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Mr. Tim Cazier, DRMS <br />Page 2 <br />7. Magnetite Material Safety Data Sheet ( "MSDS ") <br />8. Aries 2607 Coagulant MSDS <br />9. Aries 1668 Flocculent MSDS <br />10. AMEC Drawing No. A100 - Concrete Pad and Liner Extension Plan View <br />11. AMEC Drawing No. A200 Concrete Pad and Liner Extension Sections and Details <br />12. CC &V Drawing No. C -4b: Growth Medium Stockpile Locations <br />13. CC &V Drawing No. C -4b: Revised Growth Medium Stockpile Locations <br />14. Ellis Environmental Demolition Cost Estimate <br />Existing Conditions and Operation of Arequa Gulch Valley Leach Facility <br />Current operations at CC &V include the Arequa Gulch Valley Leach Facility ( "AGVLF ") and <br />the Arequa Gulch adsorption, desorption, and recovery ( "AGADR ") facility. Both the AGVLF <br />and AGADR are under -lain by synthetic liner systems. Process ( "barren ") solution is applied to <br />the AGVLF using a network of pipes, distribution tubing and drip emitters. The gold -laden <br />process (or "pregnant ") solution is collected in four discrete internal ponds or Pregnant Solution <br />Storage Areas ( "PSSA's "). Each PSSA services a particular area of the AGVLF and pregnant <br />solution from each pond is pumped to the pregnant solution head tank ( "Preg Tank ") ahead of <br />the AGADR in separate lines; the combined pregnant solution mixture then flows through the <br />AGADR. Barren solution exiting the AGADR is pumped back to AGVLF. A portion of the <br />pregnant solution is blended with barren solution and sent back out onto the AGVLF as <br />enrichment solution. <br />The construction activities of the below -grade components of the PSES were completed in early <br />2012 and were permitted through previously approved TR 64 to Amendment No. 9 to Permit M- <br />1980 -244. TR 10 -01 only addresses the above -grade components of the PSES. <br />Primary Purposes of the PSES <br />The PSES was conceptually developed as a method, using basic coagulation/sedimentation <br />processes, to stabilize and clarify the barren solution. Primarily, the PSES is being added to the <br />processing circuit at CC &V to: <br />• Remove a persistent accumulation of metal precipitate solids in process solution from the <br />AGVLF operations. Once operational, the PSES will also allow for more sustainable and <br />even distribution of barren solution onto the AGVLF. <br />• Improve targeted flow rates through both the AGADR and the AGVLF, <br />• Improve gold recovery from the process solution, and <br />• Ultimately ease the AGVLF closure burden by dropping out metals in the process <br />solution over many years. <br />Conditions and Operation of AGVLF as a Result of the Inclusion of the PSES <br />Process solution, upstream from the carbon trains within the AGADR will be directed to and <br />from the PSES, through the AGADR facilities, then again to and from the PSES. The <br />subsequent enhanced barren solution will then be distributed onto the AGVLF as currently <br />