REP40968

• Permit No: C1981014
• IBM Index Class Name: Report
• Doc Date: 6/28/1995
• Doc Name: 1ST QUARTER POND AND REFUSE PILE INSPECTION REPORTS SOUTHFIELD MINE PN C-81-014
• From: DMG
• To: DAVID BERRY
• Permit Index Doc Type: Waste Pile/Fill Report
• Media Type: D
• Archive: No

DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
1313 Sherman St., Room ? 15
Denver, Colorado 80201
Phone: [phone]
FAX: [phone]
iii iiiiiiiiiiiiiiii
999
STATE OF COLORADO
~~
DEPARTMENT OF
NATURAL
RESOURCES
DATE: June 28, 1995 Roy ROme.
Governor
lames S lochheaA
TO: David Berry Executive Dueaor
Michael B. Long
FROM: Christine Johnsto Orvnion Director
RE: 1ST Quarter Pond and Refuse Pile Inspection Reports;
Southfield Mine; Permit No. C-81-014
Pursuant to your request I have reviewed the 1st Quarter Pond and
Refuse Pile Inspection Reports for the Southfield Mine. The
reports indicate the inspection occurred on March 17, 1995. I
reviewed the regulations (specifically 4.10 and 4.05.6(13)), the
permit (specifically Exhibit 18), Technical Revisions No. 14 and
15, and past inspection reports, in order to determine the required
contents of these reports.
Refuse Pile Inspection Reports
Requirements
* The regulations require that the fill be inspected for stability
at least quarterly throughout the construction and during critical
construction periods, which includes placement and compaction of
fill materials (4.09.1(11)(a)). Inspections are to include
observations and tests to evaluate the potential hazard to human
life and property, and to ensure that all organic material and
topsoil have been removed and that proper construction and
maintenance are occurring in accordance with the approved plan.
The engineer shall consider steepness of slopes, seepage, and other
visible factors which could indicate potential failure. Copies of
the inspection report are to be maintained at the mine site and the
certified report provided to the Division within two weeks after
each inspection.
* Rule 4.10.4(3) details compaction requirements during
construction of coal mine waste banks, which include: (1) spread
in layers no more than 24 inches in thickness; and (2) 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 bank.