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No flow was observed at this site this year. Average historic flow is <br />0.053 cfs. Review of this site's TDS plot indicates a decreasing trend. <br />Baseline data for this site (WSS3) has been provided in Appendix E1. <br />- Surface Water Site SW-S2W-FG4 (WSSF3). This site is situated on Sage <br />Creek downstream of the impacts from the Seneca II-W Mine (NPDES 009 and <br />015). Monitoring of this site commenced in September 1990. This site <br />displays an increasing TDS trend. Baseline data for this site has been <br />provided in Appendix E1. <br />The Seneca II-W PHC, Table 17-42b, predicts an irrigation season (June- <br />September) average TDS value of 676 mg/1 on Sage Creek, while a value of <br />815 mg/1 was observed this year. The value observed this year was only <br />139 mg/1 greater than the predicted value. However, the maximum TDS <br />value observed during the same time frame at NPDES 015 and NPDES 009 was <br />only 450 mg/1. It should be noted that the PHC predictions were based <br />data from 1982 to 1989, when Site WSSF3 had an average flow of 1.18 cfs <br />in June thru September. However, this year, Site WSSF3 had an average <br />flow of only 0.21 cfs in June thru September. Since there was less <br />dilution water, TDS values were higher than predicted this year. <br />Springs. Spring data may be found after surface water data in Appendix <br />E. Data provided are a water quality report for the past two years, <br />historic flow measurements and remarks, a LOWESS plot of TDS or <br />electrical conductivities (EC, corrected to 25° C, since 10/1/89), and a <br />historic listing of percent milliequivalents of major ions and TDS. <br />Baseline water quality statistics for springs downstream of mining (when <br />available) has been provided in Appendix E1. Springs with a flow less <br />than 5 gpm (0.011 cfs) are analyzed for field parameters only. In <br />Appendix E, all native springs have a WSPG prefix (e.g., Spring 5-45 = <br />WSPG45) while all spoil springs have a WSSPG prefix. <br />Spring 5-23 is located at the headwaters of the 006 Gulch, in an <br />ephemeral stream channel. This spring is upstream of mining and should <br />not be affected by mining. The EC plot indicated a stable trend since <br />1997. <br />I~ <br />