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June to September), each of which are further divided into two general categories of sampling frequency: 1) <br />"Regular" monitoring that is done continuously, and 2) "Contingent" monitoring that is conducted only when <br />there is a discharge from underground mine pumping at surface discharge sites 109 and/or 115, which did not <br />occur in 2015. Note that discharge from site 109 has not occurred in about 20 years, and is not anticipated to <br />occur in the future. <br />2015 surface water data is provided in Tables 33 through 49. Water quality parameters for these sites were <br />typically within previously established ranges, unless otherwise discussed below. An historical summary of data <br />has been provided in Tables 35a through 51a. <br />Stream Gating <br />Accurately monitoring flow at stream sites can be difficult due to continual damage of gage stations by cows, <br />horses, flooding, and various weather effects. Stations require repair on a regular basis. 2015 was no different. <br />Snow melt and creek flooding in 2015 washed out many gage stations. Some gages were repaired in 2013 and <br />2015. Continuing erosion of stream channel banks impact flow calculations. In the summer of 2007, TC hired <br />consultants (Rivers Unlimited, Inc. of Steamboat Springs, and Norwest Applied Hydrology of Denver) to assist <br />with re-evaluating key stream bed locations, including rating curves for ongoing stream gauging. This on-going <br />study continued into the spring, summer and fall of 2015. Gage calculations data from the consultant are <br />included in the attached tables per each site. <br />In 2008 through 2015 the consultants assisted with the temporary repair of some gage stations, however the <br />accuracy of some of the gage readings were sometimes suspect. Gage calculations by Rivers Unlimited for 2015 <br />should be viewed as being more accurate than field gage readings. In 2012, four protective enclosures were <br />constructed by Rivers Unlimited at historic flow meter recorder locations. New recorders were installed and <br />activated in May of 2012 at these sites. The meter locations include sites 16A, downstream of 8, 1003, and site <br />69. <br />Additional gage station protective steel enclosures were constructed in 2015 at several monitoring sites. Four <br />new flow meters were installed at these sites in 2015, these included sites 900, 29, 1005 and 301. <br />Foidel Creek: 2015 was a good water year. Four surface flow monitoring sites on Foidel Creek (in the vicinity of <br />the TC mine portals and facilities areas) are utilized. Site 800 and site 14 are located upstream of the portal. Site <br />8 is located off the TC facility, downstream of Pond G. It is TC's intent to present a minor revision in 2015 to <br />relocate site 8 further downstream to an area that is easier to access, and which would also be downstream of <br />potential discharge from a future mine dewatering site. Site 900 is located further downstream on Foidel above <br />the confluence with Middle Creek. Former site 304 was located further downstream of 900. Site 304 was <br />eliminated in 2003 per TR03-42. <br />Tables 33 through 36 provide summaries of the 2015 Water Year data collected at each site. Tables 33a, 34a, and <br />35a provide POR statistical summaries of collected data at each site. Figures 52 to 59 and 102 to 105 provide <br />graphical representations of water levels and selected water quality parameters recorded at each site. Typical <br />11 <br />