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This year's average flow value is 4316 below the historic (1990 -2012) <br />average flow value, 0.296 cfs. The timing of when flow values are <br />collected affects these averages. Flow values for this pond have been <br />affected by a 3.4 foot increase in spillway elevation on July 31, 1991, <br />the installation of a 4 inch orifice on the riser pipe on November 2, <br />1995, and the dredging of this pond that occurred in the summer of 1996 <br />and the fall of 1997. An upstream pre - settling pond was added in March <br />1998. The principle spillway elevation was changed again, and the <br />dewatering orifice removed, in August 1998. In August 2003, an 18 -inch <br />riser pipe was installed on the discharge culvert, and the presettling <br />pond was removed. Additional dredging (and dewatering) occurred in the <br />fall of 2004. Also affecting discharges from this pond was the pumping <br />of water from this pond for water trucks (last significant amounts were <br />in 2007) and the pumping of water into this pond from the mine water <br />supply well, WTC201 (last significant amounts were in 2000). <br />Review of the TDS plot indicates an increasing trend. Baseline data for <br />this site (WSH6) has been provided in Appendix Elof the 2010 AHR. <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, with <br />the peak TDS value occurring this year in August of 2013. Baseline water <br />quality statistics have been provided in Appendix E1 of the 2010 AHR. <br />- NPDES 005 (NPDES5). This sediment pond is located in the north mining <br />area on a tributary to Dry Creek referred to as the 005 Gulch. Mining in <br />this basin started in November 1992. Construction of this pond was <br />completed in July 1992 and the first discharge occurred on April 22, <br />1993. This pond was dredged in the summers of 1998 and 2001. The water <br />year average flows values since this pond began to discharge are: <br />2013 <br />0.044 <br />cfs <br />(monthly <br />measurements) <br />2012 <br />0.003 <br />cfs <br />(monthly <br />measurements) <br />2011 <br />0.214 <br />cfs <br />(monthly <br />measurements) <br />2010 <br />0.018 <br />cfs <br />(monthly <br />measurements) <br />14 <br />