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f <br />1 <br /> The mine water balance for the 1983 water year is pro- <br /> vided in Table II.3-1. Imported water during the year <br /> slightly exceeded the additional water removed in mine <br />' <br /> coal and gob as estimated from the moisture content in <br /> excess of the in place moisture of coal. The remaining <br /> imported water is thought to be loss to evaporation. <br /> The mine water discharge of 2.34 acre feet occurred <br /> primarily during the months of May and June when in- <br /> <br /> flows were greatest. This discharge is less than 40% <br />' of the estimated mine inflow. The remaining inflow is <br /> thought t o have infiltrated into the coal or was evapo- <br />' rated by mine ventilation. <br />Mine water discharge was treated in sedimentation pond <br />MB-1. Untreated mine water would be expected to have <br />' water quality characteristics similar to that reported <br />in Table I.4-2. These results indicate that mine water <br />should meet all NPDES discharge limits. <br />' Mine water inflow for Water Year 1984 is expected to be <br />' similar to that experienced during Water Year 1983. <br />Possible discharge of mine water would be of such a <br />~, small quantity and short duration that any discharge <br />' from the sedimentation pond would be dominated by <br />treated storm water runoff. <br /> <br /> <br />' -29- <br />