2012-05-03_REPORT - C1981014 (2)

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EFCI Southfield Mine — 2011 Annual Hydrology Report 3.3 Surface Water Monitoring Results Mine Area The mine and adjacent areas fall within the lower portions of the Magpie and Newlin Creek drainages and encompass the central portion of the Second Alkali Creek drainage, all of which are tributary to the Arkansas River. Newlin Creek is a perennial drainage above the mine permit area and to the diversion point for the City of Florence Municipal Water Supply. Within the mine permit boundary, flows in Newlin, Magpie, and Second Alkali Creeks are all ephemeral (refer to Section 2.04.7 of the Southfield permit application for more details). EFCI monitors any significant stream flows in Newlin, Magpie, and Second Alkali Creeks, and also monitors any storm water runoff discharge from the two remaining sedimentation structures. In the mine site area, the current surface water monitoring program includes the following monitoring stations, located as shown on Figure 1, Mine Monitoring Locations: Station Location NC -2 E %2SE1/4, Sec 26 NC -1 W' /2NE1/4, Sec 19 MC -1 E'' /2N W' /4, Sec 30 - -- - -- - - -- - -- -- - -- - - - - - MC-2 W1/2N E' /4, Sec 30 SA -1 ; E'/ N W'/4, Sec 24 NPDES 002 E %2NW1/4, Sec 30 NPDES 004 1 W '/SE'/4, Sec 19 2011 AHR text doe Page 16 Designation Newlin Creek (Upper) April 25, 2012 Newlin Creek (Lower) Magpie Creek (Upper) Magpie Creek (Lower) Second Alkali Creek, near MW -65 Pond 4 (outfall to Newlin Creek) Pond 5 (outfall to Magpie Creek) Two sediment ponds and associated outfalls (001 and 003) were removed and reclaimed in conjunction with final mine reclamation activities. In Addition, EFCI no longer includes previous monitoring data from the single monitoring point that existed on Newlin Creek prior to second quarter of 1997, when the two current monitoring points were established. Surface water monitoring is conducted on a semi - annual basis, typically in April and December. Field and laboratory analysis data for surface water monitoring stations are summarized in the following discussions. Stream flow measurements since 1999 are provided in Table 8, and field and laboratory data for the reporting period are provided in Appendix B. No NPDES discharges from ponds occurred in 2011 so there is no corresponding field or analytical data enclosed. Dry creek beds prevailed in Newlin Creek, Magpie Creek and in Second Alkali Creek throughout the reporting period. Historic field and laboratory water quality data for the surface water monitoring stations on Newlin, Magpie, and Second Alkali Creeks are summarized in Tables 9, 10, 11, 12 and 13. The two sedimentation ponds (Ponds 4 and 5) did not fill to the point of discharge during 2011, but did contain small pools in the 2n and 3rd quarters from rain events. Ongoing monitoring of surface flows for Newlin, Magpie, and Second Alkali Creeks provides for identification and evaluation of any future changes in water quality that may result from mining and related activities. Surface water quantity and quality monitoring results through the reporting period indicate no significant impacts to surface water as a result of mining, reclamation, and related activities.