2009-10-05_PERMIT FILE - C1982057A ‎(2)‎

• Permit No: C1982057A
• IBM Index Class Name: Permit File
• Doc Date: 10/5/2009
• Section_Exhibit Name: Tab 20 Backfilling and Grading
• Media Type: D
• Archive: Yes

. TABLE 20-1
POSTMINING LANDFORM MASS BALANCE
(NORTH AREA)
Preminina Pit Material Volume Calculations
Premining Material Volume 49,694,919 cy
Virgln Overburden Material Volume 9,073,200 cy
Total In-Place Coai Volume 9,621,719 cy
Recoverable Coal Volume 9,010,123 cy
Non-Recovered Coal and Parting Material Volume 11,596 cy
Premining Overburden Volume 40,684,796 cy
Total Pit Spoil Volume 46,909,570 cy
Preminina Material Mass Volume:
Total Pit Spoil Mass Volume = 46,909,570 cy
Total Premining Material Volume = 49,694,919 cy
Volume to Achieve Premining Original Ground Surface = 2,785,349 cy
• % Difference = -5.6
Average Elevation Change of Disturbed Lands = -3.7 ft
Postminino Material Volume Calculations
Postmining Spoil Material Calculated:
Postmining Spoil Material Volume (Internal) 46,878,503 cy
Postmining Spoil Material Volume (External) 348.505 cv
Total Postmining Spoil Volume 47,227,008 cy
Postminino Overburden Materia! Excavated
Premining Total Pit Spoil Volume 46,909,570 cy
Postmining Overburden Material (External) 1.627.342 cv
Total Overburden Material Excavated (Swelled) 48,536,912 cy
Postminino Material Volume Comparison
Total Postmining Spoil Volume 47,227,008 cy
Total Overburden Material Excavated 48.536.912 cv
. Volume Difference 1,309,904 cy
Difference = -2.7
PR-05 7 Revised 01/06