East Mission Flats Repository

East Mission Flats Repository

 

The East Mission Flats Repository is west of Cataldo, Idaho, across Interstate 90, away from the Old Mission. The repository securely contains contaminated soils from property cleanups in the Lower Basin. It helps reduce people’s exposure to harmful metals like lead and arsenic. Property owners who do their own work under the Basin Institutional Controls Program can also dispose of soils at East Mission Flats.

In response to public input, the repository height has been reduced from 62 feet to 34 feet. East Mission Flats is not easily visible from the Old Mission. Only soils contaminated with mine waste are accepted at the repository. Municipal wastes and residential garbage are not accepted.

Superfund cleanup is being conducted in the Coeur d’Alene Basin to address unacceptable health risks to people and the environment. Soils from cleanups of residential and commercial properties contain metals, like lead and arsenic, that can harm people. These soils need a place to go to be safely contained. Waste repositories are carefully chosen and engineered to securely contain contaminated soils through time, to reduce impacts to people and the environment. Repositories will be managed long after they are closed to be sure the contaminants remain contained and secure.

Fact Sheets and Public Involvement

• Brochure: Water Sampling at East Mission Flats Repository (PDF) (4 pp, 500K) – May 2013. Learn about the monitoring program, sampling results, and protective features of the repository. Download the 11×17 foldable version (PDF) (2 pp, 500K)
• Response to Questions – October 2009 Edition (PDF) (10 pp, 87K) – October 2009
• East Mission Flats Repository to Proceed – September 28, 2009
• Response to Questions – September 2009 Edition (PDF) (9 pp, 82K) – September 2009
• Summer Construction Projects (PDF) (4 pp, 98K) – June 2009
• Responses to Public Suggestions on EMF 60% Design Report (PDF) (14 pp, 90K)
• Responses to Public Suggestions on EMF 30% Design Report (PDF) (14 pp, 100K)
• Letter to Citizens (PDF) (3 pp, 44K) – November 2007
• Frequently Asked Questions
• Questions and Answers Postcard (PDF) (1 pp, 52K) – September 2007
• An Update on East Mission Flats (PDF) (4 pp, 80K) – June 2007

Office of Inspector General Investigation Documents

• Final East Mission Flats Repository Enhanced Monitoring Plan (PDF) (17 pp, 1MB) – November 2009
  • Cover Memo for Final Enhanced Monitoring Plan (PDF) (2 pp, 303K) – November 2009
• Summary of East Mission Flats Enhanced Monitoring Plan (PDF) (2 pp, 29K) – October 2009
• OIG concerns addressed, repository to proceed – September 2009
• Final Response from Office of Inspector General (PDF) (1 pp, 27K) – August 12, 2009
• Letter from DEQ to EPA (PDF) (3 pp, 56K) – August 12, 2009
• Final Response to OIG Summarizing 8/10/09 Conference Call (PDF) (1 pp, 30K) – August 11, 2009
• OIG Email to EPA R10 with Additional Questions (PDF) (3 pp, 24K) – August 6, 2009
• Memo from EPA R10 to OIG (PDF) (2 pp, 42K) – July 23, 2009
• Technical Verification in Reponse to OIG’s Recommendation (PDF) (6 pp, 69K) – July 21, 2009
• Letter to the Editor from DEQ and EPA (PDF) (1 pp, 15K) – July 2009
• EPA R10’s Response to OIG Final Report (PDF) (2 pp, 145K) – June 17, 2009
• IG Report: Contaminated Soil Waste Repository at East Mission Flats, Idaho (PDF) (32 pp, 436K) – June 8, 2009
• Letter Transmitting Wilkin Memo to OIG (PDF) (6 pp, 172K) – May 15, 2009
• Supplemental Information for OIG (PDF) (3 pp, 43K) – May 15, 2009
• 4/17/09 letter to OIG in response to draft report (PDF) (4 pp, 147K) – April 17, 2009

