Laserfiche WebLink
<br />- NPDES 006 (NPDES6). This si te is located on a tributary to Hubberson <br />Gulch referred to as the 006 Gulch. Construction of the 006 Pond was <br />completed October 1 989. This pond collects all mine discharges from the <br />central mining area. The first hydrograph supplied shows data for this <br />year; the second shows all data collected since the site began <br />discharging. Review of the flow hydrographs indicates typical seasonal <br />variation due to snowmelt runoff in the spring, with additional peaks <br />due to pit pumpage, pond clean -out, and rainfall events. The water year <br />average flow values since this pond began to discharge are: <br />2008 0.446 cfs (monthly measurements) <br />2007 0.164 cfs (monthly measurements) <br />2006 0.185 cfs (monthly measurements) <br />2005 0.117 cfs (monthly measurements) <br />2004 0.509 cfs (monthly measurements) <br />2003 0.198 cfs (monthly measurements) <br />2002 0.186 cfs " <br />2001 0.080 cfs 0 <br />2000 0.099 cfs (from monthly measurements as of 12/99) <br />1999 0.184 cfs (weekly measurements) <br />1998 0.317 cfs " <br />1997 0.343 cfs <br />1996 0.144 cfs <br />1995 0.106 cfs <br />1994 0.010 cfs <br />1993 0.127 cfs " <br />1992 0.036 cfs " <br />1991 0.062 cfs <br />1990 0.055 cfs (pond did not completely fill until March <br /> 29, 1990). <br />This year's average flow value is 117% above the historic average flow <br />value, 0.161 cfs. <br />Flow values for this pond have been affected by a 3.4 foot increase in <br />spillway elevation on July 31, 1991, the installation of a 4 inch <br />orifice on the riser pipe on November 2, 1995, and the dredging of this <br />14