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<br />storage coeffi ci ant. hydraulic gradT ant, and eransmi ssi vi ty ware determined Prom aquifer <br />testa and are presen tad in Table 17-3. <br />Estimates of the overburden and Dakota coal ground water inflow era presented in 7abl as <br />17-1 and 17-2. These estimates were prepared aasumi ng that the total inflow would he <br />dart ved from two pri ncf pal sources: 1) the interception of premini ng flow rates under a <br />natural hydraulic gradient; and 2) the drainage of ground water from storage in the <br />aquifers. The followf ng is a list of assw~pti ons made 1n using the McWhorter pit inflow <br />analysis technique. <br />1. Mi sing intercepts the saturated portion of the pit at the start of each year. <br />2. Tha length of pit opened on a daily basSs is equivalent to the total pit length <br />di vi dad by the number of days required to open the pit. <br />3. Each dally pit inerenent 1s instantaneously opened. <br />4. Tot el pit inflow par year is equal to the sum of {ncrementeO daily inflows for that <br />• yser. <br />5. Pit Inflows for each year sre Independent of residual effects from preceding years. <br />The method therefore tends to overosti oats the amounE of water coming into the pit. <br />6. Hydraulic Conductt vi ty, 5toraga eoetf iciest, and depth of saturatS on are constant for <br />each ml ne pit for each year. <br />7. Pit inflow is from two sides for the Ti rat yser end from one side for all remaining <br />years (i .e., there is no addl ti onal flow free the reel ai mad apol7s). <br />8. Natural - gredi ant floe to over Tha entire saturated length of the Di t, no <br />eorracttons are Dade for the orientation of the pit in re7 ati on to the gradient <br />di reefs on: hence, the saturated pit length to aacuned to ha perpendicular to the <br />gradient direction. <br />9. Natural - gradient flux is unafleeted by reclaimed cpoils from the preceding year. <br />17-4 Revf sad W/71/88 <br /> <br />REVISED MARCH 2006 Attachment 2.05.6(3)-2-11 <br />