Laserfiche WebLink
4. On Page 2-2 of the Annual Hydrology Report the description of surface water <br />sampling location Upper West Fork of Good Spring Creek (UWFGSC) states <br />that sampling began in 2007. While the sampling did begin in the fourth <br />quarter of 2007 the statement that it started in "2007" may lead to some <br />confusion regarding the "missing" data for the first three quarters of the year. <br />Please change this description to state that sampling of UWFGSC began in <br />the fourth quarter of 2007. <br />Colowyo has changed the description on page 2-2 of the 2009 Annual <br />Hydrology Report to reflect this comment and has attached replacement pages <br />to this letter for the Division to incorporate into its copy of Colowyo's 2009 <br />AH R. <br />5. As state in the "spoil springs" section above, numerous small spoil springs <br />has developed at the Colowyo Mine in the Streeter and Gulch A watersheds. <br />_ _P/ease -add -a discussion of-these -spoil springs -to---the -text-portion-of _the_ - - <br />Annual Hydrology Report starting with the 2010 report. <br />As stated in the Mid Term Review comments submitted to the Division on 9 <br />July 2010, Colowyo has no issue with adding a discussion of spoil springs to <br />the Annual Hydrology Report starting with the 2010 report. This text will <br />specifically state that a limited number of low impact spoil springs are <br />expected to develop occasionally, but the their aerial extent and low level or <br />non-existent surface flow will have a very minor impact on surface (and <br />shallow groundwater/perched aquifer) water quality and quantity in the future. <br />6. Pursuant to Rule 4.05.13(4)(c)(iii), please provide a written interpretation of <br />the water monitoring data contained in the Annual Hydrology Report and <br />identify the mining related impacts, if any. Please discuss how this data <br />confirms or refutes the probable hydrologic impacts discussed in the permit. <br />This written interpretation needs to begin with the 2010 Annual Hydrology <br />Report. <br />Pursuant to Rule 4.05.13(4)(c)(iii), Colowyo will comply with this request for <br />a written interpretation of the water monitoring data, starting with the 2010 <br />Annual Hydrology Report. <br />If you have any questions or require additional information, please feel free to <br />contact me at (970) 824-1529. <br />S' cerely, <br />e4 <br />nnifer Sekulski-Barton <br />Environmental Engineer <br />Encl. 2 copies of replacement pages for 2009 AHR <br />Cc: file CF 17.4 <br />Colowyo Coal Company • 5731 State Highway 13 • Meeker, CO 81641 <br />T+ 1 970 824 1529 • F+ 1 970 824 1598 • http://prospect.riotinto.org/irj/portal