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- NPDES 006 <br />(NPDES6). This site is located on a tributary to Hubberson <br />Gulch referred to as the <br />006 <br />Gulch. Construction of the 006 Pond was <br />completed October 1989. This <br />pond collects all mine discharges from the <br />central mining area. The <br />first <br />hydrograph supplied shows data for this <br />year; the <br />second shows <br />all <br />data collected since the site began <br />discharging. <br />Review of the flow hydrographs indicates typical seasonal <br />variation due to snowmelt runoff in the spring, with additional peaks <br />due to pit <br />pumpage, pond <br />clean -out, and rainfall events. Average flow <br />values for each water year are: <br />2012 <br />0.101 <br />cfs <br />(monthly measurements) <br />2011 <br />0.571 <br />cfs <br />(monthly measurements) <br />2010 <br />0.196 <br />cfs <br />(monthly measurements) <br />2009 <br />0.215 <br />cfs <br />(monthly measurements) <br />2008 <br />0.446 <br />cfs <br />(monthly measurements) <br />2007 <br />0.164 <br />cfs <br />(monthly measurements) <br />2006 <br />0.185 <br />cfs <br />(monthly measurements) <br />2005 <br />0.117 <br />cfs <br />(monthly measurements) <br />2004 <br />0.509 <br />cfs <br />(monthly measurements) <br />2003 <br />0.198 <br />cfs <br />(monthly measurements) <br />2002 <br />0.186 <br />cfs <br />(monthly measurements) <br />2001 <br />0.080 <br />cfs <br />(monthly measurements) <br />2000 <br />0.099 <br />cfs <br />(from monthly measurements as of 12/99) <br />1999 <br />0.184 <br />cfs <br />(weekly measurements) <br />1998 <br />0.317 <br />cfs <br />1997 <br />0.343 <br />cfs <br />" <br />1996 <br />0.144 <br />cfs <br />" <br />1995 <br />0.106 <br />cfs <br />" <br />1994 <br />0.010 <br />cfs <br />" <br />1993 <br />0.127 <br />cfs <br />" <br />1992 <br />0.036 <br />cfs <br />IF <br />1991 <br />0.062 <br />cfs <br />FF <br />1990 <br />0.055 <br />cfs (pond <br />did not completely fill until March <br />29, 1990). <br />This year's average flow value is 41% below the historic (1990 -2011) <br />average flow value, 0.170 cfs. The timing of when flow values are <br />13 <br />