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REV06550
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REV06550
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Entry Properties
Last modified
8/25/2016 1:05:23 AM
Creation date
11/21/2007 9:34:44 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Revision
Doc Date
6/13/1994
Doc Name
MOUNTAIN COAL CO WEST ELK MINE PN C-80-007 TR 67 MATERIAL STORAGE BENCH ADDITONAL PRELIMINARY ADEQUA
From
MOUNTAIN COAL CO
To
DMG
Type & Sequence
TR67
Media Type
D
Archive
No
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8. The proposed ground conditions and the DMG selections for the watersheds were <br />reviewed, and the following curve numbers were selected: <br />WATERSHED SUGGESTED DMG REVISED MCC REASON FOR MCC <br /> CURVE # CURVE # SELECTION <br />9A 91 88 Graded area w/mulch <br /> cover <br />9D 81 81 Herbaceous cover <br />9E 89 89 Roadwa <br />35A 91 88 Graded area w/mulch <br /> cover <br />35F 91 88 Graded azea w/mulch <br /> cover <br />35G 91 88 Graded area w/mulch <br /> cover <br />36A 91 87 Pad surfaced with <br /> 3/4" road base <br />36B 91 88 Graded area w/mulch <br /> cover <br />36C 91 88 Graded area w/mulch <br /> cover <br />36E 91 88 Graded area w/mulch <br /> cover <br />36F 91 87 Pad surfaced with <br /> 3/4" road base <br />9. No response is required. <br />10. No response is required. <br />11. A revised Map 54 is enclosed with this response. <br />12. The calculations of flows into the structures have been re-evaluated and revised. <br />12A. Flow into Culvert C2-R3 includes flow into CR-4 and flow from watershed 28, <br />which is 0.06 cfs of 7.37 cfs. <br />12B. Flow into Culvert C2R-4 is derived from flow from the following watersheds <br />WS25 (0.62 cfs); WS16 (1.73 cfs); WS26 (0.23 cfs); WS27 (0.79 cfs); WS21 (3.27 cfs); <br />and WS32 (0.67 cfs). This adds up to 7.31 cfs. <br />4 <br />
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