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REV91362
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REV91362
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Entry Properties
Last modified
8/25/2016 3:12:55 AM
Creation date
11/21/2007 11:10:31 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Revision
Doc Date
7/2/1993
Doc Name
WEST ELK MINE PERMIT C-80-007 RESPONSE TO SECOND ADEQUACY REVIEW TR 63 LOWER REFUSE PILE RECONFIGUR
From
MOUNTAIN COAL CO
To
MLR
Type & Sequence
TR63
Media Type
D
Archive
No
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r <br />r <br />Page 2 <br />C.JohnS~n <br />07101 /93 <br />~b. The soil volumes presented in Phases 1 & II were taken from Table 2.4 <br />in the existing Exhibit 51, that were prior to the variance from four feet <br />of soil cover. Phases III 13< IV soil volumes were taken from Table 3 - ~„f ul S(~1 <br />and reflect the maximum soil depth volumes as approved in the 1 , <br />variance. <br />~oc3. <br />/ <br />3G~p ~ ~~, O~Z • c. Note 4 in Table 4 has been replaced by a new note 4. <br />,~y ~~ c~ iS 3C,3~L 7°~a <br />6.0 Surface Hvdroloav <br />r <br />V10 j ~, Il~1SN~ 1. Paragraph two on page 23 has been corrected to a 100 year, 24 hour <br />peak discharge for the design of all ditches and diversions. <br />(,'~ d 2. The southwest ditch (D6-2 in Exhibit 66) is currently riprapped, but the <br />. ~ -~~ east ditch is not, as the final configuration of the southeast edge of the <br />~- ~ SSU ~ pile has not been achieved. The lower portion of the east ditch is in <br />~, , 3 ~^n ~ d(,- ~~ place and is approximately half of the overall final grade (8%) of the ditch <br />~•ii! I ~ r`~dd~ d ~ ^ .con gurat otn.xAs the so theast side of the pile is completed the east <br />i~ ~ 4 - ditch will be riprapped. <br />~~3. See footnote #3 of Table 9 in revised Exhibit 51. <br />otlwrwi Sc ofc, <br />will lw ~• These pages have been provided to Greystone Consultants to include in <br />(C~l4C ~ ~,tr inY the SedCAD runs. Responses to questions 3 through 6 (above and <br />. ~~~ )~ below) will be provided in the responses to TR 64. <br />~ /5. See response #4 above. ,~f nv~ dA4~ 2`~ ~k~ine,7v n9 2~ S D~~ ~" <br />' ) 4/K~ SGi,;ul~Sf/l/ <br />I , ~~ yrC`~'S(d h,C d A~'( S~f c1 I Vl ~ (i ~' • <br />W~ ~ D<- ti See response #4 above. <br />i ~ i 1~~~ <br />~~. A paragraph to include the riprap gradation information has been <br />/ included before Table 9 in revised Exhibit 51. ~Oh r~. 2~ <br />('ll~" 8. Envirocon's response letter (see attached) verifies that the diversion <br />`~ ~~r~o~b~erm`~ III divert a 100 year - 24 hour storm event. <br />,/ 9. A third paragraph has been added to section 6.1 to include a discussion <br />~w on positive drainage. ~~ ~~ <br />
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