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' <br /> Golder Associates Inc. <br />' 44 Union Boulevard, Suite 3C0 <br />Lakewood, CO USA 80228 <br /> Telephone (303) 980-0540 <br /> Fax (303) 985-2080 <br />t N <br />b <br />13 <br />2003 <br /> ovem <br />er <br />, <br /> Cripple Creek & Victor Gold Mining Company <br /> P.O. Box 191 <br /> 1280 State Highway 67 <br />' Victor, Colorado 80860 <br />' Attention: Mr. Ron Roberts <br /> RE: BENTONTTE AMENDED SLF <br /> <br /> Deaz Ron: <br />_ ~ =AAG^, old~~,e.^^~~~~~ <br />~ 1~-~~C~ <br />Our Ref: 003-2203 <br />' Golder Associates Inc. (Golder) has prepazed this letter for the Cripple Creek & Victor Gold Mining <br />Company (CC&V) presenting the results of the physical and hydraulic testing conducted on bentonite <br />amended Soil Liner Fill (SLF) soils from the East Cresson Mine (Altman Mine) azea. The purpose of <br />' this testing program was to define the level of bentonite amendment for the East Cresson Mine soils <br />to meet the requirements of the Phase IV Technical Specifications for SLF. <br />Based on laboratory testing conducted on soil samples from the East Cresson Mine SLF borrow <br />source, the soil can be used for construction of the Phase IV VLF based on the recommendafions <br />outlined in the following table. <br />y°~'i~`~~` - ~a~ aeBa`u "`"~11Mo>fstur`e " `~- <br />anree< ~~ -~-..„~ ~: ~~5. Benf6brt~dr 6n <br />~~ g.°.:~ _, ~~S ecr~a~ron~? S` ectfica onf ~. ~°. ~; -~~ <br />East Cresson Min. 95% -3 to +3% of OMC Y+3% by dry weight <br />Mine azea ASTM D698 <br />OMC refers to the optimum moisture content. <br />The following sections present the laboratory tests and test results for the East Cresson Mine SLF <br />soils. <br />TESTING PROGRAM <br />Soil samples from the East Cresson Mine SLF borrow source were sent to Golder's geotechnical <br />laboratory located in Lakewood, Colorado, for index, permeability, and liner load testing. Interface <br />sheaz testing was also conducted on select samples. These tests were conducted at Golder's <br />geotechnical [aboratory located in Atlanta, Georgia. The laboratory test program consisted of the <br />following: <br />• Sieve Analyses (ASTM C 136) - 12 tests; <br />• Atterbetg Limits (ASTM D4318) - 12 tests; <br />• Standazd Froctor Compaction (ASTM D698) - 7 tests; <br />OFFICES ACROSS ASIA. AUSTRALASIA, EUROPE, NORTH AMERICA, SOUTH AMERICA <br />