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2002 0.037 cfs <br />2001 0.019 cfs <br />Average historic flow is 0.045 cfs. Mine pit pumping into this pond is <br />responsible for many of the high peaks present on the hydrograph prior <br />to 2004. TDS values at this site are increasing. Baseline data from Site <br />SW-S2W-SG16 (WSH16) has been provided in Appendix E1. <br />I • <br />L J <br />- Surface Water Site SW-S2W-SG7 (WSH7). This site is located on <br />Hubberson Gulch upstream of the confluence of mine discharges contained <br />in the 006 Gulch, but is downstream of Ponds 016 and 017. Monitoring <br />here began in April 1987. Triannual, rather than monthly, monitoring at <br />this site began in June 2005. Its TDS plot indicates an increasing <br />trend. Baseline statistics for this site have been provided. The Seneca <br />II-W PHC, Table 17-42a, predicts an irrigation season (June-September) <br />average TDS value of 1787 mg/1 for this site., while a value of 1305 mg/1 <br />was observed this year. <br />- NPDES 006 (NPDES6). This site is located on a tributary to Hubberson <br />Gulch referred to as the 006 Gulch. Construction of the 006 Pond was <br />completed October 1989. This pond collects all mine discharges from the <br />central mining area. The first hydrograph supplied shows data for this <br />year; the second shows all data collected since the site began <br />discharging. Review of the flow hydrographs indicates typical seasonal <br />variation due to sn owmelt runoff in the spring, with additional peaks <br />due to pit pumpage, pond clean-out, and rainfall events. The water year <br />average flow values since this pond began to discharge are: <br />2005 0.117 cfs (monthly measurements) <br />2004 0.509 cfs (monthly measurements) <br />2003 0.198 cfs (monthly measurements) <br />2002 0.186 cfs " <br />2001 0.080 cfs " <br />2000 0.099 cfs (from monthly measurements as of 12/99) <br />1999 0.184 cfs (weekly measurements) <br />1998 0.317 cfs " <br />1997 0.343 cfs " <br />1996 0.144 cfs " <br />15 <br />