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• miaiag area. The first hydrograDh supplied shows data £or this year; the second <br />shoes all flats collecte8 since the Bite began 8lecharging. Review of the flow <br />hydrographs indicates typical seasonal variatloa due to saowmelt runoff in the <br />sDriag, with additional Deaka due to pit Dumpage, pond clean-vut, and rainfall <br />events. The water year average flow values eiace this pond began to discharge <br />are: <br />2000 0.099 cfe (£rom monthly measurements ae of 12/99) <br />1999 0.186 cfe (weekly meaeuremeate) <br />1998 0.317 cfs ° <br />1997 0.343 cfe " <br />1996 0.144 cfe " <br />1995 0.106 cfe " <br />1994 0.010 cfe ° <br />1993 0.127 cfe <br />1992 0.036 cfe " <br />1991 0.062 efa " <br />1990 0.055 cfe (pond di8 sot completely fill until Marsh 29, 1990). <br />• The above table indicates the lowest average floor since 1994 occurra8 ehie year. <br />Flow values for this Dona have been affected by a 3.4 foot increase is spillway <br />elevation on July 31, 1991, the installation of a 4-inch ori£iee oa the riser <br />pipe on November 2, 1995, sad eha dredging of this Dond that occurred Sa the <br />summer of 1996 end the fall of 1997. An upstream Dreaettliag Doad mac sdded is <br />March 1998. The priacipla epillaay alavatioa mac changed again, and the <br />dematering orifice removed, in huguet 1998. L1eo affecting discharges from this <br />Doad are the pumping oP mater from this pond for water trueka and the Dumping of <br />aster Sato this Doad from the mine mater supply mall (WTC201). Revisor of the <br />TDS Dlot indicates en iacrensiag tread due to runoff from mina spoils. Baseline <br />data for this sits (W886) has been provided suet yrior to the TDS Dlot. <br />- Surface Water 91te 8W-32W-FG11 (WSNF1). This site ie located oa Hubbersoa <br />Gulch downstream of the 006 Gulch confluence. It Lae been monitored eiace July <br />1979. The peak flow this year was the lowest eiace 1994. Tha TDS plot indicates <br />a dearly level trend. The Seneca II-W PHC predicts as irrigation season (JuIIe- <br />• September) average TDS value of 2193 mg/1 for this vita, while a value of 1450 <br />mg/1 was observed this year. <br />13 <br />