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At the surface water monitoring station on Grassy Creek below Seneca II Mine <br />(S W-S2-2), the quantity and quality of water exiting the mine is monitored. The <br />June through September mean flow for the period of record is 0.83 cfs, with <br />minimum of 0 cfs and maximum of 10.06 cfs. A June through September mean <br />concentration of TDS (2,695 mg/1) has been observed at this site in 1987. A mean <br />June through September concentration of TDS (3,748 mg/1) was observed at this <br />site in 2002. The 2002 value was observed in a drought yeaz which may reflect <br />higher than normal TDS concentrations. <br />Fish Creek Drainage Basin <br />Cow Camp Creek <br />Since 1982, surface water flow and quality on Cow Camp Creek have been <br />monitored at site SW-52-6, 1/4 mile downstream of Pond 004, and at the outfall of <br />Pond 004. Flow rates measured at the 004 outfall and at SW-S2-6 aze directly <br />related. In 1983 the yeazly average flow was 0.154 cfs at site SW-52-6. This site is <br />no longer part of the monitoring network and was discontinued in June, 1997. At <br />Pond 004 in 2002 the yeazly average flow was 0.93 cfs. <br />Prior to mining disturbance in the Cow Camp Creek drainage, the creek was <br />ephemeral. Pit disturbance in the drainage has resulted in perennial flow at <br />SW-S2-6, with a yeaz round average of 0.481 cfs (up until the time that monitoring <br />was discontinued at this location). <br />Total dissolved solids in Cow Camp Creek have escalated as mining in the drainage <br />azea has progressed. TDS has increased from an average of 600 mg/1 in 1982 at S W- <br />52-6 to an average of 3,991mg/1 in 2002 at Pond 004. Concentrations of sulfate, <br />calcium, and magnesium have increased in similaz proportion, while sodium and <br />bicazbonate concentrations have decreased. <br />Bond Creek <br />Mining in the Bond Creek drainage began in 1488. Data obtained at the outfall of <br />Pond 008 show an increase in flows in Bond Creek over the last nine yeazs. Mean <br />annual flow in 1987 was .028 cfs, and in 2002 was 0.083 cfs. Concentrations of <br />total dissolved solids have increased steadily during the past eleven yeazs, from <br />1,367 mgll in 1991 to 2,838 mgll in 2002. <br />Fish Creek is monitored at site SW-S2-13, downstream of the confluences of Bond <br />Creek and Cow Camp Creek with Fish Creek. Data from the site does not show any <br />identifiable change in water quality or quantity when compared with Fish Creek site <br />SW-S2-11, upstream of Bond Creek and Cow Camp Creek. <br />23 <br />