REP23918

• Permit No: C1981022
• IBM Index Class Name: Report
• Doc Date: 9/4/1996
• Doc Name: GOB PILE REPORT SANBORN CREEK MINE C-81-022
• From: DMG
• To: OXBOW CARBON & MINERALS
• Permit Index Doc Type: Waste Pile/Fill Report
• Media Type: D
• Archive: No

III IIIIIIIIIIIII III
STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Depanmenl of Natural Resources
1313 Sherman 51., Room 215

Denver, Colorado 80201 lii~~

Phone [phone] II
FAX: [phone]
DEPARTMENT OF
NATURAi
September 4, 1996 RESOURCE
Roy Romer
Governor
Thomas C. Anderson, PE lames 5. Lochhead
Executive Director
Environmental Coordinator Michael B. Long
Oxbow Carbon and Minerals Division Direcinr
P.O. Box 535
Somerset, CO 81434
RE: Gob Pile Report -Sanborn Creek Mine - C-81-022
Dear Mr. Anderson:
We have reviewed your letter of July 16, 1996, in which you request that stipulation No. 16 be
terminated.
We recognize your interest in the removal of Stipulation No. 16. However, the regulation
(4.10.4(3)) in question states:
"Compaction requirements during construction or modification of all coal mine waste bands
shall be:
(a) Spread in layers no more than 24 inches in thickness;
(b) Compacted to attain 90 percent of the maximum dry density to prevent
spontaneous combustion and to provide the strength required for stability of
the coal mine waste blank. Dry densities shall be determined in accordance
with the American Association of State Highway and Transportation Officials
(AASHTO) Specifications T99-74 (Twelfth Edition)(July 1978) or an
equivalent method. AASHTO T99-74 is hereby incorporated by reference as
it exists on the date of adoption of 4.10."
There is the potential for a variance as stated in 4.10.4(3)(c), although this variance requires
"compaction testing". Please note in particular the last sentence in the quote below.
"(c) Variations may be allowed in these requirements for maximum allowable lift
thickness and minimum requires compaction, after approval of the variance
by the Mine Safety and Health Administration's (MSHA) District Manager,
as required by 30 CFR 77.215. Copies of the MSHA district manager's
written approval and the application documents furnished for his review,