Laserfiche WebLink
20. Response Not Accepted. In their response Colowyo states that the post-mining <br />topography has been changed with this submittal and that the limits of the East Taylor <br />Fill ditches have been extended. While the Division agrees that this is the case, the <br />topography has not been changed to address the large, flat area on the upper (south) <br />portion of the East Taylor Fill that encompasses approximately 110 acres. It is still not <br />clear how water will be diverted off of the fill in this location and into a designed ditch. <br />All runoff from the fill must comply with Rule 4.09.1(7), which states that "...excess <br />spoil shall be... graded to allow surface and subsurface drainage to be compatible with <br />the natural surroundings..." and Rule 4.09.2(5), which states "(d)rainage shall not be <br />directed over the outslope of the fill." The current design of the East Taylor Fill does not <br />meet these requirements for surface water runoff. Pursuant to Rules 4.09.1(7) and <br />4.09.2(5), please describe how Colowyo plans to divert the runoff from the large, flat <br />area of the East Taylor Fill into stabilized ditches which will safely pass the 100- <br />year, 24-hour storm event. Please include this description in the text under Rule <br />4.09 - Disposal of Excess Spoil, which begins on Page 20 (South Taylor/Lower <br />Wilson-Rule 4, Page 20) in Volume 12. <br />21. Response Not Accepted. In their response Colowyo states that the post-mining <br />topography has been changed with this submittal and that the limits of the West Taylor <br />Fill ditches have been extended. While the Division agrees that this is the case, the <br />topography has not been changed to address the large, flat area on the upper (south) <br />portion of the West Taylor Fill that encompasses approximately 70 acres. It is still not <br />clear how water will be diverted off of the fill in this location and into a designed ditch. <br />All runoff from the fill must comply with Rule 4.09.1(7), which states that "...excess <br />spoil shall be... graded to allow surface and subsurface drainage to be compatible with <br />the natural surroundings..." and Rule 4.09.2(5), which states "(d)rainage shall not be <br />directed over the outslope of the fill." The current design of the West Taylor Fill does <br />not meet these requirements for surface water runoff. Pursuant to Rules 4.09.1(7) and <br />4.09.2(5), please describe how Colowyo plans to divert the runoff from the large, flat <br />area of the West Taylor Fill into stabilized ditches which will safely pass the 100- <br />year, 24-hour storm event. Please include this description in the text under Rule <br />4.09 - Disposal of Excess Spoil, which begins on Page 20 (South Taylor/Lower <br />Wilson-Rule 4, Page 20) in Volume 12. <br />22. Response Not Accepted. The following is the Division's original adequacy question for <br />question for your reference (please note that two additional questions have been asked in <br />the following paragraph, based on the Division's third and fourth comments, as a result of <br />the new designs submitted): Colowyo has provided a new Map 45 - South Taylor Fill, <br />which shows the East Taylor and West Taylor Fill plans and cross-sections. This plan <br />view information (less the cross-section details) for the East Taylor and West Taylor Fills <br />is also shown on Exhibit 7, Item 20, Figures 1 C-4 and 1 C-5 - West Taylor Pond <br />Drainage and Figure 1 of the Shannon and Wilson report. There are, however, two <br />discrepancies between Map 45 and Figures 1 C-4 and 1 C-5 and Figure 1 of the Shannon <br />and Wilson report with regards to the plan view for the East Taylor Fill. First, the <br />configuration of the topography lines of the temporary overburden stockpile on the East <br />Taylor Fill is different in the figures as compared to the map. The northwest corner of .