GENERAL49390

• Permit No: M1980244
• IBM Index Class Name: General Documents
• Doc Date: 5/30/1995
• Doc Name: ADVICE OF ADAPTION OF MATERIAL SPECIFICATION TO MEET SUPPLIER SPECIFICATION
• From: CRIPPLE CREEK & VICTOR GOLD MINING CO
• To: DMG
• Media Type: D
• Archive: No

• III IIIIIIIIIIIIIIII
999
~~ Cripple Creek & Victor Gold Mining Company
A Joint Venture -Pikes Peek Mining Company, Manager
~~[ 7 Operations Office Englewood Office
'~/ 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]
May 29, 1995
HAND DELIVERED
Mr. Berhan Keffelew
Environmental Protection Specialist
Colorado Department of Natural Resources
Division of Minerals and Geology
Office of Mined Land Reclamation
1313 Sherman Street, Room 215
Denver, Colorado 80203
RECEIVED
MAY 3 ~ 1995
Oiwslon of ~y~~nerais 1S Geology
Reference: Advice of Adaption of Material Specification to Meet Supplier Specification.
Dear Mr. Keffelew:
This letter is to advise the Office of Mined Land Reclamation of the approval by the Design
Engineer, Golder Associates, of an adaptation of one element of a material specification for the
80 mil Very Low Density Polyethylene liner material that is being supplied for construction in
1995. In ordering the remaining 80 mil VLDPE smooth liner for Phase I Cresson Pad and the
textured (one side) 80 mil VLDPE necessary to construct some of the Phase II underdrain, the
supplier able to provide the material in 1995, Poly-Flex, Inc., has an internal specification for
density that differs 0.5 percent from the original specification for the Cresson Project (0.930 v.
0.925 gms/cc). The attached letter from Golder Associates provides additional details.
The geosynthetic produced by Poly-Flex meets industry standards for VLDPE (NSF Standard
54) and its use does not adversely affect the design or operation of the facility. As Golder
Associates explains in their letter, the original specification was designed to coincide with the
Gundle manufacturing specifications, which, in the case of the limit on liner density, differ
slightly from the internal specifications of the 1995 manufacturer (Poly-Flex). All of the other
geosynthetic specifications for the Project are met by the Poly-Flex material. Golder's tests
demonstrated that the initial batch of materials were within a few thousands (0.002) of the
original specification of 0.925 gms/cc and therefore that they are in compliance with the 0.930
gms/cc "industry" standard.
Also included is a letter from Poly-Flex that confirms this information and confirms that the 10-
year warranty continues to apply for the material.
In keeping with our understanding of the outcome of the discussions between the Office of