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SUNNYSIDE GOLD CORPORATION <br /> AN ECHO 8"COMPANY <br /> P.O. Box 177 .Silverton, CO 81433 <br /> Phone (303) 387-5533 .Telecopy (303) 387-5310 <br /> January 21 , 1994 <br /> Allen Sorenson, Reclamation Specialist24� <br /> D pa tment of Natural Resources -99q. <br /> ivision of Minerals and Geology <br /> 1313 Sherman Street, Room 215 <br /> Denver , Colorado 80203 <br /> RE: File No. M77�78 , TR-14 <br /> ,R=L Brenneman Secondary Bulkhead wall irregularity <br /> Dear Mr . Sorenson: <br /> The design assumption that enough perimeter area irregularity <br /> exists at each of the bulkhead sites to prevent bulkhead failure by <br /> thrust is to be confirmed prior to pouring of the bulkhead or a <br /> design for shear pins is to be submitted to the Division if the <br /> design assumption cannot be confirmed. Because of the relatively <br /> small irregularity (0 . 15" ) and quantity (100 of the perimeter area) <br /> of intact rock irregularities required, it would be very difficult <br /> to verify if a bulkhead site was marginal in respect to these <br /> design assumptions. The F-L Brenneman Secondary Bulkhead site is <br /> not marginal and could be verified by visual inspection although <br /> the attached x-sections, long sections and plan sections should <br /> provide adequate documentation to demonstrate that the design <br /> assumptions are valid. <br /> The x-sections show decreasing x-sectional area (see Table 1) <br /> except for the last section (air-side bulkhead) . This area is <br /> larger because it is at the end of a round and was selected as the <br /> site for the air-side bulkhead because it provides a natural local <br /> low to further wedge the bulkhead against thrust . <br /> TABLE 1 <br /> SECTION X-Sectional Area (sq. ft. ) Comment <br /> 0 + 9 . 3 73 . 72 Water-side <br /> 0 + 10. 0 70. 26 <br /> 0 + 11 . 0 65. 00 <br /> 0 + 12 . 0 64 . 64 <br /> 0 + 14 . 0 64. 56 <br /> 0 + 15. 0 63. 84 <br /> 0 + 16. 0 61 . 76 <br /> 0 + 17. 3 67. 74 Air-side <br />