REV95521

• Permit No: C1980006
• IBM Index Class Name: Revision
• Doc Date: 4/28/1995
• Doc Name: KERR COAL CO MARR MINE TR 13 PIT 1 APPROXIMATE ORIGINAL CONTOUR CONFIGURATION PN C-80-006
• From: DMG
• To: WALLY ERICKSON
• Type & Sequence: TR13
• Media Type: D
• Archive: No

III IIIIIIIIIIIIIIII
999
STATE OF COLOI~UU
DIVISION OF MINERALS AND GEOLOGY
Depanmem of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FA%:[phone]
DATE: April 28, 1995
T0: Wally Erickson
FROM: Jim Pendleton

I~~~~
DEPARTMENT OF
NATURAL
RESOURCES
Roy Romer
Governor
lames S. Lochhead
Eseculive Director
Michael 8. Long
Division Director
RE: Kerr Coal "mpany, arr Mine, Technical Revision 13,
Pit No. 1 p mate Original Contour Configuration
(Permit No: C-80-006)
I ha~~e finally managed to review the T.R. 13 application which you
fonA~arded to my attenmtion several months ago. This application,
required of Kerr by settlement agreement with DMG and OSMRE, presents
the required amendment to the backfilled configuration of the Marr mine
Pit Flo. 1.
Geouechnically, because every modification appears to flatten the
eventual slopes, I don't perceive that any slope stability problems will be
encountered by the enhanced reclamation grading. The only concern I
foresee will be consolidation of the backfilled portions of Pit No. 1. Marr
has evidenced consolidation of backfill previously. Any cracking should be
treatable with minimal clean up and filling of cracks. At the worst minor
regrading might be required if gradient reversals were to occur in the
lower gradient drainage swales.
In my opinion, the proposed design is acceptable as proposed.
cc: David Berry
Doc: M:/COAL/JAP/MARRPITI.TR