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- NPDES 005 (NPDESS). This sediment pond is located in the north mining <br /> area on a tributary to Dry Creek referred to as the 005 Gulch. <br /> Construction of this pond was completed in July 1992 and the first <br /> discharge occurred on April 22, 1993. This pond was dredged in the <br /> summers of 1998 and 20 01. The water year average flows values since this <br /> pond began to discharg e are: <br /> 2005 0. 021 cfs (monthly measurements) <br /> 2004 0. 017 cfs (monthly measurements) <br /> 2003 0. 026 cfs (monthly measurements) <br /> 2002 0. 016 cfs " <br /> 2001 0. 018 cfs " <br /> 2000 0. 024 cfs (from monthly measurements as of 12/99) <br /> 1999 0. 057 cfs (weekly measurements) <br /> 1998 0. 110 cfs " <br /> 1997 0. 033 cfs ^ <br /> 1996 0. 015 cfs " <br /> 1995 ~ 0. 015 cfs ^ <br /> 1994 no flow (very low snowpack runoff this year) <br /> 1993 0. 114 cfs {pond was dewatered to repair a leaking <br /> dewatering line) <br /> This year's average flow value is 54$ of the historic (1993-2005) <br /> average flow value, 0 .039 cfs. This year, flow was observed only in <br /> April, May and June. Review of this site's TDS plot indicates a <br /> decreasing trend. Base line data for this site (WSDS) has been provided <br /> in Appendix E1. <br />- Surface Water Site SW-S2W-SG5 (WSDS). This site is located on Dry <br />Creek and is the furthest downstream surface water site for this side of <br />Seneca ZI-W. Monitoring at this site began in March 1983. The TDS plot <br />indicates an increasing trend. The peak TDS value occurred in September <br />2003. The Seneca II-W PHC, Table 17-42b, predicts and average irrigation <br />season (June-September) TDS value of 2451 mg/1 at this site, while a <br />value of 1655 mg/1 was observed this year. <br />• <br />]7 <br />