Calumet Montana Refinery (CMR) Background

• Refinery since 1922.

• CMR acquired the refinery in 2012 and currently produces 30,000 barrels a day.

• Facility was issued hazardous waste permit in 1995.

• September 2012, Hazardous waste permit MTHW‑95‑02 terminated and a Corrective Action Order on Consent (Order) issued by Montana Department of Environmental Quality (MDEQ).

CMR Site-Wide Corrective Actions

As part of the facility-wide corrective action, CMR is required to address petroleum impacted soils and groundwater at the Site. CMR has completed the recent Site Corrective Action activities:

• Feb 2014 through Aug 15 - Conducted lead consolidation area Interim Measure soil removal

• Oct 2018 – Conducted storm sewer lining

• Mar 2019 – Initiated a two-year site wide groundwater quarterly monitoring program

• Sept 2019 – Completed East and West Rail Rack Interim Measure additional investigations

• Sept 2019 – Completed Old Ponded Area Human Health Risk Assessment (HHRA)

• Apr 2020 – Supported USEPA's Optimization Review Report Remedial Process Optimization Study

• Nov 2020 – Completed Truck Loading Rack Interim Measure Final (100%) Design

Agency Oversight

• For more information on MDEQ oversight, please visit: http://deq.mt.gov/Land/hazwaste/RCRA/rcraMRCfactsht