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Historic Tailings Replacement <br />Following pond construction and liner installation, the historic tails, and magnetite will be placed back in <br />the Phase 1 TSF. The historic tails stored on the temporary storage pad will be moved to the edge of the <br />TSF by front -end loader, and washed down the slope of the TSF with water from the TSF. The clay liner <br />pad under the historic tailings will be incorporated into the fill construction of the lower access road. <br />0WOC <br />The Quality Assurance /Quality Control (QA/QC) Plan for the TSF is as follows. <br />Onsite Personnel <br />UMC's mill superintendent or qualified designate will be on site at all times construction <br />activities are being conducted by UMC crews or by contractor crews. UMC has retained an <br />Owner's Engineer, who is a Registered Professional Engineer and a Professional Land Surveyor <br />in the State of Colorado, to monitor the contractors. UMC is contracting clearing and grubbing, <br />topsoil removal and storage, impoundment excavation and embankment construction, clay <br />material segregation, geosynthetic clay liner installation, leak detection installation sump <br />construction, and impoundment liner installation. UMC crews will place historic tails in the TSF, <br />construct and place ballast tubes on the impoundment sides, install tailings slurry pipes to the <br />impoundment, and install the decant water pumping station. <br />General Site Preparation <br />• Stake tree clearing /topsoil removal limits for TSF. <br />• Stake grubbing limits for existing tailings storage pad. <br />• Slope stake storage pad for existing tailings. <br />• Oversee tailings storage pad layout and grading. <br />Clearing, Grubbing/Topsoil Removal /Storage <br />• Performed by contractor, monitored by Mill Superintendent and /or Owner's Engineer. <br />• Quantity check between planned and actual material moved. <br />Impoundment Excavation and Embankment Construction <br />• Performed by contractor, monitored by Mill Superintendent and/or Owner's Engineer. <br />• Slope stake exterior and interior embankments. <br />• Red top embankment slopes as being constructed by contractor. <br />• Grade top of sub base on interior slope and bottom of impoundment ( +/- I") on 50' grid. <br />M1990 -057 May 14, 2013 <br />