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3.3 Surface Water Monitoring <br />li I <br />Monitoring/Sampling Requirements: Table 32 presents a summaiy of surface water monitoring frequencies, <br />which was last updated for Pen -nit Revision 6 (PR 03-06 Exhibits 14-7 through 14-10) in March of 2004. Site <br />locations are shown on Figure 2 , Hydrologic Monitoring Plan of TR03-42 (as well as in Figure 2 of this AHR). <br />Table A of Exhibit 14 specifies three seasonal monitoring episodes (i.e. October to February, March to May, and <br />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 2016. Note that discharge from site 109 has not occurred in about 20 years, and is not anticipated to <br />occur in the future. <br />2016 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 Gaging <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. 2016 was no different. <br />Snow melt and creek flooding in 2016 damaged some gage stations. These were repaired in 2016. Continuing <br />erosion of stream channel banks impact accurate flow calculations. In the summer of 2007, TC hired consultants <br />(Rivers Unlimited, Inc. of Steamboat Springs) to assist with re-evaluating key stream bed locations, including <br />rating curves for ongoing stream gauging. This on-going study continued into the spring, summer and fall of <br />2016. Gage calculations data from the consultant are included in the attached tables per each site. <br />In 2008 through 2016 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 />and 2016 should be viewed as being more ac(urate than field gage readings. In 2012, four protective enclosures <br />were 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 2016, these included sites 900, 29, 1005 and 30U Additional flow <br />meters may be considered n 2017. <br />Foidel Cr -eek: 2016 was a goo water year. Four surface flow monitong sites on Foidel Creek (in the vicinity of <br />the TC mine portals and facilities areas) are utilized. Site 800 and sit'�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 2016 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 />11 <br />