1985-10-10_HYDROLOGY - M1977378

• Permit No: M1977378
• IBM Index Class Name: HYDROLOGY
• Doc Date: 10/10/1985
• Doc Name: Temporary Disposal of Mine Water Treatment Sludge.
• From: MLRD
• To: Standard Metals Corp.
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

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�� 90 DEPARTMENT OF NATURAL RESOURCES
David H.Getches,Executive Director
MINED LAND RECLAMATION DIVISION
DAVID C. SHELTON, Director
Richard D Lamm
Governor
4ctober 10, 1985
Mr. Douglas Murray
Standard Metals Corporation
P.O. Box 247
Silverton, Colorado 81433
RE: Sunnyside Mine - File No. 77-378
Dear Mr. Murray:
As per recent phone conversation I have had with you and Mr. Dave Moody, I am
sending a letter to confirm items which should be addressed for any temporary
disposal of mine water treatment sludge. At minimum, the following items
s o- a addressed:
1 . Location - The site for this disposal of sludge is of utmost
importance. A map locating the area and drainage area above the site
is required. The size of the actual acreage required should also be
included.
2. A drainage control plan for the site and hydrologic data and
calculations should also be submitted for the system design. A
'-'100-year, 24-hour design criteria is required.
3. The geochemistry and chemical characteristics of the sludge is
required. Samples of the sludge should be taken and results submitted
to the Division. Mr. Murray and I have thoroughly discussed elements,
ions and parameters that should be analyzed.
4. As you have stated, the proposed disposal site location at this time is
the Tailings No. 3 pond. Please discuss water quality and handling of
draining this site of existing standing water.
5. Please discuss and describe any emergency overflow for the disposal
area and if it is necessary. Will a spillway be necessary or will
there be adequate freeboard to contain the volume from a 100-year,
24-hour event.
6. The Division will require that a disposal area be lined or that the
base achieve permeabilities of less than 10-6 cm/sec. We would
strongly recommend a geomembrane liner. The Division would need the
sludge sample chemical data prior to requiring a specific liner design.
423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. [phone]