have been excluded because the facility was still operating)
2003 - Superfund Administrative Order on Consent with FMC for Supplemental Remedial Investigation/Feasibility Study of FMC Facility Unit
2002 - Superfund Consent Decree with Simplot for remedial actions at the Don Plant Unit
2001 - December, FMC closes phosphorus production facility
1998 - Superfund Record of Decision (ROD) for all 3 operable units of the site RCRA Consent Decree with FMC for Hazardous Waste/Regulated Activities
1991 - Superfund Administrative Order on Consent requiring a Remedial Investigation/Feasibilty Study (RI/FS)
1990 - Eastern Michaud Flats placed on the Superfund National Priorities List
FMC Supplemental Remedial Investigation and Feasibility Study (RI/FS): Simplot Documents: Off-site Documents RCRA Cleanup Actions: Other Documents: Fact Sheets and Outreach

Community Involvement Fact Sheets Public Meetings Southeast Idaho Update Newsletter
Information Repository Locations
Hard copy documents and information are available at the following locations during regular business hours:

    American Falls Library
    308 Roosevelt Street
    American Falls, ID 83211
    (208) 226-2335

    Idaho State University Library
    Government Documents
    850 South 9th Avenue
    Pocatello, Idaho 83209
    (208) 282-3152


    Shoshone-Bannock Library
    Tribal Business Center
    Pima Drive and Bannock Avenue
    Fort Hall, Idaho 83203
    (208) 478-3882


    EPA Region 10 Superfund Records Center
    1200 Sixth Avenue, Suite 900, ECL-076 (7th Floor)
    Seattle, WA 98101
    (206) 553-4494
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