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i~ <br />Cripple Creek & Victor Gold Mining Company November 13, 2003 <br />Mr. Ron Roberts -4- 003-2203 <br />Previous analyses for the Phase N VLF were modeled with a friction angle of 18 degrees with zero <br />adhesion for the textwed geomembrane/soil liner fill interface, as outlined in Amendment 8; therefore <br />the samples with bentonite addition aze consistent with the design basis for the VLF. <br />Liner Load Testing <br />Geomembrane liner load testing was conducted on sample ALT-TP-11 amended with 3 percent <br />I ~ bentonite (by dry weight) in February 2003 under an applied pressure of 450 pounds per square inch <br />(psi) to simulate load under approximately 600 feet of ore. The liner load test report is included in <br />Appendix A. The clay liner material was compacted to 95 percent of the maximum dry density at <br />moisture content 3 percent below optimum. At the conclusion of the test, the liner was inspected and <br />tested for punctures both visually and by applying a vacuum (vacuum pressure of 70 mm Hg <br />[2.76 in Hg]). The liner load test passed both visual and vacuum inspections. <br />CONCLUSIONS AND RECOMMENDATIONS <br />Based on laboratory testing conducted on soil samples from the East Cresson Mine borrow source, <br />the soil can be used for construction of the Phase IV VLF based on the recommendations outlined in <br />the following table. <br />i <br /> <br /> <br />;J <br /> <br />Source Compaction = : Moisture , Bentonite <br />`' S eci£cat~on "- S ecification ;, ~ :Addition ` <br />East Cresson Mine Min. 95% -3 to +3% of +3% by dry <br />area ASTM D698 OMC~ wei t <br />OMC refers to the optimum moisture content. <br />It is important to note that the moisture specification of +/- 3 percent of the optimum moisture content <br />is different from the current compaction specification for SLF. <br />CLOSING <br />Thank you for the opportunity to work on this project. If you have any questions, or if we can be of <br />further assistance, please contact the undersigned at (303)980-0540. <br />Sincerely, <br /> GOLDER ASSOCIATES INC. <br />i John F. Lupo, Ph.D., P.E. <br /> Senior Project Manager <br /> JFL/dls <br /> <br /> <br />cw°tu°~w~ornm33um.o~oo.osa°~savroxs~.e'mc GoiderASSOCiates <br />