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EFCI SotdhJield Mine — 2014Annual Hydrology Report February 12, 2014 <br />3.4 Surface Water Monitoring Results <br />The current surface water monitoring program includes the following monitoring stations, shown <br />on Map 12, Mine Area Surface and Groundwater Hydrology: <br />STATION LOCATION DESCRIPTION <br />NC -2 E'hSEI /4, Sec 26 Newlin Creek (Upper) <br />NC -1 WI /2NE' /4, Sec 19 Newlin Creek (Lower) <br />MC -1 E %zNW' /4, Sec 30 Magpie Creek (Upper) <br />MC -2 W' /2NE' /4, Sec 30 Magpie Creek (Lower) <br />SA -1 E%NWI /4, Sec 24 Second Alkali Creek, near MW-65 <br />NPDES 002 E' /2NW' /4, Sec 30 Pond 4 (outfall to Newlin Creek) <br />NPDES 004 WI /2SEI /4, Sec 19 Pond 5 (outfall to Magpie Creek) <br />The mine and adjacent areas fall within the lower portions of the Magpie and Newlin Creek <br />drainages and encompass the central portion of the Second Alkali Creek drainage, all of which are <br />tributary to the Arkansas River. Newlin Creek is a perennial drainage above the mine permit area <br />and to its diversion point for the City of Florence Municipal Water Supply. Within the mine permit <br />boundary, flows in Newlin, Magpie, and Second Alkali Creeks are all ephemeral (refer to Section <br />2.04.7 of the approved permit application for more details). EFCI monitors any significant stream <br />flows in Newlin, Magpie, and Second Alkali Creeks at the locations shown above. In addition, <br />EFCI monitors any storm water runoff discharge from the two remaining sedimentation structures, <br />Ponds 4 and 5. <br />Sedimentation Ponds 4 and 5 collect and allow sediment to settle from storm runoff on the <br />reclaimed mine site. In recent years there has been less storm runoff reaching and pooling in the <br />ponds primarily due to increasing vegetative cover. Consequently, no pond discharges have <br />occurred due to storm events in recent years, and none took place during the reporting period. <br />EFCI inspected pond conditions throughout 2014 following significant storm events. Both ponds <br />were dry prior to a localized rain storm in mid- July. The resulting storm runoff produced moderate <br />sized pools in both ponds estimated at approximately 1 foot deep. Another rain storm occurred <br />during the first week of August, adding a small volume of water to both ponds. EFCI measured the <br />water level in Pond 5 at 34 inches below the top of vertical riser. The final heavy rain storm event <br />happened during the last week of August. Immediately after this event, EFCI documented that the <br />water levels in both ponds were just above the bottom of the horizontal gate valve culverts. Water <br />pools in the ponds gradually diminished and were nonexistent by the end of the year. <br />2014 AMR W I= Page 18 <br />