2015-03-18_REPORT - C1982056 (4)

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dewatering site and is monitored in conjunction with alluvial well 006 -AZ -3. Site 302 is located approximately two miles downstream of the Fish Creek Borehole mine dewatering site. Site 305 is located upstream of the Fish Creek Tipple and is monitored in conjunction with alluvial well 008 -AU -3. Site 27A is located immediately upstream of the Fish Creek Tipple discharge (a.k.a. CDPS discharge site 62). Site 1003 is located downstream of the Fish Creek Tipple site 62. Monitoring requirements at sites 307 and 305 require monthly water level measurements (March through September), and semi - annual field parameters. However, per PR03 -06, site 305 now requires semi - annual water quality testing. Three relatively new surface sites were added in conjunction with the new Fish Creek Alluvium well sites (AVF - 13, AVF -14, and AVF -15), in order to evaluate potential subsidence impacts in the area. These are surface sites SW -13, SW -14 (both added in August 2001), and SW -15 (added in June 2002). These sites require quarterly water level measurements (March through September), and semi - annual field parameters and water quality sampling. 2011 saw Fish Creek go dry in August due to drought conditions. Tables 37 through 45 provide summaries of the 2014 Water Year data collected at Fish Creek surface flow sites. Tables 37a through 45a provide some historical summaries of collected data at each site for comparison. Figures 60 through 91 provide graphical representations of water levels and selected water quality parameters recorded at each site. Again, typical flow patterns were exhibited at these sites with spring runoff periods accounting for the peak flows observed. In general, an inverse relationship between flow and field conductivity was evident. 2006 water quality parameters for these sites were generally within previously established ranges. Fish Creek almost went dry briefly in late August 2014. Some surface sites (e.g. 1003) saw unusual short term spikes in conductivity and TDS in 2013. Some of this may be related to heavy precipitation and erosion. 2014 saw values return to historical values. 2014 saw some spring spikes in total recoverable iron concentrations (e.g. sites 27A and 1003). This may be related to erosion from rapid snow melt. TC will continue to monitor this. New surface sites SW -13, SW -14, and SW -15 (Tables 43 -45, Figures 66 -77) indicated elevated concentrations for total recoverable (TR) iron in early June 2003, however iron concentrations dropped dramatically (about an order of magnitude) by August 2003. With the exception of TR iron, none of the values recorded during the initial sampling episode fell outside the typical historical range of other surface sites on Fish Creek. In 2014 iron values ranged between 180 ug/L to a high of 1260 ug/L. This is typical for historical seasonal fluctuations, with spikes often seen during high runoff period, most likely relating to fresh erosion. Trout Creek: Trout Creek did not go dry in 2014. Three surface flow monitoring sites on Trout Creek are utilized. Site 301 is located on Trout Creek above the confluence with Middle Creek. Site 69 is located on Trout Creek below the confluence with Middle Creek. Site 1005 (established in 1994) is located downstream of the confluence with Fish Creek and is monitored in conjunction with alluvial well 008 -AT -1. Tables 46 through 48 provide summaries of the 2014 Water Year data collected at Trout Creek surface flow sites. Tables 46a and 48a provide historical summaries of collected data at sites 301, 69, and 1005. Figures 92 through 12