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The Leadville Mill <br />ONSITE PERSONNEL <br />UMC's mill manager 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 <br />retained an Owner's Engineer, who is a Registered Professional Engineer and a <br />Professional Land Surveyor in the State of Colorado, to monitor the contractors. <br />UMC has contracted clearing and grubbing, topsoil removal and storage, <br />impoundment excavation and embankment construction, clay material <br />segregation, geosynthetic clay liner installation, leak detection installation sump <br />construction, and impoundment liner installation. UMC crews will place historic <br />tails in the TSF, construct and place ballast tubes on the impoundment sides, install <br />tailings slurry pipes to the impoundment, and install the decant water pumping <br />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 />M 1990 -057 <br />EXHIBIT C — MILL PLAN <br />Page 4 -15 <br />• Performed by contractor, monitored by Mill Superintendent and /or Owner's <br />Engineer. <br />• Quantity check between planned and actual material moved. <br />IMPOUNDMENT EXCAVATION AND EMBANKMENT CONSTRUCTION <br />• Performed by contractor, monitored by Mill Manager and /or Owner's <br />Engineer. <br />• Slope stake exterior and interior embankment slopes. <br />• Red top embankment slopes as being constructed by contractor. <br />• Grade top of sub base on interior slope and bottom of impoundment ( ±1 ") on <br />50ft grid. <br />• Monitor compaction lifts, compaction equipment in conjunction with contract <br />soils engineer. <br />Version 1.0 April 2013 <br />