GENERAL45183

• Permit No: M1980244
• IBM Index Class Name: General Documents
• Doc Date: 12/27/1994
• Doc Name: CRESSON PROJECT PN M-80-244 INFORMATION ON DEPTH OF STOCKPILED SOIL & REQUEST FOR ALLOWANCE TO STORE
• From: CRIPPLE CREEK & VICTOR GOLD MINING CO
• To: DMG
• Media Type: D
• Archive: No

~~ • • iii iiiiiiiiniu iii
//~' Cripple Creek & Victor Gold Mining Company 999
It ~ A Joint Venture -Pikes Peak Mining Company, Manager
~(1/ ~~\` '../// Operations Office Englewood Office
L\`X7 Y PO. Box 191, 2755 State Highway 67 5251 DTC Parkway. Suite 700, Englewood
Victor, Colorado 80860 Colorado 80111
[phone] • FAX [phone] [phone] • FAX [phone]
December 21, 1994
SENT BY FACSIMILE -HARD COPY FOLLOWS BY MAIL
Mr. Berhan Keffelew
Environmental Protection Specialist
Colorado Department of Natural Resources
Division of Mines and Geology
Office of Mined Land Reclamation
1313 Sherman Street, Room 215
Denver, Colorado 80203
RECEIVED
DEC 2 7 1994
Division of Nmerals & Geology
Reference: Cresson Project: Permit M-80-244: Information On Depth of Stockpiled Soil and
Request For Allowance To Store At Greater Than Twenty-Feet Thickness.
Dear Mr. Keffelew:
During a number of inspections over the last few months Office of Mined Land Reclamation
("OMLR") staff has discussed with The Cripple Creek & Victor Gold Mining Company
("CC&V") the possibility of raising the height of soil stockpiles. Initially the OMLR staff was
going to investigate the issue and then CC&V understood that it would be necessary for CC&V
to provide documentation that allowed higher stacking of soil. We asked Dr. Ed Redente to
review the situation provide an opinion. He has done that and his letter to us is attached.
Dr. Redente concludes that after the period of stockpiling at this operation, it is unlikely that any
bacteria will remain viable except in the upper few feet. Therefore the depth (or height) of
stockpiled soil is not limited by any consideration of the quality of the soil for revegetation. He
also notes that roots will not maintain microbial activity much deeper than 5 feet.
As you know, in order to provide a sight barrier on the southeast side of the valley leach
facility, CC&V has stockpiled soil to a total depth exceeding 70 feet. CC&V proposes that the
height of stockpiled soil be limited by the geotechnical and erosional stability of the pile rather
than an absolute limit. From Dr. Redente's investigation it appears that there is nothing
particularly magic about atwenty-foot height guide. Thus, when it is beneficial to limit the areal
extent of disturbance, it would be wise to store the soil in as high a pile as is feasible and safe.
CC&V wishes to obtain the OMLR's approval to raise the Joe Dandy area stockpile to a height
which is geotechnically and erosionally stable. The pile in this area is stable. At this time
CC&V proposes average heights on the order of 50 feet. We will store the soil in a manner that
control mass movement, allows seeding for erosion control, and retains the soil in the area of
the stockpile. If CC&V encounters significant additional soil that necessitates consideration of
higher average heights, we will notify the OMLR and ask for similar approval.