2009-04-27_REPORT - C1981014 - Laserfiche WebLink

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EFC1 Southfield Mine - 2008 Annual Hydrology Report April 15, 2009 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 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'/2SE'/4, Sec 26 NC-l W'hNE'/4, Sec 19 MC-1 E'/2NW'/4, Sec 30 MC-2 WV2NE 1/4, Sec 30 SA-1 E'/2NW'/4, Sec 24 NPDES 002 E'/2NW'/4, Sec 30 NPDES 004 W'/zSE'/4, Sec 19 Designation Newlin Creek (Upper) 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 stations (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. As of October 2003, in accordance with Technical Revision 35 (TR-35), monitoring of surface water is now 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. Field and laboratory data for the 2008 water year are provided in Appendix B; no discharges occurred in 2008 so there is no corresponding field or analytical data enclosed. Lower than normal precipitation in late winter and spring resulted in none of the typical 2„ d quarter flow events in Newlin Creek. It remained dry the rest of the year similar to nearly all preceding monitoring periods. Dry creek beds were observed in Magpie Creek and in Second Alkali Creek throughout the period of this report. 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 2008, but did contain puddles or were partially filled in March , then during July 2008 AHR.doc WP Page 18