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LDIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Phone: (303) 866 -3567 <br />FAX• (303) 832 -8106 <br />June 28, 1993 <br />r Larry Perino <br />Aunnyside Gold Corporation <br />P.O. Box 177 <br />Silverton, CO 81433 <br />RE: <br />Brenneman Bulkhead Installation, <br />File No. M -77 -378 <br />P <br />Dear Mr. Perino: <br />The Division has reviewed SCG's request for partial approval of <br />Technical Revision TR -14 to proceed with installation of F -Level <br />and B -Level Brenneman Bulkheads. The information submitted is <br />sufficient to answer many of the concerns with bulkhead design <br />outlined in the Division's adequacy letter dated April 15, 1993. <br />Division staff concurs that an inspection of the locations proposed <br />for bulkhead installation is necessary to confirm the degree of <br />tunnel perimeter irregularity (which bears upon the ability of the <br />bulkheads to resist shear along the rock - concrete interface), and <br />the competency of the rock (in terms of the potential for failure <br />through the rock mass), as suggested in your June 4, 1993 <br />correspondence. I would like to tentatively schedule such an <br />inspection for thursday, July 29, 1993. We could also arrange to <br />inspect the site this week, thursday or friday, July 1 or 2, if you <br />prefer. Please contact me as soon as possible if you prefer the <br />earlier inspection. If site no problems are identified during site <br />inspection, the Division is prepared to grant the partial approval <br />you have requested. <br />The issue of financial assurance of long -term performance of the <br />bulkheads is still under consideration by Division staff, but it is <br />believed that resolution of this matter can be taken care of at the <br />time of final consideration of TR -14, and does not directly bear <br />upon the partial approval presently under consideration. <br />If you have any questions, please contact me. <br />Allen C. Sorenson <br />Reclamation Specialist <br />111 I 1 <br />STATE OF COLORADO <br />Technical Revision TR -14, <br />Roy Romer <br />Governor <br />Michael B Long <br />Division Director <br />