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unusually warm weather. Flow values for this pond have been affected by <br />a 3.4 foot increase in spillway elevation on July 31, 1991, the <br />installation of a 4 inch orifice on the riser pipe on November 2, 1995, <br />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. In August 2003, an 18-inch riser pipe <br />was installed on the discharge culvert. Also affecting discharges from <br />this pond are the pumping of water from this pond for water trucks and <br />the 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 E1. <br />- Surface Water Site SW-S2W-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 di tches were established adjacent <br />this 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 predic ts an irrigation season (June- September) average TDS value of <br />2193 mg/1 for this site, while a value of 1480 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 was 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 sinc e this <br />pond began to discharge are: <br />2003 0. 026 cfs (monthly measurements) <br />2002 0. 016 cfs <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 />l6 <br />