REP01377

• Permit No: C1980001
• IBM Index Class Name: Report
• Doc Date: 10/18/1994
• Doc Name: DIVISON REVIEW OF EDNA RESPONSES TO CDMG LETTER DATED JULY 19 1994
• From: DMG
• To: SUSAN MORRISON
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

ii i i iii ii iiiiii iiii
STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
1717 Sherman Sl., Room 215 `d

Denver, Colorado 80203 ~
~~

Phone: [phone] II
FA%:1703) 832-8106
DePAarn~rrr of
NATURAI
Date: October ls, 1994 RESOURCE`
To: Susan Morrison
. Rnv Romer
Governor
/~'~~
r/ uJ.\ lames i Lochhead
l~%)
~r ~{
From: Kent Gorha ll Executive Director
/ Michael B. Long
/
CC: David Berry Division Director
RE: Division review of Edna responses to CDMG letter dated July
19, 1994
I have reviewed the information you provided to me via the P & M
Coal Co. concerning the reasons why establishing a Trout Creek
Sandstone monitoring well at the Edna mine is not necessary. My
original adequacy issue was stated as follows:
1. The operator should establish a Trout Creek sandstone
bedrock well so that the Division can verify the presence (or
lack of) an impact to the Trout Creek sandstone. Discussions
on why .this is necessary have taken place previously and no
permitting action should be approved without this requirement
being met.
Only the second paragraph of the one page provided dealt with the
Trout Creek sandstone bedrock unit. Furthermore, no data, graphs,
maps, or charts were provided. The mine is actively mining in a
portion of the recharge zone of the Trout Creek sandstone. Also, no
further discussion of faulting, particularly in the Moffat area,
was provided. It was my understanding that faults are present.
From the text that was provided, the only conclusion that can be
made is that water from a unit 24 feet below the coal seam could
possibly enter the pit as inflow. How this relates to the Trout
Creek Sandstone unit I am not sure.
One of the findings that the Division is required to make at final
bond release is that pollution of surface and sub-surface waters is
not occurring. Also we are required to ensure that the approximate
recharge capacity has been restored after mining. Adown-gradient
well in the Trout Creek Sandstone will allow the Division to make
these finding for this regional aquifer.
In summary, the operator should immediately establish this well and
include it in its hydrologic monitoring program.
If .you have questions, let me know.