1996-11-05_HYDROLOGY - M1984049

• Permit No: M1984049
• IBM Index Class Name: Hydrology
• Doc Date: 11/5/1996
• Doc Name: ADEQUACY ISSUES TR5 ENVIRONMENTAL PROTECTION PLAN WIND EROSION CONTROL PLAN HYDORLOGIC MONITOR
• From: DMG
• To: MAPLE GROVE MILL
• Media Type: D
• Archive: No

STATE OF COLOMDO
DIVISION OF MINERALS AND GEOLOGY
of
Depanmenl of Naniral Resources
1313 Sherman . Room 21 S
Denser, Colorado 80201
Phone:(3031 67
FAX:(JO})83
2 6 R 106 7"7
DEPARTMENT OF
November 5, 1996 NATURAL
RESOURCES
Michael & Deborah Combs Roy Romer
Governor
Maple Grove Mill DENVER
OFFI
CE
lames 5.Lochhead
14029 - 61 .00 Road OFFICE E<ec live Director
Montrose, CO 81401-8070 Michael B.Long
Division Director
RE: Adequacy Issues, TR-05, Environmental Protection Plan,
Wind Erosion Control Plan, Hydrologic Monitoring Plan,
Materials Containment Plan, Howardsville Mill, Permit No. M-84-049.
Dear Mr. & Mrs. Combs:
DMG has approved the request for 60 day extension for DMG decision date for TR-05.
DMG decision date for TR-05 is January 1 , 1997. DMG has reviewed the plans
submitted under TR-05 and has identified the following adequacy concerns.
HYDROLOGIC MONITORING PLAN - The hydrologic monitoring plan, submitted under TR-
05, includes 6 surface water monitoring locations and 9 groundwater monitoring
locations. Monitoring locations were depicted on Figure 1 .
Hydrologic monitoring plan, submitted under TR-05, proposes to monitor surface and
ground water sites on quarterly basis for the first year and semi-annually thereafter. DMG
12/7/95 memo from Harry Posey, recommended monthly sampling for the first year and
quarterly sampling thereafter. DMG recommended monthly sampling for the first year to
identify the tailings contaminants and to characterize seasonal variations. DMG is
concerned that quarterly sampling for the first year may not provide sufficient hydrologic
data, especially during pre-law tailings relocation activities. Please respond.
The proposed surface water monitoring plan does not specify that the southern most
(downstream) surface sample location will include all contributions from the pre-law old
tailing pond. Reclamation Plan includes relocation of the pre-law old tailings. Please
clarify whether location of downstream surface sample site is downstream of location
where all surface drainage from the old tailings pond joins Animas River flow.
The proposed surface water monitoring plan does not identify possible contributions from
the Independence Mine. Location of Independence Mine is shown on the attached copy
of USGS 7.5' Howardsville Quadrangle. If contributions from the Independence Mine join
Animas River flow upstream of the southern most surface water sample location, its
contribution should be sampled and submitted with flow data necessary to characterize