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RCRA FACILITY INVESTIGATION (RFI)

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Refinery Layout

RCRA Facility Investigation (RFI) Approach

 

The primary objectives for the proposed RFI activities are to utilize an iterative framework to collect the necessary, relevant, and targeted data to:

  • Delineate impacts of areas to be investigated

  • Evaluate potential groundwater migration pathways

  • Evaluate impact, if any, to the shallowest potable aquifer – Sunburst Formation

  • Investigate refinery on-site sewer system

  • Delineate impact from legacy refinery operations

  • Evaluate utility preferential pathways (i.e. West Rail AOC-39 to the Missouri River)

  • Characterize natural source zone depletion

 

RFI Phase 2 Scope of Work

  • Drill 3 Shallow Monitoring Wells

  • Drill 1 Deep Monitoring Well

  • Conduct 5 Soil Borings

  • Advance 4 Electrical Resistivity Imaging Confirmation Borings/Temporary Wells

  • Abandon 13 Monitoring Wells

  • Conduct Hydraulic Slug Testing on 2 Monitoring Wells

  • Collect One Round of Groundwater Samples from 96 Monitoring Wells

  • Conduct Porewater Sampling at 14 Locations within the Missouri River

 

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Map of RFI Sampling Locations

Map of RFI Porewater Sampling Locations

RFI Road Map

DEQ Approves Final RFI and BRA Work Plans

2023 Q2

CMR Conducts RFI Phase 1 Investigation

2023 Q3 thru 2024 Q2

CMR Prepares RFI Phase 1 Investigation Memo and Phase 2 Work Plan

2024 Q1 thru 2024 Q4

CMR Conducts RFI Phase 2 Investigation

2025 Q2

CMR Prepares Draft and Final RFI and BRA Reports

2025 Q3 thru 2026 Q2

DEQ Approves Final RFI and BRA Reports

2026 Q3

Key: Baseline Risk Assessment (BRA​​); Calumet Montana Refinery (CMR); Department of Environmental Quality (DEQ); Quarter (Q); RCRA Facility Investigation (RIF).

Note: A blue border = currently in progress

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