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Kerr (Marc) Mine - 2,008 Annual Hydrology Report <br />6.0 MINE AREA SURFACE WATER <br />The sediment ponds (Stations 301, 302, 304, 305, and 321) were monitored weekly from March <br />through June and monthly during the remaining months through September, 2008.. Some discharges <br />were observed from 301, 302, 304, 305 and 321 from May 151 through May 14. No visible oil & grease <br />was observed in the outflows. Station 303 (Pond C) was reclaimed during 2006 so there are no <br />potential discharges after that time. In 2008, the ponds filled at least partially during April and May and <br />retained some water through most of the summer. It was reported-that the vertical stand pipe (steel <br />discharge pipe) was leaking below the primary discharge outlet holes at ponds A and D. The local <br />contractor was called in and temporarily repaired the leakage in the standpipes. No damage occurred to <br />any of the structures. During October, when the ground approaches were drier, the contractor returned <br />and completed permanent repairs to the discharge pipes under the supervision of George Patterson of <br />Kerr. Samples were collected during the discharge period and analyzed. The field and laboratory <br />measurements for the 2005-2008 water years are presented in Table 3, Mine Area Surface Water Data. <br />The 2005-2008 average pH and flow data for each discharging station are presented on Figure 4, Mine <br />Area Surface Water Average pH vs. Flow (2005-8). The recorded measurements and field <br />observations are contained on the field data logs in Appendix A, 2008 Field Data. The analytical data is <br />presented in Appendix C. <br />Discharges at the mine over the previous 7 years have been very minimal. 2005 and 2007 had the <br />greatest number of discharge events. There were no discharges at the mine for any pond in water <br />years 2001, 2002 and 2004. In 2007, there were 3 discharges from each of the 5 ponds including Pond <br />B. During 2008, there were two discharges from the 5 ponds and one additional small discharge from <br />Pond E. <br />Kerr N ine/AHR 20os Page 6