PERMFILE134062

• Permit No: M1997054
• IBM Index Class Name: Permit File
• Doc Date: 9/9/1997
• Doc Name: FN M-97-054 ADEQUACY ITEMS
• From: LARRY D OEHLER
• To: MITCH ALBERT
• Section_Exhibit Name: EXHIBIT C PRE MINING & MINING PLAN MAPS OF THE AFFECTED LANDS
• Media Type: D
• Archive: No

DEFICIENCY NOTICE CMLRB 112 Permit Application
Agile Slone Systems, Inc.
~ STATE OF COLORADO
DIYISISION OF MINERALS AND
Department of Natural Resources
1313 Sherman SL, Room 215
Denver, Colorado 80203
Phone [phone]
FAX: [phone]
To: Larry Oehler
From: James Dillie
Date: July 31, 1997
Re: Review of Parkdale Project Application, File No. M-97-054
At your request, I reviewed the referenced permit application. Specifically, I attempted to
evaluate stability of the quarry highwalls, the effects of blasting operations and the adequacy of
the proposed installation of culverts in Tallahassee creek.
The applicant did not submit sufficient data to complete an evaluation of any of the operations.
The operator did submit a minimal amount of information for the quany highwall; height and
width of the cuts and benches (plus the overall slope angle). However, since it appears the
overall slope angle will be steeper than the internal friction angle, I will need a few more details
about the local geology. First, is the granite altered or unaltered. Second, what is the strike and
• dip of the predominant fracture systems. Third, what is the elevation of the phreatic surface (if
any). Fourth, what earthquake coefficient did the operator use to determine that the highwall
feature is well within reasonable and conservative engineering limits for a long term safety from
the standpoint of overall slope stability.
Other than stating that scaled distance formulas will be used to establish safe seismic disturbances
and air blast limits, the applicant did not submit any data concerning the effects of blasting
operations. Of the available compliance options the applicant chooses to submit a scaled distance
analysis using the scaled distance equation to determine maximum chazge weight per 8 ms delay.
This is the simplest of all ground motion compliance options so it will not be difficult to submit
the analyses prior to permit approval. The applicant should determine a charge weight, or scaled
distance, for all structures within 5000 feet of the quany. Also, the applicant should address the
potential flyrock problem. What safety measures will the applicant commit to in order to protect
the public from flyrock?
Finally, the applicant proposes to install culverts in Tallahassee creek. How did the applicant
decide what size culvert to use? The applicant should submit a detailed analysis showing the
watershed area and potential runoff amounts so the Division can determine if the culverts aze
properly sized. Also, the applicant states that sediment control structures will be constructed in
the permit area. However, [he applicant did not submit any data regarding the size of the
structwes or their capacities.
Let me know when the applicant submits the above noted information so I can review it.
. SEE EXHIBITS D, G AND SUPPLEMENTARY DATA FOR DISCUSSIONS ON ALL
ITEMS ABOVE.
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