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Foidel Creek Mine C-82-056 2021 Annual Hydrology Report <br /> Stream Gaging <br /> Accurately monitoring flow at stream sites can be difficult due to continual damage to gage <br /> stations by cows, horses, flooding, and various weather effects. Stations require repair on a <br /> regular basis. TC attempts to make repairs as soon as possible. Continuing erosion of stream <br /> 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 <br /> locations, including rating curves for ongoing stream gauging. This study continued into the <br /> spring 2017 but due to costly expenditures TC resorted to performing stream gaging with in house <br /> staff for the remainder of 2017 and will continue for the foreseeable future. <br /> In 2012, four protective enclosures were constructed by Rivers Unlimited at historic flow meter <br /> recorder locations. New recorders were installed and activated in May of 2012 at these sites. <br /> The meter locations include sites 16A, downstream of 8, 1003, and site 69. Additional gage <br /> station protective steel enclosures were constructed in 2015 at several monitoring sites. Four new <br /> flow meters were installed at these sites in 2016, these included sites 900, 29, 1005 and 301. <br /> These meter locations are currently not in use due to the costly up-keep and calibration needed <br /> for them to properly function. <br /> Although precipitation during the 2021 report period was near normal, the precipitation during the <br /> 2020 report period was much less than normal and it would be expected that the stream flow <br /> during the 2021 report period would be somewhat less than normal as a result. <br /> Foidel Creek: <br /> Four monitoring sites are located within Foidel Creek. Site 800 and site 14 are located upstream <br /> of the portal, site 8 is located downstream of the TC portal and surface facilities, and site 900 is <br /> located further downstream above the confluence with Middle Creek. Former site 304 was <br /> eliminated in 2003 per TR03-42. <br /> Typical flow patterns were exhibited at these sites in 2021 with spring runoff accounting for the <br /> peak flows. An inverse relationship between flow and field conductivity continues to be evident at <br /> each of these sites. The water quality in 2021 remained within the historic ranges observed at <br /> these points. <br /> 22 <br />