GENERAL38288

• Permit No: M1980244
• IBM Index Class Name: General Documents
• Doc Date: 11/1/1994
• Doc Name: CRESSON PROJECT PN M-80-244 FREQUENCY OF PERMEABILITY TESTING OF IRONCLAD SOIL LINER MATERIAL
• From: CRIPPLE CREEK & VICTOR GOLD MINING CO
• To: DMG
• Media Type: D
• Archive: No

- • ~ III IIIIIIIIIIIIIIII
~/'~` Cripple Creek & Victor Gold Mining Company 999
l\ A Joint Venture -Pikes Peak Mining Company, Manager
~('~/Q 7./ Operations Office Englewood Otlice
[i~7iT !!'/ P.O. Box 191, 2755 State Highway 67 5251 DTC Parkway, Suite 700, Englewood
Victor, Colorado 80860 Colorado 80111
[phone] • FAX [phone] [phone] • FAX [phone]
October 27, 1994
SENT BY FACSIMILE -COPY FOLLOWS BY MAIL
Mr. Berhan Keffelew
Environmental Protection Specialist RECEIVED
Colorado Department of Natural Resources
Division of Mines and Geology NOV Q 1 1994
Office of Mined Land Reclamation
1313 Sherman Street, Room 215
Denver, Colorado 80203 Division ut minerals & Geology
Reference: Cresson Project: Permit No. M 80-244 Frequency of Permeability
Testing of Ironclad Soil Liner Material.
Dear Mr. Keffelew:
Cripple Creek & Victor Gold Mining Company ("CC&V") is submitting a summary of the
permeability data generated for the Ironclad Soil Liner Material. This summary was provided
to the Office of Mined Land Reclamation ("OMLR") on October 13, 1994 during a meeting
between CC&V and the OMLR and it was our understanding that Dr. Pendleton and probably
Mr. Sorenson were going to review it and judge the tests' adequacy in terms of reducing the
frequency of testing. This letter confirms the request in light of informally-transmitted
information suggesting that the OMLR was not yet comfortable with the information and that
the frequency could not be returned to that approved in the specifications.
The specifications require permeability testing pursuant to ASTM D5084/2434 at a frequency
of 1 test for every 15,000 yd'. CC&V committed to conduct additional testing in its letter of
April 19, 1994 and in its revised transmittal of April 26, 1994. That agreement stated "15. The
frequency of permeability testing for soil liner fill will be on test for each 5000 cubic yards of
fill until such time that the OMLR approves a lower frequency for testing. Proposals for such
approval would be based upon a demonstration of consistency in the initial results." I believe
that the OMLR staff members who were instrumental in evaluating the use of the Ironclad
material as a liner discussed the testing frequency many times with our agent, Golder Associates,
and that it was clearly understood that once the "consistency" was established, the frequency
would be brought back to that approved in the specifications.
The summary of the permeability measurements made to date clearly show consistency and,
most importantly, show a much lower permeability than is required by the specification (10-6
cm/sec is required by the specifications). The range in tested permeabilities is from 1x10-9 to
8x10-9 cm/sec. Not a single measured permeability has been in the 106 cm/sec range -all have