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1-. f ~.. ._ ~ ... .. .. ,. .. ~ .. .. .. ._._.... <br />ZORICH - ERKER ENGINEERING, INC. <br />noted. <br />Page 6 <br /> <br />The total inflow over the life of the mine was estimated to be <br />175 acre feet. No significant inflow is expected to occur until the end <br />of year 3. Through years 4, 5 and 6, approximately 1/2 of the total <br />estimated inflow or about 88 acre feet, will occur. The maximian inflow <br />is expected in year 7 when the mine is at its deepest, Trost developed <br />level. FYvm that time until the operation concludes, the inflow rate <br />should decrease dramatically in relation to the quantity previously <br />drained and the amount of backfill that occurs. <br />The groundwater in the area of the proposed mine is high in <br />radioactive elements, TD3 and sulfate. These high values are directly <br />related to the ore occurrence in the sandstone beds in the Salt Wash <br />manber. The high T~ and sulfate tends to indicate the groundwater <br />does not receive any appreciable surface recharge. This supports the <br />contention that the groundwater occurs in isolated sandstone beds. <br />The high levels of the above constituents can be reduced to <br />F.PA acceptable limits via currently available technology and, thus, <br />should not adversely effect the surrounding environment. <br />Post Mining Hvdrol <br />Upon c~letion of the backfill operation, the groundwater <br />system will experience recharge under normal precipitation conditions. <br />The uniform, mixed backfill material will cause a ~re even water distri- <br />bution in the backfilled pit, since the intertonguing of sandstone and <br />mudstone beds will have been destroyed, but this should not greatly alter <br />the overall groundwater storage capabilities. <br />