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~r <br />III IIIIIIIII IIII III <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanmem of Natural Resources <br />1313 Sherman SL, Roam 2I5 <br />Denver, Colorado 8U?03 <br />Phone: (3071 866-3567 <br />FAX: 13031832-8106 <br />DATE: May 2, 1996 <br />TO: Berhan Keffelew <br />FROM: Jim Pendleton <br />RE: Cripple ~k & V' or Gold Company <br />"Correc on eference to Testing Method" and <br />"Update on Assessment of Underground Workings" <br />(Permit No: M-80-244) <br />~~~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Ruy Rumer <br />Guvernar <br />lames 5. Lnchhead <br />EaeCUlive Director <br />Michael 8. Long <br />Division Dueaor <br />You forwarded a copy of a letter submitted for review by Cripple Creek & Victor Gold <br />(CC&VG), dated March 27, 1996, to my attention. This letter and the attached memoranda <br />addressed two topics: testing specification correction for LlDPE puncture resistance and <br />"Remediation of Underground Workings". Following are my review comments regarding both <br />items. In preparing these comments I have also discussed recent activities at the site with <br />you. <br />"LLDPE Puncture Resistance Specification" <br />Golder Associates discovered that the ASTM (American Society for Testing & Materials) <br />specification included within the permit revision document for verifying the puncture <br />resistance of geomembranes was incorrectly referenced. The reference included in the <br />application was a 1970 vintage specification, FTM 101 C -2065, Golder has correctly <br />identified the more contemporary standard testing method as (ASTM) D4833, last revised <br />in 1988. Golder has identified and submitted the text citations and tables which require <br />correction. I recommend acceptance of this correction. <br />"Remediation of Underground Workings" <br />Golder Associates has prepared, and CC&VG is requesting approval of, an alternative <br />treatment technique for the capping of the historic shafts. Golder had originally proposed, <br />and the Division approved, the placement of concrete slabs above the historic shafts. This <br />technique involves the placement of two layers of UX1700 HS geogrid fabric with opposed <br />bias to reinforce the subgrade beneath the soil liner fill and the geomembrane liner of <br />