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modeling for the East Taylor Pond to incorporate changes to the drainage areas and <br />ditches in the watershed that reports to the pond. <br />Response: This response will be provided upon finalization of the hydrologic design. <br />k. The post-mining topography shown on Map 41 is the currently approved post-mining <br />topography. Colowyo has not updated this map to reflect the changes proposed with <br />Technical Revision 81. Please update the post-mining topography shown on Map 41 to <br />reflect the post-mining topography proposed with Technical Revision 81. <br />Response: We have updated the postmining topography with the proposed topo "PMT TR81 <br />1110" on Map 41. <br />1. On Map 41 in the middle northern portion of Section 3 Colowyo shows a "Stoker <br />Ditch". This ditch is not shown on Map 33 or Map 33A and no designs are contained in <br />the permit for this ditch. This ditch appears to be a contour ditch that will flow into the <br />Streeter Gulch Ditch at approximately station 85+00. Please provide the Division with an <br />explanation of what this ditch is. If this ditch is proposed as a permanent, post-mining <br />channel, please proved design details, including SEDCAD modeling, and include it on <br />either Map 33 or Map 33A. Please also include station tick marks for the ditch on Map <br />41. <br />Response: The Stoker Ditch is an existing temporary structure. The design dates from 1998. <br />Design information is provided in Volume 2C, Exh. 7-148. Note that callout boxes <br />have been added to Maps 12, 12A, 41, and 41A showing the location of design <br />information for all channel designs. The temporary nature of the Stoker Ditch is now <br />clearly presented on all maps. Station tick marks have also been added. <br />38. Colowyo has proposed changes to the mining limits for the South Taylor Pit with <br />Technical Revision 81. The proposed limits have been changed on Map 23A - Mine Plan- <br />South Taylor Pit, Map 29A - Spoil Grading-South Taylor Area and Map 41A - Watershed <br />Boundaries for Hydrologic Modeling-South Taylor Area. Colowyo is proposing to eliminate <br />approximately 358 acres to the south and east of the South Taylor Pit and approximately 92 <br />acres to the west of the South Taylor Pit. Colowyo has also proposed changes to the South <br />Taylor Pit's post-mining topography. These changes will have impacts to the two ponds <br />proposed for the South Taylor Pit area, the Section 21 and Section 28 Ponds. The current <br />models for the Section 21 and Section 28 Ponds are for the approved mining limits and <br />post-mining topography, not the proposed changes to the mining limits and post-mining <br />topography. As such, these pond models are not valid for the proposed changes. Based <br />on the proposed changes to the mining limits and post-mining topography contained in <br />Technical Revision 81, please update the pond models for the Section 21 and Section 28 <br />Ponds. These revised pond models need to reflect the proposed changes to the mining <br />limits, the post-mining topography and the spoil grading plan. <br />Response: This response will be provided upon finalization of the hydrologic design. <br />39. Colowyo has made numerous changes and additions to Exhibit 7, Item 20 that have <br />not been reflected in the Table of Contents. Please review the Table of Contents for Exhibit <br />7, Item 20 and ensure that all changes and additions have been correctly incorporated. <br />Response: The Table of Contents for Exhibit 7, Item 20 has been updated with this submittal.