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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 <br />1989. This pond collects all mine discharges from the <br />central mining area. The <br />first hydrograph supplied shows all data <br />collected since the site <br />began discharging; the second shows data for <br />this year. <br />Review of the <br />flow hydrographs indicates typical seasonal <br />variation due to snowmelt <br />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 <br />each water year <br />are: <br />2013 <br />0.168 <br />cfs <br />(monthly measurements) <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 />" <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 />" <br />1991 <br />0.062 <br />cfs <br />" <br />1990 <br />0.055 <br />cfs <br />(pond did not completely fill until March <br />29, 1990). <br />13 <br />