REV105459

• Permit No: M1973021
• IBM Index Class Name: Revision
• Doc Date: 10/9/1998
• Doc Name: ENGINEERED FILL SLOPE IN THE NORTH QUARRY CAMAS COLO INC MORRISON QUARRY AMENDMENT AM-05 PN M-73-021
• From: DMG
• To: GREGG SQUIRE
• Type & Sequence: AM5
• Media Type: D
• Archive: No

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DIVISION OF MINERALS AND GEOLOGY
Deparlmenl of Nalu ral Resources
1 113 Sherman 51., Ronm 21 S
Denver, Colorado 80'_03
Phone: [phone]
FAn: 13031 83?8106
DATE: October 9. 1998
TO: Gregg Squire
FROM: Allen Sorenson `L
RE: Engineered Fill Slope in the North Quarry, CAMAS Colorado, Inc.,
Morrison Quarry, Amendment AM-O5, Permit No. M-73-021
~~
DEPARTMENT OF
NATURAL
RESOURCES
Roy Romer
Governor
lames 5. Lochhead
Evecuuve Director
Michael B. Long
Division DireUOr
In the Amendment AM-OS application for the Morrison Quarry, the Operator proposes the
construction of a fill slope against the west wall of the North Quarry. This fill slope is to be
constructed of structural fill but may also include granite sand, quarry overburden and poor
quality rock, as well as the so-called `jade-air fines" from the wash plant. The identification and
geotechnical analysis of the fill material has not yet been completed. However, the Operator is
asking for approval of the conceptual design via the Amendment AM-OS application, and
proposes to meet a target minimum safety factor of 1.25 for the fill slope. The Operator further
proposes to submit the final design for the fill slope as an addendum to the Morrison Quarry
annual reclamation report, and to provide performance and construction QA/QC reports as a
component of annual reclamation reports during the years that the fill slope is constructed.
The conceptual proposal for an engineered fill slope in the North Quarry as it is presented ilt the
Amendment AM-OS application may be approved by the Division. However, the following
issues must be addressed by the Operator prior to issuance of the approval.
1. Rather than submitting the final design for the fill slope as an addendum to the annual
reclamation report, [he Operator must provide the design as a technical revision to the permit.
The performance and construction QA/QC reports for years during which fill slope construction
takes place may be submitted as a component of the annual report.
2. The following items must be included in the final design of the fill slope:
a) Identification of the different types of fill materials proposed for use, and the data
resulting from geotechnical testing of these soils.
~~I'~~II~~~~I'~~~I~
STATE OF COLORADO
b) A description of any soil amendments and geosynthetics proposed for use in
enhancing the stability of the fill.