REV13908

• Permit No: M1973021
• IBM Index Class Name: Revision
• Doc Date: 2/11/1999
• Doc Name: DESIGN REPORT NORTH QUARRY ENGINEERED FILL SLOPE MORRISON QUARRY TR TR-02 PN M73-021
• From: DMG
• To: CAMAS COLO INC
• Type & Sequence: TR2
• Media Type: D
• Archive: No

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STATE OF
COLORADO
DIVISION OF MINERALS AND GEOLOGY
~epanmenl of Nawral Resources
I ; I J Sherm, n SL, Room 215

Denver, CuloraAn dU?Ol I~~~~
Phunc 13U31 BbbJ56i
FAX. [phone]-fl106
DEPARTMEM OF
R~ CES
February 11, 1999 RE$O

Mr. Nlike Reefer Ruy Rumer
covrrnnr
CAMAS Colorado, II1C. Wmrs S. Luc hhrad
3605 S. Teller Street Exec°Iive oirea°r

Lakewood, CO 80235 Michael B. Long
Division Dueclar
RE: Design Report, North Quarry Engineered Eill Slope, Morrison Quarry,
Technical Revision TR-02, Permit No. NI-73-021
Dear Mr. Reefer:
The Division of Minerals and Geology (DMG) has completed a review of the design report for the
proposed engineered fill slope at the Monson Quarry. This design report was submitted to the DMG
as a technical revision in satisfaction a condition placed on the approval of permit amendment AM-OS
to the Morrison Quarry reclamation permit. The design report submittal has been designated technical
revision TR-02, and the decision date for the technical revision has been established as February 26,
1999. Please address the following issues in advance of the decision date to facilitate the DMG's
review of the design report. If CAMUS Colorado requires additional time to address these issues, a
written request for an extension of the decision date must be provided.
Specifications are provided in the design report in the form of construction recommendations. For
example, it is stated in the design report that "Each fill lift should be compacted to at least 95
percent of standard Proctor" (emphasis added). Please conunit to following each construction and
quality assurance recommendation contained in the design report as a binding condition of the
Morrison Quarry reclamation permit and further commit to making no significant changes to the
design plan, specifications, or the quality assurance plan without prior written approval of any
proposed changes from the DMG.
2. The quality assurance plan provided with the design report specifies particle size analysis for
percent passing the No. 200 sieve at a minimum frequency of one test for each 5,000 cubic yards of
fill placed. The design calls for the installation of a granular filter material between the zone B fill
and the zone AI fill. The Filter material is designated zone A2 fill. In addition to the particle size
testing for the main body of the fill, the DMG will require a high frequency of particle size analysis
for the zone Al and zone A2 materials to assure that the specifications contained in the design
report are met, and filter compatibility is maintained. Please provide a specification for particle
size analysis of zone Al and zone A2 till including the type of test to be conducted and the
frequency at which the testing will occur.