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• Mine Inflow <br />Ground water inflow into the mines was calculated <br />from the basic data using the following assumptions. <br />1) Prior to mining operations which will withdraw <br />support from the mine roof in selected Locations, <br />vertical ground water flow in the coals, and in the <br />overburden, and between the coals and the over- <br />burden is negligible (based on observations <br />discussed on page G-79). <br />2) Maximum inflow conditions are to be used and <br />these will occur when the lowest point being mined <br />is reached and the pillars have been pulled. At <br />that time, the ground water gradient will be the <br />• steepest due to the increase in the elevation <br />difference between the recharge area (to the north <br />in the Danforth Hills) and the discharge area (the <br />lowest mine face), and to the decrease in the <br />horizontal distance between the recharge and the <br />discharge areas. The area through which inflow will <br />occur will also be maximized when the mine is at <br />its deepest extent (page G-81). <br />3) The area through which ground water inflow will <br />occur has a transmissivity which is represented by <br />the combined transmissivities of the coal and the <br />sandstone in the overburden (page G-80). Note this <br />maximum will occur after the pillars have been <br />pulled, assuming no vertical flow between the coal <br />and the overburden prior to pulling the pillars. <br /> <br />f C1 Leonard Ria ConsutGq Water Engiree~s. Yic. <br />