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- Surface Water Site SW-S2W-SG7 (WSH7). This site is located on <br />Hubberson Gulch upstream of the confluence of mine discharges contained <br />in the 006 Gulch, but is downstream of Ponds 016 and 017. Monitoring <br />here began in April 1987. Monitoring at this site was temporarily <br />suspended, as permitted in TR 69, in May 2010. It is now being monitored <br />as part of a CDPHE water quality assessment for total recoverable iron. <br />This site displays an increasing TDS trend; however, the peak value <br />occurred in September 2005. <br />- NPDES 006 (NPDES6). This site is located on a tributary to Hubberson <br />Gulch referred to as the 006 Gulch. Construction of the 006 Pond was <br />completed October 1989. This pond collects all mine discharges from the <br />central mining area. The first hydrograph supplied shows all data <br />collected since the site began discharging; the second shows data for <br />this year. 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. Average flow <br />values for each water year are: <br />2015 <br />0.149 <br />cfs <br />(monthly <br />measurements) <br />2014 <br />0.182 <br />cfs <br />(monthly <br />measurements) <br />2013 <br />0.168 <br />cfs <br />(monthly <br />measurements) <br />2012 <br />0.101 <br />cfs <br />(monthly <br />measurements) <br />2011 <br />0.571 <br />cfs <br />(monthly <br />measurements) <br />2010 <br />0.196 <br />cfs <br />(monthly <br />measurements) <br />2009 <br />0.215 <br />cfs <br />(monthly <br />measurements) <br />2008 <br />0.446 <br />cfs <br />(monthly <br />measurements) <br />2007 <br />0.164 <br />cfs <br />(monthly <br />measurements) <br />2006 <br />0.185 <br />cfs <br />(monthly <br />measurements) <br />2005 <br />0.117 <br />cfs <br />(monthly <br />measurements) <br />2004 <br />0.509 <br />cfs <br />(monthly <br />measurements) <br />2003 <br />0.198 <br />cfs <br />(monthly <br />measurements) <br />2002 <br />0.186 <br />cfs <br />(monthly <br />measurements) <br />2001 <br />0.080 <br />cfs <br />(monthly <br />measurements) <br />2000 <br />0.099 <br />cfs <br />(from monthly <br />measurements as of 12/99) <br />15 <br />