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Twentymile Park. Dissolved solids from mine discharges are diluted <br />during the snowmelt runoff in March and April (prior to the irrigation <br />season) by high stream flows with relatively low TDS concentrations. <br />The natural conditions in Twentymile Park appear to have a much greater <br />impact on the water quality of Fish Creek. <br />Little Grassy Creek Drainage. Two monitoring sites lie within the <br />Little Grassy Creek drainage: Site 5, located in the southwest portion <br />of the permit area and NPDES Discharge Point 002, also known as the <br />Wadge Impoundment. <br />- Surface Water Site SW-S2-5 (SSLG5). Site 5 drains the upper reaches <br />of Little Grassy Creek which are undisturbed by mining. A comparison of <br />its hydrograph to that of NPDES 002 indicates that Site 5 is a <br />relatively minor contributor to the flow in this basin. <br /> - NPDES Discharge Point 002 (NPDES2). Hydrographs are presented in <br /> Appendix D. The hydrographs consist of two pages, the first is for data <br /> this year, and the second shows all historical data. The following <br /> table lists the average flow values for each water year. <br /> 2007 = 1.112 cfs (monthly measurements) <br /> 2007 = 0.514 cfs <br /> 2006 = 0.997 cfs " <br /> 2005 = 0.356 cfs " <br /> 2004 = 0.283 cfs " <br /> 2003 = 0.323 cfs " <br /> 2002 = 0.245 cfs " <br /> 2001 = 0.374 cfs " <br /> 2000 = 0.320 cfs " <br /> 1999 = 0.483 cfs (weekly measurements) <br /> 1998 = 1.209 cfs " <br /> 1997 = 1.242 cfs " <br /> 1996 = 1.400 cfs <br /> 1995 = 0.386 cfs " <br /> 1994 = 0.114 cfs <br /> 1993 = 0.602 cfs <br />13