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• <br />• <br />• <br />1994 0.010 cfs " <br />1993 0.127 cfs " <br />1992 0.036 cfs " <br />1991 0.062 cfs " <br />1990 0.055 cfs (pond did not completely fill until March <br />29, 1990). <br />This year's average flow value is 5% above the historic (1990-2007) <br />average flow value, 0.156 cfs. <br />Flow values for this pond have been affected by a 3.4 foot increase in <br />spillway elevation on July 31, 1991, the installation of a 4 inch <br />orifice on the riser pipe on November 2, 1995, and the dredging of this <br />pond that occurred in the summer of 1996 and the fall of 1997. An <br />upstream presettling pond was added in March 1998. The principle <br />spillway elevation was changed again, and the dewatering orifice <br />removed, in August 1998. In August 2003, an 18-inch riser pipe was <br />installed on the discharge culvert, and the presettling pond was <br />removed. Additional dredging (and dewatering) occurred in the fall of <br />2004. Also affecting discharges from this pond are the pumping of water <br />from this pond for water trucks and the pumping of water into this pond <br />from the mine water supply well (WTC201). <br />Review of the TDS plot indicates an increasing trend due to runoff from <br />mine spoils. Baseline data for this site (WSH6) has been provided in <br />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 ditches were established adjacent <br />this site in July 1999. The TDS plot indicates an increasing trend. <br />Baseline water quality statistics have been provided in Appendix E1. The <br />Seneca II-W PHC, Table 17-42b, predicts an irrigation season (June- <br />September) average TDS value of 2527 mg/1 for this site, while a value <br />of 2325 mg/1 was observed this year. <br />15 <br />