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drainage structures, which if not retained as a permanent feature to support the postmining land use would <br />be reclaimed. <br />The soil/spoil material balance as of December 31, 2017 for the remaining life -of -mine is calculated as <br />follows: <br />Mine Area Summary <br />Total disturbance area = 850.5acres <br />Areas where soil has been replaced = 845.6 acres <br />Remaining disturbance area requiring soil = 4.9 acres <br />Soil in stockpiles (Table 13.1) = 36.7 ac -ft <br />Mean replacement depth available = 7.5 feet (90 inches) <br />During 2007, topsoil thickness sampling was conducted over the topsoiled area on a 500 ft. grid. Refer to <br />the 2007 Yoast Mine Annual Reclamation Report. The overall average soil replacement depth for the <br />areas reclaimed to date is 21.4 inches. The 21.4 inches is consistent with the premining projections of 21.6 <br />inches. <br />TABLE 1- SOIL <br />W <br />STOCKPILE VOLUMES (as <br />2008 2009 <br />Volume <br />of 12/31/2016) <br />2010 2011 2013 2014/2015 <br />VolumeVolume <br />Volume Volume Volume <br />10 10 10 10 <br />A <br />10 <br />10 <br />B <br />13 <br />13 <br />13 13 13 <br />13 <br />C <br />13.7 <br />13.7 <br />13.7 13.7 13.7 <br />13.7 <br />D <br />0 <br />0 <br />0 0 0 <br />0 <br />E <br />0 <br />0 <br />0 0 0 <br />0 <br />F <br />0 <br />0 <br />0 0 0 <br />0 <br />G <br />0 <br />0 <br />0 0 0 <br />0 <br />H <br />I <br />0 <br />0 <br />0 0 0 <br />0 <br />24.3 <br />24.3 <br />0 0 0 <br />0 <br />K <br />0 <br />0 <br />0 0 0 <br />0 <br />L <br />9.5 <br />9.5 <br />4.5 4.5 0 <br />0 <br />M <br />0 <br />0 <br />0 0 0 <br />0 <br />O <br />P <br />0 <br />0 <br />0 0 0 <br />0 <br />0 <br />0 <br />0 0 0 <br />0 <br />Q <br />0 <br />0 <br />0 0 0 <br />0 <br />R <br />0 <br />0 <br />0 0 0 <br />0 <br />TOTAL <br />70.5 70.5 <br />41.2 41.2 36.7 <br />36.7 <br />REVEGETATION <br />Seeding and Shrub Planting. 3.4 acres were inter -seeded in the area of the Pond 12 slide in 2014. No <br />additional seeding or shrub planting occurred in 2017. Table 2 is the approved seed mix for upland sites <br />and ephemeral drainages. <br />4 <br />