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- NPDES 016 (NPDESI6). This site exists on a Hubberson Gulch tributary <br />in the II -W South area. Pond 016 was nearly complete in September 2000, <br />and first discharged in April 2001. It is now monitored monthly. Average <br />flow values for each water year are: <br />2012 <br />0.045 <br />cfs <br />(monthly <br />measurements) <br />2011 <br />0.317 <br />cfs <br />(monthly <br />measurements) <br />2010 <br />0.104 <br />cfs <br />(monthly <br />measurements) <br />2009 <br />0.102 <br />cfs <br />(monthly <br />measurements) <br />2006 <br />0.141 <br />cfs <br />(monthly <br />measurements) <br />2007 <br />0.081 <br />cfs <br />(weekly measurements) <br />2006 <br />0.103 <br />cfs <br />" <br />2005 <br />0.044 <br />cfs <br />" <br />2004 <br />0.037 <br />cfs <br />" <br />2003 <br />0.090 <br />cfs <br />" <br />2002 <br />0.037 <br />cfs <br />" <br />2001 <br />0.019 <br />cfs <br />fr <br />This year's average flow was 42% below than the average historic (2001- <br />2011) flow, 0.078 cfs. The timing of when flow values are collected <br />affects these averages. Mine pit pumping into this pond was responsible <br />for many of the high peaks present on the hydrograph in previous years. <br />An upper pond, 016A, was constructed in 2004. The discharge culvert for <br />Pond 016A failed in April 2011. It was not repaired, and the pond was <br />removed later in 2011. The TDS trend at this site is decreasing, with <br />the peak occurring in August 2005. Baseline data from Site SW- S2W -SG16 <br />(WSH16) has been provided in Appendix E1 of the 2010 AHR. <br />- 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 />12 <br />