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f'' ~' ~ ~ ~II ~I~~I~~II~~~~ ~I~ <br />sss <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanment of Natural Resources <br />1313 Sherman St., Room 215 <br /> <br />Denver, Colorado 80203 1I~~~ <br /> <br />Phone: (303) 866-3567 I <br />FAX: (303)872-8106 <br /> DEPARTMENT OI <br /> NATURAI <br />October 27, 1994 RESOURCE; <br /> <br />Mr. John Hardaway Roy Romer <br />Governor <br />Environmental Manager Tames S. LOChhead <br /> <br />Cripple Creek and Victor Gold Executive Director <br /> <br />P. O. BOX 191 Michael B. Long <br />Dlvlsion Director <br />Victor, CO 80860-0191 <br />RE: Specification Changes, Cripple Creek and ViMor Gold Company, <br />Cresson Project, FYIe No. M-80-244 <br />Dear Mr. Hardaway: <br />The Division of Minerals and Geology has reviewed your letter dated October 24, 1994 <br />which summarized the specification changes requested to date by Cripple Creek and <br />Victor Gold during the ongoing construction of the Cresson Valley Heap Leach Phase I <br />Project. The following specification changes 1-10 have been approved by the Division. <br />Specification change No. 11 is still awaiting test results before fmal approval is granted. <br />1. The use of material from the Gold Star Pit for leak detection. <br />2. Use of material at the Gold Star Pit as pipe bedding and pipe cover in the underdrain <br />system. <br />3. The change in gradation from 8 inches to 12 inches maximum for underdrain bedding. <br />4. Changes in Valley Leach underdrain configuration for the underdrain pipe trench in <br />upstream one-half of the Valley Leach facility. <br />5. Gradation specification modification of the soil liner from 'k inch minus 2 inch <br />minus. <br />6. Changes in gradation specification for finger drains which show no visible flow. <br />f~ h.r-- <br />7. Removal of stacking limit of stockpiled geotextile on site. /, -~ 1 a~ ~~ <br />8. Cold weather seaming, winter closure, and spring start up plans. 4 l~ t ~~ '~ ~~~p ~/ ~,,~ <br />~ 77 <br />9. Design modification of structural fill thickness from I to 3 feet for upstream face of /~/l~ <br />