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US Steel Minntac Tailings Basin

US Steel Minntac Tailings Basin. Observed Average Sulfate Concentration and Mass in Rivers and Seeps. * 545 gpm at conc of 811 mg/L (Flow f rom Table 6.2 "Simulated Versus Estimated Seep Flow Rates and Groundwater Discharge Rates" - CRA June 2013 Report:)

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US Steel Minntac Tailings Basin

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  1. US Steel Minntac Tailings Basin

  2. Observed Average Sulfate Concentration and Mass in Rivers and Seeps • * 545 gpm at conc of 811 mg/L (Flow from Table 6.2 "Simulated Versus Estimated Seep Flow Rates and Groundwater Discharge Rates" - CRA June 2013 Report:) • Calculations are based on observations from approximately 2000 to present except for the Dark River Stream which are from 3 measurements from November 2011 to September 2012

  3. Comparison of Observed Sulfate Mass in Rivers to Basin Seepage Estimates

  4. Proposed Compliance Points Existing Well – Johnson Cr. Watershed Existing Well – Sand R. Watershed Little Sandy Lake Inlet Dark River @ CR 668 GW012 Proposed Boundary MW Headwater of Dark R. or Seep Admiral Lake Timber Creek

  5. Potential Analytes in GW and SW Classes

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