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2003 <br />0.198 <br />cfs <br />(monthly measurements) <br />2002 <br />0.186 <br />cfs <br />(monthly measurements) <br />2001 <br />0.080 <br />cfs <br />(monthly measurements) <br />2000 <br />0.099 <br />cfs <br />(from monthly measurements as of 12/99) <br />1999 <br />0.184 <br />cfs <br />(weekly measurements) <br />1998 <br />0.317 <br />cfs <br />" <br />1997 <br />0.343 <br />cfs <br />1996 <br />0.144 <br />cfs <br />1995 <br />0.106 <br />cfs <br />" <br />1994 <br />0.010 <br />cfs <br />" <br />1993 <br />0.127 <br />cfs <br />" <br />1992 <br />0.036 <br />cfs <br />" <br />1991 <br />0.062 <br />cfs <br />" <br />1990 <br />0.055 <br />cfs <br />(pond did not completely fill until March <br />29, 1990). <br />This year's average flow value, 0.140 cfs, is below the historic (1990- <br />2017) average flow, 0.170 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 the 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). Review of <br />the TDS plot indicates an increasing trend. Baseline data for this site <br />(WSH6) has been provided in Appendix Elof the 2010 AHR. <br />16 <br />