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~LYl=1.EX II~~. III IIIIIIIIIIIIIIII <br />~ 2000 W. Marshall Drive Grand Prairie, Texas 75051 USA <br />800-527-3322 214-641-4374 FAX 214-988-8331 <br />May 10,1995 <br />Mr. Terry Manzdiak <br />Golder & associates <br />200 Union Blvd. Suite 500 <br />Lakewood, CO 80228 <br />~~cE~~~~ <br />MAY 151995 <br />GO~DER ASSOCIATE <br />Re: 80 mil VLDPE <br />Cripple Creek & Victor Gold Mine <br />Dear Mr. ~fanzdiak: <br />Per NSF Standard 54, VLDPE resin is defined as having a base density between .895 and <br />.915. The base resin of VLDPE sheet must be made up of resin that is in this density range. The <br />remaining portion must be made up of materials which are necessary for the performance of the <br />liner (such as carbon black, anti oxidants, etc.). The VLDPE sheet for Cripple Creek contains <br />approximately 2.5% carbon black and <.~°b anti oxidants. This meets the specifications for the <br />Cripple Creek project. <br />Union Carbide was the sole supplier of VLDPE resin being sold into the geomembrane <br />market. Union Carbide announced as of December 31, 1994 that VLDPE resin for the <br />geomembrane market would no longer be available. However, Poly-Flex was able to secure a <br />limited supply of VLDPE before production ceased. The density of this material was slightly <br />higher than what we had expected but was still within the specification range for VLDPE. <br />This resin, although slightly higher in density than previous VLDPE resins, was well within <br />NSF-54 standards. With the addition of carbon black, antioxidants, etc., the finished sheet density <br />can be as high as .928 for smooth and .930 for textured sheet, both well within industry standards <br />for VLDPE geomembrane. <br />Attached are the material certifications for the 80 mil smooth VLDPE geomembrane <br />produced for this project. Although some density values are greater than .925, other physical <br />properties exceed the project specifications. <br />The 80 mil VLDPE produced for this project will perform for the designed purpose. T•he <br />standard Poly-Flex, Inc. 10 yeaz pro-rata warranty will also be issued for this material. <br />Sincerely, n <br />,tf~fi/ <br />James Nobert <br />Lab Manager <br />