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and the dredging of this pond that occurred in the summer of 1996 and <br />the fall of 1997. An upstream presettling pond was added in March 1998. <br />The principle spillway elevation was changed again, and the dewatering <br />orifice removed, in August 1998. Also affecting discharges from this <br />pond are the pumping of water from this pond for water trucks and the <br />pumping of water into this pond from the mine water supply well <br />(WTC201). Review of the TDS plot indicates an increasing trend due to <br />runoff from mine spoils. Baseline data for this site (WSH6) has been <br />provided in Appendix El. <br />- Surface Water Site SW-52W-FG1 (WSHF1). This site is located on <br />Hubberson Gulch downstream of the 006 Gulch confluence. It has been <br />monitored since July 1979. Irrigation ditches were established adjacent <br />Chis site in July 1999. The TDS plot indicates an increasing trend. <br />Baseline water quality statistics have been provided. The Seneca II-W <br />PHC predicts an irrigation season (June-September) average TDS value of <br />2193 mg/1 for this site, while a value of 1825 mg/1 was observed this <br />year. <br />- NPDES 005 (NPDESS). This sediment pond is located in the north mining <br />area on a tributary to Dry Creek referred to as the 005 Gulch. <br />Constructio n of this pond w as completed in July 1992 and the first <br />discharge occurred on April 22, 1993. This pond was dredged in the <br />summers of 1998 and 2001. The water year average flows values since this <br />pond began to discharge are: <br />2002 0.016 cfs (monthly measurements) <br />2001 0.018 cfs " <br />2000 0.024 cfs (from monthly measurements as of 12/99) <br />1999 0.057 cfs (weekly measurements) <br />1998 0.110 cfs " <br />1997 0.033 cfs " <br />1996 0.015 cfs " <br />1995 0.015 cfs " <br />1994 no flow (very low snowpack runoff this year) <br />1993 0.114 cfs (pond was dewatered to repair a leaking <br /> dewatering line) <br />15 <br />