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Site SW-S2W-SG16 (WSH16) have been provided in Appendix E1 of the 2010 <br />AHR. <br />Surface Water Site SW-S2W-SG7 (WSH7). <br />This site is located on Hubberson Gulch upstream of the confluence of <br />mine discharges contained in the 006 Gulch, but is downstream of Ponds <br />016 and 017. Monitoring here began in April 1987. Monitoring at this <br />site was suspended, as permitted in TR 69, in May 2010. It is now being <br />monitored as part of a CDPHE water quality assessment for total <br />recoverable iron. This site displays an increasing TDS trend; with the <br />peak value in September 2005. <br />NPDES 006 (NPDES6). <br />This site is located on a tributary to Hubberson Gulch referred to as <br />the 006 Gulch. Construction of the 006 Pond was completed October 1989. <br />This pond collects all mine discharges from the central mining area. The <br />first hydrograph supplied shows all data collected since the site began <br />discharging; the second shows data for this year. Review of the flow <br />hydrographs indicates typical seasonal variation due to snowmelt runoff <br />in the spring, with additional peaks due to pit pumpage, pond clean out, <br />and rainfall events. Average flow values for each water year are: <br />2017 <br />0.140 <br />cfs <br />(monthly <br />measurements) <br />2016 <br />0.139 <br />cfs <br />(monthly <br />measurements) <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 />15 <br />