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2002 0.186 cfs <br />2001 0.080 cfs " <br />2000 0.099 cfs (from monthly measurements as of 12/99) <br />1999 0.184 cfs (weekly measurements) <br />1998 0.317 cfs " <br />1997 0.343 cfs " <br />1996 0.144 cfs " <br />1995 0.106 cfs " <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 years average flow value is 326 of the historic (1990-2004) <br />average flow value, 0.156 cfs. The reason for the high average was due <br />to high August and September flow values that were measured while pond <br />pumping was in progress. The pond was being pumped to lower the water <br />level while it was being dredged. <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 1995. 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. Also affecting discharges from this pond are the pumping of <br />water from this pond for water trucks and the pumping of water into this <br />pond 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 El. . <br />16 <br />