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of the mill liner area. Figure 3 and 4 demonstrate the location of the liner beneath the HGM. <br /> Figure 4 also shows approximately five feet of freeboard to capture stormwater and fluids from <br /> the mill area. The tertiary containment was designed as a sink or basin to capture stormwater or <br /> spilled process fluids. This is in line with Amendment 10, Volume 1, Exhibit U, Section 6.6, <br /> Storm Water Control at the High Grade Mill Facilities, "Any potential leaks or spills on the High <br /> Grade Mill platform surface will flow to the sump and any infiltration will be contained within <br /> the lined areas of the High Grade Mill platform."Design of the HGM platform lined area was <br /> completed using a 100-year/24 hour storm event of 3.5 inches of rain in 24 hours. <br /> _s <br /> �e3oa; <br /> 41 <br /> Pam' <br /> 1, <br /> f Yr f/ ,-! ' fix,•; '+ 1 r1;-c; <br /> FUTURE MIL <br /> LINER AREA ' _ - <br /> 'i <br /> Hill <br /> ry�j/Jjy, { fyy//^yj��r <br /> ri,__c T <br /> / t�� /1�1 <br /> XI41NG, <br /> SEA NO-t, 4 <br /> Tv <br /> `- _ :: __ •',f{f.,����'..,,.... 'f ✓� ��� (. � :; �; -fir <br /> Figure 2: Plan view of the mill liner area. The area containing the blue dashed lines is the currently lined area <br /> immediately beneath the HGM and support buildings and structures. Source: Mill Site Earthworks, Re-issued for <br /> Construction,August 16,2012:Overburden Storage Area,Top of Geomembrane Grading Surface Plan View,Rev 3,p.5. <br /> The capacity of the liner system beneath the HGM platform is approximately 16.8 million <br /> gallons. This capacity is approximately 97 times the volume of one of the vat leach tanks <br />