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EFCI Southfield Mine — 2013 Annual Hydrology Report August 1, 2014 <br />Locations previously monitored on Oak Creek, both upstream and downstream, were eliminated in <br />accordance with approved Technical Revision No. 37. Oak Creek flow measurements made from <br />2000 through 2009, are presented for the two stream monitoring locations on Table 8. Stream flow <br />data from previous years are documented in AHR's on file at the Division. Additionally, field and <br />laboratory water quality data (prior to 2010) for surface water monitoring stations on Oak Creek are <br />documented in previous AHR reports on file at the Division. <br />EFCI monitors any discharges from the two active Loadout area sedimentation ponds, Ponds L -1 <br />and L -2. The current surface water monitoring program includes the following monitoring stations, <br />shown on Map 13, Loadout Monitoring Stations: <br />Station <br />Location <br />Designation <br />NPDES 001 <br />W %NW' /., Sec 17 <br />Pond L- 1(outfall to Chandler Creek) <br />NPDES 002 <br />E1 /2NE' /., Sec 19 <br />Pond L -2 (outfall to Oak Creek) <br />These two sedimentation ponds have historically held only a small amount of water, and have never <br />discharged to the stream system. During 2013, the ponds were dry until a heavy storm event <br />happened in mid September. Immediately after the storm Pond L -2 held water to a depth of <br />approximately 1 foot, while Pond L -1 had only a muddy bottom. No discharge occurred as a result <br />of this storm event, and both ponds subsequently remained dry for the remainder of 2013. <br />2013AHR.doo Page 19 <br />