GENERAL45672

• Permit No: C1981037
• IBM Index Class Name: General Documents
• Doc Date: 10/20/1989
• Doc Name: MINIMUM REQUIREMENTS FOR RECLAIMING THE GEC EAST PIT
• From: MLRD
• To: MIKE LONG
• Permit Index Doc Type: GENERAL CORRESPONDENCE
• Media Type: D
• Archive: No

- . - ~ III IIIIIIIIIIIIIIII
999
~~~°.~,~~~ STATE OF LULORADO
Roy Romer, Gove
DEPARTMENT OFNATURALRESOURCES
MINED LAND RECLAMATION DIVISION
FRED R. BANTA, Director
DATE: October 20, 1989
T0: Mike Long
FROM: Carl MountC~~}4~
RE: Minimum Requirements for Reclaiming the GEC East Pit
As you requested I would like to forward the following conclusions as to what
would be the minimum acceptable reclamation standards for the East Pit. This
has been done following review of the GEC files, East Pit site inspections,
work with volumetric analyses on the Geologic Information System computer
programs, and discussion with yourself and other specialists in the Division.
At a minimum, the Division should require the following:
1. Exposed coal seams should be protected with a minimum of four feet of
inert material.
2. The underground development waste fill from Southfield must be designed
according to the applicable standards of Rule 4.09 to ensure stability.
3. The fill from Southfield must be covered with four feet of non-toxic
cover (including topsoil).
4. Final fill slopes must be no steeper than 3H:1V (3 horizontal:l vertical)
unless steeper slopes are designed to be structurally and erosionally
stable. In no case should final slopes be steeper than 2H:1V. It should
be noted that final slopes steeper than 3H:1V mdy not comply with
Rule 4.14 (Approximate original contour.)
5. The final backfilled surface should be ripped and/or chisel plowed along
the contour prior to topsoil/topsoil substitute placement.
6. The preanining channel that directs water from the south to the north end
of the pit should be reestablished. This channel must be designed to be
erosionally stable. This will require some riprap design and placement.
7. Some amount of topsoil and/or topsoil substitute must be applied to all
reclaimed surfaces. There is presently enough topsoil/topsoil substitute
material available in the disturbed area to cover the entire East Pit
area to a depth of 6-8 inches. This does not include any material that
may be pushed down from the east highwall.
215 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. [phone]