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- NPDES 005 (NPDES5) This sediment <br />ond is located in the north minin <br /> g <br />p <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 2001. The water year average flows values since this <br />pond began to discharge are: <br />2007 0.038 cfs (monthly measurements) <br />2006 0.038 cfs (monthly measurements) <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 <br />1996 0.033 cfs <br />015 cfs <br />0 " <br /> . <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 3% below the historic (1993-2007) <br />average flow value, 0.039 cfs. This year, flow was observed only in <br />March, April and May. Review of this site's TDS plot indicates a <br />decreasing trend. Baseline data for this site (WSD8) has been provided <br />in Appendix E 1. <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 II-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 1600 mg/1 was observed this year. <br />16 <br />