Technical Documents

• Optimization Review Report: East Mission Flats and Big Creek Repositories (PDF) (59 pp, 5MB) – October 2016
• 2015 Annual Water Quality Report (PDF) (54 pp, 10.5MB)
• October 2015 Semi-Annual and Resampling Water Monitoring Events (PDF) (36 pp, 8.7MB) – This water quality report provides sampling results from October 2015 and December 2015 at the East Mission Flats Repository. Monitoring will continue during 2016 and beyond to confirm that the repository is protective of human health and the environment. Ongoing evaluations are being performed to interpret recent monitoring results and determine if any improvements to the monitoring program are required.
• April 2015 Semi-Annual and Resampling Water Monitoring Events (PDF) (38 pp)
• 2014 Annual Water Quality Report (PDF) (47 pp, 4.8MB)
• First quarter 2015 Water Monitoring (PDF) (32 pp, 7MB)
• Fourth Quarter 2014 Groundwater Monitoring (PDF) (35 pp, 10MB) – January 2015
• Third Quarter 2014 Groundwater Monitoring (PDF) (32 pp, 5.1MB) – October 2014
• 2013 Annual Water Quality Report (PDF) (58 pp, 5.3MB) – September 2014
• Second Quarter 2014 Groundwater Monitoring (PDF) (33 pp, 2.7MB) – July 2014
• First Quarter 2014 Groundwater Monitoring (PDF) (34 pp, 6.5MB) – April 2014
• Floodwater Monitoring at the East Mission Flats Repository (PDF) (51 pp, 6.7MB) – March 2014. This document contains the results of the March 2014 floodwater monitoring at the East Mission Flats Repository.  The results conclusively show that floodwater lead concentrations decreased as floodwater left the area surrounding the repository.  The results for cadmium and zinc are inconclusive.  Based on the lack of correlation between floodwater metals concentrations and the migration of dissolved metals away from the repository, the floodwater monitoring will be discontinued at the East Mission Flats Repository.  Due to the extensive contamination in the area, changes in floodwater metals concentrations can be influenced by many sources unrelated to the repository making the monitoring ineffective for the detection monitoring program required at the repository.  However, all monitoring, including groundwater and repository pore water monitoring that were included as part of the Enhanced Monitoring Plan accepted by the EPA Office of Inspector General will be continued.
• First Groundwater Sampling Event of 2012 at East Mission Flats Repository (PDF) (11 pp, 391K) – March 20, 2012
• East Mission Flats Repository 2012 Annual Water Monitoring Report (PDF) (92 pp, 5.9MB) – February 25, 2014
• Groundwater monitoring results from December 2007 through October 2012 (PDF) (31 pp, 729K) – More analysis will be made available in a roll-up of 2012 quarterly monitoring data when the 2012 annual monitoring report is finalized.
  • Flood water sampling results for 2012 (PDF) (31 pp, 729K)
  • Flood water sampling results for 2011 (PDF) (30 pp, 722K)
  • Flood water sampling results for 2008 (PDF) (6 pp, 62K)
• Monitoring results (PDF) (2 pp, 90K) available for dissolved metals in groundwater at the East Mission Flats Repository, for Dec. 2007 – Nov. 2009. In response to the EPA Office of Inspector General’s recommendation, the Idaho Dept. of Environmental Quality and EPA committed to an Enhanced Monitoring Plan (EMP) (PDF) (17 pp, 874K) for the repository. After field equipment is installed in Summer 2010, the agencies will collect and post the other data we committed to under the EMP. This will include tragmnsducer and manual water levels, USGS Cataldo gauging station data, and water quality data. View EMP summary (PDF)(2 pp, 29K).
• East Mission Flats Monitoring Activities Description (PDF) (3 pp, 276K) – January 2012
• East Mission Flats Quarterly Groundwater Monitoring Results (PDF) (2 pp, 90K) – December 2007 through November 2009
• East Mission Flats 90% Design Executive Summary (PDF) (20 pp, 332K) – July 2009

Meeting Presentations and Handouts

• ICP Soils Handout – EMF Open House (PDF) (1 pp, 69K) – July 31, 2008
• Basin Overview, Citizens Coordinating Council (PDF) (26 pp, 3.9MB)- October 16, 2007
• Welcome to the East Mission Flats Site Tour (PDF) (2 pp, 68K) – June 22, 2007
• Repository Open House Handout – July 20, 2005 (PDF) (5 pp, 457K) 
  
• Repository Open House Presentation – July 20, 2005 (PDF) (20 pp, 4.2MB)
  

Basin Bulletin issues with articles on East Mission Flats

• Two Sites Proposed for New Repositories in Upper Basin (PDF) (12 pp, 1.2MB) – April 2010
• Our environmental cleanup: A look back (PDF) (14 pp, 1.4MB)
• Basin Commission Meeting, Field Trip: August 19 (PDF) (10 pp, 526K)
• EPA updating ROD Cleanup Plan (PDF) (12 pp, 312K) – April 2009
• EPA to Update Cleanup Decisions for Upper Basin – ROD Planning Under Way (PDF) (8 pp, 155K) – December 2008
• Milestone Reached: Box Property Cleanups Complete (PDF) (8 pp, 173K) – August 2008
• Children’s Blood-Lead Testing Coming This Summer… (PDF) (12 pp, 166K) – April 2008
• East Mission Flats: Agencies Respond to Questions (PDF) (6 pp, 251K) – December 2007
• Basin Institutional Controls Program Coming this September (PDF) (10 pp, 282K) – August 2007
• Basin Commission Board Changes (PDF) (8 pp, 175K) – April 2007
• Major Milestone Achieved: Cleanup of Box Residential & Community Areas Complete (PDF) (8 pp, 292K) – Winter 2006-07
• Bunker Hill Sitewide Five-Year Review Completed (PDF) (8 pp, 141K) – Autumn 2005
• NAS Report Released, Progress on Yard Cleanups, More… (PDF) (6 pp, 196K) – Summer 2005

 

 

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