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2013-03-28_REVISION - C1981019
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2013-03-28_REVISION - C1981019
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Last modified
8/24/2016 5:18:54 PM
Creation date
3/28/2013 10:42:06 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
REVISION
Doc Date
3/28/2013
Doc Name
2nd Adequacy Letter Response
From
Colowyo Coal Company
To
DRMS
Type & Sequence
TR97
Email Name
RDZ
DIH
Media Type
D
Archive
No
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COAL <br />s <br />COMPANY <br />,.r." 100 <br />EOpLE•pRODUCTtOK* <br />Colowyo's Response: Per a conference call between DRMS staff and Colowyo <br />staff on March 25, 2013, at 10:30 AM, this comment was discussed and from <br />that discussion it was agreed that the sub - watersheds need to be delineated <br />correctly. Therefore, Figures 7 -14R -1 and 2 have been updated accordingly. <br />Sub - watersheds D, K, L, N, O, I, J, E1, and E2 within the Prospect Watershed <br />have been re- delineated and remodeled. Colowyo is resubmitting Figures 7- <br />14R-1 and 2, and associated SEDCED modeling outputs. <br />3. For the North Tributary of East Pit Ditch, please explain why drainage areas <br />are modeled as "structures." <br />Colowyo's Response. <br />On complex drainages or drainages that vary in size over several modeled time <br />frames, we have elected to show the actual SEDCAD structures on the <br />watershed maps to make it easier to follow the model. The sub - watersheds <br />themselves are not actually modeled as "structures': Rather, the collection <br />points (eg., nodes, channels, channel junctions, stock ponds, etc) are modeled <br />as "structures': In some cases, a "structure" may, have only a single <br />subwatershed tributrary to it (eg. Subwatershed W into Structure I in the <br />1VTEP ditch, or Subwatershed El as the only subwatershed directly tributary <br />to Structure 9). In such cases it may seem that the watershed is modeled as a <br />structure, but the opposite is actually true. The structure is fed by that single <br />sub - watershed. <br />Current Division comments: The SEDCAD reports indicate that sub - <br />watersheds are "structures." For example, in the structure networking on <br />page Exh. 7- 14R -9, structure numbers 1 and 5 are sub - watersheds W and O, <br />respectively. Please explain why this was modeled this way. <br />Colowyo's Response: <br />The verbal descriptions that appear in the rightmost column of the "Structure <br />Networking" tables in the SEDCAD output reports are simply verbal tags the <br />modeler used to make sure all of the sub - watersheds had been accounted for <br />in the model, as shown on the Figures Exh. 7 -14R- 1 and -2. These words <br />have no operational impact on the model, but are useful to the modeler to <br />make sure all sub - watersheds are collected. In view of the confusion this has <br />caused, we could amend the models by typing in a different verbal description <br />in the model input. For example, in Structure 1 in the NTEP /Final East Pit <br />Ditch model, which is a "null" collection point for sub - watershed W, we could <br />A mining property of Western Fuels- Colorado, A Limited Liability Company <br />
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