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Golder Assoclafes Inc. <br />44 Union Boulevard. Suite 300 <br />Lakewood, CO USA 80228 <br />Telephone (303) 980-0540 <br />Fax (303) 985-2080 <br />August 29, 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 />Our Ref: 003-2203 <br />RECEIVED <br />SEP 0 3 2002 <br />piyision of Minerals and Geology <br />Golder Associates Inc. (Golder) has prepared this letter to address the recent failing air <br />entrainment test for concrete placed in the Phase Na 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 yazds 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 />JFL/dls <br />cc: Bob Nichols <br />I1W~2203WI00\003-2203 0100.04838wwc0828 doc <br />OFFICES ACROSS ASIA, AUSTRALASIA. EUROPE. NORTH AMERICA. SOUTH AMERICA <br />