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- 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 year. <br />~2001WY-(Water Year) = 0.374 cfs (monthly measurements) <br />2000WY = 0.320 cfs " <br />1999WY = 0.483 cfs (weekly measurements) <br />1998WY = 1.209 cfs " <br />1997WY = 1.242 cfs " <br />1996WY = 1.400 cfs _ " <br />1995WY = 0.386 cfs " <br />1994WY = 0.114 cfs - " <br />1993WY = 0.602 cfs ~" <br />1992WY = 0.072 cfs " <br />1991WY = 0.072 cfs ^ <br />- 1990WY- = 0.076 cfs " <br />1989WY = 0.181 cfs " <br />1988WY ~ = 0.055 cfs <br />=1987WY = 0.070 cfs " <br />1986WY = 0.568 cfs " <br />1985CY (Calendar Year) = 1.172 cfs " <br />1984CY = 1.439 cfs " <br />1983CY = 0.531 cfs " <br />1982CY = 0.547 cfs " <br />1981CY = 0.098 cfs <br />1980CY = 0.990 cfs " <br />This year's average flow value, 0.374 cfs, is 668 of the historic (1980- <br />2000) average flow value, 0.564 cfs. Flow values at this site are <br />affected by the pumping of water from this pond for the truck wash <br />system and for water trucks (dust control). Pumping for the truck wash <br />system began on September 18, 1984. Review of the TDS plot indicates an <br />increasing trend. <br /> <br /> <br />Grassy Creek Drainage. Four monitoring sites lie within the Grassy i <br />Creek drainage: Site 1, located upstream on Grassy Creek; NPDES <br />I6 <br />