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<br />Tha elongate geometry of the Dit affects the shape of the overburden tlrawdown contours at <br />- short di atancesl at greater distances, the Contours ere cS realer, as if the pit itself <br />were circa] er. <br />Tha overburden drawda~m contours do not intersect any of the boundaries, therefore no <br />impact to the San Miguel River from drswdonn 1n the deeper part of the overburden is <br />predicted. Shallow aquifer flow into Tuttle and Calamt ty Draws in the vicinity of the pit <br />rill De decreased, but will be offset by punpaga frps the pit. <br />Tha drawdown for the coal simulation was 8.0 ft during year 1, 5.6 ft tlu rS ng year 2, 6.0 <br />ft during year 3, 7.3 ft during-year 4, and 8.0 it during year 5. The resulting coal <br />drawdw+ns after each year are shown to Figures 17-9 through 17-13. Soma boundary affects <br />era evident on the coal drawdown plots as the drawdorm eventually intercepted all four <br />boundaries, including the San Miguel River, <br />Table 17-4 presents the simulated annual inflow for the overburden and coal ainulati one. <br />The greatest inflow is during the fifth year. when the pit 1s the deepest. These raise <br />represent an average for the year. Tha si wleted rates are greater in the beginniig of <br />each simulation year because of the instantaneously imposed change in pit depth, eecauae <br />• the Dit w{11 not be instantaneously deepened, the average rates ere meta realistic than <br />the slighCly higher peak ratm. <br />During the last tine step of each year, little change in water levels occurred in the <br />si wul ations. The approai mate steady-ataCe nature also can be seen by comparing the inflon <br />rates for the first trro years (TeDle 17-4). These rotas era very similar. <br />Attechnent 16-1, Tab 76 and, in particular, Tablo 70 within gttachmen! 76-t address the <br />ground and surface water rights in The tomedlate vl c7 pity of the Nucla and Nucla East <br />mining areas Chat could potentially be affected Dy pit Snflow drawdonns. Tae <br />water-righted wells are completed in deeper aquifer antra and should not be si gnifieantly <br />affected by Dit induced drawdowns Sn the overburden. Peabody will attempt to satur• <br />pernisai on to monitor water levels in r{ghted walla M-9 and K-4l (the Cwo shallonest <br />completi one) and is proposing to install up to five overburden pi ezonetera in the <br />i msediatB v; ni ni ty of Tha Nucla Easi mining area to help insure that the drawdown <br />pro~eeti one era reasonably accurate and that the local water ri ghCs are protected. <br />l mpaeta Co the local ground water users should be inai gnif leant. Sh ou7d the proposed <br />77-20 Ravi sad 04/17/88 <br />• REVISED MARCH 2006 Attachment 2.05.6(3}2-27 <br />