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2010-12-15_REVISION - C1981019
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2010-12-15_REVISION - C1981019
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Last modified
8/24/2016 4:27:56 PM
Creation date
12/16/2010 8:10:01 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
REVISION
Doc Date
12/15/2010
Doc Name
Letter Regarding Comments and Responses
From
Colowyo Coal Company
To
DRMS
Type & Sequence
TR81
Email Name
JRS
SB1
Media Type
D
Archive
No
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shown on both maps. Additionally, the Division recommends making a notation following <br />the ditches common to Maps 41 and 41A to instruct the viewer that these ditches are shown <br />on both maps. <br />Response: As previously noted, the drawing files that create Maps 41 and 41A have been <br />combined. The same is true for Maps 12 and 12A. Call out boxes have been added to <br />Maps 1212A & 41_41A, with information to present the location of the hydrologic <br />design information for both ditches and sediment ponds. We believe this will greatly <br />clarify the presentation of hydrologic design information. Instead of the Division's <br />recommendation regarding a legend entry about ditches common to both maps, we <br />have updated the small location map near the title block that shows the map <br />coverage. <br />a. On the currently approved Map 41 the Taylor Tributary Ditch flows from the top of <br />the East Taylor Fill through the West Pit and into the East Taylor Pond. The approved toe <br />of the East Taylor Fill is at approximately station 87+00 of the Taylor Tributary Ditch. The <br />proposed toe of the East Taylor Fill will put it at approximately station 80+00 of the Taylor <br />Tributary Ditch. Additionally, the proposed plan for the East Taylor Fill does not call for <br />the Taylor Tributary Ditch to flow down the middle of the East Taylor Fill. Rather, the East <br />Taylor Fill will drain into the East Taylor East Tributary Ditch and the East Taylor West <br />Tributary Ditch. There two ditches will then flow into the Taylor Tributary Ditch (and <br />ultimately into the East Taylor Pond). Please redesign the Taylor Tributary Ditch to <br />correct its length and location for the proposed toe of the East Taylor Fill (Map 12 and <br />Map 33A will also need to be updated with this redesign). Please provide new SEDCAD <br />modeling for the redesigned Taylor Tributary Ditch. Please include the new fill design on <br />Map 41 as well as the portions of the East Taylor East Tributary Ditch and the East Taylor <br />West Tributary Ditch that appear on Map 41. Please include the portion of the Taylor <br />Tributary Ditch that appears on Map 41A. Please provide new SEDCAD modeling for the <br />East Taylor Pond to reflect the changes to the Taylor Tributary Ditch, the East Taylor East <br />Tributary Ditch, the East Taylor West Tributary Ditch, the East Taylor Fill and the changes <br />to the post-mining topography on and around the East Taylor Fill. <br />Response: This response will be provided upon finalization of the hydrologic design. <br />b. The West Pit Ditch intercepts the Taylor Tributary Ditch at approximately station <br />78+00. This intercept location is just below where the East Taylor Fill will toe out (at <br />approximately station 80+00 of the Taylor Tributary Ditch). Please review the location of <br />the West Pit Ditch to ensure its location will not be affected by the proposed toe of the <br />East Taylor Fill. Please add the West Pit Ditch to Map 41A. <br />Response: The West Pit Ditch has been deleted given its close proximity to East Taylor, East Trib <br />Ditch. <br />C. Map 41 shows the Section 16 Taylor Ditch (Version 2). This ditch is located in the <br />southwest corner of the map and is above (topographically) the East Taylor Fill. The <br />approved design of the ditch appears to have it draining into an area above the fill and, <br />ultimately, into the Taylor Tributary Ditch. This ditch is not shown on Map 41A. As <br />discussed in "a" above, the proposed design for the East Taylor Fill has the runoff flowing <br />into the East Taylor East Tributary Ditch and the East Taylor West Tributary Ditch and, <br />ultimately, into the Taylor Tributary Ditch. Based on the proposed plan it appears that the
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