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<br />T. Length in avatar (feet) is the same as the total length of the cuts for each year. <br />3. Timp in wetar is the result of dividing the length in water Far a given year by the <br />pit advancement per day for the same year. ibis value represents the number of days <br />the pit will ba open and subject to pit Snf iow each year. <br />4. Pit advancemarrt is the constant length in feet per day that the pit will advance for <br />the year. It is calculated by dividing the total area to be mined Sn a gi van year by <br />a eenatant Dtt witlth. The cons Cant pit width use for yearn 1 and 2 is 150 feet. For <br />years 3, 4. and 5 a constant pit width of 105 feat was used. <br />5. Tha geonrotric mean values far iranami ssi vi Cy, hydraultc conductivity, and storage <br />coefficient were collected from aquifer teats and determined by uaf nq the following <br />equation: <br />X9 = (X1 y'XT,aX3...Xn)1/n ' <br />6. The sa tvratetl thickness for each aquifer was based on water tavel monitoring values <br />that were representati va of the arse to Da mined in a given year. <br />• 7. DWITURAL is the amount of aquifer through lion which will be inCereepted by each <br />years pit advancement in gall one. <br />8. gDRA1NACE is the linear portion of Intl ow from aquifer sioragp to gallons. <br />9. DTOTAL 1s the sum oT QWITURAL and gDRAI WIDE for a given year in gallons. <br />Mining in Nucla Eaat is projected to intercept both the overburden and Dakota coal <br />aquifers for ell flue year. <br />NODFLOM Anal ysia for Calculaii ng P/[ Inflows and Drawdoms. <br />Introduction. NODFLOIi was usatl to model changes in the ground water system to the <br />vi ei nl Cy of the Nuela mf ning complex caused by Sit dewatering. Simulations for both the <br />overburden and coal aquifer rrere performed. No modifications to the HODFLOW code wore <br />necea eery. <br />17-9 Ravt aed 04/17/BB <br />• <br />REVISED MARCH 2006 Attachment 2.05.6(3)-2-16 <br />