APPCOR10642

• Permit No: C1994082
• IBM Index Class Name: Application Correspondence
• Doc Date: 1/13/1995
• Doc Name: YOAST MINE C-94-082 PRELIMINARY ADEQUACY CONCERNS PERMIT APPLICATION
• From: DMG
• To: SUSAN L BURGMAIER
• Media Type: D
• Archive: No

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STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Depanmem of Nawral Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
To: eusaa L. Burgmaier
From: Barbara L. Pavlik
Re: Preliminary Adequacy Concerns
Yoast Permit Application (C-94-082)
Date:~anuary 13, 1995
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DEPARTMENT OF
NATURAL
RESOURCES
Roy Romer
Governor
lames S. Lochhead
Evecuiive Director
Michael B. Lang
Division Director
I have reviewed the following sections in the referenced permit
application:
General Description of Hydrology and Geology
Geology Description
Groundwater Information
Surface Water Information (quality)
Alternative Water Supply
Mitigation of Impacts to Hydrologic Balance
Protection of the Hydrologic Balance
Alluvial Valley Floors
Based on my review, I have the following comments and concerns:
Tab 6: Geolocv and Overburden Assessment
1) Exhibit 6-1, showing the structural geology of the
proposed permit area, shows two adjacent anticlines with
no syncline between them. Please explain.
Tab 7: Hydrologic Description
2) High transmissivities observed in some of the bedrock
wells were attributed to assumed failure of the annular
seals. PWCC should explain whether they considered the
possibility of fractured bedrock as a cause for the
elevated transmissivities, and how it was determined that
annular seal failures were the cause rather than
fractures or other phenomena.
3) Rule 2.04.7(1)(1) requires the operator to define the
horizontal extent of the potentiometric surface of
aquifers above, within, and below the coal seam to be
mined. This information does not appear to be included
in the permit application package.