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The bonding liability problem occurs as a result of where the excess spoil is stored, how <br />much is being generated and stored, and how long it will be stockpiled before it is <br />returned to the pit. As you can imagine, the division will need to cover the liability for <br />disposing of this overburden stockpile. Therefore, we will need to see a more detailed <br />description of the mining sequences and the locations of the processing facilities and <br />various stockpile locations. For example, where will mining begin in each phase and <br />what direction will it proceed in? Will the screening and separating be done in a central <br />location or will the plant migrate with the phases? The primazy information that we are <br />seeking for bonding purposes aze the locations and sizes of the overburden stockpiles. In <br />addition, will this cause less water surface azea and more land area at final reclamation. <br />If it does, the bond will need to be adjusted to account for the additional acres for re- <br />grading, topsoil replacement and seeding. <br />The mining sequence and direction within each phase is also important as to its <br />hydrologic impact. The extraction plan map should be revised to illustrate these <br />features. This is discussed in more detail under Exhibit G. <br />6.4.5 Exhibit E -Reclamation Plan <br />The reclamation plan map needs to be revised to correspond to the new mining plan <br />sequence and structure locations. Also, will the replacement of 1,000,000 cubic yazds of <br />overburden or mine waste cause a change in the post-mining topography? By our <br />calculations it would appear that volume of material would fill an area of approximately <br />15-20 acres to a depth of 40 feet. Therefore, either the reclaimed ponds get shallower or <br />the surface acres to be reclaimed gets lazger. These factors should be taken into <br />consideration when revising the map. Also, if the land area increases as a result, <br />additional topsoil will need to be saved back for replacement at the time of reclamation. <br />Finally, the operator may want to rethink the post-mining land use if additional surface <br />azea is available for revegetation to something other than just rangeland. <br />6.4.6 Exhibit F -Reclamation Plan Map <br />Please revise this map taking into consideration the factors mentioned under Exhibit <br />6.4.5. <br />6.4.7 Exhibit G -Water Information <br />The two reports submitted with the adequacy responses proposed several changes to the <br />mining plan in an attempt to reduce potential off-site impact to the hydrologic regime in <br />the area immediately surrounding the mining site. Obviously the most significant change <br />is the decision to wet mine the site. In particular, this would seem to reduce the impact to <br />the surrounding imgation and domestic wells. The potential impact to the wetlands <br />seems a bit less clear. Following are several additional concerns ttrat will need to be <br />addressed. <br />