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,iistoric Tailings Replacement <br />Following pond construction. 'ffl e- ffl. t°" tti fi, and e,,erliner installation, the historic tails, and agnetite_-, <br />and eld� pad will be placed back in the Phase 1 TSF. _ <br />leaded by ikid sieeF, plaeed iH ±±j*he tfi4ii9gs thiekener, water added to a 709t S <br />o the designed a <br />SFT'he 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 TS. <br />F The clay liner <br />pad under the historic tailings will be incorporated into the fill <br />construction of the lower access road. <br />OA/0C <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,., grog nthetic, lay liner installation' " 'gym, leak detection <br />in,tallationrmd -sump construction,110jmpoundment liner installation, EtHd ` eo' e tlle 1i <br />. UMC crews will place historic tails in the TSF., .• ...,. ..- •., 11 Z.1 . —, 1. <br />lmer, construct and place ballast tubes on the impoundment sides, install tailings slurry pipes to <br />the 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 ( +/- 1 ") on 50' grid. <br />M1990 -057 A--zo.4 "-2414 Vlav 14,201-1;-,`/ <br />Formatted: Font: 11 pt <br />Formatted: Font: 11 pt <br />Formatted: Font: 11 pt <br />Formatted: Font: 11 pt <br />Formatted: Font: 11 pt <br />Formatted: Space Before: 12 pt <br />Formatted: Font: 11 pt <br />Formatted: Font: 11 pt <br />Formatted: Font: 11 pt <br />Formatted: Font: 11 pt <br />Formatted: Font: 11 pt <br />Formatted: Font: 11 pt <br />Formatted: Font: 11 pt <br />Formatted: Level 1, Space Before: 12 pt <br />i <br />Formatted: Font 10 pt, Bold <br />Formatted: Right <br />Formatted: Font: 10 pt, Bold <br />