REP26680

• Permit No: C1981020
• IBM Index Class Name: Report
• Doc Date: 4/15/1996
• Doc Name: REVIEW OF ANNUAL HYDROLOGY REPORT GROUNDWATER PORTION MCCLANE & MUNGER MINES C-80-004 & C-81-020
• From: DMG
• To: DAN MATHEWS
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

~IIII~I~~II~II~~II .... .....:.:.. ... .:_ _...
STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Depanmenl of Nawral Resources
1 J 13 Sherman 8i., Room 215 ~ly~~
Denver, Colorado 80203 I
Phone:I30J1 866 J567
FA%~ (J031 BJ2-8106
DEPARTMENT OF
To: Dan Mathews NATURAL
~, ~sou~cEs
From: Barbara Pavlikb Roy ROmer
Governor
Date: A ril 15 1996 Iamess.Lxhhe,d
p / EaecNrve Director
o-~ichzel 8. Long
Re: Review of Annual Hydrology Report (Groundwater Portion) Drcision Director
McClane 6 Munger Mines (C-80-004 6 C-81-020)
I have completed a review of the groundwater portion of the Annual
Hydrology Report for the McClane & Munger Mines. My comments are
presented below. Susan Burgmaier will be presenting you with a
review of the surface water portion of the AHR for these mines.
Without further ado, then........
1) The PHC sections of these permits are vague with regard
to quantification of potential effects of mining on the
groundwater regime. However, both PHC's predict minimal
impacts. The miniscule amount of flow recorded into the
underground workings appears to support a hypothesis of
insignificant impact to groundwater quantity.
Additionally, no significant trends were noted in the
groundwater quality samples. Therefore, the AHR data
appear to be congruent with the predictions in the PHC.
2) It is my opinion that monitoring of the dry well in the
proposed waste disposal area could be discontinued until
shortly before the construction of the waste disposal
area is started. The well should be probed for water
content prior to commencing the construction of the waste
pile so that, if groundwater is present at that time,
then a true background sample may be collected for
chemical analysis.
3) The operator provides three "Ventilation and Projection"
maps in the AHR. None of these maps show the hydrologic
monitoring stations. A map showing the hydrologic
monitoring stations would be more helpful to both the
person reviewing the AHR and to the general public, and
should, therefore, be provided in subsequent AHRs.
If you or the operator have any questions, please call.
cc: Larry Routten, Susan Burgmaier