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Golder Associates Inc. <br />44 Union Boulevard, Suite 300 <br />Lakewood, CO USA 80228 <br />Telephone (303) 980-0540 <br />Fax (303) 985-2080 <br />August 30, 2002 <br />Cripple Creek & Victor Gold Mining Company <br />P.O. Box 191 <br />2755 State Highway 67 <br />Victor, Colorado 80860 <br />Attention: Mr. Ron Roberts <br />RE: PHASE IVa WING WALL CONCRETE <br />Deaz Ron: <br />Golder <br />~AssociTtes <br />Our Ref: 003-2203 <br />RECEIVED <br />sEP z o zooz <br />Oiuision of Minerals aed Geology <br />Golder Associates Inc. (Golder) has prepazed this letter to address the recent failing air <br />entrainment test for concrete placed in the Phase IVa 42-inch CSP wing wall (down stream <br />wall.) The test in question was conducted on August 27, 2002 for the concrete being placed <br />to form the wing wall at the 42-inch CPS locations. The results of the air entrainment <br />indicated the concrete had an air content of 4.7 percent, which is slightly below the project <br />specifications of 5.0 percent. Only 3 cubic yards of concrete with low air entrainment was <br />placed in the wing wall. <br />Air entrainment in concrete is generally used to enhance workability of concrete and to <br />increase concrete durability. In Golder's opinion, the difference in air entrainment from <br />4.7 to 5.0 percent is not significant, and would not affect the concrete workability or <br />durability. Therefore, Golder will accept the low air entrained concrete in the 42-inch CSP <br />wing wall (down stream wall.) <br />Golder appreciates the ongoing opportunity to provide engineering services for the Cresson <br />Project. Please contact the undersigned with any questions. <br />Sincerely, <br />GOLDER ASSOCIATES INC. <br />John F. Lupo, Ph.D., P.E. <br />Sr. Project Manager <br />Permit #: ~ -~ Q~~~~ Confidental?: <br />Class: .-- Type-Seq.: <br />From: To: <br />Doc. Name s A t~~#~Dfi'1 Ani..t t t//e 1 <br />Doc. Date (if no date stamp) <br />JFL/dls <br />cc: Bob Nichols <br />1:\W122U3b I0%0 03-22 01 01 OO.OG>OBwwN828.AOc <br />OFFICES ACROSS ASIA, AUSTRALASIA, EUROPE, NORTH AMERICA. SOUTH AMERICA <br />