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The Leadville Mill M 1990-057 <br /> EXHIBIT U—DMO-EPP <br /> Page 14-13 <br /> 14. 7.3 (C) ALTERATION TO NATURALLY OCCURRING GEOL. & GEOCHEM. COND. <br /> WMG Leadville Mill will not alter natural geological or affect geochemical conditions at <br /> the facility. Only RoM material ores meeting mill acceptance criteria will be processed. <br /> tFeated arigiRates fFep; Aff site se-rees The material will he treated withip the <br /> fac-614y and will be eitheF shipped eff site as pFeduet (eeReeRtrate) 9F Ste-Fed in the <br /> site adeuble lined TCC <br /> 14. 7.4 (D) MONITORING SYSTEMS <br /> Tailings will he M.A-Rite—red duFing the mull eptffimii�atien phase. A saMPIiRg PFE)gFaffl h <br /> wheFe a 4in PVC pipe and badeF will be used te sample leac-hate geReFatien 'R the evefft <br /> there is leakage in the A tailings sump (Figure 4 8, Section A-A) using a 4in PVC <br /> monitoring well will be periodically sampled. In the unlikely event water is <br /> encountered, a sample will be collected and analyzed. The analytical data will be used <br /> to determine the potential source of the sample. A technical report will be submitted <br /> to CDRMS summarizing technical findings and recommendations <br /> Surface water will be sampled on a quarterly basis as ill,,.UStFted outlined in Sections <br /> 14.12 and 14.19. <br /> l IAAC has desiarRed DMQ FeageRt Leadville Mill has secondary containment featwFes <br /> nte the „.,ill as identified d On Pi „ra, 4-1 thFuFigure . These feat-Wes ineludeper-paeks <br /> f9F liquid reageRtS iR excess of 515 galleAs, and a sealed sump at the lowe-st .'evel Af the <br /> moil-building-design structures and operating practices such as sumps, impermeable <br /> flow barriers, and double lined (over pack) chemical storage containers. The <br /> summarized features are illustrated on Figure 4-9 and 4-10. <br /> additieR, grab samples ef the a4eeted R;PiA*;; will he ebtained within 24 hetAFS E)f <br /> e6GUFFeRiee selpt to a labeFateFy fE)F analysis. AR analytiea! Spill Fespense data sheet <br /> ydill ha ;Ppt to CDRMS ,.,i+hir, 14 alays of r pt Af Iaher;+a,r" resu its. <br /> Quarterly surface and groundwater water sampling results will be submitted to CDRMS <br /> annually. If chemical spills occur outside of the containment structures, emergency <br /> response activities will be initiated as outlined in Section 16. Grab samples of the <br /> Version 3.0 January 2021 <br />