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Page 6 of 6 <br />of mining in the WMD will result in this well falling within the mining area, adequate <br />information exists to reasonably assess potential mining - related hydrologic impacts. <br />In addition, the subject alluvial well is located over a gate -road area, and as a result, <br />should not be significantly affected by subsidence. TC has a number of alluvial wells <br />which fall within active mining areas, some of which fall within areas which have been <br />subsided. Historically, these wells have continued to function as viable monitoring <br />points, with ongoing monitoring providing valuable information on any changes in <br />groundwater levels and quality within the associated alluvial groundwater system(s). <br />Division Response: This response is adequate. It is noted that the period of record data <br />for the life of the well will continue to be required in the Annual Hydrology Reports <br />submitted by TC to the Division for compliance with 4.24.3(2), (3), and 4.24(1)(c). If <br />Well 006 -AY -1 is found to be affected by subsidence in a manner that prohibits <br />monitoring of the alluvial valley floor. A replacement well may be required. <br />Please feel free to contact me with any questions at (303) 866 -3567 ext 8134. <br />Sincerely, <br />Jason Musick <br />Environmental Protection Specialist <br />