REP30079

• Permit No: C1981018
• IBM Index Class Name: Report
• Doc Date: 8/15/1996
• Doc Name: 1995 ANNUAL HYDROLOGY REPORT MEMO
• From: DMG
• To: DAN MATHEWS
• Annual Report Year: 1995
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

-s iii iiiiiiiiiiiu iii
999
STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Deparlmenl of Naluml Resources
131 3 Sherman 51., Roam 215 J
Q

Denver, Colorado A0203 I
~~
~

Phone: [phone] I I
FA%: (303) 83?-8106
DEPARTMENT OF
NATURAL
RESOURCES
To: Dan Mathews Roy Romer
Governor
From: Barbara Pavlik wme~s Lnrhnead
hecuoue Duecmr
Michael g Long
Date: August 15, 1996 Drvismn Director
Re: Annual Hydrology Report
Deserado Mine (C-81-018)
I have reviewed the above referenced Annual Hydrology Report (AHR)
and have the following comments:
1) On page 10 of the AHR, under Bedrock Water Ouality, the
operator states that one water quality sample will be
collected from the wells on leases C-8424 and C-8425
prior to entering the leaseholds. Please remind the
operator that sampling of these wells is not limited to
one time prior to entering the leaseholds. Rather, water
sampling is to be recommenced in the leaseholds at least
one year prior to requesting final bond release. This
was discussed in my memo to you, dated May 20, 2996,
regarding TR-40.
2) The operator repeats its language from previous years'
AHR's, on page 15, where it is explained that the WQCD
sent an effluent sample and prior toxicity reports to the
EPA laboratory in Duluth, Minnesota t investigate the
cause of toxicity of the discharges at Deserado. The
operator states that they believe the WQCD has not heard
from EPA in this regard. These samples were sent in
1992. You might consider contacting WQCD and inquiring
as to whether these samples were ever analyzed.
3) In Appendix C, Page C-1, it is unclear whether the
"Depth" column indicates the total depth of the well or
the depth to water. Please have the operator clarify
this.
4) The missing surface water data which you noted in your
April 8, 1996 memo, was subsequently provided.
5) In answer to your question ~3 in the above mentioned
memo, field parameters should be collected on the mine
inflows in order to comply with the terms of the permit.