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US Steel Minntac Tailings Basin PowerPoint PPT Presentation


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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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US Steel Minntac Tailings Basin


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

  • SCS = Seepage Collection System


Comparison of Observed Sulfate Mass in Rivers to Basin Seepage Estimates


Proposed Compliance Points

GW013

Little Sandy Lake Inlet

GW014

Dark River @ CR 668

GW012

Proposed Boundary MW

Headwater of Dark R. or Seep

Admiral Lake

Timber Creek


Potential Analytes in GW and SW Classes


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