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monitoring show that impacts to the ground water aquifers are praci uding its use, Peabody 1 will provide alternate water sources of eaoparab7a quantity and quality. Also discussed in Attachment 16-7 of Teb 16 are the 11 sur/eee water ri gh es the[ could ha potontially affected Dy pit inflow drawdowns. An augmentattan plan, which uCilizea the 114 acre foot cansumpti ye use right Peabody has with the Htghl tna Canal, has been dayel aped to mitigate the potential 26 acre foot Impact to outface hater rt ght users frmo pit inflow drawdowna. The reader is referred to Attachment 16-1 to Tab 16 for a Wore detailed description of the quantities o4 water to be augmented, the asaoeS eked calculations and Me Dian. The inpacta to surface water users x111 De mS nimal and of little significance, as an augmaniati on plan has boon developed that will insure Mat Mose quanti tf as lost will be replaced. Removal of Neils and Ponds by Ml nt no. No surface or ground water rights have been identified within the Nucla permit reytsf on boundary for the Nuela East mining eras (refer to Figure 2 oT Attachment 16-1 to Tab 76). Thus there will De no di tact impact from Ma proposed mining plan on any local water-ri ghted facilities. • Impact of Rapl acnd Spoi] Material on Cround Mater Ft ow and Reeharae Capacity. The pits will remain open only until the coal has been renoyed. Following the short-term inpaets (water level declines) on Che ground water ayatem as a raault of pumpage of ground water i nflox to the p1ta, s potentf al long-term impact to the local ground water flow is Me period of time necessary /er reaaturatS on of the spoil material and reestabiishoent pf a f]ow gradient. A wide range in permeabiltti es for spoil meters al can occur, depending on how it is placed. Rahn (197fi) reported that spoil masers al .replaced using a dragli ne in one instance and a aeraper in another, yielded hydraulic conducts vi ties of 35.3 ft/dsy and 0,4 ft/day, respects yel y. Van Veast and Hedges (1975) concluded Mat greater porosities end hydraulic eonduetiyi ties will result from yotume changes (approximately one-fourU greater) between spoil material in its origi nel compacted, stratified state, end in its rearranged state follontng reel acement, rcgardlesa of the method of pl aesment used. Spoil material at the Nucla and Nucla Eaat ni ni ng ereaa wi 11 be replaced using aeyaral tachnf ques. Same spoil aayemsnt at either mini nq area M11 ba accompli shad using cast blasting. The remaining ni ni ng et Ma Nuela mi nS ng area will be conducted wtM aerapers t7-27 Reyt sad 04/ll/aB • REVISED MARCH 2006 Attachment 2.05.6(3)-2-34