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0 Contents <br />Section 1 Introduction <br />1.1 Purpose of Investigation .......................................................................1-1 <br />1.2 Regulatory Background ......................................... :.............................. 1-1 <br />1.3 Land Uses in Area of Mine ...................................................................1-3 <br />1.4 Description of Rock Materials Exposed by Mining ...........................1-3 <br />Section 2 Investigation Approach and Activities <br />2.1 Field Sampling ........................................................................................ 2-1 <br />2.1.1 Development Rock Samples .................................................. 2-1 <br />2.1.2 Background Soil Samples ...................................................... 2-1 <br />2.1.3 Native Soil Underlying Development Rock Stockpiles..... 2-1 <br />2.2 Laboratory Analyses .............................................................................. 2-1 <br />2.2.1 Development Rock Acid-Forming Potential Analyses...... 2-4 <br />2.2.2 Total Metals Analyses ............................................................ 2-5 <br />2.2.3 Meteoric Water Mobility Procedure Analyses .................... 2-5 <br />2.2.4 Geochemical Sorption Potential Analyses ........................... 2-5 <br />2.2.5 Physical Property Analyses ................................................... 2-6 <br />Section 3 Assessment of Potential Acid-Forming Rock <br />Section 4 Assessment of Potential Toxic-Forming Rock <br />4.1 Potential for Direct Contact Risks ........................................................ 4-1 <br />4.1.1 Screening-Level Evaluation ................................................. .. 4-2 <br />4.1.2 Further Assessment of Arsenic in Development Rock .... .. 4-3 <br />4.1.3 Evaluation of Inorganic Constituents not Addressed by <br /> BLM ......................................................................................... .. 4-6 <br />4.1.4 Background Soil Concentrations ........................................ .. 4-6 <br />4.1.5 Summary of Findings ........................................................... .. 4-7 <br />4.2 Potent ial Leachate Migration Risks ................................................... .. 4-8 <br />4.2.1 Screening-Level Evaluation ................................................. .. 4-9 <br />4.2.2 Volume of Percolation through Rock Piles ....................... .. 4-9 <br />4.2.3 Attenuation Capacity of Soil Underlying Rock Piles....... 4-14 <br />Section 5 Conclusions <br />Section 6 References <br />0 C <br />TM4986-Denison Mines\Ta